/* ====== THEME — Navia-inspired warm light ====== */
:root {
  --black: #0d0d0d;
  --white: #ffffff;
  --bg: #faf9f7;
  --surface: #ffffff;
  --surface-2: #f5f4f2;
  --grey-50: #f5f4f2;
  --grey-100: #ebeae6;
  --grey-200: #dcdbd6;
  --grey-300: #c2c1ba;
  --grey-500: #6c6e74;
  --grey-700: #3a3a3a;
  --text: #0d0d0d;
  --muted: #6c6e74;
  --border: rgba(0,0,0,0.08);
  --accent: #2b180a;
  --accent-light: #3d2b1a;
  --accent-2: #22c55e;
  --danger: #dc2626;
  --success: #16a34a;
  --warning: #f59e0b;
  --radius: 16px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --sidebar-w: 240px;
  --shadow: 0 4px 20px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.04);
  --shadow-sm: 0 1px 6px rgba(0,0,0,.05);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.04);
  --glass: rgba(250,249,247,.85);
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-serif: "IBM Plex Serif", Georgia, serif;
}

/* ====== RESET ====== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; -webkit-font-smoothing: antialiased; }
html, body { height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.5;
  overflow: hidden;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ====== AUTH — SPLIT SCREEN ====== */
.auth-page { display: flex; height: 100vh; overflow: hidden; }

.auth-brand {
  flex: 0 0 44%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 52px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(150deg, #faf7f3 0%, #f3ede4 55%, #efe7db 100%);
  border-right: 1px solid var(--border);
}
.auth-brand::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(700px 500px at 15% 15%, rgba(43,24,10,.06), transparent 55%),
    radial-gradient(500px 400px at 85% 85%, rgba(34,197,94,.06), transparent 55%);
  pointer-events: none;
}
.auth-brand-inner { position: relative; z-index: 1; max-width: 360px; }

.brand-logo-row { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
.brand-icon {
  width: 50px; height: 50px;
  background: var(--accent);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}
.brand-name {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 400;
  letter-spacing: -.5px;
  color: var(--accent);
}
.brand-tagline { font-size: 15px; color: var(--grey-500); line-height: 1.65; margin-bottom: 36px; }
.feature-list { list-style: none; display: flex; flex-direction: column; gap: 13px; }
.feature-list li { display: flex; align-items: flex-start; gap: 11px; font-size: 13.5px; color: var(--grey-700); line-height: 1.5; }
.feat-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); flex-shrink: 0; margin-top: 6px; }

.auth-form-panel {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  padding: 40px 24px;
  overflow-y: auto;
  background: var(--bg);
}
.auth-card { width: 100%; max-width: 380px; }
.auth-card h2 { font-family: var(--font-serif); font-size: 26px; font-weight: 400; letter-spacing: -.4px; margin-bottom: 5px; color: var(--accent); }
.auth-subtitle { font-size: 14px; color: var(--grey-500); margin-bottom: 30px; }
.auth-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.auth-field label { font-size: 13px; font-weight: 500; color: var(--grey-700); }
.auth-field input {
  background: var(--grey-50);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 12px 14px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color .2s, box-shadow .2s, background .2s;
  width: 100%;
}
.auth-field input:focus { background: var(--white); border-color: var(--grey-200); box-shadow: 0 0 0 3px rgba(0,0,0,.03); }
.auth-field input::placeholder { color: var(--grey-300); }
.hint { display: block; margin-top: 4px; font-size: 11px; color: var(--muted); }
.auth-actions { margin-top: 22px; display: flex; flex-direction: column; gap: 10px; }
.auth-footer { text-align: center; font-size: 13px; color: var(--grey-500); margin-top: 22px; }
.msg-inline { font-size: 13px; color: var(--grey-500); min-height: 18px; margin-top: 6px; }
.msg-inline.error { color: var(--danger); }
.msg-inline.success { color: var(--success); }

