/* ═══════════════════════════════════════════════════
   TextFileCompare 2.0 — Main Stylesheet
   Design: Refined utilitarian. Sharp, purposeful, fast.
   Font: Plus Jakarta Sans + JetBrains Mono
═══════════════════════════════════════════════════ */

/* ── DESIGN TOKENS ── */
:root {
  --font-ui:   'Plus Jakarta Sans', system-ui, sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', monospace;

  /* Brand */
  --brand:       #2563EB;
  --brand-dark:  #1D4ED8;
  --brand-light: #EFF6FF;
  --brand-ring:  rgba(37,99,235,.18);

  /* Surface scale */
  --bg-base:    #F8F9FB;
  --bg-surface: #FFFFFF;
  --bg-subtle:  #F1F3F7;
  --bg-muted:   #E8EBF0;

  /* Text scale */
  --tx-base:    #0F1117;
  --tx-muted:   #5A6070;
  --tx-faint:   #9AA0AE;

  /* Borders */
  --bd:         rgba(0,0,0,.08);
  --bd-strong:  rgba(0,0,0,.14);

  /* Diff colors */
  --add-bg:     #DCFCE7;
  --add-word:   #86EFAC;
  --add-tx:     #166534;
  --del-bg:     #FEE2E2;
  --del-word:   #FCA5A5;
  --del-tx:     #991B1B;

  /* Status */
  --green:  #16A34A;
  --red:    #DC2626;
  --amber:  #D97706;

  /* Sizes */
  --nav-h:    56px;
  --radius:   8px;
  --radius-lg:12px;
  --radius-xl:16px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.1),  0 4px 8px rgba(0,0,0,.06);

  /* Transitions */
  --ease: cubic-bezier(.16,1,.3,1);
}

/* ── DARK MODE ── */
[data-theme="dark"] {
  --bg-base:    #0D0F14;
  --bg-surface: #141720;
  --bg-subtle:  #1C1F2B;
  --bg-muted:   #242838;

  --tx-base:    #E8ECF5;
  --tx-muted:   #8891A8;
  --tx-faint:   #525C72;

  --bd:         rgba(255,255,255,.07);
  --bd-strong:  rgba(255,255,255,.12);

  --add-bg:     #052E16;
  --add-word:   #14532D;
  --add-tx:     #86EFAC;
  --del-bg:     #2D0000;  /* deeper red in dark */
  --del-word:   #7F1D1D;
  --del-tx:     #FCA5A5;

  --brand-light: #1e3a5f;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,.4);
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-ui);
  background: var(--bg-base);
  color: var(--tx-base);
  min-height: 100vh;
  display: flex; flex-direction: column;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
button, select, input, textarea { font-family: inherit; }

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bd-strong); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--tx-faint); }

/* ══════════════════════════════════════════
   HEADER / NAV
══════════════════════════════════════════ */
.site-header {
  position: sticky; top: 0; z-index: 500;
  height: var(--nav-h);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--bd);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-inner {
  max-width: 1400px; margin: 0 auto;
  height: 100%;
  display: flex; align-items: center; gap: 16px;
  padding: 0 16px;
}

/* Logo always on left, actions always on right */
.site-logo {
  display: flex; align-items: center; gap: 9px;
  text-decoration: none; flex-shrink: 0;
}

.logo-icon {
  width: 32px; height: 32px;
  background: var(--brand);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(37,99,235,.3);
}
.logo-icon-sm { width: 24px; height: 24px; border-radius: 6px; }

.logo-text {
  font-size: 15px; font-weight: 700;
  color: var(--tx-base); letter-spacing: -.03em;
}

.nav-links {
  display: flex; align-items: center; gap: 4px;
  flex: 1;
}

.nav-links a {
  font-size: 13px; font-weight: 500;
  color: var(--tx-muted);
  padding: 5px 10px; border-radius: 6px;
  text-decoration: none; transition: all .15s;
}
.nav-links a:hover  { color: var(--tx-base); background: var(--bg-subtle); }
.nav-links a.active { color: var(--brand); background: var(--brand-light); }

.header-actions {
  display: flex; align-items: center; gap: 8px;
  flex-shrink: 0;
  margin-left: auto;
}

/* Theme toggle button */
.theme-btn {
  width: 34px; height: 34px;
  border: 1px solid var(--bd-strong);
  background: var(--bg-subtle);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--tx-muted);
  transition: all .15s;
}
.theme-btn:hover { color: var(--tx-base); background: var(--bg-muted); }
[data-theme="dark"]  .icon-sun  { display: block; }
[data-theme="dark"]  .icon-moon { display: none;  }
[data-theme="light"] .icon-sun  { display: none;  }
[data-theme="light"] .icon-moon { display: block; }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 4.5px;
  background: none; border: 1px solid var(--bd-strong);
  border-radius: 7px; padding: 7px 8px; cursor: pointer;
}
.hamburger span {
  display: block; width: 18px; height: 1.5px;
  background: var(--tx-muted); border-radius: 2px;
  transition: all .2s;
}
.hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile overlay & drawer */
.mobile-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.45); z-index: 800;
  backdrop-filter: blur(2px);
}
.mobile-overlay.open { display: block; }

