/* ===========================================================
   软天空 · ruan-tiankong.cn 落地页样式
   风格：清爽科技蓝 / 柔光玻璃卡片
   浅蓝底 + 大圆角 + 柔和投影 + 渐变强调色（无粗描边、无硬投影）
   =========================================================== */

/* ===== 1. 设计变量 ===== */
:root{
  --bg:#F2F7FD;
  --surface:#FFFFFF;
  --ink:#0F2740;
  --ink-2:#4A6480;
  --ink-3:#8496AB;

  --blue:#2FA8DE;
  --blue-deep:#1B7FB4;
  --blue-ink:#0E5F8C;
  --cyan:#2ED3DE;
  --violet:#7C6BFF;
  --mint:#22C79B;
  --amber:#FFB43D;
  --orange:#FF8A4C;
  --rose:#FF6E8A;

  --grad-blue:linear-gradient(135deg,#6FD0F5 0%,#2FA8DE 55%,#1478B8 100%);
  --grad-cyan:linear-gradient(135deg,#7BE9EE 0%,#2ED3DE 55%,#12A9BC 100%);
  --grad-violet:linear-gradient(135deg,#A99BFF 0%,#7C6BFF 55%,#5A46E0 100%);
  --grad-mint:linear-gradient(135deg,#79EBC7 0%,#22C79B 55%,#0F9E78 100%);
  --grad-amber:linear-gradient(135deg,#FFD582 0%,#FFB43D 55%,#E08A0C 100%);
  --grad-rose:linear-gradient(135deg,#FFA9BA 0%,#FF6E8A 55%,#E2415F 100%);
  --grad-band:linear-gradient(135deg,#12345A 0%,#0E2647 55%,#141E44 100%);
  --text-grad:linear-gradient(96deg,#2FA8DE 0%,#38C8D8 45%,#7C6BFF 100%);

  --radius:16px;
  --radius-lg:22px;
  --radius-xl:28px;
  --line:1px solid rgba(28,84,132,.12);
  --line-2:1px solid rgba(28,84,132,.18);
  --shadow-sm:0 4px 14px -6px rgba(16,58,102,.22);
  --shadow:0 14px 32px -20px rgba(16,58,102,.38);
  --shadow-lg:0 28px 60px -32px rgba(16,58,102,.45);
  --shadow-blue:0 16px 34px -16px rgba(47,168,222,.55);
  color-scheme:light;
}

/* ===== 2. 基础重置 ===== */
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  background-color:var(--bg);
  background-image:
    radial-gradient(900px 460px at 88% -6%, rgba(47,168,222,.20), transparent 62%),
    radial-gradient(760px 420px at 4% 4%, rgba(124,107,255,.15), transparent 60%),
    radial-gradient(820px 520px at 50% 104%, rgba(46,211,222,.18), transparent 62%);
  background-attachment:fixed;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(28,84,132,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28,84,132,.045) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(1000px 700px at 50% 0%, #000, transparent 88%);
  -webkit-mask-image:radial-gradient(1000px 700px at 50% 0%, #000, transparent 88%);
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;cursor:pointer;background:none;border:0;}
h1,h2,h3,h4,p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
figure,figcaption{margin:0;}
svg{width:1.15em;height:1.15em;flex:none;}
:focus-visible{outline:3px solid rgba(47,168,222,.55);outline-offset:3px;border-radius:10px;}
::selection{background:rgba(47,168,222,.22);}

/* ===== 3. 布局 ===== */
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 24px;position:relative;z-index:1;}
.section{padding:76px 0;position:relative;z-index:1;}
.pb-0{padding-bottom:0;}
.pt-0{padding-top:0;}

.section-head{max-width:680px;margin:0 auto 44px;text-align:center;}
.section-title{
  font-size:clamp(1.75rem,4vw,2.5rem);
  font-weight:800;letter-spacing:-.03em;line-height:1.24;
}
.section-sub{color:var(--ink-2);font-size:1.02rem;margin-top:12px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 15px;border-radius:999px;margin-bottom:16px;
  font-size:.76rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;
  color:var(--blue-ink);background:rgba(47,168,222,.12);
  border:1px solid rgba(47,168,222,.3);
}
.eyebrow::before{
  content:"";width:7px;height:7px;border-radius:50%;background:var(--blue);
  box-shadow:0 0 0 4px rgba(47,168,222,.18);
}
.eyebrow-light{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.32);color:#fff;}
.eyebrow-light::before{background:#7BE9EE;box-shadow:0 0 0 4px rgba(123,233,238,.22);}
.grad-text{
  background:var(--text-grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}

/* ===== 4. 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 26px;border-radius:999px;font-weight:800;font-size:.98rem;
  white-space:nowrap;position:relative;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease;
}
.btn svg{width:1.15em;height:1.15em;stroke-width:2.4;}
.btn-sm{padding:9px 20px;font-size:.9rem;}
.btn-lg{padding:15px 34px;font-size:1.04rem;}
.btn-primary{background:var(--grad-blue);color:#fff;box-shadow:var(--shadow-blue);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 20px 40px -16px rgba(47,168,222,.68);}
.btn-primary:active{transform:translateY(0);box-shadow:0 8px 20px -12px rgba(47,168,222,.6);}
.btn-ghost{background:#fff;color:var(--ink);border:var(--line-2);box-shadow:var(--shadow-sm);}
.btn-ghost:hover{transform:translateY(-2px);color:var(--blue-ink);box-shadow:var(--shadow);}
.btn-green{background:var(--grad-mint);color:#fff;box-shadow:0 16px 34px -16px rgba(34,199,155,.6);}
.btn-green:hover{transform:translateY(-2px);box-shadow:0 20px 40px -16px rgba(34,199,155,.72);}

