/* ============================================================
   LightCaptcha — Site Stylesheet
   ============================================================
   COLOR SYSTEM — edit these variables to retheme the entire site.
   All colors derive from these tokens; nothing is hardcoded elsewhere.
   ============================================================ */

:root {
  /* ── Accent (yellow) ─────────────────────────────────────── */
  --lc-accent:          #ca8a04;   /* primary yellow — buttons, links, highlights */
  --lc-accent-hover:    #a16207;   /* darker on hover */
  --lc-accent-pale:     #fefce8;   /* very light yellow — icon/tag backgrounds */
  --lc-accent-border:   #fde68a;   /* light yellow — icon/tag borders */
  --lc-accent-mid:      #fbbf24;   /* mid yellow — decorative accents */
  --lc-btn-text:        #1a1400;   /* text on yellow button (near-black) */

  /* ── Neutrals ────────────────────────────────────────────── */
  --lc-white:           #ffffff;
  --lc-bg:              #ffffff;
  --lc-bg-subtle:       #fafaf8;   /* off-white sections */
  --lc-text:            #0f172a;   /* headings */
  --lc-text-body:       #334155;   /* body copy */
  --lc-text-muted:      #64748b;   /* supporting text */
  --lc-text-faint:      #94a3b8;   /* captions, metadata */
  --lc-border:          #e8e5de;   /* card/section borders */
  --lc-border-light:    #f1f5f9;   /* subtle dividers */
  --lc-card-bg:         #ffffff;

  /* ── Code blocks ─────────────────────────────────────────── */
  --lc-code-bg:         #1e293b;
  --lc-code-text:       #e2e8f0;
  --lc-code-comment:    #64748b;
  --lc-code-key:        #fbbf24;
  --lc-code-str:        #86efac;
  --lc-code-fn:         #93c5fd;

  /* ── Nav ─────────────────────────────────────────────────── */
  --lc-nav-bg:          #ffffff;
  --lc-nav-border:      #f1ecdf;
  --lc-nav-text:        #334155;
  --lc-nav-text-active: #ca8a04;

  /* ── Footer ──────────────────────────────────────────────── */
  --lc-footer-bg:       #0f172a;
  --lc-footer-text:     #94a3b8;
  --lc-footer-link:     #cbd5e1;
  --lc-footer-border:   #1e293b;

  /* ── Misc ────────────────────────────────────────────────── */
  --lc-radius:          8px;
  --lc-radius-lg:       12px;
  --lc-shadow:          0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --lc-shadow-md:       0 4px 16px rgba(0,0,0,.08), 0 1px 4px rgba(0,0,0,.04);
  --lc-font:            -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --lc-font-mono:       "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--lc-font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--lc-text-body);
  background: var(--lc-bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--lc-accent); text-decoration: none; }
a:hover { color: var(--lc-accent-hover); }

img { max-width: 100%; display: block; }

/* ── Layout ────────────────────────────────────────────────── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navigation ────────────────────────────────────────────── */
.site-nav {
  background: var(--lc-nav-bg);
  border-bottom: 1px solid var(--lc-nav-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-nav__logo {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--lc-text);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -.3px;
}

.site-nav__logo-mark {
  width: 30px;
  height: 30px;
  background: var(--lc-accent);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.site-nav__logo-mark svg { display: block; }

.site-nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.site-nav__links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--lc-nav-text);
  transition: color .15s;
}

.site-nav__links a:hover,
.site-nav__links a.active { color: var(--lc-nav-text-active); }

.site-nav__cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 20px;
  border-radius: var(--lc-radius);
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background .15s, color .15s, transform .1s;
  text-decoration: none;
  line-height: 1;
}

.btn:active { transform: scale(.98); }

.btn--primary {
  background: var(--lc-accent);
  color: var(--lc-btn-text);
}
.btn--primary:hover {
  background: var(--lc-accent-hover);
  color: var(--lc-btn-text);
}

.btn--secondary {
  background: var(--lc-bg-subtle);
  color: var(--lc-text-muted);
  border: 1px solid var(--lc-border);
}
.btn--secondary:hover {
  background: var(--lc-border-light);
  color: var(--lc-text);
}

