/* 纸飞机 · 晴空航迹 Sky Trajectory —— 浅色明亮蓝天白云主题 */
:root{
  --bg:#f4f8fd;
  --bg-2:#eaf1fa;
  --bg-3:#dfe9f5;
  --ink:#15324e;
  --muted:#5a7188;
  --muted-2:#8aa0b5;
  --blue:#2f80ed;
  --blue-deep:#1b5fd0;
  --amber:#f5a623;
  --amber-deep:#e8930f;
  --teal:#16b6b6;
  --panel:#ffffff;
  --panel-glass:rgba(255,255,255,.78);
  --border:#e0eaf5;
  --border-soft:#ecf2f9;
  --grad:linear-gradient(120deg,#2f80ed 0%,#16b6b6 100%);
  --grad-soft:linear-gradient(135deg,#2f80ed 0%,#16b6b6 100%);
  --shadow:0 10px 30px rgba(23,58,94,.08);
  --shadow-lg:0 18px 48px rgba(23,58,94,.14);
  --radius:18px;
  --max:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ===== 顶部导航(白色毛玻璃 sticky) ===== */
.site-nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border-soft)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px;gap:18px}
.nav-logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand-ico{width:38px;height:38px;border-radius:9px;flex-shrink:0;box-shadow:0 4px 12px rgba(47,128,237,.28)}
.nav-word{font-size:19px;font-weight:800;color:var(--ink);letter-spacing:.5px}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-item{position:relative;padding:8px 14px;font-size:15px;font-weight:600;color:var(--muted);border-radius:10px;transition:color .2s,background .2s}
.nav-item.on{color:var(--blue)}
.nav-item:hover{color:var(--ink);background:var(--bg-2)}
.nav-top{display:inline-flex;align-items:center;gap:6px;cursor:default}
.caret{font-size:11px;opacity:.7}
.has-sub:hover .nav-menu{opacity:1;visibility:visible;transform:translateY(0)}
.nav-menu{position:absolute;top:100%;left:0;min-width:200px;background:#fff;border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-lg);padding:8px;opacity:0;visibility:hidden;transform:translateY(8px);transition:.2s}
.nav-sub-item{display:block;padding:9px 14px;font-size:14px;font-weight:500;color:var(--muted);border-radius:9px}
.nav-sub-item:hover{color:var(--blue);background:var(--bg-2)}
.nav-cta{display:inline-flex;align-items:center;padding:9px 22px;font-size:15px;font-weight:700;color:#fff;background:var(--amber);border-radius:999px;box-shadow:0 6px 16px rgba(245,166,35,.35);transition:transform .2s,background .2s}
.nav-cta:hover{background:var(--amber-deep);transform:translateY(-1px)}

/* ===== 全屏明亮 hero ===== */
.hero{position:relative;overflow:hidden;background:var(--bg-2)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(244,248,253,.9) 0%,rgba(244,248,253,.45) 100%)}
.hero-plane{position:absolute;top:14%;right:8%;width:150px;color:var(--blue);opacity:.9;animation:float 6s ease-in-out infinite}
.hero-inner{position:relative;z-index:2;padding:96px 24px 84px;max-width:var(--max);margin:0 auto}
.hero-eyebrow{display:inline-block;font-size:14px;font-weight:700;letter-spacing:.5px;color:var(--blue);background:rgba(47,128,237,.1);padding:6px 14px;border-radius:999px;margin-bottom:22px}
.hero-title{font-size:clamp(40px,6.5vw,66px);font-weight:800;line-height:1.08;letter-spacing:-1px;color:var(--ink)}
.hero-title em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{font-size:18px;color:var(--muted);max-width:640px;margin-top:20px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-plats{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.hero-plats span{font-size:13px;font-weight:600;color:var(--muted);background:#fff;border:1px solid var(--border);padding:5px 12px;border-radius:999px}
@keyframes float{0%,100%{transform:translateY(0) rotate(-6deg)}50%{transform:translateY(-16px) rotate(2deg)}}