.mobile-drawer {
  position: fixed; top: 0; right: -300px; bottom: 0;
  width: 280px; background: var(--bg-surface);
  border-left: 1px solid var(--bd);
  z-index: 900; padding: 0;
  display: flex; flex-direction: column;
  transition: right .28s var(--ease);
  overflow-y: auto;
}
.mobile-drawer.open { right: 0; }

.drawer-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--bd);
}
.drawer-close {
  background: none; border: none; font-size: 16px;
  color: var(--tx-faint); cursor: pointer; padding: 4px;
}

.mobile-drawer a {
  display: block; padding: 12px 20px;
  font-size: 14px; font-weight: 500;
  color: var(--tx-muted); text-decoration: none;
  border-bottom: 1px solid var(--bd);
  transition: all .12s;
}
.mobile-drawer a:hover { color: var(--tx-base); background: var(--bg-subtle); }

/* ══════════════════════════════════════════
   BUTTONS & FORM PRIMITIVES
══════════════════════════════════════════ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 5px;
  font-family: var(--font-ui); font-size: 13px; font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius); cursor: pointer;
  padding: 6px 14px; white-space: nowrap;
  transition: all .15s; text-decoration: none;
  line-height: 1.4;
}
.btn:active { transform: scale(.97); }

.btn-primary {
  background: var(--brand); color: #fff; border-color: var(--brand);
  box-shadow: 0 2px 8px rgba(37,99,235,.25);
}
.btn-primary:hover { background: var(--brand-dark); text-decoration: none; color: #fff; }

.btn-ghost {
  background: var(--bg-subtle); color: var(--tx-muted);
  border-color: var(--bd-strong);
}
.btn-ghost:hover { background: var(--bg-muted); color: var(--tx-base); }

.btn-danger { background: #FEF2F2; color: var(--red); border-color: #FECACA; }
.btn-danger:hover { background: #FEE2E2; }

/* Compare button — distinct style + active state */
#compareBtn {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
  font-weight: 600;
  letter-spacing: -.01em;
  box-shadow: 0 2px 8px rgba(37,99,235,.28);
  padding: 7px 20px;
  font-size: 13.5px;
  position: relative;
}
#compareBtn:hover  { background: var(--brand-dark); box-shadow: 0 3px 12px rgba(37,99,235,.38); }
#compareBtn.active {
  background: #16A34A;
  border-color: #16A34A;
  box-shadow: 0 2px 8px rgba(22,163,74,.3);
}
#compareBtn.active:hover { background: #15803D; }

.btn-sm { font-size: 12px; padding: 4px 10px; }
.btn-xs { font-size: 11px; padding: 3px 7px; }
.btn-icon { padding: 6px; }

/* ══════════════════════════════════════════
   TOAST
══════════════════════════════════════════ */
.toast {
  position: fixed; bottom: 24px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--tx-base); color: var(--bg-surface);
  font-size: 13px; font-weight: 500;
  padding: 9px 18px; border-radius: 20px;
  z-index: 9999; pointer-events: none;
  opacity: 0; transition: opacity .2s, transform .2s var(--ease);
  white-space: nowrap; max-width: 90vw;
  box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.toast-success { background: var(--green); color: #fff; }
.toast.toast-error   { background: var(--red);   color: #fff; }

/* ══════════════════════════════════════════
   TOOL PAGE — HERO
══════════════════════════════════════════ */
.tool-hero {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--bd);
  padding: 32px 20px 24px;
  text-align: center;
}

.hero-pill {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--brand-light); color: var(--brand);
  font-size: 11px; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase;
  padding: 4px 12px; border-radius: 20px; margin-bottom: 16px;
}
.hero-pill-dot { width: 6px; height: 6px; background: var(--brand); border-radius: 50%; }

.tool-hero h1 {
  font-size: 28px; font-weight: 700; letter-spacing: -.04em;
  color: var(--tx-base); line-height: 1.15; margin-bottom: 10px;
}
.tool-hero h1 em { font-style: normal; color: var(--brand); }

.hero-tagline {
  font-size: 14px; color: var(--tx-muted); line-height: 1.65;
  max-width: 500px; margin: 0 auto 22px;
}

/* ── PRIMARY TOOLBAR ── */
.primary-toolbar {
  display: flex; align-items: center; justify-content: center;
  gap: 6px; flex-wrap: wrap;
}

.tb-select {
  font-family: var(--font-ui); font-size: 12px; font-weight: 500;
  padding: 6px 28px 6px 10px;
  border: 1px solid var(--bd-strong);
  border-radius: var(--radius);
  background: var(--bg-subtle) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%239AA0AE' stroke-width='1.3' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 8px center;
  color: var(--tx-base); cursor: pointer; appearance: none;
  min-width: 130px;
}

.tb-divider { width: 1px; height: 22px; background: var(--bd-strong); flex-shrink: 0; }

/* ══════════════════════════════════════════
   STATS / SECONDARY TOOLBAR
══════════════════════════════════════════ */
.stats-bar {
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--bd);
  padding: 0 12px;
  min-height: 38px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px; flex-wrap: wrap;
  overflow-x: auto; /* mobile scroll */
}

