/* ============================================================
   HMCL-AE 官网 · Material 3 设计系统(自托管 · 无外部依赖 · 亮暗双主题)
   母题:"会调工具的启动器"。三页共享:index / download / feedback。
   ============================================================ */
:root{
  /* MD3 tonal palette(seed 紫 #6750a4) */
  --primary:#6750a4; --on-primary:#ffffff; --primary-container:#eaddff; --on-primary-container:#21005d;
  --secondary:#625b71; --secondary-container:#e8def8; --on-secondary-container:#1d192b;
  --tertiary:#7d5260; --tertiary-container:#ffd8e4;
  --bg:#fef7ff; --surface:#fef7ff; --surface-1:#f7f2fa; --surface-2:#f3edf7; --surface-3:#eee8f4;
  --on-surface:#1d1b20; --on-surface-var:#49454f; --outline:#79747e; --outline-var:#cac4d0;
  --ok:#1a9e55; --warn:#8f6c00;
  --ease-emph:cubic-bezier(.2,0,0,1); --ease-emph-dec:cubic-bezier(.05,.7,.1,1); --ease-std:cubic-bezier(.2,0,0,1);
  --dur-s:.2s; --dur-m:.4s; --dur-l:.55s;
  --shape-xl:28px; --shape-l:16px; --shape-m:12px; --shape-s:8px;
  --mono:ui-monospace,"Cascadia Code",Consolas,"SF Mono",Menlo,monospace;
  --sans:"Roboto",system-ui,-apple-system,"Segoe UI","Microsoft YaHei","PingFang SC","Noto Sans CJK SC",sans-serif;
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){:root{
  --primary:#d0bcff; --on-primary:#381e72; --primary-container:#4f378b; --on-primary-container:#eaddff;
  --secondary:#ccc2dc; --secondary-container:#4a4458; --on-secondary-container:#e8def8;
  --tertiary:#efb8c8; --tertiary-container:#633b48;
  --bg:#141218; --surface:#141218; --surface-1:#1d1b20; --surface-2:#211f26; --surface-3:#2b2930;
  --on-surface:#e6e0e9; --on-surface-var:#cac4d0; --outline:#938f99; --outline-var:#49454f;
  --ok:#3fce7e; --warn:#e2b158;
}}
:root[data-theme="light"]{--primary:#6750a4;--on-primary:#fff;--primary-container:#eaddff;--on-primary-container:#21005d;--secondary-container:#e8def8;--on-secondary-container:#1d192b;--tertiary-container:#ffd8e4;--bg:#fef7ff;--surface:#fef7ff;--surface-1:#f7f2fa;--surface-2:#f3edf7;--surface-3:#eee8f4;--on-surface:#1d1b20;--on-surface-var:#49454f;--outline:#79747e;--outline-var:#cac4d0;--ok:#1a9e55;--warn:#8f6c00;color-scheme:light}
:root[data-theme="dark"]{--primary:#d0bcff;--on-primary:#381e72;--primary-container:#4f378b;--on-primary-container:#eaddff;--secondary-container:#4a4458;--on-secondary-container:#e8def8;--tertiary-container:#633b48;--bg:#141218;--surface:#141218;--surface-1:#1d1b20;--surface-2:#211f26;--surface-3:#2b2930;--on-surface:#e6e0e9;--on-surface-var:#cac4d0;--outline:#938f99;--outline-var:#49454f;--ok:#3fce7e;--warn:#e2b158;color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--sans);font-size:16px;line-height:1.65;color:var(--on-surface);background:var(--bg);
  -webkit-font-smoothing:antialiased;overflow-x:hidden;min-height:100vh}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
code{font-family:var(--mono);font-size:.88em;background:var(--surface-2);padding:.1em .45em;border-radius:6px}
h1,h2,h3{text-wrap:balance}
.container{max-width:1080px;margin:0 auto;padding:0 22px}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}

