/* ============================================
   大亨去水印 - 样式表
   蓝紫渐变科技感风格 | SEO友好
   ============================================ */

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #8b5cf6;
    --cyan: #06b6d4;
    --amber: #f59e0b;
    --gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-light: linear-gradient(135deg, rgba(59,130,246,0.06) 0%, rgba(139,92,246,0.06) 100%);
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-card: #ffffff;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --radius: 14px;
    --radius-lg: 20px;
    --shadow: 0 4px 24px rgba(59,130,246,0.08);
    --shadow-lg: 0 12px 48px rgba(59,130,246,0.12);
    --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
    --max-width: 1200px;
    --header-height: 70px;
}

*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; display: block; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section { padding: 100px 0; }

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text);
    letter-spacing: -0.5px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 60px;
}

/* ============================================
   按钮
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 20px rgba(59,130,246,0.35);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(59,130,246,0.45);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background: var(--gradient-light);
    transform: translateY(-2px);
}

.btn-sm { padding: 10px 22px; font-size: 0.85rem; }
.btn-lg { padding: 18px 40px; font-size: 1.05rem; }

/* ============================================
   导航
   ============================================ */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-height);
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 1px 16px rgba(0,0,0,0.06);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
}

.logo-icon-wrap { flex-shrink: 0; }

.logo-text {
    font-size: 1.3rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    align-items: center;
    gap: 2px;
}

.nav-link {
    padding: 10px 18px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
}
.nav-link:hover { color: var(--primary); background: var(--gradient-light); }

.header-actions { display: flex; align-items: center; gap: 12px; }

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none; border: none; cursor: pointer;
    padding: 4px; z-index: 1001;
}
.mobile-toggle span {
    display: block;
    width: 24px; height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ============================================
   Hero 英雄区
   ============================================ */
.hero {
    padding: 170px 0 100px;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.hero-bg {
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59,130,246,0.1) 0%, transparent 70%),
        radial-gradient(ellipse 50% 40% at 15% 90%, rgba(139,92,246,0.06) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 85% 90%, rgba(6,182,212,0.06) 0%, transparent 60%);
    z-index: 0;
}

.hero-content { position: relative; z-index: 1; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #eff6ff;
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 8px 20px;
    border-radius: 50px;
    margin-bottom: 28px;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 900;
    line-height: 1.25;
    margin-bottom: 24px;
    color: var(--text);
    letter-spacing: -1px;
}
.hero-title .highlight {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 620px;
    margin: 0 auto 36px;
    line-height: 1.9;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
}

.hero-stat {
    text-align: center;
}
.hero-stat strong {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-stat span {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* ============================================
   功能卡片
   ============================================ */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: transparent;
}

.feature-visual {
    background: var(--bg-alt);
    padding: 28px 20px 20px;
}

.compare-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.compare-side {
    position: relative;
    text-align: center;
}

.compare-thumb {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.compare-tag {
    display: block;
    font-size: 0.72rem;
    color: var(--text-light);
    margin-top: 6px;
}
.compare-tag.after {
    color: var(--primary);
    font-weight: 600;
}

.compare-arrow-icon {
    font-size: 1.3rem;
    color: var(--primary);
    font-weight: 700;
    margin: 0 4px;
}

.feature-body {
    padding: 24px;
    text-align: center;
}

.feature-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 10px;
}

.feature-body h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-body p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   为什么选择我们
   ============================================ */
.why-us { background: var(--bg-alt); }

.why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.why-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px 28px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
}
.why-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: transparent;
}

.why-icon {
    margin: 0 auto 20px;
    display: flex;
    justify-content: center;
}

.why-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.why-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   数据统计
   ============================================ */
.stats {
    background: var(--gradient);
    padding: 72px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item { color: #fff; }

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1;
}

.stat-unit {
    font-size: 1.5rem;
    font-weight: 500;
    margin-left: 2px;
}

.stat-label {
    margin-top: 10px;
    font-size: 0.95rem;
    opacity: 0.85;
}

/* ============================================
   使用教程步骤
   ============================================ */
.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    max-width: 900px;
    margin: 0 auto;
}

