/* 嘿笈 / Heji · 官网共享样式（landing）
   双模式色板按品牌手册 §3.1（Apple 柔亮色系 S50）；字体 Inter/PingFang；栅格 8px / 圆角 12–16px */
:root{
  --bg:#141414;            /* 炭 */
  --surface:#1C1C1E;       /* 面板 */
  --surface-2:#242426;
  --line:#2C2C30;
  --text:#F5F5F7;          /* Apple 白 */
  --mute:#9A9AA4;
  --faint:#6E6E78;
  --accent:#57B6C7;        /* 青（主强调） */
  --accent-2:#4683C1;      /* 蓝 */
  --accent-3:#C19146;      /* 橙 */
  --teal-dark:#3796A7;
  --shadow:0 2px 12px rgba(0,0,0,.4);
  --hero-bg-op:.88;
  --hero-glow-op:.24;
  --nav-bg:rgba(20,20,20,.55);
  --sans:-apple-system,BlinkMacSystemFont,"Inter","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"JetBrains Mono","SF Mono",ui-monospace,monospace;
}
:root[data-theme="light"]{
  --bg:#F6F6F8;            /* 云白 */
  --surface:#FFFFFF;
  --surface-2:#EDEDF1;
  --line:#E2E2E8;
  --text:#1A1A1A;
  --mute:#6E6E78;
  --faint:#9A9AA4;
  --accent:#3E9EB0;        /* 青（浅色加深可读） */
  --accent-2:#3A74B4;
  --accent-3:#A8792A;
  --teal-dark:#2E8A9E;
  --shadow:0 2px 8px rgba(26,26,26,.08);
  --hero-bg-op:.55;
  --hero-glow-op:.10;
  --nav-bg:rgba(246,246,248,.72);
}
@media (prefers-color-scheme: light){
  :root:not([data-theme]){ --bg:#F6F6F8;--surface:#FFFFFF;--surface-2:#EDEDF1;--line:#E2E2E8;
    --text:#1A1A1A;--mute:#6E6E78;--faint:#9A9AA4;--accent:#3E9EB0;--accent-2:#3A74B4;
    --accent-3:#A8792A;--teal-dark:#2E8A9E;--shadow:0 2px 8px rgba(26,26,26,.08);
    --hero-bg-op:.55;--hero-glow-op:.10;--nav-bg:rgba(246,246,248,.72); }
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--text);font-family:var(--sans);
  line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden;
  transition:background .3s,color .3s;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:1160px;margin:0 auto;padding:0 28px}

/* ---------- NAV ---------- */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;backdrop-filter:blur(12px);
  background:var(--nav-bg);border-bottom:1px solid var(--line);transition:background .3s,border-color .3s}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:11px;font-weight:600;font-size:16px;letter-spacing:.5px}
.brand img{width:30px;height:30px;display:block;border-radius:7px}
.brand b{font-weight:700}
.brand span{color:var(--mute);font-weight:400;margin-left:2px}
.nav-links{display:flex;align-items:center;gap:26px;font-size:14px;color:var(--mute)}
.nav-links a{transition:color .2s;position:relative}
.nav-links a:hover{color:var(--text)}
.nav-links a.on{color:var(--text)}
.nav-links a.on::after{content:"";position:absolute;left:0;right:0;bottom:-7px;height:1px;background:var(--accent)}
.theme-toggle{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);
  border-radius:999px;padding:6px 14px;font-size:12.5px;color:var(--mute);
  background:transparent;cursor:pointer;transition:border-color .2s,color .2s;font-family:var(--sans)}
.theme-toggle:hover{border-color:var(--accent);color:var(--text)}
.theme-toggle .ico{font-size:13px;line-height:1}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;
  padding:120px 0 80px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:url(hero-bg.png) center 22%/cover no-repeat;
  opacity:var(--hero-bg-op);filter:saturate(.95) brightness(.95);
  transition:opacity .4s}
.hero-glow{position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(55% 65% at 22% 42%,rgba(87,182,199,var(--hero-glow-op)),transparent 60%),
    radial-gradient(40% 50% at 80% 28%,rgba(70,131,193,.13),transparent 70%),
    linear-gradient(180deg,transparent 0%,var(--bg) 72%,var(--bg) 100%);
  transition:background .4s}
.hero-in{position:relative;display:grid;grid-template-columns:300px 1fr;
  gap:56px;align-items:center;width:100%}
.hero-seal{width:300px;height:300px;display:block;margin-left:-6px;
  filter:drop-shadow(0 14px 50px rgba(87,182,199,.28));animation:fadeUp .9s .05s both}
.hero-words{animation:fadeUp .9s .18s both}
.eyebrow{font-family:var(--mono);font-size:11.5px;letter-spacing:3.4px;text-transform:uppercase;
  color:var(--accent);margin-bottom:26px;opacity:.92}
.wordmark{font-weight:800;font-size:84px;line-height:1.05;letter-spacing:1px;margin-bottom:6px}
.wordmark em{font-style:normal;color:var(--accent)}
.wordmark small{font-weight:600;font-size:42px;color:var(--text);margin-left:16px;
  letter-spacing:1.5px;vertical-align:14px}
.wordmark .slash{color:var(--faint);font-weight:300;margin-right:8px;opacity:.6}
.tag-cn{font-size:28px;font-weight:600;margin-top:18px;letter-spacing:3px}
.tag-en{font-style:italic;font-weight:500;font-size:22px;color:var(--mute);margin-top:8px;letter-spacing:.4px}
.lede{max-width:46ch;color:var(--mute);font-size:15px;margin-top:20px}
.lede b{color:var(--text);font-weight:500}
.value{display:flex;gap:26px;margin-top:20px;flex-wrap:wrap}
.value .v{display:flex;align-items:baseline;gap:8px;font-size:13px;color:var(--faint)}
.value .v b{font-weight:700;font-size:16px;color:var(--text)}
.cta{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 24px;border-radius:12px;
  font-size:14.5px;font-weight:600;letter-spacing:.3px;transition:transform .15s,background .2s,border-color .2s}
.btn.primary{background:var(--accent);color:#10242A;box-shadow:0 6px 22px rgba(87,182,199,.30)}
.btn.primary:hover{background:var(--teal-dark);color:#fff;transform:translateY(-1px)}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text)}
.btn.ghost:hover{border-color:var(--mute);transform:translateY(-1px)}
.btn.disabled{opacity:.45;cursor:not-allowed;pointer-events:none}
.arrow{font-size:16px;line-height:1}