/* ====== APP LAYOUT ====== */
.app-layout { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--white);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-brand {
  display: flex; align-items: center; gap: 11px;
  padding: 18px 18px;
  border-bottom: 1px solid var(--border);
}
.sidebar-icon {
  width: 32px; height: 32px;
  background: var(--accent);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
}
.sidebar-name { font-family: var(--font-serif); font-size: 19px; font-weight: 400; letter-spacing: -.3px; color: var(--accent); }
.sidebar-nav { flex: 1; padding: 12px 10px; display: flex; flex-direction: column; gap: 3px; overflow-y: auto; }
.nav-label {
  font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: .1em;
  color: var(--grey-300); padding: 10px 10px 5px;
}
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px;
  border-radius: 10px;
  border: none;
  background: transparent;
  color: var(--grey-700);
  font-size: 13.5px;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: background .15s, color .15s;
}
.nav-item:hover { background: var(--grey-50); color: var(--text); }
.nav-item.active { background: color-mix(in srgb, var(--accent) 9%, transparent); color: var(--accent); }
.nav-item svg { width: 16px; height: 16px; flex-shrink: 0; stroke: currentColor; fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.sidebar-bottom { padding: 10px; border-top: 1px solid var(--border); }

/* ====== MAIN CONTENT ====== */
.main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.panel-header h2 { font-family: var(--font-serif); font-size: 20px; font-weight: 400; letter-spacing: -.3px; color: var(--accent); margin-bottom: 1px; }
.panel-header .ph-sub { font-size: 12.5px; color: var(--grey-500); }

.tab-panel { display: none; flex: 1; overflow: hidden; flex-direction: column; }
.tab-panel.active { display: flex; }

/* ====== CHAT LAYOUT ====== */
.chat-layout { display: flex; flex: 1; overflow: hidden; }
.chat-settings {
  width: 280px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--white);
}
.settings-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}
.settings-card-title {
  font-size: 10.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em;
  color: var(--grey-300); margin-bottom: 12px;
}

/* Drop zone */
.drop-zone {
  border: 1.5px dashed var(--grey-200);
  border-radius: var(--radius-sm);
  padding: 20px 10px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
  margin-bottom: 10px;
  background: var(--grey-50);
}
.drop-zone:hover, .drop-zone.drag-over { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 4%, var(--grey-50)); }
.drop-zone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.dz-icon { font-size: 22px; margin-bottom: 6px; }
.dz-title { font-size: 13px; color: var(--grey-700); font-weight: 500; }
.dz-hint { font-size: 11px; color: var(--grey-300); margin-top: 2px; }

.file-list { display: flex; flex-direction: column; gap: 5px; margin-bottom: 8px; }
.file-chip {
  display: flex; align-items: center; gap: 7px;
  background: var(--grey-50);
  border: 1px solid var(--grey-100);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 11.5px;
  color: var(--grey-700);
}

/* Settings details */
details.adv > summary {
  font-size: 12px; color: var(--grey-500); cursor: pointer; user-select: none; list-style: none;
  padding: 6px 2px; display: flex; align-items: center; gap: 5px;
}
details.adv > summary::before { content: "▸"; font-size: 10px; transition: transform .15s; }
details.adv[open] > summary::before { transform: rotate(90deg); }
details.adv > summary:hover { color: var(--text); }
.adv-grid { display: flex; flex-direction: column; gap: 10px; padding-top: 10px; }

/* Fields */
.field { display: flex; flex-direction: column; gap: 5px; }
.field label, .flabel { font-size: 11.5px; color: var(--grey-500); font-weight: 500; }
.field input[type="text"], .field input[type="number"] {
  background: var(--grey-50);
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--text);
  padding: 9px 12px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color .2s, box-shadow .2s, background .2s;
  width: 100%;
}
.field input:focus { background: var(--white); border-color: var(--grey-200); box-shadow: 0 0 0 3px rgba(0,0,0,.03); }
.field input::placeholder { color: var(--grey-300); }
.toggle-row { flex-direction: row; align-items: center; justify-content: space-between; }

.switch { position: relative; display: inline-block; width: 40px; height: 22px; flex-shrink: 0; }
.switch input { display: none; }
.slider { position: absolute; inset: 0; background: var(--grey-200); border-radius: 999px; cursor: pointer; transition: .2s; }
.slider::before { content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; background: var(--white); border-radius: 50%; transition: .2s; box-shadow: var(--shadow-sm); }
input:checked + .slider { background: var(--accent-2); }
input:checked + .slider::before { transform: translateX(18px); }

.session-badge {
  background: color-mix(in srgb, var(--accent-2) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 25%, transparent);
  border-radius: 10px;
  padding: 8px 11px;
  font-size: 11.5px;
  color: #15803d;
  line-height: 1.5;
  display: none;
  word-break: break-all;
}
.session-badge.visible { display: block; }

