/* style.css — Smart PDF Summarizer
   Liquid Glass: Warm translucent surfaces + gold luminance
   Typography: EB Garamond (headings) + Atkinson Hyperlegible (body)
*/

@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:wght@400;700&family=EB+Garamond:wght@400;500;600;700;800&display=swap');

/* ── Design Tokens ────────────────────────────────────────── */
:root {
  /* Surface — warm translucent glass layers */
  --bg:       #f6f3ec;     /* warm parchment base */
  --surf:     rgba(255,255,255,.72);   /* frosted glass card */
  --surf2:    rgba(244,242,238,.65);   /* secondary glass */
  --border:   rgba(213,209,201,.55);   /* glass edge */
  --border2:  rgba(195,190,181,.65);   /* stronger glass edge */

  /* Glass material tokens */
  --glass:        rgba(255,255,255,.55);
  --glass-thick:  rgba(255,255,255,.78);
  --glass-blur:   blur(16px) saturate(1.4);
  --glass-blur-heavy: blur(24px) saturate(1.6);

  /* Brand */
  --primary:  #171717;     /* near-black */
  --primary2: #2d2d2d;     /* dark gray */
  --gold:     #A16207;     /* warm gold accent */
  --gold-bg:  rgba(161,98,7,.07);
  --gold-border: rgba(161,98,7,.22);
  --gold-glow: rgba(161,98,7,.12);

  /* Semantic */
  --success:  #166534;
  --red:      #b91c1c;
  --red-bg:   rgba(185,28,28,.06);
  --red-border: rgba(185,28,28,.18);
  --amber:    #92400e;
  --amber-bg: rgba(146,64,14,.07);
  --amber-border: rgba(146,64,14,.16);

  /* Text */
  --text:     #1a1a1a;
  --muted:    #6b6156;
  --dim:      #b0a99d;

  /* Radius — fluid, organic */
  --r:        10px;
  --rs:       8px;
  --xl:       16px;

  /* Shadows — warm ambient glow */
  --shadow-sm: 0 2px 8px rgba(161,98,7,.05), 0 1px 3px rgba(0,0,0,.03);
  --shadow-md: 0 4px 16px rgba(161,98,7,.07), 0 2px 6px rgba(0,0,0,.03);
  --shadow-lg: 0 8px 32px rgba(161,98,7,.09), 0 4px 12px rgba(0,0,0,.04);
  --shadow-glow: 0 0 24px rgba(161,98,7,.12);

  --font-heading: 'EB Garamond', serif;
  --font-body: 'Atkinson Hyperlegible', 'Crimson Text', sans-serif;

  color-scheme: light;
}

/* Font size control button */
.font-size-btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 2px; min-width: auto; padding: 4px 8px;
}
.font-size-btn span { width: 14px; text-align: center; font-variant-numeric: tabular-nums; }

/* ── Dark Mode ────────────────────────────────────────────── */
[data-theme="dark"] {
  --bg:       #111010;
  --surf:     rgba(30,28,25,.78);      /* dark frosted glass */
  --surf2:    rgba(38,35,31,.7);       /* dark secondary glass */
  --border:   rgba(60,55,48,.5);
  --border2:  rgba(75,69,60,.55);

  /* Dark glass material */
  --glass:        rgba(30,28,25,.6);
  --glass-thick:  rgba(38,35,31,.82);
  --glass-blur:   blur(16px) saturate(1.3);
  --glass-blur-heavy: blur(24px) saturate(1.5);

  --primary:  #f0ede7;
  --primary2: #d5d1c9;
  --gold:     #d4a853;
  --gold-bg:  rgba(212,168,83,.09);
  --gold-border: rgba(212,168,83,.22);
  --gold-glow: rgba(212,168,83,.14);

  --success:  #4ade80;
  --red:      #f87171;
  --red-bg:   rgba(248,113,113,.08);
  --red-border: rgba(248,113,113,.15);
  --amber:    #fbbf24;
  --amber-bg: rgba(251,191,36,.08);
  --amber-border: rgba(251,191,36,.15);

  --text:     #f0ede7;
  --muted:    #93897b;
  --dim:      #5c5448;

  /* Dark ambient glow shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,.25), 0 1px 3px rgba(0,0,0,.15);
  --shadow-md: 0 4px 16px rgba(0,0,0,.35), 0 2px 6px rgba(0,0,0,.2);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.45), 0 4px 12px rgba(0,0,0,.25);
  --shadow-glow: 0 0 28px rgba(212,168,83,.1);

  color-scheme: dark;
}

/* dark body::before is handled above */

html { font-size: 18px; } /* default, overridden by JS font-size control */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.65;
}

/* Warm gradient mesh — light through frosted glass */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 20% 10%, rgba(161,98,7,.06) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(161,98,7,.04) 0%, transparent 45%),
    radial-gradient(ellipse 50% 60% at 50% 90%, rgba(161,98,7,.03) 0%, transparent 50%);
  pointer-events: none; z-index: 0;
}
[data-theme="dark"] body::before {
  background:
    radial-gradient(ellipse 70% 50% at 20% 10%, rgba(212,168,83,.05) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(100,80,180,.03) 0%, transparent 45%),
    radial-gradient(ellipse 50% 60% at 50% 90%, rgba(212,168,83,.02) 0%, transparent 50%);
  opacity: .8;
}

/* ── Layout ───────────────────────────────────────────────── */
.wrap { position: relative; z-index: 1; max-width: 680px; margin: 0 auto; padding: 36px 24px 96px; }
.wrap-sm { max-width: 520px; }

/* ── Top Navigation Bar ──────────────────────────────────── */
.control-bar {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  backdrop-filter: var(--glass-blur-heavy); -webkit-backdrop-filter: var(--glass-blur-heavy);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
  box-shadow: 0 1px 0 color-mix(in srgb, rgba(255,255,255,.3) 40%, transparent);
}
#control-bar-target { position: relative; }
.control-bar .nav-left {
  display: flex; align-items: center; gap: 24px;
}
.control-bar .nav-right {
  display: flex; align-items: center; gap: 10px;
}
.logo-link {
  font-family: var(--font-heading); font-size: 1.1rem; font-weight: 700;
  color: var(--text); text-decoration: none; display: flex; align-items: center; gap: 4px;
  white-space: nowrap;
}
.nav-links {
  display: flex; gap: 4px;
}
.nav-link {
  text-decoration: none; color: var(--muted);
  font: 500 .78rem/1 var(--font-body);
  padding: 6px 12px; border-radius: var(--rs);
  transition: all .2s cubic-bezier(.4,0,.2,1);
}
.nav-link:hover { color: var(--text); background: var(--gold-bg); box-shadow: 0 0 12px var(--gold-glow); }
.nav-link.active { color: var(--gold); font-weight: 600; }
.streak-badge {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: .72rem; font-weight: 700; color: var(--gold);
  padding: 4px 10px; border-radius: 99px;
  background: linear-gradient(135deg, rgba(161,98,7,.1), rgba(161,98,7,.04));
  border: 1px solid var(--gold-border);
  box-shadow: 0 0 12px var(--gold-glow);
}
[data-theme="dark"] .streak-badge {
  background: linear-gradient(135deg, rgba(212,168,83,.12), rgba(212,168,83,.05));
  box-shadow: 0 0 16px rgba(212,168,83,.12);
}
.icon-btn {
  width: 32px; height: 32px; border-radius: var(--rs);
  border: 1px solid var(--border); background: var(--glass);
  color: var(--muted); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: .78rem; font-family: var(--font-body); font-weight: 600;
  transition: all .2s cubic-bezier(.4,0,.2,1);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.icon-btn:hover { background: var(--gold-bg); border-color: var(--gold); color: var(--text); box-shadow: 0 0 12px var(--gold-glow); }
.icon-btn svg { width: 15px; height: 15px; flex-shrink: 0; }
.font-size-btn { font-size: .72rem; min-width: 32px; }