/* ===== 分屏 hero(左文 + 右聊天窗口 mockup) ===== */
.hero-split{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.hero-copy{max-width:560px}
.hero-trust{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.hero-trust span{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--blue-deep);background:#fff;border:1px solid var(--border);padding:6px 13px;border-radius:999px}
.hero-phone{position:relative;display:flex;justify-content:center}
.chat-card{width:320px;max-width:100%;background:#fff;border-radius:20px;box-shadow:var(--shadow-lg);overflow:hidden;border:1px solid var(--border)}
.chat-head{display:flex;align-items:center;gap:10px;padding:13px 16px;background:var(--grad);color:#fff}
.chat-avatar{width:34px;height:34px;border-radius:50%;background:rgba(255,255,255,.24);display:flex;align-items:center;justify-content:center;font-size:17px}
.chat-name{font-weight:700;font-size:15px}
.chat-online{margin-left:auto;font-size:12px;opacity:.92}
.chat-body{padding:16px;display:flex;flex-direction:column;gap:10px;background:#f4f8fd}
.msg{max-width:80%;padding:10px 13px;border-radius:14px;font-size:13.5px;line-height:1.5;box-shadow:0 1px 3px rgba(0,0,0,.05)}
.msg.in{background:#fff;align-self:flex-start;border-bottom-left-radius:4px;color:var(--ink)}
.msg.out{background:var(--blue);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.chat-input{display:flex;align-items:center;gap:10px;padding:11px 15px;border-top:1px solid var(--border-soft);background:#fff;font-size:13px;color:var(--muted-2)}
.chat-send{margin-left:auto;width:32px;height:32px;border-radius:50%;background:var(--amber);color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px}
.float-badge{position:absolute;background:#fff;border:1px solid var(--border);border-radius:12px;padding:8px 13px;font-size:12.5px;font-weight:700;box-shadow:var(--shadow);white-space:nowrap}
.badge-sent{top:16%;left:-12px;color:var(--teal)}
.badge-secure{bottom:14%;right:-12px;color:var(--blue-deep)}

/* ===== 信任条(签名替代) ===== */
.trust-strip{background:var(--grad);color:#fff}
.trust-inner{display:flex;justify-content:center;flex-wrap:wrap;gap:14px 36px;padding:18px 24px}
.trust-inner span{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14px}

/* ===== 功能 bento ===== */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.bento-card{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:28px 24px;transition:transform .2s,box-shadow .2s}
.bento-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.b-icon{width:46px;height:46px;border-radius:13px;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px;background:rgba(47,128,237,.12)}
.bento-card h3{font-size:18px;font-weight:800;color:var(--ink);margin-bottom:8px}
.bento-card p{font-size:14px;color:var(--muted);line-height:1.7}

/* ===== 居中 hero(虚化背景 + 手机 mockup + 下载枢纽) ===== */
.hero-blur{position:absolute;inset:-30px;width:calc(100% + 60px);height:calc(100% + 60px);object-fit:cover;filter:blur(22px);transform:scale(1.02)}
.hero-veil{position:absolute;inset:0;background:linear-gradient(180deg,rgba(244,248,253,.62) 0%,rgba(244,248,253,.48) 100%)}
.hero-center{position:relative;z-index:2;text-align:center;padding:64px 24px 86px;max-width:960px;margin:0 auto}
.hero-center .hero-title{margin:0 auto}
.hero-center .hero-sub{margin-left:auto;margin-right:auto}
.phone-stage{position:relative;display:flex;justify-content:center;margin-top:44px}
.download-hub{display:flex;flex-direction:column;align-items:center;gap:18px;margin-top:44px}
.btn-lg{padding:16px 46px;font-size:17px;border-radius:999px}
.hub-plats{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;max-width:640px}
.hub-plat{display:inline-flex;align-items:center;gap:7px;padding:9px 16px;font-size:13.5px;font-weight:600;color:var(--ink);background:#fff;border:1px solid var(--border);border-radius:999px;box-shadow:0 2px 8px rgba(23,58,94,.05);transition:transform .2s,color .2s,border-color .2s}
.hub-plat:hover{color:var(--blue);border-color:var(--blue);transform:translateY(-2px)}
.hub-ghost{font-size:14px;font-weight:700;color:var(--blue)}

/* ===== 跑马灯 ===== */
.marquee{overflow:hidden;border-top:1px solid var(--border-soft);border-bottom:1px solid var(--border-soft);background:#fff;padding:14px 0}
.marquee-track{display:flex;gap:52px;white-space:nowrap;width:max-content;animation:scrollx 32s linear infinite}
.marquee-track span{font-size:15px;font-weight:700;color:var(--muted);display:inline-flex;align-items:center;gap:14px}
.marquee-track span b{color:var(--blue);font-weight:800}
@keyframes scrollx{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ===== 照片瓷砖墙(功能) ===== */
.tilewall{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.tile{position:relative;border-radius:18px;overflow:hidden;height:238px;box-shadow:var(--shadow)}
.tile img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.tile:hover img{transform:scale(1.06)}
.tile-cap{position:absolute;left:0;right:0;bottom:0;padding:42px 18px 16px;background:linear-gradient(180deg,rgba(255,255,255,0),rgba(255,255,255,.94));backdrop-filter:blur(2px)}
.tile-cap h3{font-size:16px;font-weight:800;color:var(--ink)}
.tile-cap p{font-size:12.5px;color:var(--muted);margin-top:2px}

