/* ========== 全局重置与变量 ========== */
:root {
    /* 主色调 – 渐变Banner用 */
    --primary: #1a1a2e;
    --secondary: #16213e;
    --accent1: #e94560;
    --accent2: #0f3460;
    --gradient-bg: linear-gradient(135deg, #0f3460 0%, #1a1a2e 50%, #16213e 100%);
    --card-bg: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.18);
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0c0;
    --text-muted: #7a7a8a;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s ease;
    --font: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

/* 暗色模式（默认即为暗色，无需媒体查询） */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font);
    background: var(--primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ========== 滚动动画 (Intersection Observer 配合) ========== */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 头部导航 ========== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(26, 26, 46, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    transition: background var(--transition);
}

nav[aria-label="主导航"] {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.6rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent1), #f9a826);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 1px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.4rem 0;
    position: relative;
    transition: color var(--transition);
}

nav ul li a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: var(--accent1);
    transition: width var(--transition);
}

nav ul li a:hover {
    color: var(--text-primary);
}

nav ul li a:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.8rem;
    cursor: pointer;
    padding: 0.2rem;
    transition: transform var(--transition);
}

.mobile-menu-toggle:hover {
    transform: scale(1.1);
}

/* ========== Hero 渐变Banner ========== */
#hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 6rem 1.5rem 4rem;
    background: var(--gradient-bg);
    position: relative;
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(233, 69, 96, 0.15) 0%, transparent 60%),
                radial-gradient(circle at 70% 80%, rgba(15, 52, 96, 0.3) 0%, transparent 50%);
    pointer-events: none;
    animation: heroGlow 12s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0, 0); }
    100% { transform: translate(5%, 5%); }
}

#hero h1 {
    font-size: clamp(2.2rem, 6vw, 4rem);
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff, #f0e6ff, #e94560);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 20px rgba(233, 69, 96, 0.3);
}

#hero p {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
    line-height: 1.7;
}

.cta-button {
    display: inline-block;
    padding: 0.9rem 2.8rem;
    background: linear-gradient(135deg, var(--accent1), #f9a826);
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 8px 25px rgba(233, 69, 96, 0.4);
    transition: all var(--transition);
    position: relative;
    z-index: 1;
    letter-spacing: 0.5px;
}

.cta-button:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 12px 35px rgba(233, 69, 96, 0.6);
}

/* ========== 通用 Section ========== */
section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 5rem 1.5rem;
    scroll-margin-top: 80px;
}

section h2 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 700;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #fff, #e94560);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
}

section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent1), transparent);
    margin-top: 0.5rem;
    border-radius: 4px;
}

section p {
    color: var(--text-secondary);
    max-width: 800px;
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
}

/* ========== 圆角卡片 + 毛玻璃 ========== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

article, .faq-item {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 1.8rem 1.5rem;
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

article:hover, .faq-item:hover {
    transform: translateY(-6px);
    border-color: rgba(233, 69, 96, 0.4);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

article h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
    font-weight: 600;
}

article p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========== 服务列表 ========== */
#services ul {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

#services ul li {
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 1.2rem 1.5rem;
    transition: all var(--transition);
}

#services ul li:hover {
    transform: translateY(-4px);
    border-color: var(--accent1);
}

#services ul li strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.3rem;
}

/* ========== HowTo 有序列表 ========== */
#howto ol {
    list-style: none;
    counter-reset: step;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

#howto ol li {
    counter-increment: step;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 1.2rem 1.5rem 1.2rem 3rem;
    position: relative;
    flex: 1 1 200px;
    transition: all var(--transition);
}

#howto ol li:hover {
    transform: translateY(-4px);
    border-color: var(--accent1);
}

#howto ol li::before {
    content: counter(step);
    position: absolute;
    left: 1rem;
    top: 1.2rem;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--accent1);
    background: rgba(233, 69, 96, 0.15);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ========== FAQ 手风琴 ========== */
.faq-item {
    margin-bottom: 1rem;
    padding: 0;
    overflow: hidden;
}

.faq-toggle {
    width: 100%;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 600;
    padding: 1.2rem 1.5rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color var(--transition);
}

.faq-toggle::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--accent1);
    transition: transform 0.3s ease;
}

.faq-toggle[aria-expanded="true"]::after {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.5rem 1.2rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.faq-answer[hidden] {
    display: none;
}

/* ========== 相关文章 ========== */
#articles ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

#articles ul li article {
    padding: 1.2rem;
}

#articles ul li article h3 {
    font-size: 1.1rem;
}

#articles ul li article time {
    display: block;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 0.5rem 0;
}

#articles ul li article a {
    color: var(--accent1);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

#articles ul li article a:hover {
    color: #f9a826;
    text-decoration: underline;
}

/* ========== 联系 ========== */
#contact address p {
    color: var(--text-secondary);
    margin-bottom: 0.6rem;
    font-style: normal;
}

/* ========== 页脚 ========== */
footer {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--glass-border);
    padding: 2.5rem 1.5rem 1.5rem;
    text-align: center;
}

footer nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

footer nav ul li a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition);
}

footer nav ul li a:hover {
    color: var(--accent1);
}

footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
    header {
        padding: 0;
    }

    nav[aria-label="主导航"] {
        padding: 0.6rem 1rem;
    }

    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(26, 26, 46, 0.95);
        backdrop-filter: blur(16px);
        padding: 1rem 0;
        gap: 0.5rem;
        border-bottom: 1px solid var(--glass-border);
    }

    nav ul.active {
        display: flex;
    }

    nav ul li a {
        padding: 0.8rem 1.5rem;
        display: block;
    }

    .mobile-menu-toggle {
        display: block;
    }

    #hero {
        padding: 5rem 1rem 3rem;
    }

    section {
        padding: 3rem 1rem;
    }

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

    #services ul {
        grid-template-columns: 1fr;
    }

    #howto ol {
        flex-direction: column;
    }

    #articles ul {
        grid-template-columns: 1fr;
    }

    footer nav ul {
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .nav-brand {
        font-size: 1.3rem;
    }

    .cta-button {
        padding: 0.8rem 2rem;
        font-size: 1rem;
    }
}

/* ========== 暗色模式增强（默认已是暗色） ========== */
/* 无需额外媒体查询，所有颜色已适配暗色 */

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent2);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent1);
}