/* ============================================================
   NIGHT CHROMA — GUOZHAN Portfolio
   深炭底 + 琥珀橙/青蓝双信号色，极少文字、精确网格
   ============================================================ */

:root {
  --bg: #0D1117;
  --bg-raise: #161B22;
  --line: #21262D;
  --ink: #E6EDF3;
  --dim: #8B949E;
  --amber: #FF8C42;
  --cyan: #3FA7D6;
  --grid-cell: 44px;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* 全局细网格纹理（哑光漆与颗粒屏幕的混合记忆） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.026) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.026) 1px, transparent 1px);
  background-size: var(--grid-cell) var(--grid-cell);
}

/* ---------------- 导航 ---------------- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px clamp(20px, 4vw, 56px);
  background: linear-gradient(180deg, rgba(13, 17, 23, 0.92), rgba(13, 17, 23, 0));
}

.logo {
  font-weight: 800;
  letter-spacing: .22em;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
}
.logo-dot { color: var(--amber); }

.site-nav nav {
  display: flex;
  gap: clamp(16px, 3vw, 40px);
}
.site-nav nav a {
  color: var(--dim);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  transition: color .25s;
  position: relative;
}
.site-nav nav a:hover,
.site-nav nav a.active { color: var(--ink); }
.site-nav nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 1px;
  background: var(--amber);
  transition: width .25s;
}
.site-nav nav a:hover::after { width: 100%; }

/* ---------------- 首页 Hero（Canvas 点阵标题） ---------------- */
.hero {
  position: relative;
  min-height: 78vh;
  overflow: hidden;
  padding: 0;
}
#guozhan-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
.hero-caption {
  position: absolute;
  top: 0; left: clamp(20px, 6vw, 80px);
  z-index: 2;
  pointer-events: none;
}
.hero-kicker {
  padding-top: 108px;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .34em;
}
.hero-title {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.hero-sub {
  position: absolute;
  top: 63%;
  left: clamp(22px, 6.4vw, 84px);
  color: var(--cyan);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .52em;
  text-transform: lowercase;
}

/* ---------------- 首页三入口卡 ---------------- */
.entrance {
  position: relative;
  z-index: 2;
  padding: 9vh clamp(20px, 6vw, 80px) 12vh;
}
.entrance-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}
.grid-label {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .3em;
}
.entrance-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.entry-card {
  --card-accent: var(--ink);
  position: relative;
  display: block;
  padding: 30px 28px 30px;
  text-decoration: none;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.022), rgba(255, 255, 255, 0.005));
  transition: transform .35s, border-color .35s, box-shadow .35s;
  overflow: hidden;
}
.entry-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.018) 0 1px, transparent 1px 8px);
  pointer-events: none;
}
.entry-card:hover {
  transform: translateY(-6px);
  border-color: var(--card-accent);
  box-shadow: 0 18px 44px -24px var(--card-accent);
}
.entry-card .tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .24em;
  padding: 4px 10px;
  border: 1px solid var(--card-accent);
  color: var(--card-accent);
}
.entry-card .icon {
  margin: 28px 0 20px;
  color: var(--card-accent);
}
.entry-card .num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
  letter-spacing: .18em;
}
.entry-card h3 {
  margin: 8px 0 4px;
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--ink);
}
.entry-card .count {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--card-accent);
}
.entry-card .arrow {
  position: absolute;
  right: 24px;
  bottom: 30px;
  color: var(--card-accent);
  opacity: .85;
  transition: transform .3s;
}
.entry-card:hover .arrow { transform: translateX(5px); }

/* ---------------- 列表页 ---------------- */
.page {
  position: relative;
  z-index: 2;
  max-width: 1420px;
  margin: 0 auto;
  padding: 148px clamp(20px, 6vw, 80px) 10vh;
}
.page-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1px solid var(--line);
  padding-bottom: 24px;
  margin-bottom: 46px;
}
.page-head h1 {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  letter-spacing: .08em;
}
.page-head-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}
#item-count { color: var(--amber); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.card {
  border: 1px solid var(--line);
  background: var(--bg-raise);
  transition: transform .3s, border-color .3s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--amber);
}
.card-video:hover { border-color: var(--cyan); }
.card .media {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #0A0D12;
}
.card-video .media { aspect-ratio: 16 / 9; }
.card img,
.card video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .6s;
}
.card:hover img,
.card:hover video { transform: scale(1.03); }
.card .meta {
  padding: 18px 20px 20px;
}
.card .row {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--dim);
}
.card .cat { color: var(--amber); }
.card-video .cat { color: var(--cyan); }
.card h3 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .05em;
  margin: 10px 0 6px;
}
.card p {
  font-size: 12.5px;
  color: var(--dim);
  line-height: 1.65;
  margin-bottom: 14px;
}
.empty {
  grid-column: 1 / -1;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  padding: 40px 0;
}

/* ---------------- 关于页 ---------------- */
.about { max-width: 900px; }
.bio {
  color: var(--dim);
  font-size: clamp(16px, 2.1vw, 23px);
  line-height: 1.85;
  max-width: 720px;
}
.bio em { color: var(--ink); font-style: normal; }
.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}
.stack span {
  border: 1px solid var(--line);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  padding: 9px 16px;
}
.contact {
  margin-top: 56px;
  border-top: 1px solid var(--line);
  padding-top: 30px;
}
.contact h2 {
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--dim);
  font-weight: 600;
  margin-bottom: 18px;
}
.contact-line {
  font-size: 15px;
  letter-spacing: .06em;
}
.contact-line a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 140, 66, .35);
  padding-bottom: 2px;
}

/* ---------------- 页脚 ---------------- */
footer {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding: 26px clamp(20px, 6vw, 80px);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .24em;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .entrance-cards { grid-template-columns: 1fr; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .hero-sub { top: 62%; }
}

@media (max-width: 560px) {
  .site-nav {
    flex-direction: column;
    gap: 12px;
    padding: 16px 20px;
  }
  .site-nav nav { gap: 20px; }
  .page { padding-top: 160px; }
  .grid { grid-template-columns: 1fr; }
  .page-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .page-head-side { align-items: flex-start; }
  .hero-kicker { padding-top: 130px; }
  .hero-sub { top: 70%; }
  footer { flex-direction: column; gap: 8px; }
}