/* ============ VideoNote 授权销售系统 - 前台样式（蓝白主题 / 响应式） ============ */
:root{
  --blue:#2563eb; --blue-d:#1d4ed8; --blue-l:#eff6ff;
  --bg:#f8fafc; --card:#ffffff; --line:#e2e8f0;
  --txt:#0f172a; --txt2:#475569; --txt3:#94a3b8;
  --ok:#16a34a; --warn:#d97706; --danger:#dc2626;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--txt);line-height:1.7;font-size:15px}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-d)}
img{max-width:100%}

/* ===== 顶部导航 ===== */
.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:100}
.nav-in{max-width:1080px;margin:0 auto;padding:0 20px;height:60px;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:19px;font-weight:800;color:var(--txt);display:flex;align-items:center;gap:8px}
.logo .dot{width:10px;height:10px;border-radius:3px;background:var(--blue);display:inline-block}
.logo .logo-img{height:28px;width:auto;max-width:150px;object-fit:contain;display:block}
.nav-links{display:flex;align-items:center;gap:22px;font-size:14px}
.nav-links a{color:var(--txt2)}
.nav-links a:hover{color:var(--blue)}
.btn{display:inline-block;background:var(--blue);color:#fff!important;border-radius:8px;padding:7px 18px;font-size:14px;border:none;cursor:pointer;transition:background .15s}
.btn:hover{background:var(--blue-d)}
.btn-sm{padding:5px 13px;font-size:13px}
.btn-ghost{background:#fff;color:var(--blue)!important;border:1px solid var(--blue)}
.btn-ghost:hover{background:var(--blue-l)}
.btn-danger{background:#fff;color:var(--danger)!important;border:1px solid #fecaca}
.btn-danger:hover{background:#fef2f2}
.btn-dark{background:#0f172a;color:#fff!important}
.btn-dark:hover{background:#1e293b}
.btn-lg{padding:13px 34px;font-size:16px;border-radius:10px}
.btn-block{display:block;width:100%;text-align:center}

/* ===== 通用容器 ===== */
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
section{padding:64px 0}
.sec-title{font-size:27px;font-weight:800;text-align:center;margin-bottom:8px}
.sec-sub{text-align:center;color:var(--txt2);font-size:15px;margin-bottom:38px}

/* ===== Hero ===== */
.hero{background:linear-gradient(180deg,#eff6ff 0%,#f8fafc 100%);text-align:center;padding:84px 20px 70px}
.hero h1{font-size:44px;font-weight:900;line-height:1.25;letter-spacing:-.5px}
.hero h1 .grad{background:linear-gradient(90deg,#2563eb,#7c3aed);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--txt2);font-size:17px;max-width:620px;margin:18px auto 28px}
.hero .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-tags{margin-top:26px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.tag{background:#fff;border:1px solid var(--line);color:var(--txt2);border-radius:20px;padding:4px 14px;font-size:13px}
.hero-shot{margin:44px auto 0;max-width:860px;border-radius:14px;box-shadow:0 24px 60px -18px rgba(15,23,42,.28);border:1px solid var(--line);overflow:hidden}
.hero-shot .bar{background:#0f172a;color:#cbd5e1;font-size:12px;padding:8px 14px;display:flex;gap:8px;align-items:center}
.hero-shot .bar i{width:10px;height:10px;border-radius:50%;display:inline-block}
.hero-shot .screen{background:#fff;padding:0;min-height:220px;display:flex;align-items:center;justify-content:center;color:var(--txt3);font-size:14px}

/* ===== 功能 ===== */
.feats{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px}
.feat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px 22px;transition:box-shadow .2s,transform .2s}
.feat:hover{box-shadow:0 14px 34px -12px rgba(15,23,42,.15);transform:translateY(-3px)}
.feat .ico{width:46px;height:46px;border-radius:12px;background:var(--blue-l);color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:14px}
.feat h3{font-size:16px;margin-bottom:6px}
.feat p{color:var(--txt2);font-size:13.5px}

/* ===== 价格 ===== */
.pricing{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;max-width:900px;margin:0 auto}
.plan{background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:30px 26px;text-align:center;position:relative;transition:transform .2s}
.plan:hover{transform:translateY(-4px)}
.plan.hot{border:2px solid var(--blue);background:#fff;box-shadow:0 18px 40px -16px rgba(37,99,235,.35)}
.plan .flag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--blue);color:#fff;font-size:12px;padding:3px 14px;border-radius:20px;font-weight:600}
.plan h3{font-size:17px}
.plan .price{font-size:38px;font-weight:900;margin:12px 0 2px}
.plan .price small{font-size:14px;font-weight:400;color:var(--txt3)}
.plan .per{color:var(--txt3);font-size:13px;margin-bottom:16px}
.plan ul{list-style:none;margin:0 0 20px;text-align:left;font-size:13.5px;color:var(--txt2)}
.plan li{padding:4px 0;display:flex;gap:8px}
.plan li::before{content:"✓";color:var(--ok);font-weight:700}
.plan .old{color:var(--txt3);text-decoration:line-through;font-size:14px;margin-left:6px}