/* ===== 5. 顶部导航 ===== */
.header{
  position:sticky;top:0;z-index:60;
  background:rgba(242,247,253,.72);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(28,84,132,.08);
  transition:background .24s ease,box-shadow .24s ease;
}
.header.is-scrolled{background:rgba(255,255,255,.86);box-shadow:0 10px 30px -22px rgba(16,58,102,.5);}
.nav{display:flex;align-items:center;gap:24px;height:72px;}
.logo{display:inline-flex;align-items:center;gap:11px;font-weight:800;font-size:1.14rem;letter-spacing:-.02em;}
.logo-img{
  width:42px;height:42px;border-radius:13px;flex:none;overflow:hidden;
  box-shadow:0 8px 18px -8px rgba(47,168,222,.7);
}
.logo-img img{width:100%;height:100%;object-fit:cover;}
.logo small{
  display:block;font-size:.58rem;letter-spacing:.2em;font-weight:700;
  color:var(--ink-3);line-height:1.2;text-transform:uppercase;
}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:.95rem;font-weight:700;}
.nav-links a{color:var(--ink-2);position:relative;padding:6px 0;transition:color .18s ease;}
.nav-links a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;border-radius:2px;
  background:var(--grad-blue);transition:right .24s ease;
}
.nav-links a:hover{color:var(--blue-ink);}
.nav-links a:hover::after{right:0;}
.nav-cta{display:flex;align-items:center;gap:12px;}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:13px;position:relative;
  background:#fff;border:var(--line-2);box-shadow:var(--shadow-sm);
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:50%;width:17px;height:2px;border-radius:2px;
  background:var(--ink);transform:translateX(-50%);transition:transform .22s ease;
}
.nav-toggle span{top:50%;margin-top:-1px;}
.nav-toggle span::before{content:"";top:-6px;left:0;transform:none;}
.nav-toggle span::after{content:"";top:6px;left:0;transform:none;}

.mobile-menu{
  position:fixed;left:0;right:0;top:72px;z-index:55;
  display:grid;gap:2px;padding:16px 20px 22px;
  background:rgba(255,255,255,.97);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(28,84,132,.1);
  box-shadow:0 24px 40px -28px rgba(16,58,102,.5);
  transform:translateY(-14px);opacity:0;visibility:hidden;
  transition:transform .24s ease,opacity .24s ease,visibility .24s ease;
}
.mobile-menu.is-open{transform:none;opacity:1;visibility:visible;}
.mobile-menu a{
  padding:12px 6px;font-weight:700;font-size:.98rem;color:var(--ink-2);
  border-bottom:1px solid rgba(28,84,132,.08);transition:color .16s ease;
}
.mobile-menu a:hover{color:var(--blue-ink);}
.mobile-menu .btn{margin-top:14px;}

/* ===== 6. 首屏 ===== */
.hero{padding:56px 0 80px;position:relative;overflow:hidden;}
.hero-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:46px;align-items:center;}
.hero-title{
  font-size:clamp(2.05rem,4.7vw,3.05rem);
  font-weight:800;line-height:1.2;letter-spacing:-.035em;margin:18px 0 16px;
}
.hero-sub{color:var(--ink-2);font-size:1.05rem;max-width:34em;}
.hero-slogan{
  display:inline-flex;align-items:center;gap:8px;margin-top:18px;
  padding:8px 18px;border-radius:999px;font-weight:800;font-size:.88rem;
  color:var(--blue-ink);background:#fff;border:1px solid rgba(47,168,222,.28);
  box-shadow:0 8px 20px -14px rgba(47,168,222,.7);
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px;}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px;}
.hero-tags li{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 15px;border-radius:999px;font-size:.84rem;font-weight:700;color:var(--ink-2);
  background:rgba(255,255,255,.8);border:var(--line);
}
.hero-tags li::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--blue);}
.hero-tags li:nth-child(2)::before{background:var(--violet);}
.hero-tags li:nth-child(3)::before{background:var(--mint);}
.hero-tags li:nth-child(4)::before{background:var(--amber);}