.stats-left, .stats-right {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}

.stat-text {
  font-size: 11.5px; color: var(--tx-faint);
  font-family: var(--font-code);
  white-space: nowrap;
}

.stat-badge {
  font-size: 11px; font-weight: 600;
  padding: 2px 8px; border-radius: 10px;
  white-space: nowrap;
}
.badge-add { background: var(--add-bg); color: var(--add-tx); }
.badge-del { background: var(--del-bg); color: var(--del-tx); }
.badge-info { background: var(--brand-light); color: var(--brand); }

.toggle-chip {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 11.5px; font-weight: 500; color: var(--tx-muted);
  cursor: pointer; white-space: nowrap; user-select: none;
  padding: 3px 0;
}
.toggle-chip input[type="checkbox"] {
  width: 14px; height: 14px; cursor: pointer;
  accent-color: var(--brand);
}

/* Advanced toolbar (collapsible) */
.adv-toolbar {
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--bd);
  padding: 6px 12px;
  display: none; /* hidden by default — toggled via JS */
  align-items: center; gap: 6px; flex-wrap: wrap;
}
.adv-toolbar.open { display: flex; }

.adv-toggle-btn {
  font-size: 11px; font-weight: 600;
  color: var(--tx-muted); background: none;
  border: 1px solid var(--bd-strong);
  border-radius: 5px; padding: 3px 8px; cursor: pointer;
  transition: all .12s;
}
.adv-toggle-btn:hover { background: var(--bg-muted); color: var(--tx-base); }

/* ══════════════════════════════════════════
   EDITOR PANES
══════════════════════════════════════════ */

/* Viewport-filling editor layout.
   --tool-offset = height of everything above the editors:
   nav (56px) + hero (~148px) + stats bar (38px) + adv toolbar (0 when closed) */
:root { --tool-offset: 242px; }

.editors-wrap {
  display: grid; grid-template-columns: 1fr 1fr;
  /* Fill remaining viewport so editors don't need page scroll */
  height: calc(100vh - var(--tool-offset));
  min-height: 320px;
  border-bottom: 1px solid var(--bd);
  background: var(--bg-surface);
}

.editor-pane {
  display: flex; flex-direction: column;
  border-right: 1px solid var(--bd);
  overflow: hidden;
  height: 100%;
}
.editor-pane:last-child { border-right: none; }

.pane-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 12px; height: 36px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--bd);
  flex-shrink: 0;
}

.pane-label {
  display: flex; align-items: center; gap: 7px;
  font-size: 11.5px; font-weight: 600;
  color: var(--tx-muted); letter-spacing: .04em;
  text-transform: uppercase;
}
.pane-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.dot-left  { background: var(--brand); }
.dot-right { background: var(--red); }

.pane-file-name {
  font-size: 11px; font-family: var(--font-code);
  color: var(--tx-faint); margin-left: 4px;
  max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.pane-actions { display: flex; gap: 4px; }

/* CodeMirror inside pane — fill the pane height */
.editor-pane .CodeMirror {
  flex: 1;
  height: 100% !important;
  font-family: var(--font-code) !important;
  font-size: 13px !important;
  line-height: 1.65 !important;
  border: none !important;
  background: var(--bg-surface) !important;
  color: var(--tx-base) !important;
}

/* Remove the old min-height floor — the parent height: 100% handles it */
.editor-pane .CodeMirror-scroll { min-height: unset; }

[data-theme="dark"] .CodeMirror {
  background: var(--bg-surface) !important;
  color: var(--tx-base) !important;
}

/* Gutter */
.CodeMirror-gutters {
  background: var(--bg-subtle) !important;
  border-right: 1px solid var(--bd) !important;
}
.CodeMirror-linenumber { color: var(--tx-faint) !important; }

/* ── MERGE VIEW (CodeMirror) ── */
.merge-wrap {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--bd);
  /* Match the editors-wrap height so compare view fills the viewport too */
  height: calc(100vh - var(--tool-offset));
  min-height: 320px;
  overflow: hidden;
}
.merge-wrap .CodeMirror-merge {
  width: 100% !important;
  height: 100% !important;
}
.merge-wrap .CodeMirror-merge-pane {
  height: 100% !important;
}
.merge-wrap .CodeMirror {
  height: 100% !important;
}
.merge-wrap .CodeMirror-scroll {
  height: 100% !important;
  min-height: unset !important;
}
.merge-wrap .CodeMirror-merge-gap {
  background: var(--bg-subtle) !important;
  border-color: var(--bd) !important;
}

/* ── DIFF HIGHLIGHTS ── */
.CodeMirror-merge-r-chunk      { background: var(--add-bg) !important; }
.CodeMirror-merge-l-chunk      { background: var(--del-bg) !important; }
.CodeMirror-merge-r-chunk-start, .CodeMirror-merge-r-chunk-end { border-color: var(--add-word) !important; }
.CodeMirror-merge-l-chunk-start, .CodeMirror-merge-l-chunk-end { border-color: var(--del-word) !important; }

