/* ============================================================
   闪码 FlashCode 官网 — 简洁 · 精密 · 电光蓝
   Nudge 变量：appearance / radius / spacing / typography / motion
   ============================================================ */
:root{
  --site-bg:#F6F7F9;
  --site-fg:#0D1424;
  --site-accent:#0B5CFF;
  --site-on-accent:#FFFFFF;
  --site-surface:#FFFFFF;
  --site-muted:#5B6472;
  --site-border:#E2E6ED;
  --site-font:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --site-radius:16px;
  --site-space:1;
  --site-type:1;
  --site-motion:1;

  /* 主题扩展色：闪电琥珀 / 连接绿 / 警示红 / 电光青 */
  --flash:#FFB224;
  --ok:#12B76A;
  --danger:#E5484D;
  --cyan:#00B8D9;
  --accent-soft:color-mix(in srgb, var(--site-accent) 9%, var(--site-surface));
  --accent-line:color-mix(in srgb, var(--site-accent) 26%, var(--site-border));
  --mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,"Courier New",monospace;

  --dur:calc(180ms * var(--site-motion, 1));
  --dur-slow:calc(560ms * var(--site-motion, 1));
  --gap:calc(24px * var(--site-space, 1));
  --sec-pad:calc(96px * var(--site-space, 1));
  --nav-h:64px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scrollbar-width:thin;scrollbar-color:color-mix(in srgb, var(--site-muted) 42%, var(--site-bg)) var(--site-bg)}
body{
  font-family:var(--site-font);
  background:var(--site-bg);
  color:var(--site-fg);
  font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:color-mix(in srgb, var(--site-accent) 22%, transparent)}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--site-bg)}
::-webkit-scrollbar-thumb{background:color-mix(in srgb, var(--site-muted) 38%, var(--site-bg));border-radius:8px;border:2px solid var(--site-bg)}
::-webkit-scrollbar-thumb:hover{background:color-mix(in srgb, var(--site-accent) 62%, var(--site-muted))}

img,svg{display:block}
.ic{width:20px;height:20px;flex:none}
.mono{font-family:var(--mono)}
a{color:inherit;text-decoration:none}
button{font-family:inherit;font-size:inherit;color:inherit;background:none;border:none;cursor:pointer}
.wrap{max-width:1160px;margin:0 auto;padding:0 var(--gap)}
.wrap-narrow{max-width:820px}
section{scroll-margin-top:calc(var(--nav-h) + 16px)}