/* 手机预览 */
.hero-visual{position:relative;display:grid;place-items:center;padding:10px 0 0;}
.hero-visual::before{
  content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:min(520px,94%);height:88%;border-radius:50%;
  background:radial-gradient(closest-side, rgba(47,168,222,.28), transparent 74%);
  filter:blur(6px);pointer-events:none;
}
.phone{
  position:relative;z-index:1;width:min(312px,74vw);padding:10px;border-radius:42px;
  background:linear-gradient(160deg,#1B4166 0%,#0C2137 100%);
  box-shadow:0 44px 74px -36px rgba(10,42,76,.66), 0 0 0 1px rgba(255,255,255,.07) inset;
}
.phone::after{
  content:"";position:absolute;left:50%;top:16px;transform:translateX(-50%);
  width:74px;height:6px;border-radius:6px;background:rgba(255,255,255,.22);z-index:3;
}
.phone-screen{
  position:relative;border-radius:33px;overflow:hidden;aspect-ratio:9/16;background:#E9F2FC;
}
.slides-track{position:absolute;inset:0;}
.slides-track img{
  position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;object-position:top center;
  opacity:0;transition:opacity .5s ease;
}
.slides-track img.is-active{opacity:1;}
.slide-badge{
  position:absolute;right:-12px;top:26px;z-index:4;
  padding:9px 14px;border-radius:14px;text-align:center;
  font-weight:800;font-size:.78rem;line-height:1.25;color:#fff;
  background:var(--grad-violet);box-shadow:0 14px 26px -14px rgba(124,107,255,.8);
  transform:rotate(4deg);
}
.hud-chip{
  position:absolute;z-index:2;display:flex;align-items:center;gap:7px;
  padding:8px 13px;border-radius:12px;font-size:.76rem;font-weight:700;color:var(--ink);
  background:rgba(255,255,255,.94);border:var(--line);
  box-shadow:0 12px 26px -16px rgba(16,58,102,.6);
}
.hud-chip .dot{width:7px;height:7px;border-radius:50%;background:var(--mint);}
.hud-chip b{font-weight:900;color:var(--blue-ink);}
.chip-a{left:-14px;top:16%;}
.chip-a .dot{background:var(--mint);}
.chip-b{right:-16px;top:48%;}
.chip-b .dot{background:var(--amber);}
.chip-c{left:-8px;bottom:16%;}
.chip-c .dot{background:var(--violet);}

.dots{display:flex;justify-content:center;gap:9px;margin-top:22px;}
.dots button{
  width:9px;height:9px;padding:0;border-radius:999px;background:rgba(28,84,132,.22);
  transition:width .24s ease,background .24s ease;
}
.dots button.is-active{width:26px;background:var(--grad-blue);}
.dots-hint{text-align:center;margin-top:12px;font-size:.83rem;font-weight:700;color:var(--ink-3);}

/* ===== 7. 亮点条 ===== */
.stat-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.stat-item{
  padding:24px 20px;border-radius:var(--radius-lg);text-align:center;
  background:rgba(255,255,255,.86);border:var(--line);box-shadow:var(--shadow);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  transition:transform .2s ease,box-shadow .2s ease;
}
.stat-item:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);}
.stat-item .s-tag{
  display:inline-block;padding:4px 12px;border-radius:999px;margin-bottom:10px;
  font-size:.7rem;font-weight:800;letter-spacing:.08em;
  color:var(--blue-ink);background:rgba(47,168,222,.12);
}
.stat-item:nth-child(2) .s-tag{color:#5A46E0;background:rgba(124,107,255,.13);}
.stat-item:nth-child(3) .s-tag{color:#0F9E78;background:rgba(34,199,155,.13);}
.stat-item:nth-child(4) .s-tag{color:#B5760A;background:rgba(255,180,61,.16);}
.stat-item .s-name{font-weight:800;font-size:1.06rem;letter-spacing:-.01em;}
.stat-item .s-desc{color:var(--ink-2);font-size:.85rem;margin-top:5px;}

/* ===== 8. 功能卡片 ===== */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.card{
  position:relative;padding:28px 26px;border-radius:var(--radius-xl);
  background:rgba(255,255,255,.88);border:var(--line);box-shadow:var(--shadow);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  transition:transform .2s ease,box-shadow .2s ease;
}
.card::after{
  content:"";position:absolute;left:26px;right:26px;top:0;height:3px;border-radius:0 0 4px 4px;
  background:var(--grad-blue);opacity:0;transition:opacity .2s ease;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);}
.card:hover::after{opacity:1;}
.card-icon{
  width:52px;height:52px;border-radius:16px;display:grid;place-items:center;
  background:var(--grad-blue);color:#fff;margin-bottom:16px;
  box-shadow:0 14px 26px -14px rgba(47,168,222,.85);
}
.card-icon svg{width:25px;height:25px;}
.card-icon.tone-cyan{background:var(--grad-cyan);box-shadow:0 14px 26px -14px rgba(46,211,222,.85);}
.card-icon.tone-violet{background:var(--grad-violet);box-shadow:0 14px 26px -14px rgba(124,107,255,.85);}
.card-icon.tone-mint{background:var(--grad-mint);box-shadow:0 14px 26px -14px rgba(34,199,155,.85);}
.card-icon.tone-amber{background:var(--grad-amber);box-shadow:0 14px 26px -14px rgba(255,180,61,.9);}
.card-icon.tone-rose{background:var(--grad-rose);box-shadow:0 14px 26px -14px rgba(255,110,138,.85);}
.card-title{font-size:1.1rem;font-weight:800;letter-spacing:-.015em;margin-bottom:8px;}
.card-desc{color:var(--ink-2);font-size:.93rem;}
.card-desc a{color:var(--blue-ink);font-weight:700;border-bottom:1px solid rgba(47,168,222,.4);}
.card-desc a:hover{border-bottom-color:var(--blue-ink);}

