/* ============================================================
   ToolBox — Modern UI (2026)
   Mesh gradients · Glassmorphism · Scroll animations · Bento
   ============================================================ */

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

/* ---------- Tokens ---------- */
:root {
  /* Palette */
  --c-brand: #6366f1;
  --c-brand-light: #818cf8;
  --c-brand-dark: #4f46e5;
  --c-accent: #06b6d4;
  --c-accent2: #f472b6;
  --c-success: #10b981;

  /* Surfaces */
  --bg: #fafafa;
  --bg-subtle: #f4f4f5;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-glass: rgba(255,255,255,.55);
  --surface-glass-border: rgba(255,255,255,.25);

  /* Text */
  --text: #09090b;
  --text-2: #3f3f46;
  --text-3: #71717a;

  /* Borders & Shadows */
  --border: #e4e4e7;
  --border-hover: #a1a1aa;
  --ring: rgba(99,102,241,.25);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow: 0 2px 8px rgba(0,0,0,.05);
  --shadow-md: 0 8px 24px rgba(0,0,0,.07);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.08);
  --shadow-glow: 0 0 40px rgba(99,102,241,.12);

  /* Sizing */
  --max-w: 1280px;
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  /* Motion */
  --ease: cubic-bezier(.4,0,.2,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --dur: .25s;
  --dur-slow: .5s;
}

/* ---------- Dark ---------- */
[data-theme="dark"] {
  --c-brand: #818cf8;
  --c-brand-light: #a5b4fc;
  --c-brand-dark: #6366f1;
  --bg: #09090b;
  --bg-subtle: #18181b;
  --surface: #18181b;
  --surface-raised: #27272a;
  --surface-glass: rgba(24,24,27,.65);
  --surface-glass-border: rgba(63,63,70,.35);
  --text: #fafafa;
  --text-2: #d4d4d8;
  --text-3: #a1a1aa;
  --border: #27272a;
  --border-hover: #52525b;
  --ring: rgba(129,140,248,.25);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow: 0 2px 8px rgba(0,0,0,.4);
  --shadow-md: 0 8px 24px rgba(0,0,0,.5);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.6);
  --shadow-glow: 0 0 60px rgba(129,140,248,.15);
}
[data-theme="dark"] .hero-mesh { opacity: .3; }
[data-theme="dark"] .tool-icon { filter: brightness(.85) saturate(1.2); }

/* ---------- Base ---------- */
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a { color: var(--c-brand); text-decoration: none; transition: color var(--dur) var(--ease); }
a:hover { color: var(--c-brand-dark); }
::selection { background: var(--c-brand); color: #fff; }

/* ---------- Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--bg);
  border-bottom: none;
  transition: all var(--dur) var(--ease);
}
.header.scrolled {
  background: var(--surface-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--surface-glass-border);
  box-shadow: var(--shadow-md);
}
.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--c-brand);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -.03em;
}
.logo:hover { color: var(--c-brand-dark); }
.logo svg { width: 28px; height: 28px; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  color: var(--text-3);
  font-size: .87rem;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: var(--radius-full);
  transition: all var(--dur) var(--ease);
}
.nav a:hover { color: var(--c-brand); background: var(--ring); }

/* Theme toggle */
.theme-toggle {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 1rem;
  margin-left: 6px;
  transition: all var(--dur) var(--ease);
}
.theme-toggle:hover { border-color: var(--c-brand); box-shadow: 0 0 0 3px var(--ring); }

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  width: 38px; height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
}
.mobile-nav {
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  box-shadow: var(--shadow-lg);
  z-index: 199;
  transform: translateY(-120%);
  transition: transform var(--dur) var(--ease);
}
.mobile-nav.open { transform: translateY(0); }
.mobile-nav a { display: block; padding: 12px 16px; border-radius: var(--radius-sm); color: var(--text); font-weight: 500; }
.mobile-nav a:hover { background: var(--ring); color: var(--c-brand); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  text-align: center;
  padding: 96px 32px 72px;
  overflow: hidden;
}
.hero-mesh {
  position: absolute;
  inset: -80px;
  background:
    radial-gradient(ellipse 70% 50% at 20% 30%, rgba(99,102,241,.18), transparent 70%),
    radial-gradient(ellipse 60% 55% at 75% 55%, rgba(6,182,212,.15), transparent 70%),
    radial-gradient(ellipse 50% 45% at 50% 80%, rgba(244,114,182,.12), transparent 70%);
  animation: meshFloat 20s ease infinite;
  pointer-events: none;
}
@keyframes meshFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(20px, -15px) scale(1.02); }
  66% { transform: translate(-15px, 10px) scale(.98); }
}
.hero > * { position: relative; z-index: 1; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px 6px 10px;
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-full);
  font-size: .8rem;
  font-weight: 600;
  color: var(--c-brand);
  margin-bottom: 28px;
  box-shadow: var(--shadow);
}
.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 8px rgba(16,185,129,.5);
  animation: pulse-dot 2s ease infinite;
}
@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(.7); opacity: .5; }
}

