/* ═══════════════════════════════════════════════════
   DevToolsBox — Design System v2
   Inspired by: Linear · Vercel · Raycast · Stripe
   ═══════════════════════════════════════════════════ */

/* ── Design Tokens ────────────────────────────── */
:root {
  /* Colors */
  --accent: #5b5af7;
  --accent-glow: rgba(91, 90, 247, 0.15);
  --accent-soft: #f4f3ff;
  --success: #00c853;
  --warning: #f5a623;
  --danger: #ff3b30;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Menlo', 'Consolas', monospace;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
[data-theme="light"], :root {
  --bg: #fafafa;
  --bg-secondary: #f4f4f5;
  --surface: #ffffff;
  --surface-hover: #f9f9fb;
  --border: #e6e6eb;
  --border-strong: #d4d4d8;
  --text: #18181b;
  --text-secondary: #71717a;
  --text-tertiary: #a1a1aa;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.12);
  --gradient-hero: linear-gradient(135deg, #5b5af7 0%, #8b5cf6 50%, #6366f1 100%);
  --gradient-card: linear-gradient(135deg, #5b5af7, #8b5cf6);
  --glass-bg: rgba(255,255,255,0.72);
}

/* Dark Theme */
[data-theme="dark"] {
  --bg: #09090b;
  --bg-secondary: #18181b;
  --surface: #151518;
  --surface-hover: #1a1a1f;
  --border: #27272a;
  --border-strong: #3f3f46;
  --text: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.7);
  --gradient-hero: linear-gradient(135deg, #818cf8 0%, #a78bfa 50%, #6366f1 100%);
  --gradient-card: linear-gradient(135deg, #818cf8, #a78bfa);
  --glass-bg: rgba(20,20,25,0.8);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #09090b;
    --bg-secondary: #18181b;
    --surface: #151518;
    --surface-hover: #1a1a1f;
    --border: #27272a;
    --border-strong: #3f3f46;
    --text: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
    --shadow-xl: 0 24px 64px rgba(0,0,0,0.7);
    --gradient-hero: linear-gradient(135deg, #818cf8 0%, #a78bfa 50%, #6366f1 100%);
    --gradient-card: linear-gradient(135deg, #818cf8, #a78bfa);
    --glass-bg: rgba(20,20,25,0.8);
  }
}

/* ── Reset & Base ─────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* Subtle grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    radial-gradient(circle, var(--border) 0.5px, transparent 0.5px);
  background-size: 24px 24px;
  opacity: 0.4;
  mask-image: linear-gradient(to bottom, transparent 0%, black 15%, black 85%, transparent 100%);
}

/* ── Typography ───────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 650;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ── Navigation Bar ───────────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}

.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.03em;
  transition: opacity var(--transition);
}
.navbar-brand:hover { opacity: 0.8; }

.navbar-brand .brand-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-card);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: #fff;
  box-shadow: 0 2px 8px var(--accent-glow);
}

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

.navbar-links a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.navbar-links a:hover { color: var(--text); background: var(--bg-secondary); }
.navbar-links a.active { color: var(--accent); background: var(--accent-soft); }

.theme-toggle {
  margin-left: 12px;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ── Container ────────────────────────────────── */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Hero ─────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 80px 24px 64px;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px 4px 6px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--surface);
  margin-bottom: 24px;
  animation: fadeInUp 0.6s ease;
}
.hero-badge .badge-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: #fff;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { box-shadow: 0 0 0 8px transparent; }
}

.hero h1 {
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 20px;
  animation: fadeInUp 0.6s ease 0.1s both;
}
.hero h1 .gradient-text {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 32px;
  line-height: 1.6;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  animation: fadeInUp 0.6s ease 0.3s both;
}
.hero-stat {
  text-align: center;
}
.hero-stat .stat-number {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.hero-stat .stat-label {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Trust Strip ──────────────────────────────── */
.trust-strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--text-tertiary);
  font-size: 13px;
  font-weight: 500;
}
.trust-strip .trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: 100px;
  background: var(--bg-secondary);
}
.trust-strip .trust-icon { font-size: 16px; }

