/* ===== 全局重置 ===== */
* {margin: 0; padding: 0; box-sizing: border-box;}

:root {
    --color-primary: #3b82f6;
    --color-secondary: #8b5cf6;
    --color-accent: #f59e0b;
    --color-success: #10b981;
    --color-bg-dark: #0f172a;
    --color-bg-medium: #1e293b;
    --color-bg-light: #334155;
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
}

html {scroll-behavior: smooth; overflow-x: hidden;}
body {font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif; line-height: 1.7; color: var(--color-text-primary); background-color: var(--color-bg-dark); overflow-x: hidden;}
.container-wide {max-width: 1280px; margin: 0 auto; padding: 0 24px;}
.container-narrow {max-width: 900px; margin: 0 auto; padding: 0 24px;}

/* ===== 顶部导航 ===== */
.header {position: fixed; top: 0; left: 0; right: 0; z-index: 999; background: rgba(15, 23, 42, 0.9); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(255, 255, 255, 0.08);}
.navbar {padding: 18px 0;}
.nav-container {max-width: 1280px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between;}
.brand {display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--color-text-primary); font-weight: 700; font-size: 1.4rem;}
.brand-icon {font-size: 1.6rem; color: var(--color-primary);}
.nav-links {display: flex; list-style: none; gap: 40px;}
.nav-link {color: var(--color-text-secondary); text-decoration: none; font-weight: 500; transition: color 0.3s; position: relative;}
.nav-link::after {content: ''; position: absolute; bottom: -5px; left: 0; width: 0; height: 2px; background: var(--gradient-primary); transition: width 0.3s;}
.nav-link:hover {color: var(--color-primary);}
.nav-link:hover::after {width: 100%;}
.nav-actions {display: flex; align-items: center; gap: 20px;}
.btn-nav {padding: 10px 24px; background: var(--gradient-primary); color: white; text-decoration: none; border-radius: 8px; font-weight: 600; transition: all 0.3s;}
.btn-nav:hover {transform: translateY(-2px); box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);}
.hamburger {display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px;}
.hamburger span {width: 24px; height: 2px; background: var(--color-text-primary); transition: all 0.3s;}

/* ===== Hero 分屏设计 ===== */
.hero-split {min-height: 100vh; display: grid; grid-template-columns: 1fr 1fr; align-items: center; padding-top: 80px; gap: 60px;}
.hero-left {padding: 60px 40px 60px 80px;}
.hero-badge {display: inline-block; padding: 8px 16px; background: rgba(59, 130, 246, 0.1); border: 1px solid rgba(59, 130, 246, 0.3); border-radius: 20px; color: var(--color-primary); font-size: 0.9rem; font-weight: 600; margin-bottom: 24px;}
.hero-heading {font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 800; line-height: 1.2; margin-bottom: 24px;}
.gradient-text {background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;}
.hero-description {font-size: 1.15rem; line-height: 1.8; color: var(--color-text-secondary); margin-bottom: 40px;}
.hero-buttons {display: flex; gap: 16px; margin-bottom: 60px;}
.btn {padding: 14px 32px; border-radius: 10px; text-decoration: none; font-weight: 600; font-size: 1rem; transition: all 0.3s; display: inline-block;}
.btn-hero-primary {background: var(--gradient-primary); color: white; box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);}
.btn-hero-primary:hover {transform: translateY(-3px); box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4);}
.btn-hero-secondary {background: transparent; color: var(--color-text-primary); border: 2px solid rgba(255, 255, 255, 0.2);}
.btn-hero-secondary:hover {background: rgba(255, 255, 255, 0.05); border-color: rgba(255, 255, 255, 0.4);}
.hero-stats {display: flex; gap: 40px; align-items: center;}
.stat-item {text-align: center;}
.stat-value {font-size: 2rem; font-weight: 800; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 4px;}
.stat-label {font-size: 0.9rem; color: var(--color-text-secondary);}
.stat-divider {width: 1px; height: 40px; background: rgba(255, 255, 255, 0.1);}
.hero-right {padding: 60px 80px 60px 40px; display: flex; align-items: center; justify-content: center;}
.hero-visual {position: relative; width: 100%; max-width: 500px; height: 500px;}
.floating-card {position: absolute; background: var(--color-bg-medium); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 16px; padding: 20px; display: flex; align-items: center; gap: 15px; box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3); animation: floatCard 6s infinite ease-in-out;}
.card-1 {top: 10%; left: 0; animation-delay: 0s;}
.card-2 {top: 45%; right: 0; animation-delay: 2s;}
.card-3 {bottom: 10%; left: 20%; animation-delay: 4s;}
.card-icon {font-size: 2.5rem;}
.card-text strong {display: block; font-size: 1.1rem; margin-bottom: 4px;}
.card-text span {font-size: 0.9rem; color: var(--color-text-secondary);}
.price-up {color: var(--color-success);}
@keyframes floatCard {0%, 100% {transform: translateY(0);} 50% {transform: translateY(-20px);}}