/* ===== 步骤 ===== */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px;counter-reset:step}
.step{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px 22px;position:relative}
.step .num{width:38px;height:38px;border-radius:50%;background:var(--blue);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:16px}
.step h3{font-size:15px;margin-bottom:6px}
.step p{color:var(--txt2);font-size:13.5px}

/* ===== FAQ ===== */
.faq{max-width:760px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:15px 18px;font-size:14.5px;font-weight:600;cursor:pointer;color:var(--txt);display:flex;justify-content:space-between;align-items:center}
.faq-q .arr{color:var(--txt3);transition:transform .2s}
.faq-item.open .arr{transform:rotate(180deg)}
.faq-a{display:none;padding:0 18px 15px;color:var(--txt2);font-size:14px}
.faq-item.open .faq-a{display:block}

/* ===== 页脚 ===== */
footer{background:#0f172a;color:#94a3b8;padding:36px 0;font-size:13px}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer a{color:#cbd5e1}
footer a:hover{color:#fff}

/* ===== 认证页（登录/注册） ===== */
.auth{max-width:420px;margin:60px auto;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:34px}
.auth h1{font-size:22px;text-align:center;margin-bottom:6px}
.auth .sub{text-align:center;color:var(--txt2);font-size:14px;margin-bottom:22px}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:5px;color:var(--txt2)}
.field input{width:100%;padding:10px 13px;border:1px solid #cbd5e1;border-radius:9px;font-size:14px}
.field input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.auth .foot{text-align:center;font-size:13px;color:var(--txt2);margin-top:16px}
.captcha-row{display:flex;gap:8px;align-items:stretch}
.captcha-row input{flex:1;min-width:0}
.captcha-img{height:42px;width:112px;border:1px solid #cbd5e1;border-radius:9px;cursor:pointer;user-select:none;background:var(--card)}
.captcha-img:hover{border-color:var(--blue)}
.alert{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;border-radius:9px;padding:10px 14px;font-size:13.5px;margin-bottom:14px}
.alert-ok{background:#f0fdf4;border:1px solid #bbf7d0;color:#15803d}

/* ===== 用户中心 ===== */
.uc{max-width:860px;margin:40px auto;padding:0 20px}
.uc-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;flex-wrap:wrap;gap:12px}
.uc-top h1{font-size:24px}
.uc-top .user-info{color:var(--txt2);font-size:14px}
.card{border:1px solid var(--line);background:var(--card);border-radius:14px}
.lic-card{padding:22px;margin-bottom:16px;border-left:5px solid var(--blue)}
.lic-card.expired{border-left-color:var(--danger)}
.lic-card.soon{border-left-color:var(--warn)}
.lic-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:10px}
.lic-code{font-family:Consolas,Monaco,monospace;font-size:17px;font-weight:700;letter-spacing:1px}
.badge{display:inline-block;border-radius:20px;padding:3px 12px;font-size:12px;font-weight:600}
.badge-ok{background:#f0fdf4;color:var(--ok)}
.badge-warn{background:#fffbeb;color:var(--warn)}
.badge-danger{background:#fef2f2;color:var(--danger)}
.badge-gray{background:#f1f5f9;color:var(--txt2)}
.lic-meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;font-size:13.5px;color:var(--txt2);margin-bottom:14px}
.lic-meta b{display:block;color:var(--txt);font-size:15px;margin-top:2px}
.lic-actions{display:flex;gap:10px;flex-wrap:wrap}
.countdown{background:var(--blue-l);border:1px solid #bfdbfe;color:var(--blue-d);border-radius:10px;padding:8px 16px;font-size:14px;margin-bottom:16px;font-weight:600}
.countdown.danger{background:#fef2f2;border-color:#fecaca;color:#b91c1c}
.empty{text-align:center;padding:48px 20px;color:var(--txt3)}
.empty .big{font-size:40px;margin-bottom:10px}
.redeem-box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px;max-width:560px;margin:0 auto 30px}
.redeem-box h2{font-size:18px;margin-bottom:6px;text-align:center}
.redeem-box .sub{text-align:center;color:var(--txt2);font-size:13.5px;margin-bottom:16px}
.code-input{width:100%;padding:12px 14px;border:1px solid #cbd5e1;border-radius:10px;font-size:16px;font-family:Consolas,Monaco,monospace;letter-spacing:1px;text-transform:uppercase;text-align:center}
.code-input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.lic-notice{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:12px 16px;font-size:13.5px;color:#92400e;margin-bottom:20px}

/* ===== 响应式 ===== */
@media (max-width:720px){
  .hero{padding:56px 16px 48px}
  .hero h1{font-size:30px}
  .nav-links{display:none}
  .nav .nav-cta{display:block}
  section{padding:46px 0}
  .plan{margin-bottom:8px}
}