/* ============================================================
   RevolutionLA · 深空实验室 SIGMA
   近黑精密仪器质感 · 网格 · 信号绿单点爆发 · 冷白文字
   ============================================================ */

:root {
  /* 空间色板 */
  --space-0: #07090d;      /* 页面底 */
  --space-1: #0c121a;      /* 区块底 */
  --space-2: #111a24;      /* 卡片底 */
  --space-3: #16202d;      /* 悬浮/高亮描边 */
  --ink: #dfe6ee;          /* 主文字 · 冷白 */
  --ink-dim: #8b96a6;      /* 次级文字 */
  --ink-faint: #5d6878;    /* 弱文字/坐标 */
  --signal: #34f0a0;       /* 信号绿 · 唯一亮色 */
  --signal-dim: rgba(52, 240, 160, 0.18);
  --amber: #f2b24c;        /* 次级暖点缀(克制) */
  --grid: rgba(148, 168, 190, 0.07);
  --stroke: rgba(148, 168, 190, 0.16);
  --stroke-bright: rgba(148, 168, 190, 0.32);

  /* 字体 */
  --display: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  --body-zh: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  --max: 1160px;
  --section-pad: 132px;
  --radius: 14px;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--body-zh);
  background: var(--space-0);
  color: var(--ink);
  line-height: 1.75;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 锚点目标避免被粘性导航遮挡 */
section[id] { scroll-margin-top: 86px; }

.mono { font-family: var(--mono); }
em { font-style: normal; font-weight: 600; color: var(--amber); }
strong { font-weight: 600; color: var(--ink); }
::selection { background: var(--signal); color: #04120c; }
a { color: inherit; text-decoration: none; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 28px; position: relative; }

/* ==================== 背景系统 ==================== */
#starfield {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 0%, transparent 100%);
}

/* ==================== 导航 ==================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(7, 9, 13, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--stroke);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
  gap: 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-weight: 600; font-size: 15px; color: var(--ink); }
.brand-glyph { color: var(--signal); font-weight: 700; }
.brand-name { letter-spacing: 0.04em; }
.nav-links { display: flex; gap: 30px; list-style: none; margin: 0; }
.nav-links a { font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; color: var(--ink-dim); transition: color .2s; }
.nav-links a:hover { color: var(--signal); }
.nav-cta { font-size: 12px; letter-spacing: 0.12em; color: var(--ink); border: 1px solid var(--stroke-bright); padding: 8px 16px; border-radius: 8px; transition: border-color .2s, color .2s, box-shadow .2s; }
.nav-cta:hover { border-color: var(--signal); color: var(--signal); box-shadow: 0 0 20px var(--signal-dim); }
.nav-links { padding: 0; }

/* ==================== Hero ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 60px 0;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 8%;
  transform: translateX(-50%);
  width: 900px;
  height: 640px;
  background: radial-gradient(ellipse at center, rgba(34, 240, 160, 0.10), transparent 62%);
  z-index: -1;
  pointer-events: none;
}
.hero-inner { display: flex; flex-direction: column; }
.hero-coord {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  margin-bottom: 42px;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal);
  margin-bottom: 26px;
}
.sig-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px var(--signal-dim), 0 0 16px var(--signal);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}
.hero-title {
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 26px;
  font-size: clamp(46px, 9vw, 118px);
  display: flex;
  flex-wrap: wrap;
  gap: 0.18em;
  align-items: baseline;
  text-wrap: balance;
}
.t-lat { color: var(--ink); }
.t-slash { color: var(--ink-faint); font-weight: 300; }
.t-en {
  background: linear-gradient(120deg, var(--signal) 0%, #7dd7ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}
.hero-role { font-size: clamp(18px, 2.6vw, 26px); color: var(--ink); margin-bottom: 8px; }
.hero-sub { font-size: 14px; color: var(--ink-faint); letter-spacing: 0.04em; }

