/* =========================================================================
   纸飞机 telegram-aa.com.cn —— 「纸飞机 · 折光夜航」Prism Night Flight
   深色 · 玻璃拟态 · 影院级:深空墨底 + 月光白正文 + 电光青/靛紫 + 纸飞机金
   全屏虚化照片背景 + 非对称编辑部式排版
   ========================================================================= */

:root{
  --bg:#0a0d18;            /* 深空墨底 */
  --bg-2:#0e1424;          /* 深蓝黑 */
  --bg-3:#131a2e;          /* 稍亮面板底 */
  --ink:#eaf0ff;           /* 月光白正文 */
  --muted:#9aa5c4;         /* 次级灰蓝 */
  --muted-2:#6b7694;       /* 更淡 */
  --cyan:#38bdf8;          /* 电光青(消息信号) */
  --violet:#818cf8;        /* 靛紫(信任渐变) */
  --gold:#fbbf24;          /* 纸飞机金(主按钮/折纸光) */
  --gold-deep:#f59e0b;
  --panel:rgba(255,255,255,.06);       /* 玻璃面板 */
  --panel-strong:rgba(20,27,46,.72);   /* 深玻璃面板 */
  --border:rgba(255,255,255,.10);
  --border-soft:rgba(255,255,255,.06);
  --grad:linear-gradient(120deg,#38bdf8 0%,#818cf8 100%);
  --grad-soft:linear-gradient(135deg,#38bdf8 0%,#818cf8 60%,#c4b5fd 100%);
  --shadow:0 12px 40px rgba(0,0,0,.45);
  --shadow-lg:0 24px 70px rgba(0,0,0,.6);
  --glow-cyan:0 0 0 1px rgba(56,189,248,.35),0 8px 30px rgba(56,189,248,.25);
  --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","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--cyan);text-decoration:none}
a:hover{color:#7dd3fc}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------------- 顶部导航(极简:左徽章+右文字链接+金按钮) ---------------- */
.site-nav{
  position:sticky;top:0;z-index:100;
  background:rgba(10,13,24,.72);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border-soft);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.nav-logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand-ico{width:38px;height:38px;border-radius:9px;flex-shrink:0}
.nav-word{font-size:19px;font-weight:800;color:var(--ink);letter-spacing:.5px}
.nav-links{display:flex;align-items:center;gap:6px}
.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:hover{color:var(--ink);background:rgba(255,255,255,.05)}
.nav-item.on{color:var(--ink)}
.nav-item.on::after{content:"";position:absolute;left:14px;right:14px;bottom:3px;height:2px;border-radius:2px;background:var(--grad)}
.nav-top{display:inline-flex;align-items:center;gap:5px;color:inherit;font-weight:inherit}
.caret{font-size:9px;opacity:.7;transition:transform .2s}
.has-sub:hover .caret,.has-sub:focus-within .caret{transform:rotate(180deg)}
.nav-menu{
  position:absolute;top:calc(100% + 10px);right:0;min-width:190px;padding:7px;
  background:rgba(20,27,46,.92);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-lg);
  opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .18s,transform .18s,visibility .18s;z-index:120;
}
.nav-menu::before{content:"";position:absolute;top:-10px;left:0;right:0;height:10px}
.has-sub:hover .nav-menu,.has-sub:focus-within .nav-menu{opacity:1;visibility:visible;transform:translateY(0)}
.nav-sub-item{display:block;padding:9px 14px;border-radius:9px;font-size:14px;color:var(--muted);font-weight:500;white-space:nowrap}
.nav-sub-item:hover{color:var(--ink);background:rgba(56,189,248,.10)}
.nav-cta{
  flex-shrink:0;padding:9px 20px;border-radius:11px;font-size:14px;font-weight:800;color:#241a03;
  background:var(--gold);box-shadow:0 6px 20px rgba(251,191,36,.30);
  transition:transform .15s,box-shadow .15s,background .15s;
}
.nav-cta:hover{color:#241a03;background:#fcd34d;transform:translateY(-1px);box-shadow:0 10px 26px rgba(251,191,36,.42)}

