/* ============ 诡道商学·课程手机站 前台样式（方案一·明亮书城风，移动优先） ============ */
:root{
    --bg:#f5f1ea;
    --surface:#ffffff;
    --surface-2:#faf7f1;
    --ink:#2c2a26;
    --ink-2:#6f6a60;
    --ink-3:#9b958a;
    --brand:#e4553a;
    --brand-deep:#c93f27;
    --free:#1f9d61;
    --free-bg:#e5f6ec;
    --pay:#e4553a;
    --pay-bg:#fdeeea;
    --line:#ece7dd;
    --radius:14px;
    --radius-s:10px;
    --shadow:0 2px 10px rgba(80,60,30,.07);
    --maxw:520px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
    background:var(--bg);color:var(--ink);line-height:1.55;font-size:15px;
}
a{color:var(--brand);text-decoration:none}
img{max-width:100%;vertical-align:middle}
.page{max-width:var(--maxw);margin:0 auto;background:var(--bg);min-height:100vh;display:flex;flex-direction:column}
.main{flex:1;padding-bottom:8px}

/* ===== 顶部导航 ===== */
.topbar{
    position:sticky;top:0;z-index:50;
    background:rgba(255,255,255,.96);backdrop-filter:blur(8px);
    border-bottom:1px solid var(--line);padding:10px 14px;
    display:flex;align-items:center;gap:10px;
}
.brand{display:flex;align-items:center;gap:7px;font-weight:800;font-size:19px;color:var(--brand);letter-spacing:.5px;text-decoration:none}
.brand .mark{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--brand),#f38b5c);display:grid;place-items:center;color:#fff;font-size:14px}
.member-actions{display:flex;align-items:center;gap:6px;flex:none;margin-left:auto}
.btn-login{border:none;background:none;color:var(--brand);font-size:14px;font-weight:600;padding:7px 4px;cursor:pointer}
.btn-reg{border:none;background:var(--brand);color:#fff;font-size:13px;font-weight:600;padding:7px 13px;border-radius:999px;cursor:pointer;transition:background .15s}
.btn-reg:active{background:var(--brand-deep)}
.vip-tag{display:inline-block;padding:2px 8px;border-radius:10px;background:linear-gradient(90deg,#f6b73c,#f9d976);color:#5b3a00;font-size:12px;font-weight:700;margin-right:4px}
.vip-tag.gray{background:#eee;color:#888}

/* ===== 主导航 ===== */
.nav{
    display:flex;background:#fff;border-bottom:1px solid var(--line);
    position:sticky;top:52px;z-index:40;
}
.nav a{
    flex:1;text-align:center;padding:10px 4px;font-size:14px;color:var(--ink-2);text-decoration:none;
    border-bottom:2px solid transparent;transition:color .15s,border-color .15s;
}
.nav a.on{color:var(--brand);font-weight:700;border-color:var(--brand)}

/* ===== 提示条 ===== */
.flash{margin:10px 12px 0;padding:10px 14px;border-radius:var(--radius-s);background:var(--free-bg);color:var(--free);font-size:13.5px}
.flash.err{background:var(--pay-bg);color:var(--pay)}

/* ===== 区块通用 ===== */
.block{background:var(--surface);margin:12px;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.block-head{display:flex;align-items:baseline;justify-content:space-between;padding:15px 16px 4px}
.block-title{font-size:clamp(17px,4.6vw,21px);font-weight:800;display:flex;align-items:center;gap:8px;line-height:1.35}
.block-title::before{content:"";width:4px;height:16px;border-radius:3px;background:var(--brand)}
.block-body{padding:12px 16px 16px}

