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

:root {
  --bg:             #FAFAFA;
  --surface:        #FFFFFF;
  --border:         #E5E7EB;
  --border-faint:   #F3F4F6;

  --text-1:         #111827;
  --text-2:         #6B7280;
  --text-3:         #9CA3AF;

  --accent:         #2563EB;
  --accent-subtle:  #EFF6FF;
  --accent-mid:     #BFDBFE;

  --green-bg:       #F0FDF4;
  --green-text:     #166534;
  --green-border:   #86EFAC;

  --amber-bg:       #FFFBEB;
  --amber-border:   #FCD34D;
  --amber-text:     #92400E;

  --pill-classic-bg:   #F0FDF4;
  --pill-classic-text: #166534;
  --pill-new-bg:       #EFF6FF;
  --pill-new-text:     #1D4ED8;

  --code-bg:   #F3F4F6;
  --code-text: #374151;

  --radius-s:  6px;
  --radius-m:  12px;
  --radius-l:  16px;

  --shadow-card: 0 1px 3px rgba(0,0,0,.05), 0 1px 2px rgba(0,0,0,.03);
  --shadow-hover: 0 6px 16px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);

  --font:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono:  'JetBrains Mono', 'Cascadia Code', 'Consolas', monospace;

  --max-w: 1100px;
}

[data-theme="dark"] {
  --bg:             #0F1117;
  --surface:        #161B27;
  --border:         #2A2F42;
  --border-faint:   #1E2235;

  --text-1:         #F1F5F9;
  --text-2:         #94A3B8;
  --text-3:         #4B5563;

  --accent:         #60A5FA;
  --accent-subtle:  #1E3A5F33;
  --accent-mid:     #1D4ED8;

  --green-bg:       #052E16;
  --green-text:     #4ADE80;
  --green-border:   #166534;

  --amber-bg:       #1C1400;
  --amber-border:   #92400E;
  --amber-text:     #FCD34D;

  --pill-classic-bg:   #052E16;
  --pill-classic-text: #4ADE80;
  --pill-new-bg:       #1E3A5F;
  --pill-new-text:     #93C5FD;

  --code-bg:   #1E2235;
  --code-text: #CBD5E1;

  --shadow-card: 0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
  --shadow-hover: 0 6px 16px rgba(0,0,0,.5), 0 2px 4px rgba(0,0,0,.4);
}

[data-theme="dark"] .site-header {
  background: rgba(22, 27, 39, 0.92);
}

[data-theme="dark"] .card-featured {
  background: linear-gradient(160deg, var(--surface) 60%, #1e3a5f30);
}

[data-theme="dark"] .logo-img,
[data-theme="dark"] .footer-logo-img {
  filter: invert(1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

code {
  font-family: var(--mono);
  font-size: .875em;
  background: var(--code-bg);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
}

em { font-style: italic; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
}

.logo {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text-1);
  text-decoration: none;
  white-space: nowrap;
}

.logo-img {
  height: 32px;
  width: auto;
  display: block;
}

.bracket { color: var(--accent); font-weight: 500; }

.header-sep {
  width: 1px;
  height: 18px;
  background: var(--border);
}

.tagline {
  font-size: .8125rem;
  color: var(--text-2);
}

.theme-toggle {
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.section-hero {
  padding: 64px 0 48px;
}

.hero-text {
  margin-bottom: 40px;
}

.hero-text h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.hero-text p {
  font-size: 1.0625rem;
  color: var(--text-2);
  max-width: 560px;
  line-height: 1.7;
}

.live-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.ls-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 18px 20px;
}

.ls-label {
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 6px;
}

.ls-value {
  font-family: var(--mono);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--accent);
}

.section-calc {
  padding: 0 0 56px;
}

.sec-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.calc-box {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 18px 24px;
  max-width: 480px;
}

.calc-inputs {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  overflow: hidden;
}

.calc-input {
  width: 74px;
  padding: 9px 12px;
  font-family: var(--mono);
  font-size: .9375rem;
  font-weight: 600;
  border: none;
  outline: none;
  background: var(--bg);
  color: var(--text-1);
}

.calc-select {
  padding: 9px 10px;
  font-family: var(--mono);
  font-size: .9375rem;
  font-weight: 600;
  border: none;
  border-left: 1px solid var(--border);
  outline: none;
  background: var(--bg);
  color: var(--text-1);
  cursor: pointer;
}

.calc-eq {
  font-size: 1.25rem;
  color: var(--text-3);
  flex-shrink: 0;
}

.calc-result {
  font-family: var(--mono);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--accent);
}

.calc-px {
  font-size: .875rem;
  font-weight: 400;
  color: var(--text-2);
  margin-left: 2px;
}

