/* ============================================================
   司机社官网 · 共享设计系统  styles.css
   主题：夜行公路 Night Highway
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  /* 基础色 */
  --bg:#070912;
  --bg-2:#0b0e1c;
  --bg-3:#111528;
  --surface:rgba(255,255,255,.04);
  --surface-2:rgba(255,255,255,.06);
  --surface-3:rgba(255,255,255,.09);
  --border:rgba(255,255,255,.09);
  --border-2:rgba(255,255,255,.16);

  /* 文本 */
  --text:#f4f6ff;
  --text-dim:#a4abc9;
  --text-mute:#6b7191;

  /* 品牌 */
  --primary:#ff7a3d;       /* 琥珀橙 - 驾驶能量 */
  --primary-2:#ff9d5c;
  --primary-deep:#e8541a;
  --accent:#2dd4bf;        /* 电光青 - AI 科技 */
  --accent-2:#22d3ee;
  --violet:#8b5cf6;
  --pink:#ff3d7f;

  /* 渐变 */
  --grad-hero:linear-gradient(120deg,#ff7a3d 0%,#ff3d7f 45%,#8b5cf6 100%);
  --grad-accent:linear-gradient(120deg,#2dd4bf 0%,#22d3ee 100%);
  --grad-primary:linear-gradient(120deg,#ff9d5c 0%,#ff7a3d 100%);
  --grad-text:linear-gradient(120deg,#ffb088 0%,#ff7a3d 40%,#ff3d7f 100%);
  --grad-dark:linear-gradient(180deg,rgba(7,9,18,0) 0%,#070912 60%);

  /* 圆角 */
  --r-sm:10px; --r:16px; --r-lg:22px; --r-xl:30px; --r-pill:999px;

  /* 阴影 */
  --shadow:0 10px 40px -10px rgba(0,0,0,.6);
  --shadow-glow:0 0 40px -8px rgba(255,122,61,.5);
  --shadow-accent:0 0 40px -8px rgba(45,212,191,.45);

  /* 字体 */
  --ff-display:"Sora","PingFang SC","Microsoft YaHei",sans-serif;
  --ff-body:"Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --ff-mono:"JetBrains Mono","SF Mono",Consolas,monospace;

  /* 布局 */
  --maxw:1200px;
  --nav-h:72px;
}

/* ---------- 重置 ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--ff-body);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  font-size:16px;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul{list-style:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}

/* ---------- 全局背景氛围 ---------- */
.bg-fx{position:fixed;inset:0;z-index:-2;pointer-events:none;overflow:hidden}
.bg-fx::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(900px 600px at 78% -8%,rgba(255,61,127,.18),transparent 60%),
    radial-gradient(800px 600px at 12% 8%,rgba(45,212,191,.12),transparent 60%),
    radial-gradient(700px 500px at 50% 110%,rgba(139,92,246,.14),transparent 60%),
    var(--bg);
}
.bg-fx::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(circle at 50% 40%,#000 0%,transparent 75%);
  -webkit-mask-image:radial-gradient(circle at 50% 40%,#000 0%,transparent 75%);
}
.blob{position:fixed;border-radius:50%;filter:blur(80px);z-index:-1;pointer-events:none;opacity:.5}

/* ---------- 容器 ---------- */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:96px 0;position:relative}
.section-sm{padding:64px 0}

/* ---------- 渐变文字 ---------- */
.grad-text{
  background:var(--grad-text);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}
.grad-hero{
  background:var(--grad-hero);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}
.grad-accent{
  background:var(--grad-accent);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}

/* ---------- 标题排版 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--ff-display);font-size:.78rem;font-weight:600;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent);
  padding:6px 14px;border-radius:var(--r-pill);
  background:rgba(45,212,191,.08);border:1px solid rgba(45,212,191,.25);
}
.eyebrow.warm{color:var(--primary);background:rgba(255,122,61,.08);border-color:rgba(255,122,61,.25)}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:currentColor;box-shadow:0 0 10px currentColor}

