/* ===== CSS Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:64px;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#1a1a2e;line-height:1.7;background:#fff;-webkit-font-smoothing:antialiased}

/* ===== TikTok 色彩变量 ===== */
:root{
    --tk-black:#010101;
    --tk-dark:#121212;
    --tk-pink:#FE2C55;
    --tk-cyan:#20D5EC;
    --tk-blue:#0057FF;
    --tk-blue-light:#E8F0FE;
    --tk-blue-dark:#0041CC;
    --tk-gray:#F5F5F7;
    --tk-gray-dark:#666;
    --tk-border:#E5E5E5;
    --tk-white:#FFF;
    --shadow-sm:0 2px 8px rgba(0,0,0,.08);
    --shadow-md:0 4px 20px rgba(0,0,0,.12);
    --radius:12px;
}

.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:80px 0}
.section-alt{background:var(--tk-gray)}

/* ===== Header / 固定导航 ===== */
.header{
    position:fixed;top:0;left:0;right:0;z-index:1000;
    background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
    border-bottom:1px solid var(--tk-border);
    transition:box-shadow .3s;
}
.header.scrolled{box-shadow:var(--shadow-sm)}
.nav-container{
    max-width:1200px;margin:0 auto;padding:0 20px;
    display:flex;align-items:center;justify-content:space-between;
    height:64px
}
.nav-logo{
    font-size:1.25rem;font-weight:700;color:var(--tk-black);
    text-decoration:none;display:flex;align-items:center;gap:8px
}
.nav-logo h1{font-size: 1.25rem;}
.nav-logo::before{
    content:"";display:inline-block;
    width:28px;height:28px;
    background:url(../images/logo.png) no-repeat center;
    background-size: 100%;
    border-radius:6px
}
.nav-menu{display:flex;gap:4px;align-items:center}
.nav-link{
    padding:8px 16px;font-size:.925rem;font-weight:500;
    color:var(--tk-dark);text-decoration:none;
    border-radius:20px;transition:all .25s
}
.nav-link:hover,.nav-link.active{
    color:var(--tk-blue);background:var(--tk-blue-light)
}

/* 汉堡菜单 */
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px;z-index:1001}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--tk-dark);border-radius:2px;transition:all .3s}
.nav-toggle.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* ===== Banner ===== */
.banner{
    position:relative;min-height:70vh;
    display:flex;align-items:center;justify-content:center;
    text-align:center;padding:120px 20px 80px;overflow:hidden;
    background:#fff
}
.banner-bg{
    position:absolute;inset:0;
    background:linear-gradient(135deg,var(--tk-cyan),#69C9FF,var(--tk-pink));
    opacity:.06
}
.banner::after{
    content:"";position:absolute;bottom:0;left:0;right:0;
    height:120px;
    background:linear-gradient(180deg,transparent,var(--tk-gray));
    pointer-events:none
}
.banner-content{position:relative;z-index:2;max-width:1000px}
.banner .title{
    font-size:2.8rem;font-weight:800;line-height:1.3;
    background:linear-gradient(135deg,var(--tk-black),var(--tk-blue-dark));
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
    background-clip:text;margin-bottom:16px
}
.banner .title span{
    cursor: pointer;
}
.banner-subtitle{
    font-size:1.15rem;color:var(--tk-gray-dark);margin-bottom:36px
}
.banner-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ===== Buttons ===== */
.btn{display:inline-block;padding:14px 32px;font-size:1rem;font-weight:600;border-radius:50px;text-decoration:none;transition:all .3s;cursor:pointer;border:none}
.btn-primary{
    background:var(--tk-pink);color:#fff;
    box-shadow:0 4px 16px rgba(254,44,85,.35)
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(254,44,85,.45)}
.btn-outline{
    background:var(--tk-white);color:var(--tk-blue);
    border:2px solid var(--tk-blue)
}
.btn-outline:hover{background:var(--tk-blue);color:#fff}
.btn-official{
    background:var(--tk-pink);color:#fff;font-size:1.15rem;
    padding:16px 40px;box-shadow:0 4px 20px rgba(254,44,85,.35)
}
.btn-official:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(254,44,85,.5)}