.btn--ghost {
  background: transparent;
  color: var(--lc-text-muted);
  border: 1px solid var(--lc-border);
}
.btn--ghost:hover { color: var(--lc-text); border-color: var(--lc-text-muted); }

.btn--lg { padding: 13px 26px; font-size: 15px; }
.btn--sm { padding: 7px 14px; font-size: 13px; }

/* ── Hero ──────────────────────────────────────────────────── */
.hero {
  background: var(--lc-bg);
  border-bottom: 1px solid var(--lc-border);
  padding: 80px 0 72px;
  text-align: center;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--lc-accent-pale);
  border: 1px solid var(--lc-accent-border);
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 500;
  color: var(--lc-accent-hover);
  margin-bottom: 22px;
  letter-spacing: .2px;
}

.hero__eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lc-accent);
  flex-shrink: 0;
}

.hero__headline {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.12;
  color: var(--lc-text);
  letter-spacing: -.5px;
  margin-bottom: 18px;
}

.hero__headline em {
  font-style: normal;
  color: var(--lc-accent);
}

.hero__sub {
  font-size: 18px;
  color: var(--lc-text-muted);
  max-width: 560px;
  margin: 0 auto 36px;
  line-height: 1.65;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 52px;
}

.hero__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.hero__meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--lc-text-faint);
}

.hero__meta-item svg { color: var(--lc-accent); flex-shrink: 0; }

/* ── How it works ──────────────────────────────────────────── */
.how {
  background: var(--lc-bg-subtle);
  border-bottom: 1px solid var(--lc-border);
  padding: 72px 0;
}

.section-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--lc-accent);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  color: var(--lc-text);
  letter-spacing: -.3px;
  margin-bottom: 12px;
}

.section-sub {
  font-size: 16px;
  color: var(--lc-text-muted);
  max-width: 520px;
  line-height: 1.65;
  margin-bottom: 48px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.step {
  background: var(--lc-card-bg);
  border: 1px solid var(--lc-border);
  border-radius: var(--lc-radius-lg);
  padding: 24px;
  position: relative;
}

.step__num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--lc-accent-pale);
  border: 1.5px solid var(--lc-accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--lc-accent);
  margin-bottom: 14px;
}

.step__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--lc-text);
  margin-bottom: 7px;
}

.step__body {
  font-size: 13px;
  color: var(--lc-text-muted);
  line-height: 1.6;
}

/* ── Features ──────────────────────────────────────────────── */
.features {
  padding: 72px 0;
  border-bottom: 1px solid var(--lc-border);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--lc-bg-subtle);
  border: 1px solid var(--lc-border);
  border-radius: var(--lc-radius-lg);
  padding: 24px;
}

.feature-card__icon {
  width: 38px;
  height: 38px;
  border-radius: var(--lc-radius);
  background: var(--lc-accent-pale);
  border: 1px solid var(--lc-accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  font-size: 18px;
}

.feature-card__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--lc-text);
  margin-bottom: 6px;
}

.feature-card__body {
  font-size: 13px;
  color: var(--lc-text-muted);
  line-height: 1.6;
}

/* ── Stats strip ───────────────────────────────────────────── */
.stats {
  background: var(--lc-bg-subtle);
  border-bottom: 1px solid var(--lc-border);
  padding: 40px 0;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--lc-border);
  border: 1px solid var(--lc-border);
  border-radius: var(--lc-radius-lg);
  overflow: hidden;
}

.stat {
  background: var(--lc-card-bg);
  padding: 28px 24px;
  text-align: center;
}

.stat__num {
  font-size: 32px;
  font-weight: 800;
  color: var(--lc-accent);
  line-height: 1;
  margin-bottom: 5px;
  letter-spacing: -.5px;
}

.stat__label {
  font-size: 13px;
  color: var(--lc-text-muted);
}

/* ── Quickstart / code ─────────────────────────────────────── */
.quickstart {
  padding: 72px 0;
  border-bottom: 1px solid var(--lc-border);
}

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: -1px;
  position: relative;
  z-index: 1;
}

.tab-btn {
  padding: 9px 18px;
  border: 1px solid var(--lc-border);
  border-bottom: none;
  background: var(--lc-bg-subtle);
  color: var(--lc-text-muted);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--lc-radius) var(--lc-radius) 0 0;
  cursor: pointer;
  transition: background .15s, color .15s;
  font-family: var(--lc-font);
}