h1,h2,h3,h4{font-family:var(--ff-display);font-weight:700;line-height:1.15;letter-spacing:-.01em}
.h-display{font-size:clamp(2.6rem,6vw,4.6rem);line-height:1.05}
.h1{font-size:clamp(2rem,4.5vw,3.2rem)}
.h2{font-size:clamp(1.6rem,3.5vw,2.4rem)}
.h3{font-size:clamp(1.2rem,2.4vw,1.6rem)}
.lead{font-size:clamp(1rem,1.6vw,1.18rem);color:var(--text-dim);line-height:1.75}
.section-head{max-width:680px;margin-bottom:56px}
.section-head .lead{margin-top:18px}
.center{text-align:center;margin-left:auto;margin-right:auto}
.center .section-head{margin-left:auto;margin-right:auto}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-family:var(--ff-display);font-weight:600;font-size:.98rem;
  padding:14px 26px;border-radius:var(--r-pill);
  transition:transform .25s cubic-bezier(.2,.8,.2,1),box-shadow .25s,background .25s;
  white-space:nowrap;line-height:1;
}
.btn svg{width:18px;height:18px}
.btn-primary{
  background:var(--grad-primary);color:#1a0f08;
  box-shadow:var(--shadow-glow);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 50px -8px rgba(255,122,61,.65)}
.btn-ghost{background:var(--surface);color:var(--text);border:1px solid var(--border-2)}
.btn-ghost:hover{transform:translateY(-3px);background:var(--surface-2);border-color:var(--accent)}
.btn-accent{background:var(--grad-accent);color:#04221f;box-shadow:var(--shadow-accent)}
.btn-accent:hover{transform:translateY(-3px);box-shadow:0 14px 50px -8px rgba(45,212,191,.6)}
.btn-dark{background:#15182a;color:var(--text);border:1px solid var(--border)}
.btn-dark:hover{background:#1c2038;transform:translateY(-3px)}
.btn-lg{padding:17px 34px;font-size:1.05rem}
.btn-sm{padding:10px 18px;font-size:.85rem}

/* ---------- 导航栏 ---------- */
.nav{
  position:sticky;top:0;z-index:100;
  height:var(--nav-h);
  display:flex;align-items:center;
  background:rgba(7,9,18,.72);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid transparent;
  transition:border-color .3s,background .3s;
}
.nav.scrolled{border-bottom-color:var(--border);background:rgba(7,9,18,.88)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--ff-display);font-weight:700;font-size:1.2rem}
.brand .logo{
  width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
  background:var(--grad-hero);box-shadow:var(--shadow-glow);
  font-size:1.1rem;
}
.brand .logo svg{width:22px;height:22px}
.brand span{background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.brand small{display:block;font-size:.62rem;font-weight:500;color:var(--text-mute);letter-spacing:.1em;-webkit-text-fill-color:var(--text-mute)}

.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{
  font-size:.92rem;font-weight:500;color:var(--text-dim);
  padding:9px 16px;border-radius:var(--r-pill);transition:color .2s,background .2s;
}
.nav-links a:hover{color:var(--text);background:var(--surface)}
.nav-links a.active{color:var(--text);background:var(--surface-2)}
.nav-actions{display:flex;align-items:center;gap:10px}

.nav-toggle{display:none;width:42px;height:42px;border-radius:11px;align-items:center;justify-content:center;background:var(--surface);border:1px solid var(--border)}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--text);border-radius:2px;position:relative;transition:.3s}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:20px;height:2px;background:var(--text);border-radius:2px;transition:.3s}
.nav-toggle span::before{top:-6px}.nav-toggle span::after{top:6px}
.nav-toggle.open span{background:transparent}
.nav-toggle.open span::before{top:0;transform:rotate(45deg)}
.nav-toggle.open span::after{top:0;transform:rotate(-45deg)}

/* ---------- 卡片 ---------- */
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:32px;transition:transform .3s cubic-bezier(.2,.8,.2,1),border-color .3s,background .3s;
  position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-6px);border-color:var(--border-2);background:var(--surface-2)}
.card-icon{
  width:56px;height:56px;border-radius:15px;display:grid;place-items:center;margin-bottom:22px;
  font-size:1.5rem;
}
.card-icon.warm{background:rgba(255,122,61,.12);color:var(--primary)}
.card-icon.cool{background:rgba(45,212,191,.12);color:var(--accent)}
.card-icon.violet{background:rgba(139,92,246,.12);color:var(--violet)}
.card-icon.pink{background:rgba(255,61,127,.12);color:var(--pink)}
.card h3{margin-bottom:12px}
.card p{color:var(--text-dim);font-size:.96rem}

.glass{
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.09);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-radius:var(--r-lg);
}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* ---------- 统计 ---------- */
.stats{display:flex;gap:48px;flex-wrap:wrap}
.stat .num{font-family:var(--ff-display);font-size:clamp(2rem,4vw,3rem);font-weight:800;line-height:1;background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat .lbl{font-size:.85rem;color:var(--text-mute);margin-top:8px}

