/* ===========================================================
   10hxa.com — 起步样式
   想改配色，只改下面 :root 里的变量即可，全站跟着变。
   =========================================================== */

:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --fg: #101828;
  --fg-soft: #667085;
  --line: #e4e7ec;
  --card: #ffffff;
  --brand: #2f6bff;
  --brand-2: #7a5cff;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 10px 28px rgba(16, 24, 40, .07);
  --radius: 16px;
  --max: 1080px;
}

[data-theme="dark"] {
  --bg: #0b0d12;
  --bg-soft: #12151c;
  --fg: #e8eaf0;
  --fg-soft: #99a1b3;
  --line: #242938;
  --card: #141822;
  --brand: #6b93ff;
  --brand-2: #a78bfa;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
               "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background .25s ease, color .25s ease;
}

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

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 720px; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -.01em; }
.brand-mark {
  display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; font-size: 14px; font-weight: 800;
}
.brand-text i { color: var(--fg-soft); font-style: normal; font-weight: 500; }
.nav-links { display: flex; align-items: center; gap: 26px; font-size: 15px; color: var(--fg-soft); }
.nav-links a:hover { color: var(--fg); }

.theme-toggle {
  display: grid; place-items: center; width: 34px; height: 34px; cursor: pointer;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--card); color: var(--fg); font-size: 14px; line-height: 1;
}
.theme-toggle .moon { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .moon { display: block; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 72px;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: -30% 0 auto 0; height: 620px; z-index: -1;
  background:
    radial-gradient(46% 52% at 22% 34%, color-mix(in srgb, var(--brand) 22%, transparent), transparent 70%),
    radial-gradient(40% 48% at 78% 22%, color-mix(in srgb, var(--brand-2) 20%, transparent), transparent 70%);
  filter: blur(6px);
}
.eyebrow {
  display: inline-block; margin: 0 0 18px;
  padding: 5px 13px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--card); color: var(--fg-soft); font-size: 13px;
}
h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.12; letter-spacing: -.03em; font-weight: 800;
}
.grad {
  background: linear-gradient(100deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { max-width: 640px; margin: 0 0 32px; color: var(--fg-soft); font-size: 18px; }
.lede strong { color: var(--fg); font-weight: 600; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 44px; }
.btn {
  display: inline-flex; align-items: center; height: 46px; padding: 0 22px;
  border-radius: 11px; font-size: 15px; font-weight: 600;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; box-shadow: 0 8px 22px color-mix(in srgb, var(--brand) 34%, transparent);
}
.btn-primary:hover { box-shadow: 0 12px 28px color-mix(in srgb, var(--brand) 44%, transparent); }
.btn-ghost { border: 1px solid var(--line); background: var(--card); }
.btn-ghost:hover { border-color: var(--fg-soft); }

.facts {
  display: flex; flex-wrap: wrap; gap: 10px 34px;
  margin: 0; padding: 0; list-style: none; font-size: 14px;
}
.facts li { display: flex; align-items: baseline; gap: 9px; }
.facts span { color: var(--fg-soft); }
.facts b { font-weight: 600; }

/* ---------- 区块 ---------- */
.section { padding: 76px 0; }
.section-soft { background: var(--bg-soft); border-block: 1px solid var(--line); }
.section-title { margin: 0 0 10px; font-size: clamp(24px, 3.4vw, 32px); letter-spacing: -.02em; font-weight: 700; }
.section-sub { margin: 0 0 36px; color: var(--fg-soft); }

.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  display: block;
  padding: 26px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); box-shadow: var(--shadow);
  transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--brand) 42%, var(--line)); }
.card h3 { margin: 0 0 8px; font-size: 18px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--fg-soft); font-size: 15px; }
.icon {
  display: grid; place-items: center; width: 36px; height: 36px; margin-bottom: 16px;
  border-radius: 10px; background: color-mix(in srgb, var(--brand) 12%, transparent);
  color: var(--brand); font-size: 13px; font-weight: 800;
}
.card-link .more { display: inline-block; margin-top: 14px; color: var(--brand); font-size: 14px; font-weight: 600; }
.thumb { height: 132px; margin: -6px -6px 18px; border-radius: 12px; }
.t1 { background: linear-gradient(135deg, #2f6bff, #7a5cff); }
.t2 { background: linear-gradient(135deg, #12b981, #0ea5e9); }
.t3 { background: linear-gradient(135deg, #f59e0b, #ef4444); }

/* 战棋网格封面：叠一层棋盘格，呼应项目主题 */
.t-chess {
  background-color: #1b2436;
  background-image:
    linear-gradient(rgba(140, 175, 255, .22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 175, 255, .22) 1px, transparent 1px),
    linear-gradient(135deg, #2f6bff, #7a5cff);
  background-size: 22px 22px, 22px 22px, 100% 100%;
  background-blend-mode: overlay, overlay, normal;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.card-tags span {
  padding: 2px 9px; border: 1px solid var(--line); border-radius: 999px;
  color: var(--fg-soft); font-size: 11.5px;
}

/* ---------- 联系 ---------- */
.contact-box {
  padding: 32px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); box-shadow: var(--shadow); text-align: center;
}
.mail { margin: 0 0 10px; font-size: clamp(20px, 3.6vw, 28px); font-weight: 700; letter-spacing: -.01em; }
.tip { margin: 0; color: var(--fg-soft); font-size: 14px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); padding: 32px 0; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 8px 20px;
  align-items: center; justify-content: space-between;
  color: var(--fg-soft); font-size: 14px;
}
.footer p { margin: 0; }
.icp a:hover { color: var(--fg); text-decoration: underline; }

/* ---------- 移动端 ---------- */
@media (max-width: 640px) {
  .nav-links { gap: 16px; font-size: 14px; }
  .nav-links a { display: none; }
  .hero { padding: 64px 0 48px; }
  .section { padding: 56px 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}