.tab-btn.active {
  background: var(--lc-code-bg);
  color: var(--lc-code-key);
  border-color: var(--lc-code-bg);
}

.code-block {
  background: var(--lc-code-bg);
  border: 1px solid #334155;
  border-radius: 0 var(--lc-radius-lg) var(--lc-radius-lg) var(--lc-radius-lg);
  padding: 28px;
  overflow-x: auto;
  position: relative;
}

.code-block pre {
  font-family: var(--lc-font-mono);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--lc-code-text);
  margin: 0;
}

.code-block .kw  { color: var(--lc-code-key); }
.code-block .str { color: var(--lc-code-str); }
.code-block .fn  { color: var(--lc-code-fn); }
.code-block .cm  { color: var(--lc-code-comment); }

.copy-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  background: #334155;
  color: #94a3b8;
  border: none;
  border-radius: 5px;
  padding: 5px 10px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--lc-font);
  transition: background .15s, color .15s;
}
.copy-btn:hover { background: #475569; color: #e2e8f0; }

/* ── Download CTA ──────────────────────────────────────────── */
.download-cta {
  background: var(--lc-accent-pale);
  border-top: 1px solid var(--lc-accent-border);
  border-bottom: 1px solid var(--lc-accent-border);
  padding: 64px 0;
  text-align: center;
}

.download-cta__title {
  font-size: 28px;
  font-weight: 700;
  color: var(--lc-text);
  margin-bottom: 12px;
  letter-spacing: -.3px;
}

.download-cta__sub {
  font-size: 16px;
  color: var(--lc-text-muted);
  margin-bottom: 28px;
}

.download-cta__actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ── Docs page ─────────────────────────────────────────────── */
.docs-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
  min-height: calc(100vh - 60px);
  align-items: start;
}

.docs-sidebar {
  position: sticky;
  top: 60px;
  height: calc(100vh - 60px);
  overflow-y: auto;
  border-right: 1px solid var(--lc-border);
  padding: 32px 0;
  background: var(--lc-bg-subtle);
}

.docs-sidebar__section {
  margin-bottom: 24px;
  padding: 0 20px;
}

.docs-sidebar__heading {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--lc-text-faint);
  margin-bottom: 8px;
}

.docs-sidebar__links { list-style: none; }

.docs-sidebar__links li { margin-bottom: 2px; }

.docs-sidebar__links a {
  display: block;
  padding: 5px 8px;
  border-radius: 5px;
  font-size: 13px;
  color: var(--lc-text-muted);
  transition: background .12s, color .12s;
}

.docs-sidebar__links a:hover { background: var(--lc-border-light); color: var(--lc-text); }
.docs-sidebar__links a.active { background: var(--lc-accent-pale); color: var(--lc-accent); font-weight: 600; }

.docs-content {
  padding: 48px 56px;
  max-width: 780px;
}

.docs-content h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--lc-text);
  letter-spacing: -.4px;
  margin-bottom: 12px;
}

.docs-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--lc-text);
  letter-spacing: -.2px;
  margin: 48px 0 12px;
  padding-top: 48px;
  border-top: 1px solid var(--lc-border-light);
}

.docs-content h2:first-of-type { border-top: none; padding-top: 0; margin-top: 32px; }

.docs-content h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--lc-text);
  margin: 28px 0 8px;
}

.docs-content p {
  font-size: 15px;
  color: var(--lc-text-body);
  line-height: 1.75;
  margin-bottom: 16px;
}

.docs-content ul, .docs-content ol {
  margin: 0 0 16px 20px;
}

.docs-content li {
  font-size: 15px;
  color: var(--lc-text-body);
  line-height: 1.7;
  margin-bottom: 4px;
}

.docs-content code {
  background: var(--lc-accent-pale);
  border: 1px solid var(--lc-accent-border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: var(--lc-font-mono);
  font-size: .875em;
  color: var(--lc-accent-hover);
}

.docs-content .code-block code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.docs-content .code-block {
  margin: 16px 0 24px;
  border-radius: var(--lc-radius-lg);
}

