/* =============================================
   国际人app — 设计系统
   风格：暖橙现代主义 · 乐观国际风
   配色：火焰橙 + 薄荷绿 + 金盏黄
   背景：暖白基调
   ============================================= */

/* 基础重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    overflow-x: hidden;
    background: #FCF9F7;
    color: #2D3436;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* 核心布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
    position: relative;
}

.section:nth-child(even) {
    background: #FFF5F0;
}

/* 导航 — 固定顶部 */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(252, 249, 247, 0.92);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid rgba(255, 107, 53, 0.10);
    transition: box-shadow 0.3s ease;
}

.site-header:hover {
    box-shadow: 0 2px 32px rgba(255, 107, 53, 0.06);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.3rem;
    text-decoration: none;
    color: #2D3436;
    letter-spacing: -0.3px;
    transition: opacity 0.2s;
}

.logo:hover {
    opacity: 0.85;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background: linear-gradient(135deg, #FF6B35, #FF8F65);
    color: #fff;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.25);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.logo:hover .logo-icon {
    transform: scale(1.05) rotate(-2deg);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.35);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.main-nav a {
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    color: #636e72;
    transition: color 0.2s ease, transform 0.2s ease;
    position: relative;
    padding: 4px 0;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #FF6B35, #FFD166);
    transition: width 0.3s ease;
    border-radius: 2px;
}

.main-nav a:hover {
    color: #FF6B35;
    transform: translateY(-1px);
}

.main-nav a:hover::after {
    width: 100%;
}

.nav-cta {
    padding: 10px 24px !important;
    border-radius: 50px !important;
    color: #fff !important;
    font-weight: 700 !important;
    background: linear-gradient(135deg, #FF6B35, #FF8F65) !important;
    box-shadow: 0 4px 14px rgba(255, 107, 53, 0.30);
    transition: transform 0.2s ease, box-shadow 0.2s ease !important;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 8px 24px rgba(255, 107, 53, 0.40) !important;
    color: #fff !important;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #2D3436;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background 0.2s;
}

.menu-toggle:hover {
    background: rgba(255, 107, 53, 0.08);
}

/* 首页Hero */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(160deg, #FCF9F7 0%, #FFF0E5 50%, #FCF9F7 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -5%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(78, 205, 196, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 720px;
    position: relative;
    z-index: 1;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 6px 18px;
    border-radius: 50px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.10), rgba(255, 209, 102, 0.15));
    color: #FF6B35;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    border: 1px solid rgba(255, 107, 53, 0.12);
}

.hero h1 {
    font-size: 3.4rem;
    line-height: 1.15;
    margin-bottom: 20px;
    font-weight: 800;
    color: #2D3436;
    letter-spacing: -0.5px;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, #FF6B35, #FFD166);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    opacity: 0.7;
    max-width: 560px;
    margin-bottom: 36px;
    color: #636e72;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-image {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(255, 107, 53, 0.10);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.hero-image:hover {
    transform: scale(1.01);
    box-shadow: 0 28px 80px rgba(255, 107, 53, 0.15);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all 0.25s ease;
    letter-spacing: 0.2px;
}

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, #FF6B35, #FF8F65);
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.30);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 32px rgba(255, 107, 53, 0.40);
}

.btn-outline {
    background: transparent;
    border: 2px solid #FF6B35;
    color: #FF6B35;
}

.btn-outline:hover {
    background: rgba(255, 107, 53, 0.06);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(255, 107, 53, 0.12);
}

/* 标签/标题 */
.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 14px;
    color: #FF6B35;
    background: rgba(255, 107, 53, 0.08);
    padding: 4px 16px;
    border-radius: 50px;
}

.section-title {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 16px;
    color: #2D3436;
    letter-spacing: -0.3px;
    line-height: 1.2;
}

.section-desc {
    max-width: 600px;
    opacity: 0.7;
    margin-bottom: 48px;
    color: #636e72;
    font-size: 1.05rem;
    line-height: 1.7;
}

/* 卡片网格 */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}

.category-card {
    border-radius: 20px;
    padding: 32px 28px;
    background: #fff;
    border: 1px solid rgba(255, 107, 53, 0.08);
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #FF6B35, #4ECDC4);
    opacity: 0;
    transition: opacity 0.35s ease;
}

