/* =========================================================
   李乾 · 技术高级岗 / 后端架构师简历  —  设计还原自 Figma Make
   配色: #080808 底色 + #00c896 亮绿强调
   字体: DM Serif Display(标题) / DM Sans(正文) / JetBrains Mono(标签·数据)
   ========================================================= */

:root {
  --bg: #080808;
  --surface: #0e0e11;
  --surface-2: #141418;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #ededed;
  --muted: #8b8b93;
  --faint: #5a5a62;
  --accent: #00c896;
  --accent-soft: rgba(0, 200, 150, 0.12);
  --accent-line: rgba(0, 200, 150, 0.35);

  --serif: "DM Serif Display", Georgia, "Songti SC", serif;
  --sans: "DM Sans", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;

  --maxw: 1120px;
  --radius: 16px;
  --radius-sm: 10px;
  --pad: clamp(20px, 5vw, 64px);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

/* 顶部滚动进度条 */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--accent); z-index: 100;
  box-shadow: 0 0 12px rgba(0, 200, 150, 0.6);
  transition: width 0.1s linear;
}

/* ============ 导航 ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--pad);
  z-index: 90;
  background: rgba(8, 8, 8, 0.55);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.nav.is-scrolled { border-bottom-color: var(--border); background: rgba(8, 8, 8, 0.85); }

.nav__brand {
  font-family: var(--mono); font-weight: 700; font-size: 15px;
  letter-spacing: 0.02em; display: flex; align-items: center; gap: 8px;
}
.nav__dot {
  width: 9px; height: 9px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 10px var(--accent); animation: pulse 2.4s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }
.nav__brand-sub { color: var(--faint); font-weight: 400; }

.nav__links { display: flex; gap: 30px; list-style: none; }
.nav__links a {
  font-family: var(--mono); font-size: 13px; color: var(--muted);
  letter-spacing: 0.04em; position: relative; transition: color 0.2s;
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; height: 2px; width: 0;
  background: var(--accent); transition: width 0.25s;
}
.nav__links a:hover, .nav__links a.is-active { color: var(--text); }
.nav__links a.is-active::after { width: 100%; }

/* ============ HERO ============ */
.hero { min-height: 100vh; display: flex; align-items: center; padding: 120px var(--pad) 80px; }
.hero__inner {
  max-width: var(--maxw); margin: 0 auto; width: 100%;
  display: grid; grid-template-columns: 1.3fr 1fr; gap: clamp(32px, 6vw, 80px);
  align-items: center;
}
.hero__eyebrow {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.12em;
  color: var(--accent); margin-bottom: 22px;
}
.hero__name {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(56px, 11vw, 128px); line-height: 0.95;
  letter-spacing: -0.01em; margin-bottom: 28px;
}
.hero__bio { color: var(--muted); font-size: clamp(14px, 1.5vw, 16.5px); max-width: 62ch; margin-bottom: 36px; line-height: 1.7; }
.bio__item { display: block; position: relative; padding-left: 18px; margin-bottom: 10px; }
.bio__item::before { content: "›"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.04em;
  padding: 13px 26px; border-radius: 999px; transition: transform 0.2s, background 0.2s, border-color 0.2s;
  border: 1px solid transparent; cursor: pointer; display: inline-flex; align-items: center;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--accent); color: #04221a; font-weight: 700; }
.btn--primary:hover { box-shadow: 0 8px 30px rgba(0, 200, 150, 0.35); }
.btn--ghost { border-color: var(--border-strong); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* Hero 右侧数据卡 */
.stats { display: flex; flex-direction: column; gap: 14px; }
.stat {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  padding: 22px 24px; position: relative; overflow: hidden;
}
.stat::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent); opacity: 0.7;
}
.stat__value {
  font-family: var(--mono); font-weight: 700; font-size: clamp(28px, 4vw, 40px);
  color: var(--accent); line-height: 1; letter-spacing: -0.01em;
}
.stat__label { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: 0.06em; margin-top: 8px; }

/* ============ 通用 section ============ */
.section { max-width: var(--maxw); margin: 0 auto; padding: clamp(64px, 9vw, 120px) var(--pad); }
.section__head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 48px; border-bottom: 1px solid var(--border); padding-bottom: 20px; }
.section__index { font-family: var(--mono); font-size: 14px; color: var(--accent); }
.section__title { font-family: var(--serif); font-weight: 400; font-size: clamp(30px, 4.5vw, 46px); }
.section__sub { font-family: var(--mono); font-size: 12px; color: var(--faint); letter-spacing: 0.18em; margin-left: auto; }