/* ===== Section Headings ===== */
.section h2{
    font-size:2rem;font-weight:700;text-align:center;
    margin-bottom:48px;position:relative;padding-bottom:20px
}
.section h2::after{
    content:"";position:absolute;bottom:0;left:50%;transform:translateX(-50%);
    width:60px;height:4px;
    background:linear-gradient(90deg,var(--tk-cyan),var(--tk-pink));
    border-radius:2px
}

/* ===== Intro Section ===== */
.intro-grid{display:flex;gap:56px;align-items:center}
.intro-text{flex:1}
.intro-brand{
    font-size:1.35rem;color:var(--tk-dark);font-weight:700;
    background:var(--tk-dark);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
    background-clip:text;margin-right:2px
}
.intro-text>p{
    font-size:1.1rem;color:#333;margin-bottom:36px;line-height:1.9;
    padding:20px 24px;background:linear-gradient(135deg,rgba(0,87,255,.04),rgba(254,44,85,.04));
    border-radius:var(--radius);border-left:4px solid var(--tk-blue)
}
.intro-image{flex-shrink:0;position:relative}
.intro-image::before{
    content:"";position:absolute;inset:-12px;
    background:linear-gradient(135deg,var(--tk-cyan),var(--tk-pink));
    border-radius:36px;opacity:.15;filter:blur(20px);z-index:0
}
.intro-image img{
    position:relative;z-index:1;
    width:280px;height:280px;border-radius:24px;
    box-shadow:0 8px 32px rgba(0,0,0,.1);
    transition:transform .4s
}
.intro-image img:hover{transform:scale(1.03)}
.feature-list{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.feature-item{
    display:flex;align-items:flex-start;gap:16px;
    padding:20px 18px;background:var(--tk-white);
    border-radius:var(--radius);border:1px solid var(--tk-border);
    position:relative;overflow:hidden;
    transition:transform .3s,box-shadow .3s,border-color .3s
}
.feature-item::before{
    content:"";position:absolute;top:0;left:0;
    width:4px;height:100%;
    border-radius:4px 0 0 4px
}
.feature-item:nth-child(1)::before{background:linear-gradient(180deg,var(--tk-cyan),#00B3D6)}
.feature-item:nth-child(2)::before{background:linear-gradient(180deg,#FE2C55,var(--tk-pink))}
.feature-item:nth-child(3)::before{background:linear-gradient(180deg,#FFB800,#FF9500)}
.feature-item:nth-child(4)::before{background:linear-gradient(180deg,#00C853,#00E676)}
.feature-item:hover{
    transform:translateY(-3px);box-shadow:0 8px 28px rgba(0,0,0,.1);
    border-color:transparent
}
.feature-item h3{
    font-size:1.05rem;margin-bottom:6px;color:var(--tk-dark);
    display:flex;align-items:center;gap:8px
}
.feature-item h3::before{
    content:"";display:inline-block;width:8px;height:8px;
    border-radius:50%;flex-shrink:0
}
.feature-item:nth-child(1) h3::before{background:var(--tk-cyan)}
.feature-item:nth-child(2) h3::before{background:var(--tk-pink)}
.feature-item:nth-child(3) h3::before{background:#FFB800}
.feature-item:nth-child(4) h3::before{background:#00C853}
.feature-item p{font-size:.9rem;color:#666;line-height:1.6}
.feature-icon{font-size:2rem;flex-shrink:0;width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--tk-gray);border-radius:12px}

