/* =========================================================
   Amethyst · 官网样式
   实底顶栏 / 等宽正文 / 衬线标题 / 零圆角 / 零阴影
   版式走「说明书」：规格表 + 分组清单 + 步骤，不做宫格卡片
   ========================================================= */

:root{
  --bg:#0b0a10;
  --panel:#111019;
  --line:#1f1c2c;
  --line2:#2c2840;

  --fg:#cfc9dc;
  --fg2:#8b84a3;
  --fg3:#5c5673;

  --acc:#a78bfa;
  --acc-hi:#c3aeff;
  --bar:#3b2680;
  --bar-line:#2a1a5e;
  --bar-fg:#ece6ff;
  --bar-fg2:#b9a8e8;
  --bar-fg3:#c0b0ea;
  --warn:#ffb454;

  --mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Consolas,"Cascadia Mono",Menlo,monospace;
  --serif:Georgia,"Times New Roman","Noto Serif SC","Songti SC","SimSun",serif;

  --container:1080px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--fg);
  font-family:var(--mono);
  font-size:13.5px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;transition:color .15s,border-color .15s,opacity .15s}
button{font:inherit;cursor:pointer;color:inherit}
img{display:block;max-width:100%}
p{margin:0 0 18px;color:var(--fg2)}
::selection{background:var(--acc);color:var(--bar-fg)}
:focus-visible{outline:1px solid var(--acc);outline-offset:3px}
kbd{font-family:var(--mono);font-size:11.5px;color:var(--fg);border:1px solid var(--line2);padding:1px 6px}
code{font-family:var(--mono);font-size:12px;color:var(--fg);background:rgba(207,201,220,.07);border:1px solid var(--line);padding:1px 6px}

h1,h2{margin:0;font-family:var(--serif);font-weight:700;letter-spacing:-.01em;color:var(--fg)}
h1{font-size:clamp(30px,4.6vw,50px);line-height:1.14}
h2{font-size:clamp(21px,2.6vw,28px);line-height:1.3}
em{font-style:italic;color:var(--acc)}

.container{width:min(100%,var(--container));margin-inline:auto;padding-inline:32px}

.skip-link{position:absolute;left:-9999px;top:10px;padding:10px 18px;background:var(--acc);color:var(--bar-fg);z-index:100}
.skip-link:focus{left:16px}

/* ---------- 顶栏 ---------- */
.site-header{position:sticky;top:0;z-index:50;background:var(--bar);border-bottom:1px solid var(--bar-line)}
.nav{display:flex;align-items:center;justify-content:space-between;min-height:56px;gap:24px}

.nav__brand{display:flex;align-items:center;gap:9px;line-height:1.15;color:var(--bar-fg)}
.nav__brand:hover{color:var(--bar-fg);opacity:.82}
.nav__mark{width:21px;height:21px;flex:none;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linejoin:round;stroke-linecap:round}
.nav__brand b{display:block;font-size:16px;font-weight:700;letter-spacing:.01em}
.nav__brand small{display:block;font-size:10px;font-weight:400;letter-spacing:.08em;color:var(--bar-fg3)}

.nav__links{display:flex;align-items:center;gap:26px;list-style:none;margin:0;padding:0}
.nav__links a{font-size:12.5px;color:var(--bar-fg2)}
.nav__links a:hover{color:var(--bar-fg)}
.nav__links a[aria-current="page"]{color:var(--bar-fg);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1.5px}
.nav__links a.nav__dl{background:var(--acc);color:#0c0718;padding:6px 15px;font-weight:600}
.nav__links a.nav__dl:hover{background:var(--acc-hi);color:#0c0718}

.nav__toggle{display:none;width:36px;height:32px;background:none;border:1px solid var(--bar-fg2);padding:0;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav__toggle i{display:block;width:15px;height:1.5px;background:var(--bar-fg)}

/* ---------- 首屏 ---------- */
.hero{padding:76px 0 0}
.hero__tag{margin:0 0 18px;font-size:11.5px;letter-spacing:.16em;color:var(--fg3)}
.hero__lead{margin:20px 0 0;max-width:60ch;font-size:14px;line-height:2}
.hero .actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}

