/* 基础样式重置 */
:root {
    /* 颜色变量 - 根据设计规范 */
    --primary: #0057bd;
    --secondary: #006576;
    --tertiary: #6a37d4;
    --surface: #f5f7f9;
    --surface-container-low: #eef1f3;
    --surface-container-lowest: #ffffff;
    --on-surface: #2c2f31;
    --on-surface-variant: #5f6366;
    --on-primary: #ffffff;
    --on-secondary-container: #ffffff;
    --primary-container: #6e9fff;
    --secondary-container: #65e1ff;
    --error: #b31b25;
    --error-container: #fb5151;

    /* 圆角 */
    --radius-sm: 0.5rem;
    --radius-lg: 2rem;
    --radius-xl: 3rem;
    --radius-full: 9999px;

    /* 间距 */
    --spacing-4: 1.4rem;
    --spacing-6: 2rem;
    --spacing-12: 4rem;

    /* 阴影 */
    --shadow-ambient: 0 10px 30px rgba(0, 87, 189, 0.08);
    --shadow-elevated: 0 20px 40px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    color: var(--on-surface);
    line-height: 1.6;
    overflow-x: hidden;
    background-color: var(--surface);
}

/* 导入Inter字体 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius-xl);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: var(--on-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-ambient);
}

.btn-outline {
    background-color: var(--surface-container-low);
    color: var(--on-surface);
}

.btn-outline:hover {
    background-color: var(--surface-container-lowest);
    transform: translateY(-2px);
    box-shadow: var(--shadow-ambient);
}

.btn-large {
    padding: 16px 40px;
    font-size: 18px;
    border-radius: var(--radius-xl);
}

.btn-login {
    color: var(--on-surface-variant);
    background: transparent;
    border: none;
}

.btn-login:hover {
    color: var(--primary);
    background: transparent;
    transform: none;
}

/* 导航栏 - 玻璃态效果 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(245, 247, 249, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    padding: 20px 0;
    box-shadow: var(--shadow-ambient);
}

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

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    font-size: 24px;
    font-weight: 700;
    color: var(--on-surface);
}

.logo-icon {
    font-size: 28px;
    margin-right: 8px;
}

.logo-highlight {
    color: var(--primary);
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--on-surface-variant);
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
    background-color: rgba(0, 87, 189, 0.08);
}

/* 移除底部边框线，使用背景变化 */
.nav-link.active::after {
    display: none;
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--on-surface);
    cursor: pointer;
    background: var(--surface-container-low);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
}

/* 英雄区域 */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, var(--surface-container-low) 0%, var(--surface) 100%);
}

.hero-container {
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--on-surface);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--on-surface-variant);
    margin-bottom: 30px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
}

.stat-text {
    font-size: 14px;
    color: var(--on-surface-variant);
    margin-top: 5px;
}

.hero-image {
    flex: 1;
}

.dashboard-mockup {
    background: var(--surface-container-lowest);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-elevated);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.5s ease, box-shadow 0.5s ease;
}

.dashboard-mockup:hover {
    transform: perspective(1000px) rotateY(0deg);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.1);
}

.mockup-header {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.mockup-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27ca40; }

.mockup-title {
    color: var(--on-primary);
    font-size: 14px;
    font-weight: 500;
}

.mockup-content {
    padding: 24px;
}

.chat-window {
    margin-bottom: 20px;
}

.chat-message {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.chat-message.incoming {
    flex-direction: row;
}

.chat-message.outgoing {
    flex-direction: row-reverse;
}

.chat-message.outgoing .message-content {
    align-items: flex-end;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--surface-container-low);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.message-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.message-sender {
    font-size: 12px;
    color: var(--on-surface-variant);
    margin-bottom: 4px;
}

.message-text {
    background: var(--surface-container-low);
    padding: 12px 16px;
    border-radius: 18px;
    max-width: 80%;
    font-size: 14px;
    color: var(--on-surface);
}

.chat-message.outgoing .message-text {
    background: linear-gradient(90deg, var(--tertiary), var(--primary));
    color: var(--on-primary);
}

.input-area {
    display: flex;
    gap: 10px;
}

.chat-input {
    flex: 1;
    padding: 14px 20px;
    border: none;
    background: var(--surface-container-low);
    border-radius: var(--radius-full);
    font-size: 14px;
    outline: none;
    transition: all 0.3s ease;
    color: var(--on-surface);
}

.chat-input:focus {
    background: var(--surface-container-lowest);
    box-shadow: 0 0 0 2px rgba(0, 87, 189, 0.2);
}

.send-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: var(--on-primary);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-ambient);
}