/* ===== 9. 深色版块带 ===== */
.band{
  position:relative;overflow:hidden;padding:50px 46px;border-radius:var(--radius-xl);
  background:var(--grad-band);color:#fff;
  box-shadow:0 34px 70px -34px rgba(10,38,70,.7);
}
.band::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    radial-gradient(520px 300px at 88% 6%, rgba(47,168,222,.34), transparent 66%),
    radial-gradient(420px 260px at 6% 96%, rgba(124,107,255,.26), transparent 66%);
}
.band-grid{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start;}
.band-title{font-size:clamp(1.5rem,3.2vw,2.05rem);font-weight:800;letter-spacing:-.03em;margin:16px 0 12px;}
.band-sub{color:rgba(255,255,255,.76);font-size:.98rem;}
.band-list{display:grid;gap:12px;}
.band-list li{
  display:flex;gap:14px;align-items:flex-start;
  padding:14px 16px;border-radius:var(--radius);
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);
  transition:transform .18s ease,background .18s ease;
}
.band-list li:hover{transform:translateX(4px);background:rgba(255,255,255,.13);}
.band-list .b-icon{
  width:34px;height:34px;flex:none;border-radius:11px;display:grid;place-items:center;
  font-weight:900;font-size:.78rem;
  background:var(--grad-blue);color:#fff;
}
.band-list li:nth-child(2) .b-icon{background:var(--grad-violet);}
.band-list li:nth-child(3) .b-icon{background:var(--grad-mint);}
.band-list li:nth-child(4) .b-icon{background:var(--grad-amber);}
.band-list b{display:block;font-size:1.01rem;font-weight:800;}
.band-list small{display:block;color:rgba(255,255,255,.74);font-size:.86rem;}
.band-note{
  margin-top:18px;padding:13px 16px;border-radius:var(--radius);
  font-size:.88rem;color:rgba(255,255,255,.86);
  background:rgba(123,233,238,.12);border:1px dashed rgba(123,233,238,.44);
}
.band-note a{color:#BDF3F7;font-weight:800;text-decoration:underline;}

/* ===== 10. 截图画廊 ===== */
.shots{
  display:flex;gap:20px;max-width:none;margin:0;
  overflow-x:auto;overflow-y:hidden;overscroll-behavior-x:contain;
  scroll-snap-type:x mandatory;
  padding:10px 4px 30px;
  scrollbar-width:none;-ms-overflow-style:none;
}
.shots::-webkit-scrollbar{display:none;}
.shots.is-dragging{cursor:grabbing;scroll-snap-type:none;}
.shot{
  flex:0 0 330px;scroll-snap-align:center;
  display:flex;flex-direction:column;border-radius:var(--radius-lg);overflow:hidden;
  background:#fff;border:var(--line);box-shadow:var(--shadow);
  transition:transform .2s ease,box-shadow .2s ease;
}
.shot:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);}
.shot-screen{position:relative;background:#E9F2FC;aspect-ratio:9/16;overflow:hidden;}
.shot-screen img{width:100%;height:100%;object-fit:cover;object-position:top center;}
.shot-tag{
  position:absolute;left:9px;top:9px;z-index:2;
  padding:4px 11px;border-radius:999px;font-size:.7rem;font-weight:800;
  color:#fff;background:rgba(15,39,64,.6);
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}
.shot-meta{padding:14px 14px 16px;border-top:var(--line);}
.shot-meta h3{font-size:.95rem;font-weight:800;letter-spacing:-.01em;margin-bottom:5px;}
.shot-meta p{color:var(--ink-2);font-size:.82rem;line-height:1.65;}
.shots-nav{display:flex;align-items:center;justify-content:center;gap:18px;margin-top:22px;}
.shots-arrow{
  width:44px;height:44px;padding:0;border-radius:14px;font-size:1.3rem;font-weight:800;line-height:1;
  background:#fff;border:var(--line-2);box-shadow:var(--shadow-sm);color:var(--blue-ink);
  display:grid;place-items:center;cursor:pointer;transition:background .18s ease,transform .18s ease;
}
.shots-arrow:hover{background:rgba(47,168,222,.1);transform:translateY(-2px);}
.shots-arrow[disabled]{opacity:.35;cursor:default;transform:none;}
.shots-dots{display:flex;gap:8px;}
.shots-dots button{width:9px;height:9px;padding:0;border-radius:999px;background:rgba(28,84,132,.22);transition:width .24s ease,background .24s ease;}
.shots-dots button.is-active{width:24px;background:var(--grad-blue);}
.shots-hint{display:block;text-align:center;margin-top:12px;font-size:.84rem;font-weight:700;color:var(--ink-3);}

/* ===== 11. 上手步骤 ===== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.step{
  position:relative;padding:26px 22px;border-radius:var(--radius-xl);
  background:rgba(255,255,255,.88);border:var(--line);box-shadow:var(--shadow);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
}
.step-num{
  display:inline-grid;place-items:center;width:44px;height:44px;border-radius:14px;
  font-weight:900;font-size:.92rem;color:#fff;background:var(--grad-blue);
  box-shadow:0 14px 26px -14px rgba(47,168,222,.85);margin-bottom:14px;
}
.step:nth-child(2) .step-num{background:var(--grad-cyan);box-shadow:0 14px 26px -14px rgba(46,211,222,.85);}
.step:nth-child(3) .step-num{background:var(--grad-violet);box-shadow:0 14px 26px -14px rgba(124,107,255,.85);}
.step:nth-child(4) .step-num{background:var(--grad-mint);box-shadow:0 14px 26px -14px rgba(34,199,155,.85);}
.step h3{font-size:1.04rem;font-weight:800;margin-bottom:8px;}
.step p{color:var(--ink-2);font-size:.9rem;}
.step a{color:var(--blue-ink);font-weight:700;border-bottom:1px solid rgba(47,168,222,.4);}
.step a:hover{border-bottom-color:var(--blue-ink);}