/* ===== 课程卡（含幻灯片轮播） ===== */
.course-card{padding:14px 16px}
.slider{position:relative;margin:-14px -16px 0;overflow:hidden;background:var(--surface-2)}
.slides{display:flex;transition:transform .45s ease}
.slide{flex:none;width:100%}
.slide img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}
.dots{position:absolute;left:0;right:0;bottom:9px;display:flex;justify-content:center;gap:6px;z-index:2}
.dots span{width:6px;height:6px;border-radius:99px;background:rgba(255,255,255,.6);cursor:pointer;transition:width .2s,background .2s}
.dots span.on{width:17px;background:#fff}
.slide-badge{
    position:absolute;top:10px;left:10px;z-index:2;display:inline-flex;align-items:center;gap:4px;
    background:rgba(44,42,38,.62);color:#fff;font-size:11px;font-weight:600;
    padding:3px 9px;border-radius:999px;backdrop-filter:blur(4px);
}
.course-head{margin-top:14px}
.course-name{font-size:18px;font-weight:800;line-height:1.3}
.course-meta{margin-top:3px;font-size:12.5px;color:var(--ink-2)}
.course-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.chip{font-size:11px;padding:2px 8px;border-radius:999px;background:var(--surface-2);color:var(--ink-2);border:1px solid var(--line)}
.chip.chip-hot{background:var(--pay-bg);color:var(--brand);border-color:#f8d7cf}
.course-stats{display:flex;gap:14px;margin-top:10px}
.course-stats .stat{text-align:center}
.course-stats .stat b{display:block;font-size:17px}
.course-stats .stat span{font-size:11.5px;color:var(--ink-3)}
.course-cta{margin-top:12px}
.course-cta .btn{width:100%}

/* ===== 课程介绍（长文） ===== */
.book-intro{margin:14px -16px -14px;padding:15px 16px;background:#ffffff;border-top:1px solid var(--line)}
.intro-title{font-size:14px;font-weight:800;color:var(--ink);display:flex;align-items:center;gap:6px}
.intro-title::before{content:"";width:3px;height:14px;border-radius:2px;background:var(--brand)}
.book-intro p{margin-top:9px;font-size:14px;line-height:1.9;color:var(--ink);text-align:justify}
.book-intro p:first-of-type{margin-top:10px}

/* ===== 课时列表（免费试看 + 付费） ===== */
.chap-block{margin:14px -16px -14px}
.chap-bar{
    display:flex;align-items:center;justify-content:space-between;padding:9px 16px;
    background:var(--free-bg);font-size:13px;font-weight:700;color:var(--free);
}
.chap-bar b{font-weight:500;color:#3e9a68;font-size:12px}
.chap-list{list-style:none;background:var(--surface)}
.chap-item{display:flex;align-items:center;gap:10px;padding:11px 16px;border-top:1px solid var(--line)}
.chap-item:first-child{border-top:none}
.chap-lock{flex:none;font-size:13px}
.chap-lock.ok{color:var(--free)}
.chap-name{flex:1;min-width:0;font-size:14px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chap-meta{flex:none}
.badge{flex:none;font-size:11px;font-weight:700;padding:2px 8px;border-radius:6px;display:inline-block}
.badge.free{background:var(--free-bg);color:var(--free)}
.badge.pay{background:var(--pay-bg);color:var(--pay)}
.expand-btn{
    display:block;width:calc(100% - 32px);margin:2px 16px 14px;padding:9px;border-radius:var(--radius-s);
    border:1px solid var(--line);background:var(--surface);color:var(--ink-2);font-size:13px;cursor:pointer;
}
.chap-item.more{display:none}
.chap-item.more.show{display:flex}
.expand-btn:active{background:var(--surface-2)}

/* ===== 会员面板 ===== */
#member{scroll-margin-top:110px}
.member-hero{background:linear-gradient(135deg,#fff 0%,#fdeeea 100%);padding:18px 16px 12px}
.member-title{font-size:17px;font-weight:800;margin-bottom:6px}
.member-sub{font-size:12.5px;color:var(--ink-2);margin-bottom:14px}
.member-actions-row{display:flex;gap:10px}
.mbtn{flex:1;text-align:center;padding:11px;border-radius:var(--radius-s);font-size:14px;font-weight:700;text-decoration:none;display:block}
.mbtn.primary{background:var(--brand);color:#fff}
.mbtn.ghost{border:1px solid var(--brand);color:var(--brand);background:#fff}
.member-form{padding:4px 16px 16px}
.member-tip{margin-top:12px;font-size:11.5px;color:var(--ink-3)}