/* 功能区域 */
.features {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--on-surface);
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--on-surface-variant);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--surface-container-lowest);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-elevated);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    color: var(--on-primary);
    font-size: 28px;
}

.feature-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--on-surface);
}

.feature-desc {
    color: var(--on-surface-variant);
    line-height: 1.7;
    font-size: 16px;
}

/* 解决方案 */
.solutions {
    padding: 100px 0;
    background: var(--surface-container-low);
}

.solutions-tabs {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.tab {
    padding: 12px 28px;
    background: var(--surface-container-lowest);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    color: var(--on-surface-variant);
    border: none;
}

.tab:hover, .tab.active {
    background: linear-gradient(90deg, var(--secondary), var(--secondary-container));
    color: var(--on-secondary-container);
    transform: translateY(-2px);
    box-shadow: var(--shadow-ambient);
}

.solution-content {
    display: flex;
    align-items: center;
    gap: 60px;
    background: var(--surface-container-lowest);
    border-radius: var(--radius-xl);
    padding: 50px;
    box-shadow: var(--shadow-elevated);
}

.solution-image {
    flex: 1;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.solution-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
}

.solution-details {
    flex: 1;
}

.solution-details h3 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--on-surface);
    font-weight: 700;
}

.solution-details p {
    color: var(--on-surface-variant);
    margin-bottom: 25px;
    line-height: 1.7;
    font-size: 17px;
}

.solution-features {
    list-style: none;
    margin-bottom: 35px;
}

.solution-features li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--on-surface);
}

.solution-features i {
    color: var(--secondary);
    font-size: 18px;
}

/* 客户案例 */
.cases {
    padding: 100px 0;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.case-card {
    background: var(--surface-container-lowest);
    padding: 40px;
    border-radius: var(--radius-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-elevated);
}

.case-logo {
    font-size: 48px;
    margin-bottom: 25px;
}

.case-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--on-surface);
    font-weight: 600;
}

.case-card p {
    color: var(--on-surface-variant);
    margin-bottom: 25px;
    font-style: italic;
    line-height: 1.6;
    font-size: 16px;
}

.case-author {
    display: flex;
    align-items: center;
    gap: 15px;
    padding-top: 25px;
    /* 移除边框线，使用间距分隔 */
}

.author-avatar {
    width: 44px;
    height: 44px;
    background: linear-gradient(90deg, var(--tertiary), var(--primary));
    color: var(--on-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 18px;
}

.author-name {
    font-weight: 600;
    color: var(--on-surface);
}

.author-title {
    font-size: 14px;
    color: var(--on-surface-variant);
}

/* CTA区域 */
.cta {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--tertiary), var(--primary-container));
    color: var(--on-primary);
    text-align: center;
}

.cta-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-subtitle {
    font-size: 18px;
    margin-bottom: 50px;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

.cta-form {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.email-input {
    padding: 16px 24px;
    border-radius: var(--radius-full);
    border: none;
    background: rgba(255, 255, 255, 0.9);
    font-size: 16px;
    min-width: 320px;
    outline: none;
    color: var(--on-surface);
    transition: all 0.3s ease;
}

.email-input:focus {
    background: rgba(255, 255, 255, 1);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.cta-note {
    font-size: 14px;
    opacity: 0.8;
    margin-top: 20px;
}

/* 页脚 */
.footer {
    background: var(--on-surface);
    color: var(--surface);
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 50px;
    margin-bottom: 50px;
}

.footer-col h4 {
    font-size: 18px;
    margin-bottom: 25px;
    color: var(--surface);
    font-weight: 600;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 14px;
    display: flex;
    align-items: center;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-col i {
    margin-right: 12px;
    color: var(--secondary-container);
    width: 20px;
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    font-size: 26px;
    font-weight: 700;
    color: var(--surface);
    margin-bottom: 20px;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 25px;
    max-width: 250px;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--surface);
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--secondary);
    transform: translateY(-3px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links {
    display: flex;
    gap: 25px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--surface);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }

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

    .solution-content {
        flex-direction: column;
    }

    .hero-title {
        font-size: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--surface-container-lowest);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-elevated);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        gap: 16px;
    }

    .nav-menu.show {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
        background: var(--surface-container-low);
        width: 48px;
        height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: var(--radius-sm);
    }

    .nav-buttons {
        display: none;
    }

    .hero-title {
        font-size: 32px;
    }

    .section-title {
        font-size: 28px;
    }

    .cta-form {
        flex-direction: column;
        align-items: center;
    }

    .email-input {
        min-width: auto;
        width: 100%;
        max-width: 400px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn-large {
        width: 100%;
        text-align: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

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

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