/* ── Hamburger toggle (mobile only) ─────────────────────── */
.nav-toggle {
  display: none; /* shown on mobile via media query */
  background: none; border: none; cursor: pointer;
  width: 44px; height: 44px; padding: 0;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
  border-radius: var(--rs); color: var(--text);
}
.nav-toggle span {
  display: block; width: 18px; height: 2px; background: currentColor;
  border-radius: 2px; transition: transform .25s ease, opacity .25s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile nav drawer ──────────────────────────────────── */
.mobile-nav {
  display: none; /* shown on mobile via media query */
  position: fixed; top: 48px; left: 0; right: 0;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: var(--glass-blur-heavy); -webkit-backdrop-filter: var(--glass-blur-heavy);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
  padding: 8px 16px 12px;
  transform: translateY(-8px); opacity: 0;
  transition: transform .25s cubic-bezier(.4,0,.2,1), opacity .25s ease;
  pointer-events: none;
  z-index: 99;
}
.mobile-nav.open {
  transform: translateY(0); opacity: 1; pointer-events: auto;
}
.mobile-nav .nav-link {
  display: block; padding: 12px 16px; font-size: .9rem;
  border-radius: var(--rs); min-height: 44px;
  display: flex; align-items: center;
}
.mobile-nav .nav-link:hover { background: var(--gold-bg); }
.mobile-nav .nav-link.active { color: var(--gold); font-weight: 600; }
.nav-backdrop {
  display: none; position: fixed; inset: 0; z-index: 98;
  background: rgba(0,0,0,.3);
  opacity: 0; pointer-events: none; transition: opacity .2s ease;
}
.nav-backdrop.open { opacity: 1; pointer-events: auto; }

/* ── Streak flame ───────────────────────────────────────────── */
.streak-flame {
  font-size: .78rem; font-weight: 700; color: var(--gold);
  margin-right: 8px; display: inline-flex; align-items: center; gap: 2px;
  cursor: default; user-select: none;
}

/* ── Search bar ─────────────────────────────────────────────── */
.search-bar {
  display: flex; align-items: center; gap: 8px;
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--r); padding: 8px 12px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.search-bar:focus-within {
  border-color: var(--gold);
  box-shadow: var(--shadow-md), 0 0 16px var(--gold-glow);
}
.search-bar svg { flex-shrink: 0; color: var(--muted); }
.search-input {
  flex: 1; border: none; background: transparent; outline: none;
  font-family: var(--font-body); font-size: .9rem; color: var(--text);
}
.search-input::placeholder { color: var(--dim); }
.search-clear {
  background: none; border: none; cursor: pointer; padding: 2px;
  color: var(--muted); display: flex; align-items: center;
  border-radius: 50%;
}
.search-clear:hover { color: var(--text); background: var(--surf2); }

/* ── Header ───────────────────────────────────────────────── */
header { text-align: center; margin-bottom: 52px; }
.logo {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem,5vw,3.2rem);
  font-weight: 700; line-height: 1.12;
  color: var(--primary); margin-bottom: 8px;
  letter-spacing: -.01em;
}
.logo-accent {
  color: var(--gold);
}
.subtitle {
  color: var(--muted); font-size: 1.02rem; max-width: 440px;
  margin: 0 auto; line-height: 1.6; font-style: italic;
}

/* ── Dividers ─────────────────────────────────────────────── */
.divider {
  border: none; border-top: 1px solid var(--border);
  margin: 32px 0; width: 100%;
}
.divider-thin { border-width: 0.5px; margin: 24px 0; }

/* ── Cards ────────────────────────────────────────────────── */
.card {
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--xl); padding: 36px;
  box-shadow: var(--shadow-sm); margin-bottom: 20px;
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  transition: border-color .25s cubic-bezier(.4,0,.2,1), box-shadow .25s cubic-bezier(.4,0,.2,1), transform .25s cubic-bezier(.4,0,.2,1);
}
.card:hover {
  box-shadow: var(--shadow-lg), 0 0 20px var(--gold-glow);
  transform: scale(1.005);
  border-color: color-mix(in srgb, var(--gold) 30%, var(--border));
}
.card:focus-within {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-bg), var(--shadow-md), 0 0 20px var(--gold-glow);
}

/* ── Forms ────────────────────────────────────────────────── */
.field { margin-bottom: 24px; }
.field label {
  display: block; font-size: .78rem; font-weight: 600;
  color: var(--text); margin-bottom: 6px;
  font-family: var(--font-body); text-transform: none;
  letter-spacing: 0;
}
.field input {
  width: 100%; background: var(--glass); border: 1px solid var(--border2);
  border-radius: var(--r); padding: 12px 14px; color: var(--text);
  font-family: var(--font-body); font-size: 1rem; outline: none;
  transition: border-color .2s ease, box-shadow .2s ease;
  min-height: 46px;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.field input::placeholder { color: var(--dim); }
.field input:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-bg), 0 0 16px var(--gold-glow);
}
.field-hint { font-size: .78rem; color: var(--muted); margin-top: 6px; font-style: italic; }
.field-hint a { color: var(--gold); text-decoration: underline; text-underline-offset: 2px; }

.field-error {
  font-size: .8rem; color: var(--red); margin-top: 6px; display: none;
  align-items: center; gap: 5px; font-weight: 500;
}
.field-error.show { display: flex; }

.password-wrap { position: relative; }
.password-wrap input { padding-right: 48px; }
.pw-toggle {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: var(--dim); cursor: pointer;
  padding: 8px; line-height: 0; border-radius: var(--rs); min-width: 44px; min-height: 44px;
  display: flex; align-items: center; justify-content: center;
  transition: color .2s ease, background .2s ease;
}
.pw-toggle:hover { color: var(--text); background: var(--glass); }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px; border-radius: var(--r); font-size: .92rem; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  font-family: var(--font-body); line-height: 1; min-height: 44px; min-width: 44px;
  text-decoration: none;
}
.btn:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; box-shadow: 0 0 0 4px var(--gold-bg), 0 0 16px var(--gold-glow); }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--primary); color: var(--surf);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--primary2); transform: translateY(-1px); box-shadow: var(--shadow-md), 0 0 16px rgba(0,0,0,.08); }
.btn-primary:active { transform: translateY(0) scale(0.97); }
.btn-primary:disabled { opacity: .35; pointer-events: none; }

.btn-accent {
  background: linear-gradient(135deg, var(--gold), color-mix(in srgb, var(--gold) 88%, #fff));
  color: #fff; font-weight: 600;
  box-shadow: var(--shadow-sm), 0 0 16px var(--gold-glow);
}
.btn-accent:hover { filter: brightness(1.08); transform: translateY(-1px); box-shadow: var(--shadow-md), 0 0 24px var(--gold-glow); }
.btn-accent:active { transform: translateY(0) scale(0.97); }
.btn-accent:disabled { opacity: .35; pointer-events: none; }

.btn-ghost {
  background: var(--glass); color: var(--text); border: 1px solid var(--border2);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.btn-ghost:hover { background: var(--gold-bg); border-color: var(--gold); box-shadow: 0 0 12px var(--gold-glow); }

.btn-danger {
  background: transparent; color: var(--red); border: 1px solid var(--red-border);
  font-weight: 500;
}
.btn-danger:hover { background: var(--red-bg); box-shadow: 0 0 12px rgba(185,28,28,.08); }

.btn-full { width: 100%; }
.btn-row { display: flex; gap: 10px; margin-top: 20px; }
.btn-row.between { justify-content: space-between; }
.btn-row.end { justify-content: flex-end; }

/* Button size variants (replace inline style overrides) */
.btn-sm { padding: 8px 14px; font-size: .82rem; }
.btn-xs { padding: 6px 14px; font-size: .78rem; }

/* Logo on inner pages (smaller than auth pages) */
.logo-sm { font-size: clamp(1.6rem, 3.5vw, 2.2rem); }

/* Submit button row spacing */
.submit-row { margin-top: 20px; }

/* Results action buttons row */
.res-actions { display: flex; gap: 8px; }

/* Flashcard hint text */
.fc-hint-text { font-size: .83rem; color: var(--muted); margin-bottom: 14px; font-style: italic; }

/* Form error with bottom margin */
.field-error-gap { margin-bottom: 12px; }

/* Hidden theme icon (replaces inline display:none) */
.theme-icon-hidden { display: none; }

