/* =========================================
   艺为微信大屏互动 - 官网落地页样式
   ========================================= */

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: #333; background: #fff; line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Button */
.btn {
    display: inline-block; padding: 12px 28px; border-radius: 6px;
    font-size: 15px; font-weight: 600; cursor: pointer; transition: all 0.3s;
    border: 2px solid transparent; text-align: center;
}
.btn-primary { background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff; }
.btn-primary:hover { background: linear-gradient(135deg, #4f46e5, #7c3aed); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(99,102,241,0.3); }
.btn-outline { border-color: #6366f1; color: #6366f1; background: transparent; }
.btn-outline:hover { background: #6366f1; color: #fff; }
.btn-lg { padding: 16px 40px; font-size: 17px; }
.btn-block { display: block; width: 100%; }

/* Navbar */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,0.95); backdrop-filter: blur(10px);
    box-shadow: 0 1px 10px rgba(0,0,0,0.05); transition: all 0.3s;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.nav-brand { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; color: #6366f1; }
.brand-icon { font-size: 28px; }
.nav-menu { display: flex; gap: 28px; }
.nav-link { font-size: 15px; color: #555; font-weight: 500; transition: color 0.3s; position: relative; }
.nav-link:hover, .nav-link.active { color: #6366f1; }
.nav-link.active::after { content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 2px; background: #6366f1; border-radius: 1px; }
.nav-actions { display: flex; gap: 12px; }
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; }

/* Hero */
.hero {
    position: relative; padding: 160px 0 100px; overflow: hidden;
    background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    color: #fff; min-height: 80vh; display: flex; align-items: center;
}
.hero-bg { position: absolute; inset: 0; overflow: hidden; }
.hero-particles { position: absolute; inset: 0; }
.hero-content { text-align: center; position: relative; z-index: 2; }
.hero-title { font-size: 48px; font-weight: 800; margin-bottom: 20px; line-height: 1.2; }
.hero-subtitle { font-size: 20px; color: rgba(255,255,255,0.8); margin-bottom: 40px; line-height: 1.8; }
.hero-cta { display: flex; gap: 20px; justify-content: center; margin-bottom: 60px; }
.hero-cta .btn-outline { border-color: rgba(255,255,255,0.5); color: #fff; }
.hero-cta .btn-outline:hover { background: rgba(255,255,255,0.15); }
.hero-stats { display: flex; gap: 60px; justify-content: center; }
.stat-item { text-align: center; }
.stat-num { display: block; font-size: 32px; font-weight: 800; color: #a5b4fc; }
.stat-label { font-size: 14px; color: rgba(255,255,255,0.6); }

/* Section */
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-title { font-size: 36px; font-weight: 700; margin-bottom: 12px; color: #1e1b4b; }
.section-desc { font-size: 16px; color: #6b7280; }

/* Features Grid */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
    background: #fff; border: 1px solid #e5e7eb; border-radius: 12px; padding: 32px 24px;
    text-align: center; transition: all 0.3s; cursor: default;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); border-color: #c7d2fe; }
.feature-icon { font-size: 40px; margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; color: #1e1b4b; }
.feature-card p { font-size: 14px; color: #6b7280; line-height: 1.6; }

/* Advantages */
.advantages { background: #f8fafc; }
.advantage-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.advantage-card {
    background: #fff; border-radius: 12px; padding: 36px 24px; text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.04); transition: all 0.3s;
}
.advantage-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,0,0,0.08); }
.advantage-icon { font-size: 44px; margin-bottom: 16px; }
.advantage-card h3 { font-size: 18px; margin-bottom: 8px; color: #1e1b4b; }
.advantage-card p { font-size: 14px; color: #6b7280; }

/* Scenes */
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.scene-card {
    background: #fff; border-radius: 12px; overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06); transition: all 0.3s;
}
.scene-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.1); }
.scene-img { font-size: 60px; text-align: center; padding: 30px 0; background: linear-gradient(135deg, #e0e7ff, #f0f0ff); }
.scene-info { padding: 20px; }
.scene-info h3 { font-size: 18px; margin-bottom: 8px; color: #1e1b4b; }
.scene-info p { font-size: 14px; color: #6b7280; margin-bottom: 12px; }
.scene-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag { padding: 4px 10px; background: #eef2ff; color: #6366f1; border-radius: 4px; font-size: 12px; }