h1,h2,h3{line-height:1.25;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(40px, 5.4vw, calc(62px * var(--site-type, 1)));letter-spacing:-.02em}
h2{font-size:clamp(28px, 3.4vw, calc(38px * var(--site-type, 1)))}
h2 .en,h1 .en{font-weight:700}
h3{font-size:calc(17px * var(--site-type, 1))}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;border-radius:calc(var(--site-radius) - 4px);
  font-weight:600;font-size:15px;line-height:1.2;white-space:nowrap;
  transition:transform var(--dur) ease, box-shadow var(--dur) ease, background var(--dur) ease, border-color var(--dur) ease;
}
.btn:active{transform:scale(.97)}
.btn .ic{width:18px;height:18px}
.btn-primary{
  background:linear-gradient(135deg, var(--site-accent), color-mix(in srgb, var(--site-accent) 72%, var(--cyan)));
  color:var(--site-on-accent);
  box-shadow:0 6px 18px color-mix(in srgb, var(--site-accent) 32%, transparent);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 26px color-mix(in srgb, var(--site-accent) 42%, transparent)}
.btn-ghost{
  background:var(--site-surface);color:var(--site-fg);
  border:1px solid var(--site-border);
}
.btn-ghost:hover{border-color:var(--accent-line);background:var(--accent-soft);transform:translateY(-2px)}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-block{width:100%}
.btn-dark-ghost{border:1px solid color-mix(in srgb, var(--site-bg) 26%, transparent);color:var(--site-bg);background:color-mix(in srgb, var(--site-bg) 7%, transparent)}
.btn-dark-ghost:hover{background:color-mix(in srgb, var(--site-bg) 14%, transparent)}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:100;height:var(--nav-h);
  background:color-mix(in srgb, var(--site-bg) 84%, transparent);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid color-mix(in srgb, var(--site-border) 72%, transparent);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700}
.brand-mark{
  width:32px;height:32px;border-radius:9px;display:grid;place-items:center;color:#fff;
  background:linear-gradient(135deg, var(--site-accent), color-mix(in srgb, var(--site-accent) 55%, var(--cyan)));
  box-shadow:0 3px 10px color-mix(in srgb, var(--site-accent) 35%, transparent);
}
.brand-mark .ic{width:18px;height:18px}
.brand-name{font-size:17px;display:flex;align-items:baseline;gap:7px}
.brand-en{font-size:12.5px;font-weight:600;color:var(--site-muted);letter-spacing:.02em}
.nav-links{display:flex;align-items:center;gap:calc(26px * var(--site-space, 1))}
.nav-links a:not(.btn){font-size:14.5px;font-weight:500;color:var(--site-muted);position:relative;padding:6px 0;transition:color var(--dur)}
.nav-links a:not(.btn):hover,.nav-links a:not(.btn).active{color:var(--site-fg)}
.nav-links a:not(.btn).active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;
  background:linear-gradient(90deg, var(--site-accent), var(--cyan));
}
.nav-cta{margin-left:6px}
.nav-burger{display:none;flex-direction:column;gap:5px;padding:8px}
.nav-burger span{width:20px;height:2px;border-radius:2px;background:var(--site-fg);transition:transform var(--dur), opacity var(--dur)}
.nav-burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:calc(var(--nav-h) + calc(72px * var(--site-space, 1))) 0 var(--sec-pad);overflow:hidden}
.hero-bg{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(560px 420px at 82% 12%, color-mix(in srgb, var(--site-accent) 11%, transparent), transparent 70%),
    radial-gradient(480px 380px at 6% 88%, color-mix(in srgb, var(--flash) 10%, transparent), transparent 70%),
    radial-gradient(circle, color-mix(in srgb, var(--site-fg) 7%, transparent) 1px, transparent 1.4px);
  background-size:auto,auto,26px 26px;
  mask-image:linear-gradient(180deg, #000 0%, #000 72%, transparent 100%);
  -webkit-mask-image:linear-gradient(180deg, #000 0%, #000 72%, transparent 100%);
}
.hero-grid{position:relative;display:grid;grid-template-columns:1.04fr .96fr;gap:calc(48px * var(--site-space, 1));align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.06em;
  color:var(--site-accent);background:var(--accent-soft);border:1px solid var(--accent-line);
  padding:6px 14px;border-radius:999px;margin-bottom:calc(20px * var(--site-space, 1));
}
.hero h1{margin-bottom:calc(22px * var(--site-space, 1))}
.hl{position:relative;color:var(--site-accent);white-space:nowrap}
.hl-bolt{position:absolute;width:.42em;height:.42em;right:-.52em;top:-.14em;color:var(--flash);filter:drop-shadow(0 2px 6px color-mix(in srgb, var(--flash) 55%, transparent))}
.lead{font-size:calc(17px * var(--site-type, 1));color:var(--site-muted);max-width:31em;margin-bottom:calc(30px * var(--site-space, 1))}
.kbd-inline{
  font-family:var(--mono);font-size:.86em;padding:2px 7px;border-radius:6px;
  background:var(--site-surface);border:1px solid var(--site-border);border-bottom-width:2px;color:var(--site-fg);
}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:calc(28px * var(--site-space, 1))}
.hero-chips{display:flex;gap:10px;flex-wrap:wrap;list-style:none}
.hero-chips li{
  display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:500;color:var(--site-muted);
  background:var(--site-surface);border:1px solid var(--site-border);border-radius:999px;padding:7px 14px;
}
.hero-chips .ic{width:15px;height:15px;color:var(--site-accent)}