/* ============ 工作经历 时间线 ============ */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(180deg, var(--accent-line), transparent);
}
.exp { position: relative; padding-bottom: 44px; }
.exp:last-child { padding-bottom: 0; }
.exp::before {
  content: ""; position: absolute; left: -28px; top: 6px; width: 16px; height: 16px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 200, 150, 0.12);
}
.exp__period { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: 0.05em; }
.exp__company { font-family: var(--serif); font-size: clamp(22px, 3vw, 30px); margin: 4px 0 2px; }
.exp__role { font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.exp__desc { color: #c9c9cf; max-width: 70ch; margin-bottom: 14px; }
.exp__results { list-style: none; display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.exp__results li { position: relative; padding-left: 20px; color: #b9b9c0; font-size: 14.5px; }
.exp__results li::before { content: "▹"; position: absolute; left: 0; color: var(--accent); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.03em;
  padding: 5px 11px; border-radius: 999px; border: 1px solid var(--border-strong);
  color: var(--muted); background: var(--surface);
}

/* ============ 重点项目 ============ */
.projects { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.project {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  padding: 28px; transition: transform 0.25s, border-color 0.25s;
  display: flex; flex-direction: column;
}
.project:hover { transform: translateY(-4px); border-color: var(--accent-line); }
.project__no { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: 0.1em; }
.project__name { font-family: var(--serif); font-size: clamp(20px, 2.6vw, 26px); margin: 6px 0 8px; }
.project__meta { font-family: var(--mono); font-size: 11px; letter-spacing: 0.03em; color: var(--accent); margin-bottom: 14px; }
.project__desc { color: var(--muted); font-size: 14.5px; margin-bottom: 14px; }
.project__points { list-style: none; margin: 0 0 20px; padding: 0; display: grid; gap: 10px; }
.project__points li { position: relative; padding-left: 18px; font-size: 13.5px; line-height: 1.55; color: var(--fg); }
.project__points li::before { content: ""; position: absolute; left: 0; top: 9px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); opacity: 0.85; }
.project__metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 18px; }
.pmetric { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; background: var(--bg); }
.pmetric__v { font-family: var(--mono); font-weight: 700; font-size: 20px; color: var(--accent); line-height: 1; }
.pmetric__l { font-family: var(--mono); font-size: 10.5px; color: var(--faint); letter-spacing: 0.04em; margin-top: 6px; }
/* 让项目卡内最后的技术标签落到底部，配合网格等高，消除中部空白 */
.project .tags { margin-top: auto; }

/* ============ 技术栈 ============ */
.tech { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tech__cat {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); padding: 22px;
}
.tech__cat h3 { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: 0.08em; margin-bottom: 14px; text-transform: uppercase; }
.tech__cat .tags { gap: 7px; }
.tech__cat .tag { font-size: 12px; }

/* ============ 教育经历 ============ */
.education { display: grid; gap: 18px; }
.edu {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  padding: 24px 28px;
}
.edu__period { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: 0.05em; margin-bottom: 6px; }
.edu__school { font-family: var(--serif); font-size: clamp(22px, 3vw, 30px); margin-bottom: 4px; }
.edu__meta { color: var(--muted); font-size: 14.5px; }

/* ============ 联系 ============ */
.contact {
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  background: linear-gradient(135deg, var(--surface-2), var(--surface));
  padding: clamp(28px, 5vw, 48px);
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px 32px;
}
.contact__item { display: flex; align-items: center; gap: 16px; }
.contact__icon {
  width: 44px; height: 44px; flex: none; border-radius: 12px;
  border: 1px solid var(--border-strong); background: var(--bg);
  display: grid; place-items: center; color: var(--accent);
}
.contact__icon svg { width: 20px; height: 20px; }
.contact__label { font-family: var(--mono); font-size: 11px; color: var(--faint); letter-spacing: 0.1em; }
.contact__value { font-size: 16px; color: var(--text); word-break: break-all; }
.contact__value a:hover { color: var(--accent); }

/* ============ 页脚 ============ */
.footer {
  max-width: var(--maxw); margin: 0 auto; padding: 40px var(--pad) 60px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  border-top: 1px solid var(--border); font-family: var(--mono); font-size: 12px; color: var(--faint);
}
.footer #footerName { color: var(--text); letter-spacing: 0.04em; }

/* ============ 滚动渐入 ============ */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 880px) {
  .hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .hero { min-height: auto; padding-top: 110px; }
  .projects { grid-template-columns: 1fr; }
  .tech { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: 1fr; }
  .nav__links { gap: 18px; }
  .nav__links a { font-size: 12px; }
}
@media (max-width: 520px) {
  .tech { grid-template-columns: 1fr; }
  .section__sub { display: none; }
  .nav__brand-sub { display: none; }
}

/* 打印样式 */
@media print {
  body { background: #fff; color: #111; }
  .nav, .scroll-progress, .hero__cta { display: none; }
  .stat, .project, .tech__cat, .contact { border-color: #ccc; }
  .reveal { opacity: 1; transform: none; }
}