/* ===== 12. 常见问题 ===== */
.faq{max-width:880px;margin:0 auto;display:grid;gap:12px;}
.faq-item{
  border-radius:var(--radius-lg);background:rgba(255,255,255,.88);
  border:var(--line);box-shadow:var(--shadow-sm);overflow:hidden;
  transition:box-shadow .2s ease;
}
.faq-item.is-open{box-shadow:var(--shadow);}
.faq-q{
  width:100%;display:flex;align-items:center;gap:14px;
  padding:20px 24px;text-align:left;font-weight:800;font-size:1rem;letter-spacing:-.01em;
}
.faq-q .icon{
  margin-left:auto;flex:none;position:relative;width:26px;height:26px;border-radius:9px;
  background:rgba(47,168,222,.12);
}
.faq-q .icon::before,.faq-q .icon::after{
  content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  background:var(--blue-ink);border-radius:2px;transition:transform .22s ease,opacity .22s ease;
}
.faq-q .icon::before{width:12px;height:2px;}
.faq-q .icon::after{width:2px;height:12px;}
.faq-item.is-open .faq-q .icon::after{transform:translate(-50%,-50%) scaleY(0);opacity:0;}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .28s ease;}
.faq-item.is-open .faq-a{grid-template-rows:1fr;}
.faq-a-inner{overflow:hidden;}
.faq-a-inner p{padding:0 24px 22px;color:var(--ink-2);font-size:.95rem;max-width:60em;}
.faq-a-inner a{color:var(--blue-ink);font-weight:700;border-bottom:1px solid rgba(47,168,222,.4);}

/* ===== 13. 关于本站 ===== */
.about{
  padding:42px 40px;border-radius:var(--radius-xl);
  background:rgba(255,255,255,.88);border:var(--line);box-shadow:var(--shadow);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  display:grid;grid-template-columns:1.3fr .9fr;gap:36px;align-items:center;
}
.about h2{font-size:1.5rem;font-weight:800;letter-spacing:-.025em;margin-bottom:18px;}
.about-grid{display:grid;grid-template-columns:1fr;gap:14px;}
.about-grid p{color:var(--ink-2);font-size:.95rem;}
.about-grid a{color:var(--blue-ink);font-weight:700;border-bottom:1px solid rgba(47,168,222,.4);}
.about-art{
  margin:0;border-radius:var(--radius-lg);overflow:hidden;
  border:var(--line);box-shadow:var(--shadow);
}
.about-art img{display:block;width:100%;height:auto;}

/* ===== 14. 下载 CTA ===== */
.cta-band{
  position:relative;overflow:hidden;padding:54px 40px;text-align:center;
  border-radius:var(--radius-xl);background:var(--grad-band);color:#fff;
  box-shadow:0 34px 70px -34px rgba(10,38,70,.7);
}
.cta-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    radial-gradient(560px 320px at 20% 0%, rgba(47,168,222,.4), transparent 64%),
    radial-gradient(520px 300px at 86% 100%, rgba(124,107,255,.34), transparent 64%);
}
.cta-band h2{position:relative;font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:800;letter-spacing:-.03em;}
.cta-band > p{position:relative;color:rgba(255,255,255,.78);margin-top:12px;}
.cta-actions{position:relative;display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:26px;}
.cta-note{position:relative;margin-top:16px;font-size:.82rem;color:rgba(255,255,255,.62);}

/* ===== 15. 关键词条 ===== */
.kw-band{
  padding:28px 30px;border-radius:var(--radius-xl);text-align:center;
  background:rgba(255,255,255,.82);border:var(--line);box-shadow:var(--shadow-sm);
}
.kw-band h2{
  font-size:.95rem;font-weight:800;letter-spacing:.04em;color:var(--ink-3);margin-bottom:18px;
}
.kw-list{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;}
.kw-list a{
  padding:8px 16px;border-radius:999px;font-size:.86rem;font-weight:700;color:var(--ink-2);
  background:rgba(47,168,222,.08);border:1px solid rgba(47,168,222,.2);
  transition:color .18s ease,background .18s ease,transform .18s ease,box-shadow .18s ease;
}
.kw-list a:hover{transform:translateY(-2px);color:#fff;background:var(--grad-blue);border-color:transparent;box-shadow:var(--shadow-blue);}

/* ===== 16. 页脚 ===== */
.footer{
  margin-top:70px;padding:54px 0 26px;
  background:rgba(255,255,255,.72);
  border-top:1px solid rgba(28,84,132,.1);
}
.footer-grid{display:grid;grid-template-columns:1fr 1.1fr 1.1fr;gap:36px;}
.footer-brand p{margin-top:16px;color:var(--ink-2);font-size:.92rem;max-width:34em;}
.footer-nav h3{
  font-size:.82rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);margin-bottom:16px;
}
.footer-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px 14px;font-size:.9rem;}
.footer-links a{color:var(--ink-2);font-weight:700;transition:color .16s ease;}
.footer-links a:hover{color:var(--blue-ink);}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  margin-top:38px;padding-top:20px;border-top:1px solid rgba(28,84,132,.1);
  color:var(--ink-3);font-size:.82rem;
}
.footer-bottom a{font-weight:700;}
.footer-bottom a:hover{color:var(--blue-ink);}