/* ===== 天空航线图 hero(插图式航线 + 漂浮功能点) ===== */
.sky-hero{position:relative;overflow:hidden;padding:86px 24px 120px;background:linear-gradient(180deg,#d5ebfd 0%,#e9f3fc 50%,#f4f8fd 100%)}
.cloud{position:absolute;background:#fff;border-radius:50%;opacity:.85;filter:blur(1px);box-shadow:0 0 60px rgba(255,255,255,.5)}
.cloud.c1{width:190px;height:62px;top:11%;left:5%}
.cloud.c2{width:250px;height:72px;top:20%;right:7%}
.cloud.c3{width:150px;height:50px;bottom:14%;left:16%}
.cloud.c4{width:210px;height:58px;bottom:10%;right:18%}
.cloud.c5{width:120px;height:44px;top:42%;left:2%;opacity:.6}
.cloud.c6{width:170px;height:56px;top:52%;right:3%;opacity:.7}
.cloud.c7{width:140px;height:48px;top:7%;left:36%;opacity:.6}
.cloud.c8{width:92px;height:36px;bottom:24%;left:5%;opacity:.5}
.sky-route{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.route-dash{fill:none;stroke:var(--blue);stroke-width:2.5;stroke-dasharray:2 13;stroke-linecap:round;opacity:.42}
.sky-plane{position:absolute;right:15%;top:16%;width:118px;color:var(--blue);opacity:.95;transform:rotate(10deg);animation:floaty 7s ease-in-out infinite}
.sky-inner{position:relative;z-index:2;max-width:1120px;margin:0 auto}
.sky-copy{max-width:600px}
.sky-copy .download-hub{align-items:flex-start}
.sky-copy .hub-plats{justify-content:flex-start}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-13px)}}

/* ===== 折纸招牌卡 ===== */
.origami{padding:56px 0 0}
.origami-card{display:flex;align-items:center;gap:48px;padding:40px 44px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.origami-visual{flex:0 0 240px;display:flex;align-items:center;justify-content:center}
.origami-visual svg{width:100%;height:auto}
.origami-copy{flex:1}
.origami-copy h2{font-size:26px;font-weight:800;color:var(--ink);line-height:1.35}
.origami-note{margin-top:14px;color:var(--muted);font-size:16px;max-width:560px}
.origami-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.origami-chip{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--blue-deep);background:rgba(47,128,237,.08);padding:6px 13px;border-radius:999px}

/* ===== 通用 section / 标题 ===== */
.section{padding:76px 0}
.section.alt{background:var(--bg-2)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px}
.sec-head .left{flex:1}
.kicker{display:inline-block;font-size:13px;font-weight:800;letter-spacing:2px;text-transform:uppercase;color:var(--blue);margin-bottom:12px}
.sec-title{font-size:clamp(26px,3.4vw,38px);font-weight:800;color:var(--ink);letter-spacing:-.5px;line-height:1.2}
.sec-sub{font-size:16px;color:var(--muted);margin-top:12px;max-width:620px}
.sec-more{flex-shrink:0}

/* ===== 编辑部式功能块(图/文交替) ===== */
.feat-row{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;padding:34px 0;border-bottom:1px solid var(--border-soft)}
.feat-row:last-child{border-bottom:none}
.feat-row.rev .feat-media{order:-1}
.feat-copy{position:relative;padding-left:64px}
.feat-num{position:absolute;left:0;top:-8px;font-size:58px;font-weight:800;line-height:1;color:var(--bg-3);-webkit-text-stroke:1px var(--border)}
.feat-copy h3{font-size:24px;font-weight:800;color:var(--ink);margin-bottom:12px}
.feat-copy p{color:var(--muted);font-size:16px}
.feat-media{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.feat-media img{width:100%;height:280px;object-fit:cover;transition:transform .4s}
.feat-media:hover img{transform:scale(1.05)}
.feat-media .tag{position:absolute;left:14px;bottom:14px;font-size:12px;font-weight:700;color:#fff;background:rgba(21,50,78,.62);backdrop-filter:blur(6px);padding:5px 12px;border-radius:999px}

/* ===== 平台 rail ===== */
.rail-head{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:30px}
.rail-track{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.rail-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:22px 18px;text-align:left;transition:transform .2s,box-shadow .2s}
.rail-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.rail-card .ico{font-size:30px;display:block;margin-bottom:12px}
.rail-card h3{font-size:16px;font-weight:700;color:var(--ink);margin-bottom:6px}
.rail-card p{font-size:13px;color:var(--muted-2);margin-bottom:14px}
.rail-card .go{font-size:14px;font-weight:700;color:var(--blue)}