.step {
    text-align: center;
    flex: 1;
}

.step-number {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.step-icon-wrap {
    width: 96px;
    height: 96px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.step h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.step p {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.step-connector {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 70px;
    flex-shrink: 0;
}

/* ============================================
   用户评价
   ============================================ */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
    transition: var(--transition);
}
.testimonial-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.testimonial-stars {
    color: #f59e0b;
    font-size: 1.15rem;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.testimonial-card blockquote {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 20px;
    font-style: normal;
    quotes: none;
}

.testimonial-card figcaption {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    font-weight: 700;
    flex-shrink: 0;
}

.testimonial-card figcaption strong {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
}
.testimonial-card figcaption span {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ============================================
   CTA 区域
   ============================================ */
.cta { background: var(--bg-alt); }

.cta-box {
    background: #fff;
    border-radius: 24px;
    padding: 60px 40px;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.cta-content h2 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.cta-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 36px;
}

.cta-methods {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 40px;
    margin-bottom: 32px;
}

.cta-method {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.cta-qr {
    display: inline-block;
    padding: 12px;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.06);
    margin-bottom: 16px;
}

.cta-search {
    display: inline-block;
    padding: 12px;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.06);
    margin-bottom: 16px;
}

.cta-method p { font-size: 0.9rem; color: var(--text-secondary); }
.cta-method strong { color: var(--text); font-size: 1rem; }

.cta-divider {
    display: flex;
    align-items: center;
    align-self: stretch;
}

.cta-divider span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-alt);
    color: var(--text-light);
    font-size: 0.85rem;
}

.cta-platforms { font-size: 0.85rem; color: var(--text-light); }

/* ============================================
   FAQ
   ============================================ */
.faq-list {
    max-width: 720px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    user-select: none;
}
.faq-question::-webkit-details-marker { display: none; }

.faq-arrow {
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.faq-item[open] .faq-arrow {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 24px 20px;
}

.faq-answer p {
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1.5fr 1.5fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo strong {
    font-size: 1.15rem;
    color: #fff;
}

.footer-brand p {
    font-size: 0.88rem;
    line-height: 1.8;
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col a {
    display: block;
    color: #94a3b8;
    font-size: 0.88rem;
    padding: 5px 0;
    transition: var(--transition);
}
.footer-col a:hover {
    color: #60a5fa;
    padding-left: 4px;
}

.footer-contact p {
    font-size: 0.88rem;
    margin-bottom: 8px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    color: #64748b;
}

.footer-friends {
    margin-top: 10px;
}
.footer-friends a { color: #64748b; }
.footer-friends a:hover { color: #60a5fa; }

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in-up { animation: fadeInUp 0.6s ease forwards; }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .why-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    :root { --header-height: 60px; }

    .nav {
        position: fixed;
        top: 0; right: -100%;
        width: 280px; height: 100vh;
        background: #fff;
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 24px 24px;
        box-shadow: -4px 0 24px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        gap: 2px;
        overflow-y: auto;
    }
    .nav.open { right: 0; }
    .nav-link { width: 100%; padding: 14px 16px; font-size: 1rem; }
    .mobile-toggle { display: flex; }

    .hero { padding: 140px 0 72px; }
    .hero-title { font-size: 2.2rem; }
    .hero-desc { font-size: 1rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-stats { gap: 28px; flex-wrap: wrap; }

    .feature-grid { grid-template-columns: 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .testimonial-grid { grid-template-columns: 1fr; }

    .steps { flex-direction: column; gap: 0; }
    .step-connector { transform: rotate(90deg); padding-top: 8px; }

    .cta-methods { flex-direction: column; gap: 24px; }
    .cta-divider span { transform: rotate(90deg); }

    .section { padding: 64px 0; }
    .section-title { font-size: 1.65rem; }
    .section-subtitle { font-size: 0.95rem; margin-bottom: 40px; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-title { font-size: 1.75rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .stat-number { font-size: 2.2rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .cta-box { padding: 40px 20px; }
}