/* ── Section Headers ──────────────────────────── */
.section-header {
  text-align: center;
  margin: 64px 0 32px;
}
.section-header h2 {
  font-size: 28px;
  font-weight: 750;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}
.section-header p {
  color: var(--text-secondary);
  font-size: 16px;
}

/* ── Tool Grid ────────────────────────────────── */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
  padding-bottom: 24px;
}

.tool-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-decoration: none;
  color: var(--text);
  transition: all 250ms cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
  isolation: isolate;
}
.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity 300ms ease;
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}
.tool-card:hover::before { opacity: 0.03; }
.tool-card:hover .card-arrow {
  opacity: 1;
  transform: translateX(0);
}

.tool-card .card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
  transition: transform var(--transition);
}
.tool-card:hover .card-icon { transform: scale(1.08); }

.tool-card .card-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  background: #dcfce7;
  color: #166534;
}
[data-theme="dark"] .tool-card .card-badge {
  background: rgba(0,200,83,0.15);
  color: #4ade80;
}

.tool-card h3 {
  font-size: 18px;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.tool-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.tool-card .card-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-6px);
  transition: all var(--transition);
}

/* ── Ad Slots ─────────────────────────────────── */
.ad-slot {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 13px;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 32px 0;
  transition: all var(--transition);
  letter-spacing: 0.01em;
}
.ad-slot:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

/* ── Affiliate / Recommend ────────────────────── */
.affiliate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}
.affiliate-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  transition: all 250ms cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.affiliate-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}
.affiliate-card .aff-icon {
  font-size: 28px;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
}
.affiliate-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}
.affiliate-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.affiliate-card .aff-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 100px;
  margin-top: 8px;
  background: rgba(0,200,83,0.1);
  color: #008236;
}
[data-theme="dark"] .affiliate-card .aff-tag {
  background: rgba(0,200,83,0.12);
  color: #4ade80;
}

/* ── Sponsorship ──────────────────────────────── */
.sponsor-section {
  background: linear-gradient(135deg, var(--accent-soft), var(--surface));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  padding: 36px 24px;
  text-align: center;
  margin: 32px 0;
  position: relative;
  overflow: hidden;
}
.sponsor-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 50% 0%, var(--accent-glow), transparent 60%);
  opacity: 0.5;
  pointer-events: none;
}
.sponsor-section h3 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  position: relative;
}
.sponsor-section > p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  position: relative;
}
.sponsor-qrcodes {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}
.sponsor-qr {
  text-align: center;
  transition: transform var(--transition);
}
.sponsor-qr:hover { transform: scale(1.04); }
.sponsor-qr img {
  width: 140px;
  height: 140px;
  border-radius: var(--radius);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition);
}
.sponsor-qr:hover img { box-shadow: var(--shadow-lg); }
.sponsor-qr span {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-top: 8px;
  color: var(--text-secondary);
}

/* ── Tool Page Layout ─────────────────────────── */
.tool-page {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px 64px;
}
.tool-page .tool-header {
  text-align: center;
  margin-bottom: 36px;
}
.tool-page .tool-header h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 8px;
}
.tool-page .tool-header p {
  font-size: 16px;
  color: var(--text-secondary);
}

.tool-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  transition: border-color var(--transition);
}
.tool-panel:focus-within { border-color: var(--accent); }

.tool-panel label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Buttons ──────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px var(--accent-glow);
}
.btn-primary:hover { filter: brightness(1.1); box-shadow: 0 4px 16px var(--accent-glow); }
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-secondary); border-color: var(--border-strong); }
.btn-success {
  background: var(--success);
  color: #fff;
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--bg-secondary); color: var(--text); }