/* ---------- PRODUCTS ---------- */
.products{padding:90px 0 110px;position:relative}
.sec-head{display:flex;align-items:baseline;gap:22px;margin-bottom:44px;flex-wrap:wrap}
.sec-head .idx{font-family:var(--mono);font-size:11.5px;letter-spacing:2.6px;color:var(--accent)}
.sec-head h2{font-size:30px;font-weight:800;letter-spacing:1px}
.sec-head .sub{color:var(--faint);font-size:14px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.pcard{background:var(--surface);border:1px solid var(--line);border-radius:16px;
  padding:26px 22px 22px;display:flex;flex-direction:column;gap:10px;
  transition:transform .2s,border-color .2s;position:relative}
.pcard:hover{transform:translateY(-3px);border-color:var(--accent)}
.pcard .tag{position:absolute;top:16px;right:16px;font-size:10.5px;letter-spacing:1px;
  padding:3px 9px;border-radius:999px;border:1px solid var(--line);color:var(--faint)}
.pcard .tag.hot{color:var(--accent);border-color:var(--accent)}
.pcard .plogo{width:64px;height:64px;border-radius:14px;display:flex;align-items:center;
  justify-content:center;font-weight:800;font-size:24px;color:#fff;margin-bottom:4px;
  box-shadow:0 4px 16px rgba(0,0,0,.25)}
.pcard h3{font-size:17px;font-weight:700;letter-spacing:.3px}
.pcard h3 small{display:block;font-size:12px;color:var(--mute);font-weight:500;margin-top:2px}
.pcard p{font-size:13px;color:var(--mute);line-height:1.6}

/* ---------- 内页（download / about） ---------- */
.page{padding:150px 0 100px;min-height:100vh;position:relative}
.page .wrap{position:relative;z-index:1}
.page-hero{margin-bottom:52px}
.page-hero h1{font-size:40px;font-weight:800;letter-spacing:1px}
.page-hero .sub{color:var(--mute);margin-top:12px;font-size:15px;max-width:56ch}

/* 下载表格 */
.dl-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden}
.dl-row{display:grid;grid-template-columns:2.2fr 1fr 1fr 1fr;align-items:center;
  padding:15px 26px;font-size:14px;gap:12px}
.dl-row + .dl-row{border-top:1px solid var(--line)}
.dl-row.head{font-family:var(--mono);font-size:11px;letter-spacing:2px;color:var(--faint);
  background:var(--surface-2);text-transform:uppercase}
.dl-row .p{display:flex;align-items:center;gap:12px;font-weight:600}
.dl-row .p img{width:32px;height:32px;border-radius:8px;object-fit:cover}
.dl-row .p .dot{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;
  justify-content:center;font-size:13px;font-weight:800;color:#fff}
.st{font-size:11.5px;padding:4px 10px;border-radius:999px;width:fit-content}
.st.soon{color:var(--faint);border:1px solid var(--line)}
.st.ready{color:var(--accent);border:1px solid var(--accent)}
.st.na{color:var(--faint);opacity:.4}

/* about 排版 */
.story{max-width:64ch;font-size:15.5px;color:var(--mute);line-height:2}
.story b{color:var(--text);font-weight:600}
.story p+p{margin-top:18px}
.meaning{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px}
.mcard{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:26px 24px}
.mcard .mchar{font-size:40px;font-weight:800;color:var(--accent);line-height:1.1}
.mcard .mchar small{font-size:15px;color:var(--mute);font-weight:500;margin-left:8px}
.mcard h4{font-size:16px;font-weight:700;margin-top:12px}
.mcard p{font-size:13px;color:var(--mute);margin-top:8px;line-height:1.7}
.sec-gap{margin-top:64px}
.sec-title{font-size:22px;font-weight:800;letter-spacing:.5px;margin-bottom:8px}
.sec-title .idx{font-family:var(--mono);font-size:11px;letter-spacing:2.6px;color:var(--accent);
  display:block;margin-bottom:10px;font-weight:500}
@media (max-width:760px){
  .meaning{grid-template-columns:1fr}
  .dl-row{grid-template-columns:1.6fr 1fr;font-size:13px}
  .dl-row .c-win,.dl-row .c-web{display:none}
  .dl-row.head .c-win,.dl-row.head .c-web{display:none}
}
.foot{border-top:1px solid var(--line);padding:30px 0}
.foot-in{display:flex;align-items:center;justify-content:space-between;gap:20px;
  font-size:13px;color:var(--faint)}
.foot-in .left{display:flex;align-items:center;gap:9px}
.foot-in img{width:22px;height:22px;border-radius:6px}

@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

@media (max-width:960px){
  .hero-in{grid-template-columns:1fr;text-align:center;gap:36px}
  .hero-seal{margin:0 auto}
  .value,.cta{justify-content:center}
  .grid4{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:560px){
  .grid4{grid-template-columns:1fr}
  .wordmark{font-size:60px}
}