:root {
  color-scheme: dark;
  --bg: #09090b;
  --bg-accent: #131316;
  --surface: #18181b;
  --surface-2: #1f1f23;
  --ink: #fafafa;
  --muted: #a1a1aa;
  --line: #3f3f46;
  --line-soft: #27272a;
  --accent: #38bdf8;
  --accent-2: #2dd4bf;
  --accent-soft: rgba(56, 189, 248, 0.12);
  --warn-bg: #422006;
  --warn-ink: #fbbf24;
  --error-bg: #3f1219;
  --error-ink: #fb7185;
  --ok-bg: #052e16;
  --ok-ink: #4ade80;
  --placeholder: #71717a;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --sans: Inter, ui-sans-serif, system-ui, sans-serif;
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, monospace;
  --sidebar: 18.5rem;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f4f5;
  --bg-accent: #e4e4e7;
  --surface: #ffffff;
  --surface-2: #fafafa;
  --ink: #18181b;
  --muted: #52525b;
  --line: #d4d4d8;
  --line-soft: #e4e4e7;
  --accent: #0284c7;
  --accent-2: #0d9488;
  --accent-soft: rgba(2, 132, 199, 0.1);
  --warn-bg: #fef3c7;
  --warn-ink: #92400e;
  --error-bg: #fee2e2;
  --error-ink: #9f1239;
  --ok-bg: #dcfce7;
  --ok-ink: #166534;
  --placeholder: #a1a1aa;
  --shadow: 0 12px 36px rgba(24, 24, 27, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background:
    radial-gradient(900px 420px at 0% -10%, rgba(56, 189, 248, 0.08), transparent 55%),
    radial-gradient(700px 380px at 100% 0%, rgba(45, 212, 191, 0.06), transparent 50%),
    var(--bg);
  color: var(--ink);
  line-height: 1.55;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration-thickness: 1px; }
a:hover { color: var(--accent-2); }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  z-index: 20;
}
.skip-link:focus { top: 1rem; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 8;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--line-soft);
}

.header-inner {
  width: min(1280px, calc(100% - 2rem));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  font-family: var(--mono);
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.brand:hover { color: var(--accent); }
.brand small {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.78rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-toggle,
.theme-toggle,
.copy-btn,
.btn,
.preset {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 999px;
}

.nav-toggle,
.theme-toggle {
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
}
.nav-toggle { display: none; }

.theme-toggle:hover,
.copy-btn:hover,
.btn:hover,
.preset:hover,
.nav-toggle:hover {
  border-color: var(--accent);
}

.layout {
  width: min(1280px, calc(100% - 2rem));
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--sidebar) minmax(0, 1fr);
  gap: 1.4rem;
  padding: 1.2rem 0 2.5rem;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 4.2rem;
  max-height: calc(100vh - 5rem);
  overflow: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem 0.85rem 1rem;
  box-shadow: var(--shadow);
}

.sidebar h2 {
  margin: 0.85rem 0 0.35rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
}
.sidebar h2:first-child { margin-top: 0.15rem; }

.sidebar a {
  display: block;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 0.28rem 0.5rem;
  border-radius: 8px;
}
.sidebar a:hover { background: var(--accent-soft); color: var(--accent); }
.sidebar a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.main-panel { min-width: 0; }

.hero, .tool-card, .panel, .tip-jar, .ad-slot, .explain, .cheatsheet {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero {
  padding: 1.4rem 1.4rem 1.3rem;
  margin-bottom: 1rem;
}
.hero h1, .tool-head h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.lede {
  margin: 0;
  color: var(--muted);
  max-width: 46rem;
}

.crumb {
  margin: 0 0 0.45rem;
  font-size: 0.82rem;
  color: var(--muted);
}
.crumb a { color: var(--muted); }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.8rem;
}

.tool-card {
  padding: 1rem 1.05rem 1.1rem;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-height: 8.2rem;
}
.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}
.tool-card h2 {
  margin: 0;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
}
.tool-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}
.tool-card .kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent-2);
}

.flagship {
  border-color: var(--accent);
  background:
    linear-gradient(180deg, var(--accent-soft), transparent 55%),
    var(--surface);
  margin-bottom: 1rem;
  min-height: auto;
}