/* ---------------- 按钮(金实底 + 玻璃描边) ---------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 30px;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;transition:all .18s;line-height:1.2}
.btn-primary{background:var(--gold);color:#241a03;box-shadow:0 10px 30px rgba(251,191,36,.30)}
.btn-primary:hover{color:#241a03;background:#fcd34d;transform:translateY(-2px);box-shadow:0 16px 40px rgba(251,191,36,.42)}
.btn-ghost{border:1px solid var(--border);color:var(--ink);background:rgba(255,255,255,.04);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.btn-ghost:hover{color:var(--cyan);border-color:rgba(56,189,248,.5);background:rgba(56,189,248,.08)}
.btn-link{position:relative;color:var(--cyan);font-weight:600;padding:12px 2px;font-size:16px}
.btn-link::after{content:"";position:absolute;left:0;bottom:8px;width:100%;height:2px;border-radius:2px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .22s}
.btn-link:hover{color:#7dd3fc}
.btn-link:hover::after{transform:scaleX(1)}

/* ---------------- 全屏虚化 hero ---------------- */
.hero{position:relative;min-height:86vh;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:blur(2px) brightness(.5) saturate(1.1);transform:scale(1.04)}
.hero-overlay{position:absolute;inset:0;background:
  linear-gradient(100deg,rgba(10,13,24,.94) 0%,rgba(10,13,24,.72) 46%,rgba(10,13,24,.30) 100%),
  radial-gradient(900px 500px at 80% 20%,rgba(56,189,248,.16),transparent 60%);
}
.hero-inner{position:relative;z-index:2;padding:90px 0;max-width:640px}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border-radius:999px;font-size:13px;font-weight:600;color:var(--cyan);
  background:rgba(56,189,248,.10);border:1px solid rgba(56,189,248,.28);margin-bottom:22px}
.hero-eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.hero-title{font-size:58px;line-height:1.08;font-weight:800;color:var(--ink);letter-spacing:1px;margin-bottom:20px}
.hero-title em{font-style:normal;background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:18px;color:var(--muted);margin-bottom:32px;max-width:560px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-plats{display:flex;gap:10px;flex-wrap:wrap;margin-top:30px}
.hero-plats span{font-size:12px;color:var(--muted-2);padding:5px 13px;border-radius:999px;border:1px solid var(--border);background:rgba(255,255,255,.03)}
.hero-plane{position:absolute;right:8%;top:18%;z-index:2;width:180px;color:var(--cyan);opacity:.9;
  filter:drop-shadow(0 0 24px rgba(56,189,248,.5));animation:planeFloat 7s ease-in-out infinite}
.hero-plane svg{width:100%;height:auto}
@keyframes planeFloat{0%,100%{transform:translateY(0) rotate(-6deg)}50%{transform:translateY(-16px) rotate(2deg)}}

/* ---------------- 飞信轨道招牌条(玻璃) ---------------- */
.flight{padding:0 24px;margin-top:-2px}
.flight-card{
  max-width:var(--max);margin:0 auto;position:relative;
  background:var(--panel-strong);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);
  border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow-lg);
  padding:36px 40px;overflow:hidden;
}
.flight-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad)}
.flight-head{text-align:center;margin-bottom:26px}
.flight-head .kicker{color:var(--cyan)}
.flight-track{display:flex;align-items:center;gap:14px;justify-content:center}
.flight-node{display:flex;flex-direction:column;align-items:center;gap:8px;min-width:64px}
.flight-dot{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:17px;font-weight:700}
.flight-node.a .flight-dot{background:rgba(56,189,248,.16);color:var(--cyan);border:1px solid rgba(56,189,248,.4);box-shadow:0 0 0 4px rgba(56,189,248,.08)}
.flight-node.b .flight-dot{background:rgba(251,191,36,.14);color:var(--gold);border:1px solid rgba(251,191,36,.4);box-shadow:0 0 0 4px rgba(251,191,36,.08)}
.flight-label{font-size:12px;color:var(--muted)}
.flight-line{flex:1;display:flex;align-items:center;gap:6px;position:relative;min-width:56px}
.flight-line .seg{flex:1;height:0;border-top:2px dashed rgba(56,189,248,.4)}
.flight-plane{width:34px;color:var(--gold);filter:drop-shadow(0 0 12px rgba(251,191,36,.5));flex-shrink:0}
.flight-plane svg{width:100%;height:auto}
.flight-note{text-align:center;margin-top:22px;font-size:13px;color:var(--muted-2)}
.flight-note b{color:var(--cyan);font-weight:600}