.category-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(255, 107, 53, 0.08);
    border-color: rgba(255, 107, 53, 0.15);
}

.category-card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.5rem;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.10), rgba(78, 205, 196, 0.10));
    color: #FF6B35;
    transition: transform 0.3s ease, background 0.3s ease;
}

.category-card:hover .card-icon {
    transform: scale(1.08) rotate(-2deg);
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.15), rgba(78, 205, 196, 0.15));
}

.category-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: #2D3436;
}

.category-card p {
    font-size: 0.9rem;
    color: #636e72;
    line-height: 1.6;
    margin-bottom: 16px;
    opacity: 0.8;
}

.card-link {
    font-weight: 700;
    font-size: 0.85rem;
    text-decoration: none;
    color: #FF6B35;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s ease;
}

.card-link:hover {
    gap: 12px;
}

/* 特性块 */
.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.feature-image {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.04);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    border: 1px solid rgba(255, 107, 53, 0.06);
}

.feature-image:hover {
    transform: scale(1.01);
    box-shadow: 0 20px 60px rgba(255, 107, 53, 0.08);
}

.feature-image img {
    width: 100%;
    height: auto;
    display: block;
}

.feature-text h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: #2D3436;
}

.feature-text p {
    color: #636e72;
    line-height: 1.7;
    margin-bottom: 20px;
    opacity: 0.8;
}

.feature-list {
    list-style: none;
    margin-top: 8px;
}

.feature-list li {
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    color: #2D3436;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: '✦';
    font-weight: 700;
    color: #4ECDC4;
    font-size: 1rem;
}

/* 数据条 */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 32px 20px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid rgba(255, 107, 53, 0.06);
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.stat-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20%;
    width: 60%;
    height: 3px;
    background: linear-gradient(90deg, #FF6B35, #4ECDC4);
    border-radius: 3px;
    opacity: 0;
    transition: opacity 0.35s ease;
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 36px rgba(255, 107, 53, 0.06);
}

.stat-item:hover::after {
    opacity: 1;
}

.stat-number {
    font-size: 2.6rem;
    font-weight: 800;
    background: linear-gradient(135deg, #FF6B35, #FF8F65);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.6;
    margin-top: 8px;
    color: #636e72;
    font-weight: 500;
}

/* 内容墙 */
.content-wall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 28px;
}

.content-wall-item {
    border-radius: 20px;
    overflow: hidden;
    background: #fff;
    border: 1px solid rgba(255, 107, 53, 0.06);
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.content-wall-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(255, 107, 53, 0.08);
    border-color: rgba(255, 107, 53, 0.12);
}

.content-wall-item img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.content-wall-item:hover img {
    transform: scale(1.03);
}

.content-wall-body {
    padding: 24px 24px 28px;
}

.content-wall-body h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: #2D3436;
}

.content-wall-body p {
    font-size: 0.9rem;
    color: #636e72;
    line-height: 1.6;
    opacity: 0.8;
}

.content-wall-body .card-link {
    margin-top: 12px;
}

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

.faq-item {
    border: 1px solid rgba(255, 107, 53, 0.08);
    border-radius: 16px;
    margin-bottom: 10px;
    overflow: hidden;
    cursor: pointer;
    background: #fff;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item:hover {
    border-color: rgba(255, 107, 53, 0.18);
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.04);
}

.faq-item .faq-question {
    padding: 20px 24px;
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #2D3436;
    transition: color 0.3s ease;
}

.faq-item .faq-question::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 300;
    color: #FF6B35;
    transition: transform 0.4s ease;
}

.faq-item.open .faq-question::after {
    transform: rotate(45deg);
}

.faq-item .faq-answer {
    padding: 0 24px 20px;
    display: none;
    opacity: 0.7;
    color: #636e72;
    line-height: 1.7;
    font-size: 0.95rem;
}

.faq-item.open .faq-answer {
    display: block;
    animation: fadeSlideDown 0.35s ease;
}

@keyframes fadeSlideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 0.7;
        transform: translateY(0);
    }
}

