/* ============================================================
   GTPStool — Vercel Geist Remake
   Clean, minimal, fast. Light by default, dark via [data-theme]
   ============================================================ */
:root {
  --gt-bg: #ffffff;
  --gt-bg-soft: #fafafa;
  --gt-bg-subtle: #f4f4f5;
  --gt-card: #ffffff;
  --gt-border: #eaeaea;
  --gt-border-strong: #d4d4d4;
  --gt-text: #171717;
  --gt-text-2: #525252;
  --gt-text-3: #8a8a8a;
  --gt-accent: #0070f3;
  --gt-accent-hover: #0761d1;
  --gt-btn: #171717;
  --gt-btn-text: #ffffff;
  --gt-btn-hover: #2e2e2e;
  --gt-success: #17c964;
  --gt-success-bg: #e8fbf0;
  --gt-danger: #f31260;
  --gt-danger-bg: #fee7ef;
  --gt-warning: #f5a524;
  --gt-warning-bg: #fef3e2;
  --gt-info-bg: #e8f0fe;
  --gt-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --gt-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --gt-r-sm: 6px;
  --gt-r-md: 8px;
  --gt-r-lg: 12px;
  --gt-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --gt-shadow-md: 0 5px 10px rgba(0, 0, 0, 0.12);
  --gt-shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --gt-header-h: 64px;
  --gt-max: 1040px;
  --gt-checker: #f4f4f5;
  color-scheme: light;
}
[data-theme="dark"] {
  --gt-bg: #000000;
  --gt-bg-soft: #0a0a0a;
  --gt-bg-subtle: #111111;
  --gt-card: #0a0a0a;
  --gt-border: #262626;
  --gt-border-strong: #404040;
  --gt-text: #ededed;
  --gt-text-2: #a1a1a1;
  --gt-text-3: #666666;
  --gt-accent: #3291ff;
  --gt-accent-hover: #0070f3;
  --gt-btn: #ededed;
  --gt-btn-text: #000000;
  --gt-btn-hover: #ffffff;
  --gt-success-bg: rgba(23, 201, 100, 0.12);
  --gt-danger-bg: rgba(243, 18, 96, 0.12);
  --gt-warning-bg: rgba(245, 165, 36, 0.12);
  --gt-info-bg: rgba(50, 145, 255, 0.12);
  --gt-checker: #111111;
  color-scheme: dark;
}

/* Legacy aliases so old markup keeps working */
:root {
  --bg-primary: var(--gt-bg);
  --bg-secondary: var(--gt-bg-soft);
  --bg-tertiary: var(--gt-bg-subtle);
  --bg-card: var(--gt-card);
  --accent: var(--gt-text);
  --accent-light: var(--gt-accent);
  --accent-hover: var(--gt-btn-hover);
  --success: var(--gt-success);
  --danger: var(--gt-danger);
  --warning: var(--gt-warning);
  --text-primary: var(--gt-text);
  --text-secondary: var(--gt-text-2);
  --text-tertiary: var(--gt-text-3);
  --border-color: var(--gt-border);
  --border-light: var(--gt-border);
  --radius-xs: var(--gt-r-sm);
  --radius-sm: var(--gt-r-sm);
  --radius-md: var(--gt-r-md);
  --radius-lg: var(--gt-r-lg);
  --shadow-sm: var(--gt-shadow-sm);
  --shadow-md: var(--gt-shadow-md);
  --shadow-lg: var(--gt-shadow-lg);
  --shadow-xl: var(--gt-shadow-lg);
  --transition: all 0.15s ease;
  --font-family: var(--gt-sans);
}
[data-theme="dark"] {
  --accent: #ededed;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--gt-bg) !important;
  color: var(--gt-text) !important;
  font-family: var(--gt-sans) !important;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--gt-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
::selection { background: var(--gt-text); color: var(--gt-bg); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gt-border-strong); border-radius: 8px; border: 2px solid var(--gt-bg); }

/* ============ Navbar (Vercel style) ============ */
.gt-navbar, .vercel-navbar {
  position: sticky; top: 0; z-index: 100;
  height: var(--gt-header-h);
  background: color-mix(in srgb, var(--gt-bg) 80%, transparent) !important;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gt-border) !important;
}
.gt-navbar-inner, .navbar-container {
  max-width: var(--gt-max);
  height: var(--gt-header-h);
  margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 24px;
}
.gt-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 15px; letter-spacing: -0.01em;
  color: var(--gt-text) !important; text-decoration: none !important;
  flex-shrink: 0;
}
.gt-logo-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background: var(--gt-text); color: var(--gt-bg);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 14px;
}
.navbar-brand { display: flex; align-items: center; flex-shrink: 0; }
.gt-nav, .navbar-menu {
  display: flex; align-items: center; gap: 2px;
  flex: 1; margin: 0;
}
.gt-nav a, .navbar-link {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 7px 12px !important;
  border-radius: 6px !important;
  font-size: 13.5px; font-weight: 500;
  color: var(--gt-text-2) !important;
  text-decoration: none !important;
  border: 0 !important; background: transparent !important;
  white-space: nowrap; transition: all 0.15s ease;
}
.gt-nav a:hover, .navbar-link:hover {
  color: var(--gt-text) !important; background: var(--gt-bg-subtle) !important;
}
.gt-nav a.active, .navbar-link.active {
  color: var(--gt-text) !important; background: var(--gt-bg-subtle) !important;
}
.gt-nav-group-label {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--gt-text-3); padding: 8px 12px 4px;
}
.gt-navbar-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.navbar-menu-toggle {
  display: none; background: var(--gt-bg-subtle); border: 1px solid var(--gt-border);
  color: var(--gt-text); border-radius: 6px; padding: 8px 10px; cursor: pointer; font-size: 15px;
}

