/* ============================================================
   CourseDock 官网 · 深色主题（取自背景插画配色）
   ============================================================ */
:root{
  --bg:#191713;
  --bg-2:#12100d;
  --panel:#211e18;
  --panel-2:#27231c;
  --ink:#f2ede3;
  --ink-2:#b8afa0;
  --ink-3:#877e70;
  --line:rgba(242,237,227,.12);
  --line-2:rgba(242,237,227,.22);
  --accent:#c8d24e;
  --accent-ink:#1a1813;
  --amber:#e0b45f;
  --ok:#a9c77d;
  --radius:16px;
  --maxw:1120px;
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);
  line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
::selection{background:var(--accent);color:var(--accent-ink)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3,h4{margin:0;line-height:1.25;letter-spacing:-.02em;font-weight:800;color:var(--ink)}
p{margin:0 0 1em}
.con{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:600;
  font-size:15px;padding:12px 22px;border-radius:10px;cursor:pointer;border:1px solid transparent;
  transition:transform .16s ease,filter .16s ease,border-color .16s ease,color .16s ease}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn-accent{background:var(--accent);color:var(--accent-ink);font-weight:700}
.btn-accent:hover{filter:brightness(1.05);transform:translateY(-1px)}
.btn-line{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn-line:hover{border-color:var(--accent);color:var(--accent)}
.btn-lg{padding:14px 28px;font-size:16px}
.btn-sm{padding:9px 16px;font-size:14px;border-radius:9px}

/* ---------- nav ---------- */
header.nav{position:sticky;top:0;z-index:60;background:rgba(18,16,13,.72);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;
  max-width:var(--maxw);margin:0 auto;padding:0 24px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;letter-spacing:-.01em}
.brand .logo{width:32px;height:32px;border-radius:9px;background:var(--accent);color:var(--accent-ink);
  display:grid;place-items:center;flex:none}
.brand small{color:var(--ink-3);font-weight:600;font-size:12.5px;letter-spacing:.02em}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{color:var(--ink-2);font-size:15px;font-weight:500;position:relative;padding:4px 0;transition:color .15s}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--accent)}
.nav-cta{display:flex;align-items:center;gap:12px}
.menu-btn{display:none;width:40px;height:38px;background:transparent;border:1px solid var(--line-2);
  border-radius:9px;color:var(--ink);cursor:pointer;align-items:center;justify-content:center}
.menu-btn svg{width:20px;height:20px}
@media(max-width:820px){
  .menu-btn{display:inline-flex}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;
    align-items:stretch;gap:0;background:var(--panel);border-bottom:1px solid var(--line);
    padding:6px 24px 14px;box-shadow:0 18px 40px rgba(0,0,0,.5)}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 0;border-bottom:1px solid var(--line);font-size:15.5px}
  .nav-links a:last-child{border-bottom:none}
}

/* ---------- hero (with bg image) ---------- */
.hero{position:relative;overflow:hidden;background:#12100d;border-bottom:1px solid var(--line)}
.hero-bg{position:absolute;inset:0;background-image:url("bg.webp");background-size:cover;
  background-position:center 28%;background-repeat:no-repeat}
.hero-bg::after{content:"";position:absolute;inset:0;
  background:
    linear-gradient(90deg,rgba(16,14,11,.96) 0%,rgba(16,14,11,.86) 34%,rgba(16,14,11,.42) 68%,rgba(16,14,11,.58) 100%),
    linear-gradient(180deg,rgba(16,14,11,.35) 0%,rgba(16,14,11,0) 30%,rgba(16,14,11,.55) 82%,var(--bg) 100%)}
.hero-inner{position:relative;z-index:1;max-width:var(--maxw);margin:0 auto;
  padding:104px 24px 92px;min-height:600px;display:flex;align-items:center}
.hero-copy{max-width:620px}
.kicker{display:inline-flex;align-items:center;gap:10px;font-size:12.5px;font-weight:700;
  letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}
.kicker::before{content:"";width:26px;height:1px;background:var(--accent)}
.hero h1{font-size:clamp(30px,4.8vw,54px);margin:20px 0 20px;letter-spacing:-.03em;line-height:1.16}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero .lead{font-size:clamp(15px,1.6vw,18px);color:#e2dbcd;max-width:540px;margin:0 0 30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:22px}
.hero-meta{display:flex;gap:22px;flex-wrap:wrap;color:var(--ink-3);font-size:13.5px}
.hero-meta span{display:inline-flex;align-items:center;gap:7px}
.hero-meta span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent)}
@media(max-width:820px){
  .hero-inner{padding:76px 20px 64px;min-height:0}
  .hero-bg{background-position:center 22%}
  .hero-bg::after{background:
    linear-gradient(180deg,rgba(16,14,11,.55) 0%,rgba(16,14,11,.82) 42%,rgba(16,14,11,.94) 72%,var(--bg) 100%)}
  .hero-actions .btn{flex:1 1 auto}
}