/* ===== 表单（登录/注册/会员区） ===== */
.form-tip{margin:8px 0;font-size:12.5px;color:var(--ink-3)}
.field-label{display:block;font-size:13.5px;font-weight:600;margin:12px 0 5px;color:var(--ink)}
.field{margin-bottom:12px}
.field input,.member-form input{
    width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:var(--radius-s);
    font-size:15px;background:#fff;color:var(--ink);
}
.field input:focus,.member-form input:focus{outline:none;border-color:var(--brand)}
.btn-submit{
    display:block;width:100%;margin-top:16px;padding:12px;border:0;border-radius:var(--radius-s);
    background:var(--brand);color:#fff;font-size:15px;font-weight:700;cursor:pointer;
}
.btn-submit:active{background:var(--brand-deep)}
.auth-foot{text-align:center;margin-top:14px;color:var(--ink-2);font-size:13.5px}
.auth-card{
    max-width:420px;margin:28px auto;padding:26px 20px;border-radius:var(--radius);
    background:var(--surface);box-shadow:var(--shadow);
}
.auth-card h2{text-align:center;margin-bottom:16px;font-size:20px}
.auth-card .tip{color:var(--ink-3)}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border:0;border-radius:var(--radius-s);font-size:15px;cursor:pointer;text-align:center}
.btn-vip{background:linear-gradient(135deg,var(--brand),#f38b5c);color:#fff;font-weight:700}
.btn-points{background:linear-gradient(135deg,var(--brand),var(--brand-deep));color:#fff;font-weight:700}
.btn-ghost{background:#fff;color:var(--ink-2);border:1px solid var(--line)}
.btn-block{width:100%}

/* ===== 付费锁卡片 ===== */
.lock-wrap{margin:16px 0;background:linear-gradient(180deg,#fdf6f2,#fdeeea);border:1px solid #f8d7cf;border-radius:var(--radius);overflow:hidden;text-align:center}
.lock-card{padding:22px 16px}
.lock-card h4{font-size:17px}
.lock-desc{color:var(--ink-2);font-size:13px;margin-top:6px}
.gate-btns{display:flex;gap:10px;justify-content:center;margin-top:14px;flex-wrap:wrap}
.lock-tip{display:block;width:100%;color:var(--pay);font-size:12px}

/* ===== 阅读页 ===== */
.reader{padding:6px 0 0}
.reader-meta{display:flex;align-items:center;gap:10px;padding:14px 16px 0;color:var(--ink-2);font-size:13px;flex-wrap:wrap}
.reader-content{padding:12px 16px 20px}
.reader-content p{margin-bottom:12px;font-size:15.5px;line-height:1.9}
.reader-content img{border-radius:8px}
.reader-content h2,.reader-content h3{margin:14px 0 8px}
.reader-nav{display:flex;justify-content:space-between;gap:10px;padding:0 16px 18px}
.nav-btn{padding:10px 14px;border:1px solid var(--line);border-radius:var(--radius-s);background:#fff;color:var(--ink-2);font-size:13.5px}
.video-box{background:#000;border-radius:var(--radius);overflow:hidden;margin:0 16px 8px}
.video-box video{width:100%;display:block}
.video-lock{position:relative}
.video-lock-mask{
    position:absolute;inset:0;z-index:2;background:rgba(20,18,15,.72);color:#fff;
    display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;font-size:14px;
}
.video-lock-mask p{font-weight:700}
.video-lock-mask span{font-size:12px;color:#cfc9c0}
.video-tip{padding:8px 14px;background:var(--free-bg);color:var(--free);font-size:12.5px}