/* Theme toggle */
.gt-icon-btn {
  width: 32px; height: 32px; border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
  border: 1px solid var(--gt-border); background: var(--gt-card);
  color: var(--gt-text-2); cursor: pointer; font-size: 14px; transition: all 0.15s ease;
  text-decoration: none !important;
}
.gt-icon-btn:hover { color: var(--gt-text); border-color: var(--gt-border-strong); }
.gt-github-btn {
  display: inline-flex; align-items: center; gap: 7px;
  height: 32px; padding: 0 12px; border-radius: 6px;
  font-size: 13px; font-weight: 500; color: var(--gt-text-2) !important;
  border: 1px solid var(--gt-border); background: var(--gt-card); text-decoration: none !important;
}
.gt-github-btn:hover { color: var(--gt-text) !important; border-color: var(--gt-border-strong); text-decoration: none !important; }

/* ============ Layout ============ */
.gt-page, .vercel-main {
  max-width: var(--gt-max);
  margin: 0 auto; padding: 48px 24px 64px;
}
.content-container, .content-grid { display: block; }

/* Hero — Vercel style */
.gt-hero, .page-header {
  margin: 0 0 32px !important; padding: 0 0 32px !important;
  border-bottom: 1px solid var(--gt-border) !important;
}
.page-header-content h1 { font-size: 40px !important; letter-spacing: -0.03em !important; }
.gt-breadcrumb {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px; font-weight: 500;
  border: 1px solid var(--gt-border); border-radius: 999px;
  padding: 4px 12px; color: var(--gt-text-2); background: var(--gt-card);
  margin-bottom: 16px;
}
.gt-breadcrumb .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--gt-success); }
.gt-title {
  margin: 0; font-size: 40px; font-weight: 700; letter-spacing: -0.035em; line-height: 1.1;
  display: flex; align-items: center; gap: 14px;
}
.gt-title .gt-title-icon {
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
  background: var(--gt-text); color: var(--gt-bg);
  display: inline-flex; align-items: center; justify-content: center; font-size: 20px;
}
.gt-subtitle { margin: 12px 0 0; color: var(--gt-text-2); font-size: 15.5px; max-width: 640px; }
.gt-hero-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }

/* Badges / pills */
.gt-pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 500;
  border: 1px solid var(--gt-border); border-radius: 999px;
  padding: 3px 10px; color: var(--gt-text-2); background: var(--gt-card);
}
.gt-pill i { font-size: 11px; }
.gt-pill.green { background: var(--gt-success-bg); border-color: transparent; color: var(--gt-success); }
.gt-pill.blue { background: var(--gt-info-bg); border-color: transparent; color: var(--gt-accent); }

/* ============ Cards ============ */
.gt-card, .content-card {
  background: var(--gt-card) !important;
  border: 1px solid var(--gt-border) !important;
  border-radius: var(--gt-r-lg) !important;
  padding: 0 !important; overflow: hidden;
  box-shadow: var(--gt-shadow-sm);
}
.gt-card:hover, .content-card:hover { border-color: var(--gt-border) !important; box-shadow: var(--gt-shadow-sm); }
.gt-card-pad { padding: 24px; }
.gt-card-header { padding: 20px 24px; border-bottom: 1px solid var(--gt-border); display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.gt-card-title { margin: 0; font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.gt-card-title i { color: var(--gt-text-3); }
.gt-card-desc { margin: 2px 0 0; font-size: 13px; color: var(--gt-text-3); }
.gt-section { padding: 24px; border-bottom: 1px solid var(--gt-border); }
.gt-section:last-child { border-bottom: 0; }
.section-header { margin-bottom: 14px !important; }
.section-header h2, .section-header h3 { color: var(--gt-text) !important; letter-spacing: -0.01em; }
.section-header p { color: var(--gt-text-3) !important; }
.section-divider, hr { height: 1px; background: var(--gt-border) !important; border: 0 !important; margin: 0 !important; }

/* Grid helpers */
.gt-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.gt-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.gt-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.gt-stat {
  border: 1px solid var(--gt-border); border-radius: var(--gt-r-md);
  padding: 14px 16px; background: var(--gt-bg-soft);
}
.gt-stat-label { font-size: 12px; color: var(--gt-text-3); font-weight: 500; }
.gt-stat-value { font-size: 22px; font-weight: 700; letter-spacing: -0.02em; margin-top: 2px; font-variant-numeric: tabular-nums; }
.gt-stat-value.accent { color: var(--gt-accent); }

/* ============ Buttons — Vercel style ============ */
.gt-btn, .btn-vercel, .btn {
  display: inline-flex !important; align-items: center; justify-content: center; gap: 8px;
  height: 40px; padding: 0 16px !important;
  border-radius: var(--gt-r-sm) !important;
  font-size: 13.5px !important; font-weight: 500 !important; font-family: var(--gt-sans) !important;
  cursor: pointer; border: 1px solid transparent !important;
  transition: all 0.15s ease !important; text-decoration: none !important;
  line-height: 1 !important; white-space: nowrap;
}
.gt-btn-primary, .btn-vercel.btn-primary, .btn-primary {
  background: var(--gt-btn) !important; color: var(--gt-btn-text) !important;
  border-color: var(--gt-btn) !important; box-shadow: none !important;
}
.gt-btn-primary:hover, .btn-vercel.btn-primary:hover, .btn-primary:hover {
  background: var(--gt-btn-hover) !important; border-color: var(--gt-btn-hover) !important;
  transform: none !important; box-shadow: none !important; color: var(--gt-btn-text) !important;
}
.gt-btn-secondary, .btn-vercel.btn-secondary, .btn-secondary, .btn-default {
  background: var(--gt-card) !important; color: var(--gt-text) !important;
  border: 1px solid var(--gt-border-strong) !important; box-shadow: var(--gt-shadow-sm) !important;
}
.gt-btn-secondary:hover, .btn-vercel.btn-secondary:hover, .btn-secondary:hover, .btn-default:hover {
  background: var(--gt-bg-soft) !important; color: var(--gt-text) !important; border-color: var(--gt-text-3) !important;
}
.gt-btn-danger, .btn-danger {
  background: var(--gt-danger) !important; color: #fff !important; border-color: var(--gt-danger) !important;
}
.gt-btn-danger:hover, .btn-danger:hover { filter: brightness(0.92); background: var(--gt-danger) !important; color: #fff !important; }
.gt-btn-success, .btn-success {
  background: var(--gt-btn) !important; color: var(--gt-btn-text) !important; border-color: var(--gt-btn) !important;
}
.gt-btn-success:hover, .btn-success:hover { background: var(--gt-btn-hover) !important; color: var(--gt-btn-text) !important; }
.gt-btn-sm { height: 32px; padding: 0 12px !important; font-size: 12.5px !important; }
.gt-btn-lg { height: 48px; padding: 0 24px !important; font-size: 14.5px !important; }
.gt-btn-block { width: 100%; }
.gt-btn:disabled, .btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-sm { height: 32px; font-size: 12.5px !important; }
.btn-tool { background: transparent !important; border: 0 !important; color: var(--gt-text-3) !important; height: auto !important; padding: 6px 8px !important; }
.btn-tool:hover { color: var(--gt-text) !important; background: var(--gt-bg-subtle) !important; }