/* ---------- 视频卡片（社区） ---------- */
.vcard{
  border-radius:var(--r-lg);overflow:hidden;cursor:pointer;position:relative;
  border:1px solid var(--border);background:var(--surface);
  transition:transform .3s cubic-bezier(.2,.8,.2,1),box-shadow .3s,border-color .3s;
}
.vcard:hover{transform:translateY(-6px);border-color:var(--border-2);box-shadow:var(--shadow)}
.vthumb{aspect-ratio:9/16;position:relative;overflow:hidden;display:grid;place-items:center}
.vthumb .ph{position:absolute;inset:0}
.vthumb .badge{position:absolute;top:12px;left:12px;font-size:.7rem;font-weight:600;padding:5px 10px;border-radius:var(--r-pill);background:rgba(0,0,0,.55);backdrop-filter:blur(8px);color:#fff;z-index:2}
.vthumb .badge.hot{background:var(--grad-primary);color:#1a0f08}
.vthumb .play{position:absolute;inset:0;display:grid;place-items:center;z-index:3;opacity:0;transition:opacity .3s}
.vcard:hover .play{opacity:1}
.vthumb .play .pbtn{width:60px;height:60px;border-radius:50%;background:rgba(7,9,18,.7);backdrop-filter:blur(10px);display:grid;place-items:center;border:2px solid rgba(255,255,255,.4)}
.vthumb .play svg{width:24px;height:24px;color:#fff;margin-left:3px}
.vthumb .dur{position:absolute;bottom:12px;right:12px;font-size:.72rem;font-weight:600;padding:3px 9px;border-radius:6px;background:rgba(0,0,0,.65);color:#fff;z-index:2;font-family:var(--ff-mono)}
.vbody{padding:16px}
.vbody .title{font-weight:600;font-size:.96rem;line-height:1.4;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.vmeta{display:flex;align-items:center;gap:8px;font-size:.78rem;color:var(--text-mute)}
.vmeta .avatar{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:.7rem;font-weight:700;background:var(--grad-accent);color:#04221f}
.vmeta .dot{width:3px;height:3px;border-radius:50%;background:var(--text-mute)}

/* 视频缩略图渐变占位 */
.ph-1{background:linear-gradient(135deg,#ff7a3d,#ff3d7f)}
.ph-2{background:linear-gradient(135deg,#2dd4bf,#22d3ee)}
.ph-3{background:linear-gradient(135deg,#8b5cf6,#ff3d7f)}
.ph-4{background:linear-gradient(135deg,#22d3ee,#8b5cf6)}
.ph-5{background:linear-gradient(135deg,#ff9d5c,#ff7a3d)}
.ph-6{background:linear-gradient(135deg,#1e3a5f,#2dd4bf)}
.ph-7{background:linear-gradient(135deg,#ff3d7f,#8b5cf6)}
.ph-8{background:linear-gradient(135deg,#2dd4bf,#0ea5e9)}
.ph-label{position:relative;z-index:1;font-family:var(--ff-display);font-weight:800;font-size:1.3rem;color:rgba(255,255,255,.85);text-shadow:0 2px 20px rgba(0,0,0,.3)}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--border);padding:64px 0 32px;margin-top:64px;background:linear-gradient(180deg,transparent,rgba(11,14,28,.6))}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;margin-bottom:48px}
.footer h4{font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;color:var(--text-mute);margin-bottom:18px;font-weight:600}
.footer ul li{margin-bottom:11px}
.footer ul a{font-size:.9rem;color:var(--text-dim);transition:color .2s}
.footer ul a:hover{color:var(--accent)}
.footer-brand p{color:var(--text-dim);font-size:.9rem;margin-top:16px;max-width:320px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:28px;border-top:1px solid var(--border);font-size:.82rem;color:var(--text-mute);flex-wrap:wrap;gap:12px}
.footer-bottom .seo-links{display:flex;gap:18px;flex-wrap:wrap}
.footer-bottom .seo-links a{color:var(--text-mute)}
.footer-bottom .seo-links a:hover{color:var(--accent)}

/* ---------- 通用工具 ---------- */
.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}
.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}.gap-24{gap:24px}
.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}.mt-48{margin-top:48px}
.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.mb-32{margin-bottom:32px}.mb-48{margin-bottom:48px}
.text-dim{color:var(--text-dim)}.text-mute{color:var(--text-mute)}.text-center{text-align:center}
.badge-tag{display:inline-block;font-size:.72rem;font-weight:600;padding:4px 10px;border-radius:var(--r-pill);background:var(--surface-2);color:var(--text-dim);border:1px solid var(--border)}

/* ---------- 滚动揭示动画 ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.2,.8,.2,1),transform .7s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:980px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links{
    position:fixed;top:var(--nav-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(7,9,18,.97);backdrop-filter:blur(20px);
    border-bottom:1px solid var(--border);
    padding:12px 20px 24px;
    transform:translateY(-130%);transition:transform .4s cubic-bezier(.2,.8,.2,1);
    max-height:calc(100vh - var(--nav-h));overflow-y:auto;
  }
  .nav-links.open{transform:translateY(0)}
  .nav-links a{padding:14px 16px;font-size:1rem;border-radius:12px}
  .nav-links a.active{background:var(--surface)}
  .nav-toggle{display:flex}
  .nav-actions .btn-ghost{display:none}
  .section{padding:72px 0}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .stats{gap:32px}
  .container{padding:0 20px}
}
@media(max-width:480px){
  .btn{padding:13px 22px;font-size:.92rem}
  .btn-lg{padding:15px 26px}
}