/* Crank 官网 — 风格参考 rakazo.com：off-white 底、墨色文字、单一蓝色强调、
   大圆角卡片、柔和的阴影。 */

:root {
  --page: #fdfdfd;
  --surface: #ffffff;
  --ink: #242424;
  --body: #3d3d3d;
  --muted: #848484;
  --line: #efefef;
  --blue: #2563eb;
  --blue-soft: #eff6ff;
  --blue-line: #d6e8fc;
  --radius-card: 20px;
  --radius-frame: 26px;
  --shadow-soft: 0 2px 16px rgba(0, 0, 0, 0.03);
  --shadow-demo: 0 30px 80px -30px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", "Noto Sans", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- header ---------- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1040px;
  margin: 0 auto;
  padding: 24px 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.brand-mark {
  display: block;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 150ms ease;
}

.github-link:hover {
  color: var(--ink);
}

.github-link .external {
  opacity: 0.6;
}

.language-switch {
  display: flex;
  gap: 2px;
  padding: 2px;
  border-radius: 8px;
  background: #f1f1f0;
}

.language-switch button {
  border: 0;
  border-radius: 6px;
  padding: 3px 9px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: color 120ms ease, background 120ms ease, box-shadow 120ms ease;
}

.language-switch button:hover {
  color: var(--ink);
}

.language-switch button.is-on {
  background: #fff;
  color: var(--ink);
  box-shadow: 0 0 0 1px var(--line), 0 1px 2px rgba(0, 0, 0, 0.06);
}

/* ---------- hero ---------- */

.hero {
  max-width: 780px;
  margin: 0 auto;
  padding: 72px 28px 40px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 22px;
  font-size: 52px;
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.hero-sub {
  margin: 0 auto 34px;
  max-width: 620px;
  color: var(--body);
  font-size: 18px;
}

.button {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  transition: box-shadow 150ms ease, background 150ms ease;
}

.button--primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.2);
}

.button--primary:hover {
  box-shadow: 0 10px 28px rgba(37, 99, 235, 0.28);
}

.hero-meta {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 13px;
}

/* ---------- big demo video ---------- */

.hero-shot {
  max-width: 1280px;
  margin: 8px auto 0;
  padding: 0 28px;
}

.hero-shot img,
.hero-frame {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-frame);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-demo);
  background: var(--surface);
}

/* 播放器自己会在画面左右留一两像素黑边，把 iframe 稍微撑大再裁掉。 */
.hero-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.hero-frame iframe {
  position: absolute;
  top: -2px;
  left: -2px;
  width: calc(100% + 4px);
  height: calc(100% + 4px);
  border: 0;
  display: block;
}

/* ---------- supports ---------- */

.supports {
  max-width: 1040px;
  margin: 0 auto;
  padding: 96px 28px 40px;
}

.supports h2 {
  margin: 0 0 26px;
  font-size: 28px;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.supports-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.support-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft);
  padding: 26px 26px 24px;
}

.support-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.support-card p {
  margin: 0 0 18px;
  color: var(--body);
  font-size: 14px;
}

.support-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.support-tags code {
  padding: 3px 9px;
  border: 1px solid var(--blue-line);
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
}

/* ---------- footer ---------- */

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1040px;
  margin: 64px auto 0;
  padding: 22px 28px 40px;
  border-top: 1px solid var(--line);
  color: var(--body);
  font-size: 13px;
}

.footer-muted {
  color: var(--muted);
}

/* ---------- narrow screens ---------- */

@media (max-width: 1040px) {
  .supports-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .hero {
    padding-top: 48px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .supports-grid {
    grid-template-columns: 1fr;
  }
}