/* ===== 充值 / 会员套餐 ===== */
.sec{padding:0 0 6px}
.sec-title{font-size:19px;margin:16px 14px 12px;font-weight:800;position:relative;padding-left:10px}
.sec-title::before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:4px;border-radius:2px;background:var(--brand)}
.card-plain{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;margin:0 12px 14px}
.card-plain h3{font-size:15px;margin-bottom:10px}
.amount-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:10px}
.amount-btn{padding:12px 4px;border:1px solid var(--line);border-radius:var(--radius-s);background:#fff;color:var(--ink);font-size:15px;cursor:pointer}
.amount-btn small{display:block;color:var(--ink-3);font-size:11px;font-weight:400}
.amount-btn.on{border-color:var(--brand);background:var(--pay-bg);color:var(--brand);font-weight:700}
.amount-btn.custom{color:var(--ink-2);font-size:13px}
.channel-row{display:flex;gap:10px;margin:12px 0}
.channel{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;padding:11px;border:1px solid var(--line);border-radius:var(--radius-s);color:var(--ink-2);cursor:pointer;font-size:13.5px}
.channel.on{border-color:var(--brand);background:var(--pay-bg);color:var(--brand);font-weight:700}
.channel input[type="radio"]{appearance:none;-webkit-appearance:none;width:18px;height:18px;border:2px solid var(--ink-3);border-radius:50%;cursor:pointer;flex-shrink:0;position:relative}
.channel input[type="radio"]:checked{border-color:var(--brand);background:var(--brand)}
.channel input[type="radio"]:checked::after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:6px;height:6px;border-radius:50%;background:#fff}
.ci{display:inline-flex;width:24px;height:24px;border-radius:50%;background:#07c160;color:#fff;align-items:center;justify-content:center;font-size:12px}
.channel input[value="alipay"]:checked ~ .ci,.channel:has(input[value="alipay"]) .ci{background:#1677ff}
.plan-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:0 12px}
.plan{border:1px solid var(--line);border-radius:var(--radius);padding:16px;background:#fff;text-align:center}
.plan h3{font-size:17px}
.plan-price{margin:10px 0}
.plan-price strong{font-size:26px;color:var(--brand)}
.plan-price small{color:var(--ink-3)}
.plan-modes{display:flex;gap:8px;margin-top:10px}
.mode-btn{flex:1;padding:8px 2px;border:1px solid var(--line);border-radius:var(--radius-s);background:#fff;font-size:12px;cursor:pointer;color:var(--ink-2)}
.mode-btn b{display:block;color:var(--brand);font-size:14px}
.mode-btn.on{border-color:var(--brand);background:var(--pay-bg);color:var(--brand)}

/* ===== 支付弹窗 ===== */
.modal-mask{position:fixed;inset:0;background:rgba(44,42,38,.55);z-index:100;display:flex;align-items:center;justify-content:center;padding:20px}
.modal{background:#fff;border-radius:14px;padding:24px 20px;width:330px;max-width:100%;text-align:center;position:relative}
.modal h3{margin-bottom:14px}
.modal-close{position:absolute;right:10px;top:6px;font-size:24px;color:var(--ink-3);background:none;border:0;cursor:pointer}
.pay-qr{display:flex;justify-content:center}
.pay-qr img{max-width:220px}
.pay-tip{color:var(--ink-2);font-size:13px;margin-top:10px}
.bank-box{text-align:left;margin-top:4px}
.bank-box h4{font-size:15px;margin-bottom:10px;text-align:center}
.bank-table{width:100%;border-collapse:collapse;font-size:13.5px}
.bank-table th,.bank-table td{padding:8px 10px;border:1px solid var(--line);text-align:left}
.bank-table th{background:var(--surface-2);color:var(--ink-2);font-weight:600;width:88px}
.bank-note{margin-top:10px;font-size:12.5px;color:var(--ink-2)}
.bank-box input[type=text]{width:100%;padding:10px;border:1px solid var(--line);border-radius:var(--radius-s);font-size:14px;margin-top:10px}
.bank-box .btn{margin-top:10px}

/* ===== 列表页 ===== */
.page-title{padding:16px 14px 6px}
.page-title h2{font-size:20px}
.cat-nav{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.cat-nav a{padding:5px 12px;border-radius:14px;background:#fff;border:1px solid var(--line);color:var(--ink-2);font-size:13px}
.cat-nav a.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;padding:12px}
.card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;color:var(--ink)}
.card-cover{position:relative;height:110px;background:#eee center/cover no-repeat}
.card-badge{position:absolute;left:8px;top:8px;background:rgba(0,0,0,.55);color:#fff;font-size:11px;padding:2px 8px;border-radius:8px}
.card-body{padding:10px}
.card-body h3{font-size:15px;line-height:1.4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.card-body p{font-size:12px;color:var(--ink-3);margin-top:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.card-meta{display:flex;align-items:center;gap:8px;margin-top:8px;font-size:12px;color:var(--ink-3)}
.card-meta .tag{margin-left:auto}
.tag{display:inline-block;padding:2px 8px;border-radius:8px;font-size:11px;font-weight:700}
.tag-vip{background:var(--pay-bg);color:var(--brand)}
.more-link{display:block;text-align:center;margin:14px 0;color:var(--brand);font-size:14px}
.pager{display:flex;justify-content:center;align-items:center;gap:8px;margin:16px 0 20px}
.pg{padding:6px 12px;border-radius:6px;background:#fff;border:1px solid var(--line);color:var(--ink-2);font-size:13px}
.pg.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.pg.off{color:#ccc;background:#f7f7f7}
.pg-dot{color:#aaa}