/* ── Form Elements ────────────────────────────── */
input[type="text"],
input[type="number"],
input[type="url"],
input[type="email"],
textarea,
select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font-mono);
  background: var(--bg);
  color: var(--text);
  transition: all var(--transition);
  outline: none;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
textarea { resize: vertical; min-height: 180px; }
::placeholder { color: var(--text-tertiary); }

/* ── Code Output ──────────────────────────────── */
.code-output {
  background: #1a1a2e;
  color: #e4e4e7;
  padding: 18px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 420px;
  overflow-y: auto;
  border: 1px solid #272740;
}
[data-theme="dark"] .code-output { background: #0f0f19; border-color: #272740; }

/* ── Drop Zone ────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg);
  position: relative;
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 4px var(--accent-glow);
}
.drop-zone .dz-icon { font-size: 44px; margin-bottom: 12px; }
.drop-zone p { color: var(--text-secondary); font-size: 14px; }
.drop-zone .dz-hint { font-size: 12px; color: var(--text-tertiary); margin-top: 4px; }

/* ── Preview ──────────────────────────────────── */
.preview-img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ── Controls Row ─────────────────────────────── */
.controls-row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.controls-row > * { flex: 1; min-width: 120px; }

/* ── Result Bar ───────────────────────────────── */
.result-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 14px;
  background: rgba(0,200,83,0.08);
  border: 1px solid rgba(0,200,83,0.2);
  color: #008236;
}
[data-theme="dark"] .result-bar { color: #4ade80; }

/* ── Live Clock ───────────────────────────────── */
.live-clock {
  font-size: 28px;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  text-align: center;
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 20px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ── Footer ───────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px 32px;
  margin-top: 64px;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-brand {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.footer-brand strong {
  font-size: 16px;
  color: var(--text);
  display: block;
  margin-bottom: 4px;
}

.footer-links {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}
.footer-links h5 {
  font-size: 12px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}
.footer-links a {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--text); }

.footer-bottom {
  max-width: 1280px;
  margin: 32px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ── 404 Page ─────────────────────────────────── */
.error-page {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 24px;
}
.error-page .error-code {
  font-size: 100px;
  font-weight: 900;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 12px;
}
.error-page h2 {
  font-size: 24px;
  font-weight: 650;
  margin-bottom: 8px;
}
.error-page p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ── Toast / Notification ─────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 20px;
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 200;
  animation: slideUp 300ms ease;
}
.toast-success { border-left: 3px solid var(--success); }
.toast-error { border-left: 3px solid var(--danger); }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Loading Skeleton ─────────────────────────── */
.skeleton {
  background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border) 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Feature Grid (for stats/features) ─────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px;
  margin: 32px 0;
}
.feature-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: all var(--transition);
}
.feature-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}
.feature-card .feat-icon {
  font-size: 24px;
  margin-bottom: 10px;
}
.feature-card h4 {
  font-size: 15px;
  font-weight: 650;
  margin-bottom: 4px;
}
.feature-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Responsive ───────────────────────────────── */
@media (max-width: 768px) {
  .navbar-links { display: none; }
  .navbar-inner { padding: 0 16px; }
  .hero { padding: 48px 16px 40px; }
  .hero h1 { font-size: 32px; }
  .hero-stats { gap: 24px; }
  .hero-stat .stat-number { font-size: 24px; }
  .tool-grid { grid-template-columns: 1fr; }
  .affiliate-grid { grid-template-columns: 1fr; }
  .tool-page { padding: 32px 16px 48px; }
  .tool-page .tool-header h1 { font-size: 28px; }
  .footer-links { gap: 24px; }
  .trust-strip { gap: 8px; padding: 14px 0; }
  .trust-strip .trust-item { font-size: 11px; padding: 3px 10px; }
  .sponsor-qrcodes { gap: 20px; }
  .sponsor-qr img { width: 120px; height: 120px; }
}

@media (max-width: 480px) {
  .hero-stats { flex-direction: column; gap: 12px; }
  .footer-inner { flex-direction: column; }
}