/* Word diff output */
.word-diff-out {
  font-family: var(--font-code); font-size: 13px; line-height: 1.7;
  padding: 16px 20px;
  background: var(--bg-surface); border-bottom: 1px solid var(--bd);
}
.wd-add { background: var(--add-word); border-radius: 3px; padding: 0 2px; }
.wd-del { background: var(--del-word); border-radius: 3px; padding: 0 2px; text-decoration: line-through; }
.wd-line { display: block; padding: 1px 0; }

/* ══════════════════════════════════════════
   INLINE VIEW
══════════════════════════════════════════ */
.inline-view {
  display: none;
  font-family: var(--font-code); font-size: 13px; line-height: 1.65;
  background: var(--bg-surface); border-bottom: 1px solid var(--bd);
  overflow-x: auto;
}
.inline-view.active { display: block; }

.iv-line { display: flex; }
.iv-num  {
  width: 48px; flex-shrink: 0; text-align: right;
  padding: 2px 10px 2px 0; font-size: 11px;
  color: var(--tx-faint);
  background: var(--bg-subtle);
  border-right: 1px solid var(--bd);
  user-select: none;
}
.iv-sign { width: 20px; flex-shrink: 0; text-align: center; padding: 2px 0; font-weight: 700; }
.iv-code { padding: 2px 12px; flex: 1; white-space: pre-wrap; word-break: break-all; }
.iv-add  { background: var(--add-bg); }
.iv-add .iv-sign { color: var(--add-tx); }
.iv-del  { background: var(--del-bg); }
.iv-del .iv-sign { color: var(--del-tx); }

/* ══════════════════════════════════════════
   SEO / CONTENT SECTION (below tool)
══════════════════════════════════════════ */
.seo-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--bd);
  padding: 56px 20px;
}

.seo-inner { max-width: 960px; margin: 0 auto; }

.seo-section h2 {
  font-size: 20px; font-weight: 700; letter-spacing: -.03em;
  color: var(--tx-base); margin-bottom: 12px;
}

.seo-section p {
  font-size: 14px; color: var(--tx-muted); line-height: 1.75;
  margin-bottom: 14px; max-width: 740px;
}

.seo-features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
  gap: 12px; margin: 28px 0;
}

.seo-feat {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px; border-radius: var(--radius-lg);
  border: 1px solid var(--bd); background: var(--bg-subtle);
  transition: border-color .15s, box-shadow .15s;
}
.seo-feat:hover { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-ring); }

.seo-feat-icon {
  width: 34px; height: 34px; border-radius: 9px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 17px;
}
.seo-feat strong { font-size: 13px; font-weight: 600; display: block; margin-bottom: 2px; }
.seo-feat p { font-size: 12px; margin: 0; line-height: 1.5; }

.seo-links { margin-top: 24px; display: flex; flex-direction: column; gap: 6px; }
.seo-links p { font-size: 13px; color: var(--tx-muted); margin: 0; }

/* FAQ accordion (for SEO & UX) */
.faq-list { max-width: 740px; margin-top: 24px; }
.faq-item { border-top: 1px solid var(--bd); }
.faq-item:last-child { border-bottom: 1px solid var(--bd); }
.faq-q {
  width: 100%; background: none; border: none; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 0; font-size: 14px; font-weight: 600;
  color: var(--tx-base); text-align: left; gap: 12px;
}
.faq-q svg { flex-shrink: 0; transition: transform .2s; color: var(--tx-faint); }
.faq-item.open .faq-q svg { transform: rotate(180deg); }
.faq-a {
  font-size: 13.5px; color: var(--tx-muted); line-height: 1.7;
  padding: 0 0 14px; display: none;
}
.faq-item.open .faq-a { display: block; }

/* ══════════════════════════════════════════
   CONTENT PAGES (about, features, etc.)
══════════════════════════════════════════ */
.content-page { flex: 1; }

.content-wrap {
  max-width: 860px; margin: 0 auto;
  padding: 52px 20px 64px;
}

.content-wrap.narrow { max-width: 640px; }

.page-eyebrow {
  display: inline-block;
  font-size: 11px; font-weight: 700;
  color: var(--brand); background: var(--brand-light);
  padding: 3px 10px; border-radius: 20px;
  text-transform: uppercase; letter-spacing: .06em;
  margin-bottom: 14px;
}

.page-hero-title {
  font-size: 30px; font-weight: 700; letter-spacing: -.04em;
  line-height: 1.2; margin-bottom: 12px;
}

.page-hero-lead {
  font-size: 15px; color: var(--tx-muted); line-height: 1.65;
  max-width: 580px; margin-bottom: 40px;
  padding-bottom: 32px; border-bottom: 1px solid var(--bd);
}