/* ===== Intro Extra (TikTok来源 + 海外专线) ===== */
.intro-extra{margin-top:56px;display:grid;grid-template-columns:1fr 1fr;gap:28px}
.intro-extra-item{
    background:var(--tk-white);padding:32px 28px;
    border-radius:var(--radius);box-shadow:0 2px 12px rgba(0,0,0,.06);
    border:1px solid var(--tk-border);
    position:relative;overflow:hidden;
    transition:transform .3s,box-shadow .3s
}
.intro-extra-item::before{
    content:"";position:absolute;top:0;left:0;right:0;
    height:4px;border-radius:var(--radius) var(--radius) 0 0
}
.intro-extra-item:first-child::before{
    background:linear-gradient(90deg,#FE2C55,var(--tk-pink))
}
.intro-extra-item:last-child::before{
    background:linear-gradient(90deg,var(--tk-blue),var(--tk-cyan))
}
.intro-extra-item:hover{
    transform:translateY(-4px);
    box-shadow:0 12px 36px rgba(0,0,0,.1)
}
.intro-extra-item h3{
    font-size:1.2rem;color:var(--tk-dark);margin-bottom:16px;
    padding-bottom:14px;border-bottom:1px solid var(--tk-border);
    display:flex;align-items:center;gap:10px
}
.intro-extra-item:first-child h3::before{
    content:"🌏";font-size:1.3rem
}
.intro-extra-item:last-child h3::before{
    content:"🔗";font-size:1.3rem
}
.intro-extra-item p{font-size:.95rem;color:#555;line-height:1.85;margin-bottom:14px}
.intro-extra-item p:last-of-type{margin-bottom:8px}
.intro-extra-item ol{
    padding-left:22px;margin-bottom:0;
    list-style:none;counter-reset:step
}
.intro-extra-item ol li{
    font-size:.93rem;color:#555;margin-bottom:10px;line-height:1.6;
    counter-increment:step;position:relative;padding-left:6px
}
.intro-extra-item ol li::marker{
    content:"(" counter(step) ")  ";font-weight:700;color:var(--tk-blue)
}

/* ===== Official Section ===== */
.official-box{
    max-width:560px;margin:0 auto;text-align:center;
    padding:48px 32px;background:var(--tk-white);
    border-radius:var(--radius);box-shadow:var(--shadow-md)
}
.official-badge{
    display:inline-block;padding:6px 18px;margin-bottom:20px;
    background:linear-gradient(135deg,var(--tk-cyan),var(--tk-pink));
    color:#fff;font-size:.85rem;font-weight:600;border-radius:50px
}
.official-url{
    font-size:1.4rem;font-weight:700;color:var(--tk-dark);
    margin-bottom:24px;word-break:break-all
}
.official-tip{font-size:.9rem;color:#e74c3c;margin-top:20px}

/* ===== Download Section ===== */
.download-intro{
    max-width:800px;margin:0 auto 40px;text-align:center;
    font-size:1.05rem;color:#555;line-height:1.9
}

/* === 选项卡容器 === */
.download-tabs{
    max-width:1000px;margin:0 auto
}

/* === 选项卡导航 === */
.tab-nav{
    display:flex;gap:0;
    background:var(--tk-gray);border-radius:var(--radius) var(--radius) 0 0;
    padding:6px;overflow:hidden
}
.tab-btn{
    flex:1;display:flex;align-items:center;justify-content:center;gap:8px;
    padding:14px 12px;border:none;background:transparent;
    border-radius:calc(var(--radius) - 4px);
    font-size:.95rem;font-weight:600;color:#888;cursor:pointer;
    transition:all .3s cubic-bezier(.4,0,.2,1);
    position:relative;white-space:nowrap
}
.tab-btn:hover{color:#555;background:rgba(255,255,255,.5)}
.tab-btn.active{
    background:var(--tk-white);color:var(--tk-dark);
    box-shadow:0 2px 12px rgba(0,0,0,.08)
}
.tab-btn.active::after{
    content:"";position:absolute;bottom:-6px;left:50%;transform:translateX(-50%);
    width:24px;height:3px;border-radius:3px
}
.tab-btn[data-tab="prep"].active::after{background:linear-gradient(90deg,#FF9500,#FFB800)}
.tab-btn[data-tab="ios"].active::after{background:linear-gradient(90deg,var(--tk-blue),#007AFF)}
.tab-btn[data-tab="android"].active::after{background:linear-gradient(90deg,#3DDC84,#00C853)}
.tab-btn[data-tab="pc"].active::after{background:linear-gradient(90deg,#8B5CF6,#A78BFA)}
.tab-btn[data-tab="prep"].active{color:#E67E00}
.tab-btn[data-tab="ios"].active{color:var(--tk-blue)}
.tab-btn[data-tab="android"].active{color:#00A854}
.tab-btn[data-tab="pc"].active{color:#8B5CF6}
.tab-icon{font-size:1.1rem;transition:transform .3s}
.tab-btn.active .tab-icon{transform:scale(1.2)}