/* ====== CHAT MESSAGES ====== */
.chat-main { flex: 1; display: flex; flex-direction: column; overflow: hidden; background: var(--bg); width: 100%; max-width: 860px; margin: 0 auto; }
.messages { flex: 1; overflow-y: auto; padding: 24px 26px; display: flex; flex-direction: column; gap: 14px; scroll-behavior: smooth; }
.message { display: flex; max-width: 80%; animation: msgin .2s ease; }
@keyframes msgin { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }
.message.user { align-self: flex-end; flex-direction: row-reverse; }
.message.assistant { align-self: flex-start; }

.bubble {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}
.message.user .bubble {
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 5px;
}
.message.assistant .bubble {
  background: var(--white);
  border: 1px solid var(--grey-200);
  color: var(--text);
  border-bottom-left-radius: 5px;
  box-shadow: 0 2px 8px rgba(0,0,0,.05);
}
.message.assistant .bubble.thinking { color: var(--grey-500); font-style: italic; }
.eng-tag {
  display: inline-block; font-size: 10px; font-weight: 600; letter-spacing: .5px; text-transform: uppercase;
  padding: 2px 8px; border-radius: var(--radius-pill); margin-top: 8px;
}
.eng-tag.lcel { background: color-mix(in srgb, var(--accent) 10%, transparent); color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent); }
.eng-tag.agent { background: color-mix(in srgb, var(--accent-2) 12%, transparent); color: #15803d; border: 1px solid color-mix(in srgb, var(--accent-2) 22%, transparent); }

.chat-input-bar {
  padding: 14px 18px;
  border-top: 1px solid var(--border);
  display: flex; gap: 9px; align-items: center;
  background: var(--bg);
  flex-shrink: 0;
}
.chat-input-bar input {
  flex: 1;
  background: var(--white);
  border: 1px solid var(--grey-200);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 12px 16px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  box-shadow: var(--shadow-sm);
  transition: border-color .2s, box-shadow .2s, background .2s;
}
.chat-input-bar input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 12%, transparent); }
.chat-input-bar input::placeholder { color: var(--grey-300); }

/* Engine toggle */
.engine-toggle { display: flex; align-items: center; gap: 9px; font-size: 12.5px; color: var(--grey-500); white-space: nowrap; }

/* ====== BUTTONS ====== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  border: 1px solid var(--grey-200);
  background: var(--white);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13.5px;
  font-family: inherit;
  font-weight: 500;
  user-select: none;
  transition: background .15s, border-color .15s, transform .1s, opacity .15s, color .15s;
  white-space: nowrap;
  text-decoration: none;
}
.btn:hover, .btn:focus { text-decoration: none; }
.btn:hover { background: var(--grey-50); border-color: var(--grey-300); }
.btn:active { transform: scale(.98); }
.btn.primary { background: var(--accent); border: 1px solid var(--accent); color: #fff; font-weight: 600; box-shadow: var(--shadow-sm); }
.btn.primary:hover { background: var(--accent-light); border-color: var(--accent-light); }
.btn.secondary { background: color-mix(in srgb, var(--accent-2) 12%, transparent); border-color: color-mix(in srgb, var(--accent-2) 25%, transparent); color: #15803d; }
.btn.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 25%, transparent); background: var(--white); }
.btn.danger:hover { background: color-mix(in srgb, var(--danger) 7%, transparent); }
.btn.full { width: 100%; }
.btn.icon-only { padding: 11px; border-radius: var(--radius-sm); }
.btn:disabled, .btn.loading { opacity: .5; pointer-events: none; }
.btn.loading::after {
  content: ""; width: 13px; height: 13px;
  border: 2px solid currentColor; border-top-color: transparent; border-radius: 50%;
  animation: spin .6s linear infinite; flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ====== ANALYSIS / COMPARE PANELS ====== */
.panel-body { flex: 1; overflow-y: auto; padding: 22px 24px; background: var(--bg); width: 100%; max-width: 900px; margin: 0 auto; }
.form-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; margin-bottom: 16px; box-shadow: var(--shadow-sm); }
.form-card-title { font-size: 10.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--grey-300); margin-bottom: 14px; }