.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.04em;
  margin-bottom: 20px;
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--c-brand) 0%, var(--c-accent) 50%, var(--c-accent2) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 6s ease infinite;
}
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-3);
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.75;
}

/* Hero Stats */
.hero-stats {
  display: inline-flex;
  gap: 2px;
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  padding: 4px;
  box-shadow: var(--shadow-md);
}
.hero-stat {
  padding: 16px 32px;
  border-radius: calc(var(--radius-lg) - 4px);
  transition: background var(--dur) var(--ease);
}
.hero-stat:hover { background: var(--ring); }
.hero-stat .number {
  font-size: 1.7rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-brand), var(--c-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.hero-stat .label {
  font-size: .78rem;
  color: var(--text-3);
  font-weight: 500;
}

/* ---------- Search ---------- */
.search-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px 12px;
}
.search-box {
  position: relative;
  max-width: 540px;
  margin: 0 auto;
}
.search-box input {
  width: 100%;
  padding: 16px 24px 16px 52px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-full);
  font-family: inherit;
  font-size: .95rem;
  background: var(--surface);
  color: var(--text);
  transition: all var(--dur) var(--ease);
  box-shadow: var(--shadow-sm);
}
.search-box input:focus {
  outline: none;
  border-color: var(--c-brand);
  box-shadow: 0 0 0 4px var(--ring), var(--shadow-md);
}
.search-box input::placeholder { color: var(--text-3); }
.search-icon {
  position: absolute;
  left: 18px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  width: 16px;
  height: 16px;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}
.search-count {
  text-align: center;
  font-size: .8rem;
  color: var(--text-3);
  margin-top: 10px;
}

/* ---------- Category Nav ---------- */
.category-nav {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 12px 32px 36px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.category-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-full);
  font-family: inherit;
  font-size: .82rem;
  font-weight: 500;
  color: var(--text-3);
  background: var(--surface);
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
}
.category-chip:hover {
  border-color: var(--c-brand);
  color: var(--c-brand);
  box-shadow: 0 0 0 3px var(--ring);
}
.category-chip.active {
  background: var(--c-brand);
  color: #fff;
  border-color: var(--c-brand);
  box-shadow: 0 4px 12px rgba(99,102,241,.3);
}
.chip-icon { font-size: .95rem; }
.chip-count {
  padding: 1px 8px;
  border-radius: var(--radius-full);
  font-size: .7rem;
  font-weight: 600;
}
.category-chip:not(.active) .chip-count { background: var(--bg-subtle); }
.category-chip.active .chip-count { background: rgba(255,255,255,.25); }

/* ---------- Tool Sections ---------- */
.tools-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px 56px;
}
.section-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.section-icon {
  width: 42px; height: 42px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.section-icon.img-icon  { background: linear-gradient(135deg, #dcfce7, #bbf7d0); }
.section-icon.dev-icon  { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.section-icon.css-icon  { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.section-icon.txt-icon  { background: linear-gradient(135deg, #ccfbf1, #99f6e4); }
.section-icon.conv-icon { background: linear-gradient(135deg, #ffedd5, #fed7aa); }
.section-icon.calc-icon { background: linear-gradient(135deg, #fce7f3, #fbcfe8); }
.section-icon.sec-icon  { background: linear-gradient(135deg, #fee2e2, #fecaca); }
.section-icon.gen-icon  { background: linear-gradient(135deg, #fef9c3, #fde68a); }
.tools-section h2 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -.02em;
}
.section-count {
  margin-left: auto;
  font-size: .75rem;
  font-weight: 600;
  color: var(--text-3);
  background: var(--bg-subtle);
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