/* ── PullCord theme toggle ───────────────────────────────── */
#theme-pullcord-mount {
  position: relative;
  /* The PullCord SVG is 64×340; we shrink it slightly so it fits the nav bar */
  width: 36px; height: 36px;
  overflow: visible;
  z-index: 50;
}
#theme-pullcord-mount > div {
  /* React root wrapper — make room for the full SVG to hang downward */
  position: absolute;
  top: -4px; right: -6px;
  width: 64px; height: 340px;
  overflow: visible;
  pointer-events: auto;
}
#theme-pullcord-mount .pullcord-knob {
  cursor: pointer;
}
/* Dark theme: lighter rope */
[data-theme="dark"] #theme-pullcord-mount {
  --pullcord-ink: rgba(200, 200, 200, 0.5);
}
/* Light theme: darker rope */
#theme-pullcord-mount {
  --pullcord-ink: rgba(80, 80, 80, 0.4);
}
#theme-pullcord-mount .pullcord {
  --pullcord-top: 2px;
  --pullcord-right: 1.5rem;
  --pullcord-z: 99;
}

/* ── PullCord core styles ───────────────────────────────── */
#theme-pullcord-mount .pullcord-inner {
  position: absolute;
  inset: 0;
}
#theme-pullcord-mount .pullcord-inner--drop {
  animation: pullcord-drop 0.6s 0.4s cubic-bezier(0.45, 0, 0.9, 0.5) both;
}
@keyframes pullcord-drop {
  0% { opacity: 0; transform: translateY(-230px); }
  20% { opacity: 1; }
  100% { transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  #theme-pullcord-mount .pullcord-inner--drop { animation: none; }
}
#theme-pullcord-mount .pullcord-knob {
  -webkit-tap-highlight-color: transparent;
  border-radius: 50%;
}
#theme-pullcord-mount .pullcord-knob:active {
  cursor: grabbing;
}
#theme-pullcord-mount .pullcord-knob:focus-visible {
  outline: 2px solid var(--pullcord-ink, rgba(127,127,127,0.6));
  outline-offset: -9px;
}

/* ── Links ─────────────────────────────────────────────────── */
.link { color: var(--gold); text-decoration: underline; text-underline-offset: 2px; font-weight: 500; }
.link:hover { color: var(--primary); }
.auth-switch { text-align: center; margin-top: 20px; font-size: .92rem; color: var(--muted); }

/* ── Drop Zone ────────────────────────────────────────────── */
#drop-zone {
  display: block;
  border: 2px dashed var(--border2); border-radius: var(--xl);
  padding: 52px 24px; text-align: center; cursor: pointer;
  transition: all .3s cubic-bezier(.4,0,.2,1);
  background: var(--glass);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  position: relative; overflow: hidden;
}
#drop-zone::before {
  content: ''; position: absolute; inset: -2px;
  background: conic-gradient(from 0deg, var(--gold), transparent 25%, var(--gold) 50%, transparent 75%, var(--gold));
  border-radius: var(--xl); opacity: 0; transition: opacity .5s; z-index: 0;
  pointer-events: none;
  animation: border-spin 6s linear infinite paused;
}
#drop-zone::after {
  content: ''; position: absolute; inset: 2px;
  background: var(--glass-thick); border-radius: calc(var(--xl) - 2px); z-index: 0;
  pointer-events: none;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
#drop-zone > * { position: relative; z-index: 1; }
#drop-zone:hover::before { opacity: .15; animation-play-state: running; }
#drop-zone:hover, #drop-zone.over {
  border-color: var(--gold); background: var(--gold-bg);
  box-shadow: 0 0 32px var(--gold-glow), inset 0 0 20px rgba(161,98,7,.04);
}
@keyframes border-spin {
  to { transform: rotate(360deg); }
}
.drop-icon {
  width: 72px; height: 72px; margin: 0 auto 20px;
  border-radius: var(--xl); display: flex; align-items: center; justify-content: center;
  color: var(--gold); transition: transform .4s ease, box-shadow .4s ease;
}
.drop-icon svg { width: 36px; height: 36px; }
#drop-zone:hover .drop-icon,
#drop-zone.over .drop-icon {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 0 16px color-mix(in srgb, var(--gold) 25%, transparent);
}
.drop-title { font-size: 1.15rem; font-weight: 600; margin-bottom: 6px; font-family: var(--font-heading); }
.drop-sub { font-size: .88rem; color: var(--muted); }

/* ── Cinematic Upload Layout ─────────────────────────────── */
.upload-hero {
  text-align: center; margin-bottom: 48px;
}
.upload-hero .logo { font-size: clamp(1.8rem, 4vw, 2.4rem); margin-bottom: 8px; }
.upload-hero .subtitle { margin-bottom: 32px; }
.upload-hero-card {
  max-width: 720px; margin: 0 auto;
}
.upload-hero-card #drop-zone {
  padding: 64px 32px;
}
.upload-hero-card #drop-zone .drop-icon {
  width: 80px; height: 80px;
}
.upload-hero-card #drop-zone .drop-icon svg { width: 40px; height: 40px; }

/* ── Floating Bottom Bar ─────────────────────────────────── */
.bottom-bar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 76%, transparent);
  backdrop-filter: var(--glass-blur-heavy); -webkit-backdrop-filter: var(--glass-blur-heavy);
  border-top: 1px solid color-mix(in srgb, var(--border) 45%, transparent);
  padding: 12px 24px; display: flex; align-items: center; gap: 16px;
  justify-content: center; flex-wrap: wrap;
  box-shadow: 0 -4px 24px color-mix(in srgb, var(--bg) 50%, transparent), 0 -1px 0 color-mix(in srgb, rgba(255,255,255,.2) 30%, transparent);
}
[data-theme="dark"] .bottom-bar {
  box-shadow: 0 -4px 24px rgba(0,0,0,.4);
}
.bar-group { display: flex; align-items: center; gap: 8px; }
.bar-label {
  font-size: .68rem; font-weight: 600; color: var(--muted);
  text-transform: uppercase; letter-spacing: .04em;
}
.bar-pills { display: flex; gap: 6px; }
.bar-pill {
  padding: 6px 14px; border-radius: 99px; font-size: .78rem; font-weight: 600;
  border: 1px solid var(--border2); background: var(--glass);
  color: var(--muted); cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  font-family: var(--font-body);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.bar-pill:hover { border-color: var(--gold); color: var(--text); box-shadow: 0 0 12px var(--gold-glow); }
.bar-pill.active { background: var(--gold); color: #fff; border-color: var(--gold); box-shadow: 0 0 16px var(--gold-glow); }
.bar-divider { width: 1px; height: 24px; background: var(--border); }
.bar-select {
  padding: 7px 12px; border-radius: var(--rs); font-size: .78rem;
  border: 1px solid var(--border2); background: var(--glass); color: var(--text);
  font-family: var(--font-body); outline: none; cursor: pointer;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: border-color .2s ease;
}
.bar-select:focus { border-color: var(--gold); box-shadow: 0 0 12px var(--gold-glow); }
.bar-btn {
  padding: 9px 22px; border-radius: 99px; font-size: .85rem; font-weight: 600;
  border: none; cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  font-family: var(--font-body);
}
.bar-btn-accent {
  background: linear-gradient(135deg, var(--gold), color-mix(in srgb, var(--gold) 88%, #fff));
  color: #fff;
  box-shadow: 0 2px 12px var(--gold-glow);
}
.bar-btn-accent:hover { filter: brightness(1.08); transform: scale(1.03); box-shadow: 0 4px 20px var(--gold-glow); }
.bar-btn-accent:disabled { opacity: .35; pointer-events: none; }

#file-input {
  position: absolute;
  width: 0; height: 0; opacity: 0; overflow: hidden;
}