.content-section { margin-bottom: 40px; }
.content-section h2 {
  font-size: 16px; font-weight: 700; letter-spacing: -.02em;
  margin-bottom: 14px; padding-bottom: 8px;
  border-bottom: 1px solid var(--bd); color: var(--tx-base);
}
.content-section h3 { font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--tx-base); }
.content-section p  { font-size: 14px; color: var(--tx-muted); line-height: 1.75; margin-bottom: 10px; }
.content-section ul, .content-section ol { padding-left: 1.4em; margin-bottom: 12px; }
.content-section li { font-size: 14px; color: var(--tx-muted); line-height: 1.75; margin-bottom: 5px; }
.content-section code {
  font-family: var(--font-code); font-size: 12.5px;
  background: var(--bg-muted); border: 1px solid var(--bd-strong);
  padding: 1px 5px; border-radius: 4px; color: var(--brand);
}
.content-section a { color: var(--brand); }
.content-section kbd {
  font-family: var(--font-code); font-size: 11px;
  background: var(--bg-surface); border: 1px solid var(--bd-strong);
  border-radius: 4px; padding: 2px 6px; box-shadow: var(--shadow-sm);
}

/* Feature cards grid */
.feat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr));
  gap: 12px; margin-top: 8px;
}
.feat-card {
  display: flex; gap: 12px; padding: 16px;
  border: 1px solid var(--bd); border-radius: var(--radius-lg);
  background: var(--bg-subtle); transition: border-color .15s;
}
.feat-card:hover { border-color: var(--brand); }
.feat-card-icon {
  width: 34px; height: 34px; border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  font-size: 17px; flex-shrink: 0;
}
.feat-card strong { font-size: 13px; font-weight: 600; display: block; margin-bottom: 3px; }
.feat-card p { font-size: 12px; color: var(--tx-muted); margin: 0; line-height: 1.5; }

/* How-to steps */
.steps { display: flex; flex-direction: column; }
.step {
  display: flex; gap: 18px;
  padding: 22px 0; border-bottom: 1px solid var(--bd);
}
.step:last-child { border-bottom: none; }
.step-num {
  width: 30px; height: 30px; border-radius: 50%; flex-shrink: 0;
  background: var(--brand); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; margin-top: 2px;
}
.step-body h2 { font-size: 15px; font-weight: 600; border: none; padding: 0; margin-bottom: 8px; }

/* Shortcut grid */
.shortcut-grid {
  display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; margin-top: 8px;
}
.shortcut-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; border-radius: var(--radius);
  border: 1px solid var(--bd); background: var(--bg-subtle);
  font-size: 12px; color: var(--tx-muted);
}

/* Contact form */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block; font-size: 13px; font-weight: 600;
  color: var(--tx-muted); margin-bottom: 6px;
}
.form-group input, .form-group textarea {
  width: 100%; font-size: 14px;
  padding: 9px 12px; border-radius: var(--radius);
  border: 1px solid var(--bd-strong);
  background: var(--bg-surface); color: var(--tx-base);
  outline: none; transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-ring);
}
.form-group textarea { resize: vertical; line-height: 1.6; }
.form-note { font-size: 12px; color: var(--tx-faint); margin-top: 10px; line-height: 1.5; }

/* Alerts */
.alert { padding: 12px 16px; border-radius: var(--radius); font-size: 14px; margin-bottom: 20px; }
.alert-ok  { background: var(--add-bg);  color: var(--add-tx);  border: 1px solid var(--add-word); }
.alert-err { background: var(--del-bg);  color: var(--del-tx);  border: 1px solid var(--del-word); }

/* ══════════════════════════════════════════
   FOOTER
══════════════════════════════════════════ */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--bd);
  margin-top: auto;
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 20px; display: flex; flex-direction: column;
  align-items: center; gap: 12px; text-align: center;
}
.footer-brand {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--tx-muted);
}
.footer-links {
  display: flex; gap: 4px; flex-wrap: wrap; justify-content: center;
}
.footer-links a {
  font-size: 12px; color: var(--tx-faint);
  padding: 2px 8px; border-radius: 4px;
  text-decoration: none; transition: color .12s;
}
.footer-links a:hover { color: var(--tx-muted); }
.footer-copy { font-size: 12px; color: var(--tx-faint); }

/* ══════════════════════════════════════════
   DARK MODE EXPLICIT OVERRIDES
   Fix invisible/low-contrast text on dark backgrounds
══════════════════════════════════════════ */
[data-theme="dark"] .btn-ghost {
  background: var(--bg-muted); color: var(--tx-base); border-color: var(--bd-strong);
}
[data-theme="dark"] .btn-ghost:hover { background: #2c3146; color: #fff; }

[data-theme="dark"] .btn-danger {
  background: rgba(220,38,38,.15); color: #FCA5A5; border-color: rgba(220,38,38,.3);
}
[data-theme="dark"] .btn-danger:hover { background: rgba(220,38,38,.25); }

[data-theme="dark"] .adv-toggle-btn {
  background: var(--bg-muted); color: var(--tx-base); border-color: var(--bd-strong);
}
[data-theme="dark"] .adv-toggle-btn:hover { background: #2c3146; color: #fff; }

/* Selects — force dark colours, browsers often ignore CSS vars on native selects */
[data-theme="dark"] select,
[data-theme="dark"] .tb-select {
  background-color: var(--bg-muted); color: var(--tx-base); border-color: var(--bd-strong);
}