/* ===== 数据行 ===== */
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat-item{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:30px 22px;text-align:center;box-shadow:var(--shadow)}
.stat-num{display:block;font-size:40px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat-label{display:block;font-size:14px;color:var(--muted);margin-top:6px}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 30px;font-size:16px;font-weight:700;border-radius:12px;transition:transform .2s,box-shadow .2s,background .2s;cursor:pointer;border:none}
.btn-primary{background:var(--amber);color:#fff;box-shadow:0 8px 20px rgba(245,166,35,.36)}
.btn-primary:hover{background:var(--amber-deep);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--blue);border:1.5px solid var(--blue)}
.btn-ghost:hover{background:rgba(47,128,237,.08);transform:translateY(-2px)}
.btn-link{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:700;color:var(--blue)}

/* ===== CTA 带(明亮天空 + 蓝渐变遮罩) ===== */
.cta-band{position:relative;overflow:hidden;margin-top:40px}
.cta-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.cta-overlay{position:absolute;inset:0;background:linear-gradient(120deg,rgba(31,95,208,.88) 0%,rgba(22,182,182,.82) 100%)}
.cta-inner{position:relative;z-index:2;text-align:center;padding:86px 24px;color:#fff}
.cta-title{font-size:clamp(28px,4vw,42px);font-weight:800;letter-spacing:-.5px}
.cta-sub{font-size:16px;max-width:600px;margin:16px auto 30px;opacity:.94}
.cta-inner .btn-primary{background:#fff;color:var(--blue-deep);box-shadow:0 10px 26px rgba(0,0,0,.18)}
.cta-inner .btn-primary:hover{background:#f2f7ff}

/* ===== 页脚(深蓝) ===== */
.site-foot{background:#0f2138;color:#c6d4e4;margin-top:40px}
.foot-inner{display:flex;align-items:center;justify-content:space-between;padding:26px 24px;flex-wrap:wrap;gap:12px}
.foot-brand{font-size:15px;font-weight:700;color:#fff}
.foot-brand em{font-style:normal;font-weight:500;color:#8aa0b5;font-size:13px}
.foot-copy{font-size:13px;color:#8aa0b5}

/* ===== 返回顶部 ===== */
.backtop{position:fixed;right:22px;bottom:26px;width:44px;height:44px;border-radius:12px;background:var(--blue);color:#fff;font-size:20px;border:none;cursor:pointer;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translateY(10px);transition:.25s;z-index:60}
.backtop.show{opacity:1;visibility:visible;transform:translateY(0)}

/* ===== 子页 page-hero ===== */
.page-hero{background:radial-gradient(1200px 400px at 20% -10%,rgba(47,128,237,.12),transparent),var(--bg);padding:58px 0 44px;border-bottom:1px solid var(--border-soft)}
.page-title{font-size:clamp(30px,4.4vw,44px);font-weight:800;color:var(--ink);letter-spacing:-.5px;margin:14px 0 12px}
.page-lead{font-size:17px;color:var(--muted);max-width:720px}
.article-meta{display:flex;flex-wrap:wrap;gap:16px;margin-top:20px;font-size:14px;color:var(--muted)}
.article-meta b{color:var(--ink)}
.article-meta .btn{margin-right:8px}

/* ===== 面包屑 ===== */
.crumb{font-size:13px;color:var(--muted-2);display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumb a{color:var(--blue)}
.crumb a:hover{text-decoration:underline}
.crumb .sep{color:var(--muted-2)}

/* ===== 分屏 split ===== */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split-media img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}
.split-body .kicker{margin-bottom:10px}
.split-body h2{font-size:clamp(24px,3vw,32px);font-weight:800;color:var(--ink);margin-bottom:16px}
.split-body p{color:var(--muted);margin-bottom:12px}

/* ===== 步骤 ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:26px 22px;box-shadow:var(--shadow)}
.step h3{font-size:17px;font-weight:800;color:var(--ink);margin-bottom:10px}
.step p{font-size:14px;color:var(--muted)}

/* ===== 表格 ===== */
.table-wrap{overflow-x:auto;background:var(--panel);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow)}
.table-wrap table{width:100%;border-collapse:collapse;min-width:420px}
.table-wrap th,.table-wrap td{padding:13px 18px;text-align:left;font-size:14px;border-bottom:1px solid var(--border-soft)}
.table-wrap th{background:var(--bg-2);font-weight:700;color:var(--ink)}
.table-wrap tr:last-child td{border-bottom:none}