/* ── File Chip ────────────────────────────────────────────── */
#file-chip {
  display: none; align-items: center; gap: 10px;
  background: linear-gradient(135deg, rgba(161,98,7,.08), rgba(161,98,7,.03));
  border: 1px solid var(--gold-border);
  border-radius: var(--r); padding: 10px 14px; margin-top: 14px; font-size: .88rem;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
#file-chip.show { display: flex; }
#file-chip svg { color: var(--gold); flex-shrink: 0; }
.fname { font-weight: 500; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.fname-display {
  font-weight: 500; cursor: text; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  padding: 2px 4px; border-radius: var(--rs); border: 1px solid transparent;
  transition: border-color .15s ease; display: block;
}
.fname-display:hover { border-color: var(--border2); }
.fname-input { font-family: var(--font-body); font-size: .88rem; font-weight: 500; width: 100%; }
.fsize { color: var(--muted); white-space: nowrap; }
#rm-file {
  background: none; border: none; color: var(--dim); cursor: pointer;
  border-radius: var(--rs); padding: 4px; line-height: 0; min-width: 44px; min-height: 44px;
  display: flex; align-items: center; justify-content: center;
}
#rm-file:hover { color: var(--red); }

/* ── Provider Toggle ──────────────────────────────────────── */
.provider-label {
  font-size: .78rem; font-weight: 600; color: var(--text); margin-bottom: 10px; display: block;
}
.provider-toggle { display: flex; gap: 10px; margin-bottom: 28px; }
.prov-btn {
  flex: 1; padding: 14px 16px; border-radius: var(--r);
  border: 1px solid var(--border2); background: var(--glass);
  cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1); text-align: center;
  font-family: var(--font-body);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.prov-btn .prov-name { font-size: .88rem; font-weight: 600; color: var(--text); display: block; }
.prov-btn .prov-sub { font-size: .72rem; color: var(--muted); display: block; margin-top: 2px; }
.prov-btn:hover { border-color: var(--gold); box-shadow: 0 0 16px var(--gold-glow); }
.prov-btn.active { border-color: var(--gold); background: var(--gold-bg); box-shadow: var(--shadow-sm), 0 0 16px var(--gold-glow); }
.prov-btn:disabled { opacity: .45; cursor: not-allowed; pointer-events: none; }

/* ── Provider Info & Warnings ──────────────────────────── */
.provider-info { margin-bottom: 20px; }
.provider-cap {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: .8rem; color: var(--muted); line-height: 1.4;
  padding: 8px 12px; background: var(--glass); border-radius: var(--rs);
  border: 1px solid var(--border);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.provider-cap svg { flex-shrink: 0; margin-top: 1px; }
.lang-warning {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: .8rem; color: var(--amber); line-height: 1.4;
  padding: 8px 12px; background: var(--amber-bg); border-radius: var(--rs);
  border: 1px solid var(--amber-border);
  margin-bottom: 20px;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.lang-warning svg { flex-shrink: 0; margin-top: 1px; }
.proxy-warning {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: .8rem; color: var(--muted); line-height: 1.4;
  padding: 8px 12px; background: var(--glass); border-radius: var(--rs);
  border: 1px solid var(--border);
  margin-bottom: 20px;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.proxy-warning svg { flex-shrink: 0; margin-top: 1px; }

/* ── Layout utilities (replace inline styles) ──────────── */
.text-center { text-align: center; }
.text-muted { color: var(--muted); }
.text-sm { font-size: .84rem; }
.text-xs { font-size: .78rem; }
.text-success { color: var(--success); }
.text-gold { color: var(--gold); }
.flex-row { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-xs { gap: 6px; }
.gap-sm { gap: 8px; }
.gap-md { gap: 10px; }
.gap-lg { gap: 14px; }
.gap-xl { gap: 20px; }
.mb-sm { margin-bottom: 8px; }
.mb-md { margin-bottom: 12px; }
.mb-lg { margin-bottom: 20px; }
.mb-xl { margin-bottom: 24px; }
.mb-2xl { margin-bottom: 32px; }
.mt-sm { margin-top: 8px; }
.mt-md { margin-top: 12px; }
.mt-lg { margin-top: 20px; }
.p-lg { padding: 48px; }
.p-md { padding: 32px; }
.heading-font { font-family: var(--font-heading); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.w-full { width: 100%; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ── Form Utilities ─────────────────────────────────────── */
.form-row { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.form-row-center { display: flex; gap: 10px; align-items: flex-end; }
.form-input {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--border2); border-radius: var(--rs);
  background: var(--glass); color: var(--text);
  font-family: var(--font-body); font-size: .88rem; outline: none;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.form-input:focus { border-color: var(--gold); box-shadow: 0 0 12px var(--gold-glow); }
.form-flex-1 { flex: 1; min-width: 180px; }
.form-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.form-actions-right { margin-top: 14px; text-align: right; }

/* ── Progress ─────────────────────────────────────────────── */
#prog-section { display: none; margin-bottom: 20px; }
#prog-section.show { display: block; }
.prog-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.prog-name { font-weight: 600; font-size: .95rem; }
.prog-pct { font-weight: 700; color: var(--gold); font-variant-numeric: tabular-nums; }
.bar-track {
  height: 4px; background: var(--glass); border-radius: 99px; overflow: hidden; margin-bottom: 12px;
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
}
.bar-fill {
  height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--gold) 0%, color-mix(in srgb, var(--gold) 70%, #fff) 50%, var(--gold) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.8s ease-in-out infinite;
  transition: width .45s cubic-bezier(.4,0,.2,1); width: 0%;
  box-shadow: 0 0 8px var(--gold-glow);
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.prog-msg { font-size: .86rem; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.spinner {
  width: 14px; height: 14px; border: 2px solid var(--border2);
  border-top-color: var(--gold); border-radius: 50%;
  animation: spin .7s linear infinite; flex-shrink: 0;
  filter: drop-shadow(0 0 4px var(--gold-glow));
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Phase pipeline ────────────────────────────────────────── */
.phase-pipeline {
  display: flex; align-items: center; justify-content: center;
  gap: 0; margin: 22px 0 18px; flex-wrap: wrap;
}
.phase-step {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  opacity: .38; transition: opacity .35s;
}
.phase-step.active { opacity: 1; }
.phase-step.done  { opacity: .85; }
.phase-dot {
  width: 34px; height: 34px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  border: 2px solid var(--border2);
  background: var(--glass);
  color: var(--muted);
  transition: all .4s cubic-bezier(.4,0,.2,1);
  position: relative;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.phase-step.active .phase-dot {
  border-color: var(--gold);
  box-shadow: 0 0 12px var(--gold-glow), 0 0 24px rgba(161,98,7,.08);
  animation: pulse-dot 2s ease-in-out infinite;
}
.phase-step.done .phase-dot {
  border-color: var(--gold);
  background: linear-gradient(135deg, var(--gold), color-mix(in srgb, var(--gold) 85%, #fff));
  color: #fff;
  box-shadow: 0 0 12px var(--gold-glow);
}
@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 6px color-mix(in srgb, var(--gold) 30%, transparent); }
  50%      { box-shadow: 0 0 16px color-mix(in srgb, var(--gold) 55%, transparent); }
}
.phase-dot svg { width: 15px; height: 15px; }
.phase-label {
  font-size: .72rem; font-weight: 500; color: var(--muted);
  white-space: nowrap;
}
.phase-line {
  width: 28px; height: 1.5px;
  background: var(--border2);
  margin: 0 6px 20px;
  transition: background .5s;
}
.phase-line.done { background: var(--gold); }

/* ── Processing skeleton preview ───────────────────────────── */
.processing-skeleton {
  margin-top: 18px;
}
.processing-skeleton .skeleton-card {
  padding: 20px 24px;
}
.processing-skeleton .skeleton-pills {
  display: flex; gap: 10px; margin-bottom: 22px;
}
.processing-skeleton .skeleton-pills .skeleton-pill {
  height: 26px; width: 80px; border-radius: 99px;
}
.skeleton-label {
  text-align: center; font-size: .82rem; color: var(--muted);
  margin-top: 12px;
  animation: fade-pulse 3s ease-in-out infinite;
  text-shadow: 0 0 12px var(--gold-glow);
}
@keyframes fade-pulse {
  0%, 100% { opacity: 0.5; }
  50%      { opacity: 1; }
}