/* ---------------- 通用 section(非对称) ---------------- */
.section{padding:88px 0;background:var(--bg)}
.section.alt{background:var(--bg-2)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:46px}
.sec-head .left{max-width:640px}
.kicker{display:inline-block;font-size:12px;font-weight:700;letter-spacing:3px;text-transform:uppercase;color:var(--cyan);margin-bottom:12px}
.sec-title{font-size:34px;font-weight:800;color:var(--ink);letter-spacing:.5px;line-height:1.2}
.sec-sub{font-size:15px;color:var(--muted);margin-top:12px}
.sec-more{align-self:center;flex-shrink:0}

/* ---------------- 编辑部式功能块(幽灵数字 + 图/文交替) ---------------- */
.feat-row{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:40px 0}
.feat-row + .feat-row{border-top:1px solid var(--border-soft)}
.feat-copy{position:relative}
.feat-num{position:absolute;top:-28px;left:-6px;font-size:96px;font-weight:800;line-height:1;color:transparent;
  -webkit-text-stroke:1px rgba(56,189,248,.18);font-family:Georgia,serif;z-index:0;pointer-events:none}
.feat-copy h3{font-size:26px;font-weight:800;color:var(--ink);margin-bottom:14px;position:relative;z-index:1}
.feat-copy p{font-size:15px;color:var(--muted);margin-bottom:16px;position:relative;z-index:1}
.feat-copy .btn-link{position:relative;z-index:1}
.feat-media{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg);aspect-ratio:16/10}
.feat-media img{width:100%;height:100%;object-fit:cover}
.feat-media::after{content:"";position:absolute;inset:0;background:linear-gradient(160deg,rgba(56,189,248,.12),transparent 50%)}
.feat-media .tag{position:absolute;left:16px;bottom:14px;z-index:2;font-size:12px;font-weight:700;color:var(--ink);
  padding:6px 14px;border-radius:999px;background:rgba(10,13,24,.72);backdrop-filter:blur(8px);border:1px solid var(--border)}
.feat-row.rev .feat-media{order:-1}

/* ---------------- 平台横向滚动 rail ---------------- */
.rail-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:28px}
.rail-track{display:flex;gap:18px;overflow-x:auto;padding:8px 4px 20px;scroll-snap-type:x mandatory}
.rail-track::-webkit-scrollbar{height:8px}
.rail-track::-webkit-scrollbar-thumb{background:rgba(255,255,255,.12);border-radius:99px}
.rail-card{
  flex:0 0 210px;scroll-snap-align:start;
  background:var(--panel);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border:1px solid var(--border);border-radius:var(--radius);padding:26px 22px;
  transition:transform .2s,border-color .2s,box-shadow .2s;
}
.rail-card:hover{transform:translateY(-5px);border-color:rgba(56,189,248,.45);box-shadow:var(--glow-cyan)}
.rail-card .ico{font-size:34px;margin-bottom:14px}
.rail-card h3{font-size:17px;font-weight:700;color:var(--ink);margin-bottom:6px}
.rail-card p{font-size:12px;color:var(--muted-2);margin-bottom:16px}
.rail-card .go{font-size:13px;font-weight:700;color:var(--cyan)}

/* ---------------- 大字数据行(无渐变带) ---------------- */
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.stat-item{text-align:center;padding:44px 20px;position:relative}
.stat-item + .stat-item{border-left:1px solid var(--border)}
.stat-num{font-size:52px;font-weight:800;line-height:1;background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent;font-family:Georgia,serif}
.stat-label{font-size:13px;color:var(--muted);margin-top:10px;letter-spacing:1px}

/* ---------------- 全屏虚化 CTA 带 ---------------- */
.cta-band{position:relative;padding:110px 24px;overflow:hidden;text-align:center}
.cta-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:blur(3px) brightness(.42) saturate(1.15);transform:scale(1.05)}
.cta-overlay{position:absolute;inset:0;background:radial-gradient(800px 400px at 50% 20%,rgba(56,189,248,.16),transparent 60%),rgba(10,13,24,.55)}
.cta-inner{position:relative;z-index:2;max-width:640px;margin:0 auto}
.cta-title{font-size:40px;font-weight:800;color:var(--ink);margin-bottom:14px;letter-spacing:1px}
.cta-sub{font-size:16px;color:var(--muted);margin-bottom:30px}