/* ---------- Hero 舞台：手机 + Mac 剪贴板 ---------- */
.hero-stage{position:relative;display:flex;flex-direction:column;align-items:center;padding-bottom:calc(30px * var(--site-space, 1))}
.phone{
  width:302px;border-radius:46px;padding:9px;background:linear-gradient(160deg,#1A2338,#0B101F);
  box-shadow:0 30px 70px rgba(13,20,36,.28), 0 4px 16px rgba(13,20,36,.16), inset 0 1px 1px rgba(255,255,255,.14);
  transform:rotate(1.2deg);
  transition:transform var(--dur-slow) ease;
}
.hero-stage:hover .phone{transform:rotate(0deg) translateY(-4px)}
.phone-screen{position:relative;background:var(--site-bg);border-radius:38px;overflow:hidden;padding:14px 14px 20px}
.phone-screen::before{content:"";position:absolute;top:9px;left:50%;transform:translateX(-50%);width:10px;height:10px;border-radius:50%;background:#0B101F;opacity:.9}
.p-status{display:flex;justify-content:space-between;align-items:center;font-size:11.5px;font-weight:600;padding:2px 8px 12px;color:var(--site-fg)}
.p-status-icons{display:flex;align-items:center;gap:6px}
.p-status-icons .ic{width:13px;height:13px}
.p-battery{width:20px;height:10px;border:1.2px solid currentColor;border-radius:3px;position:relative;opacity:.85}
.p-battery::before{content:"";position:absolute;inset:1.6px;right:5px;background:currentColor;border-radius:1px}
.p-battery::after{content:"";position:absolute;right:-3.6px;top:2.4px;width:2px;height:4px;background:currentColor;border-radius:1px}
.p-header{display:flex;justify-content:space-between;align-items:center;padding:4px 4px 12px}
.p-title{display:flex;align-items:center;gap:7px;font-size:17px;font-weight:700}
.p-logo{width:22px;height:22px;border-radius:6px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--site-accent),color-mix(in srgb,var(--site-accent) 55%, var(--cyan)))}
.p-logo .ic{width:13px;height:13px}
.p-sync{display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:600;color:var(--ok)}
.dot{width:7px;height:7px;border-radius:50%;display:inline-block;flex:none}
.dot-ok{background:var(--ok);box-shadow:0 0 0 3px color-mix(in srgb, var(--ok) 18%, transparent)}
.p-search{
  display:flex;align-items:center;gap:7px;font-size:12px;color:var(--site-muted);
  background:var(--site-surface);border:1px solid var(--site-border);border-radius:10px;padding:8px 12px;margin-bottom:12px;
}
.p-search .ic{width:13px;height:13px}
.p-list{display:flex;flex-direction:column;gap:10px;min-height:296px}
.p-card{
  display:flex;align-items:center;gap:11px;text-align:left;width:100%;
  background:var(--site-surface);border:1px solid var(--site-border);border-radius:var(--site-radius);
  padding:12px 13px;cursor:pointer;
  transition:transform var(--dur) ease, border-color var(--dur) ease, box-shadow var(--dur) ease;
}
.p-card:hover{transform:translateY(-2px);border-color:var(--accent-line);box-shadow:0 8px 20px rgba(13,20,36,.08)}
.p-card:active{transform:scale(.98)}
.p-card.copied{border-color:var(--ok);box-shadow:0 0 0 3px color-mix(in srgb, var(--ok) 16%, transparent)}
.p-issuer{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;flex:none;color:#fff}
.p-issuer .ic{width:18px;height:18px}
.p-issuer-gh{background:#1F2733}
.p-issuer-ali{background:linear-gradient(135deg,#FF6A00,#FF9E2C)}
.p-issuer-gg{background:linear-gradient(135deg,#4285F4,#34A853)}
.p-issuer-letter{font-weight:800;font-size:17px}
.p-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}
.p-issuer-name{font-size:12.5px;font-weight:700;line-height:1.3}
.p-account{font-size:10.5px;color:var(--site-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.p-code{font-family:var(--mono);font-size:19px;font-weight:700;letter-spacing:.05em;color:var(--site-accent);line-height:1.2;transition:opacity var(--dur)}
.p-code.tick{animation:codeTick calc(340ms * var(--site-motion,1)) ease}
@keyframes codeTick{0%{opacity:0;transform:translateY(5px)}100%{opacity:1;transform:none}}
.p-ring{width:24px;height:24px;flex:none;transform:rotate(-90deg)}
.p-ring circle{fill:none;stroke-width:2.6;stroke-linecap:round}
.p-ring .ring-bg{stroke:var(--site-border)}
.p-ring .ring-fg{stroke:var(--site-accent);transition:stroke .3s}
.p-ring.low .ring-fg{stroke:var(--flash)}
.p-fab{
  position:absolute;right:18px;bottom:18px;width:42px;height:42px;border-radius:50%;
  display:grid;place-items:center;color:var(--site-on-accent);
  background:linear-gradient(135deg,var(--site-accent),color-mix(in srgb,var(--site-accent) 60%, var(--cyan)));
  box-shadow:0 8px 18px color-mix(in srgb, var(--site-accent) 40%, transparent);
}
.p-fab .ic{width:19px;height:19px}