/* ── Error ────────────────────────────────────────────────── */
#err-box {
  display: none; align-items: flex-start; gap: 10px;
  padding: 16px 20px; color: var(--red); font-size: .88rem;
  margin-bottom: 20px; border-left: 3px solid var(--red);
  background: var(--red-bg); border-radius: 0 var(--r) var(--r) 0;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
#err-box.show { display: flex; }
#err-box svg { flex-shrink: 0; margin-top: 1px; }

/* ── Results ──────────────────────────────────────────────── */
#results { display: none; }
#results.show { display: block; }
.res-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; flex-wrap: wrap; gap: 12px;
  padding-bottom: 16px; border-bottom: 1px solid var(--border);
}
.res-title { font-family: var(--font-heading); font-size: 1.3rem; font-weight: 600; display: flex; align-items: center; gap: 10px; }
.dot-ok {
  width: 8px; height: 8px; background: var(--success); border-radius: 50%;
}
.provider-badge {
  font-size: .68rem; font-weight: 600; letter-spacing: .03em;
  padding: 2px 8px; border-radius: 99px; margin-left: 4px;
  background: var(--gold-bg); color: var(--gold); border: 1px solid var(--gold-border);
  box-shadow: 0 0 8px var(--gold-glow);
}

/* Stats */
.stats {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 28px;
}
.stat {
  border: 1px solid var(--border); border-radius: 99px;
  padding: 4px 12px; font-size: .78rem; color: var(--muted);
  display: flex; align-items: center; gap: 4px;
  background: var(--glass);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.stat strong { color: var(--text); font-weight: 600; }

/* Tabs */
.tabs {
  display: flex; gap: 0; margin-bottom: 0;
  border-bottom: 2px solid var(--border);
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  mask-image: linear-gradient(to right, transparent 0, #000 24px, #000 calc(100% - 24px), transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0, #000 24px, #000 calc(100% - 24px), transparent 100%);
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  padding: 10px 20px; border: none; background: none;
  color: var(--muted); font-size: .88rem; font-weight: 500; cursor: pointer;
  transition: all .15s ease; font-family: var(--font-body);
  border-bottom: 2px solid transparent; margin-bottom: -2px;
}
.tab.on {
  color: var(--text); border-bottom-color: var(--gold);
  font-weight: 600;
}
.tab:hover:not(.on) { color: var(--text); background: var(--gold-bg); border-radius: var(--rs) var(--rs) 0 0; box-shadow: 0 -2px 8px var(--gold-glow); }
.panel {
  display: none; padding-top: 24px;
  animation: fadeInUp .35s cubic-bezier(.4,0,.2,1) both;
}
.panel.on { display: block; }

/* Markdown content */
.md {
  line-height: 1.75; font-size: 1rem;
  max-width: 70ch;
}
@media (max-width: 480px) { .md { max-width: 100%; } }
.md h2, .md h3 { margin: 24px 0 10px; color: var(--text); font-family: var(--font-heading); font-weight: 600; }
.md h2 { font-size: 1.3rem; }
.md h3 { font-size: 1.1rem; }
.md h2:first-child, .md h3:first-child { margin-top: 0; }
.md ul, .md ol { padding-left: 1.4rem; }
.md li { margin: 4px 0; }
.md strong { color: var(--primary); }
.md em { color: var(--muted); }
.md p { margin: 8px 0; }
.md hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }
.md blockquote {
  border-left: 3px solid var(--gold); padding-left: 14px;
  color: var(--muted); font-size: .88rem; margin: 12px 0; font-style: italic;
}

/* Flashcards — 3D flip (CSS Grid stacking — auto-sizes to tallest face) */
.fc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.fc {
  perspective: 800px; cursor: pointer;
}
.fc-inner {
  display: grid;
  grid-template-areas: "stack";
  transition: transform .5s cubic-bezier(.4,.2,.2,1);
  transform-style: preserve-3d;
}
.fc-inner > * {
  grid-area: stack;
  min-height: 140px;
}
.fc.flipped .fc-inner { transform: rotateY(180deg); }
.fc-front, .fc-back {
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--r); padding: 20px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  display: flex; flex-direction: column;
  transition: border-color .25s cubic-bezier(.4,0,.2,1), box-shadow .25s cubic-bezier(.4,0,.2,1);
}
.fc:hover .fc-front, .fc:hover .fc-back {
  border-color: var(--gold); box-shadow: var(--shadow-md), 0 0 20px var(--gold-glow);
}
.fc-back {
  transform: rotateY(180deg);
  border-color: var(--border2);
}
.fc .lbl {
  font-size: .66rem; font-weight: 600; letter-spacing: .03em;
  text-transform: uppercase; color: var(--gold); margin-bottom: 8px;
}
.fc.flipped .lbl { color: var(--success); }
.fc .q { font-size: .9rem; font-weight: 500; line-height: 1.55; flex: 1; }
.fc .a { font-size: .9rem; color: var(--success); line-height: 1.55; font-weight: 500; flex: 1; }
.fc-hint {
  font-size: .66rem; color: var(--dim); font-style: italic;
  margin-top: 8px; text-align: right;
}

/* ── Library (document list) ──────────────────────────────── */
.doc-list { display: flex; flex-direction: column; gap: 8px; }
.doc-item {
  display: flex; align-items: center; gap: 14px;
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--r); padding: 16px 18px;
  cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1); text-decoration: none;
  color: var(--text); box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.doc-item:hover { border-color: var(--gold); transform: translateX(3px); box-shadow: var(--shadow-md), 0 0 16px var(--gold-glow); }
.doc-icon {
  width: 38px; height: 38px; border-radius: var(--rs); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--glass);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.doc-icon.done { color: var(--success); background: rgba(22,101,52,.08); }
.doc-icon.proc { color: var(--amber); background: var(--amber-bg); }
.doc-info { flex: 1; min-width: 0; }
.doc-name { font-weight: 600; font-size: .92rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; cursor: text; display: inline-block; max-width: 100%; border-radius: var(--rs); padding: 1px 4px; border: 1px solid transparent; transition: border-color .15s ease; }
.doc-name:hover { border-color: var(--border2); }
.doc-meta { font-size: .78rem; color: var(--muted); margin-top: 2px; }
.doc-status {
  font-size: .68rem; font-weight: 600; padding: 3px 10px; border-radius: 99px;
  letter-spacing: .03em; flex-shrink: 0;
}
.doc-status.done { background: rgba(22,101,52,.08); color: var(--success); border: 1px solid rgba(22,101,52,.18); }
.doc-status.processing { background: var(--amber-bg); color: var(--amber); border: 1px solid var(--amber-border); box-shadow: 0 0 8px rgba(146,64,14,.08); }
.doc-status.error { background: var(--red-bg); color: var(--red); border: 1px solid var(--red-border); }

.empty-state {
  text-align: center; padding: 72px 20px; color: var(--muted);
  animation: fadeInUp .5s cubic-bezier(.4,0,.2,1) both;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 40vh;
}
.empty-state svg {
  width: 56px; height: 56px; margin-bottom: 16px; color: var(--dim);
  animation: float 3s ease-in-out infinite;
}
.empty-state h3 { font-family: var(--font-heading); font-size: 1.2rem; color: var(--text); margin-bottom: 8px; }
.empty-state p { font-size: .92rem; margin-bottom: 20px; }