/* ---------------- 页脚 ---------------- */
.site-foot{background:#070910;border-top:1px solid var(--border-soft);position:relative;overflow:hidden}
.site-foot::before{content:"";position:absolute;top:-1px;left:0;right:0;height:2px;background:var(--grad);opacity:.6}
.foot-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:30px 24px;flex-wrap:wrap}
.foot-brand{font-size:16px;font-weight:700;color:var(--ink)}
.foot-brand em{font-style:normal;font-size:13px;font-weight:400;color:var(--muted-2);margin-left:8px}
.foot-copy{font-size:13px;color:var(--muted-2)}

/* ---------------- 返回顶部 ---------------- */
.backtop{
  position:fixed;right:26px;bottom:26px;width:48px;height:48px;border-radius:14px;
  border:1px solid var(--border);background:var(--panel-strong);backdrop-filter:blur(16px);color:var(--cyan);font-size:20px;cursor:pointer;
  box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(10px);transition:all .25s;z-index:90;
}
.backtop.show{opacity:1;visibility:visible;transform:translateY(0)}

/* ---------------- 子页 hero(暗色 + 淡虚化) ---------------- */
.page-hero{position:relative;padding:64px 0 48px;overflow:hidden;background:
  radial-gradient(900px 420px at 85% -10%,rgba(56,189,248,.12),transparent 55%),
  radial-gradient(700px 400px at 5% 120%,rgba(129,140,248,.12),transparent 55%),var(--bg)}
.page-title{font-size:38px;font-weight:800;color:var(--ink);margin:14px 0 10px;letter-spacing:.5px}
.page-lead{font-size:16px;color:var(--muted);max-width:760px}
.article-meta{display:flex;gap:18px;flex-wrap:wrap;align-items:center;margin-top:20px;font-size:13px;color:var(--muted)}
.article-meta b{color:var(--ink)}

/* ---------------- 面包屑 ---------------- */
.crumb{font-size:13px;color:var(--muted-2);margin-bottom:6px}
.crumb a{color:var(--muted-2)}
.crumb a:hover{color:var(--cyan)}
.crumb .sep{color:var(--muted-2);margin:0 7px}

/* ---------------- 左右图文 split ---------------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.split-media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg);aspect-ratio:16/10}
.split-media img{width:100%;height:100%;object-fit:cover}
.split-body h2{font-size:26px;font-weight:800;color:var(--ink);margin:8px 0 14px}
.split-body p{font-size:15px;color:var(--muted);margin-bottom:10px}
.split-body .kicker{color:var(--cyan)}

/* ---------------- 步骤 ---------------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px}
.step{background:var(--panel);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:var(--radius);padding:26px 22px;position:relative}
.step h3{font-size:16px;font-weight:700;color:var(--cyan);margin-bottom:8px}
.step p{font-size:14px;color:var(--muted)}

/* ---------------- 表格 ---------------- */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;background:var(--panel-strong);font-size:14px;color:var(--ink)}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--border-soft)}
thead th{background:rgba(56,189,248,.08);color:var(--cyan);font-weight:700}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover td{background:rgba(56,189,248,.05)}

/* ---------------- 提示框 / 警示框 ---------------- */
.tip{background:rgba(56,189,248,.08);border-left:3px solid var(--cyan);border-radius:10px;padding:14px 18px;margin:16px 0}
.tip p{font-size:14px;color:var(--ink)}
.callout{background:rgba(251,191,36,.10);border-left:3px solid var(--gold);border-radius:10px;padding:14px 18px;margin:16px 0}
.callout p{font-size:14px;color:var(--ink)}
blockquote{background:var(--panel);border-left:3px solid var(--violet);border-radius:10px;padding:14px 18px;margin:16px 0;font-size:15px;color:var(--ink)}

/* ---------------- 正文 prose ---------------- */
.prose h2{font-size:23px;font-weight:800;color:var(--ink);margin:32px 0 14px;padding-left:14px;border-left:3px solid var(--cyan)}
.prose p{font-size:15px;color:#cdd5ea;margin-bottom:14px;line-height:1.95}
.prose ul,.prose ol{margin:0 0 16px 22px;font-size:15px;color:#cdd5ea;line-height:1.9}
.prose li{margin-bottom:8px}
.prose figure{margin:20px 0}
.prose figure img{border-radius:var(--radius);width:100%}
.prose figcaption{font-size:13px;color:var(--muted-2);text-align:center;margin-top:8px}
.lead-fig{margin:0 0 8px}
.lead-fig img{border-radius:var(--radius);width:100%;box-shadow:var(--shadow)}