.mac-chip{
  position:absolute;right:-8px;bottom:52px;z-index:2;
  display:flex;align-items:center;gap:11px;
  background:#101827;color:#F3F5F9;border-radius:14px;padding:11px 15px;
  box-shadow:0 18px 40px rgba(13,20,36,.32);
  border:1px solid rgba(255,255,255,.09);
  transform:rotate(-1.5deg);
  transition:transform var(--dur) ease;
}
.mac-chip.pulse{animation:chipPulse calc(600ms * var(--site-motion,1)) ease}
@keyframes chipPulse{0%{transform:rotate(-1.5deg) scale(1)}35%{transform:rotate(-1.5deg) scale(1.05)}100%{transform:rotate(-1.5deg) scale(1)}}
.mac-chip-icon{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:rgba(255,255,255,.1)}
.mac-chip-icon .ic{width:16px;height:16px}
.mac-chip-body{display:flex;flex-direction:column;line-height:1.3}
.mac-chip-label{font-size:10.5px;opacity:.62}
.mac-chip-code{font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:.06em;color:#7FE3B0}
.mac-chip-kbd{font-family:var(--mono);font-size:11px;padding:4px 7px;border-radius:6px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16)}
.stage-note{margin-top:calc(22px * var(--site-space, 1));font-size:12.5px;color:var(--site-muted)}

/* ---------- 通用 Section ---------- */
.section{padding:var(--sec-pad) 0}
.section-alt{background:var(--site-surface);border-top:1px solid var(--site-border);border-bottom:1px solid var(--site-border)}
.sec-head{margin-bottom:calc(44px * var(--site-space, 1));max-width:44em}
.sec-head-center{margin-left:auto;margin-right:auto;text-align:center}
.sec-tag{
  font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.14em;
  color:var(--site-accent);margin-bottom:12px;text-transform:uppercase;
}
.sec-title-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:12px}
.sec-lead{color:var(--site-muted);font-size:calc(16px * var(--site-type, 1))}
.platform-badge{
  display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;
  color:var(--site-muted);background:var(--site-bg);border:1px solid var(--site-border);
  border-radius:999px;padding:5px 13px;white-space:nowrap;
}
.section-alt .platform-badge{background:var(--site-bg)}
.platform-badge .ic{width:14px;height:14px;color:var(--site-accent)}

/* ---------- 特性网格 ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.feature{
  background:var(--site-surface);border:1px solid var(--site-border);border-radius:var(--site-radius);
  padding:calc(26px * var(--site-space, 1));
  transition:transform var(--dur) ease, box-shadow var(--dur) ease, border-color var(--dur) ease;
}
.feature:hover{transform:translateY(-4px);border-color:var(--accent-line);box-shadow:0 16px 36px rgba(13,20,36,.08)}
.f-icon{
  width:44px;height:44px;border-radius:12px;display:grid;place-items:center;margin-bottom:16px;
  color:var(--site-accent);background:var(--accent-soft);border:1px solid var(--accent-line);
}
.f-icon .ic{width:22px;height:22px}
.f-icon-flash{color:#B26A00;background:color-mix(in srgb, var(--flash) 14%, var(--site-surface));border-color:color-mix(in srgb, var(--flash) 38%, var(--site-border))}
.feature h3{margin-bottom:8px}
.feature p{font-size:14px;color:var(--site-muted)}
.spec-strip{
  display:flex;flex-wrap:wrap;gap:10px;margin-top:calc(30px * var(--site-space, 1));
  padding:calc(18px * var(--site-space, 1)) calc(22px * var(--site-space, 1));
  background:var(--site-surface);border:1px dashed var(--accent-line);border-radius:var(--site-radius);
}
.spec-strip span{
  font-family:var(--mono);font-size:12px;font-weight:600;color:var(--site-muted);
  padding:5px 12px;border-radius:999px;background:var(--site-bg);border:1px solid var(--site-border);
}