.upload-drop {
  border: 1.5px dashed var(--grey-200);
  border-radius: var(--radius-sm);
  padding: 30px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
  margin-bottom: 14px;
  background: var(--grey-50);
}
.upload-drop:hover, .upload-drop.drag-over { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 4%, var(--grey-50)); }
.upload-drop input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.upload-drop-icon { font-size: 28px; margin-bottom: 8px; }
.upload-drop p { font-size: 13.5px; color: var(--grey-700); margin-bottom: 3px; }
.upload-drop .ud-hint { font-size: 12px; color: var(--grey-300); }
.upload-drop .selected-name { margin-top: 10px; font-size: 12.5px; color: var(--accent); font-weight: 600; }

.compare-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }

.result-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.result-card-head {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 10.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em;
  color: var(--grey-300);
  display: flex; align-items: center; gap: 8px;
}
pre.code {
  background: var(--grey-50);
  color: var(--grey-700);
  padding: 16px;
  font-size: 12.5px;
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  overflow: auto;
  max-height: 420px;
  line-height: 1.65;
  margin: 0;
}

/* Table */
.table-wrap { overflow: auto; max-height: 420px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 11px 16px; border-bottom: 1px solid var(--border); vertical-align: top; text-align: left; }
thead th {
  position: sticky; top: 0; z-index: 1;
  background: var(--grey-50);
  color: var(--grey-500);
  font-size: 10.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .06em;
}
tbody tr { transition: background .12s; }
tbody tr:hover td { background: var(--grey-50); }
tbody tr:last-child td { border-bottom: none; }
.td-page { color: var(--grey-500); font-size: 12.5px; width: 90px; }
/* Comparison: caption + two-column Added / Removed table */
.cmp-caption { margin: 14px 18px 12px; color: var(--grey-500); font-size: 13px; }
.th-added, .td-added { width: 50%; }
.th-removed, .td-removed { width: 50%; }
.td-added, .td-removed { vertical-align: top; }
.td-added ul, .td-removed ul { margin: 0; padding-left: 18px; }
.td-added li, .td-removed li { margin: 0 0 6px; line-height: 1.5; }
.td-added li:last-child, .td-removed li:last-child { margin-bottom: 0; }
.td-added li::marker { color: var(--accent-2, #22c55e); }
.td-removed li::marker { color: var(--danger, #ef4444); }
.td-added strong, .td-removed strong { font-weight: 600; }
.cmp-none { color: var(--grey-400, #9ca3af); font-size: 12.5px; font-style: italic; }
.cmp-pg { display: inline-block; font-size: 10.5px; color: var(--grey-500); background: var(--grey-100, #f1f0ee); border-radius: 4px; padding: 0 5px; margin-right: 2px; }

/* ====== TOASTS ====== */
#toast-container { position: fixed; top: 16px; right: 16px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; pointer-events: none; }
.toast {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 15px;
  font-size: 13.5px;
  color: var(--text);
  display: flex; align-items: center; gap: 10px;
  min-width: 220px; max-width: 320px;
  box-shadow: var(--shadow-lg);
  pointer-events: all;
  animation: tin .22s ease;
}
@keyframes tin { from { opacity: 0; transform: translateX(18px); } to { opacity: 1; transform: none; } }
.toast.success { border-color: color-mix(in srgb, var(--success) 35%, transparent); }
.toast.error { border-color: color-mix(in srgb, var(--danger) 35%, transparent); }
.toast.info { border-color: color-mix(in srgb, var(--accent) 25%, transparent); }
.toast-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.toast.success .toast-dot { background: var(--success); }
.toast.error .toast-dot { background: var(--danger); }
.toast.info .toast-dot { background: var(--accent); }

/* ====== SCROLLBAR ====== */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--grey-200); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--grey-300); }

/* ====== UTILS ====== */
.muted { color: var(--muted); }
.small { font-size: 12px; }
.divider { height: 1px; background: var(--border); margin: 12px 0; }

/* ====== RESPONSIVE (legacy app shell) ====== */
@media (max-width: 820px) {
  .auth-brand { display: none; }
  .compare-row { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════════════════════════════════
   LANDING + APP SHELL + MODAL  (Navia-inspired)
═══════════════════════════════════════════════════════════════ */

/* View routing */
.view { display: none; }
.view.active { display: block; }
#view-landing.active { height: 100vh; overflow-y: auto; }
.app-view.active { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }

/* Landing nav */
.landing-nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 40px; height: 60px;
  background: var(--glass);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.landing-logo { font-family: var(--font-serif); font-size: 20px; color: var(--accent); letter-spacing: -.4px; }
.nav-cta {
  font-size: 13px; font-weight: 600; color: var(--accent);
  padding: 8px 16px; border-radius: var(--radius-pill);
  border: 1px solid var(--border); transition: background .15s;
}
.nav-cta:hover { background: var(--grey-50); text-decoration: none; }

/* Hero */
.hero { max-width: 820px; margin: 0 auto; padding: 84px 24px 56px; text-align: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 500; color: var(--grey-700);
  background: var(--white); border: 1px solid var(--border);
  padding: 6px 14px; border-radius: var(--radius-pill); margin-bottom: 28px; box-shadow: var(--shadow-sm);
}
.hero-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent-2) 18%, transparent); }
.hero-title { font-family: var(--font-serif); font-weight: 400; font-size: clamp(40px, 6vw, 66px); line-height: 1.05; letter-spacing: -1.5px; color: var(--accent); margin-bottom: 22px; }
.hero-title em { font-style: italic; }
.hero-sub { font-size: 17px; line-height: 1.65; color: var(--grey-500); max-width: 580px; margin: 0 auto 32px; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Supported file types marquee — confined to the hero text column, fading
   out at the left edge of the headline ("Many") and the matching right edge. */
.hero-formats { max-width: 820px; margin: 0 auto; padding: 8px 24px 44px; }
.hf-label { text-align: center; font-size: 11px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--grey-300); margin-bottom: 18px; }
.marquee {
  overflow: hidden; position: relative; width: 100%;
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 7%, #000 93%, transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0, #000 7%, #000 93%, transparent 100%);
}
.marquee-track { display: flex; gap: 14px; width: max-content; animation: marquee 60s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.format-chip {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 9px 16px;
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-pill); box-shadow: var(--shadow-sm); white-space: nowrap;
}
.fmt-badge { width: 28px; height: 28px; border-radius: 7px; display: flex; align-items: center; justify-content: center; font-size: 9px; font-weight: 700; color: #fff; letter-spacing: .02em; flex-shrink: 0; }
.fmt-name { font-size: 13px; font-weight: 500; color: var(--grey-700); }

/* Big / variant buttons */
.btn.lg { height: 52px; padding: 0 28px; font-size: 15px; border-radius: var(--radius-pill); }
.btn.sm { padding: 7px 13px; font-size: 12.5px; }
.btn.ghost { background: var(--white); border: 1px solid var(--grey-200); color: var(--text); box-shadow: none; }
.btn.ghost:hover { background: var(--grey-50); border-color: var(--grey-300); }
.btn.light { background: var(--white); color: var(--accent); border: none; border-radius: var(--radius-pill); font-weight: 600; }
.btn.light:hover { background: var(--grey-50); }

/* Sections */
/* scroll-margin-top keeps anchored sections clear of the sticky nav (60px)
   with a gap, so cards don't sit right under the nav line. */
.section { max-width: 1100px; margin: 0 auto; padding: 56px 32px; scroll-margin-top: 84px; }
.section-label { font-size: 11px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--grey-300); margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.section-label::before { content: ""; width: 18px; height: 1px; background: var(--grey-300); }
.section-title { font-family: var(--font-serif); font-weight: 400; font-size: clamp(30px, 4vw, 44px); line-height: 1.1; letter-spacing: -1px; color: var(--accent); }
.section-title em { font-style: italic; }
.section-lead { font-size: 16px; line-height: 1.65; color: var(--grey-500); margin-top: 18px; max-width: 460px; }

/* Feature cards (square) */
.feature-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; display: flex; flex-direction: column; gap: 12px;
  box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s;
  aspect-ratio: 1 / 1;
}
.feature-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.fc-icon { width: 48px; height: 48px; border-radius: 14px; background: var(--grey-50); border: 1px solid var(--grey-100); display: flex; align-items: center; justify-content: center; font-size: 22px; }
.fc-title { font-family: var(--font-serif); font-size: 22px; font-weight: 400; color: var(--accent); }
.fc-desc { font-size: 13.5px; line-height: 1.6; color: var(--grey-500); flex: 1; }
.fc-try { align-self: flex-start; margin-top: 2px; border-radius: var(--radius-pill); }

/* Problem */
.problem { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: start; }
.problem-items { display: flex; flex-direction: column; }
.problem-item { display: flex; gap: 16px; padding: 22px 0; border-top: 1px solid var(--border); }
.problem-item:first-child { border-top: none; padding-top: 0; }
.pi-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--grey-50); border: 1px solid var(--grey-100); display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.problem-item strong { display: block; font-size: 15px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.problem-item p { font-size: 13.5px; line-height: 1.6; color: var(--grey-500); }