/* Dropzone button row */
.action-section { margin: 0 !important; }
.action-btn-group { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; align-items: center; }

/* ============ Forms — Vercel style ============ */
.gt-form-sep {
  grid-column: 1 / -1;
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--gt-text-3); padding: 16px 0 8px; margin-top: 4px;
  border-bottom: 1px solid var(--gt-border);
  display: flex; align-items: center; gap: 8px;
}
.gt-form-sep:first-child { padding-top: 0; margin-top: 0; }
.gt-form-sep i { font-size: 11px; }
.gt-label, label, .col-form-label {
  display: block; font-size: 13px !important; font-weight: 500 !important;
  color: var(--gt-text) !important; margin-bottom: 6px !important;
}
.gt-input, .form-control, .custom-select, textarea, select.form-control {
  width: 100%; height: 40px;
  background: var(--gt-card) !important;
  border: 1px solid var(--gt-border-strong) !important;
  border-radius: var(--gt-r-sm) !important;
  color: var(--gt-text) !important;
  font-size: 13.5px !important; padding: 0 12px !important;
  font-family: var(--gt-sans) !important;
  transition: border-color 0.15s ease, box-shadow 0.15s ease !important;
  box-shadow: none !important;
}
textarea { height: auto !important; min-height: 120px; padding: 10px 12px !important; font-family: var(--gt-mono) !important; font-size: 12.5px !important; resize: vertical; }
select.form-control, .custom-select { cursor: pointer; appearance: auto; }
.gt-input:focus, .form-control:focus, .custom-select:focus, textarea:focus {
  outline: none !important;
  border-color: var(--gt-text) !important;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--gt-text) 12%, transparent) !important;
}
.gt-input::placeholder, .form-control::placeholder { color: var(--gt-text-3) !important; }
.form-group { margin-bottom: 0 !important; display: flex; flex-direction: column; }
.form-grid {
  display: grid !important; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)) !important; gap: 12px !important;
}
.form-row-group { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.input-group-text { background: var(--gt-bg-subtle) !important; border: 1px solid var(--gt-border-strong) !important; color: var(--gt-text-2) !important; }
.info-text { color: var(--gt-text-3) !important; font-size: 12.5px !important; display: block; margin-bottom: 8px !important; }
.section-block { margin-bottom: 20px; }
.section-title { font-weight: 600; color: var(--gt-text); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; font-size: 13.5px; }

/* Modern switch (pure CSS) — replaces bootstrap-toggle visuals */
.gt-switch-row {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 16px; border: 1px solid var(--gt-border); border-radius: var(--gt-r-md);
  background: var(--gt-bg-soft); transition: border-color 0.15s ease;
}
.gt-switch-row:hover { border-color: var(--gt-border-strong); }
.gt-switch-text b { display: block; font-size: 13.5px; font-weight: 600; }
.gt-switch-text span { font-size: 12.5px; color: var(--gt-text-3); }
.gt-switch { position: relative; width: 40px; height: 22px; flex-shrink: 0; }
.gt-switch input { opacity: 0; width: 100%; height: 100%; position: absolute; margin: 0; cursor: pointer; z-index: 2; }
.gt-switch .track {
  position: absolute; inset: 0; border-radius: 999px;
  background: var(--gt-border-strong); transition: background 0.15s ease;
}
.gt-switch .track::after {
  content: ""; position: absolute; top: 2px; left: 2px; width: 18px; height: 18px;
  border-radius: 50%; background: #fff; box-shadow: var(--gt-shadow-sm);
  transition: transform 0.15s ease;
}
.gt-switch input:checked + .track { background: var(--gt-accent); }
.gt-switch input:checked + .track::after { transform: translateX(18px); }
[data-theme="dark"] .gt-switch .track::after { background: #fff; }

/* Legacy toggle-option + bootstrap-toggle restyle (compat) */
.toggle-option, .mode-selector { display: flex; flex-direction: column; gap: 10px; }
.toggle-option {
  padding: 14px 16px !important; background: var(--gt-bg-soft) !important;
  border: 1px solid var(--gt-border) !important; border-radius: var(--gt-r-md) !important;
}
.toggle-option:hover { border-color: var(--gt-border-strong) !important; background: var(--gt-bg-soft) !important; }
.bootstrap-toggle { margin: 0; }
.bootstrap-toggle.btn { padding: 0 !important; background: transparent !important; border: 0 !important; height: auto !important; }
.bootstrap-toggle .toggle {
  height: 24px !important; min-width: 66px;
  background: var(--gt-border-strong) !important;
  border-radius: 999px !important; border: 0 !important; padding: 2px !important;
  display: flex !important; align-items: center; overflow: hidden !important;
}
.bootstrap-toggle .toggle .btn {
  border-radius: 999px !important; border: 0 !important; font-size: 10.5px !important;
  font-weight: 600 !important; padding: 0 10px !important; height: 20px !important; min-height: 20px !important;
}
.bootstrap-toggle .toggle-handle { display: none !important; }
.editor-section { display: flex; flex-direction: column; }

