/* 全站样式：苹果主题令牌 + 共用组件 */
:root {
      
      --bg: #fbfbfd;            
      --tint: #f5f5f7;          
      --panel: #ffffff;         
      --ink: #1d1d1f;           
      --ink-2: #6e6e73;         
      --ink-3: #86868b;         
      --line: #e3e3e6;          
      --line-2: #d2d2d7;        
      --shadow-sm: 0 1px 2px rgba(0, 0, 0, .04), 0 2px 10px rgba(0, 0, 0, .05);
      --shadow-md: 0 1px 3px rgba(0, 0, 0, .05), 0 10px 30px rgba(0, 0, 0, .08);
      --shadow-lg: 0 4px 10px rgba(0, 0, 0, .06), 0 24px 60px rgba(0, 0, 0, .14);
      --ease: cubic-bezier(.32, .72, 0, 1);   
      --motion: 240ms;                         
      --r-lg: 14px;             
      --r-md: 10px;             
      --r-sm: 8px;              
      
      --brand-900: #103c64;
      --brand-700: #1a3a5c;
      --brand-500: #2d5a87;
      --accent-teal: #12a396;   
      --action: var(--brand-700);
      --action-hover: var(--brand-900);
      --link: var(--brand-500);
      --maxw: 1120px;
    }
    @media (prefers-color-scheme: dark) {
      :root {
        
        --bg: #1b1b1f;          
        --tint: #232329;        
        --panel: #2a2a31;       
        --ink: #ececf1;
        --ink-2: #b6b6c2;
        --ink-3: #8a8a97;
        --line: #35353d;
        --line-2: #43434d;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
        --shadow-md: 0 2px 6px rgba(0, 0, 0, .45), 0 8px 24px rgba(0, 0, 0, .35);
        --shadow-lg: 0 4px 14px rgba(0, 0, 0, .5), 0 24px 60px rgba(0, 0, 0, .45);
        
        --action: #3a76b0;
        --action-hover: #4a86c0;
        --link: #60a5fa;
      }
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body {
      margin: 0; background: var(--bg); color: var(--ink);
      
      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
        "Helvetica Neue", "Microsoft YaHei", "微软雅黑", "Hiragino Sans GB", sans-serif;
      font-size: 17px; line-height: 1.5; letter-spacing: .002em;
      -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; }
    code { background: var(--tint); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; font-size: 12.5px; }
    .wrap { width: min(100% - 44px, var(--maxw)); margin: 0 auto; }
    .wrap-narrow { width: min(100% - 44px, 760px); margin: 0 auto; }
    .center { text-align: center; margin-left: auto; margin-right: auto; }

    
    
    h1 { font-size: clamp(25px, 6.6vw, 68px); line-height: 1.08; letter-spacing: -.02em; font-weight: 600; margin: 0 0 20px; }
    h2 { font-size: clamp(30px, 4vw, 54px); line-height: 1.08; letter-spacing: -.015em; font-weight: 600; margin: 0; }
    h3 { font-size: 19px; line-height: 1.35; letter-spacing: -.01em; font-weight: 600; margin: 0 0 10px; }
    p { margin: 0; }
    .sub { font-size: clamp(17px, 1.5vw, 21px); line-height: 1.55; color: var(--ink-2); margin-top: 18px; }
    .muted { color: var(--ink-3); font-size: 13.5px; }
    .mono { font-variant-numeric: tabular-nums; }

    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      border-radius: 980px; border: 1px solid transparent; cursor: pointer;
      font-size: 17px; font-weight: 500; padding: 12px 26px; white-space: nowrap;
      transition: transform var(--motion) var(--ease), background var(--motion) var(--ease),
        border-color var(--motion) var(--ease), opacity var(--motion) var(--ease);
    }
    .btn-primary { background: var(--action); color: #fff; }
    .btn-primary:hover { background: var(--action-hover); }
    .btn-ghost { border-color: var(--line-2); color: var(--ink); background: transparent; }
    .btn-ghost:hover { border-color: var(--ink-3); }
    .btn-link { color: var(--link); padding: 12px 2px; }
    .btn-link::after { content: "›"; margin-left: 7px; font-size: 19px; line-height: 1; }
    .btn:active { transform: scale(.97); }

    
    