/* ---------- Mac 端 ---------- */
.mate-grid{display:grid;grid-template-columns:.92fr 1.08fr;gap:calc(56px * var(--site-space, 1));align-items:center}
.mate-stage{display:flex;flex-direction:column;align-items:center}
.mac-window{width:100%;max-width:400px;filter:drop-shadow(0 26px 50px rgba(13,20,36,.18))}
.mac-menubar{
  display:flex;align-items:center;gap:14px;height:34px;padding:0 14px;
  background:linear-gradient(180deg,#2A3242,#1C2331);color:#E8EBF2;
  border-radius:12px 12px 0 0;font-size:12px;font-weight:600;
}
.mb-apple{width:14px;height:14px}
.mb-left{opacity:.85}
.mb-right{margin-left:auto;display:flex;align-items:center;gap:11px}
.mb-right .ic{width:13px;height:13px}
.mb-mate{color:var(--flash);display:grid;place-items:center;animation:mateGlow 3.2s ease-in-out infinite}
.mb-mate .ic{width:13px;height:13px}
@keyframes mateGlow{0%,100%{filter:drop-shadow(0 0 0 transparent)}50%{filter:drop-shadow(0 0 6px color-mix(in srgb, var(--flash) 80%, transparent))}}
.mb-battery{color:#E8EBF2}
.mb-clock{font-size:11px;opacity:.85;font-weight:500}
.mac-panel{
  position:relative;background:var(--site-surface);border:1px solid var(--site-border);border-top:none;
  border-radius:0 0 14px 14px;padding:14px;margin-left:52px;
}
.mp-head{display:flex;align-items:center;gap:8px;padding:2px 4px 12px}
.mp-logo{width:24px;height:24px;border-radius:7px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--site-accent),color-mix(in srgb,var(--site-accent) 55%, var(--cyan)))}
.mp-logo .ic{width:14px;height:14px}
.mp-name{font-size:13.5px;font-weight:700}
.mp-state{margin-left:auto;display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:600;color:var(--ok)}
.mp-row{
  display:flex;align-items:center;gap:9px;width:100%;text-align:left;
  font-size:12.5px;font-weight:500;padding:9px 10px;border-radius:9px;color:var(--site-fg);
  transition:background var(--dur);
}
.mp-row:hover{background:var(--accent-soft)}
.mp-row .ic{width:15px;height:15px;color:var(--site-muted)}
.mp-pair{justify-content:flex-start}
.mp-pair-code{margin-left:auto;font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:.22em;color:var(--site-accent)}
.mp-copy{width:14px;height:14px;color:var(--site-muted)}
.mp-sep{height:1px;background:var(--site-border);margin:8px 2px}
.mp-label{font-size:10.5px;font-weight:600;letter-spacing:.08em;color:var(--site-muted);padding:2px 10px 6px}
.mp-records{display:flex;flex-direction:column;gap:2px}
.mp-record{
  display:flex;align-items:baseline;gap:10px;width:100%;text-align:left;
  padding:8px 10px;border-radius:9px;transition:background var(--dur);
}
.mp-record:hover{background:var(--accent-soft)}
.mp-record .mono{font-size:13.5px;font-weight:700;letter-spacing:.06em}
.mp-rec-meta{margin-left:auto;font-size:10.5px;color:var(--site-muted)}
.mp-toggle-row .switch{margin-left:auto}
.switch{width:34px;height:20px;border-radius:999px;background:var(--site-border);position:relative;transition:background var(--dur);flex:none}
.switch i{position:absolute;top:2.5px;left:2.5px;width:15px;height:15px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.25);transition:transform var(--dur)}
.switch.on{background:var(--ok)}
.switch.on i{transform:translateX(14px)}
.mp-qr-overlay{
  position:absolute;inset:0;z-index:3;border-radius:0 0 14px 14px;
  background:color-mix(in srgb, var(--site-surface) 96%, transparent);
  backdrop-filter:blur(6px);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;text-align:center;
}
.mp-qr-overlay[hidden]{display:none}
.mp-qr{width:132px;height:132px;background:#fff;padding:8px;border-radius:10px;border:1px solid var(--site-border)}
.mp-qr-overlay p{font-size:12.5px;font-weight:600;line-height:1.5}
.mp-qr-overlay p span{font-size:11px;color:var(--site-muted);font-weight:500}

.mate-copy .sec-head{margin-bottom:calc(28px * var(--site-space, 1))}
.mate-list{list-style:none;display:flex;flex-direction:column;gap:calc(18px * var(--site-space, 1))}
.mate-list li{display:flex;gap:15px;align-items:flex-start}
.m-icon{
  width:40px;height:40px;border-radius:11px;display:grid;place-items:center;flex:none;
  color:var(--site-accent);background:var(--accent-soft);border:1px solid var(--accent-line);
}
.m-icon .ic{width:20px;height:20px}
.mate-list h3{font-size:calc(15.5px * var(--site-type, 1));margin-bottom:2px}
.mate-list p{font-size:13.5px;color:var(--site-muted)}