/* ---------- Tool Grid ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

/* ---------- Tool Card ---------- */
.tool-card {
  position: relative;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: all var(--dur) var(--ease);
}
/* Animated gradient border on hover */
.tool-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--c-brand), var(--c-accent), var(--c-accent2), var(--c-brand));
  background-size: 300% 300%;
  z-index: -1;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
  animation: borderGradient 4s ease infinite;
}
@keyframes borderGradient {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.tool-card::after {
  content: '';
  position: absolute;
  inset: 1.5px;
  border-radius: calc(var(--radius) - 1.5px);
  background: var(--surface);
  z-index: -1;
  transition: background var(--dur) var(--ease);
}
.tool-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-glow);
  transform: translateY(-6px);
  text-decoration: none;
}
.tool-card:hover::before { opacity: 1; }
.tool-card:active { transform: translateY(-3px); }

/* Scroll reveal */
.tool-card {
  opacity: 0;
  transform: translateY(24px);
}
.tool-card.visible {
  animation: cardReveal .6s var(--ease) forwards;
}
.tool-card.visible:nth-child(2) { animation-delay: .06s; }
.tool-card.visible:nth-child(3) { animation-delay: .12s; }
.tool-card.visible:nth-child(4) { animation-delay: .18s; }
.tool-card.visible:nth-child(5) { animation-delay: .24s; }
.tool-card.visible:nth-child(6) { animation-delay: .3s; }
.tool-card.visible:nth-child(7) { animation-delay: .36s; }
.tool-card.visible:nth-child(8) { animation-delay: .42s; }
@keyframes cardReveal {
  to { opacity: 1; transform: translateY(0); }
}

.tool-icon {
  width: 46px; height: 46px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  transition: transform var(--dur) var(--ease-spring);
}
.tool-card:hover .tool-icon { transform: scale(1.15) rotate(-3deg); }
.tool-icon.blue   { background: linear-gradient(135deg, #dbeafe, #bfdbfe); color: #4f46e5; }
.tool-icon.green  { background: linear-gradient(135deg, #dcfce7, #bbf7d0); color: #16a34a; }
.tool-icon.purple { background: linear-gradient(135deg, #ede9fe, #ddd6fe); color: #7c3aed; }
.tool-icon.orange { background: linear-gradient(135deg, #ffedd5, #fed7aa); color: #ea580c; }
.tool-icon.pink   { background: linear-gradient(135deg, #fce7f3, #fbcfe8); color: #db2777; }
.tool-icon.teal   { background: linear-gradient(135deg, #ccfbf1, #99f6e4); color: #0d9488; }

.tool-card h3 {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -.01em;
}
.tool-card p {
  font-size: .85rem;
  color: var(--text-3);
  flex: 1;
  line-height: 1.65;
}
.tool-card .arrow {
  color: var(--c-brand);
  font-size: .82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--dur) var(--ease);
}
.tool-card:hover .arrow { gap: 12px; }

/* ---------- Ad Banner ---------- */
.ad-banner {
  max-width: var(--max-w);
  margin: 0 auto 36px;
  padding: 0 32px;
}
.ad-placeholder {
  background: var(--bg-subtle);
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  height: 90px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-3);
  font-size: .8rem;
}

/* ---------- No results ---------- */
.no-results {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-3);
  display: none;
}
.no-results .nr-icon { font-size: 3rem; margin-bottom: 16px; }
.no-results h3 { font-size: 1.15rem; color: var(--text); margin-bottom: 8px; }

/* ---------- About ---------- */
.about-content {
  max-width: 680px;
  color: var(--text-3);
  line-height: 1.85;
  font-size: .95rem;
}

/* ---------- Footer ---------- */
.footer {
  margin-top: auto;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 48px 32px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  text-align: center;
}
.footer-links {
  display: flex; justify-content: center; gap: 24px; margin-bottom: 16px; flex-wrap: wrap;
}
.footer-links a { color: var(--text-3); font-size: .87rem; }
.footer-links a:hover { color: var(--c-brand); }
.footer p { color: var(--text-3); font-size: .82rem; }
.footer-note { font-size: .75rem; opacity: .6; margin-top: 8px; }

/* ---------- Scroll Top ---------- */
.scroll-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 46px; height: 46px;
  background: linear-gradient(135deg, var(--c-brand), var(--c-brand-dark));
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(99,102,241,.35);
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(.8);
  transition: all var(--dur) var(--ease-spring);
  z-index: 100;
}
.scroll-top.visible { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
.scroll-top:hover { transform: translateY(-3px) scale(1.05); box-shadow: 0 12px 32px rgba(99,102,241,.45); }