    .topbar {
      position: sticky; top: 0; z-index: 60;
      backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
      background: rgba(251, 251, 253, .82); border-bottom: 1px solid rgba(0, 0, 0, .08);
    }
    @media (prefers-color-scheme: dark) {
      .topbar { background: rgba(29, 29, 31, .8); border-bottom-color: rgba(255, 255, 255, .12); }
    }
    .topbar-inner { position: relative; display: flex; align-items: center; gap: 14px; height: 44px; max-width: 1024px; }
    .brand { display: flex; align-items: center; gap: 7px; flex: none; }
    .brand-mark { width: 22px; height: 22px; display: block; }
    .brand-name { font-size: 13px; font-weight: 600; letter-spacing: .01em; }
    .brand-sub { display: none; }
    .nav { display: flex; align-items: center; gap: 24px; margin: 0 auto; font-size: 12px; color: rgba(29, 29, 31, .8); }
    .nav a { transition: color .3s ease; }
    .nav a:hover { color: var(--ink); }
    
    .nav-tools { display: flex; align-items: center; gap: 16px; flex: none; font-size: 12px; color: rgba(29, 29, 31, .8); }
    .nav-tools a { transition: color .3s ease; }
    .nav-tools a:hover { color: var(--ink); }
    .nav-tools svg { display: block; width: 15px; height: 15px; }
    @media (prefers-color-scheme: dark) {
      .nav, .nav-tools { color: rgba(255, 255, 255, .85); }
      .nav a:hover, .nav-tools a:hover { color: #fff; }
    }
    .nav-switch { display: none; }
    .nav-burger { display: none; }

    
    .hero { position: relative; padding: clamp(56px, 9vh, 104px) 0 0; }
    
    .hero::before {
      content: ""; position: absolute; left: 0; right: 0; top: -160px; height: 560px; pointer-events: none;
      background:
        radial-gradient(36% 58% at 22% 24%, rgba(45, 90, 135, .18), transparent 70%),
        radial-gradient(32% 52% at 78% 14%, rgba(18, 163, 150, .16), transparent 72%);
    }
    @media (prefers-color-scheme: dark) {
      .hero::before { opacity: .5; }
    }
    .hero .wrap { position: relative; }
    .hero-copy { text-align: center; max-width: 960px; }
    .hero-sub { font-size: clamp(17px, 1.5vw, 21px); line-height: 1.55; color: var(--ink-2); margin: 20px auto 0; max-width: 660px; }
    .hero-cta { display: flex; align-items: center; justify-content: center; gap: 8px 20px; flex-wrap: wrap; margin-top: 30px; }
    .hero-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px 18px; margin-top: 22px; font-size: 14px; color: var(--ink-3); }
    .hero-links a { color: var(--link); }
    .stage-wrap {
      position: relative; margin-top: clamp(34px, 6vh, 62px); height: clamp(320px, 56vh, 580px);
      border-radius: var(--r-lg); overflow: hidden; background: #04070d;
      
      box-shadow: var(--shadow-lg);
    }
    .stage-wrap::after {
      content: ""; position: absolute; inset: 0; pointer-events: none;
      background: radial-gradient(120% 90% at 50% 0%, rgba(10, 166, 166, .16), transparent 62%);
    }
    .stage-wrap canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: grab; }
    .stage-wrap canvas.dragging { cursor: grabbing; }
    .stage-hint {
      position: absolute; left: 14px; bottom: 12px; z-index: 2; font-size: 11px; color: #9aa7b4;
      background: rgba(0, 0, 0, .45); border: 1px solid rgba(255, 255, 255, .14);
      border-radius: 9px; padding: 5px 10px; backdrop-filter: blur(8px);
    }
    .stage-toggle {
      position: absolute; right: 14px; bottom: 12px; z-index: 2; font-size: 11px; color: #cfe6f2;
      background: rgba(0, 0, 0, .5); border: 1px solid rgba(255, 255, 255, .16);
      border-radius: 9px; padding: 6px 11px; cursor: pointer; font-family: inherit;
    }
    .stage-toggle:hover { border-color: rgba(255, 255, 255, .38); }
    .stage-fallback { position: absolute; inset: 0; display: none; place-content: center; text-align: center; padding: 30px; color: #93a1b0; font-size: 13px; line-height: 2; z-index: 2; }
    .stage-wrap.no-gl .stage-fallback { display: grid; }
    .stage-wrap.no-gl canvas, .stage-wrap.no-gl .stage-hint, .stage-wrap.no-gl .stage-toggle { display: none; }
    