.tool-head { margin-bottom: 0.9rem; }

.panel {
  padding: 1rem 1.1rem 1.15rem;
  margin-bottom: 0.9rem;
}
.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem 0.9rem;
}
.form-grid.two { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.span-2 { grid-column: 1 / -1; }

label.field, .field {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  font-size: 0.82rem;
  color: var(--muted);
  min-width: 0;
}

input[type="text"],
input[type="number"],
input[type="password"],
input[type="datetime-local"],
input[type="email"],
select,
textarea {
  font-family: var(--mono);
  font-size: 0.92rem;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.55rem 0.7rem;
  width: 100%;
}
textarea { min-height: 8rem; resize: vertical; line-height: 1.45; }
input::placeholder, textarea::placeholder { color: var(--placeholder); }

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.theme-toggle:focus-visible,
.copy-btn:focus-visible,
.btn:focus-visible,
.preset:focus-visible,
.nav-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.check-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  align-items: center;
  font-size: 0.9rem;
  color: var(--ink);
}
.check-row label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--ink);
}

.perm-grid {
  display: grid;
  grid-template-columns: 6rem repeat(3, 1fr);
  gap: 0.35rem 0.5rem;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.perm-grid span.head { color: var(--muted); font-size: 0.75rem; }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.75rem;
}

.btn, .copy-btn, .preset {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}
.btn.primary {
  background: var(--accent);
  color: #082f49;
  border-color: transparent;
  font-weight: 650;
}
html[data-theme="light"] .btn.primary { color: #fff; }

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.8rem;
}

.output {
  font-family: var(--mono);
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.85rem;
  min-height: 4.5rem;
  font-size: 0.86rem;
  line-height: 1.45;
}

.output-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.45rem;
}
.output-head h2, .output-head h3 {
  margin: 0;
  font-size: 0.95rem;
}

.status {
  min-height: 1.3rem;
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0.4rem 0 0;
}
.status.error { color: var(--error-ink); }
.status.warn { color: var(--warn-ink); }
.status.ok { color: var(--ok-ink); }

.banner {
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  font-size: 0.88rem;
  margin: 0.5rem 0;
}
.banner.note { background: var(--accent-soft); }
.banner.warn { background: var(--warn-bg); color: var(--warn-ink); }
.banner.error { background: var(--error-bg); color: var(--error-ink); }

.kv {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 0.35rem 0.8rem;
  font-size: 0.92rem;
}
.kv dt { color: var(--muted); font-family: var(--mono); font-size: 0.8rem; }
.kv dd { margin: 0; font-family: var(--mono); overflow-wrap: anywhere; }

.explain, .cheatsheet {
  padding: 1rem 1.1rem;
  margin: 0.9rem 0;
}
.explain h2, .cheatsheet h2 { margin: 0 0 0.5rem; font-size: 1rem; }
.cheatsheet table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }
.cheatsheet th, .cheatsheet td {
  text-align: left;
  padding: 0.35rem 0.4rem;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.cheatsheet code, code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--bg-accent);
  padding: 0.05em 0.32em;
  border-radius: 5px;
}

.match-hit {
  background: rgba(56, 189, 248, 0.28);
  outline: 1px solid var(--accent);
  border-radius: 3px;
}

.ad-slot {
  margin: 1rem 0;
  border-style: dashed;
  min-height: 72px;
  display: grid;
  place-items: center;
  color: var(--placeholder);
  font-size: 0.82rem;
  box-shadow: none;
}

.tip-jar {
  margin: 1rem 0 0;
  padding: 1rem 1.15rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.1rem;
}
.tip-copy p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.tip-kicker {
  font-weight: 650;
  color: var(--ink) !important;
  font-size: 0.8rem !important;
  margin-bottom: 0.2rem !important;
}
.tip-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  background: var(--accent);
  color: #082f49;
  text-decoration: none;
  font-weight: 650;
}
html[data-theme="light"] .tip-btn { color: #fff; }
.tip-btn:hover { filter: brightness(1.08); color: #082f49; }

.site-footer {
  width: min(1280px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 0 0 2.4rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.site-footer p { margin: 0; }

.rows { display: grid; gap: 0.55rem; }
.row-inline {
  display: grid;
  grid-template-columns: 5.5rem 1fr 1.4fr 4.5rem auto;
  gap: 0.4rem;
  align-items: center;
}
@media (max-width: 720px) {
  .row-inline { grid-template-columns: 1fr 1fr; }
  .row-inline .grow { grid-column: 1 / -1; }
}

@media (max-width: 920px) {
  .nav-toggle { display: inline-flex; }
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    max-height: none;
    display: none;
  }
  .sidebar.open { display: block; }
  .kv { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}