/* ===== 17. 下载弹窗 ===== */
.modal{
  position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:22px;
  opacity:0;visibility:hidden;transition:opacity .22s ease,visibility .22s ease;
}
.modal.is-open{opacity:1;visibility:visible;}
.modal-overlay{position:absolute;inset:0;background:rgba(15,39,64,.5);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);}
.modal-box{
  position:relative;z-index:1;width:100%;max-width:472px;
  padding:32px 28px 24px;border-radius:var(--radius-xl);
  background:#fff;border:var(--line);box-shadow:0 40px 80px -40px rgba(10,38,70,.7);
  transform:translateY(12px) scale(.98);transition:transform .26s ease;
}
.modal.is-open .modal-box{transform:none;}
.modal-close{
  position:absolute;right:16px;top:16px;width:34px;height:34px;border-radius:11px;
  font-size:1.15rem;line-height:1;color:var(--ink-2);background:rgba(28,84,132,.07);
  transition:background .18s ease,color .18s ease;
}
.modal-close:hover{background:rgba(47,168,222,.16);color:var(--blue-ink);}
.modal-box h3{font-size:1.3rem;font-weight:800;letter-spacing:-.02em;}
.modal-sub{color:var(--ink-3);font-size:.9rem;margin-top:6px;}
.platform-list{display:grid;gap:12px;margin-top:20px;}
.platform{
  display:flex;align-items:center;gap:14px;padding:16px 18px;border-radius:var(--radius);
  background:#fff;border:var(--line-2);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.platform:hover{transform:translateY(-3px);border-color:rgba(47,168,222,.5);box-shadow:var(--shadow);}
.p-icon{
  width:44px;height:44px;flex:none;border-radius:14px;display:grid;place-items:center;
  background:var(--grad-blue);color:#fff;box-shadow:0 12px 22px -12px rgba(47,168,222,.85);
}
.p-icon.tone-mint{background:var(--grad-mint);box-shadow:0 12px 22px -12px rgba(34,199,155,.85);}
.p-icon svg{width:22px;height:22px;}
.platform b{display:block;font-size:.99rem;font-weight:800;}
.platform small{display:block;color:var(--ink-3);font-size:.83rem;}
.p-arrow{margin-left:auto;font-weight:800;color:var(--ink-3);transition:transform .16s ease,color .16s ease;}
.platform:hover .p-arrow{color:var(--blue-ink);transform:translateX(4px);}
.modal-foot{margin-top:16px;text-align:center;font-size:.8rem;color:var(--ink-3);}
.modal-foot a{font-weight:700;color:var(--blue-ink);text-decoration:underline;}

/* ===== 18. 长文（教程 / 协议） ===== */
.breadcrumb{
  font-size:.78rem;font-weight:800;color:var(--ink-3);
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:20px;
}
.breadcrumb a{color:var(--ink-2);}
.breadcrumb a:hover{color:var(--blue-ink);text-decoration:underline;}
.breadcrumb span{opacity:.55;}

.post{max-width:820px;margin:0 auto;padding:44px 0 10px;}
.post-header .post-badge{
  display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:999px;
  font-size:.74rem;font-weight:800;letter-spacing:.08em;
  color:var(--blue-ink);background:rgba(47,168,222,.13);
  border:1px solid rgba(47,168,222,.32);
}
.post-title{
  font-size:clamp(1.65rem,4vw,2.35rem);font-weight:800;letter-spacing:-.03em;
  line-height:1.28;margin:20px 0 14px;
}
.post-meta{
  display:flex;flex-wrap:wrap;gap:16px;color:var(--ink-3);font-size:.85rem;font-weight:700;
  padding-bottom:22px;border-bottom:1px dashed rgba(28,84,132,.22);
}
.post-body{padding-top:28px;}
.post-body h2{
  font-size:1.34rem;font-weight:800;letter-spacing:-.02em;
  margin:38px 0 14px;padding-left:15px;position:relative;
}
.post-body h2::before{
  content:"";position:absolute;left:0;top:.26em;bottom:.26em;width:6px;border-radius:4px;
  background:var(--grad-blue);
}
.post-body h3{font-size:1.1rem;font-weight:800;margin:26px 0 10px;}
.post-body p{color:var(--ink-2);font-size:.97rem;margin:14px 0;}
.post-body strong{color:var(--ink);}
.post-body a{color:var(--blue-ink);font-weight:700;border-bottom:2px solid rgba(47,168,222,.42);}
.post-body a:hover{color:var(--blue-deep);border-bottom-color:var(--blue-deep);}
.post-body ul,.post-body ol{margin:16px 0;display:grid;gap:10px;}
.post-body ul li{position:relative;padding-left:20px;color:var(--ink-2);font-size:.96rem;}
.post-body ul li::before{
  content:"";position:absolute;left:0;top:.66em;width:8px;height:8px;border-radius:3px;
  background:var(--grad-blue);
}
.post-body ol{counter-reset:ol;padding-left:0;}
.post-body ol li{
  position:relative;padding-left:36px;color:var(--ink-2);font-size:.96rem;counter-increment:ol;
}
.post-body ol li::before{
  content:counter(ol,decimal-leading-zero);
  position:absolute;left:0;top:0;font-size:.82rem;font-weight:900;color:var(--blue-deep);
}
.post-body blockquote{
  margin:24px 0;padding:18px 22px;border-radius:var(--radius);
  background:rgba(47,168,222,.07);border:1px solid rgba(47,168,222,.26);
  border-left:5px solid var(--blue);
  color:var(--ink);font-size:.95rem;font-weight:600;
}
.post-body code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.86em;
  padding:2px 7px;border-radius:6px;background:rgba(47,168,222,.12);color:var(--blue-ink);
}
.post-body pre{
  margin:20px 0;padding:18px 20px;border-radius:var(--radius);overflow-x:auto;
  background:#0E2647;color:#DCEBF7;
}
.post-body pre code{background:none;padding:0;font-size:.86rem;color:#BDF3F7;}
.post-body table{
  width:100%;border-collapse:collapse;margin:22px 0;font-size:.9rem;
  border:var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;
  box-shadow:var(--shadow-sm);
}
.post-body th,.post-body td{padding:12px 14px;text-align:left;border-bottom:1px solid rgba(28,84,132,.1);}
.post-body th{background:rgba(47,168,222,.1);color:var(--blue-ink);font-weight:800;}
.post-body td{color:var(--ink-2);}
.post-body tr:last-child td{border-bottom:0;}
.article-nav{display:flex;flex-wrap:wrap;gap:14px;margin:38px 0 8px;}