/* Stat bar text */
[data-theme="dark"] .stat-text   { color: var(--tx-muted); }
[data-theme="dark"] .toggle-chip { color: var(--tx-base); }
[data-theme="dark"] .stats-bar   { background: var(--bg-subtle); }
[data-theme="dark"] .adv-toolbar { background: var(--bg-muted); border-color: var(--bd); }

/* Editor pane headers */
[data-theme="dark"] .pane-header { background: var(--bg-muted); }
[data-theme="dark"] .pane-label  { color: var(--tx-base); }

/* Logo + footer text */
[data-theme="dark"] .logo-text     { color: var(--tx-base); }
[data-theme="dark"] .footer-brand  { color: var(--tx-muted); }
[data-theme="dark"] .footer-copy   { color: var(--tx-faint); }
[data-theme="dark"] .footer-links a { color: var(--tx-faint); }
[data-theme="dark"] .footer-links a:hover { color: var(--tx-muted); }

/* Drawer dark mode */
[data-theme="dark"] .mobile-drawer { background: var(--bg-surface); }
[data-theme="dark"] .mobile-drawer a { color: var(--tx-muted); border-color: var(--bd); }
[data-theme="dark"] .mobile-drawer a:hover { color: var(--tx-base); background: var(--bg-subtle); }
[data-theme="dark"] .drawer-close { color: var(--tx-faint); }

/* Hero pill */
[data-theme="dark"] .hero-pill { background: rgba(37,99,235,.2); color: #93b4f8; }
[data-theme="dark"] .hero-pill-dot { background: #93b4f8; }

/* CodeMirror plain editor — ensure readable in dark */
[data-theme="dark"] .CodeMirror {
  background: #1a1d27 !important;
  color: #e8ecf5 !important;
}
[data-theme="dark"] .CodeMirror-gutters {
  background: #141720 !important;
  border-right-color: rgba(255,255,255,.08) !important;
}
[data-theme="dark"] .CodeMirror-linenumber { color: #525c72 !important; }
[data-theme="dark"] .CodeMirror-cursor     { border-left-color: #7c9ee8 !important; }
[data-theme="dark"] .CodeMirror-selected,
[data-theme="dark"] .CodeMirror-focused .CodeMirror-selected { background: rgba(37,99,235,.3) !important; }
[data-theme="dark"] .CodeMirror-placeholder { color: #525c72 !important; }

/* MergeView gap in dark */
[data-theme="dark"] .CodeMirror-merge-gap {
  background: #1a1d27 !important;
  border-color: rgba(255,255,255,.07) !important;
}
/* MergeView gap in dark */
[data-theme="dark"] .CodeMirror-merge-gap {
  background: #1a1d27 !important;
  border-color: rgba(255,255,255,.07) !important;
}
/* Diff chunk backgrounds — must be bright enough to read over Dracula */
[data-theme="dark"] .CodeMirror-merge-r-chunk {
  background: rgba(34, 197, 94, 0.18) !important;  /* green tint — additions */
}
[data-theme="dark"] .CodeMirror-merge-r-chunk-start {
  border-top: 1px solid rgba(34,197,94,.5) !important;
}
[data-theme="dark"] .CodeMirror-merge-r-chunk-end {
  border-bottom: 1px solid rgba(34,197,94,.5) !important;
}
[data-theme="dark"] .CodeMirror-merge-l-chunk {
  background: rgba(239, 68, 68, 0.2) !important;   /* red tint — deletions */
}
[data-theme="dark"] .CodeMirror-merge-l-chunk-start {
  border-top: 1px solid rgba(239,68,68,.5) !important;
}
[data-theme="dark"] .CodeMirror-merge-l-chunk-end {
  border-bottom: 1px solid rgba(239,68,68,.5) !important;
}
/* Changed (both sides) */
[data-theme="dark"] .CodeMirror-merge-r-changed {
  background: rgba(34, 197, 94, 0.28) !important;
}
[data-theme="dark"] .CodeMirror-merge-l-changed {
  background: rgba(239, 68, 68, 0.28) !important;
}
[data-theme="dark"] .CodeMirror-merge-copy { color: var(--tx-muted) !important; }

/* Inline view dark */
[data-theme="dark"] .iv-num { background: var(--bg-subtle); border-color: var(--bd); color: var(--tx-faint); }
[data-theme="dark"] .iv-code { color: var(--tx-base); }

/* Word diff dark */
[data-theme="dark"] .word-diff-out { background: var(--bg-surface); color: var(--tx-base); }

/* FAQ dark */
[data-theme="dark"] .faq-q { color: var(--tx-base); }
[data-theme="dark"] .faq-a { color: var(--tx-muted); }
[data-theme="dark"] .faq-item { border-color: var(--bd); }

/* Content pages dark */
[data-theme="dark"] .page-eyebrow { background: rgba(37,99,235,.2); color: #93b4f8; }
[data-theme="dark"] .feat-card,
[data-theme="dark"] .seo-feat { background: var(--bg-subtle); border-color: var(--bd); }
[data-theme="dark"] .feat-card strong,
[data-theme="dark"] .seo-feat strong { color: var(--tx-base); }
[data-theme="dark"] .step-num { background: var(--brand); }
[data-theme="dark"] .shortcut-item { background: var(--bg-subtle); border-color: var(--bd); color: var(--tx-muted); }
[data-theme="dark"] kbd { background: var(--bg-muted); border-color: var(--bd-strong); color: var(--tx-base); }
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
  background: var(--bg-subtle); color: var(--tx-base); border-color: var(--bd-strong);
}
[data-theme="dark"] .form-group label { color: var(--tx-muted); }