/* ── Library Card Grid ────────────────────────────────────── */
.doc-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px;
}
.doc-card {
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--xl); overflow: hidden;
  cursor: pointer; transition: all .25s cubic-bezier(.4,0,.2,1);
  box-shadow: var(--shadow-sm);
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
}
.doc-card:hover {
  border-color: var(--gold); transform: translateY(-3px);
  box-shadow: var(--shadow-lg), 0 0 24px var(--gold-glow);
}
.doc-card .card-thumb {
  height: 88px; background: linear-gradient(135deg, var(--glass), color-mix(in srgb, var(--glass) 70%, var(--bg)));
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
.doc-card .card-thumb svg { width: 28px; height: 28px; color: var(--dim); opacity: .5; }
.doc-card .card-thumb.proc-thumb { background: linear-gradient(135deg, rgba(146,64,14,.07), rgba(251,191,36,.09)); }
.doc-card .card-thumb.err-thumb { background: linear-gradient(135deg, rgba(185,28,28,.07), rgba(239,68,68,.09)); }
.doc-card .card-body { padding: 14px 16px 12px; }
.doc-card .card-title {
  font: 500 .88rem/1.3 var(--font-body); margin-bottom: 8px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  color: var(--text);
}
.doc-card .card-meta {
  display: flex; align-items: center; gap: 8px;
}
.doc-card .provider-icon {
  width: 18px; height: 18px; border-radius: 4px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700;
}
.doc-card .provider-icon.claude { background: rgba(124,58,237,.1); color: #7c3aed; }
.doc-card .provider-icon.gemini { background: rgba(37,99,235,.1); color: #2563eb; }
[data-theme="dark"] .doc-card .provider-icon.claude { background: rgba(167,139,250,.12); color: #a78bfa; }
[data-theme="dark"] .doc-card .provider-icon.gemini { background: rgba(96,165,250,.12); color: #60a5fa; }
.doc-card .card-footer {
  padding: 10px 16px; border-top: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
  display: flex; align-items: center; justify-content: space-between;
  background: color-mix(in srgb, var(--glass) 40%, transparent);
}
.doc-card .card-footer .doc-status {
  font-size: .66rem; font-weight: 600; padding: 3px 10px; border-radius: 99px;
  letter-spacing: .03em;
}
.doc-card .card-actions {
  display: flex; gap: 4px; opacity: 0; transition: opacity .15s ease;
}
.doc-card:hover .card-actions { opacity: 1; }
.doc-card .card-actions button {
  background: none; border: none; color: var(--dim); cursor: pointer;
  padding: 4px 6px; border-radius: var(--rs); transition: all .15s ease;
  display: flex; align-items: center; justify-content: center;
  min-width: 28px; min-height: 28px;
}
.doc-card .card-actions button:hover { color: var(--red); background: var(--red-bg); }

/* ── Top Bar ──────────────────────────────────────────────── */
.top-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 36px; gap: 12px; flex-wrap: wrap;
  padding-bottom: 16px; border-bottom: 1px solid var(--border);
}
.top-bar .user-info { display: flex; align-items: center; gap: 10px; }
.top-bar .user-email { font-size: .84rem; color: var(--muted); max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ── Results entrance ─────────────────────────────────────── */
#results.show { animation: fadeInUp .5s cubic-bezier(.4,0,.2,1) both; }

/* ── Footer ───────────────────────────────────────────────── */
footer { text-align: center; margin-top: 72px; color: var(--dim); font-size: .78rem; font-style: italic; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); }

/* ── Skeleton loading ─────────────────────────────────────── */
.skeleton {
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--glass) 60%, transparent) 0%,
    color-mix(in srgb, var(--gold-glow) 30%, var(--glass)) 40%,
    color-mix(in srgb, var(--glass) 60%, transparent) 80%
  );
  background-size: 300% 100%;
  animation: glass-pulse 1.8s ease-in-out infinite;
  border-radius: var(--rs);
  position: relative;
  overflow: hidden;
}
.skeleton::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.12), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.8s ease-in-out infinite;
}
@keyframes glass-pulse {
  0%, 100% { opacity: .55; }
  50% { opacity: .85; }
}
.skeleton-card {
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--xl); padding: 24px; margin-bottom: 12px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.skeleton-line { height: 14px; margin-bottom: 10px; border-radius: 4px; }
.skeleton-line.w-60 { width: 60%; }
.skeleton-line.w-80 { width: 80%; }
.skeleton-line.w-40 { width: 40%; }
.skeleton-line.h-8 { height: 8px; margin-top: 16px; }
.skeleton-line.title { height: 20px; margin-bottom: 16px; }
.skeleton-pills { margin-bottom: 20px; }
.skeleton-pill { height: 24px; width: 72px; border-radius: 99px; }

/* Skeleton internals (replace inline styles) */
.skeleton-row { display: flex; align-items: center; gap: 14px; }
.skeleton-icon { width: 38px; height: 38px; border-radius: var(--rs); }
.skeleton-body { flex: 1; }

/* Doc item disabled state (replaces inline pointer-events:none) */
.doc-item.disabled { pointer-events: none; opacity: .7; }
.doc-item .spinner { flex-shrink: 0; margin-left: 4px; }

.doc-delete-btn {
  background: none; border: none; color: var(--dim); cursor: pointer;
  padding: 6px; border-radius: var(--rs); flex-shrink: 0;
  margin-left: 0; opacity: .5; transition: opacity .15s ease, color .15s ease;
  display: flex; align-items: center; justify-content: center;
  min-width: 32px; min-height: 32px;
}
.doc-item:hover .doc-delete-btn { opacity: 1; }
.doc-delete-btn:hover { color: var(--red); background: var(--red-bg); opacity: 1; }
.doc-delete-btn:focus-visible { opacity: 1; outline: 2px solid var(--gold); outline-offset: 2px; }

/* ── Keyframe animations ──────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 12px var(--gold-glow); }
  50% { box-shadow: 0 0 24px var(--gold-glow), 0 0 48px rgba(161,98,7,.06); }
}
/* ── Document list stagger ────────────────────────────────── */
.doc-item {
  animation: fadeInUp .4s cubic-bezier(.4,0,.2,1) both;
}
.doc-card {
  animation: fadeInUp .4s cubic-bezier(.4,0,.2,1) both;
}

/* ── Focus-visible (all interactive elements) ─────────────── */
.doc-item:focus-visible,
.prov-btn:focus-visible,
.tab:focus-visible,
.fc:focus-visible,
.search-clear:focus-visible,
.icon-btn:focus-visible,
.subject-pill:focus-visible,
.color-opt:focus-visible,
.bar-pill:focus-visible,
.bar-select:focus-visible,
.room-card:focus-visible,
.room-card-delete:focus-visible,
.share-picker-item:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--gold-bg), 0 0 16px var(--gold-glow);
}

/* ── Toast notifications ──────────────────────────────────── */
.toast-container {
  position: fixed; bottom: 24px; right: 24px; z-index: 200;
  display: flex; flex-direction: column; gap: 10px;
  max-width: 380px; pointer-events: none;
}
@media (max-width: 600px) { .toast-container { bottom: calc(env(safe-area-inset-bottom) + 80px); } }
@media (hover: none) { .toast-container { bottom: calc(env(safe-area-inset-bottom) + 80px); } }
.toast {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 14px 18px; border-radius: var(--r);
  border: 1px solid var(--border2);
  background: var(--glass-thick); color: var(--text);
  font-size: .88rem; font-family: var(--font-body);
  box-shadow: var(--shadow-lg);
  backdrop-filter: var(--glass-blur-heavy); -webkit-backdrop-filter: var(--glass-blur-heavy);
  cursor: pointer; pointer-events: auto;
  opacity: 0; transform: translateY(12px) scale(.97);
  transition: opacity .3s cubic-bezier(.4,0,.2,1), transform .3s cubic-bezier(.4,0,.2,1);
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast svg { flex-shrink: 0; margin-top: 2px; }
.toast-error { border-left: 3px solid var(--red); }
.toast-error svg { color: var(--red); }
.toast-success { border-left: 3px solid var(--success); }
.toast-success svg { color: var(--success); }
.toast-info { border-left: 3px solid var(--gold); }
.toast-info svg { color: var(--gold); }

/* ── Confirm dialog ───────────────────────────────────────── */
.confirm-overlay {
  position: fixed; inset: 0; z-index: 300;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.35);
  backdrop-filter: blur(16px) saturate(1.2); -webkit-backdrop-filter: blur(16px) saturate(1.2);
  opacity: 0; transition: opacity .3s ease;
}
.confirm-overlay.show { opacity: 1; }
.confirm-card {
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--xl); padding: 32px;
  max-width: 380px; width: calc(100% - 32px);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(0,0,0,.1);
  backdrop-filter: var(--glass-blur-heavy); -webkit-backdrop-filter: var(--glass-blur-heavy);
  transform: scale(.94) translateY(8px); transition: transform .3s cubic-bezier(.34,1.56,.64,1);
}
.confirm-overlay.show .confirm-card { transform: scale(1); }
.confirm-msg { font-size: .95rem; color: var(--text); margin-bottom: 24px; line-height: 1.6; }
.confirm-btns { display: flex; gap: 10px; justify-content: flex-end; }