/* === 选项卡面板容器 === */
.tab-panels{
    background:var(--tk-white);border-radius:0 0 var(--radius) var(--radius);
    border:1px solid var(--tk-border);border-top:none;
    box-shadow:0 4px 20px rgba(0,0,0,.04)
}
.tab-panel{
    display:none;padding:32px 28px;
    animation:tabFadeIn .35s ease
}
.tab-panel.active{display:block}

@keyframes tabFadeIn{
    from{opacity:0;transform:translateY(8px)}
    to{opacity:1;transform:translateY(0)}
}

/* === 准备工作 === */
.prep-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.prep-card{
    background:var(--tk-gray);border-radius:var(--radius);
    overflow:hidden;transition:transform .3s,box-shadow .3s
}
.prep-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.prep-card-header{
    display:flex;align-items:center;gap:12px;
    padding:18px 20px;border-bottom:1px solid rgba(0,0,0,.06)
}
.prep-card-header img{width:40px;height:40px;flex-shrink:0}
.prep-card-header h4{font-size:1.1rem;color:var(--tk-dark)}
.prep-ios .prep-card-header{background:linear-gradient(135deg,rgba(0,122,255,.08),rgba(0,122,255,.02))}
.prep-android .prep-card-header{background:linear-gradient(135deg,rgba(61,220,132,.1),rgba(61,220,132,.02))}
.prep-item{display:flex;gap:14px;padding:16px 20px;border-bottom:1px solid rgba(0,0,0,.05)}
.prep-item:last-child{border-bottom:none}
.prep-num{
    flex-shrink:0;width:32px;height:32px;border-radius:50%;
    display:flex;align-items:center;justify-content:center;
    font-size:.85rem;font-weight:700;color:#fff;margin-top:2px
}
.prep-ios .prep-num{background:var(--tk-blue)}
.prep-android .prep-num{background:#3DDC84}
.prep-body strong{display:block;font-size:.98rem;color:var(--tk-dark);margin-bottom:4px}
.prep-body p{font-size:.9rem;color:#666;line-height:1.7;margin-bottom:6px}
.prep-body ul{padding-left:18px;margin-top:4px}
.prep-body ul li{font-size:.88rem;color:#666;margin-bottom:4px;line-height:1.6}

/* === 详细步骤 === */
.step-card{
    background:var(--tk-gray);border-radius:var(--radius);
    overflow:hidden;position:relative
}
.step-card-badge{
    display:inline-block;padding:6px 20px;font-size:.85rem;font-weight:700;color:#fff;
    border-radius:0 0 10px 0
}
.step-ios .step-card-badge{background:linear-gradient(135deg,var(--tk-blue),#007AFF)}
.step-android .step-card-badge{background:linear-gradient(135deg,#3DDC84,#00C853)}
.step-block{display:flex;gap:16px;padding:24px;border-bottom:1px solid rgba(0,0,0,.05)}
.step-block:last-child{border-bottom:none}
.step-block-num{
    flex-shrink:0;font-size:1.6rem;font-weight:800;
    line-height:1.2;min-width:44px
}
.step-ios .step-block-num{color:rgba(0,87,255,.2)}
.step-android .step-block-num{color:rgba(61,220,132,.3)}
.step-block-content h4{font-size:1.05rem;color:var(--tk-dark);margin-bottom:10px}
.step-block-content p,.step-block-content ol,.step-block-content ul{
    font-size:.93rem;color:#555;line-height:1.75;margin-bottom:8px
}
.step-block-content ol,.step-block-content ul{padding-left:20px}
.step-block-content ol li,.step-block-content ul li{margin-bottom:5px}
.step-block-content a{color:var(--tk-blue);text-decoration:underline}
.step-warn{font-size:.88rem!important;color:#c0392b!important;background:#FFF5F5;padding:10px 14px;border-radius:8px;margin-top:10px}
.step-tip{font-size:.88rem!important;color:var(--tk-blue)!important;background:var(--tk-blue-light);padding:10px 14px;border-radius:8px;margin-top:10px}