/* ══════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════ */

/* Tablet — hide desktop nav, show hamburger */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .btn-sm.hide-sm { display: none; }
  /* Ensure theme btn + hamburger are always visible on right */
  .header-actions { gap: 6px; }
}

/* Mobile — 680px breakpoint */
@media (max-width: 680px) {
  /* Header */
  .header-inner { padding: 0 12px; gap: 8px; }
  .logo-text { font-size: 13px; }

  /* Hero */
  .tool-hero { padding: 20px 12px 16px; }
  .tool-hero h1 { font-size: 20px; }
  .hero-tagline { font-size: 13px; margin-bottom: 16px; }
  .primary-toolbar { gap: 5px; }

  /* Stats bar — horizontal scroll on mobile */
  .stats-bar {
    flex-direction: column;
    align-items: flex-start;
    padding: 6px 10px;
    gap: 6px;
    overflow-x: visible;
  }
  .stats-left, .stats-right {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    gap: 5px;
    padding-bottom: 2px;
  }
  .stats-right { justify-content: flex-start; }

  /* Editors — stack vertically, each half the viewport */
  .editors-wrap {
    grid-template-columns: 1fr;
    height: auto; /* let content define height on mobile */
  }
  .editor-pane {
    min-height: 45vh;
    border-right: none;
    border-bottom: 1px solid var(--bd);
  }
  .editor-pane:last-child { border-bottom: none; }
  .editor-pane .CodeMirror { height: 45vh !important; }

  /* MergeView on mobile — horizontal scroll */
  .merge-wrap {
    height: 70vh;
    overflow-x: auto; -webkit-overflow-scrolling: touch;
  }
  .CodeMirror-merge { min-width: 600px; }
  .merge-wrap .CodeMirror { height: 70vh !important; }

  /* Inline view mobile */
  .inline-view { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .iv-code { min-width: 0; word-break: break-all; }

  /* Word diff mobile */
  .word-diff-out { padding: 10px 12px; font-size: 12px; }

  /* Content pages */
  .content-wrap { padding: 32px 14px 48px; }
  .page-hero-title { font-size: 22px; }
  .feat-grid { grid-template-columns: 1fr; }
  .seo-features { grid-template-columns: 1fr; }
  .shortcut-grid { grid-template-columns: repeat(2,1fr); }

  /* Steps */
  .step { gap: 12px; }

  /* Advanced toolbar — wrap tightly */
  .adv-toolbar { gap: 4px; padding: 5px 10px; }
}

/* Small mobile — 420px */
@media (max-width: 420px) {
  .logo-text { display: none; } /* show only icon on very small screens */
  .header-inner { padding: 0 10px; }
  .tool-hero h1 { font-size: 18px; }
  .btn { font-size: 11.5px; padding: 5px 9px; }
  .btn-xs { font-size: 10px; padding: 3px 6px; }
  .pane-file-name { display: none; } /* hide long filename on tiny screens */
  .shortcut-grid { grid-template-columns: 1fr; }
}

/* ══════════════════════════════════════════
   DRAG & DROP OVERLAY
══════════════════════════════════════════ */
.editor-pane { position: relative; }

.drop-overlay {
  display: none;
  position: absolute; inset: 0; z-index: 50;
  background: rgba(37,99,235,.08);
  border: 2.5px dashed var(--brand);
  border-radius: var(--radius);
  align-items: center; justify-content: center;
  font-size: 15px; font-weight: 600;
  color: var(--brand);
  pointer-events: none;
  margin: 4px;
}
.editor-pane.drag-over .drop-overlay { display: flex; }
[data-theme="dark"] .drop-overlay {
  background: rgba(37,99,235,.15);
}

/* ══════════════════════════════════════════
   FIND & REPLACE BAR
══════════════════════════════════════════ */
.search-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--bd);
  padding: 5px 12px;
  display: flex; flex-direction: column; gap: 4px;
}
.search-row {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.search-row-label {
  font-size: 11px; font-weight: 600; color: var(--tx-faint);
  text-transform: uppercase; letter-spacing: .04em;
  width: 46px; flex-shrink: 0;
}
.search-input {
  font-family: var(--font-code); font-size: 13px;
  padding: 5px 10px;
  border: 1px solid var(--bd-strong);
  border-radius: var(--radius);
  background: var(--bg-subtle); color: var(--tx-base);
  outline: none; width: 200px; flex-shrink: 0;
  transition: border-color .15s, box-shadow .15s;
}
.search-input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-ring);
}
.search-input.search-no-match { border-color: var(--red); background: #FEF2F2; }
.search-count {
  font-size: 11.5px; color: var(--tx-faint);
  font-family: var(--font-code); white-space: nowrap; min-width: 56px;
}
.search-row-hint {
  font-size: 11.5px; color: var(--tx-faint); font-style: italic;
}
/* Search highlight */
.cm-searching { background: #FCD34D !important; color: #000 !important; border-radius: 2px; }
.cm-searching-current { background: #F59E0B !important; color: #000 !important; outline: 2px solid #D97706; border-radius: 2px; }
[data-theme="dark"] .cm-searching         { background: #854D0E !important; color: #FEF3C7 !important; }
[data-theme="dark"] .cm-searching-current { background: #D97706 !important; color: #fff    !important; outline-color: #F59E0B; }