/* ---------- state layer + ripple ---------- */
.state{position:relative;overflow:hidden;isolation:isolate}
.state::before{content:"";position:absolute;inset:0;background:currentColor;opacity:0;transition:opacity var(--dur-s) var(--ease-std);z-index:-1}
.state:hover::before{opacity:.08}
.state:active::before{opacity:.12}
.ripple{position:absolute;border-radius:50%;background:currentColor;opacity:.22;transform:scale(0);animation:rip .5s var(--ease-emph-dec) forwards;pointer-events:none;z-index:0}
@keyframes rip{to{transform:scale(2.4);opacity:0}}

/* ---------- top app bar ---------- */
.bar{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--surface) 80%,transparent);
  backdrop-filter:blur(16px) saturate(1.4);-webkit-backdrop-filter:blur(16px) saturate(1.4);
  border-bottom:1px solid transparent;transition:border-color var(--dur-m),background var(--dur-m)}
.bar.scrolled{border-bottom-color:var(--outline-var);background:color-mix(in srgb,var(--surface-2) 88%,transparent)}
.bar .container{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--on-surface);letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand .logo{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:var(--primary);color:var(--on-primary);
  box-shadow:0 2px 8px color-mix(in srgb,var(--primary) 45%,transparent);transition:transform var(--dur-m) var(--ease-emph)}
.brand:hover .logo{transform:rotate(-8deg) scale(1.06)}
.brand .ae{color:var(--primary)}
.nav{margin-left:auto;display:flex;gap:2px;align-items:center}
.nav a{color:var(--on-surface-var);padding:9px 15px;border-radius:99px;font-size:14.5px;font-weight:500}
.nav a:hover{text-decoration:none;color:var(--on-surface)}
.nav a.active{color:var(--on-secondary-container);background:var(--secondary-container);font-weight:600}
.theme-btn{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;cursor:pointer;color:var(--on-surface-var);
  background:none;border:none;font-size:19px;margin-left:4px}

/* ---------- hero ---------- */
.hero{position:relative;padding:96px 0 60px;text-align:center;overflow:hidden}
.hero .blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;z-index:0;pointer-events:none}
.hero .b1{width:520px;height:520px;background:var(--primary-container);top:-220px;left:50%;transform:translateX(-55%);animation:float1 14s var(--ease-std) infinite alternate}
.hero .b2{width:360px;height:360px;background:var(--tertiary-container);top:-40px;right:-80px;opacity:.4;animation:float2 17s var(--ease-std) infinite alternate}
@keyframes float1{to{transform:translateX(-45%) translateY(40px) scale(1.1)}}
@keyframes float2{to{transform:translateY(60px) scale(.9)}}
.hero .container{position:relative;z-index:1}
.pill{display:inline-flex;align-items:center;gap:8px;padding:6px 14px 6px 8px;border-radius:99px;background:var(--surface-2);
  border:1px solid var(--outline-var);font-size:13px;color:var(--on-surface-var);font-weight:500;margin-bottom:26px}
.pill .tag{background:var(--primary);color:var(--on-primary);border-radius:99px;padding:2px 10px;font-size:12px;font-weight:700}
h1.title{margin:0 0 18px;font-size:clamp(34px,6.2vw,60px);line-height:1.08;letter-spacing:-.025em;font-weight:800}
.grad{background:linear-gradient(100deg,var(--primary),var(--tertiary));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{margin:0 auto 36px;max-width:620px;color:var(--on-surface-var);font-size:clamp(16px,2.4vw,19px)}
.cta{display:flex;flex-wrap:wrap;justify-content:center;gap:14px}
.hero .meta{margin-top:30px;font-size:13px;color:var(--on-surface-var)}
.hero .meta a{color:inherit;text-decoration:underline;text-decoration-color:var(--outline-var)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;padding:0 26px;height:52px;border-radius:99px;font-size:16px;font-weight:600;
  border:none;cursor:pointer;font-family:inherit;text-decoration:none;transition:box-shadow var(--dur-s),transform var(--dur-s) var(--ease-emph),filter var(--dur-s)}
.btn:hover{transform:translateY(-2px);text-decoration:none}.btn:active{transform:translateY(0)}
.btn-filled,.btn-primary{background:var(--primary);color:var(--on-primary);box-shadow:0 1px 3px rgba(0,0,0,.3),0 6px 18px color-mix(in srgb,var(--primary) 40%,transparent)}
.btn-filled:hover,.btn-primary:hover{color:var(--on-primary);filter:brightness(1.05)}
.btn-tonal{background:var(--secondary-container);color:var(--on-secondary-container)}
.btn-tonal:hover{color:var(--on-secondary-container)}
.fab{position:fixed;right:24px;bottom:24px;z-index:40;height:60px;padding:0 24px;border-radius:20px;background:var(--primary-container);
  color:var(--on-primary-container);box-shadow:0 4px 12px rgba(0,0,0,.25),0 12px 32px color-mix(in srgb,var(--primary) 30%,transparent);
  display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:15.5px;border:none;cursor:pointer;font-family:inherit;
  transform:translateY(120px);transition:transform var(--dur-l) var(--ease-emph-dec)}
.fab.show{transform:translateY(0)}
.fab:hover{transform:translateY(-3px)}