.section-units { padding: 0 0 88px; }

.unit-group { margin-bottom: 64px; }

.group-head {
  margin-bottom: 28px;
}

.group-head h2 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -.02em;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.group-head p {
  font-size: .9rem;
  color: var(--text-2);
}

.badge-new {
  font-size: .625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  background: var(--pill-new-bg);
  color: var(--pill-new-text);
  padding: 3px 9px;
  border-radius: 20px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-card);
  transition: box-shadow .2s ease, transform .2s ease;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}

.card-featured {
  border-color: var(--accent-mid);
  background: linear-gradient(160deg, #fff 60%, var(--accent-subtle));
}

.card-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pill {
  font-family: var(--mono);
  font-size: .9375rem;
  font-weight: 600;
  background: var(--pill-classic-bg);
  color: var(--pill-classic-text);
  padding: 3px 12px;
  border-radius: 20px;
  flex-shrink: 0;
}

.pill-new {
  background: var(--pill-new-bg);
  color: var(--pill-new-text);
}

.unit-name {
  font-size: .9375rem;
  font-weight: 600;
  color: var(--text-1);
}

.card-desc {
  font-size: .875rem;
  color: var(--text-2);
  line-height: 1.65;
}

.vis-wrap {
  background: var(--border-faint);
  border-radius: var(--radius-s);
  padding: 10px;
  display: flex;
  justify-content: center;
}

.vis-wrap svg {
  width: 100%;
  max-height: 100px;
  height: auto;
}

.live-row {
  font-size: .8125rem;
  font-family: var(--mono);
  color: var(--text-2);
  background: var(--bg);
  border: 1px solid var(--border-faint);
  border-radius: 20px;
  padding: 5px 14px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  width: fit-content;
}

.lv {
  color: var(--accent);
  font-weight: 600;
}

.snips {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.snip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: var(--code-bg);
  border-radius: var(--radius-s);
  padding: 8px 12px;
}

.snip code {
  background: none;
  color: var(--code-text);
  padding: 0;
  font-size: .8rem;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-btn {
  flex-shrink: 0;
  font-family: var(--font);
  font-size: .6875rem;
  font-weight: 500;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 9px;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
  line-height: 1.4;
}

.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.copy-btn.copied {
  color: var(--green-text);
  border-color: var(--green-border);
  background: var(--green-bg);
}

.use-line {
  font-size: .8125rem;
  color: var(--text-2);
  border-top: 1px solid var(--border-faint);
  padding-top: 10px;
}

.use-tag {
  font-weight: 600;
  color: var(--text-1);
  margin-right: 4px;
}

.card-note {
  font-size: .8rem;
  color: var(--amber-text);
  background: var(--amber-bg);
  border: 1px solid var(--amber-border);
  border-radius: var(--radius-s);
  padding: 9px 12px;
  line-height: 1.5;
}

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-m);
  border: 1px solid var(--border);
}

.cmp-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  font-size: .875rem;
}

.cmp-table th {
  background: var(--bg);
  color: var(--text-2);
  font-size: .6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.cmp-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border-faint);
  color: var(--text-1);
}

.cmp-table tr:last-child td { border-bottom: none; }
.cmp-table tr:hover td { background: var(--bg); }

.td-ok   { color: var(--green-text); font-weight: 500; }
.td-warn { color: var(--amber-text); font-weight: 500; }
.td-yes  { color: var(--accent);     font-weight: 600; }
.td-no   { color: var(--text-3); }

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.support-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sup-units {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sup-units code {
  font-size: .8125rem;
}

.sup-badge {
  display: inline-block;
  font-size: .6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  padding: 3px 10px;
  border-radius: 20px;
  width: fit-content;
}

.sup-green { background: var(--green-bg); color: var(--green-text); }
.sup-blue  { background: var(--pill-new-bg); color: var(--pill-new-text); }

.sup-detail {
  font-size: .8rem;
  color: var(--text-2);
}

.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 44px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.footer-logo {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text-1);
}

.footer-logo-img {
  height: 28px;
  width: auto;
}

.footer-copy {
  font-size: .875rem;
  color: var(--text-2);
}

.footer-copy a {
  color: #4a9eff;
  text-decoration: none;
}

.footer-note {
  font-size: .8125rem;
  color: var(--text-3);
}

@media (max-width: 768px) {
  .live-stats { grid-template-columns: repeat(2, 1fr); }
  .cards { grid-template-columns: 1fr; }
  .support-grid { grid-template-columns: 1fr; }

  .section-hero { padding: 40px 0 32px; }
  .hero-text h1 { font-size: 1.875rem; }

  .calc-box { flex-wrap: wrap; max-width: 100%; }

  .tagline { display: none; }
  .header-sep { display: none; }
}

@media (max-width: 480px) {
  .live-stats { grid-template-columns: repeat(2, 1fr); }
  .container { padding: 0 16px; }
  .ls-value { font-size: 1.125rem; }
}