/* === PC 提示条 === */
.download-pc-note{
    display:flex;gap:16px;align-items:flex-start;
    background:linear-gradient(135deg,rgba(139,92,246,.06),rgba(167,139,250,.04));
    padding:28px 28px;border-radius:var(--radius);border:1px solid rgba(139,92,246,.15)
}
.pc-note-icon{font-size:2.2rem;flex-shrink:0;line-height:1}
.download-pc-note h4{font-size:1.05rem;color:var(--tk-dark);margin-bottom:6px}
.download-pc-note p{font-size:.93rem;color:#555;line-height:1.7}
.download-pc-note a{color:var(--tk-blue);text-decoration:underline}

/* ===== Register Section ===== */
.register-intro{
    max-width:780px;margin:0 auto 44px;text-align:center;
    font-size:1.05rem;color:#555;line-height:1.9
}
/* 三种注册方式卡片 */
.reg-methods{
    display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
    max-width:1100px;margin:0 auto 36px
}
.reg-card{
    background:var(--tk-white);border-radius:var(--radius);
    box-shadow:var(--shadow-sm);border:1px solid var(--tk-border);
    overflow:hidden;transition:transform .3s,box-shadow .3s;
    display:flex;flex-direction:column
}
.reg-card:hover{transform:translateY(-4px);box-shadow:0 12px 36px rgba(0,0,0,.1)}
.reg-card-header{
    display:flex;align-items:center;gap:12px;
    padding:20px 24px;border-bottom:1px solid var(--tk-border)
}
.reg-card:nth-child(1) .reg-card-header{background:linear-gradient(135deg,rgba(0,87,255,.06),rgba(0,87,255,.01))}
.reg-card:nth-child(2) .reg-card-header{background:linear-gradient(135deg,rgba(254,44,85,.06),rgba(254,44,85,.01))}
.reg-card:nth-child(3) .reg-card-header{background:linear-gradient(135deg,rgba(32,213,236,.06),rgba(32,213,236,.01))}
.reg-card-icon{font-size:1.6rem}
.reg-card-header h3{font-size:1.1rem;color:var(--tk-dark)}
.reg-card-body{padding:20px 24px;flex:1}
.reg-sub-block{margin-bottom:18px}
.reg-sub-block:last-child{margin-bottom:0}
.reg-sub-block h4{
    font-size:.95rem;color:var(--tk-dark);margin-bottom:8px;
    padding-bottom:6px;border-bottom:1px dashed var(--tk-border)
}
.reg-sub-block p{font-size:.9rem;color:#555;line-height:1.75}
.reg-sub-block ol{padding-left:20px}
.reg-sub-block ol li{font-size:.9rem;color:#555;margin-bottom:6px;line-height:1.7}
.reg-sub-block code{background:var(--tk-gray);padding:2px 6px;border-radius:4px;font-size:.85rem}
.reg-sub-block strong{color:var(--tk-dark)}

.register-note{
    max-width:780px;margin:0 auto 48px;padding:18px 24px;
    background:#FFF3CD;border:1px solid #FFC107;border-radius:var(--radius);
    font-size:.95rem;color:#856404;text-align:center;line-height:1.7
}