.post-faq{margin-top:44px;}
.post-faq h2{font-size:1.3rem;font-weight:800;margin-bottom:18px;}
.post-faq .faq-item{
  border-radius:var(--radius);margin-bottom:12px;
  background:#fff;border:var(--line);box-shadow:var(--shadow-sm);overflow:hidden;
}
.post-faq summary{
  cursor:pointer;list-style:none;padding:18px 22px;font-weight:800;font-size:.98rem;
  display:flex;align-items:center;gap:12px;
}
.post-faq summary::-webkit-details-marker{display:none;}
.post-faq summary::after{content:"+";margin-left:auto;font-weight:900;color:var(--blue-deep);font-size:1.2rem;}
.post-faq details[open] summary::after{content:"-";}
.post-faq p{padding:0 22px 20px;color:var(--ink-2);font-size:.93rem;}

.related{margin-top:46px;padding-top:30px;border-top:1px dashed rgba(28,84,132,.22);}
.related h2{font-size:1.12rem;font-weight:800;margin-bottom:18px;}
.related-list{display:grid;gap:12px;}
.related-list a{
  display:flex;align-items:center;gap:14px;padding:16px 20px;border-radius:var(--radius);
  background:#fff;border:var(--line);box-shadow:var(--shadow-sm);
  transition:transform .18s ease,box-shadow .18s ease;
}
.related-list a:hover{transform:translateX(5px);box-shadow:var(--shadow);}
.related-list b{font-weight:800;font-size:.95rem;}
.related-list small{display:block;color:var(--ink-3);font-size:.82rem;}
.r-arrow{margin-left:auto;color:var(--ink-3);font-weight:900;}

/* ===== 19. 协议页 ===== */
.legal{max-width:820px;margin:0 auto;padding:48px 0 24px;}
.legal h1{font-size:clamp(1.6rem,4vw,2.1rem);font-weight:800;letter-spacing:-.03em;margin-bottom:12px;}
.legal .legal-meta{color:var(--ink-3);font-size:.85rem;font-weight:700;padding-bottom:22px;border-bottom:1px dashed rgba(28,84,132,.22);}
.legal h2{font-size:1.2rem;font-weight:800;margin:34px 0 12px;}
.legal p{color:var(--ink-2);font-size:.96rem;margin:12px 0;}
.legal ul{margin:14px 0;display:grid;gap:9px;}
.legal ul li{position:relative;padding-left:20px;color:var(--ink-2);font-size:.95rem;}
.legal ul li::before{
  content:"";position:absolute;left:0;top:.64em;width:8px;height:8px;border-radius:3px;
  background:var(--grad-blue);
}
.legal a{color:var(--blue-ink);font-weight:700;border-bottom:2px solid rgba(47,168,222,.42);}
.legal a:hover{color:var(--blue-deep);border-bottom-color:var(--blue-deep);}
.legal .legal-card{
  margin-top:22px;padding:22px 24px;border-radius:var(--radius-lg);
  background:#fff;border:var(--line);box-shadow:var(--shadow-sm);
}
.legal .legal-card dt{font-weight:800;font-size:.92rem;color:var(--ink);margin-top:14px;}
.legal .legal-card dt:first-child{margin-top:0;}
.legal .legal-card dd{margin:4px 0 0;color:var(--ink-2);font-size:.92rem;}

/* ===== 20. 404 ===== */
.err{min-height:62vh;display:grid;place-items:center;text-align:center;padding:60px 0;}
.err-code{
  font-size:clamp(4rem,14vw,8rem);font-weight:900;line-height:1;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  background:var(--text-grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}
.err h1{font-size:1.5rem;font-weight:800;margin:18px 0 12px;}
.err p{color:var(--ink-2);}
.err .err-actions{display:flex;gap:14px;justify-content:center;margin-top:26px;flex-wrap:wrap;}

/* ===== 21. 滚动进场 ===== */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.8,.3,1);}
.reveal.is-visible{opacity:1;transform:none;}