/* ---------- 工具调用链动画(首页母题) ---------- */
.demo{max-width:560px;margin:44px auto 0;background:var(--surface-1);border:1px solid var(--outline-var);border-radius:var(--shape-xl);
  box-shadow:0 2px 6px rgba(0,0,0,.06),0 20px 50px rgba(0,0,0,.10);overflow:hidden;text-align:left}
.demo-top{display:flex;align-items:center;gap:7px;padding:13px 18px;border-bottom:1px solid var(--outline-var);background:var(--surface-2)}
.demo-top .d{width:11px;height:11px;border-radius:50%;background:var(--outline-var)}
.demo-top .lbl{margin-left:8px;font-size:12.5px;color:var(--on-surface-var);font-family:var(--mono)}
.demo-body{padding:18px 20px;min-height:190px}
.msg-user{background:var(--primary);color:var(--on-primary);padding:9px 15px;border-radius:18px 18px 5px 18px;display:inline-block;
  font-size:14.5px;max-width:85%;margin-bottom:14px;font-weight:500}
.toolchip{display:flex;align-items:center;gap:10px;padding:9px 13px;border-radius:12px;background:var(--surface-2);margin:8px 0;
  font-size:13.5px;color:var(--on-surface-var);opacity:0;transform:translateY(8px);transition:opacity var(--dur-m),transform var(--dur-m) var(--ease-emph-dec)}
.toolchip.in{opacity:1;transform:none}
.toolchip .tk{font-family:var(--mono);font-size:12.5px;color:var(--primary);font-weight:600}
/* 状态槽:转圈与对钩绝对定位、完全重叠占同一位置 —— 转圈转完消失,对钩原地淡出,绝不跳位 */
.toolchip .stat{margin-left:auto;position:relative;width:16px;height:16px;flex:none}
.toolchip .stat .spin{position:absolute;inset:0;border:2px solid var(--outline-var);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}
.toolchip .stat .ck{position:absolute;inset:0;display:grid;place-items:center;color:var(--ok);font-weight:700;font-size:13px;line-height:1;opacity:0;transition:opacity var(--dur-s)}
.toolchip.done .stat .spin{display:none}
.toolchip.done .stat .ck{opacity:1}
@keyframes spin{to{transform:rotate(360deg)}}
.demo-done{font-size:13.5px;color:var(--ok);font-weight:600;opacity:0;transition:opacity var(--dur-m);margin-top:6px}
.demo-done.in{opacity:1}

/* ---------- sections + cards(首页) ---------- */
.section{padding:64px 0}
.section h2{text-align:center;font-size:clamp(24px,3.8vw,34px);margin:0 0 10px;letter-spacing:-.02em;font-weight:750}
.section .ssub{text-align:center;color:var(--on-surface-var);margin:0 auto 44px;max-width:600px}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(290px,1fr))}
.card{background:var(--surface-1);border:1px solid var(--outline-var);border-radius:var(--shape-l);padding:26px 24px;
  transition:transform var(--dur-m) var(--ease-emph),box-shadow var(--dur-m),background var(--dur-m),opacity var(--dur-m);
  opacity:0;transform:translateY(26px)}
.card.reveal{opacity:1;transform:none}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.10);background:var(--surface-2)}
.card .ic{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;font-size:26px;margin-bottom:16px;
  background:var(--primary-container);color:var(--on-primary-container);transition:transform var(--dur-m) var(--ease-emph)}
.ic .ms{width:28px;height:28px;fill:currentColor}
.card:hover .ic{transform:scale(1.1) rotate(-6deg)}
.card h3{margin:0 0 8px;font-size:18px;font-weight:700}
.card p{margin:0;color:var(--on-surface-var);font-size:14.5px}
.card .num{position:absolute;top:18px;right:20px;font-size:13px;font-weight:800;color:var(--primary);font-family:var(--mono)}
.step{position:relative}