/* CTA横幅 */
.cta-banner {
    padding: 72px 40px;
    text-align: center;
    border-radius: 24px;
    color: #fff;
    background: linear-gradient(135deg, #FF6B35 0%, #FF8F65 50%, #4ECDC4 100%);
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(255, 107, 53, 0.20);
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    pointer-events: none;
}

.cta-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.04);
    pointer-events: none;
}

.cta-banner h2 {
    color: #fff;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.cta-banner p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 28px;
    font-size: 1.05rem;
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary {
    background: #fff;
    color: #FF6B35;
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.30);
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 36px rgba(255, 255, 255, 0.40);
}

/* 页脚 */
.site-footer {
    padding: 64px 0 32px;
    background: #2D3436;
    color: rgba(255, 255, 255, 0.85);
}

.site-footer .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-brand .logo {
    color: #fff;
    font-size: 1.2rem;
}

.footer-brand .logo-icon {
    background: linear-gradient(135deg, #FF6B35, #FFD166);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.20);
}

.footer-brand p {
    font-size: 0.9rem;
    opacity: 0.6;
    line-height: 1.7;
    max-width: 280px;
}

.footer-col h5 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
    color: #FFD166;
    opacity: 0.9;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col ul a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-col ul a:hover {
    color: #FF6B35;
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 48px;
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom span {
    color: #FF6B35;
}

/* 工具类 */
.text-accent {
    color: #FF6B35;
}

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

.seo-description {
    max-width: 600px;
    margin: 0 auto 48px;
    opacity: 0.7;
    color: #636e72;
    line-height: 1.7;
}

.mt-0 {
    margin-top: 0;
}

.mb-0 {
    margin-bottom: 0;
}

/* 装饰性波浪分隔线 */
.section-divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #FF6B35, #4ECDC4);
    border-radius: 4px;
    margin: 0 auto 24px;
}

/* 浮动装饰元素 */
.float-decoration {
    position: absolute;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    opacity: 0.04;
    pointer-events: none;
    z-index: 0;
}

.float-decoration--orange {
    background: #FF6B35;
    top: 10%;
    right: 5%;
}

.float-decoration--green {
    background: #4ECDC4;
    bottom: 15%;
    left: 3%;
}

.float-decoration--yellow {
    background: #FFD166;
    top: 50%;
    right: 8%;
    width: 80px;
    height: 80px;
}

/* 响应式 */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.8rem;
    }
    .section-title {
        font-size: 2rem;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 72px 0;
    }

    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .feature-block {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(252, 249, 247, 0.98);
        backdrop-filter: blur(20px);
        padding: 24px 32px;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        border-bottom: 1px solid rgba(255, 107, 53, 0.08);
        box-shadow: 0 16px 48px rgba(0, 0, 0, 0.06);
    }

    .main-nav.open {
        display: flex;
    }

    .main-nav a {
        font-size: 1rem;
        padding: 8px 0;
    }

    .main-nav a::after {
        display: none;
    }

    .nav-cta {
        width: 100%;
        text-align: center;
        padding: 12px 24px !important;
    }

    .menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
    }

    .section-title {
        font-size: 1.7rem;
    }

    .cards-grid,
    .content-wall {
        grid-template-columns: 1fr;
    }

    .cta-banner {
        padding: 48px 24px;
    }

    .cta-banner h2 {
        font-size: 1.5rem;
    }

    .faq-item .faq-question {
        font-size: 0.95rem;
        padding: 16px 20px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .stats-bar {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .stat-item {
        padding: 20px 16px;
    }

    .stat-number {
        font-size: 1.6rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .cards-grid,
    .content-wall,
    .stats-bar {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .feature-block {
        gap: 24px;
    }

    .content-wall-item img {
        height: 180px;
    }

    .cta-banner {
        padding: 36px 20px;
        border-radius: 16px;
    }
}

/* 打印样式 */
@media print {
    .site-header {
        position: relative;
        background: #fff;
        border-bottom: 1px solid #eee;
    }

    .hero {
        min-height: auto;
        padding: 40px 0;
    }

    .category-card:hover,
    .content-wall-item:hover,
    .stat-item:hover {
        transform: none;
        box-shadow: none;
    }

    .btn {
        box-shadow: none;
    }
}