/* ---------- generic section ---------- */
.sec{padding:88px 0}
.sec.tight{padding:60px 0}
.sec.band{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.title{font-size:clamp(26px,3.6vw,40px);margin-top:16px;max-width:780px}
.sub{color:var(--ink-2);font-size:clamp(15px,1.7vw,17px);margin-top:14px;max-width:640px}
.center{text-align:center}
.center .kicker{justify-content:center}
.center .title,.center .sub{margin-left:auto;margin-right:auto}

/* ---------- three editorial points ---------- */
.points{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);margin-top:44px}
.point{padding:30px 30px 6px 0}
.point + .point{border-left:1px solid var(--line);padding-left:30px}
.point .n{font-size:12.5px;font-weight:700;letter-spacing:.14em;color:var(--accent)}
.point h3{font-size:18px;margin:12px 0 7px}
.point p{color:var(--ink-2);font-size:14.5px;margin:0}
@media(max-width:760px){
  .points{grid-template-columns:1fr}
  .point{padding:24px 0 0}
  .point + .point{border-left:none;border-top:1px solid var(--line);padding-left:0;margin-top:24px}
}

/* ---------- editorial note ---------- */
.note{max-width:740px;border-left:2px solid var(--accent);padding:2px 0 2px 24px;margin-top:52px}
.note h3{font-size:17px;margin-bottom:8px}
.note p{color:var(--ink-2);font-size:15px;margin:0 0 .55em}
.note p:last-child{margin-bottom:0}

/* ---------- app mockup (dark) ---------- */
.mock-wrap{margin-top:44px;border:1px solid var(--line);border-radius:16px;overflow:hidden;
  background:var(--panel);box-shadow:0 30px 80px rgba(0,0,0,.45)}
.mock-bar{display:flex;align-items:center;gap:7px;padding:11px 14px;background:#171410;border-bottom:1px solid var(--line)}
.mock-bar i{width:11px;height:11px;border-radius:50%;display:inline-block}
.mock-bar .d{background:#8f5353}.mock-bar .y{background:#8f7a42}.mock-bar .g{background:#5c7f52}
.mock-bar span{margin-left:10px;font-size:12px;color:var(--ink-3);font-weight:600;letter-spacing:.02em}
.mock-body{display:grid;grid-template-columns:172px 1fr;min-height:318px}
.mock-side{background:#161310;border-right:1px solid var(--line);padding:16px 12px;font-size:13px}
.mock-side .grp{color:var(--ink-3);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;margin:14px 6px 8px}
.mock-side .item{display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:8px;
  color:var(--ink-2);margin-bottom:2px}
.mock-side .item.active{background:rgba(200,210,78,.12);color:var(--accent);font-weight:600}
.mock-side .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);opacity:.65;flex:none}
.mock-main{padding:16px 18px}
.mock-main .top{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.mock-main .top h4{font-size:14.5px;color:var(--ink)}
.mock-main .pill{font-size:11px;background:rgba(200,210,78,.14);color:var(--accent);
  padding:4px 10px;border-radius:999px;font-weight:700;white-space:nowrap}
.mock-row{display:flex;align-items:center;gap:11px;padding:10px 8px;border-radius:8px;font-size:13px}
.mock-row + .mock-row{border-top:1px solid rgba(242,237,227,.06)}
.mock-row .ic{width:26px;height:26px;border-radius:7px;background:rgba(255,255,255,.06);
  display:grid;place-items:center;flex:none;color:var(--ink-2)}
.mock-row .nm{color:var(--ink);font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mock-row .tag{margin-left:auto;font-size:11px;padding:3px 9px;border-radius:6px;
  background:rgba(169,199,125,.14);color:var(--ok);font-weight:700;white-space:nowrap}
.mock-row .tag.warn{background:rgba(224,180,95,.15);color:var(--amber)}
@media(max-width:640px){
  .mock-body{grid-template-columns:1fr;min-height:0}
  .mock-side{display:none}
  .mock-main{padding:14px}
  .mock-row{font-size:12.5px;gap:9px}
  .mock-row .nm{max-width:130px}
}

/* ---------- feature list ---------- */
.flist{margin-top:36px;border-top:1px solid var(--line)}
.fitem{display:grid;grid-template-columns:76px 1fr;gap:26px;padding:34px 0;border-bottom:1px solid var(--line)}
.fitem .no{font-size:13px;font-weight:800;letter-spacing:.12em;color:var(--accent);padding-top:5px}
.fitem h3{font-size:20px;margin-bottom:9px}
.fitem p{color:var(--ink-2);font-size:15.5px;margin:0;max-width:720px}
.fitem .hint{margin-top:13px;font-size:14px;color:var(--ink-3);border-left:2px solid var(--line-2);
  padding-left:15px;max-width:640px}
@media(max-width:600px){
  .fitem{grid-template-columns:1fr;gap:6px;padding:26px 0}
  .fitem h3{font-size:18px}
}