    .stage-wrap.stage-sm { height: clamp(230px, 30vh, 340px); margin-top: clamp(24px, 4vh, 40px); }
    .section.band .stage-wrap.stage-sm { margin-top: clamp(20px, 3vh, 32px); }

    
    .section { padding: clamp(84px, 13vh, 150px) 0; scroll-margin-top: 60px; }
    .section.tinted { background: var(--tint); }
    .section.band { background: #000; color: #f5f5f7; position: relative; overflow: hidden; }
    .section.band::before {
      content: ""; position: absolute; left: 50%; top: -34%; width: 90%; height: 70%;
      transform: translateX(-50%); pointer-events: none;
      background: radial-gradient(50% 50% at 50% 50%, rgba(10, 166, 166, .28), rgba(0, 113, 227, .12) 55%, transparent 72%);
      filter: blur(30px);
    }
    .section.band .wrap { position: relative; }
    .section.band h2 { color: #fff; }
    .section.band .sub { color: #a1a1a6; }
    .section-head { max-width: 760px; }

    .cols3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(24px, 4vw, 52px); margin-top: clamp(36px, 6vh, 64px); }
    .cols3 h3 { font-size: 20px; }
    .cols3 p { font-size: 15px; line-height: 1.65; color: var(--ink-2); }
    .cols3.quiet h3 { font-size: 17px; margin-bottom: 8px; }
    .cols3.quiet p { font-size: 14.5px; }

    
    .rows { display: grid; gap: clamp(56px, 9vh, 104px); margin-top: clamp(40px, 7vh, 76px); }
    .row { display: grid; grid-template-columns: 1.18fr .82fr; gap: clamp(28px, 5vw, 64px); align-items: center; }
    .row.flip { grid-template-columns: .82fr 1.18fr; }
    .row.flip .row-media { order: 2; }
    .row-media { border-radius: var(--r-lg); overflow: hidden; background: var(--panel); box-shadow: var(--shadow-md); }
    .row-media img { display: block; width: 100%; height: auto; }
    .row-copy h3 { font-size: clamp(21px, 2.1vw, 27px); letter-spacing: -.012em; margin-bottom: 12px; }
    .row-copy p { font-size: 16px; line-height: 1.64; color: var(--ink-2); }
    .row-copy .link { display: inline-block; margin-top: 14px; font-size: 16px; color: var(--link); }
    .row-copy .link::after { content: "›"; margin-left: 6px; }

    
    .plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: clamp(34px, 6vh, 60px); align-items: stretch; }
    .plan { position: relative; display: flex; flex-direction: column; background: var(--panel); border: 0; border-radius: var(--r-md); padding: 26px 22px 24px; }
    .plan.hot { box-shadow: var(--shadow-lg); }
    .plan.hot::after {
      content: "推荐"; position: absolute; top: 18px; right: 18px; font-size: 11px; font-weight: 600;
      color: #fff; background: var(--action); border-radius: 999px; padding: 3px 9px;
    }
    .plan-label { font-size: 20px; font-weight: 700; letter-spacing: -.01em; }
    .plan-audience { font-size: 12.5px; color: var(--link); margin: 6px 0 8px; }
    .plan-price { font-size: 30px; font-weight: 700; letter-spacing: -.02em; margin: 14px 0 2px; }
    .plan-price small { display: block; font-size: 12px; font-weight: 400; color: var(--ink-3); margin-top: 4px; letter-spacing: 0; }
    .plan-note { font-size: 12px; color: var(--ink-3); margin-top: 6px; }
    .plan ul { list-style: none; margin: 18px 0 0; padding: 0; font-size: 13.5px; }
    .plan li { position: relative; padding: 6px 0 6px 22px; color: var(--ink-2); line-height: 1.5; }
    .plan li::before { content: "✓"; position: absolute; left: 0; color: var(--accent-teal); font-weight: 600; }
    .plan li.off { color: var(--ink-3); }
    .plan li.off::before { content: "—"; color: var(--ink-3); font-weight: 400; }
    .plan-cta { margin-top: auto; padding-top: 20px; }
    .plan-cta .btn { width: 100%; font-size: 14px; padding: 10px 14px; }
    .fineprint { font-size: 12.5px; line-height: 1.72; color: var(--ink-3); max-width: 780px; margin: 26px auto 0; }
    .fineprint b { color: var(--ink-2); font-weight: 600; }

