/* Lepton — lepton.me */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --fg: #111827;
  --fg-soft: #374151;
  --muted: #6b7280;
  --border: #e5e7eb;
  --card: #ffffff;
  --accent: #059669;
  --accent-hover: #047857;
  --accent-soft: #ecfdf5;
  --on-accent: #ffffff;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
  --radius: 16px;
  --max: 1040px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d10;
    --bg-soft: #13161b;
    --fg: #f3f4f6;
    --fg-soft: #d1d5db;
    --muted: #9ca3af;
    --border: #23272f;
    --card: #14171c;
    --accent: #34d399;
    --accent-hover: #6ee7b7;
    --accent-soft: rgba(52, 211, 153, 0.12);
    --on-accent: #052e1f;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

/* 中英文切换：<span class="zh"> / <span class="en"> */
html[data-lang="zh"] .en,
html[data-lang="en"] .zh {
  display: none !important;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

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

code, kbd {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.9em;
}

kbd {
  display: inline-block;
  padding: 1px 7px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--bg-soft);
  color: var(--fg);
  white-space: nowrap;
}

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

@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
}

/* 顶栏 */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav .wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--fg);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--fg); }
.brand svg { width: 26px; height: 26px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: auto;
  font-size: 15px;
}
.nav-links a { color: var(--fg-soft); }
.nav-links a:hover { color: var(--fg); }

.lang-toggle {
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--fg-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  cursor: pointer;
}
.lang-toggle:hover { color: var(--fg); }

/* 按钮 */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); color: var(--on-accent); }
.btn-ghost { border-color: var(--border); color: var(--fg); }
.btn-ghost:hover { border-color: var(--fg-soft); color: var(--fg); }
.btn-sm { padding: 7px 16px; font-size: 14px; }

/* 首页 */

.hero {
  padding-block: 96px 64px;
  text-align: center;
}

.hero h1 {
  margin: 0 auto;
  max-width: 14em;
  font-size: clamp(36px, 6vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.hero p {
  margin: 20px auto 0;
  max-width: 36em;
  color: var(--muted);
  font-size: 18px;
}

.section { padding-block: 32px 72px; }

@media (max-width: 600px) {
  .hero { padding-block: 56px 40px; }
  .hero p { font-size: 16px; }
  .tool-card { padding: 22px; }
}

.section-title {
  margin: 0 0 24px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.tools {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
}
.tool-card:hover { transform: translateY(-2px); }

.tool-card .icon { width: 72px; height: 72px; }

.tool-card h3 { margin: 0; font-size: 22px; letter-spacing: -0.01em; }
.tool-card h3 a { color: var(--fg); }

.tool-card p { margin: 0; color: var(--fg-soft); flex: 1; }

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

.chip {
  font-size: 12.5px;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--muted);
}

.card-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 4px; }

.principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  padding: 56px 0;
  border-top: 1px solid var(--border);
}

.principles h3 { margin: 12px 0 6px; font-size: 17px; }
.principles p { margin: 0; color: var(--muted); font-size: 15px; }
.principles svg { width: 28px; height: 28px; color: var(--accent); }

.about {
  padding-block: 56px 80px;
  border-top: 1px solid var(--border);
}
.about h2 { margin: 0 0 16px; font-size: 28px; letter-spacing: -0.02em; }
.about p { margin: 0 0 14px; max-width: 40em; color: var(--fg-soft); font-size: 17px; }
.about .btn { margin-top: 10px; }

.footer nav { flex-wrap: wrap; }

/* 工具页 */

.back { display: inline-block; margin-top: 32px; font-size: 14px; color: var(--muted); }
.back:hover { color: var(--fg); }

.product-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 40px 0 48px;
}

.product-hero .icon { width: 128px; height: 128px; }

.product-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(36px, 6vw, 52px);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.product-hero .tagline {
  margin: 14px auto 0;
  max-width: 32em;
  font-size: 19px;
  color: var(--fg-soft);
}

.product-hero .actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 28px;
}

.meta {
  margin-top: 16px;
  font-size: 14px;
  color: var(--muted);
}

.notice {
  max-width: 40em;
  margin: 20px auto 0;
  font-size: 14px;
  color: var(--muted);
}

.shot {
  margin: 0 auto 72px;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.shot-narrow { max-width: 760px; }
.shot video { display: block; width: 100%; height: auto; background: #000; }

.lead {
  margin: 0;
  max-width: 46em;
  font-size: 17px;
  color: var(--fg-soft);
}

.shots-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  align-items: start;
  margin-bottom: 72px;
}

.shots-row figure { margin: 0; }
.shots-row img { margin: 0 auto; border-radius: 12px; }
.shots-row figcaption { margin-top: 10px; text-align: center; font-size: 14px; color: var(--muted); }

.content h2 {
  margin: 0 0 24px;
  font-size: 28px;
  letter-spacing: -0.02em;
}

.content section { margin-bottom: 72px; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.feature {
  padding: 22px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.feature h3 { margin: 0 0 6px; font-size: 16px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }

.steps { margin: 0; padding-left: 1.4em; }
.steps li { margin-bottom: 10px; color: var(--fg-soft); }
.steps li::marker { color: var(--accent); font-weight: 700; }

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
th, td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th { font-weight: 600; color: var(--muted); font-size: 13px; }
td:first-child { white-space: nowrap; width: 200px; }

.faq details {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "+";
  display: inline-block;
  width: 1.2em;
  color: var(--accent);
  font-weight: 700;
}
.faq details[open] summary::before { content: "−"; }
.faq details p { margin: 10px 0 0 1.2em; color: var(--fg-soft); }

.cta {
  text-align: center;
  padding: 56px 24px;
  margin-bottom: 72px;
  background: var(--accent-soft);
  border-radius: var(--radius);
}
.cta h2 { margin: 0 0 20px; }

/* 页脚 */

.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0 48px;
  font-size: 14px;
  color: var(--muted);
}
.footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.footer a { color: var(--muted); }
.footer a:hover { color: var(--fg); }
.footer nav { display: flex; gap: 20px; }

/* 404 */

.not-found { text-align: center; padding: 120px 0; }
.not-found h1 { font-size: 64px; margin: 0; letter-spacing: -0.04em; }
.not-found p { color: var(--muted); }