/* ============================================================
   周园鑫 · 个人网站  全站样式
   技术蓝图风：编号分区 / 等宽字体标签 / 细线网格 / 深浅双色
   ============================================================ */

:root {
  --bg: #fafaf7;
  --bg-raised: #ffffff;
  --ink: #1a1d21;
  --ink-soft: #4b5563;
  --ink-faint: #9aa3af;
  --line: #e3e1da;
  --accent: #1d4ed8;
  --accent-soft: rgba(29, 78, 216, 0.08);
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

[data-theme="dark"] {
  --bg: #101418;
  --bg-raised: #161b21;
  --ink: #e8eaed;
  --ink-soft: #a8b3c1;
  --ink-faint: #5d6b7d;
  --line: #2a323d;
  --accent: #6ea8fe;
  --accent-soft: rgba(110, 168, 254, 0.1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  transition: background 0.3s ease, color 0.3s ease;
}

::selection { background: var(--accent); color: #fff; }

.wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶栏 ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.brand {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ink);
  text-decoration: none;
}
.brand b { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 20px; }
.nav-links a {
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.theme-toggle {
  border: 1px solid var(--line);
  background: none;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 分区通用 ---------- */
section { border-bottom: 1px solid var(--line); padding: 64px 0; }

.sec-label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  margin-bottom: 32px;
}
.sec-label::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.sec-label b { color: var(--accent); font-weight: 600; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 72px; }
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(40px, 8vw, 64px);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
}
/* 编程字体问候语 + 闪烁光标 */
.hero h1.hero-mono {
  font-family: var(--mono);
  font-size: clamp(22px, 4.2vw, 38px);
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.5;
}
.hero h1 .cursor {
  display: inline-block;
  width: 0.55em;
  height: 1.05em;
  margin-left: 4px;
  vertical-align: -0.16em;
  background: var(--accent);
  animation: cursor-blink 1.1s steps(1) infinite;
}
@keyframes cursor-blink { 50% { opacity: 0; } }
/* 打字结束后：光标蓝芒闪耀 */
.hero h1 .cursor.shine {
  animation: cursor-shine 1.5s ease-in-out infinite;
}
@keyframes cursor-shine {
  0%, 100% { opacity: 1; box-shadow: 0 0 6px var(--accent), 0 0 16px var(--accent); }
  50% { opacity: 0.75; box-shadow: 0 0 14px var(--accent), 0 0 36px var(--accent), 0 0 60px var(--accent); }
}
@media (prefers-reduced-motion: reduce) {
  .hero h1 .cursor { animation: none; }
  .hero h1 .cursor.shine { animation: none; box-shadow: 0 0 10px var(--accent); }
}
.hero .tagline {
  margin-top: 16px;
  font-size: 18px;
  color: var(--ink-soft);
}
.hero .links { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }
.chip {
  font-family: var(--mono);
  font-size: 13px;
  padding: 6px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: all 0.2s;
  background: none;
  cursor: pointer;
}
.chip.copied { border-color: var(--accent); background: var(--accent); color: #fff; font-weight: 600; }

/* 复制成功的底部提示条 */
.copy-toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%) translateY(12px);
  background: var(--ink);
  color: var(--bg);
  font-family: var(--mono);
  font-size: 13px;
  padding: 10px 20px;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 60;
}
.copy-toast.show { opacity: 1; transform: translateX(-50%); }
.copy-toast b { color: var(--accent); filter: brightness(1.6); font-weight: 600; }
.chip:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.chip-primary {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

/* ---------- 技能栈 ---------- */
.skills { display: flex; flex-direction: column; gap: 16px; }
.skills-group { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.skills-cat {
  flex: none;
  width: 96px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}
.skill {
  font-family: var(--mono);
  font-size: 13px;
  padding: 4px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  transition: all 0.2s;
}
.skill:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 实习经历时间线（可点击展开） ---------- */
.exp-group-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--ink-faint);
  margin: 28px 0 16px;
}
.exp-group-label:first-of-type { margin-top: 0; }
.timeline { list-style: none; }
.timeline li {
  position: relative;
  padding: 0 0 20px 28px;
  border-left: 1px solid var(--line);
}
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  z-index: 1;
}

.exp-head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-raised);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: inherit;
  transition: border-color 0.2s;
}
.exp-head:hover { border-color: var(--accent); }

.exp-logo {
  flex: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.exp-logo img { width: 28px; height: 28px; object-fit: contain; }
.exp-logo .logo-text {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.02em;
}
.logo-aia { color: #d22630; font-size: 15px; }
.logo-badge {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.exp-main { min-width: 0; flex: 1; }
.exp-company { font-weight: 600; font-size: 15px; display: block; }
.exp-role { font-size: 13px; color: var(--ink-soft); display: block; margin-top: 1px; }
.exp-date {
  flex: none;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}
.exp-toggle {
  flex: none;
  font-family: var(--mono);
  font-size: 16px;
  color: var(--ink-faint);
  transition: transform 0.25s ease;
}
.exp.open .exp-toggle { transform: rotate(45deg); color: var(--accent); }