/* ---------- 通用页头(下载/反馈) ---------- */
.page-head{padding:52px 0 6px}
.page-head h1{margin:0 0 12px;font-size:clamp(27px,4.6vw,40px);letter-spacing:-.02em;font-weight:800}
.page-head p{margin:0;color:var(--on-surface-var);max-width:680px;font-size:16px}

/* ---------- 下载页 ---------- */
.dl-status{padding:48px 0;text-align:center;color:var(--on-surface-var)}
.release-list{padding:28px 0 20px;display:grid;gap:20px}
.release-card{background:var(--surface-1);border:1px solid var(--outline-var);border-radius:var(--shape-l);overflow:hidden;
  transition:box-shadow var(--dur-m),transform var(--dur-m) var(--ease-emph)}
.release-card:hover{box-shadow:0 8px 28px rgba(0,0,0,.10)}
.release-card.latest{border-color:color-mix(in srgb,var(--primary) 60%,var(--outline-var));
  box-shadow:0 0 0 1px color-mix(in srgb,var(--primary) 40%,transparent),0 8px 28px rgba(0,0,0,.08)}
.release-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 14px;padding:20px 24px 6px}
.release-head h2{margin:0;font-size:22px;font-weight:750}
.release-head .date{color:var(--on-surface-var);font-size:13.5px}
.release-head .notes-link{margin-left:auto;font-size:13.5px;font-weight:600}
.tag-pill{font-size:12px;font-weight:700;padding:3px 11px;border-radius:99px;border:1px solid transparent}
.tag-pill.latest-pill{background:var(--primary);color:var(--on-primary)}
.tag-pill.channel-beta{background:color-mix(in srgb,var(--warn) 16%,transparent);color:var(--warn);border-color:color-mix(in srgb,var(--warn) 40%,transparent)}
.tag-pill.channel-alpha{background:color-mix(in srgb,var(--tertiary) 20%,transparent);color:var(--tertiary);border-color:color-mix(in srgb,var(--tertiary) 45%,transparent)}
.tag-pill.channel-stable{background:color-mix(in srgb,var(--ok) 16%,transparent);color:var(--ok);border-color:color-mix(in srgb,var(--ok) 40%,transparent)}
.highlights{margin:10px 24px 4px;padding-left:20px;color:var(--on-surface-var);font-size:14.5px}
.highlights li{margin:3px 0}
.artifact-list{list-style:none;margin:14px 0 0;padding:0}
.artifact-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;padding:15px 24px;border-top:1px solid var(--outline-var)}
.artifact-file{display:flex;align-items:center;gap:9px;font-family:var(--mono);font-size:14px;font-weight:600;min-width:0;word-break:break-all}
.artifact-file .os-ico{font-size:18px;flex:none}
.artifact-size{color:var(--on-surface-var);font-size:13px;white-space:nowrap}
.sha{font-family:var(--mono);font-size:12px;color:var(--on-surface-var);background:var(--surface-2);border:1px solid var(--outline-var);
  border-radius:8px;padding:4px 10px;cursor:pointer;user-select:none;white-space:nowrap;transition:color var(--dur-s),border-color var(--dur-s),background var(--dur-s)}
.sha:hover{color:var(--on-surface);border-color:var(--outline)}
.sha.copied{color:var(--ok);border-color:var(--ok)}
.src-group{display:flex;flex-wrap:wrap;gap:8px;margin-left:auto}
.src-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:99px;font-size:13.5px;font-weight:600;
  border:1px solid var(--outline-var);background:var(--surface);color:var(--on-surface);
  transition:transform var(--dur-s) var(--ease-emph),border-color var(--dur-s),background var(--dur-s),color var(--dur-s)}
.src-btn:hover{text-decoration:none;transform:translateY(-1px);border-color:var(--primary);color:var(--primary)}
.src-btn.primary-src{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.src-btn.primary-src:hover{color:var(--on-primary);filter:brightness(1.06)}
.src-note{font-size:11px;font-weight:400;opacity:.85}
.dl-fallback{margin:26px 0;padding:28px;background:var(--surface-1);border:1px dashed var(--outline-var);border-radius:var(--shape-l);
  text-align:center;color:var(--on-surface-var)}
.dl-fallback .btn{margin-top:8px}
.dl-tips{margin:8px 0 34px;padding:18px 22px;background:var(--surface-1);border:1px solid var(--outline-var);border-radius:var(--shape-l);
  color:var(--on-surface-var);font-size:13.5px}
.dl-tips ul{margin:8px 0 0;padding-left:20px}
.dl-tips li{margin:3px 0}