/* ===== 22. 首屏预览放大 ===== */
.hero{padding:52px 0 84px;}
.hero-grid{grid-template-columns:.84fr 1.28fr;gap:44px;}
.hero-title{font-size:clamp(2.15rem,4.9vw,3.15rem);}
.hero-sub{font-size:1.06rem;}
.hero-visual{width:100%;justify-items:center;}
.phone{width:min(398px,82vw);}
@media (max-width:1180px){
  .hero-grid{grid-template-columns:1fr 1.15fr;gap:36px;}
}

/* ===== 23. 响应式 ===== */
@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr;gap:44px;}
  .hero-copy{order:1;}
  .hero-visual{order:2;max-width:620px;margin:0 auto;}
  .hero-sub{max-width:none;}
  .features{grid-template-columns:repeat(2,1fr);}
  .band{padding:44px 34px;}
  .band-grid{grid-template-columns:1fr;gap:28px;}
  .steps{grid-template-columns:repeat(2,1fr);}
  .about{grid-template-columns:1fr;gap:24px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px;}
  .footer-brand{grid-column:1 / -1;}
}
@media (max-width:900px){
  .nav-links{display:none;}
  .nav-cta{margin-left:auto;}
  .nav-toggle{display:block;}
  .section{padding:60px 0;}
  .header .wrap{padding:0 18px;}
  /* 亮点条：窄屏一行一条，避免窄栏把中文挤断 */
  .stat-bar{grid-template-columns:1fr;gap:12px;}
  .stat-item{
    display:grid;grid-template-columns:auto 1fr;align-items:center;
    gap:2px 14px;text-align:left;padding:16px 20px;transform:none;
  }
  .stat-item:hover{transform:none;}
  .stat-item .s-tag{grid-column:1;grid-row:1;margin-bottom:0;justify-self:start;}
  .stat-item .s-name{grid-column:2;grid-row:1;}
  .stat-item .s-desc{grid-column:1 / -1;grid-row:2;margin-top:4px;}
  .about{padding:30px 22px;}
  .about-grid{grid-template-columns:1fr;}
  .about-art{max-width:420px;margin:0 auto;}
  /* 截图区改成可滑动横排，配箭头 + 圆点 + 张数提示 */
  .shots{
    display:flex;gap:16px;max-width:none;margin:0;
    overflow-x:auto;overflow-y:hidden;overscroll-behavior-x:contain;
    scroll-snap-type:x mandatory;
    padding:14px 2px 20px;
    scrollbar-width:none;-ms-overflow-style:none;
  }
  .shots::-webkit-scrollbar{display:none;}
  .shots.is-dragging{cursor:grabbing;scroll-snap-type:none;}
  .shot{flex:0 0 min(320px,68vw);scroll-snap-align:center;}
  .shots-nav{display:flex;}
  .shots-hint{display:block;}
}
@media (max-width:640px){
  .wrap{padding:0 18px;}
  .features{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
  .shot{flex:0 0 78vw;}
  .shots-arrow{width:40px;height:40px;}
  .footer-grid{grid-template-columns:1fr;gap:26px;}
  .footer-links{grid-template-columns:repeat(2,minmax(0,1fr));}
  .hero{padding:34px 0 60px;}
  .hero-title{font-size:clamp(1.95rem,8.6vw,2.55rem);}
  .hero-actions .btn{flex:1 1 auto;justify-content:center;}
  .phone{width:min(340px,86vw);padding:9px;border-radius:38px;}
  .phone-screen{border-radius:30px;}
  .chip-a{left:-6px;}
  .chip-b{right:-6px;}
  .chip-c{left:-2px;}
  .slide-badge{right:-6px;}
  .stat-item:hover{transform:none;}
  .faq-q{padding:18px;}
  .faq-a-inner p{padding:0 18px 20px;}
  .cta-band{padding:40px 20px;}
  .cta-band .btn{width:100%;}
  .kw-band{padding:22px 18px;}
  .modal-box{padding:26px 20px 22px;}
  .band{padding:30px 20px;}
  .post{padding:30px 0 0;}
  .shot-meta{padding:13px 13px 15px;}
}

/* ===== 24. 动效降级 ===== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  .eyebrow::before{animation:none;}
  .reveal{opacity:1;transform:none;transition:none;}
  .slides-track img{transition:none;}
  .stat-item{transform:none;}
  .card:hover,.stat-item:hover,.shot:hover,.related-list a:hover,.platform:hover{transform:none;}
}

/* ===== 25. 图片与版式微调 ===== */
.shots{padding:10px 2px 32px;}
.shot-meta{padding:16px 18px 18px;}
.shot-meta h3{font-size:1.02rem;margin-bottom:6px;}
.shot-meta p{font-size:.86rem;}
.shot-tag{font-size:.71rem;padding:5px 11px;}

.plus-band{margin-bottom:26px;}

/* ===== 26. 移动端长文表格 ===== */
@media (max-width:640px){
  .post-body table{font-size:.85rem;}
  .post-body th,.post-body td{padding:10px 9px;}
  .post-body table td:first-child,
  .post-body table th:first-child{white-space:nowrap;}
}

/* ===== 27. 关于本站竖屏配图 ===== */
.about-art.is-portrait img{aspect-ratio:4 / 5;object-fit:cover;object-position:top center;height:auto;}
@media (max-width:900px){
  .about-art.is-portrait{max-width:400px;}
}