/* ── Download button in panels ────────────────────────────── */
.panel-download {
  text-align: right; margin-bottom: 12px;
}

/* ── Subject badges ─────────────────────────────────────── */
.subject-badge {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: .68rem; font-weight: 600; padding: 2px 8px;
  border-radius: 99px; letter-spacing: .02em;
  border: 1px solid transparent;
  background: var(--glass);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.subject-badge .subject-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
/* Subject row dot — used in subject list rows */
.subject-list .subject-dot {
  width: 14px; height: 14px; border-radius: 50%; flex-shrink: 0;
}

/* Subject filter bar */
.subject-filter {
  display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px;
}
.subject-pill {
  padding: 5px 12px; border-radius: 99px; font-size: .78rem; font-weight: 500;
  border: 1px solid var(--border2); background: var(--glass);
  color: var(--muted); cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  font-family: var(--font-body); white-space: nowrap;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.subject-pill { border-color: var(--border2); }
.subject-pill:hover { border-color: var(--pill-color, var(--gold)); background: color-mix(in srgb, var(--pill-color, var(--gold)) 8%, transparent); color: var(--text); }
.subject-pill.active { border-color: var(--pill-color, var(--gold)); background: color-mix(in srgb, var(--pill-color, var(--gold)) 12%, transparent); color: var(--text); font-weight: 600; }
.subject-pill .pill-count {
  font-size: .66rem; color: var(--dim); margin-left: 2px;
}

/* Subject management */
.subject-list { display: flex; flex-direction: column; gap: 8px; }
.subject-row {
  display: flex; align-items: center; gap: 12px;
  background: var(--glass-thick); border: 1px solid var(--border);
  border-left: 4px solid var(--row-color, var(--border));
  border-radius: var(--r); padding: 12px 16px;
  transition: all .2s cubic-bezier(.4,0,.2,1);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.subject-row:hover {
  background: color-mix(in srgb, var(--row-color, var(--gold)) 10%, var(--glass-thick));
  border-color: color-mix(in srgb, var(--row-color, var(--gold)) 35%, var(--border));
  transform: translateX(3px);
  box-shadow: 0 0 16px color-mix(in srgb, var(--row-color, var(--gold)) 15%, transparent);
}
.subject-row .subject-name { flex: 1; font-weight: 500; font-size: .92rem; }
.subject-row .subject-actions { display: flex; gap: 6px; }

/* Color picker */
.color-options { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.color-opt {
  width: 28px; height: 28px; border-radius: 50%; cursor: pointer;
  border: 2px solid transparent; transition: all .2s cubic-bezier(.4,0,.2,1);
}
.color-opt:hover { transform: scale(1.15); box-shadow: 0 0 12px rgba(0,0,0,.1); }
.color-opt.active { border-color: var(--text); box-shadow: 0 0 0 3px var(--glass-thick), 0 0 12px rgba(0,0,0,.08); }

/* ── Quiz ───────────────────────────────────────────────── */
.quiz-score {
  font-family: var(--font-heading); font-size: 1.3rem; font-weight: 700;
  color: var(--gold); margin-bottom: 20px; text-align: center;
  padding: 12px; background: var(--gold-bg); border-radius: var(--r);
  border: 1px solid var(--gold-border);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 0 16px var(--gold-glow);
}
.quiz-score.quiz-complete {
  background: rgba(22,101,52,.08); color: var(--success); border-color: rgba(22,101,52,.18);
  box-shadow: 0 0 12px rgba(22,101,52,.08);
}
.quiz-card {
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--r); padding: 20px; margin-bottom: 14px;
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  transition: border-color .25s cubic-bezier(.4,0,.2,1);
}
.quiz-q {
  font-weight: 600; font-size: .95rem; margin-bottom: 14px; line-height: 1.5;
}
.quiz-options { display: flex; flex-direction: column; gap: 6px; }
.quiz-opt {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: var(--rs);
  border: 1px solid var(--border2); background: var(--glass);
  cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  font-family: var(--font-body); font-size: .88rem; text-align: left; width: 100%;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.quiz-opt:hover:not(.correct):not(.wrong) { border-color: var(--gold); background: var(--gold-bg); box-shadow: 0 0 12px var(--gold-glow); }
.quiz-opt-letter {
  width: 24px; height: 24px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .72rem; background: var(--glass);
  border: 1px solid var(--border2); flex-shrink: 0;
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.quiz-opt.correct {
  border-color: var(--success); background: rgba(22,101,52,.06);
}
.quiz-opt.correct .quiz-opt-letter { background: var(--success); color: #fff; border-color: var(--success); }
.quiz-opt.wrong {
  border-color: var(--red); background: var(--red-bg);
}
.quiz-opt.wrong .quiz-opt-letter { background: var(--red); color: #fff; border-color: var(--red); }
.quiz-explanation {
  margin-top: 10px; padding: 10px 14px; font-size: .84rem; color: var(--muted);
  background: var(--glass); border-radius: var(--rs); font-style: italic;
  border-left: 3px solid var(--gold);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}

/* ── SRS Review ─────────────────────────────────────────── */
.review-progress {
  text-align: center; margin-bottom: 20px;
  font-size: .88rem; color: var(--muted);
}
.review-progress-bar {
  height: 4px; background: var(--glass); border-radius: 99px;
  overflow: hidden; margin-top: 8px;
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
}
.review-progress-fill {
  height: 100%; background: var(--gold); border-radius: 99px;
  transition: width .3s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 0 8px var(--gold-glow);
}
.review-card {
  perspective: 800px; cursor: pointer; margin-bottom: 20px;
}
.review-card .fc-inner {
  display: grid; grid-template-areas: "stack";
  transition: transform .5s cubic-bezier(.4,.2,.2,1);
  transform-style: preserve-3d; min-height: 200px;
}
.review-card .fc-inner > * { grid-area: stack; }
.review-card.flipped .fc-inner { transform: rotateY(180deg); }
.review-card .fc-front, .review-card .fc-back {
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--r); padding: 24px;
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center;
}
.review-card .fc-back { transform: rotateY(180deg); }
.review-rating {
  display: flex; gap: 8px; justify-content: center; margin-top: 16px;
}
.review-rating .btn { min-width: 80px; }

/* ── Chat ───────────────────────────────────────────────── */
.chat-container { display: flex; flex-direction: column; height: 400px; max-height: 50vh; }
.chat-messages {
  flex: 1; overflow-y: auto; padding: 16px;
  display: flex; flex-direction: column; gap: 10px;
}
.chat-msg { display: flex; }
.chat-msg.chat-user { justify-content: flex-end; }
.chat-msg.chat-assistant { justify-content: flex-start; }
.chat-bubble {
  max-width: 80%; padding: 10px 14px; border-radius: var(--r);
  font-size: .88rem; line-height: 1.5;
}
.chat-user .chat-bubble {
  background: linear-gradient(135deg, var(--gold), color-mix(in srgb, var(--gold) 85%, #fff));
  color: #fff;
  border-bottom-right-radius: 2px;
  box-shadow: 0 2px 12px var(--gold-glow);
}
.chat-assistant .chat-bubble {
  background: var(--glass); color: var(--text);
  border: 1px solid var(--border);
  border-bottom-left-radius: 2px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.chat-empty {
  text-align: center; color: var(--muted); padding: 40px 20px;
}
.chat-empty p { margin-bottom: 8px; }
.chat-empty-hint { font-size: .82rem; font-style: italic; }
.chat-input-wrap {
  display: flex; gap: 8px; padding: 12px 16px;
  border-top: 1px solid var(--border); background: var(--glass);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.chat-input {
  flex: 1; padding: 10px 14px; border: 1px solid var(--border2);
  border-radius: var(--rs); font-family: var(--font-body); font-size: .88rem;
  background: var(--glass); color: var(--text); outline: none;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.chat-input:focus { border-color: var(--gold); box-shadow: 0 0 12px var(--gold-glow); }
.chat-typing-indicator .chat-bubble {
  display: flex; align-items: center; gap: 8px;
}
.chat-typing-indicator .spinner {
  width: 12px; height: 12px; border: 2px solid var(--border2);
  border-top-color: var(--gold); border-radius: 50%;
  animation: spin .7s linear infinite; flex-shrink: 0;
  filter: drop-shadow(0 0 4px var(--gold-glow));
}