/* Pricing */
.pricing { background: #f8fafc; }
.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.pricing-card {
    background: #fff; border-radius: 16px; padding: 36px 28px; position: relative;
    border: 2px solid #e5e7eb; transition: all 0.3s; text-align: center;
}
.pricing-card:hover { border-color: #c7d2fe; }
.pricing-card.popular { border-color: #6366f1; transform: scale(1.03); }
.popular-badge {
    position: absolute; top: -12px; right: 20px; background: #6366f1; color: #fff;
    padding: 4px 16px; border-radius: 12px; font-size: 13px; font-weight: 600;
}
.pricing-header h3 { font-size: 20px; color: #1e1b4b; margin-bottom: 12px; }
.pricing-price { margin-bottom: 24px; }
.price-currency { font-size: 20px; color: #6366f1; vertical-align: top; }
.price-amount { font-size: 42px; font-weight: 800; color: #6366f1; }
.price-period { font-size: 14px; color: #9ca3af; }
.pricing-features { margin-bottom: 28px; text-align: left; }
.pricing-features li { padding: 8px 0; font-size: 14px; color: #4b5563; border-bottom: 1px solid #f3f4f6; }

/* Quick Start */
.quickstart { background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff; }
.quickstart .section-title { color: #fff; }
.quickstart .section-desc { color: rgba(255,255,255,0.8); }
.steps { display: flex; align-items: center; justify-content: center; gap: 20px; margin-bottom: 40px; }
.step {
    text-align: center; background: rgba(255,255,255,0.12); border-radius: 16px;
    padding: 36px 28px; width: 240px; backdrop-filter: blur(5px);
}
.step-num { font-size: 14px; font-weight: 700; background: rgba(255,255,255,0.2); display: inline-block; width: 30px; height: 30px; line-height: 30px; border-radius: 50%; margin-bottom: 12px; }
.step-icon { font-size: 40px; margin-bottom: 12px; }
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { font-size: 14px; color: rgba(255,255,255,0.8); }
.step-arrow { font-size: 28px; color: rgba(255,255,255,0.5); }
.steps-cta { text-align: center; }
.steps-cta .btn-primary { background: #fff; color: #6366f1; }
.steps-cta .btn-primary:hover { background: #f0f0ff; }

/* Cases */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card { background: #fff; border-radius: 12px; padding: 28px; box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
.case-type { display: inline-block; padding: 4px 12px; background: #eef2ff; color: #6366f1; border-radius: 4px; font-size: 12px; font-weight: 600; margin-bottom: 12px; }
.case-card h3 { font-size: 18px; margin-bottom: 8px; color: #1e1b4b; }
.case-card p { font-size: 14px; color: #6b7280; margin-bottom: 16px; }
.case-stats { display: flex; gap: 16px; font-size: 13px; color: #9ca3af; }

/* FAQ */
.faq-list { max-width: 700px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid #e5e7eb; }
.faq-q { display: flex; justify-content: space-between; align-items: center; padding: 18px 0; cursor: pointer; font-weight: 500; font-size: 16px; }
.faq-arrow { transition: transform 0.3s; color: #9ca3af; }
.faq-item.open .faq-arrow { transform: rotate(90deg); }
.faq-a { display: none; padding: 0 0 18px; font-size: 14px; color: #6b7280; }
.faq-item.open .faq-a { display: block; }

/* Footer */
.footer { background: #1e1b4b; color: #d1d5db; padding: 60px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .brand-logo { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; color: #9ca3af; }
.footer-links h4, .footer-contact h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer-links a { display: block; font-size: 14px; color: #9ca3af; margin-bottom: 8px; transition: color 0.3s; }
.footer-links a:hover { color: #a5b4fc; }
.footer-contact p { font-size: 14px; margin-bottom: 8px; }
.footer-bottom { text-align: center; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.1); }
.footer-bottom p { font-size: 13px; color: #6b7280; }

/* Responsive */
@media (max-width: 1024px) {
    .feature-grid, .scene-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
    .advantage-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .nav-menu, .nav-actions { display: none; }
    .nav-toggle { display: block; }
    .navbar.open .nav-menu { display: flex; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0; background: #fff; padding: 20px; box-shadow: 0 4px 20px rgba(0,0,0,0.1); }
    .navbar.open .nav-actions { display: flex; position: absolute; top: 70px; right: 20px; }
    .hero-title { font-size: 32px; }
    .hero-subtitle { font-size: 16px; }
    .hero-stats { gap: 30px; }
    .stat-num { font-size: 24px; }
    .feature-grid, .scene-grid, .case-grid, .advantage-grid, .pricing-grid { grid-template-columns: 1fr; }
    .steps { flex-direction: column; }
    .step-arrow { transform: rotate(90deg); }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .section { padding: 50px 0; }
    .section-title { font-size: 28px; }
    .pricing-card.popular { transform: none; }
}