/* 常见问题折叠面板 */
.reg-troubleshoot{
    max-width:780px;margin:0 auto
}
.reg-ts-title{
    font-size:1.25rem;color:var(--tk-dark);text-align:center;margin-bottom:24px
}
.ts-item{
    background:var(--tk-white);border-radius:var(--radius);
    border:1px solid var(--tk-border);margin-bottom:12px;
    overflow:hidden;transition:box-shadow .3s
}
.ts-item:hover{box-shadow:var(--shadow-sm)}
.ts-question{
    width:100%;display:flex;align-items:center;gap:12px;
    padding:18px 24px;border:none;background:transparent;
    font-size:1rem;font-weight:600;color:var(--tk-dark);
    cursor:pointer;text-align:left;transition:color .25s
}
.ts-question:hover{color:var(--tk-blue)}
.ts-q-icon{font-size:1.2rem;flex-shrink:0}
.ts-arrow{
    margin-left:auto;font-size:1rem;color:#aaa;
    transition:transform .3s
}
.ts-question[aria-expanded="true"] .ts-arrow{transform:rotate(180deg)}
.ts-question[aria-expanded="true"]{color:var(--tk-blue)}
.ts-answer{
    max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;
    padding:0 24px
}
.ts-answer.open{max-height:400px;padding:0 24px 20px}
.ts-answer ul{padding-left:20px;margin:0}
.ts-answer ul li{
    font-size:.93rem;color:#555;line-height:1.75;margin-bottom:10px
}
.ts-answer ul li:last-child{margin-bottom:0}
.ts-answer strong{color:var(--tk-dark)}

/* ===== Use Section ===== */
.use-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.use-item{
    padding:28px 24px;background:var(--tk-white);
    border-radius:var(--radius);box-shadow:var(--shadow-sm);
    border:1px solid var(--tk-border);transition:all .3s
}
.use-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--tk-blue)}
.use-item h3{font-size:1.05rem;margin-bottom:10px;color:var(--tk-dark)}
.use-item p{font-size:.93rem;color:var(--tk-gray-dark);line-height:1.6}

/* ===== FAQ ===== */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--tk-border);overflow:hidden}
.faq-question{
    width:100%;display:flex;justify-content:space-between;align-items:center;
    padding:20px 0;background:none;border:none;cursor:pointer;
    font-size:1.05rem;font-weight:600;color:var(--tk-dark);text-align:left;
    transition:color .25s;gap:16px
}
.faq-question:hover{color:var(--tk-blue)}
.faq-icon{font-size:1.5rem;font-weight:300;transition:transform .3s;flex-shrink:0}
.faq-question[aria-expanded="true"] .faq-icon{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .5s ease}
.faq-answer.open{max-height:2000px}
.faq-answer-inner{padding:0 0 24px}
.faq-answer p,
.faq-answer li{
    font-size:.95rem;color:var(--tk-gray-dark);line-height:1.8
}
.faq-answer p{margin-bottom:12px}
.faq-answer a{color:var(--tk-blue);text-decoration:underline}
.faq-answer a:hover{color:var(--tk-blue-dark)}
.faq-steps,
.faq-list-ul{margin:4px 0 16px;padding-left:20px}
.faq-steps li,
.faq-list-ul li{margin-bottom:10px}
.faq-steps li:last-child,
.faq-list-ul li:last-child{margin-bottom:0}
.faq-notice{
    background:#FFF3CD;border-left:4px solid #FFC107;
    padding:14px 18px;border-radius:0 8px 8px 0;
    font-size:.93rem;color:#856404;line-height:1.7;margin-top:4px
}
.faq-notice strong{color:#664d03}

/* ===== Disclaimer ===== */
.disclaimer-section{padding:48px 0}
.disclaimer-section h3{text-align:center;font-size:1.3rem;color:#e74c3c;margin-bottom:24px}
.disclaimer-content{
    max-width:600px;margin:0 auto;
    padding:24px 28px;background:#FFF5F5;
    border:2px solid #e74c3c;border-radius:var(--radius)
}
.disclaimer-content p{font-size:.93rem;color:#c0392b;margin-bottom:8px;line-height:1.6}
.disclaimer-content p:last-child{margin-bottom:0}