/* ============ Tabs — Vercel boxed style ============ */
.gt-tabs {
  display: flex; gap: 6px; padding: 12px 24px;
  border-bottom: 1px solid var(--gt-border); background: var(--gt-card);
  overflow-x: auto;
}
.tab-button {
  background: transparent !important; border: 1px solid transparent !important;
  border-radius: 8px !important;
  color: var(--gt-text-2) !important; padding: 8px 14px !important;
  font-weight: 500 !important; font-size: 13px !important; cursor: pointer;
  display: inline-flex !important; align-items: center; gap: 7px; white-space: nowrap;
  height: auto !important; transition: all 0.13s ease !important;
}
.tab-button i { font-size: 13px; opacity: 0.8; }
.tab-button:hover { color: var(--gt-text) !important; background: var(--gt-bg-subtle) !important; }
.tab-button.active {
  color: var(--gt-text) !important; background: var(--gt-bg-subtle) !important;
  border-color: var(--gt-border-strong) !important; box-shadow: var(--gt-shadow-sm);
  font-weight: 600 !important;
}
.tab-content { padding: 0 !important; }
.nav-tabs { border-bottom: 1px solid var(--gt-border) !important; }
.nav-tabs .nav-link { color: var(--gt-text-2) !important; border: 0 !important; font-size: 13px !important; }
.nav-tabs .nav-link.active { background: var(--gt-text) !important; color: var(--gt-bg) !important; }

/* ============ File / hash / preview blocks ============ */
.gt-file-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: stretch; }
.gt-file-name {
  flex: 1; min-width: 200px; display: flex; align-items: center; gap: 8px;
  padding: 0 12px; min-height: 40px;
  background: var(--gt-bg-soft); border: 1px solid var(--gt-border); border-radius: var(--gt-r-sm);
  font-size: 13px; color: var(--gt-text-2); overflow: hidden;
}
.gt-file-name strong, .gt-file-name .gt-file-text { color: var(--gt-text); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.hash-display {
  display: flex !important; align-items: center; gap: 8px;
  font-family: var(--gt-mono) !important; font-size: 12px !important;
  padding: 10px 12px !important; background: var(--gt-bg-soft) !important;
  border: 1px solid var(--gt-border) !important; border-left: 3px solid var(--gt-text) !important;
  border-radius: var(--gt-r-sm) !important; color: var(--gt-text-2) !important;
  word-break: break-all; margin-top: 10px !important;
}
.gt-hash-actions { display: flex; gap: 8px; margin-top: 10px; }
.gt-preview {
  border: 1px solid var(--gt-border); border-radius: var(--gt-r-md);
  background: repeating-conic-gradient(var(--gt-checker) 0% 25%, transparent 0% 50%) 50% / 20px 20px;
  padding: 16px; min-height: 220px;
  display: flex; align-items: center; justify-content: center; text-align: center;
  overflow: auto;
}
.gt-preview canvas, .gt-preview img { max-width: 100%; border-radius: var(--gt-r-sm); box-shadow: var(--gt-shadow-md); background: #fff; }
.gt-preview-empty { color: var(--gt-text-3); font-size: 13.5px; }
.gt-preview-empty i { font-size: 36px; display: block; margin-bottom: 10px; opacity: 0.4; }
#tile_div, #canvas_result_div, #loaded_tile_preview_div, #single_tile_div {
  background: repeating-conic-gradient(var(--gt-checker) 0% 25%, transparent 0% 50%) 50% / 20px 20px !important;
  border: 1px solid var(--gt-border) !important; border-radius: var(--gt-r-md) !important;
  box-sizing: border-box;
}
/* Canvas holders never exceed the viewport height (JS math reads inline style, unaffected) */
#tile_div { max-height: 72vh; max-height: 72dvh; }
#loaded_tile_preview_div { max-height: 60vh; max-height: 60dvh; }
#canvas_result_div { max-height: 62vh; max-height: 62dvh; }
#tile_image_canvas, #image_single_tile, #canvas_result, #loaded_tile_preview { display: block; image-rendering: pixelated; }

/* Dropzone */
.gt-dropzone, #drop_zone_create_tile {
  border: 1.5px dashed var(--gt-border-strong);
  border-radius: var(--gt-r-lg);
  background: var(--gt-bg-soft);
  color: var(--gt-text-2);
  padding: 32px 24px; text-align: center; cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.gt-dropzone:hover, #drop_zone_create_tile:hover {
  border-color: var(--gt-text); background: var(--gt-card); color: var(--gt-text);
}
#drop_zone_create_tile.dragover { border-color: var(--gt-accent); background: var(--gt-info-bg); }
#drop_zone_preview img { border-radius: var(--gt-r-sm); border: 1px solid var(--gt-border); }

/* Tooltip */
#tooltip {
  background: var(--gt-text) !important; color: var(--gt-bg) !important;
  border: 0 !important; border-radius: 6px !important; font-size: 12px !important;
  box-shadow: var(--gt-shadow-md) !important; padding: 6px 10px !important;
}