/* ---------- 反馈页 ---------- */
.prose{max-width:780px}
.prose h2{font-size:22px;margin:42px 0 14px;font-weight:750;letter-spacing:-.01em}
.prose h2:first-child{margin-top:28px}
.prose p,.prose li{color:var(--on-surface-var);font-size:15.5px}
.prose ul{padding-left:22px}
.prose strong{color:var(--on-surface);font-weight:600}
.info-card{background:var(--surface-1);border:1px solid var(--outline-var);border-radius:var(--shape-l);padding:22px 24px;margin:16px 0;
  transition:box-shadow var(--dur-m),transform var(--dur-m) var(--ease-emph)}
.info-card:hover{box-shadow:0 8px 24px rgba(0,0,0,.08);transform:translateY(-2px)}
.info-card h3{margin:0 0 12px;font-size:16.5px;display:flex;align-items:center;gap:9px;font-weight:700;color:var(--on-surface)}
.info-card h3 .mi{width:20px;height:20px;fill:var(--primary);flex:none}
.info-card p,.info-card li{color:var(--on-surface-var);font-size:14.5px;margin:5px 0}
.info-card ul{margin:8px 0;padding-left:20px}
.promise-grid{display:grid;gap:16px;margin:20px 0;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.promise-grid .info-card{margin:0}

/* ---------- footer ---------- */
footer{margin-top:56px;padding:34px 0 96px;border-top:1px solid var(--outline-var);color:var(--on-surface-var);font-size:13.5px}
footer .container{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between}
footer a{color:var(--on-surface-var);text-decoration:underline;text-decoration-color:var(--outline-var)}
footer a:hover{color:var(--on-surface)}

/* ---------- 响应式 ---------- */
@media (max-width:640px){
  .hero{padding:72px 0 44px}.section{padding:48px 0}
  /* 顶栏两行:brand+主题钮一行,导航整宽第二行(不换行、可横滑,避免中文链接被挤换行撑高) */
  .bar .container{height:auto;flex-wrap:wrap;gap:8px 12px;padding-top:10px;padding-bottom:10px}
  .brand{flex:1}
  .theme-btn{margin-left:0}
  .nav{order:3;flex-basis:100%;margin-left:0;flex-wrap:nowrap;gap:4px;overflow-x:auto;padding-bottom:2px;scrollbar-width:none}
  .nav::-webkit-scrollbar{display:none}
  .nav a{white-space:nowrap;flex:none;padding:7px 13px}
  .artifact-row,.release-head,.dl-tips{padding-left:18px;padding-right:18px}
  .highlights{margin-left:18px;margin-right:18px}
  .src-group{margin-left:0;width:100%}
  .src-btn{flex:1 1 auto;justify-content:center}
  .fab{right:16px;bottom:16px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .card,.toolchip,.demo-done{opacity:1!important;transform:none!important}.fab{transform:none}
}
/* 无 JS(或脚本环境不跑视口检测)时:内容默认可见,动画仅作渐进增强,绝不永久隐藏 */
html:not(.js) .card,html:not(.js) .toolchip,html:not(.js) .demo-done{opacity:1!important;transform:none!important}
html:not(.js) .toolchip .spin{display:none}
html:not(.js) .toolchip .ck{opacity:1}
html:not(.js) .fab{transform:none}