/* 示波器 */
.scope { margin-top: 54px; max-width: 760px; }
.signal-band {
  position: relative;
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(17,26,36,0.6), rgba(7,9,13,0.4));
  height: 120px;
  overflow: hidden;
}
.wave { width: 100%; height: 100%; }
.wave-path {
  fill: none;
  stroke: var(--signal);
  stroke-width: 2;
  stroke-linecap: round;
  opacity: 1;
  filter: drop-shadow(0 0 6px var(--signal));
}
.wave-fill {
  fill: url(#wavegrad);
  opacity: 0.10;
}
.sweep {
  position: absolute;
  top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(90deg, transparent, var(--signal), transparent);
  box-shadow: 0 0 18px var(--signal);
  animation: sweep 4s linear infinite;
}
@keyframes sweep { 0% { left: -3%; opacity: 0; } 8% { opacity: 1; } 92% { opacity: 1; } 100% { left: 103%; opacity: 0; } }
.scope-readout {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
  padding: 0 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
  flex-wrap: wrap;
}
.scope-readout li { list-style: none; display: flex; gap: 8px; align-items: baseline; }
.scope-readout span { color: var(--ink-faint); }

.hero-actions { display: flex; gap: 16px; margin-top: 44px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  padding: 15px 30px;
  border-radius: 12px;
  touch-action: manipulation;
  transition: background-color .25s, border-color .25s, color .25s, box-shadow .25s, transform .25s;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--signal);
  color: #04120c;
  font-weight: 600;
  box-shadow: 0 0 24px var(--signal-dim);
}
.btn-primary:hover { background: #5cf7b6; box-shadow: 0 0 36px rgba(52,240,160,0.4); transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--stroke-bright); color: var(--ink); }
.btn-ghost:hover { border-color: var(--signal); color: var(--signal); box-shadow: 0 0 20px var(--signal-dim); }

.visitor {
  display: flex; align-items: center; gap: 14px;
  margin-top: 42px; font-size: 12px; letter-spacing: 0.1em; color: var(--ink-faint);
}
.visitor { color: var(--ink-dim); }
.visitor-label { color: var(--ink-faint); }
.visitor img { height: 22px; border-radius: 4px; }

/* ==================== sections ==================== */
.section { padding-top: var(--section-pad); padding-bottom: var(--section-pad); position: relative; }
.sec-head { margin-bottom: 60px; }
.sec-tag { display: inline-block; font-size: 12px; letter-spacing: 0.18em; color: var(--signal); margin-bottom: 18px; }
.sec-title {
  font-family: var(--display);
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  text-wrap: balance;
}
.sec-note { margin-top: 18px; color: var(--ink-dim); max-width: 520px; font-size: 16px; }

/* ==================== About ==================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 64px;
  border-top: 1px solid var(--stroke);
  padding-top: 52px;
}
.about-main p { font-size: 18px; color: var(--ink-dim); margin-bottom: 18px; }
.about-main .lede { font-size: clamp(19px, 2.4vw, 24px); color: var(--ink); }
.quote {
  margin-top: 34px;
  padding-left: 20px;
  border-left: 2px solid var(--signal);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--ink);
}
.data-grid { display: flex; flex-direction: column; gap: 26px; margin: 0; padding: 0; }
.data-grid > div { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--stroke); padding-bottom: 12px; font-size: 15px; }
.data-grid dt { font-size: 11px; letter-spacing: 0.16em; color: var(--ink-faint); }
.data-grid dd { text-align: right; color: var(--ink); }

/* ==================== Stack ==================== */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 22px;
}
.stack-card {
  position: relative;
  background: linear-gradient(180deg, var(--space-2), var(--space-1));
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 30px;
  display: flex; flex-direction: column;
  transition: transform .3s, border-color .3s, box-shadow .3s;
  overflow: hidden;
}
.stack-card::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--signal), transparent);
  opacity: 0;
  transition: opacity .3s;
}
.stack-card:hover {
  transform: translateY(-6px);
  border-color: var(--stroke-bright);
  box-shadow: 0 18px 48px rgba(0,0,0,0.5), 0 0 30px var(--signal-dim);
}
.stack-card:hover::before { opacity: 1; }
.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.card-id { font-size: 12px; letter-spacing: 0.12em; color: var(--signal); }
.card-pw { font-size: 11px; color: var(--ink-faint); }
.card-title { font-family: var(--display); font-size: 22px; font-weight: 600; margin-bottom: 10px; }
.stack-card p { font-size: 15px; color: var(--ink-dim); margin-bottom: 24px; flex: 1; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; }
.tags li {
  font-family: var(--mono); font-size: 11px; color: var(--ink-dim);
  border: 1px solid var(--stroke); border-radius: 20px; padding: 4px 12px;
}
.tags li:hover { border-color: var(--signal); color: var(--signal); }