/* ============ Tables (Vercel clean) ============ */
.table-container { width: 100%; overflow-x: auto; border: 1px solid var(--gt-border); border-radius: var(--gt-r-md); }
/* hide empty table shell before data loads */
.table-container:has(> table.d-none) { display: none; }
.vercel-table, .table {
  width: 100% !important; border-collapse: collapse !important; font-size: 13px !important;
  color: var(--gt-text-2) !important; margin: 0 !important;
}
.vercel-table thead, .table thead th {
  background: var(--gt-bg-soft) !important;
}
.vercel-table th, .table thead th {
  padding: 10px 12px !important; text-align: left !important; font-weight: 600 !important;
  font-size: 11.5px !important; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--gt-text-3) !important; border-bottom: 1px solid var(--gt-border) !important; border-top: 0 !important;
}
.vercel-table td, .table tbody td {
  padding: 10px 12px !important; border-bottom: 1px solid var(--gt-border) !important;
  color: var(--gt-text-2) !important; vertical-align: middle;
}
.vercel-table tbody tr:hover, .table-hover tbody tr:hover { background: var(--gt-bg-soft) !important; }
.dataTables_wrapper { padding: 16px; }
.dataTables_wrapper .row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 0 0 10px; }
.dataTables_wrapper .row:last-child { margin: 10px 0 0; }
.dataTables_wrapper .col-sm-12, .dataTables_wrapper .col-md-5,
.dataTables_wrapper .col-md-6, .dataTables_wrapper .col-md-7 {
  flex: 1 1 220px; min-width: 0; max-width: 100%; padding: 0;
}
.dataTables_wrapper .dataTables_filter { text-align: right; }
.dataTables_wrapper .dataTables_filter label { display: inline-flex; align-items: center; gap: 8px; margin: 0; }
.dataTables_wrapper .dataTables_info { color: var(--gt-text-3); font-size: 12.5px; padding-top: 6px; }
.dataTables_wrapper .dt-buttons { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.dataTables_wrapper .dt-buttons .btn { height: 34px; font-size: 12.5px !important; box-shadow: var(--gt-shadow-sm); }
.dataTables_wrapper .dataTables_filter input { height: 34px; min-width: 220px; }
td.dataTables_empty { text-align: center !important; color: var(--gt-text-3) !important; padding: 28px 12px !important; }
/* DataTables scroll frame becomes the bordered card (container border off to avoid double frame) */
.table-container:has(.dataTables_scroll) { border: 0; border-radius: 0; overflow: visible; }
.dataTables_scrollHead { border: 1px solid var(--gt-border); border-bottom: 0; border-radius: var(--gt-r-md) var(--gt-r-md) 0 0; overflow: hidden; background: var(--gt-bg-soft); }
.dataTables_scrollBody { border: 1px solid var(--gt-border); border-radius: 0 0 var(--gt-r-md) var(--gt-r-md); background: var(--gt-card); }
/* Pagination — Vercel pill buttons */
.dataTables_wrapper .dataTables_paginate { text-align: right; }
.dataTables_wrapper .pagination { display: flex; gap: 6px; justify-content: flex-end; align-items: center; margin: 0; padding: 0; list-style: none; flex-wrap: wrap; }
.dataTables_wrapper .pagination .page-item { display: inline-flex; }
.page-link {
  min-width: 32px; height: 32px; padding: 0 10px !important;
  display: inline-flex !important; align-items: center; justify-content: center; gap: 6px;
  background: var(--gt-card) !important; border: 1px solid var(--gt-border) !important;
  border-radius: 6px !important; color: var(--gt-text-2) !important;
  font-size: 12.5px !important; font-weight: 500 !important; line-height: 1 !important;
  box-shadow: var(--gt-shadow-sm); transition: all 0.13s ease !important;
}
.paginate_button.previous .page-link, .paginate_button.next .page-link { padding: 0 13px !important; }
.page-item:not(.disabled):not(.active) .page-link:hover {
  color: var(--gt-text) !important; border-color: var(--gt-border-strong) !important;
  background: var(--gt-bg-subtle) !important;
}
.page-item.active .page-link {
  background: var(--gt-btn) !important; border-color: var(--gt-btn) !important;
  color: var(--gt-btn-text) !important; font-weight: 600 !important;
}
.page-item.disabled .page-link { opacity: 0.35 !important; cursor: not-allowed !important; box-shadow: none !important; }
.page-link:focus { outline: none !important; border-color: var(--gt-text) !important; }
.vercel-table .btn, .table .btn { height: 32px; padding: 0 12px !important; font-size: 12px !important; }
.dataTables_filter input, .dataTables_length select {
  background: var(--gt-card) !important; border: 1px solid var(--gt-border-strong) !important;
  border-radius: 6px !important; color: var(--gt-text) !important; padding: 6px 10px !important;
}

/* Badges */
.badge { padding: 3px 8px !important; font-size: 11px !important; font-weight: 600 !important; border-radius: 999px !important; }
.badge-danger { background: var(--gt-danger-bg) !important; color: var(--gt-danger) !important; }
.badge-success { background: var(--gt-success-bg) !important; color: var(--gt-success) !important; }
.badge-primary { background: var(--gt-info-bg) !important; color: var(--gt-accent) !important; }

/* ============ Modal — Vercel dialog ============ */
.modal-content {
  background: var(--gt-card) !important; border: 1px solid var(--gt-border) !important;
  border-radius: var(--gt-r-lg) !important; box-shadow: var(--gt-shadow-lg) !important;
}
.modal-header {
  background: var(--gt-card) !important; border-bottom: 1px solid var(--gt-border) !important;
  padding: 16px 20px !important; flex-shrink: 0;
}
.modal-header .modal-title, .modal-title { color: var(--gt-text) !important; font-weight: 600 !important; font-size: 15px !important; }
.modal-header .close, button.close {
  color: var(--gt-text-3) !important; opacity: 1 !important; text-shadow: none !important;
  background: var(--gt-bg-subtle) !important; border: 1px solid var(--gt-border) !important;
  border-radius: 6px !important; width: 28px; height: 28px; font-size: 16px !important;
  display: inline-flex; align-items: center; justify-content: center; padding: 0 !important; margin: 0 !important;
}
.modal-header .close:hover, button.close:hover { color: var(--gt-text) !important; border-color: var(--gt-border-strong) !important; }
.modal-body { padding: 20px !important; color: var(--gt-text-2) !important; }
.modal-footer {
  border-top: 1px solid var(--gt-border) !important; padding: 14px 20px !important;
  background: var(--gt-bg-soft) !important; border-radius: 0 0 var(--gt-r-lg) var(--gt-r-lg) !important;
  display: flex; justify-content: flex-end; gap: 8px; flex-shrink: 0;
}
.modal-backdrop.show { opacity: 1 !important; background: rgba(0, 0, 0, 0.5) !important; backdrop-filter: blur(2px); }