    
    .faq { margin-top: clamp(28px, 5vh, 48px); }
    .faq details { border-bottom: 1px solid var(--line); }
    .faq details:first-child { border-top: 1px solid var(--line); }
    .faq summary {
      display: flex; align-items: center; justify-content: space-between; gap: 18px; cursor: pointer;
      list-style: none; padding: 24px 2px; font-size: clamp(17px, 1.8vw, 21px); font-weight: 600; letter-spacing: -.01em;
    }
    .faq summary::-webkit-details-marker { display: none; }
    .faq summary::after { content: "＋"; font-size: 19px; font-weight: 400; color: var(--ink-3); transition: transform .22s ease; }
    .faq details[open] summary::after { content: "－"; }
    .faq p { padding: 0 2px 26px; font-size: 15.5px; line-height: 1.72; color: var(--ink-2); max-width: 820px; }

    
    .card { background: var(--panel); border: 0; border-radius: var(--r-md); padding: 26px; margin-top: 18px; }
    .contact-line { display: flex; gap: 12px; align-items: baseline; font-size: 15px; padding: 7px 0; }
    .contact-line b { min-width: 62px; font-size: 13px; font-weight: 500; color: var(--ink-3); }
    .contact-line span { word-break: break-all; }
    #contactCard h3 { font-size: 19px; }
    #contactCard p { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
    #contactCard .contact-line { margin: 0; }
    .qr-box { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; margin-top: 14px; }
    .qr-box img { width: 132px; height: 132px; object-fit: contain; border-radius: 14px; background: #fff; padding: 6px; border: 1px solid var(--line); }
    .lead { margin-top: 18px; background: var(--panel); border: 0; border-radius: var(--r-md); padding: 0 26px; }
    .lead summary {
      display: flex; align-items: center; justify-content: space-between; gap: 16px;
      cursor: pointer; list-style: none; padding: 22px 2px; font-size: 16px; font-weight: 600;
    }
    .lead summary::-webkit-details-marker { display: none; }
    .lead summary::after { content: "＋"; color: var(--ink-3); font-weight: 400; }
    .lead[open] summary::after { content: "－"; }
    .lead-body { padding-bottom: 24px; }
    .lead-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; margin: 6px 0 16px; }
    .lead-form label { display: flex; flex-direction: column; gap: 7px; font-size: 13px; color: var(--ink-3); }
    .lead-form label.wide { grid-column: 1 / -1; }
    .lead-form input, .lead-form select, .lead-form textarea, #leadText {
      width: 100%; padding: 11px 13px; border-radius: 12px; font: inherit; font-size: 14px;
      background: var(--panel); border: 1px solid var(--line-2); color: inherit;
    }
    .lead-form input:focus, .lead-form select:focus, .lead-form textarea:focus, #leadText:focus { outline: 2px solid var(--action); outline-offset: 1px; }
    #leadText { margin-top: 12px; line-height: 1.7; resize: vertical; }
    .lead-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
    .lead-actions .btn { font-size: 14px; padding: 10px 18px; }

    
    .announcement { background: var(--panel); border-bottom: 1px solid var(--line); text-align: center; font-size: 13px; color: var(--ink-2); padding: 10px 20px; }
    .announce-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--action); margin-right: 8px; vertical-align: 1px; }
    .changelog-item { padding: 12px 0; border-top: 1px solid var(--line); }
    .changelog-item:first-child { border-top: 0; padding-top: 0; }
    .changelog-head { display: flex; gap: 10px; align-items: baseline; font-size: 15px; }
    .changelog-item ul { margin: 8px 0 0; padding-left: 18px; font-size: 13.5px; line-height: 1.65; color: var(--ink-2); }
    
    .logcard { padding: 0 26px; }
    .logcard > summary {
      display: flex; align-items: center; justify-content: space-between; gap: 16px;
      cursor: pointer; list-style: none; padding: 22px 2px; font-size: 16px; font-weight: 600;
    }
    .logcard > summary::-webkit-details-marker { display: none; }
    .logcard > summary::after { content: "＋"; color: var(--ink-3); font-weight: 400; }
    .logcard[open] > summary::after { content: "－"; }
    .logcard > div:last-child { padding-bottom: 18px; }
    footer { border-top: 1px solid var(--line); padding: 40px 0 56px; font-size: 12.5px; line-height: 1.8; color: var(--ink-3); }
    footer .wrap { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
    .honesty { color: var(--ink-3); }