/* ===== 个人中心 ===== */
.user-head{display:flex;align-items:center;gap:12px;padding:20px 16px;background:linear-gradient(135deg,var(--brand),#f38b5c);color:#fff}
.avatar{width:52px;height:52px;border-radius:50%;background:rgba(255,255,255,.25);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800}
.user-info{flex:1}
.user-info h2{font-size:17px}
.user-info p{margin-top:4px;font-size:12.5px;opacity:.9}
.user-stats{display:flex;gap:14px;margin-top:8px}
.user-stats .stat b{display:block;font-size:17px}
.user-stats .stat span{font-size:12px;opacity:.85}
.tabs{display:flex;background:#fff;border-bottom:1px solid var(--line);overflow-x:auto}
.tabs a{flex:1;min-width:84px;text-align:center;padding:12px 6px;color:var(--ink-2);font-size:14px;border-bottom:2px solid transparent;white-space:nowrap}
.tabs a.on{color:var(--brand);border-bottom-color:var(--brand);font-weight:700}
.user-body{padding:12px}
.quick-row{display:flex;gap:10px;flex-wrap:wrap}
.quick{padding:9px 16px;border-radius:8px;background:var(--surface-2);color:var(--brand);font-weight:600;font-size:14px;border:1px solid var(--line)}
table.kv{width:100%;border-collapse:collapse;font-size:14px}
table.kv td{padding:7px 4px;border-bottom:1px dashed var(--line)}
table.kv td:first-child{color:var(--ink-3);width:100px}
table.list{width:100%;border-collapse:collapse;font-size:13px}
table.list th,table.list td{padding:8px 6px;border-bottom:1px solid var(--line);text-align:left}
table.list th{background:var(--surface-2);color:var(--ink-2)}
.buy-item{padding:9px 0;border-bottom:1px dashed var(--line);font-size:14px}
.buy-item small{color:var(--ink-3)}
.invite-box{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.invite-info{flex:1;min-width:220px;font-size:14px}
.invite-info p{margin-bottom:6px}
.url-input{width:100%;padding:8px;border:1px dashed #ccc;border-radius:6px;font-size:12px;color:var(--ink-2);margin-bottom:6px}
.h-form{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.h-form input{flex:1;min-width:130px;padding:10px;border:1px solid var(--line);border-radius:var(--radius-s);font-size:14px}
.h-form input:focus{outline:none;border-color:var(--brand)}

/* ===== 通用文本 ===== */
.mono{font-family:Menlo,Consolas,monospace;font-size:12px}
.ok{color:var(--free)}
.wait{color:var(--brand)}
.err{color:#c62828}
.muted{color:#ccc}
.empty{color:var(--ink-3);text-align:center;padding:28px 0;font-size:13.5px}
.tip{color:var(--ink-3);font-size:12.5px;margin-top:8px;line-height:1.7}

/* ===== 页脚 ===== */
.footer{margin-top:auto;padding:22px 16px 34px;text-align:center;font-size:12px;color:var(--ink-3);line-height:1.8}
.footer b{color:var(--ink-2)}

/* ===== 联系站长卡片 ===== */
.contact-card{margin:0 auto 16px;padding:14px 16px;max-width:360px;background:var(--card,#fff);border:1px solid var(--line,#e5e5e5);border-radius:var(--radius-s,10px);text-align:left}
.contact-title{font-size:14px;font-weight:600;color:var(--ink-1,#1d1d1f);margin-bottom:8px}
.contact-line{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-2,#555);margin:6px 0;flex-wrap:wrap;justify-content:center}
.btn-copy{flex:none;padding:4px 12px;font-size:12px;color:#fff;background:var(--brand,#16a34a);border:none;border-radius:999px;cursor:pointer}
.btn-copy:active{opacity:.8}
.qr-wrap{display:inline-block}
.contact-qr{display:block;width:110px;height:110px;object-fit:contain;border:1px solid var(--line,#e5e5e5);border-radius:8px;background:#fff}

@media (prefers-reduced-motion:reduce){
    *{transition:none!important;animation:none!important}
}