/* ===== Footer ===== */
.footer{background:var(--tk-dark);color:#aaa;padding:48px 0 28px;text-align:center}
.footer-links{display:flex;justify-content:center;flex-wrap:wrap;gap:24px;margin-bottom:24px}
.footer-links a{color:#ccc;text-decoration:none;font-size:.9rem;transition:color .25s}
.footer-links a:hover{color:var(--tk-pink)}
.footer-copyright{font-size:.85rem;margin-bottom:8px}
.footer-copyright a{color:#aaa;padding:48px 0 28px;text-align:center; text-decoration: none;}
.footer-compliance{font-size:.8rem;color:#777}

/* ===== Responsive: Tablet 768px-1200px ===== */
@media(max-width:1200px){
    .intro-grid{flex-direction:column;align-items:center}
    .intro-image{order:-1}
}
@media(max-width:1024px){
    .prep-grid{grid-template-columns:1fr}
    .reg-methods{grid-template-columns:1fr 1fr}
    .use-grid{grid-template-columns:1fr 1fr}
    .feature-list{grid-template-columns:1fr}
    .tab-btn{font-size:.88rem;padding:12px 8px}
}
/* ===== Responsive: Mobile < 768px ===== */
@media(max-width:768px){
    html{scroll-padding-top:56px}
    .nav-container{height:56px}
    .nav-menu{
        display:none;flex-direction:column;position:fixed;
        top:56px;left:0;right:0;bottom:0;
        background:rgba(255,255,255,.98);backdrop-filter:blur(10px);
        padding:20px;gap:8px;overflow-y:auto;z-index:999
    }
    .nav-menu.open{display:flex}
    .nav-link{padding:12px 20px;font-size:1rem;border-radius:12px}
    .nav-toggle{display:flex}
    .banner{min-height:60vh;padding:100px 16px 60px}
    .banner h1{font-size:1.8rem}
    .banner-subtitle{font-size:1rem}
    .section{padding:56px 0}
    .section h2{font-size:1.5rem;margin-bottom:32px}
    .download-steps-grid,.use-grid{grid-template-columns:1fr}
    .reg-methods{grid-template-columns:1fr}
    .feature-list{grid-template-columns:1fr}
    .intro-grid{flex-direction:column;gap:28px}
    .intro-image img{width:200px;height:200px}
    .intro-image::before{inset:-8px;border-radius:28px}
    .intro-text>p{padding:16px 18px;font-size:1rem}
    .intro-extra{grid-template-columns:1fr;gap:20px}
    .intro-extra-item{padding:24px 20px}
    .banner-btns{flex-direction:column;align-items:center}
    .btn{padding:12px 28px;font-size:.95rem}
    .btn-official{font-size:1rem;padding:14px 32px}
    .official-box{padding:32px 20px}
    .official-url{font-size:1.1rem}
    .footer-links{gap:16px}
    .download-intro{font-size:.95rem;text-align:left}
    .tab-nav{flex-wrap:wrap;gap:4px;padding:4px}
    .tab-btn{flex:1 1 calc(50% - 4px);font-size:.85rem;padding:10px 8px;border-radius:8px}
    .tab-btn .tab-label{display:none}
    .tab-btn .tab-icon{font-size:1.3rem}
    .tab-panel{padding:20px 16px}
    .prep-item{flex-direction:column;gap:8px;padding:16px 18px}
    .step-block{flex-direction:column;gap:8px;padding:18px}
    .step-block-num{font-size:1.3rem}
    .download-pc-note{flex-direction:column;text-align:center}
}

@media(max-width:480px){
    .banner h1{font-size:1.5rem}
    .step-content{padding:16px}
    .step-number{width:40px;height:40px;font-size:1rem}
    .prep-card-header{padding:14px 16px}
    .prep-card-header h4{font-size:1rem}
    .tab-btn{flex:1 1 100%}
    .tab-btn .tab-label{display:inline}
    .tab-panel{padding:14px 10px}
    .reg-card-header{padding:14px 16px}
    .reg-card-body{padding:14px 16px}
    .ts-question{font-size:.93rem;padding:14px 16px}
}