.btn{display:inline-flex;align-items:center;gap:7px;min-height:38px;padding:8px 16px;border:1px solid var(--line2);font-size:12.5px;color:var(--fg)}
.btn:hover{border-color:var(--acc);color:var(--acc)}
.btn--primary{background:var(--acc);border-color:var(--acc);color:var(--bar-fg);font-weight:600}
.btn--primary:hover{background:var(--acc-hi);border-color:var(--acc-hi);color:var(--bar-fg)}

.shot{margin:52px 0 0}
.shot img{width:100%;height:auto;border:1px solid var(--line2);background:var(--panel)}
.shot figcaption{margin-top:12px;font-size:11.5px;color:var(--fg3)}

/* ---------- 规格表 ---------- */
.spec{margin-top:64px;padding-block:28px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.spec dl{display:grid;grid-template-columns:repeat(3,1fr);gap:18px 40px;margin:0}
.spec dt{font-size:11px;letter-spacing:.14em;color:var(--fg3);margin-bottom:2px}
.spec dd{margin:0;font-size:12.5px;color:var(--fg)}

/* ---------- 区块 ---------- */
.block{padding-block:72px 0}
.block__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 28px;margin-bottom:28px}
.block__head p{margin:0;font-size:12.5px;color:var(--fg3)}

/* 分组清单 */
.list{display:flex;flex-direction:column;margin:0}
.list__row{display:grid;grid-template-columns:190px minmax(0,1fr);gap:8px 32px;padding:18px 0;border-top:1px solid var(--line)}
.list__row:last-child{border-bottom:1px solid var(--line)}
.list__name{font-size:12.5px;color:var(--acc);letter-spacing:.02em}
.list__row p{margin:0;font-size:12.5px;line-height:1.9;color:var(--fg2)}

/* 步骤 */
.steps{margin:0;padding:0;list-style:none;counter-reset:s}
.steps li{counter-increment:s;display:grid;grid-template-columns:44px minmax(0,1fr);gap:6px 20px;padding:20px 0;border-top:1px solid var(--line)}
.steps li:last-child{border-bottom:1px solid var(--line)}
.steps li::before{content:counter(s,decimal-leading-zero);font-size:11.5px;letter-spacing:.1em;color:var(--acc);padding-top:2px}
.steps h3{margin:0 0 4px;font-family:var(--serif);font-size:16px;font-weight:700;color:var(--fg)}
.steps p{margin:0;font-size:12.5px}

.keys{display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;margin-top:22px;font-size:12px;color:var(--fg2)}
.keys span.label{font-size:11px;letter-spacing:.14em;color:var(--fg3)}

/* 下载 */
.get{padding-block:72px 0}
.get__box{border:1px solid var(--line2);padding:32px 34px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px}
.get__box h2{margin-bottom:6px}
.get__box p{margin:0;font-size:12.5px}
.get .actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- 页脚 ---------- */
.site-footer{margin-top:76px;border-top:1px solid var(--line);padding:26px 0 40px}
.foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px 32px;font-size:11.5px;color:var(--fg3)}
.foot__links{display:flex;flex-wrap:wrap;gap:8px 20px}
.foot__links a:hover{color:var(--acc)}

/* ---------- 响应式 ---------- */
@media (max-width:820px){
  .spec dl{grid-template-columns:repeat(2,1fr)}
  .list__row{grid-template-columns:1fr;gap:4px}
  .list__name{color:var(--fg);font-weight:600}
  .get__box{flex-direction:column;align-items:flex-start}
}

@media (max-width:640px){
  .container{padding-inline:20px}
  .nav{min-height:54px}
  .nav__toggle{display:flex}
  .nav__links{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:0;background:var(--bar);border-bottom:1px solid var(--bar-line);padding:6px 20px 14px;display:none}
  .nav__links.is-open{display:flex}
  .nav__links li{border-top:1px solid rgba(255,255,255,.09)}
  .nav__links li:first-child{border-top:0}
  .nav__links a{display:block;padding:11px 0;font-size:13px;color:var(--bar-fg2)}
  .nav__links a.nav__dl{text-align:center;margin-top:10px;padding:9px 14px}
  .hero{padding-top:44px}
  .shot{margin-top:36px}
  .spec dl{grid-template-columns:1fr;gap:14px}
  .block,.get{padding-block:56px 0}
  .steps li{grid-template-columns:32px minmax(0,1fr)}
  .get__box{padding:24px 20px}
}

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