/* ---------- 协同（深色） ---------- */
.section-dark{background:var(--site-fg);color:var(--site-bg);position:relative;overflow:hidden}
.section-dark::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(600px 340px at 18% 0%, color-mix(in srgb, var(--site-accent) 26%, transparent), transparent 70%),
    radial-gradient(520px 320px at 88% 100%, color-mix(in srgb, var(--cyan) 16%, transparent), transparent 70%);
}
.section-dark .wrap{position:relative}
.section-dark .sec-tag{color:color-mix(in srgb, var(--site-accent) 55%, var(--site-bg))}
.section-dark .sec-lead{color:color-mix(in srgb, var(--site-bg) 68%, transparent)}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap);margin-bottom:calc(44px * var(--site-space, 1))}
.step{
  background:color-mix(in srgb, var(--site-bg) 6%, transparent);
  border:1px solid color-mix(in srgb, var(--site-bg) 14%, transparent);
  border-radius:var(--site-radius);padding:calc(26px * var(--site-space, 1));
  transition:transform var(--dur) ease, border-color var(--dur) ease;
}
.step:hover{transform:translateY(-4px);border-color:color-mix(in srgb, var(--site-accent) 55%, transparent)}
.step-num{
  display:grid;place-items:center;width:34px;height:34px;border-radius:10px;margin-bottom:16px;
  font-family:var(--mono);font-weight:700;font-size:15px;color:var(--site-fg);
  background:linear-gradient(135deg, var(--flash), color-mix(in srgb, var(--flash) 60%, var(--site-bg)));
}
.step h3{margin-bottom:8px;color:var(--site-bg)}
.step p{font-size:13.5px;color:color-mix(in srgb, var(--site-bg) 66%, transparent)}

.sync-demo{
  position:relative;display:flex;align-items:center;gap:calc(20px * var(--site-space, 1));
  background:color-mix(in srgb, var(--site-bg) 5%, transparent);
  border:1px solid color-mix(in srgb, var(--site-bg) 14%, transparent);
  border-radius:var(--site-radius);padding:calc(28px * var(--site-space, 1)) calc(30px * var(--site-space, 1));
}
.sd-node{display:flex;flex-direction:column;align-items:center;gap:6px;min-width:132px}
.sd-icon{width:26px;height:26px;color:color-mix(in srgb, var(--site-bg) 82%, transparent)}
.sd-label{font-size:12px;font-weight:600;color:color-mix(in srgb, var(--site-bg) 64%, transparent)}
.sd-code{
  font-size:19px;font-weight:700;letter-spacing:.08em;padding:7px 15px;border-radius:10px;
  background:color-mix(in srgb, var(--site-bg) 9%, transparent);
  border:1px solid color-mix(in srgb, var(--site-bg) 16%, transparent);
  transition:background var(--dur), border-color var(--dur), color var(--dur);
}
.sd-mac .sd-code{color:color-mix(in srgb, var(--site-bg) 55%, transparent)}
.sd-mac.flash .sd-code{color:#7FE3B0;border-color:color-mix(in srgb, var(--ok) 60%, transparent);background:color-mix(in srgb, var(--ok) 14%, transparent)}
.sd-line{position:relative;flex:1;height:2px;background:color-mix(in srgb, var(--site-bg) 18%, transparent);border-radius:2px;min-width:80px}
.sd-dot{
  position:absolute;top:50%;left:0;width:10px;height:10px;border-radius:50%;
  background:var(--flash);box-shadow:0 0 12px color-mix(in srgb, var(--flash) 80%, transparent);
  transform:translate(-50%,-50%);opacity:0;
}
.sd-dot.run{animation:sdTravel calc(1100ms * var(--site-motion,1)) cubic-bezier(.45,.05,.35,.95) forwards}
@keyframes sdTravel{0%{left:0;opacity:0}12%{opacity:1}88%{opacity:1}100%{left:100%;opacity:0}}
.sd-line-label{
  position:absolute;top:-30px;left:50%;transform:translateX(-50%);white-space:nowrap;
  font-size:11px;color:color-mix(in srgb, var(--site-bg) 52%, transparent);
}
.sd-replay{position:absolute;right:calc(18px * var(--site-space,1));bottom:calc(14px * var(--site-space,1))}
.sd-replay .ic{width:14px;height:14px}
.sync-note{margin-top:calc(22px * var(--site-space, 1));text-align:center;font-size:13px;color:color-mix(in srgb, var(--site-bg) 56%, transparent)}