/* ============================================================
   Tool Page (shared by all tool pages)
   ============================================================ */
.tool-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 32px 80px;
}
.tool-page h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -.03em;
}
.tool-page .desc {
  color: var(--text-3);
  margin-bottom: 32px;
  font-size: 1.05rem;
}
.tool-container {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

/* Form */
textarea, input[type="text"], input[type="number"], select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: .9rem;
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  transition: all var(--dur) var(--ease);
}
textarea:focus, input:focus, select:focus {
  outline: none;
  border-color: var(--c-brand);
  box-shadow: 0 0 0 3px var(--ring);
}
label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: .93rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--dur) var(--ease);
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-brand), var(--c-brand-dark));
  color: #fff;
  box-shadow: 0 4px 12px rgba(99,102,241,.3);
}
.btn-primary:hover {
  box-shadow: 0 8px 24px rgba(99,102,241,.4);
  transform: translateY(-2px);
}
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover { border-color: var(--c-brand); color: var(--c-brand); }
.btn-group { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

/* Result */
.result-area {
  margin-top: 24px;
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  min-height: 60px;
  font-family: 'JetBrains Mono', monospace;
  font-size: .85rem;
  white-space: pre-wrap;
  word-break: break-all;
  position: relative;
}
.copy-btn {
  position: absolute; top: 8px; right: 8px;
  padding: 6px 12px;
  font-size: .75rem;
  font-family: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-3);
  transition: all var(--dur) var(--ease);
}
.copy-btn:hover { background: var(--c-brand); color: #fff; border-color: var(--c-brand); }

/* Toast */
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .9rem;
  box-shadow: var(--shadow-lg);
  transform: translateY(100px);
  opacity: 0;
  transition: all .3s var(--ease);
  z-index: 1000;
}
.toast.show { transform: translateY(0); opacity: 1; }

/* Specific tool styles */
.password-display {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.3rem;
  text-align: center;
  padding: 20px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  word-break: break-all;
  letter-spacing: 1px;
  position: relative;
}
.strength-bar { height: 6px; border-radius: 3px; background: var(--border); margin-top: 12px; overflow: hidden; }
.strength-bar-fill { height: 100%; border-radius: 3px; transition: width .3s ease, background .3s ease; }
.options-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 20px 0; }
.option-item { display: flex; align-items: center; gap: 8px; }
.option-item input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--c-brand); }
.range-group { margin: 20px 0; }
.range-group input[type="range"] { width: 100%; accent-color: var(--c-brand); }
.range-label { display: flex; justify-content: space-between; font-size: .85rem; color: var(--text-3); }
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  background: var(--bg);
}
.drop-zone:hover, .drop-zone.dragover { border-color: var(--c-brand); background: var(--ring); }
.drop-zone p { color: var(--text-3); margin-top: 8px; }
.drop-zone .icon { font-size: 2.5rem; }
.image-preview { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 24px; }
.preview-box { text-align: center; }
.preview-box img { max-height: 200px; margin: 0 auto 8px; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.preview-box .size { font-size: .85rem; color: var(--text-3); }
.compression-stats { text-align: center; padding: 16px; background: #dcfce7; border-radius: var(--radius-sm); margin-top: 16px; font-weight: 600; color: #16a34a; }
.qr-output { text-align: center; padding: 24px; }
.qr-output canvas { margin: 0 auto; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .header-inner { padding: 0 16px; }
  .nav a { display: none; }
  .nav .theme-toggle { margin-left: 0; }
  .mobile-menu-btn { display: flex; }
  .hero { padding: 56px 16px 40px; }
  .hero-stats { flex-direction: column; gap: 0; border-radius: var(--radius); }
  .hero-stat { padding: 12px 24px; }
  .tools-section { padding: 0 16px 36px; }
  .tool-grid { grid-template-columns: 1fr; gap: 10px; }
  .options-grid { grid-template-columns: 1fr; }
  .image-preview { grid-template-columns: 1fr; }
  .tool-container { padding: 20px; }
  .search-section { padding: 0 16px 8px; }
  .category-nav { padding: 8px 16px 24px; gap: 6px; }
  .ad-banner { padding: 0 16px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.8rem; }
}