/* ── Study Rooms ────────────────────────────────────────── */
.room-list { display: flex; flex-direction: column; gap: 10px; }
.room-card {
  background: var(--glass-thick); border: 1px solid var(--border);
  border-radius: var(--r); padding: 18px 20px;
  cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.room-card:hover { border-color: var(--gold); transform: translateX(3px); box-shadow: var(--shadow-md), 0 0 16px var(--gold-glow); }
.room-card { position: relative; }
.room-card-delete {
  position: absolute; top: 14px; right: 14px;
  background: none; border: none; color: var(--dim); cursor: pointer;
  padding: 6px; border-radius: var(--rs); flex-shrink: 0;
  opacity: .5; transition: opacity .15s ease, color .15s ease;
  display: flex; align-items: center; justify-content: center;
  min-width: 32px; min-height: 32px;
}
.room-card:hover .room-card-delete { opacity: 1; }
.room-card-delete:hover { color: var(--red); background: var(--red-bg); opacity: 1; }
.room-card-delete:focus-visible { opacity: 1; outline: 2px solid var(--gold); outline-offset: 2px; }
.room-name { font-weight: 600; font-size: 1rem; margin-bottom: 4px; }
.room-meta { font-size: .78rem; color: var(--muted); }
.room-invite-box {
  display: flex; align-items: center; gap: 8px;
  background: var(--glass); border: 1px dashed var(--border2);
  border-radius: var(--rs); padding: 10px 14px; margin: 12px 0;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.room-invite-code {
  font-family: monospace; font-size: 1.1rem; font-weight: 700;
  color: var(--gold); letter-spacing: .05em; flex: 1;
}
.room-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; flex-wrap: wrap; gap: 12px;
}
.room-header h2 {
  font-family: var(--font-heading); font-size: 1.4rem; margin: 0;
}
.room-section {
  margin-bottom: 28px;
}
.room-section h3 {
  font-family: var(--font-heading); font-size: 1.1rem; margin-bottom: 12px;
  color: var(--text);
}
.share-picker {
  display: flex; flex-direction: column; gap: 6px;
  max-height: 300px; overflow-y: auto;
}
.share-picker-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border: 1px solid var(--border);
  border-radius: var(--rs); cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  background: var(--glass);
}
.share-picker-item:hover { border-color: var(--gold); background: var(--gold-bg); box-shadow: 0 0 12px var(--gold-glow); }
.share-picker-item .doc-name { flex: 1; font-size: .88rem; font-weight: 500; }

/* ── Reduced Motion ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,*::before,*::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ── Touch devices: always show card actions ──────────────── */
@media (hover: none) {
  .doc-card .card-actions { opacity: 1; }
  .doc-item .doc-delete-btn { opacity: 1; }
  .room-card .room-card-delete { opacity: 1; }
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .wrap { padding: 28px 16px 100px; }
  .card { padding: 24px; }
  .md { padding: 0; }
  #drop-zone { padding: 36px 16px; }
  .upload-hero-card #drop-zone { padding: 48px 20px; }
  .fc-grid { grid-template-columns: 1fr; }
  .fc { min-height: 120px; }
  .fc-inner > * { min-height: 120px; }
  .logo { font-size: 1.8rem; }
  .provider-toggle { flex-direction: column; }
  .top-bar { flex-direction: column; align-items: flex-start; }
  .control-bar .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .mobile-nav { display: block; }
  .nav-backdrop { display: block; }
  .doc-grid { grid-template-columns: 1fr; }
  .bottom-bar { padding: 10px 12px; gap: 8px; }
  .bar-divider { display: none; }
  .wrap { padding-bottom: 96px; }
  .room-header { flex-direction: column; align-items: flex-start; }
  .room-header .flex-row { flex-wrap: wrap; gap: 8px; }
  .share-picker-item .doc-name { max-width: 160px; }
}

/* ── Small phone (≤480px) ──────────────────────────────────── */
@media (max-width: 480px) {
  .wrap { padding: 20px 16px 96px; }
  .card { padding: 20px; }
  .tab { padding: 10px 14px; font-size: .82rem; }
  #drop-zone { padding: 28px 14px; }
  .upload-hero-card #drop-zone { padding: 36px 16px; }
  .phase-dot { width: 28px; height: 28px; }
  .phase-label { display: none; }
  .phase-line { width: 20px; margin: 0 4px 16px; }
  .md { font-size: .92rem; }
  .md p { margin: 6px 0; }
  .stats { gap: 6px; }
  .stat { padding: 3px 10px; font-size: .72rem; }
  .bottom-bar { padding: 8px 8px; gap: 6px; }
  .bar-pill { padding: 5px 10px; font-size: .72rem; }
  .bar-select { font-size: .72rem; padding: 5px 8px; }
  .bar-btn { padding: 7px 14px; font-size: .78rem; }
  .logo { font-size: 1.5rem; }
  .res-head { flex-direction: column; align-items: flex-start; }
  .res-actions { width: 100%; flex-wrap: wrap; }
}

/* ── Desktop layout (≥900px) ──────────────────────────────── */
@media (min-width: 900px) {
  .wrap { max-width: 920px; }
  .card { padding: 40px; }
  .fc-grid { grid-template-columns: repeat(2, minmax(280px, 1fr)); }
  .tab { padding: 12px 24px; font-size: .92rem; }
  #drop-zone { padding: 56px 32px; }
  .doc-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
}

/* ── Widescreen (≥1200px) ────────────────────────────────── */
@media (min-width: 1200px) {
  .wrap { max-width: 1100px; }
  .fc-grid { grid-template-columns: repeat(3, minmax(280px, 1fr)); }
  .doc-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .chat-container { height: 500px; max-height: 60vh; }
  .md { margin: 0 auto; }
  .upload-hero-card { max-width: 860px; }
  .bottom-bar { padding: 14px 32px; justify-content: space-between; }
  .stats { gap: 12px; }
  .bar-pills .bar-pill { font-size: .82rem; padding: 8px 18px; }
}

/* ── Bottom-bar 2-row (≤600px) ──────────────────────────── */
@media (max-width: 600px) {
  .bottom-bar {
    flex-direction: column;
    gap: 10px;
    padding: 12px 16px;
  }
  .bar-group { width: 100%; justify-content: center; flex-wrap: wrap; }
  .bar-divider { display: none; }
  .bar-btn { width: 100%; }
}

/* ── Print styles ─────────────────────────────────────────── */
@media print {
  .control-bar, .top-bar, footer, .btn-danger, .provider-toggle,
  #prog-section, .res-actions, .fc-hint, .toggle-pill, .fc-hint-text,
  .panel-download, #err-box, .toast-container {
    display: none !important;
  }
  body { background: #fff; color: #000; }
  .wrap { max-width: 100%; padding: 0; }
  .card { border: none; box-shadow: none; padding: 0; }
  .panel { display: block !important; break-inside: avoid; }
  .tabs { display: none; }
  .md { color: #000; }
  .md strong { color: #000; }
  .md em { color: #333; }
  .fc-grid { grid-template-columns: 1fr; gap: 8px; }
  .fc { break-inside: avoid; }
  .fc-inner { display: block; }
  .fc-inner > * { grid-area: auto; min-height: auto; position: static; }
  .fc-front, .fc-back {
    position: static !important; transform: none !important;
    backface-visibility: visible !important; -webkit-backface-visibility: visible !important;
    border: 1px solid #ddd; box-shadow: none; background: #fff;
    margin-bottom: 8px; min-height: auto;
  }
  .fc .lbl { color: #000; }
  .fc .a { color: #000; }
  .doc-item { border-color: #ddd; box-shadow: none; animation: none; }
  a.link, a.link:hover { color: #000; }
  a[href]::after { content: " (" attr(href) ")"; font-size: .7em; }
}