[data-theme="dark"] .search-bar   { background: var(--bg-subtle); }
[data-theme="dark"] .search-input { background: var(--bg-muted); color: var(--tx-base); }
[data-theme="dark"] .search-input.search-no-match { background: rgba(220,38,38,.15); border-color: #F87171; }

/* ══════════════════════════════════════════
   KEYBOARD SHORTCUT MODAL
══════════════════════════════════════════ */
.shortcut-modal-overlay {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.shortcut-modal {
  background: var(--bg-surface);
  border: 1px solid var(--bd-strong);
  border-radius: var(--radius-xl);
  width: 100%; max-width: 540px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.shortcut-modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--bd);
  background: var(--bg-subtle);
}
.shortcut-modal-title {
  font-size: 14px; font-weight: 700; color: var(--tx-base);
  letter-spacing: -.02em;
}
.shortcut-modal-close {
  background: none; border: none; font-size: 15px;
  color: var(--tx-faint); cursor: pointer; padding: 2px 5px;
  border-radius: 4px; transition: color .12s, background .12s;
}
.shortcut-modal-close:hover { color: var(--tx-base); background: var(--bg-muted); }
.shortcut-modal-body {
  display: grid; grid-template-columns: repeat(3,1fr);
  gap: 0; padding: 16px 20px 20px;
}
.shortcut-group { }
.shortcut-group-title {
  font-size: 10px; font-weight: 700; color: var(--tx-faint);
  text-transform: uppercase; letter-spacing: .06em;
  margin-bottom: 8px; padding-bottom: 4px;
  border-bottom: 1px solid var(--bd);
}
.shortcut-row {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 7px;
}
.shortcut-row kbd {
  font-family: var(--font-code); font-size: 10.5px;
  background: var(--bg-muted); border: 1px solid var(--bd-strong);
  border-radius: 4px; padding: 2px 5px;
  color: var(--tx-base); white-space: nowrap; flex-shrink: 0;
}
.shortcut-row span { font-size: 12px; color: var(--tx-muted); }

[data-theme="dark"] .shortcut-modal { background: var(--bg-surface); }
[data-theme="dark"] .shortcut-modal-header { background: var(--bg-muted); }
[data-theme="dark"] .shortcut-row kbd { background: var(--bg-muted); border-color: var(--bd-strong); color: var(--tx-base); }

/* Wrap button active state */
#wrapBtn.active { background: var(--brand-light); color: var(--brand); border-color: var(--brand); }
[data-theme="dark"] #wrapBtn.active { background: rgba(37,99,235,.2); }

/* Diff nav buttons — disabled when no compare */
#prevDiffBtn:disabled, #nextDiffBtn:disabled { opacity: .4; cursor: not-allowed; }

@media (max-width: 680px) {
  .shortcut-modal-body { grid-template-columns: 1fr; gap: 12px; }
  .search-input { width: 140px; }
}

/* ══════════════════════════════════════════
   INLINE SEARCH BAR (old single-row — kept for reference, replaced above)
══════════════════════════════════════════ */

/* Language page links grid */
.lang-links {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px;
}
.lang-link {
  font-size: 12px; font-weight: 500;
  padding: 4px 12px; border-radius: 20px;
  border: 1px solid var(--bd-strong);
  background: var(--bg-subtle); color: var(--tx-muted);
  text-decoration: none; transition: all .15s;
}
.lang-link:hover {
  background: var(--brand-light); color: var(--brand);
  border-color: var(--brand); text-decoration: none;
}
[data-theme="dark"] .lang-link:hover { background: rgba(37,99,235,.2); }

/* ══════════════════════════════════════════
   COMPARE-ACTIVE HINT BANNER
══════════════════════════════════════════ */
.compare-hint {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px;
  background: var(--brand-light);
  border-bottom: 1px solid rgba(37,99,235,.2);
  font-size: 13px; color: var(--brand);
  line-height: 1.4;
}
.compare-hint svg { flex-shrink: 0; color: var(--brand); }
.compare-hint strong { font-weight: 700; }

[data-theme="dark"] .compare-hint {
  background: rgba(37,99,235,.15);
  border-color: rgba(37,99,235,.25);
  color: #93b4f8;
}
[data-theme="dark"] .compare-hint svg { color: #93b4f8; }

/* ══════════════════════════════════════════
   PRINT
══════════════════════════════════════════ */
@media print {
  .site-header, .stats-bar, .adv-toolbar, .primary-toolbar,
  .pane-actions, .site-footer, .mobile-drawer, .mobile-overlay { display: none !important; }
  .editors-wrap { display: block; }
  .editor-pane { page-break-inside: avoid; }
}