/* ============================================================
   随练技术工具 — 设计稿严格还原样式
   设计令牌提取自 Ardot 画布 (file 701588809122231)
   ============================================================ */

:root {
  /* 配色 */
  --canvas: #F7F8FC;        /* 画布底色 */
  --card: #FFFFFF;          /* 卡片/Header/Footer 白 */
  --border: #E5E7EB;        /* 发丝边框 */
  --text: #111111;          /* 主文字 */
  --text-2: #6B6B6B;        /* 次级文字 */
  --text-3: #9AA0A6;        /* 弱化文字（页脚/备案） */
  --primary: #1A73E8;       /* 主行动蓝 */
  --primary-soft: #E8F0FE;  /* CTA 浅蓝底 / Badge 底 */
  --success: #10B981;       /* 代码字符串绿 */
  --star: #F5B400;          /* 星标金 */
  --code-bar: #F7F7F7;      /* 代码窗口标题栏 */

  /* 阴影 */
  --shadow-card: 0 2px 8px rgba(59, 63, 67, 0.06);
  --shadow-code: 0 12px 32px rgba(59, 63, 67, 0.10);

  /* 圆角 */
  --r-card: 12px;
  --r-pill: 999px;
  --r-cta: 16px;

  /* 字体 */
  --font-cn: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-en: "Inter Tight", "Noto Sans SC", sans-serif;
  --font-code: "Source Code Pro", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--canvas);
  color: var(--text);
  font-family: var(--font-cn);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
}

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

/* ============ Header ============ */
.site-header {
  background: var(--card);
}
.nav-row {
  height: 72px;
  padding: 0 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo { display: inline-flex; }
.wordmark {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.2s ease;
}
.nav-link:hover { color: var(--primary); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.2s ease;
}
.nav-cta:hover { background: #1666d6; }
.header-divider {
  height: 1px;
  background: var(--border);
  width: 100%;
}

/* ============ Hero ============ */
.hero {
  display: flex;
  align-items: center;
  gap: 56px;
  padding: 96px 64px 80px;
}
.hero-text {
  width: 560px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 24px;
}
.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
}
.hero-title {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--text);
}
.hero-sub {
  font-size: 19px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-2);
}
.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-pill);
  font-size: 16px;
  font-weight: 600;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.btn-primary {
  padding: 14px 28px;
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: #1666d6; }
.btn-secondary {
  padding: 14px 28px;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: #d3d6db; }

/* 代码窗口 */
.code-window {
  width: 480px;
  height: 320px;
  background: var(--card);
  border-radius: var(--r-card);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-code);
  flex-shrink: 0;
}
.code-titlebar {
  height: 40px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--code-bar);
}
.dot { width: 10px; height: 10px; border-radius: 999px; }
.dot-red { background: #FF5F56; }
.dot-yellow { background: #FFBD2E; }
.dot-green { background: #27C93F; }
.code-filename {
  margin-left: 8px;
  font-family: var(--font-code);
  font-size: 12px;
  color: var(--text-3);
}
.code-body { padding: 20px; }
.code-pre {
  font-family: var(--font-code);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  white-space: pre;
  margin: 0;
}
.c-comment { color: var(--text-3); }
.c-code, .c-key { color: var(--text); }
.c-str { color: var(--success); }
.c-fn { color: var(--text); }

/* ============ 通用 Section ============ */
.section {
  padding: 88px 64px;
  display: flex;
  flex-direction: column;
  gap: 48px;
}
.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}
.kicker {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--primary);
}
.section-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--text);
}
.section-desc {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-2);
  max-width: 720px;
}

/* ============ 卡片网格 ============ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}
.card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 28px;
  border-radius: var(--r-card);
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.card:hover {
  box-shadow: 0 8px 24px rgba(59, 63, 67, 0.10);
  transform: translateY(-2px);
}
.card-tag {
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
}
.card-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}
.card-desc {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-2);
}
.card-link {
  margin-top: auto;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  transition: opacity 0.2s ease;
}
.card-link:hover { opacity: 0.75; }

/* 项目卡片 */
.proj-top {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.proj-name {
  font-family: var(--font-code);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}
.proj-star {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--text-2);
}
.proj-tags {
  font-size: 13px;
  color: var(--text-2);
}

/* 工具卡片图标 */
.tool-icon { display: inline-flex; }

/* ============ 关于我 ============ */
.about-body {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}
.bio-card {
  width: 540px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 32px;
  border-radius: var(--r-card);
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}
.bio-title { font-size: 22px; font-weight: 600; color: var(--text); }
.bio-text { font-size: 15px; line-height: 1.6; color: var(--text-2); }
.bio-contact { font-size: 14px; color: var(--text-2); }
.stack-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 32px;
  border-radius: var(--r-card);
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}
.stack-title { font-size: 18px; font-weight: 600; color: var(--text); }
.tags-row { display: flex; flex-wrap: wrap; gap: 12px; }
.pill {
  padding: 8px 14px;
  border-radius: var(--r-pill);
  background: #F7F7F7;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-2);
}

/* ============ 收尾 CTA ============ */
.final-cta-wrap { padding: 0 64px 88px; }
.final-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 64px;
  border-radius: var(--r-cta);
  background: var(--primary-soft);
  text-align: center;
}
.cta-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text);
}
.cta-sub {
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-2);
}

/* ============ Footer ============ */
.site-footer {
  background: var(--card);
  padding: 56px 64px 40px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}
.footer-divider { height: 1px; background: var(--border); width: 100%; }
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 40px;
}
.footer-brand { width: 320px; display: flex; flex-direction: column; gap: 12px; }
.footer-brand-name { font-size: 16px; font-weight: 600; color: var(--text); }
.footer-tagline { font-size: 14px; line-height: 1.6; color: var(--text-2); }
.footer-links { display: flex; gap: 56px; }
.link-col { display: flex; flex-direction: column; gap: 12px; }
.link-col-title { font-size: 13px; font-weight: 500; color: var(--text-3); }
.link-col a {
  font-size: 14px;
  color: var(--text-2);
  transition: color 0.2s ease;
}
.link-col a:hover { color: var(--primary); }

.footer-icp {
  /* 备案号占位，暂未填写真实信息，先隐藏；填入真实号后改回 display: flex */
  display: none;
  flex-direction: column;
  gap: 6px;
}
.icp-line { font-size: 13px; color: var(--text-3); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.copyright, .disclaimer { font-size: 13px; color: var(--text-3); }

/* ============================================================
   响应式（桌面 1440 为设计基准；以下仅做优雅降级，不破坏桌面还原）
   ============================================================ */
@media (max-width: 1080px) {
  .hero { flex-direction: column; align-items: flex-start; }
  .hero-text, .code-window { width: 100%; }
  .about-body { flex-direction: column; }
  .bio-card { width: 100%; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav-row { padding: 0 24px; }
  .nav-links { display: none; }
  .hero, .section, .final-cta-wrap { padding-left: 24px; padding-right: 24px; }
  .site-footer { padding: 40px 24px 32px; }
  .hero-title { font-size: 40px; }
  .section-title { font-size: 28px; }
  .grid-3 { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; }
}