/* ===== 核心优势区 ===== */
.benefits-section {padding: 120px 0; background: var(--color-bg-dark);}
.section-intro {text-align: center; margin-bottom: 80px;}
.section-heading {font-size: clamp(2rem, 4vw, 3.5rem); font-weight: 800; margin-bottom: 16px;}
.section-subheading {font-size: 1.2rem; color: var(--color-text-secondary);}
.benefits-grid {display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 30px;}
.benefit-card {background: var(--color-bg-medium); border: 1px solid rgba(255, 255, 255, 0.05); border-radius: 16px; padding: 40px; transition: all 0.3s;}
.benefit-card:hover {transform: translateY(-8px); box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3); border-color: var(--color-primary);}
.benefit-icon-wrap {margin-bottom: 24px;}
.benefit-icon {font-size: 3.5rem;}
.benefit-title {font-size: 1.5rem; font-weight: 700; margin-bottom: 16px;}
.benefit-desc {color: var(--color-text-secondary); line-height: 1.8;}
.card-accent-1:hover {border-color: #3b82f6;}
.card-accent-2:hover {border-color: #8b5cf6;}
.card-accent-3:hover {border-color: #f59e0b;}
.card-accent-4:hover {border-color: #10b981;}
.card-accent-5:hover {border-color: #ef4444;}
.card-accent-6:hover {border-color: #06b6d4;}

/* ===== 下载区 ===== */
.download-section {padding: 120px 0; background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);}
.download-grid {display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px;}
.download-card {background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 20px; padding: 40px; position: relative; transition: all 0.3s;}
.download-card:hover {transform: translateY(-8px); box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);}
.download-card.featured {border-color: var(--color-primary); box-shadow: 0 8px 32px rgba(59, 130, 246, 0.2);}
.featured-badge {position: absolute; top: 20px; right: 20px; padding: 6px 14px; background: var(--gradient-primary); border-radius: 12px; font-size: 0.85rem; font-weight: 600;}
.download-header {display: flex; align-items: center; gap: 16px; margin-bottom: 20px;}
.download-icon {font-size: 3rem;}
.download-header h3 {font-size: 1.8rem; font-weight: 700;}
.download-desc {color: var(--color-text-secondary); line-height: 1.8; margin-bottom: 24px;}
.download-features {list-style: none; margin-bottom: 32px;}
.download-features li {padding: 8px 0; color: var(--color-text-secondary);}
.btn-download {display: block; width: 100%; text-align: center; padding: 14px; background: var(--gradient-primary); color: white; text-decoration: none; border-radius: 10px; font-weight: 600; transition: all 0.3s; margin-bottom: 12px;}
.btn-download:hover {transform: translateY(-2px); box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);}
.download-buttons {display: flex; flex-direction: column; gap: 12px;}

/* ===== 使用教程区 ===== */
.tutorial-section {padding: 120px 0; background: var(--color-bg-dark);}
.tutorial-timeline {position: relative; max-width: 800px; margin: 0 auto;}
.tutorial-step {display: grid; grid-template-columns: 80px 1fr; gap: 40px; margin-bottom: 60px;}
.step-indicator {display: flex; flex-direction: column; align-items: center;}
.step-circle {width: 60px; height: 60px; border-radius: 50%; background: var(--gradient-primary); display: flex; align-items: center; justify-content: center; font-size: 1.8rem; font-weight: 800; color: white;}
.step-line {width: 2px; height: 100%; background: rgba(59, 130, 246, 0.3); margin-top: 12px;}
.tutorial-step:last-child .step-line {display: none;}
.step-content-box {background: var(--color-bg-medium); border: 1px solid rgba(255, 255, 255, 0.05); border-radius: 16px; padding: 32px;}
.step-title {font-size: 1.8rem; font-weight: 700; margin-bottom: 16px;}
.step-description {color: var(--color-text-secondary); line-height: 1.8; margin-bottom: 20px;}
.step-tips {padding: 16px; background: rgba(59, 130, 246, 0.1); border-left: 3px solid var(--color-primary); border-radius: 8px; color: var(--color-text-secondary);}
.step-tips strong {color: var(--color-primary);}