/* ---------- 安全 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap);margin-bottom:calc(40px * var(--site-space, 1))}
.stat{
  background:var(--site-surface);border:1px solid var(--site-border);border-radius:var(--site-radius);
  padding:calc(26px * var(--site-space, 1));text-align:left;
  transition:transform var(--dur) ease, border-color var(--dur) ease;
}
.stat:hover{transform:translateY(-4px);border-color:var(--accent-line)}
.stat-num{
  display:block;font-size:calc(34px * var(--site-type, 1));font-weight:800;letter-spacing:-.02em;line-height:1.15;
  background:linear-gradient(120deg, var(--site-accent), color-mix(in srgb, var(--site-accent) 45%, var(--cyan)));
  -webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:6px;
}
.stat-num-sm{font-size:calc(21px * var(--site-type, 1));font-family:var(--mono);letter-spacing:0;padding-top:8px}
.stat-label{display:block;font-size:13.5px;font-weight:700;margin-bottom:6px}
.stat p{font-size:12.5px;color:var(--site-muted)}
.sec-cols{display:grid;grid-template-columns:1fr 1fr;gap:var(--gap)}
.sec-col{
  background:var(--site-surface);border:1px solid var(--site-border);border-radius:var(--site-radius);
  padding:calc(30px * var(--site-space, 1));
}
.sec-col h3{display:flex;align-items:center;gap:10px;margin-bottom:18px;font-size:calc(17px * var(--site-type, 1))}
.sec-col h3 .ic{color:var(--site-accent)}
.check-list{list-style:none;display:flex;flex-direction:column;gap:12px}
.check-list li{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--site-muted)}
.check-list .ic{width:17px;height:17px;color:var(--ok);margin-top:3px}

/* ---------- 下载 ---------- */
.dl-grid{display:grid;grid-template-columns:1fr 1fr;gap:var(--gap);max-width:920px;margin:0 auto}
.dl-card{
  display:flex;flex-direction:column;background:var(--site-bg);
  border:1px solid var(--site-border);border-radius:calc(var(--site-radius) + 4px);
  padding:calc(30px * var(--site-space, 1));
  transition:transform var(--dur) ease, box-shadow var(--dur) ease, border-color var(--dur) ease;
}
.dl-card:hover{transform:translateY(-4px);border-color:var(--accent-line);box-shadow:0 20px 44px rgba(13,20,36,.1)}
.dl-head{display:flex;align-items:center;gap:15px;margin-bottom:14px}
.dl-head h3{font-size:calc(19px * var(--site-type, 1));margin-bottom:5px}
.dl-icon{
  width:52px;height:52px;border-radius:14px;display:grid;place-items:center;flex:none;color:#fff;
  background:linear-gradient(135deg,var(--site-accent),color-mix(in srgb,var(--site-accent) 55%, var(--cyan)));
  box-shadow:0 8px 20px color-mix(in srgb, var(--site-accent) 32%, transparent);
}
.dl-icon .ic{width:26px;height:26px}
.dl-icon-mac{background:linear-gradient(135deg,#1F2733,#3A465C);box-shadow:0 8px 20px rgba(13,20,36,.25)}
.dl-desc{font-size:14px;color:var(--site-muted);margin-bottom:12px}
.dl-meta{font-size:12.5px;color:var(--site-muted);margin-bottom:18px}
.dl-alt{display:block;text-align:center;font-size:13px;font-weight:600;color:var(--site-accent);margin-top:12px;transition:opacity var(--dur)}
.dl-alt:hover{opacity:.75;text-decoration:underline}
.dl-notes{margin-top:20px;padding-top:18px;border-top:1px dashed var(--site-border);display:flex;flex-direction:column;gap:9px}
.dl-notes p{font-size:12.5px;color:var(--site-muted);line-height:1.65}
.dl-notes strong{color:var(--site-fg)}
.dl-notes code{font-size:11.5px;background:var(--site-surface);border:1px solid var(--site-border);border-radius:5px;padding:1.5px 6px}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:var(--site-surface);border:1px solid var(--site-border);border-radius:var(--site-radius);
  overflow:hidden;transition:border-color var(--dur);
}
.faq-item[open]{border-color:var(--accent-line)}
.faq-item summary{
  display:flex;align-items:center;justify-content:space-between;gap:14px;cursor:pointer;
  padding:calc(18px * var(--site-space, 1)) calc(22px * var(--site-space, 1));
  font-weight:600;font-size:calc(15px * var(--site-type, 1));list-style:none;
  transition:color var(--dur);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--site-accent)}
.faq-chev{width:18px;height:18px;color:var(--site-muted);transition:transform var(--dur)}
.faq-item[open] .faq-chev{transform:rotate(180deg);color:var(--site-accent)}
.faq-body{padding:0 calc(22px * var(--site-space, 1)) calc(20px * var(--site-space, 1))}
.faq-body p{font-size:14px;color:var(--site-muted)}