/* ===== 提示框 / 引用 ===== */
.tip{background:rgba(47,128,237,.08);border:1px solid rgba(47,128,237,.22);border-radius:14px;padding:16px 20px;margin:18px 0}
.tip p{color:var(--blue-deep);font-size:14px}
.callout{background:rgba(245,166,35,.1);border-left:4px solid var(--amber);border-radius:10px;padding:16px 20px;margin:18px 0}
.callout p{color:#7a5300;font-size:14px}
blockquote{border-left:4px solid var(--blue);background:var(--bg-2);padding:16px 20px;border-radius:10px;margin:18px 0;color:var(--muted)}

/* ===== 文章排版 ===== */
.article-layout{display:grid;grid-template-columns:230px 1fr;gap:48px;align-items:start}
.toc{position:sticky;top:90px;background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:20px}
.toc h4{font-size:14px;font-weight:800;color:var(--ink);margin-bottom:12px}
.toc a{display:block;font-size:13px;color:var(--muted);padding:6px 0;border-bottom:1px dashed var(--border-soft)}
.toc a:hover{color:var(--blue)}
.prose{color:var(--ink);font-size:16.5px;line-height:1.9}
.prose h2{font-size:26px;font-weight:800;margin:36px 0 14px;color:var(--ink);scroll-margin-top:90px}
.prose p{margin-bottom:16px;color:#2c4358}
.prose ul,.prose ol{margin:0 0 16px 22px}
.prose li{margin-bottom:8px}
.prose figure{margin:22px 0}
.prose figure img{width:100%;border-radius:14px;box-shadow:var(--shadow)}
.prose figcaption{font-size:13px;color:var(--muted-2);text-align:center;margin-top:8px}
.lead-fig img{max-height:420px;object-fit:cover}

/* ===== 相关卡片 ===== */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.rel-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:20px;transition:transform .2s,box-shadow .2s}
.rel-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.rel-card .t{font-size:16px;font-weight:700;color:var(--ink);margin-bottom:8px}
.rel-card .d{font-size:13px;color:var(--muted)}

/* ===== FAQ ===== */
.faq-block{max-width:760px}
.faq-group{margin-bottom:34px}
.faq-group h2{font-size:21px;font-weight:800;color:var(--ink);margin-bottom:14px}
.faq-group details,.faq-item{background:var(--panel);border:1px solid var(--border);border-radius:14px;margin-bottom:12px;overflow:hidden}
.faq-group summary,.faq-item summary{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;font-size:15px;font-weight:700;color:var(--ink);cursor:pointer;list-style:none}
.faq-group summary::after,.faq-item summary::after{content:"+";font-size:20px;color:var(--blue)}
.faq-group .a,.faq-item .a{padding:0 20px 18px;font-size:15px;color:var(--muted)}

/* ===== 404 / 搜索 ===== */
.notfound{text-align:center;padding:50px 0}
.notfound .big{font-size:80px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:4px}
.notfound p{color:var(--muted);margin:16px 0 26px}
.search-box{display:flex;gap:10px;max-width:520px;margin-top:20px}
.search-input{flex:1;padding:13px 18px;font-size:15px;border:1.5px solid var(--border);border-radius:12px;background:#fff;color:var(--ink);outline:none}
.search-input:focus{border-color:var(--blue)}

/* ===== 响应式 ===== */
@media (max-width:900px){
  .hero-center{padding:56px 20px 64px}
  .hero-plane{display:none}
  .float-badge{display:none}
  .sky-plane{display:none}
  .sky-copy{max-width:100%}
  .hub-plats{max-width:100%}
  .marquee-track{gap:30px}
  .tilewall{grid-template-columns:1fr}
  .tile{height:200px}
  .rail-track{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr;gap:28px}
  .steps{grid-template-columns:1fr}
  .article-layout{grid-template-columns:1fr}
  .toc{position:static}
  .rel-grid{grid-template-columns:1fr}
  .nav-links{display:none}
}

/* ===== reviews ===== */
.reviews-sec{background:var(--bg-2)}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:24px;box-shadow:0 12px 32px rgba(0,0,0,.35)}
.review-card .stars{color:#f5a623;font-size:16px;letter-spacing:2px;margin-bottom:12px}
.review-card p{color:var(--muted);font-size:15px;line-height:1.7}
.rv-meta{margin-top:16px;display:flex;align-items:center;gap:10px}
.rv-meta strong{font-size:14px;color:var(--ink, #eef1ff)}
.rv-meta span{font-size:12px;color:var(--muted);background:var(--bg-3);padding:3px 10px;border-radius:12px}