/* ==================== Projects ==================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.project-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, var(--space-2), var(--space-1));
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 36px;
  text-decoration: none;
  transition: transform .3s, border-color .3s, box-shadow .3s;
  overflow: hidden;
}
.project-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 100% 0%, var(--signal-dim), transparent 55%);
  opacity: 0;
  transition: opacity .3s;
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--stroke-bright);
  box-shadow: 0 18px 48px rgba(0,0,0,0.5), 0 0 30px var(--signal-dim);
}
.project-card:hover::after { opacity: 1; }
.project-card > * { position: relative; z-index: 1; }
.pc-status { font-size: 11px; letter-spacing: 0.14em; color: var(--signal); margin-bottom: 20px; }
.pc-name {
  font-family: var(--display);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  color: var(--ink);
}
.pc-desc {
  flex: 1;
  font-size: 15px;
  color: var(--ink-dim);
  margin-bottom: 24px;
  line-height: 1.7;
}
.pc-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--ink-faint);
  transition: color .2s;
}
.project-card:hover .pc-link { color: var(--signal); }

/* ==================== Timeline ==================== */
.timeline { border-left: 1px solid var(--stroke); padding-left: 40px; display: flex; flex-direction: column; gap: 52px; margin: 0; }
.tl-item { position: relative; }
.tl-node {
  position: absolute; left: -46px; top: 6px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--space-0);
  border: 2px solid var(--signal);
  box-shadow: 0 0 14px var(--signal-dim);
}
.tl-meta { font-size: 12px; letter-spacing: 0.14em; color: var(--signal); margin-bottom: 8px; }
.tl-item h4 { font-family: var(--display); font-size: 21px; font-weight: 600; margin-bottom: 8px; }
.tl-item p { color: var(--ink-dim); font-size: 15px; max-width: 620px; }

/* ==================== Signal (情怀) ==================== */
.signal-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.sig-card {
  background: var(--space-1);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color .3s, box-shadow .3s, transform .3s;
}
.sig-card:hover { border-color: var(--signal); box-shadow: 0 0 30px var(--signal-dim); transform: translateY(-3px); }
.sig-icon { display: block; font-size: 26px; color: var(--signal); margin-bottom: 18px; }
.sig-card h3 { font-family: var(--display); font-size: 19px; font-weight: 600; margin-bottom: 12px; }
.sig-card p { color: var(--ink-dim); font-size: 15px; }

/* ==================== Contact ==================== */
.contact-inner {
  border: 1px solid var(--stroke);
  border-radius: 18px;
  padding: 64px;
  background:
    radial-gradient(ellipse at 80% -20%, rgba(52,240,160,0.08), transparent 60%),
    var(--space-1);
  text-align: left;
}
.contact-note { max-width: 520px; color: var(--ink-dim); font-size: 17px; margin: 20px 0 36px; }
.contact-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ==================== Footer ==================== */
.site-footer { border-top: 1px solid var(--stroke); padding: 34px 0 44px; }
.footer-row { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 12px; color: var(--ink-faint); letter-spacing: 0.04em; }

/* ==================== Reveal 动效 ==================== */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.8s cubic-bezier(0.16,1,0.3,1), transform 0.8s cubic-bezier(0.16,1,0.3,1);
}
.reveal.visible { opacity: 1; transform: none; }

/* ==================== 无障碍：焦点可见 ==================== */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  background: var(--signal);
  color: #04120c;
  padding: 12px 20px;
  border-radius: 0 0 10px 0;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

a:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ==================== 响应式 ==================== */
@media (max-width: 760px) {
  .nav-links { display: none; }
  .section { --section-pad: 84px; }
  .about-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero { padding: 40px 0 70px; }
  .contact-inner { padding: 40px 26px; }
  .projects-grid { grid-template-columns: 1fr; }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .wave-path, .sweep, .sig-dot { animation: none; }
  * { scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}