/* ===== FAQ 区域 ===== */
.faq-section-alt {padding: 120px 0; background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);}
.faq-list {display: flex; flex-direction: column; gap: 20px;}
.faq-box {background: var(--color-bg-medium); border: 1px solid rgba(255, 255, 255, 0.05); border-radius: 12px; overflow: hidden; transition: all 0.3s;}
.faq-box[open] {border-color: var(--color-primary); box-shadow: 0 8px 32px rgba(59, 130, 246, 0.15);}
.faq-summary {padding: 24px 28px; display: flex; justify-content: space-between; align-items: center; cursor: pointer; list-style: none; font-size: 1.15rem; font-weight: 600; user-select: none;}
.faq-summary::-webkit-details-marker {display: none;}
.faq-summary:hover {background: rgba(255, 255, 255, 0.03);}
.faq-toggle {font-size: 1.5rem; color: var(--color-primary); transition: transform 0.3s;}
.faq-box[open] .faq-toggle {transform: rotate(45deg);}
.faq-content {padding: 0 28px 24px; color: var(--color-text-secondary); line-height: 1.8; animation: fadeIn 0.3s;}
@keyframes fadeIn {from {opacity: 0; transform: translateY(-10px);} to {opacity: 1; transform: translateY(0);}}

/* ===== 页脚 ===== */
.main-footer {background: var(--color-bg-medium); padding: 80px 0 30px; border-top: 1px solid rgba(255, 255, 255, 0.08);}
.footer-top {display: grid; grid-template-columns: 2fr 3fr; gap: 60px; margin-bottom: 60px;}
.footer-logo {display: flex; align-items: center; gap: 10px; font-size: 1.8rem; font-weight: 700; margin-bottom: 16px;}
.footer-motto {color: var(--color-text-secondary); margin-bottom: 32px;}
.footer-social {display: flex; gap: 12px;}
.social-btn {width: 42px; height: 42px; border-radius: 50%; background: rgba(255, 255, 255, 0.05); display: flex; align-items: center; justify-content: center; color: var(--color-text-primary); transition: all 0.3s;}
.social-btn:hover {background: var(--color-primary); transform: translateY(-3px);}
.footer-links-section {display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px;}
.footer-heading {font-size: 1.1rem; font-weight: 700; margin-bottom: 20px;}
.footer-menu {list-style: none;}
.footer-menu li {margin-bottom: 12px;}
.footer-menu a {color: var(--color-text-secondary); text-decoration: none; transition: color 0.3s;}
.footer-menu a:hover {color: var(--color-primary);}
.footer-bottom {display: flex; justify-content: space-between; align-items: center; padding-top: 40px; border-top: 1px solid rgba(255, 255, 255, 0.05);}
.copyright {color: var(--color-text-secondary);}
.scroll-top {width: 48px; height: 48px; border-radius: 50%; background: var(--gradient-primary); border: none; color: white; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.3s;}
.scroll-top:hover {transform: translateY(-5px); box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4);}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero-split {grid-template-columns: 1fr; padding-top: 100px;}
    .hero-left, .hero-right {padding: 40px;}
    .hero-visual {max-width: 400px; height: 400px;}
    .benefits-grid, .download-grid {grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));}
    .footer-top {grid-template-columns: 1fr;}
}

@media (max-width: 768px) {
    .nav-links {display: none;}
    .hamburger {display: flex;}
    .hero-buttons {flex-direction: column;}
    .hero-stats {flex-direction: column; gap: 24px;}
    .stat-divider {display: none;}
    .tutorial-step {grid-template-columns: 1fr; gap: 20px;}
    .step-indicator {flex-direction: row; justify-content: flex-start;}
    .step-line {width: 100%; height: 2px; margin-top: 0; margin-left: 12px;}
    .footer-links-section {grid-template-columns: 1fr;}
    .footer-bottom {flex-direction: column; gap: 20px; text-align: center;}
}