@import url('tokens.css');

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.2s, color 0.2s;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
ul { list-style: none; }

/* Layout */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
section { padding: 72px 0; }
.section--subtle { background: var(--bg-subtle); }

/* Typography helpers */
.eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 900; line-height: 1.15; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 800; margin-bottom: 16px; }
h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.accent { color: var(--accent); }

/* NAV */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
  transition: background 0.2s, border-color 0.2s;
}
.nav__inner {
  max-width: 1100px; margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center;
  justify-content: space-between; gap: 24px;
}
.nav__logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 800; font-size: 1rem;
  color: var(--text-primary); text-decoration: none; flex-shrink: 0;
}
.nav__logo-mark {
  display: inline-block; width: 22px; height: 22px;
  background: var(--accent); border-radius: 5px;
}
.nav__links { display: flex; align-items: center; gap: 24px; font-size: 0.875rem; }
.nav__links a { color: var(--text-muted); font-weight: 500; white-space: nowrap; }
.nav__links a:hover { color: var(--text-primary); text-decoration: none; }

/* Theme switcher */
.theme-switcher {
  display: flex; gap: 2px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 6px; padding: 3px;
}
.theme-btn {
  background: none; border: none; cursor: pointer;
  padding: 3px 8px; border-radius: 4px;
  font-size: 0.85rem; color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
}
.theme-btn[aria-pressed="true"],
.theme-btn:hover { background: var(--accent-bg); color: var(--accent); }

/* Hamburger */
.nav__hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav__hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--text-primary); border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

@media (max-width: 768px) {
  .nav__hamburger { display: flex; }
  .nav__links {
    display: none; position: absolute;
    top: var(--nav-height); left: 0; right: 0;
    background: var(--bg-base); border-bottom: 1px solid var(--border);
    flex-direction: column; align-items: flex-start;
    gap: 0; padding: 12px 24px 20px; z-index: 99;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { padding: 10px 0; width: 100%; border-bottom: 1px solid var(--border); }
  .theme-switcher { margin-top: 12px; }
}

/* HERO */
.hero {
  background: linear-gradient(160deg, var(--hero-grad-a) 0%, var(--hero-grad-b) 100%);
  text-align: center; padding: 96px 0;
}
.hero__sub {
  color: var(--text-muted); font-size: 1.05rem;
  max-width: 520px; margin: 16px auto 32px;
}
.hero__ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 11px 24px; border-radius: var(--radius);
  font-weight: 700; font-size: 0.9rem; cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.1s;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn--primary {
  background: var(--accent); color: #fff; border: 2px solid var(--accent);
}
.btn--primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn--outline {
  background: transparent; color: var(--text-primary); border: 2px solid var(--border);
}
.btn--outline:hover { border-color: var(--accent); color: var(--accent); }

/* STATS */
.stats { padding: 32px 0; }
.stats__grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 0; text-align: center;
}
.stats__item { padding: 16px; border-right: 1px solid var(--border); }
.stats__item:last-child { border-right: none; }
.stats__item dt {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 4px;
}
.stats__item dd { font-size: 1.8rem; font-weight: 900; color: var(--accent); line-height: 1; }

@media (max-width: 640px) {
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stats__item:nth-child(2) { border-right: none; }
  .stats__item:nth-child(3) { border-right: 1px solid var(--border); }
  .stats__item { border-bottom: 1px solid var(--border); }
  .stats__item:nth-child(3), .stats__item:nth-child(4) { border-bottom: none; }
}

/* CARDS */
.cards { display: grid; gap: 16px; margin-top: 32px; }
.cards--2 { grid-template-columns: repeat(2, 1fr); }
.cards--3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 768px) { .cards--3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .cards--2, .cards--3 { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-base); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s, border-color 0.15s;
}
.card:hover { box-shadow: var(--shadow-md); }
.card--featured { border: 2px solid var(--accent); }
.card--link { display: block; color: var(--text-primary); text-decoration: none; }
.card--link:hover { border-color: var(--accent); color: var(--text-primary); text-decoration: none; }
.card__icon { font-size: 1.8rem; margin-bottom: 12px; }

