/* 全局重置与变量 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #1a1a2e;
    --secondary: #16213e;
    --accent: #f5c518;
    --accent2: #e2a80f;
    --text: #e0e0e0;
    --text2: #a0a0b0;
    --bg: #0f0f1a;
    --card: #1e1e36;
    --card2: #252545;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --transition: 0.3s ease;
    --glass-bg: rgba(15,15,26,0.6);
    --glass-border: rgba(245,197,24,0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--accent2);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* 滚动动画基础 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    transition: background var(--transition);
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    padding-bottom: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
}

.logo svg {
    width: 36px;
    height: 36px;
}

nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

nav a {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    transition: background var(--transition), color var(--transition);
}

nav a:hover,
nav a[aria-current="page"] {
    background: rgba(245,197,24,0.12);
    color: var(--accent);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.6rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
}

.menu-toggle:hover {
    background: rgba(245,197,24,0.1);
}

/* Hero 渐变Banner */
.hero {
    padding: 80px 0 60px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, #0d1b2a 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(245,197,24,0.08) 0%, transparent 50%);
    pointer-events: none;
    animation: heroGlow 6s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(10%, 10%) scale(1.1); }
}

.hero .container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
}

.hero h1 span {
    color: var(--accent);
}

.hero p {
    font-size: 1.1rem;
    color: var(--text2);
    margin-bottom: 24px;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--accent);
    color: var(--primary);
}

.btn-primary:hover {
    background: var(--accent2);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245,197,24,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

.btn-outline:hover {
    background: rgba(245,197,24,0.1);
    transform: translateY(-2px);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-visual svg {
    width: 100%;
    max-width: 480px;
    height: auto;
}

/* 通用Sections */
section {
    padding: 60px 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--accent);
    margin-top: 8px;
    border-radius: 2px;
}

.section-subtitle {
    color: var(--text2);
    font-size: 1.05rem;
    margin-bottom: 40px;
    max-width: 600px;
}

.text-center {
    text-align: center;
}

.text-center .section-title::after {
    margin-left: auto;
    margin-right: auto;
}

/* 圆角卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 28px;
    transition: all var(--transition);
    border: 1px solid rgba(255,255,255,0.03);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: rgba(245,197,24,0.1);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: rgba(245,197,24,0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.card p {
    color: var(--text2);
    font-size: 0.95rem;
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.about-content h2 {
    font-size: 2rem;
    margin-bottom: 16px;
}

.about-content p {
    color: var(--text2);
    margin-bottom: 16px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 24px;
}

.stat-item {
    text-align: center;
    padding: 16px;
    background: var(--card);
    border-radius: var(--radius);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text2);
    margin-top: 4px;
}

/* Services */
.service-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.service-item {
    background: var(--card);
    border-radius: var(--radius);
    padding: 28px;
    border: 1px solid rgba(255,255,255,0.03);
    transition: all var(--transition);
}

.service-item:hover {
    border-color: rgba(245,197,24,0.15);
    transform: translateY(-2px);
}

.service-item h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.service-item p {
    color: var(--text2);
    font-size: 0.95rem;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.03);
    transition: border-color var(--transition);
}

.faq-item[open] {
    border-color: rgba(245,197,24,0.2);
}

.faq-question {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.05rem;
    transition: background var(--transition);
}

.faq-question:hover {
    background: rgba(245,197,24,0.05);
}

.faq-question .icon {
    font-size: 1.2rem;
    transition: transform var(--transition);
}

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

.faq-answer {
    padding: 0 24px 20px;
    color: var(--text2);
    line-height: 1.7;
}

/* HowTo */
.howto-steps {
    max-width: 700px;
    margin: 0 auto;
    counter-reset: step;
}

.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    align-items: flex-start;
}

.howto-step::before {
    counter-increment: step;
    content: counter(step);
    background: var(--accent);
    color: var(--primary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1rem;
    flex-shrink: 0;
}

.howto-step-content h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.howto-step-content p {
    color: var(--text2);
}

/* Articles */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.article-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    transition: all var(--transition);
    border: 1px solid rgba(255,255,255,0.03);
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: rgba(245,197,24,0.1);
    box-shadow: var(--shadow);
}

.article-card .date {
    font-size: 0.85rem;
    color: var(--text2);
    margin-bottom: 8px;
}

.article-card h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.article-card p {
    color: var(--text2);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.article-card .read-more {
    font-weight: 600;
    color: var(--accent);
}

/* Testimonials */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.testimonial-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 28px;
    border: 1px solid rgba(255,255,255,0.03);
    transition: all var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-2px);
    border-color: rgba(245,197,24,0.1);
}

.testimonial-card .quote {
    font-style: italic;
    color: var(--text2);
    margin-bottom: 16px;
}

.testimonial-card .author {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.testimonial-card .author span {
    font-weight: 400;
    color: var(--text2);
    font-size: 0.9rem;
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info h3 {
    font-size: 1.3rem;
    margin-bottom: 16px;
}

.contact-info p {
    color: var(--text2);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.contact-form {
    display: grid;
    gap: 16px;
}

.contact-form label {
    font-weight: 500;
    font-size: 0.95rem;
}

.contact-form input,
.contact-form textarea {
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    background: var(--card);
    color: var(--text);
    font-size: 1rem;
    transition: border var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.contact-form textarea {
    min-height: 120px;
    resize: vertical;
}

/* Footer */
footer {
    background: var(--primary);
    border-top: 1px solid rgba(255,255,255,0.05);
    padding: 40px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--accent);
}

.footer-col a,
.footer-col p {
    display: block;
    color: var(--text2);
    font-size: 0.9rem;
    margin-bottom: 6px;
    transition: color var(--transition);
}

.footer-col a:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.05);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text2);
}

.footer-bottom a {
    color: var(--text2);
}

.footer-bottom a:hover {
    color: var(--accent);
}

/* Back to top */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--primary);
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    z-index: 99;
}

.back-to-top.visible {
    display: flex;
}

.back-to-top:hover {
    transform: scale(1.1);
}

/* Dark mode toggle */
.dark-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.3rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background var(--transition);
}

.dark-toggle:hover {
    background: rgba(245,197,24,0.1);
}

/* 响应式 */
@media (max-width: 768px) {
    nav {
        display: none;
        flex-direction: column;
        width: 100%;
        background: var(--primary);
        padding: 16px;
        border-radius: var(--radius);
        margin-top: 12px;
    }

    nav.open {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        margin: 0 auto 24px;
    }

    .hero-actions {
        justify-content: center;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.6rem;
    }

    footer .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }

    footer .footer-grid {
        grid-template-columns: 1fr;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
}

/* 浅色模式 */
body.light {
    --primary: #f8f9fa;
    --secondary: #e9ecef;
    --accent: #e2a80f;
    --accent2: #c9940a;
    --text: #1a1a2e;
    --text2: #495057;
    --bg: #ffffff;
    --card: #f1f3f5;
    --card2: #e9ecef;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --glass-bg: rgba(255,255,255,0.7);
    --glass-border: rgba(226,168,15,0.15);
}

body.light header {
    background: var(--glass-bg);
}

body.light .hero {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 50%, #dee2e6 100%);
}

body.light .stat-number {
    color: var(--accent2);
}

body.light .btn-primary {
    color: #fff;
}

body.light .back-to-top {
    color: #fff;
}