.callout {
  background: var(--lc-accent-pale);
  border: 1px solid var(--lc-accent-border);
  border-left: 3px solid var(--lc-accent);
  border-radius: var(--lc-radius);
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 14px;
  color: var(--lc-accent-hover);
  line-height: 1.6;
}

.callout strong { color: var(--lc-accent); }

.param-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 13.5px;
}

.param-table th {
  text-align: left;
  padding: 10px 14px;
  background: var(--lc-bg-subtle);
  color: var(--lc-text-muted);
  font-weight: 600;
  border: 1px solid var(--lc-border);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .5px;
}

.param-table td {
  padding: 10px 14px;
  border: 1px solid var(--lc-border);
  color: var(--lc-text-body);
  vertical-align: top;
  line-height: 1.5;
}

.param-table td:first-child {
  font-family: var(--lc-font-mono);
  font-size: 12.5px;
  color: var(--lc-accent-hover);
  white-space: nowrap;
}

.param-table tr:nth-child(even) td { background: var(--lc-bg-subtle); }

/* ── Demo page ─────────────────────────────────────────────── */
.demo-page {
  background: var(--lc-bg-subtle);
  min-height: calc(100vh - 60px);
  padding: 60px 0;
}

.demo-card {
  background: var(--lc-card-bg);
  border: 1px solid var(--lc-border);
  border-radius: var(--lc-radius-lg);
  padding: 36px;
  max-width: 440px;
  margin: 0 auto;
  box-shadow: var(--lc-shadow-md);
}

.demo-card__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--lc-text);
  margin-bottom: 6px;
}

.demo-card__sub {
  font-size: 14px;
  color: var(--lc-text-muted);
  margin-bottom: 24px;
}

.form-field { margin-bottom: 16px; }

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--lc-text);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--lc-border);
  border-radius: var(--lc-radius);
  font-size: 14px;
  font-family: var(--lc-font);
  color: var(--lc-text);
  background: var(--lc-bg);
  outline: none;
  transition: border-color .15s;
}

.form-input:focus { border-color: var(--lc-accent); }

.form-submit {
  width: 100%;
  margin-top: 8px;
}

.alert {
  padding: 12px 16px;
  border-radius: var(--lc-radius);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 20px;
}

.alert--success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.alert--error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.demo-options {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.demo-options__label {
  font-size: 12px;
  color: var(--lc-text-faint);
  display: flex;
  align-items: center;
  margin-right: 4px;
}

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  background: var(--lc-footer-bg);
  border-top: 1px solid var(--lc-footer-border);
  padding: 48px 0 32px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.site-footer__brand { }

.site-footer__logo {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  margin-bottom: 12px;
}

.site-footer__logo-text {
  font-size: 16px;
  font-weight: 700;
  color: #f8fafc;
}

.site-footer__tagline {
  font-size: 13px;
  color: var(--lc-footer-text);
  line-height: 1.6;
  max-width: 240px;
  margin-bottom: 16px;
}

.site-footer__vcaptcha {
  font-size: 12px;
  color: var(--lc-footer-text);
}

.site-footer__vcaptcha a { color: var(--lc-accent); }

.site-footer__col-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: #f8fafc;
  margin-bottom: 14px;
}

.site-footer__col-links { list-style: none; }

.site-footer__col-links li { margin-bottom: 8px; }

.site-footer__col-links a {
  font-size: 13px;
  color: var(--lc-footer-text);
  transition: color .15s;
}

.site-footer__col-links a:hover { color: var(--lc-footer-link); }

.site-footer__bottom {
  border-top: 1px solid var(--lc-footer-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer__copy {
  font-size: 12px;
  color: var(--lc-footer-text);
}

.site-footer__mit {
  font-size: 12px;
  color: var(--lc-footer-text);
  background: #1e293b;
  padding: 4px 10px;
  border-radius: 4px;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .docs-layout { grid-template-columns: 1fr; }
  .docs-sidebar { position: static; height: auto; border-right: none; border-bottom: 1px solid var(--lc-border); padding: 20px 0; }
  .docs-content { padding: 32px 24px; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .site-nav__links { display: none; }
  .hero { padding: 52px 0 48px; }
  .hero__sub { font-size: 16px; }
  .site-footer__grid { grid-template-columns: 1fr; }
  .stats__grid { grid-template-columns: 1fr 1fr; }
}