/* ---------------- 文章双栏 + 粘性目录 ---------------- */
.article-layout{display:grid;grid-template-columns:250px 1fr;gap:44px;align-items:start}
.toc{position:sticky;top:86px;background:var(--panel);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.toc h4{font-size:13px;font-weight:700;color:var(--muted-2);margin-bottom:12px;letter-spacing:1px}
.toc a{display:block;font-size:13px;color:var(--muted);padding:6px 0;border-bottom:1px dashed var(--border-soft)}
.toc a:last-child{border-bottom:none}
.toc a:hover{color:var(--cyan)}

/* ---------------- 相关卡片 ---------------- */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.rel-card{background:var(--panel);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:transform .2s,border-color .2s}
.rel-card:hover{transform:translateY(-4px);border-color:rgba(56,189,248,.45)}
.rel-card .t{font-size:15px;font-weight:700;color:var(--ink);margin-bottom:6px}
.rel-card .d{font-size:13px;color:var(--muted-2)}

/* ---------------- FAQ ---------------- */
.faq-block{border-top:1px solid var(--border)}
.faq-item{border-bottom:1px solid var(--border);background:var(--panel-strong)}
.faq-item summary{list-style:none;cursor:pointer;padding:18px 16px;font-size:16px;font-weight:600;color:var(--ink);position:relative;padding-right:40px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);font-size:22px;color:var(--cyan);font-weight:400}
.faq-item[open] summary::after{content:"−"}
.faq-item .a{padding:0 16px 18px;font-size:14px;color:var(--muted)}
.faq-group{margin-bottom:28px}
.faq-group h2{font-size:20px;font-weight:800;color:var(--ink);margin-bottom:14px}
.faq-group details{border:1px solid var(--border);border-radius:12px;margin-bottom:10px;background:var(--panel-strong);overflow:hidden}
.faq-group summary{list-style:none;cursor:pointer;padding:15px 18px;font-size:15px;font-weight:600;color:var(--ink);position:relative;padding-right:44px}
.faq-group summary::-webkit-details-marker{display:none}
.faq-group summary::after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:20px;color:var(--cyan)}
.faq-group details[open] summary::after{content:"−"}
.faq-group .a{padding:0 18px 16px;font-size:14px;color:var(--muted)}

/* ---------------- 404 / 搜索 ---------------- */
.notfound{text-align:center;padding:40px 0}
.notfound .big{font-size:88px;font-weight:800;letter-spacing:8px;background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:10px}
.notfound p{color:var(--muted);margin-bottom:24px}
.search-box{display:flex;gap:12px;max-width:540px;margin:20px auto 0}
.search-input{flex:1;padding:13px 18px;border:1px solid var(--border);border-radius:12px;font-size:15px;outline:none;background:var(--panel);color:var(--ink)}
.search-input:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(56,189,248,.14)}
.search-input::placeholder{color:var(--muted-2)}

/* ---------------- 响应式 ---------------- */
@media (max-width:960px){
  .hero{min-height:70vh}
  .hero-title{font-size:42px}
  .hero-plane{width:120px;right:4%;opacity:.5}
  .feat-row{grid-template-columns:1fr;gap:28px;padding:30px 0}
  .feat-row.rev .feat-media{order:0}
  .stats-row{grid-template-columns:repeat(2,1fr)}
  .stat-item:nth-child(3){border-left:none}
  .stat-item:nth-child(n+3){border-top:1px solid var(--border)}
  .split,.article-layout{grid-template-columns:1fr}
  .toc{position:static}
  .steps{grid-template-columns:1fr}
  .rel-grid{grid-template-columns:repeat(2,1fr)}
  .sec-head{flex-direction:column;align-items:flex-start;gap:12px}
  .nav-links{display:none}
}
@media (max-width:600px){
  .hero-title{font-size:32px}
  .hero-sub{font-size:16px}
  .flight-card{padding:26px 18px}
  .flight-track{flex-direction:column;gap:10px}
  .flight-line{width:2px;height:26px;flex-direction:column}
  .flight-line .seg{width:0;height:100%;border-left:2px dashed rgba(56,189,248,.4);border-top:none}
  .rail-card{flex-basis:170px}
  .stats-row{grid-template-columns:1fr 1fr}
  .stat-num{font-size:40px}
  .cta-title{font-size:30px}
  .sec-title{font-size:26px}
  .page-title{font-size:30px}
  .section{padding:56px 0}
  .feat-num{font-size:64px;top:-16px}
}

/* ===== 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}