/* ============================================================
   app.css — 作品集首页
   深色主调，咬合三体/贪吃蛇/小火车的视觉语言。
   零外部依赖：不引 CDN、不引外链字体，离线可跑。
   ============================================================ */

:root {
  /* 底色：比三体的 #04060c 略提亮，留出层次 */
  --bg: #070a12;
  --bg-2: #0b1019;
  --panel: rgba(14, 20, 33, 0.72);
  --panel-solid: #0e1421;
  --brd: rgba(110, 160, 220, 0.16);
  --brd-hi: rgba(120, 180, 255, 0.42);

  --text: #c8d6e8;
  --text-hi: #eef4fb;
  --dim: #6b7f96;
  --dim-2: #4a5b70;

  --accent: #7fb4ff;
  --ok: #3fd8c8;
  --warm: #ffb347;
  --violet: #a98bff;

  --mono: ui-monospace, "Cascadia Mono", Consolas, "Courier New", monospace;
  --sans: -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;

  --radius: 10px;
  --shell-w: 1180px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* 背景：极淡的网格 + 两团辉光，营造"实验室"氛围。纯 CSS，无图片依赖 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(110, 160, 220, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 160, 220, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 30%, transparent 78%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(720px 420px at 12% -6%, rgba(127, 180, 255, 0.13), transparent 62%),
    radial-gradient(640px 400px at 88% 4%, rgba(169, 139, 255, 0.10), transparent 60%),
    radial-gradient(900px 520px at 50% 108%, rgba(63, 216, 200, 0.07), transparent 66%);
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }

/* ============================================================
   顶栏
   ============================================================ */
.site-head {
  position: relative;
  z-index: 2;
  max-width: var(--shell-w);
  margin: 0 auto;
  padding: 56px 32px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--dim);
}

.brand .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 10px var(--ok);
  animation: pulse 2.6s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.45; transform: scale(0.82); }
}

.head-main {
  margin-top: 22px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

h1.title {
  margin: 0;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.16;
  font-weight: 650;
  letter-spacing: -0.022em;
  color: var(--text-hi);
}

h1.title em {
  font-style: normal;
  background: linear-gradient(96deg, var(--accent) 8%, var(--violet) 52%, var(--ok) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 14px 0 0;
  max-width: 62ch;
  color: var(--dim);
  font-size: 13.5px;
}

/* 统计条 */
.stats {
  display: flex;
  gap: 0;
  font-family: var(--mono);
  border: 1px solid var(--brd);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  overflow: hidden;
}

.stats .cell {
  padding: 12px 20px;
  border-right: 1px solid var(--brd);
  text-align: center;
  min-width: 88px;
}
.stats .cell:last-child { border-right: 0; }
.stats .num {
  display: block;
  font-size: 20px;
  font-weight: 600;
  color: var(--text-hi);
  letter-spacing: -0.01em;
}
.stats .lab {
  display: block;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--dim-2);
  text-transform: uppercase;
  margin-top: 2px;
}

/* ============================================================
   工具行：筛选 + 搜索
   ============================================================ */
.toolbar {
  position: relative;
  z-index: 2;
  max-width: var(--shell-w);
  margin: 40px auto 0;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.filters { display: flex; gap: 7px; flex-wrap: wrap; }

.chip {
  font-family: var(--mono);
  font-size: 11.5px;
  padding: 6px 13px;
  border: 1px solid var(--brd);
  border-radius: 999px;
  background: transparent;
  color: var(--dim);
  transition: all 0.16s ease;
  letter-spacing: 0.02em;
}
.chip:hover { border-color: var(--brd-hi); color: var(--text); }
.chip[aria-pressed="true"] {
  background: rgba(127, 180, 255, 0.13);
  border-color: var(--brd-hi);
  color: var(--accent);
}

.spacer { flex: 1 1 auto; }

.search-wrap { position: relative; }
.search-wrap .ico {
  position: absolute;
  left: 11px; top: 50%;
  transform: translateY(-50%);
  color: var(--dim-2);
  font-size: 12px;
  pointer-events: none;
}
input#search {
  font-family: var(--mono);
  font-size: 12px;
  width: 216px;
  padding: 7px 12px 7px 30px;
  border: 1px solid var(--brd);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  outline: none;
  transition: border-color 0.16s ease, width 0.2s ease;
}
input#search::placeholder { color: var(--dim-2); }
input#search:focus { border-color: var(--brd-hi); width: 260px; }

/* ============================================================
   卡片网格
   ============================================================ */
.grid {
  position: relative;
  z-index: 2;
  max-width: var(--shell-w);
  margin: 22px auto 0;
  padding: 0 32px 96px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 20px;
}

.card {
  position: relative;
  border: 1px solid var(--brd);
  border-radius: 14px;
  background: var(--panel-solid);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.22s cubic-bezier(0.22, 1, 0.36, 1),
              border-color 0.22s ease,
              box-shadow 0.22s ease;
  animation: rise 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--card-accent, var(--brd-hi));
  box-shadow:
    0 18px 44px -14px rgba(0, 0, 0, 0.72),
    0 0 0 1px var(--card-accent, transparent) inset;
}

/* 封面：等比 16:10，用渐变 + 网格模拟"实机画面"的质感 */
.cover {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--cover-bg, #0a0f18);
  cursor: pointer;
  border-bottom: 1px solid var(--brd);
}

.cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: 0.5;
}

.cover-glow {
  position: absolute;
  inset: -30%;
  background: radial-gradient(circle at 50% 48%,
              var(--cover-glow, rgba(127, 180, 255, 0.5)) 0%,
              transparent 58%);
  filter: blur(6px);
}