/* How it works */
.how-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-top: 36px; }
.how-step { border-left: 1px solid var(--border); padding-left: 24px; }
.how-step:first-child { border-left: none; padding-left: 0; }
.hs-num { font-family: var(--font-serif); font-size: 44px; font-weight: 400; color: var(--grey-200); line-height: 1; }
.how-step h3 { font-size: 17px; font-weight: 600; color: var(--text); margin: 12px 0 8px; }
.how-step > p { font-size: 13.5px; line-height: 1.6; color: var(--grey-500); margin-bottom: 16px; }
.hs-quote { font-size: 13px; font-style: italic; color: var(--grey-700); background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; line-height: 1.5; }

/* Stats band */
.stats-band { background: var(--accent); border-radius: var(--radius); padding: 34px 26px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; box-shadow: var(--shadow); }
.stat { padding: 0 8px; border-left: 1px solid rgba(255,255,255,.12); }
.stat:first-child { border-left: none; }
.stat-num { font-family: var(--font-serif); font-size: 40px; font-weight: 400; color: #fff; line-height: 1; margin-bottom: 10px; }
.stat-label { font-size: 12.5px; line-height: 1.5; color: rgba(255,255,255,.62); }

/* Final CTA */
.cta-band { background: linear-gradient(135deg, #2b180a, #3d2b1a); border-radius: var(--radius); padding: 48px 44px; display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; box-shadow: var(--shadow); }
.cta-title { font-family: var(--font-serif); font-weight: 400; font-size: clamp(28px, 4vw, 40px); line-height: 1.1; letter-spacing: -.5px; color: #fff; }
.cta-title em { font-style: italic; }
.cta-text p { font-size: 15px; color: rgba(255,255,255,.72); margin-top: 12px; max-width: 420px; line-height: 1.6; }

.landing-footer { text-align: center; padding: 32px; font-size: 12.5px; color: var(--grey-300); border-top: 1px solid var(--border); }

/* App bar (chat/analyze/compare) */
.app-bar { display: flex; align-items: center; gap: 16px; padding: 12px 22px; border-bottom: 1px solid var(--border); background: var(--glass); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); flex-shrink: 0; }
.app-back { background: none; border: none; font-family: inherit; font-size: 14px; font-weight: 600; color: var(--accent); cursor: pointer; padding: 6px 8px; border-radius: 8px; }
.app-back:hover { background: var(--grey-50); }
.app-bar-title { font-family: var(--font-serif); font-size: 17px; color: var(--accent); }
.app-bar-right { margin-left: auto; display: flex; align-items: center; gap: 14px; }

/* Modal */
.modal-overlay { position: fixed; inset: 0; z-index: 9998; display: none; align-items: center; justify-content: center; background: rgba(13,13,13,.45); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); padding: 24px; }
.modal-overlay.open { display: flex; }
.modal { position: relative; background: var(--white); border-radius: var(--radius); width: 100%; max-width: 480px; max-height: 88vh; overflow-y: auto; padding: 32px 30px 26px; box-shadow: var(--shadow-lg); animation: msgin .25s ease; }
.modal-close { position: absolute; top: 16px; right: 16px; width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--border); background: var(--white); color: var(--grey-500); font-size: 20px; line-height: 1; cursor: pointer; }
.modal-close:hover { background: var(--grey-50); color: var(--text); }
.modal-title { font-family: var(--font-serif); font-size: 24px; font-weight: 400; color: var(--accent); margin-bottom: 4px; }
.modal-sub { font-size: 14px; color: var(--grey-500); margin-bottom: 22px; }
.modal-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }

/* Landing responsive */
@media (max-width: 860px) {
  .landing-nav { padding: 0 20px; }
  .feature-cards { grid-template-columns: 1fr; }
  .feature-card { aspect-ratio: auto; }
  .problem { grid-template-columns: 1fr; gap: 28px; }
  .how-steps { grid-template-columns: 1fr; gap: 24px; }
  .how-step { border-left: none; padding-left: 0; }
  .stats-band { grid-template-columns: 1fr 1fr; }
  .stat { border-left: none; }
  .cta-band { flex-direction: column; align-items: flex-start; }
}