/* ============ Footer — Vercel style ============ */
.gt-footer, .vercel-footer {
  border-top: 1px solid var(--gt-border) !important;
  background: var(--gt-bg) !important;
  padding: 32px 24px !important; margin-top: 64px !important; text-align: left !important;
}
.gt-footer-inner { max-width: var(--gt-max); margin: 0 auto; display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.gt-footer-brand { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--gt-text-2); }
.gt-footer-links { display: flex; gap: 16px; font-size: 13px; }
.gt-footer-links a { color: var(--gt-text-2) !important; text-decoration: none !important; }
.gt-footer-links a:hover { color: var(--gt-text) !important; }

/* ============ CodeMirror / SweetAlert compat ============ */
.CodeMirror {
  border: 1px solid var(--gt-border) !important; border-radius: var(--gt-r-md) !important;
  font-family: var(--gt-mono) !important; font-size: 12.5px !important; height: 220px !important;
}
.swal2-popup {
  background: var(--gt-card) !important; border: 1px solid var(--gt-border) !important;
  border-radius: var(--gt-r-lg) !important; box-shadow: var(--gt-shadow-lg) !important;
  color: var(--gt-text) !important;
}
.swal2-title { color: var(--gt-text) !important; }
.swal2-html-container { color: var(--gt-text-2) !important; }
.swal2-styled.swal2-confirm { background: var(--gt-text) !important; color: var(--gt-bg) !important; border-radius: 6px !important; }
.swal2-styled.swal2-cancel { background: var(--gt-card) !important; color: var(--gt-text) !important; border: 1px solid var(--gt-border-strong) !important; border-radius: 6px !important; }

/* Mouse log */
#mouse_event_log .card { border-left: 3px solid var(--gt-text) !important; }
#mouse_event_plaintext, #mouse_event_action { font-family: var(--gt-mono); font-size: 12px; color: var(--gt-text-2); }

/* Animations */
@keyframes gtFadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.gt-anim { animation: gtFadeUp 0.4s ease both; }
.gt-anim-1 { animation-delay: 0.05s; } .gt-anim-2 { animation-delay: 0.1s; } .gt-anim-3 { animation-delay: 0.15s; }
.animate-fade-in { animation: gtFadeUp 0.3s ease both; }
.animate-slide-up { animation: gtFadeUp 0.35s ease both; }

/* Utility */
.text-accent { color: var(--gt-accent) !important; }
.text-success { color: var(--gt-success) !important; }
.text-danger { color: var(--gt-danger) !important; }
.text-muted { color: var(--gt-text-3) !important; }
.d-none { display: none !important; }

/* Tool home cards */
.gt-tools-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 24px; }
.gt-tool-card {
  display: block; border: 1px solid var(--gt-border); border-radius: var(--gt-r-md);
  padding: 16px; background: var(--gt-card); color: var(--gt-text) !important; text-decoration: none !important;
  transition: all 0.15s ease;
}
.gt-tool-card:hover { border-color: var(--gt-border-strong); box-shadow: var(--gt-shadow-md); text-decoration: none !important; transform: translateY(-1px); }
.gt-tool-card.active { border-color: var(--gt-text); box-shadow: var(--gt-shadow-sm); }
.gt-tool-card .t-icon {
  width: 32px; height: 32px; border-radius: 8px; background: var(--gt-bg-subtle);
  display: inline-flex; align-items: center; justify-content: center; font-size: 15px; margin-bottom: 10px;
  color: var(--gt-text);
}
.gt-tool-card b { display: block; font-size: 13.5px; }
.gt-tool-card span { font-size: 12.5px; color: var(--gt-text-3); }

/* Steps */
.gt-steps { display: flex; align-items: center; gap: 8px; margin: 0 0 16px; font-size: 12.5px; color: var(--gt-text-3); }
.gt-steps .step { display: inline-flex; align-items: center; gap: 6px; }
.gt-steps .n {
  width: 20px; height: 20px; border-radius: 50%; background: var(--gt-text); color: var(--gt-bg);
  font-size: 11px; font-weight: 700; display: inline-flex; align-items: center; justify-content: center;
}

/* ============ Modal scaffold (Bootstrap JS without Bootstrap CSS) ============ */
.modal { position: fixed; inset: 0; z-index: 1050; display: none; overflow-x: hidden; overflow-y: auto; outline: 0; }
.modal.show { display: flex !important; align-items: center; justify-content: center; align-items: safe center; overflow-y: auto; padding: 28px 16px; }
.modal.fade .modal-dialog { transition: transform 0.2s ease, opacity 0.2s ease; transform: translateY(12px); opacity: 0; }
.modal.show .modal-dialog { transform: none; opacity: 1; }
.modal-dialog { position: relative; width: min(560px, 100%); max-width: none; margin: 0; padding: 0; pointer-events: none; flex-shrink: 0; }
.modal-dialog.modal-lg { width: min(920px, 100%); }
.modal-dialog.modal-xl { width: min(1024px, 100%); }
.modal-dialog-centered { display: block; min-height: 0; }
.modal-body { max-height: calc(100vh - 240px); max-height: calc(100dvh - 240px); overflow-y: auto; }
.modal-content { pointer-events: auto; width: 100%; min-width: 0; display: flex; flex-direction: column; max-height: 100%; }
.modal-open { overflow: hidden; }
.modal-backdrop { position: fixed; inset: 0; z-index: 1040; background: rgba(0,0,0,.5); backdrop-filter: blur(2px); }
.modal-backdrop.fade { opacity: 0; } .modal-backdrop.show { opacity: 1; }