.cover-art {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 58px;
  line-height: 1;
  filter: drop-shadow(0 6px 22px rgba(0, 0, 0, 0.55));
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.card:hover .cover-art { transform: scale(1.07) rotate(-2.5deg); }

/* 封面角标 */
.cover-tags {
  position: absolute;
  left: 12px; bottom: 12px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: 5px;
  background: rgba(4, 8, 16, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.11);
  color: #cfdcec;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* 悬停浮现的"进入"按钮 */
.cover-enter {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: #040810;
  background: linear-gradient(0deg, rgba(4, 8, 16, 0.55), rgba(4, 8, 16, 0.3));
  opacity: 0;
  transition: opacity 0.2s ease;
}
.card:hover .cover-enter { opacity: 1; }
.cover-enter span.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 17px;
  border-radius: 999px;
  background: var(--card-accent, var(--accent));
  color: #040810;
  font-weight: 600;
  box-shadow: 0 8px 26px -8px var(--card-accent, var(--accent));
}

/* 卡片正文 */
.body {
  padding: 17px 19px 19px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.card h2 {
  margin: 0;
  font-size: 17px;
  font-weight: 620;
  letter-spacing: -0.012em;
  color: var(--text-hi);
}

.year {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--dim-2);
  flex: 0 0 auto;
}

.sub {
  margin: 3px 0 0;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  color: var(--dim-2);
}

.desc {
  margin: 11px 0 0;
  font-size: 13px;
  color: var(--dim);
  flex: 1;
}

/* 高亮特性列表 */
.feats {
  margin: 13px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.feats li {
  position: relative;
  padding-left: 15px;
  font-size: 12px;
  color: var(--dim);
  line-height: 1.5;
}
.feats li::before {
  content: "";
  position: absolute;
  left: 2px; top: 8px;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--card-accent, var(--accent));
  opacity: 0.85;
}
.feats li b { color: var(--text); font-weight: 600; }

/* 技术标签 */
.tech {
  margin-top: 15px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.tech span {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  padding: 3.5px 8px;
  border-radius: 5px;
  background: rgba(127, 180, 255, 0.07);
  border: 1px solid rgba(127, 180, 255, 0.15);
  color: #93b4d8;
}

/* 底部按钮排 */
.actions {
  margin-top: 17px;
  padding-top: 15px;
  border-top: 1px solid rgba(110, 160, 220, 0.1);
  display: flex;
  gap: 9px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  padding: 7px 14px;
  border-radius: 7px;
  border: 1px solid var(--brd);
  background: transparent;
  color: var(--text);
  transition: all 0.16s ease;
  white-space: nowrap;
}
.btn:hover { border-color: var(--brd-hi); background: rgba(127, 180, 255, 0.08); }

.btn.primary {
  background: var(--card-accent, var(--accent));
  border-color: var(--card-accent, var(--accent));
  color: #04080f;
  font-weight: 600;
}
.btn.primary:hover {
  filter: brightness(1.1);
  background: var(--card-accent, var(--accent));
}

.btn.ghost { margin-left: auto; color: var(--dim); }
.btn.ghost:hover { color: var(--text); }

/* 行数读数 */
.metric {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--dim-2);
}

/* 空状态 */
.empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 70px 20px;
  color: var(--dim-2);
  font-family: var(--mono);
  font-size: 13px;
}

/* ============================================================
   全屏播放层（iframe）
   ============================================================ */
.player {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: #04060c;
  display: none;
  flex-direction: column;
}
.player.open { display: flex; }

.player-bar {
  flex: 0 0 auto;
  height: 50px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: #080c14;
  border-bottom: 1px solid var(--brd);
  font-family: var(--mono);
}

.back {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  padding: 6px 13px;
  border: 1px solid var(--brd);
  border-radius: 7px;
  background: transparent;
  color: var(--text);
  transition: all 0.16s ease;
}
.back:hover { border-color: var(--brd-hi); background: rgba(127, 180, 255, 0.1); }

.player-title {
  font-size: 13px;
  color: var(--text-hi);
  font-weight: 600;
}
.player-sub {
  font-size: 10.5px;
  color: var(--dim-2);
  letter-spacing: 0.04em;
}

.player-bar .right { margin-left: auto; display: flex; gap: 9px; }

.player-frame {
  flex: 1 1 auto;
  width: 100%;
  border: 0;
  background: #04060c;
}

/* 播放层的加载提示 */
.player-hint {
  position: absolute;
  inset: 50px 0 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  color: var(--dim-2);
  font-family: var(--mono);
  font-size: 12px;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.player.loading .player-hint { opacity: 1; }

/* ============================================================
   页脚
   ============================================================ */
.site-foot {
  position: relative;
  z-index: 2;
  max-width: var(--shell-w);
  margin: 0 auto;
  padding: 0 32px 56px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--dim-2);
  border-top: 1px solid rgba(110, 160, 220, 0.1);
  padding-top: 22px;
}
.site-foot .grow { flex: 1 1 auto; }
.site-foot a:hover { color: var(--accent); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 720px) {
  .site-head { padding: 38px 20px 0; }
  .head-main { flex-direction: column; align-items: flex-start; gap: 22px; }
  .stats { width: 100%; }
  .stats .cell { flex: 1; padding: 10px 8px; min-width: 0; }
  .toolbar, .grid, .site-foot { padding-left: 20px; padding-right: 20px; }
  .grid { grid-template-columns: 1fr; gap: 16px; }
  input#search { width: 150px; }
  input#search:focus { width: 180px; }
  .player-title, .player-sub { display: none; }
}

/* 键盘可达性 */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

/* 尊重"减少动效"偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}