/* ============================================================
   hub.css — 白底 + 一点中性灰渐变，通篇黑白
   ============================================================ */

:root {
  --bg:       #ffffff;
  --hero-1:   #ececec;   /* 抬头顶缘最深处，往下淡出到白（y≈500 处全白） */
  --hero-mid: #f7f7f7;
  --line:     #e6e6e6;
  --line-2:   #d8d8d8;   /* 抬头底缘那条稍重的分隔线 */
  --ink:      #141414;   /* 正文 */
  --ink-2:    #3a3a3a;   /* 次级正文 */
  --ink-3:    #5f5f5f;   /* 弱化文字（6.39:1 on white） */
  --ink-4:    #737373;   /* 最弱一档（4.74:1，刚好过 AA） */
  --chip:     #f4f4f4;   /* 浅色标签底 */
  --line-hi:  #c8c8c8;   /* hover 时的边框 */
  --r: 14px;
  --font: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", "PingFang SC",
          "Microsoft YaHei", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  /* 纯竖向渐变：横向每一行同色（深色版那个 radial 辉光在浅底上会露出圆斑，去掉） */
  background: linear-gradient(180deg, var(--hero-1) 0px, var(--hero-mid) 300px, var(--bg) 500px);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

b  { font-weight: 700; }
a { color: inherit; }

/* ───────────── 抬头 ───────────── */

.hero {
  border-bottom: 1px solid var(--line-2);
  background: repeating-linear-gradient(90deg, transparent 0 78px, rgba(0,0,0,.028) 78px 79px);
  padding: 56px 24px 40px;
}

.hero-inner { max-width: 1080px; margin: 0 auto; }

.kicker {
  font-size: 12px; letter-spacing: .42em; color: var(--ink-3);
  margin: 0 0 14px; font-weight: 700;
}

.hero-title {
  font-size: clamp(34px, 7vw, 66px);
  line-height: 1.1; margin: 0; letter-spacing: .04em;
  color: var(--ink);
}
.hero-title::after {
  content: ""; display: block; width: 64px; height: 3px; margin-top: 18px;
  background: var(--ink);
}

/* ───────────── 区块 ───────────── */

main { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

.sec { padding: 52px 0 8px; }

.sec-head { margin-bottom: 22px; }
.sec-head h2 {
  font-size: clamp(20px, 3.4vw, 26px); margin: 0; letter-spacing: .08em;
}
.sec-head h2::before {
  content: ""; display: inline-block; width: 5px; height: .92em;
  margin-right: 12px; vertical-align: -2px;
  background: var(--ink); border-radius: 2px;
}

/* ───────────── 卡片 ───────────── */

.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); }

.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--line); border-radius: var(--r);
  padding: 18px 18px 16px; overflow: hidden;
  box-shadow: 0 1px 2px rgba(0,0,0,.05);
  transition: border-color .18s, box-shadow .18s, transform .18s;
}
.card:hover {
  border-color: var(--line-hi); transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,.10);
}

.card-top { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 12px; }

.rank {
  flex: none; width: 40px; text-align: center;
  font-size: 22px; font-weight: 800; line-height: 1.3;
  color: var(--ink); font-variant-numeric: tabular-nums;
}
.rank small { display: block; font-size: 9px; letter-spacing: .14em; color: var(--ink-3); font-weight: 600; }

/* 厂家图标白底：astra / grok / k3 三个是黑字透明底，黑底上会消失 */
.logo {
  flex: none; width: 46px; height: 46px; border-radius: 10px;
  background: #fff; border: 1px solid var(--line); object-fit: contain;
}

.who { min-width: 0; flex: 1; }
.who .mname {
  font-size: 15px; font-weight: 700; letter-spacing: .01em; color: var(--ink);
}
.who .vendor { font-size: 11px; color: var(--ink-3); letter-spacing: .04em; }
.who .gtitle {
  margin-top: 5px; font-size: 13px; color: var(--ink-2);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

.meta { display: flex; flex-wrap: wrap; gap: 6px; margin: auto 0 14px; }
.tag {
  font-size: 11px; padding: 3px 8px; border-radius: 5px;
  background: var(--ink); border: 1px solid var(--ink); color: #fff;
}
.tag.k { color: var(--ink); border-color: var(--line); background: var(--chip); }
.tag.master { color: var(--ink); border-color: var(--ink); background: #fff; font-weight: 700; }

.acts { display: flex; gap: 8px; margin-top: auto; }
.btn {
  flex: 1; text-align: center; text-decoration: none; cursor: pointer;
  font-family: inherit; font-size: 13.5px; font-weight: 700; letter-spacing: .04em;
  padding: 10px 12px; border-radius: 8px; border: 1px solid transparent;
  transition: background .15s, border-color .15s, color .15s;
}
.btn.primary { background: var(--ink); color: #fff; }
.btn.primary:hover { background: #000; }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--ink); flex: 0 0 auto; padding-inline: 14px; }
.btn.ghost:hover { border-color: var(--line-hi); background: #f7f7f7; }

/* ───────────── 页脚 ───────────── */

.foot {
  max-width: 1080px; margin: 56px auto 0; padding: 26px 24px 60px;
  border-top: 1px solid var(--line);
}
.disclaim { margin: 0; font-size: 12.5px; line-height: 1.95; color: var(--ink-3); }
.disclaim b { color: var(--ink); }

/* ───────────── 试玩层 ───────────── */

.play {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; flex-direction: column; background: var(--bg);
}
.play[hidden] { display: none; }

.play-bar {
  flex: none; display: flex; align-items: center; gap: 12px;
  padding: 9px 14px; background: #fafafa; border-bottom: 1px solid var(--line);
}
.play-id { min-width: 0; display: flex; align-items: baseline; gap: 10px; flex: 1; }
.play-id b { font-size: 14px; white-space: nowrap; color: var(--ink); }
.play-id span {
  font-size: 12px; color: var(--ink-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.play-acts { display: flex; align-items: center; gap: 12px; }
.play-ctrl {
  font-size: 11.5px; color: var(--ink-3); max-width: 34ch;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.pbtn {
  flex: none; cursor: pointer; text-decoration: none;
  font-family: inherit; font-size: 12.5px; font-weight: 700;
  padding: 7px 12px; border-radius: 7px;
  background: transparent; border: 1px solid var(--line); color: var(--ink);
}
.pbtn:hover { background: #f2f2f2; border-color: var(--line-hi); }

.play-frame { position: relative; flex: 1; min-height: 0; }
.play-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: #000; }

.play-load {
  position: absolute; inset: 0; z-index: 2;
  display: flex; align-items: center; justify-content: center; gap: 12px;
  background: #fafafa; color: var(--ink-3); font-size: 13px;
}
.play-load[hidden] { display: none; }
.spin {
  width: 15px; height: 15px; border-radius: 50%;
  border: 2px solid var(--line); border-top-color: var(--ink);
  animation: sp .8s linear infinite;
}
@keyframes sp { to { transform: rotate(360deg); } }

/* ───────────── 窄屏 ───────────── */

@media (max-width: 620px) {
  body { font-size: 15px; }
  .hero { padding: 36px 18px 28px; }
  main, .foot { padding-inline: 18px; }
  .cards { grid-template-columns: 1fr; }
  .card { padding: 16px 14px; }
  .rank { width: 32px; font-size: 19px; }
  .logo { width: 40px; height: 40px; }
  .play-bar { flex-wrap: wrap; gap: 8px; padding: 8px 10px; }
  .play-id { order: 3; flex-basis: 100%; }
  .play-ctrl { display: none; }
}