/* ============ App sidebar layout (navbar removed) ============ */
.gt-sidebar {
  position: fixed; inset: 0 auto 0 0; width: 264px; z-index: 300;
  background: var(--gt-bg-soft); border-right: 1px solid var(--gt-border);
  display: flex; flex-direction: column;
  transition: width 0.2s ease, transform 0.25s ease;
}
.gt-side-brand {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 14px 14px 18px;
  border-bottom: 1px solid var(--gt-border);
  margin-bottom: 6px;
}
.gt-side-brand .gt-logo { font-size: 15px; }
/* Prominent top collapse toggle — dark button, white icon */
.gt-side-toggle {
  width: 36px; height: 36px; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px; border: 1px solid #333;
  background: #171717; color: #fff;
  font-size: 14px; cursor: pointer;
  box-shadow: var(--gt-shadow-sm);
  transition: background 0.15s ease, transform 0.1s ease;
}
.gt-side-toggle:hover { background: #2e2e2e; color: #fff; }
.gt-side-toggle:active { transform: scale(0.94); }
.gt-side-toggle i { transition: transform 0.2s ease; }
[data-theme="light"] .gt-side-toggle { box-shadow: var(--gt-shadow-sm); }
.gt-side-scroll { flex: 1; overflow-y: auto; padding-bottom: 12px; min-height: 0; }
.gt-side-group {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--gt-text-3); padding: 16px 22px 6px; white-space: nowrap;
}
.gt-side-nav { display: flex; flex-direction: column; gap: 2px; padding: 0 12px; }
.gt-side-nav a {
  display: flex; align-items: center; gap: 11px;
  padding: 8px 12px; border-radius: 8px;
  font-size: 13.5px; font-weight: 500;
  color: var(--gt-text-2) !important; text-decoration: none !important;
  border-left: 2px solid transparent;
  transition: background 0.13s ease, color 0.13s ease;
  white-space: nowrap;
}
.gt-side-nav a i { width: 18px; text-align: center; font-size: 14px; flex-shrink: 0; }
.gt-side-nav a:hover { background: var(--gt-bg-subtle); color: var(--gt-text) !important; }
.gt-side-nav a.active { background: var(--gt-bg-subtle); color: var(--gt-text) !important; border-left-color: var(--gt-text); }
.gt-side-foot {
  padding: 12px; border-top: 1px solid var(--gt-border);
  display: flex; align-items: center; gap: 8px;
}
.gt-side-foot .gt-github-btn { flex: 1; justify-content: center; min-width: 0; }
.gt-side-foot .gt-foot-meta { font-size: 11px; color: var(--gt-text-3); text-align: center; padding: 8px 4px 0; width: 100%; }
.gt-side-overlay {
  position: fixed; inset: 0; z-index: 250; background: rgba(0,0,0,0.5);
  opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
}
.gt-wrap { margin-left: 264px; min-height: 100vh; min-width: 0; display: flex; flex-direction: column; transition: margin 0.2s ease; }
.gt-wrap .gt-page { width: 100%; min-width: 0; }
.gt-card, .content-card { min-width: 0; }
.gt-wrap .gt-footer { margin-top: auto; }
.gt-topbar {
  display: none; position: sticky; top: 0; z-index: 200;
  height: 56px; padding: 0 16px;
  align-items: center; gap: 12px;
  background: color-mix(in srgb, var(--gt-bg) 82%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gt-border);
}
.gt-topbar .gt-logo { font-size: 14.5px; }
.gt-topbar .spacer { flex: 1; }

/* Desktop collapsed (icon rail) */
body.side-collapsed .gt-sidebar { width: 78px; }
body.side-collapsed .gt-wrap { margin-left: 78px; }
body.side-collapsed .gt-side-brand { justify-content: center; padding: 16px 8px 14px; }
body.side-collapsed .gt-side-brand .gt-logo { display: none; }
body.side-collapsed .gt-side-group { text-align: center; padding: 14px 4px 6px; font-size: 0; }
body.side-collapsed .gt-side-group::after { content: "···"; font-size: 12px; color: var(--gt-text-3); letter-spacing: 2px; }
body.side-collapsed .gt-side-nav { padding: 0 10px; }
body.side-collapsed .gt-side-nav a { justify-content: center; padding: 10px 0; }
body.side-collapsed .gt-side-nav a span { display: none; }
body.side-collapsed .gt-side-foot { flex-direction: column; align-items: center; }
body.side-collapsed .gt-side-foot .gt-github-btn { width: 100%; padding: 0; }
body.side-collapsed .gt-side-foot .gt-github-btn span { display: none; }
body.side-collapsed .gt-side-foot .gt-foot-meta { display: none; }

/* ============ SPA shell (iframe viewport, no page reloads) ============ */
.gt-shell-wrap { height: 100vh; height: 100dvh; overflow: hidden; }
.gt-frame-head {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 24px; border-bottom: 1px solid var(--gt-border);
  background: var(--gt-bg); flex-shrink: 0;
}
.gt-frame-head .crumb { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--gt-text-3); min-width: 0; }
.gt-frame-head .crumb b { color: var(--gt-text); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.gt-frame-head .spacer { flex: 1; }
.gt-frame-wrap { position: relative; flex: 1; min-height: 0; background: var(--gt-bg); }
#toolFrame { width: 100%; height: 100%; border: 0; display: block; background: var(--gt-bg); transition: opacity 0.18s ease; }
#toolFrame.fading { opacity: 0; }
.gt-frame-loader {
  position: absolute; inset: 0; z-index: 5; display: none;
  padding: 48px 24px; max-width: var(--gt-max); margin: 0 auto;
  background: var(--gt-bg);
}
.gt-frame-loader.show { display: block; }
.gt-skel { border-radius: 8px; background: linear-gradient(90deg, var(--gt-bg-subtle) 25%, var(--gt-border) 50%, var(--gt-bg-subtle) 75%); background-size: 200% 100%; animation: gtShimmer 1.1s infinite linear; }
@keyframes gtShimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }

/* ============ Visitor metrics page ============ */
.gt-met-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 6px; }
.gt-met-stat { border: 1px solid var(--gt-border); border-radius: 8px; padding: 12px 14px; background: var(--gt-bg-soft); min-width: 0; }
.gt-met-stat b { display: block; font-size: 21px; font-weight: 700; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.gt-met-stat span { font-size: 12px; color: var(--gt-text-3); }
.gt-met-h { margin: 20px 0 10px; font-size: 13px; font-weight: 600; }
.gt-met-h small { color: var(--gt-text-3); font-weight: 400; }
#gtm-chart { width: 100%; display: block; }
.gt-met-note { font-size: 12px; color: var(--gt-text-3); margin: 12px 0 0; }
.gt-met-note b { color: var(--gt-text); }
@media (max-width: 560px) {
  .gt-met-stats { grid-template-columns: 1fr 1fr; }
}

/* ============ Embed mode (tool inside shell) ============ */
body.embed .gt-sidebar, body.embed .gt-topbar, body.embed .gt-footer, body.embed .gt-side-overlay { display: none !important; }
body.embed .gt-wrap { margin-left: 0; min-height: 0; }
body.embed .gt-page, body.embed .vercel-main { padding: 28px 24px 40px; }
html.embed body { background: var(--gt-bg); }

/* Responsive */
@media (max-width: 900px) {
  .gt-tools-grid { grid-template-columns: 1fr 1fr; }
  .gt-grid-3, .gt-grid-4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .gt-sidebar { transform: translateX(-105%); width: 280px !important; max-width: 85vw; }
  body.side-open { overflow: hidden; }
  body.side-open .gt-sidebar { transform: none; box-shadow: var(--gt-shadow-lg); }
  body.side-open .gt-side-overlay { opacity: 1; pointer-events: auto; }
  body.side-collapsed .gt-sidebar { width: 280px !important; }
  body.side-collapsed .gt-side-brand .gt-logo span:last-child,
  body.side-collapsed .gt-side-nav a span,
  body.side-collapsed .gt-side-foot .gt-github-btn span,
  body.side-collapsed .gt-side-foot .gt-foot-meta { display: revert; }
  body.side-collapsed .gt-side-nav a { justify-content: flex-start; padding: 8px 12px; }
  body.side-collapsed .gt-side-group { font-size: 11px; }
  body.side-collapsed .gt-side-group::after { content: none; }
  body.side-collapsed .gt-side-foot { grid-template-columns: auto 1fr; justify-items: stretch; }
  .gt-side-toggle { display: none; }
  .gt-wrap, body.side-collapsed .gt-wrap { margin-left: 0; }
  .gt-topbar { display: flex; }
  .gt-topbar #menuToggle { width: 38px; height: 38px; font-size: 16px; border-color: var(--gt-border-strong); }
  .gt-shell-wrap { height: calc(100vh - 57px); height: calc(100dvh - 57px); }
  .gt-frame-head { padding: 10px 16px; }
  .gt-frame-head .gt-icon-btn { width: 36px; height: 36px; }
  body.embed .gt-page, body.embed .vercel-main { padding: 20px 16px 32px; }
}
@media (max-width: 1200px) {
  .gt-page, .vercel-main { padding: 36px 20px 56px; }
}
@media (max-width: 480px) {
  .gt-page, .vercel-main { padding: 20px 12px 40px !important; }
  .gt-title, .page-header-content h1 { font-size: 24px !important; }
  .gt-title .gt-title-icon { width: 36px; height: 36px; font-size: 16px; border-radius: 10px; }
  .gt-subtitle { font-size: 13.5px; }
  .gt-frame-head .crumb span { display: none; }
  .gt-frame-head { gap: 8px; }
  .dataTables_wrapper { padding: 12px; }
  .dataTables_wrapper .dataTables_filter, .dataTables_wrapper .dataTables_length { text-align: left; }
  .dataTables_wrapper .dataTables_filter input { width: 100%; min-width: 0; margin: 4px 0 0; }
  .dataTables_wrapper .pagination { justify-content: flex-start; }
  .dataTables_wrapper .dataTables_info { padding-top: 0; }
  .modal.show { padding: 12px; }
  .modal-dialog, .modal-dialog.modal-lg, .modal-dialog.modal-xl { width: 100%; margin: 0; }
  .modal-body { max-height: calc(100dvh - 200px); }
}
@media (max-width: 768px) {
  .navbar-menu-toggle { display: inline-flex !important; }
  .navbar-menu, .gt-nav {
    position: absolute; top: var(--gt-header-h); left: 0; right: 0;
    background: var(--gt-bg) !important; flex-direction: column !important; align-items: stretch !important;
    border-bottom: 1px solid var(--gt-border);
    max-height: 0; overflow: hidden; transition: max-height 0.25s ease; gap: 0 !important;
    padding: 0 !important;
  }
  .navbar-menu.active { max-height: 480px; overflow-y: auto; }
  .navbar-link, .gt-nav a { width: 100%; border-radius: 0 !important; padding: 13px 24px !important; }
  .navbar-container, .gt-navbar-inner { position: relative; }
  .gt-page, .vercel-main { padding: 28px 16px 48px !important; }
  .gt-title, .page-header-content h1 { font-size: 28px !important; }
  .gt-card-pad, .gt-section { padding: 16px !important; }
  .gt-tabs { padding: 0 16px; }
  .gt-grid-2, .gt-grid-3, .gt-grid-4, .gt-tools-grid { grid-template-columns: 1fr !important; }
  .gt-file-row { flex-direction: column; }
  .gt-navbar-actions .gt-github-btn span { display: none; }
}