/* ---------- Footer ---------- */
.footer{border-top:1px solid var(--site-border);background:var(--site-surface);padding:calc(40px * var(--site-space, 1)) 0}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:18px;text-align:center}
.footer-links{display:flex;gap:26px;flex-wrap:wrap;justify-content:center}
.footer-links a{font-size:13.5px;color:var(--site-muted);transition:color var(--dur)}
.footer-links a:hover{color:var(--site-accent)}
.footer-note{font-size:12.5px;color:var(--site-muted)}
.footer-beian{display:flex;align-items:center;justify-content:center;gap:8px 18px;flex-wrap:wrap;margin-top:-10px;font-size:12px;color:var(--site-muted)}
.footer-beian a{display:inline-flex;align-items:center;gap:6px;color:var(--site-muted);transition:color var(--dur)}
.footer-beian a:hover{color:var(--site-accent)}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:30px;z-index:200;transform:translate(-50%, 16px);
  display:flex;align-items:center;gap:9px;
  background:#101827;color:#F3F5F9;font-size:13.5px;font-weight:600;
  padding:12px 20px;border-radius:12px;border:1px solid rgba(255,255,255,.1);
  box-shadow:0 16px 40px rgba(13,20,36,.35);
  opacity:0;pointer-events:none;transition:opacity var(--dur) ease, transform var(--dur) ease;
  max-width:calc(100vw - 40px);
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast .ic{width:16px;height:16px;color:#7FE3B0}
.toast .mono{letter-spacing:.08em;color:#7FE3B0}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(20px);transition:opacity var(--dur-slow) ease, transform var(--dur-slow) ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1020px){
  .hero-grid{grid-template-columns:1fr;gap:calc(52px * var(--site-space,1))}
  .hero-copy{text-align:center;max-width:640px;margin:0 auto}
  .lead{margin-left:auto;margin-right:auto}
  .hero-cta,.hero-chips{justify-content:center}
  .hero-stage{margin-top:8px}
  .mac-chip{right:2px}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .mate-grid{grid-template-columns:1fr;gap:calc(44px * var(--site-space,1))}
  .mate-stage{order:2}
  .stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  :root{--sec-pad:calc(64px * var(--site-space, 1))}
  .nav-links{
    position:fixed;top:var(--nav-h);left:0;right:0;z-index:99;
    flex-direction:column;align-items:stretch;gap:4px;
    background:var(--site-surface);border-bottom:1px solid var(--site-border);
    padding:14px var(--gap) 18px;
    box-shadow:0 24px 40px rgba(13,20,36,.12);
    display:none;
  }
  .nav-links.open{display:flex}
  .nav-links a:not(.btn){padding:11px 6px;font-size:15px;border-radius:8px}
  .nav-links a:not(.btn).active::after{display:none}
  .nav-links a:not(.btn).active{color:var(--site-accent)}
  .nav-cta{margin:10px 0 0}
  .nav-burger{display:flex}
  .steps{grid-template-columns:1fr}
  .sec-cols{grid-template-columns:1fr}
  .dl-grid{grid-template-columns:1fr}
  .sync-demo{flex-direction:column;gap:26px;padding-bottom:64px}
  .sd-line{width:2px;height:64px;min-width:2px;flex:none}
  .sd-dot.run{animation:sdTravelV calc(1100ms * var(--site-motion,1)) cubic-bezier(.45,.05,.35,.95) forwards}
  .sd-line-label{top:50%;left:22px;transform:translateY(-50%);white-space:normal;width:130px}
  @keyframes sdTravelV{0%{top:0;left:50%;opacity:0}12%{opacity:1}88%{opacity:1}100%{top:100%;left:50%;opacity:0}}
  .sd-replay{right:50%;transform:translateX(50%)}
}
@media (max-width:620px){
  .feature-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr}
  .hero{padding-top:calc(var(--nav-h) + calc(44px * var(--site-space,1)))}
  .phone{width:280px;transform:none}
  .mac-chip{position:static;transform:none;margin-top:18px}
  .mac-chip.pulse{animation:chipPulseFlat calc(600ms * var(--site-motion,1)) ease}
  @keyframes chipPulseFlat{0%{transform:scale(1)}35%{transform:scale(1.04)}100%{transform:scale(1)}}
  .hero-stage{padding-bottom:0}
  .sec-title-row{gap:10px}
  .mac-panel{margin-left:20px}
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  .reveal{opacity:1;transform:none}
}
@media print{
  .reveal{opacity:1;transform:none}
  .nav,.toast{display:none}
}