.exp-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}
.exp.open .exp-body { grid-template-rows: 1fr; }
.exp-body-inner { overflow: hidden; }
.exp-body-content {
  padding: 14px 16px 4px;
  font-size: 14px;
  color: var(--ink-soft);
}
.exp-body-content p { margin-bottom: 0.8em; }
.exp-body-content strong { color: var(--ink); }
.exp-body-content ul { padding-left: 1.2em; margin-bottom: 0.8em; }
.exp-body-content li { margin-bottom: 0.4em; border: none; padding: 0; }
.exp-body-content li::before { display: none; }

/* 经历条目里的文章/报道链接 */
.exp-article { margin-top: 12px; }
.exp-article a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 13.5px;
  color: var(--accent);
  text-decoration: none;
  border-left: 3px solid var(--accent);
  padding-left: 10px;
  transition: opacity 0.2s;
}
.exp-article a:hover { opacity: 0.75; text-decoration: underline; }

/* ---------- 项目卡片 ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: var(--bg-raised);
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { font-size: 16px; font-weight: 600; }
.card h3 a { color: inherit; text-decoration: none; }
.card h3 a:hover { color: var(--accent); }
.card p { font-size: 14px; color: var(--ink-soft); margin-top: 8px; }
.card .tags { margin-top: 14px; display: flex; gap: 8px; flex-wrap: wrap; }
.card .tags span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ---------- 随笔列表 ---------- */
.post-list { list-style: none; }
.post-list li { border-bottom: 1px solid var(--line); }
.post-list li:last-child { border-bottom: none; }
.post-list a {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 18px 8px;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s;
}
.post-list a:hover { background: var(--accent-soft); }
.post-list .p-date {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  white-space: nowrap;
}
.post-list .p-title { font-weight: 600; }
.post-list .p-summary { font-size: 13px; color: var(--ink-faint); margin-left: auto; }

/* ---------- 文章页 ---------- */
.post-header { padding: 72px 0 40px; border-bottom: 1px solid var(--line); }
.post-header h1 {
  font-family: var(--serif);
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  line-height: 1.35;
}
.post-meta {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}
.post-body { padding: 48px 0 72px; }
.post-body p { margin-bottom: 1.4em; }
.post-body h2 {
  font-family: var(--serif);
  font-size: 22px;
  margin: 2em 0 0.8em;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
}
.post-body blockquote {
  border-left: 3px solid var(--line);
  padding-left: 16px;
  color: var(--ink-soft);
  margin-bottom: 1.4em;
}
.post-body code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--accent-soft);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ---------- 整卡可点击的项目卡片 + 徽章行 ---------- */
a.card { display: block; text-decoration: none; color: inherit; }
.card .badges { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px; }
.card .badges img { height: 18px; display: block; }

/* ---------- 「很火」项目：旋转火焰描边 + 光晕 ---------- */
/* 用 border-box 渐变实现：渐变只存在于边框那一圈，任何状态都不会淹没卡片内容 */
@property --fire-a { syntax: '<angle>'; initial-value: 0deg; inherits: false; }
.card { position: relative; }
.card.hot {
  border: 1.5px solid transparent;
  background:
    linear-gradient(var(--bg-raised), var(--bg-raised)) padding-box,
    conic-gradient(from var(--fire-a),
      #ff6a33, #ffb35c, #ff6a33, #ff8c42, #ff6a33) border-box;
  animation: fire-spin 6s linear infinite;
  box-shadow: 0 0 22px rgba(255, 107, 51, .32), 0 0 56px rgba(255, 140, 66, .18);
}
.card.hot:hover { border-color: transparent; transform: none; }
@keyframes fire-spin { to { --fire-a: 360deg; } }
.hot-badge {
  display: none;
  margin-left: 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(90deg, #ff6a33, #ff8c42);
  vertical-align: 3px;
  animation: hot-pulse 1.2s ease-in-out infinite;
}
.card.hot .hot-badge { display: inline-block; }
@keyframes hot-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}
@media (prefers-reduced-motion: reduce) {
  .card.hot, .hot-badge { animation: none; }
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 20;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  color: var(--ink-soft);
  font-size: 16px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.25s ease;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 页脚 ---------- */
.site-footer { padding: 40px 0; }
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}
.site-footer a { color: var(--ink-faint); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

/* ---------- 滚动入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 手机适配 ---------- */
@media (max-width: 560px) {
  section { padding: 48px 0; }
  .hero { padding: 64px 0 48px; }
  .post-list a { flex-wrap: wrap; gap: 4px 12px; }
  .post-list .p-summary { margin-left: 0; width: 100%; }
  .nav-links { gap: 14px; }
  .exp-head { flex-wrap: wrap; }
  .exp-date { width: 100%; order: 3; padding-left: 54px; }
}