/* WHAT IS TC */
.what__desc { color: var(--text-muted); max-width: 680px; margin-bottom: 8px; }

/* BRANCHES */
.branch-label {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 4px;
}
.branch-version {
  font-size: 1.1rem; font-weight: 800; color: var(--text-primary);
  margin-bottom: 4px; font-family: monospace;
}
.branch-desc { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 12px; }
.branch-badge { display: block; margin-bottom: 12px; height: 20px; }
.branch-links { display: flex; gap: 16px; font-size: 0.85rem; font-weight: 600; }

/* QUICKSTART */
.quickstart .card ul { margin-top: 8px; display: flex; flex-direction: column; gap: 4px; }
.quickstart .card li {
  font-size: 0.875rem; color: var(--text-muted);
  padding-left: 14px; position: relative;
}
.quickstart .card li::before {
  content: '\2713'; position: absolute; left: 0;
  color: var(--accent); font-size: 0.75rem;
}
.quickstart__cta { margin-top: 32px; text-align: center; }

/* ACTIVITY */
.activity__grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 32px; margin-top: 32px;
}
@media (max-width: 640px) { .activity__grid { grid-template-columns: 1fr; } }
.activity__branch {
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted);
  padding-bottom: 10px; border-bottom: 1px solid var(--border); margin-bottom: 12px;
}
.commit-list { display: flex; flex-direction: column; gap: 10px; }
.commit-list__loading { font-size: 0.85rem; color: var(--text-muted); }
.commit-item { font-size: 0.85rem; line-height: 1.4; }
.commit-item__sha { font-family: monospace; font-size: 0.78rem; color: var(--accent); margin-right: 6px; }
.commit-item__msg { color: var(--text-primary); }
.commit-item__meta { color: var(--text-muted); font-size: 0.75rem; margin-top: 2px; }
.commit-fallback { font-size: 0.85rem; color: var(--text-muted); }
.commit-fallback a { font-weight: 600; }

/* STEPPER */
.stepper {
  display: flex; gap: 0; margin: 32px 0;
  list-style: none; position: relative;
}
.stepper::before {
  content: ''; position: absolute; top: 20px; left: 20px; right: 20px;
  height: 2px; background: var(--border); z-index: 0;
}
.stepper__step {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; text-align: center; gap: 12px;
  position: relative; z-index: 1; padding: 0 12px;
}
.stepper__num {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--accent-bg); border: 2px solid var(--accent);
  color: var(--accent); font-weight: 900; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
}
.stepper__body strong { display: block; font-size: 0.95rem; color: var(--text-primary); margin-bottom: 4px; }
.stepper__body p { font-size: 0.825rem; color: var(--text-muted); }
.stepper__body code {
  font-size: 0.8rem; background: var(--bg-subtle);
  padding: 1px 5px; border-radius: 3px; border: 1px solid var(--border);
}
@media (max-width: 640px) {
  .stepper { flex-direction: column; gap: 20px; }
  .stepper::before { display: none; }
  .stepper__step { flex-direction: row; text-align: left; align-items: flex-start; }
  .stepper__num { flex-shrink: 0; }
}
.contribute__links { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.contribute__links a {
  padding: 8px 16px; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 0.875rem; font-weight: 600;
  color: var(--text-primary); transition: border-color 0.15s, color 0.15s;
}
.contribute__links a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* FOOTER */
.footer {
  background: var(--accent-bg); border-top: 1px solid var(--border);
  padding: 48px 0; text-align: center;
}
.footer__brand {
  display: flex; align-items: center; justify-content: center;
  gap: 8px; font-weight: 800; font-size: 1rem;
  color: var(--text-primary); margin-bottom: 16px;
}
.footer__license { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 12px; }
.footer__legal {
  font-size: 0.8rem; color: var(--text-muted);
  max-width: 560px; margin: 0 auto 24px; line-height: 1.7;
}
.footer__nav { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; font-size: 0.85rem; }
.footer__nav a { color: var(--text-muted); font-weight: 500; }
.footer__nav a:hover { color: var(--accent); text-decoration: none; }