/* ---------- download ---------- */
.dl-panel{display:grid;grid-template-columns:1.12fr .88fr;margin-top:40px;
  border:1px solid var(--line);border-radius:18px;overflow:hidden;background:var(--panel)}
.dl-left{padding:38px}
.dl-left .os{font-size:13px;color:var(--ink-3);letter-spacing:.05em;text-transform:uppercase;font-weight:700}
.dl-left h2{font-size:28px;margin:10px 0 12px}
.dl-left p{color:var(--ink-2);font-size:15px;margin:0 0 24px;max-width:380px}
.dl-right{padding:38px;background:var(--panel-2);border-left:1px solid var(--line)}
.specs{list-style:none;padding:0;margin:0;display:grid}
.specs li{display:flex;justify-content:space-between;gap:14px;font-size:14.5px;
  padding:12px 0;border-bottom:1px dashed var(--line)}
.specs li:last-child{border-bottom:none}
.specs li span:first-child{color:var(--ink-3)}
.specs li span:last-child{font-weight:600;color:var(--ink);text-align:right}
@media(max-width:720px){
  .dl-panel{grid-template-columns:1fr}
  .dl-left,.dl-right{padding:28px 24px}
  .dl-right{border-left:none;border-top:1px solid var(--line)}
  .dl-left .btn{width:100%}
}
.dl-btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:4px}
.dl-btns .btn{flex:0 0 auto}
.dl-note{margin-top:38px;font-size:14px;color:var(--amber);border:1px solid rgba(224,180,95,.3);
  background:rgba(224,180,95,.08);border-radius:10px;padding:12px 16px;line-height:1.6}
.dl-tag{display:inline-block;font-size:11.5px;font-weight:700;letter-spacing:.04em;
  padding:3px 9px;border-radius:999px;margin-left:8px;vertical-align:middle}
.dl-tag.new{background:rgba(200,210,78,.16);color:var(--accent)}
.dl-tag.old{background:rgba(242,237,227,.1);color:var(--ink-2)}
@media(max-width:720px){.dl-btns .btn{width:100%}}

.changelog{margin-top:60px}
.changelog h3{font-size:18px;margin-bottom:18px}
.log{border-left:1px solid var(--line);padding-left:24px;position:relative}
.log::before{content:"";position:absolute;left:-4.5px;top:6px;width:8px;height:8px;border-radius:50%;background:var(--accent)}
.log .row{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.log .ver{font-weight:800;color:var(--ink)}
.log .date{color:var(--ink-3);font-size:13.5px}
.log ul{margin:10px 0 0;padding-left:18px;color:var(--ink-2);font-size:15px}
.log li{margin-bottom:5px}

.tips{margin-top:52px;border:1px solid var(--line);border-radius:14px;padding:26px 28px;background:var(--panel)}
.tips h3{font-size:16px;margin-bottom:12px}
.tips ul{margin:0;padding-left:18px;color:var(--ink-2);font-size:15px}
.tips li{margin-bottom:7px}

/* ---------- prose / about ---------- */
.prose{max-width:740px}
.prose p{color:var(--ink-2);font-size:16.5px;line-height:1.85}
.prose h2{font-size:22px;margin:40px 0 14px}
.prose a{color:var(--accent);font-weight:600;border-bottom:1px solid rgba(200,210,78,.4)}

/* ---------- faq ---------- */
.faq{margin-top:30px;border-top:1px solid var(--line)}
.faq-item{padding:24px 0;border-bottom:1px solid var(--line)}
.faq-item h3{font-size:16.5px;margin-bottom:7px}
.faq-item p{color:var(--ink-2);font-size:15px;margin:0}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);background:var(--bg-2);padding:36px 0}
.foot-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:flex;
  justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;color:var(--ink-3);font-size:13.5px}
.foot-inner .brand{font-size:15px}
footer a{color:var(--ink-2)}
footer a:hover{color:var(--accent)}

/* ---------- reveal（仅 JS 可用时启用，无 JS 时内容照常显示） ---------- */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.js .reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.js .reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* ---------- page head (inner pages) ---------- */
.page-head{padding:78px 0 8px;border-bottom:1px solid var(--line);background:
  radial-gradient(900px 300px at 12% -10%,rgba(200,210,78,.08),transparent 60%)}
.page-head .title{margin-top:16px}
.page-head .sub{margin-bottom:34px}
@media(max-width:760px){.page-head{padding:56px 0 4px}}