    @media (max-width: 1080px) {
      .nav { gap: 14px; font-size: 12px; }
      .plans { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 900px) {
      .nav { display: none; }
      .nav-burger { display: flex; flex-direction: column; justify-content: center; gap: 5px; margin-left: auto; padding: 10px 2px; cursor: pointer; }
      .nav-burger span { display: block; width: 18px; height: 1.5px; background: var(--ink); border-radius: 2px; }
      .nav-switch:checked ~ .nav {
        display: flex; position: absolute; left: -22px; right: -22px; top: 52px;
        flex-direction: column; align-items: stretch; gap: 0; margin: 0;
        background: var(--bg); border-bottom: 1px solid var(--line); padding: 6px 22px 16px;
      }
      .nav-switch:checked ~ .nav a { padding: 13px 0; font-size: 16px; border-bottom: 1px solid var(--line); color: var(--ink); }
      .row, .row.flip { grid-template-columns: 1fr; gap: 24px; }
      .row.flip .row-media { order: 0; }
    }
    @media (max-width: 720px) {
      .cols3 { grid-template-columns: 1fr; gap: 28px; }
      .plans { grid-template-columns: 1fr; }
      .lead-form { grid-template-columns: 1fr; }
      .hero-cta .btn { width: 100%; }
      .stage-wrap { height: 46vh; min-height: 300px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      * { transition: none !important; }
    }


    
    
    .nav a.current { color: var(--ink); font-weight: 600; }

    
    .page-head { padding: clamp(52px, 9vh, 104px) 0 0; }
    .page-head h1 { font-size: clamp(30px, 4.4vw, 54px); margin-bottom: 16px; }
    .page-wrap { padding: 40px 0 90px; }
    .page-wrap h1 { font-size: clamp(28px, 4.2vw, 48px); margin: 0 0 12px; }
    .page-wrap .lead { color: var(--ink-2); font-size: 16px; line-height: 1.72; max-width: 62em; margin: 0 0 22px; }
    
    .page-wrap a { color: var(--link); }
    .page-wrap a:hover { text-decoration: underline; }

    
    .tiles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: clamp(30px, 5vh, 52px); }
    .tile-card {
      display: flex; flex-direction: column; align-items: center; justify-content: center;
      min-height: clamp(280px, 38vh, 380px); text-align: center;
      background: var(--panel); border-radius: 18px; padding: 40px 32px;
      transition: transform .3s var(--ease);
    }
    .tile-card:hover { transform: scale(1.004); }
    .tile-card h3 { font-size: clamp(24px, 2.6vw, 34px); letter-spacing: -.02em; margin-bottom: 12px; }
    .tile-card p { font-size: 16px; line-height: 1.5; color: var(--ink-2); max-width: 24em; margin: 0 auto; }
    .tile-links { display: flex; gap: 22px; justify-content: center; margin-top: 20px; font-size: 15px; }
    .tile-links .link { color: var(--link); }
    .tile-links .link::after { content: "›"; margin-left: 5px; }
    
    .tile-card.dark { background: linear-gradient(160deg, #0b2033 0%, #061423 62%, #04101c 100%); }
    .tile-card.dark h3 { color: #f5f5f7; }
    .tile-card.dark p { color: #a1a1a6; }
    .tile-card.dark .tile-links .link { color: #6cb8f6; }
    .tile-card.tint { background: var(--tint); }

    
    :root {
      --bg-2: var(--panel);
      --muted: var(--ink-2);
      --glass: rgba(255, 255, 255, .78);
      --radius: var(--r-lg);
      --teal: var(--accent-teal);
      --cyan: var(--link);
      --blue: var(--brand-700);
      --amber: #b26a00;
    }
    @media (prefers-color-scheme: dark) {
      :root { --glass: rgba(35, 35, 41, .82); --amber: #e0a63c; }
    }
    @media (max-width: 900px) {
      .tiles { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 620px) {
      .tiles { grid-template-columns: 1fr; }
    }