/* ===== 基础样式 ===== */
:root {
    --primary: #6C5CE7;
    --primary-dark: #5A4BD1;
    --primary-light: #A29BFE;
    --accent: #00C9A7;
    --accent-light: #E0FFF8;
    --dark: #1A1A2E;
    --dark-light: #2D2D44;
    --text: #2D3436;
    --text-light: #636E72;
    --text-lighter: #B2BEC3;
    --bg: #FAFBFC;
    --bg-card: #FFFFFF;
    --bg-section: #F5F6FA;
    --border: #E8ECF0;
    --gradient-1: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);
    --gradient-2: linear-gradient(135deg, #00C9A7 0%, #6C5CE7 100%);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    overflow-x: hidden;
}

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

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    padding: 10px 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    transition: color var(--transition);
}

.navbar.scrolled .logo-text { color: var(--dark); }

.logo-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--gradient-2);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    display: block;
    padding: 8px 18px;
    text-decoration: none;
    color: rgba(255,255,255,0.85);
    font-size: 0.92rem;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
}

.navbar.scrolled .nav-link { color: var(--text); }

.nav-link:hover {
    background: rgba(255,255,255,0.15);
}

.navbar.scrolled .nav-link:hover {
    background: var(--bg-section);
    color: var(--primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: var(--transition);
}

.navbar.scrolled .nav-toggle span { background: var(--dark); }

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(160deg, #1A1A2E 0%, #2D1B69 40%, #1A1A2E 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    inset: 0;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 100px 0 80px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 24px;
    background: rgba(108,92,231,0.2);
    border: 1px solid rgba(108,92,231,0.4);
    border-radius: 50px;
    color: var(--primary-light);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 32px;
    letter-spacing: 1px;
}

.hero-title {
    font-size: 3.6rem;
    font-weight: 900;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.text-gradient {
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 64px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
    box-shadow: 0 4px 20px rgba(108,92,231,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(108,92,231,0.5);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.5);
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 900;
    color: #fff;
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
    font-weight: 400;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.5);
    font-size: 0.8rem;
    animation: bounce 2s ease infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-8px); }
}

/* ===== 通用 Section ===== */
.section {
    padding: 100px 0;
}

.section:nth-child(even) {
    background: var(--bg-section);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 18px;
    background: var(--accent-light);
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 50px;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.section-title {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ===== 关于我们 ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.about-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 36px 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.5s ease;
}

.about-card:hover::before {
    transform: scaleX(1);
}

.about-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.about-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.about-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.about-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== 核心业务 ===== */
.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 24px;
}

.business-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 36px 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.business-card.featured {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 1px var(--primary-light);
}

.business-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.business-number {
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 3rem;
    font-weight: 900;
    color: rgba(108,92,231,0.08);
    line-height: 1;
}

.business-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.business-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.business-subtitle {
    font-size: 0.85rem;
    color: var(--text-lighter);
    margin-bottom: 12px;
    font-weight: 500;
}

.business-desc {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.7;
}

.business-features {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.business-features li {
    background: var(--bg-section);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.82rem;
    color: var(--primary);
    font-weight: 500;
}

/* ===== 解决方案 Tabs ===== */
.solutions-tabs {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.tab-nav {
    display: flex;
    border-bottom: 1px solid var(--border);
    background: var(--bg-section);
    overflow-x: auto;
}

.tab-btn {
    padding: 16px 28px;
    border: none;
    background: none;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    font-family: inherit;
    position: relative;
}

.tab-btn.active {
    color: var(--primary);
    background: var(--bg-card);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
}

.tab-btn:hover { color: var(--primary); }

.tab-content {
    display: none;
    padding: 36px;
}

.tab-content.active { display: block; }

.tab-inner {
    display: flex;
    gap: 48px;
    align-items: center;
    flex-wrap: wrap;
}

.tab-text {
    flex: 1;
    min-width: 280px;
}

.tab-text h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.tab-text p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.7;
}

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

.tab-text ul li {
    padding-left: 24px;
    position: relative;
    color: var(--text);
    font-size: 0.95rem;
    line-height: 1.6;
}

.tab-text ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

.tab-visual {
    flex-shrink: 0;
}

.visual-card {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: var(--gradient-1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 8px 32px rgba(108,92,231,0.3);
}

.visual-icon { font-size: 2.5rem; margin-bottom: 4px; }
.visual-number { font-size: 1.5rem; font-weight: 900; }
.visual-label { font-size: 0.8rem; opacity: 0.9; }

/* ===== 团队 ===== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.team-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 40px 32px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.team-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.team-avatar {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100px;
    height: 100px;
    margin-left: auto;
    margin-right: auto;
    border-radius: 50%;
    overflow: hidden;
    background: var(--bg-section);
}

.team-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.avatar-placeholder {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 4px 16px rgba(108,92,231,0.3);
}

.team-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.team-role {
    display: inline-block;
    padding: 4px 16px;
    background: var(--accent-light);
    color: var(--accent);
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.team-bio {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.7;
    text-align: left;
}

/* ===== 案例成果 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.case-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.case-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.case-tag {
    display: inline-block;
    padding: 4px 14px;
    background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(0,201,167,0.1));
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.case-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    line-height: 1.4;
}

.case-card p {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 20px;
}

.case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.case-meta span {
    background: var(--bg-section);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ===== 为什么选择我们 ===== */
.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.why-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
}

.why-item:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.why-number {
    font-size: 2.5rem;
    font-weight: 900;
    color: rgba(108,92,231,0.1);
    position: absolute;
    top: 16px;
    right: 24px;
    line-height: 1;
}

.why-item h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}

.why-item p {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.contact-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.contact-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
    border-color: var(--primary-light);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    display: block;
}

.contact-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

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

/* ===== 页脚 ===== */
.footer {
    background: var(--dark);
    padding: 64px 0 32px;
    color: rgba(255,255,255,0.7);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}

.footer-brand p {
    color: rgba(255,255,255,0.5);
    font-size: 0.92rem;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

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

.footer-col ul li {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
    cursor: default;
}

.footer-col ul li:hover {
    color: rgba(255,255,255,0.8);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .hero-title { font-size: 2.2rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .hero-stats { gap: 24px; }
    .stat-number { font-size: 1.5rem; }

    .section { padding: 64px 0; }
    .section-title { font-size: 1.7rem; }
    .section-header { margin-bottom: 40px; }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 300px;
        height: 100vh;
        background: var(--bg-card);
        flex-direction: column;
        padding: 80px 24px 24px;
        gap: 4px;
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
    }

    .nav-menu.active { right: 0; }

    .nav-menu .nav-link {
        color: var(--text);
        padding: 14px 16px;
        font-size: 1rem;
    }

    .nav-toggle { display: flex; }

    .tab-nav { overflow-x: auto; }
    .tab-btn { font-size: 0.85rem; }

    .footer-content { flex-direction: column; }
    .footer-links { gap: 32px; }
}

/* ===== 粒子动画 ===== */
.particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.15);
    animation: float 8s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.3; }
    50% { transform: translateY(-40px) scale(1.5); opacity: 0.6; }
}