/* ==========================================
   TeamSeeking - 清新简洁风格样式
   ========================================== */

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

:root {
    /* 主色调 - 清新蓝绿色 */
    --primary-color: #0ea5e9;
    --primary-dark: #0284c7;
    --primary-light: #e0f2fe;

    /* 辅助色 */
    --accent-color: #10b981;
    --accent-light: #d1fae5;

    /* 中性色 */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e5e7eb;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* 过渡 */
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* ==========================================
   导航栏
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-sm);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
}

.logo {
    height: 40px;
    width: auto;
    border-radius: var(--radius-md);
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

.nav-cta-btn {
    background-color: var(--primary-color) !important;
    color: white !important;
    padding: 0.5rem 1.25rem !important;
    border-radius: var(--radius-md) !important;
    transition: var(--transition);
}

.nav-cta-btn:hover {
    background-color: var(--primary-dark) !important;
    box-shadow: var(--shadow-md);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* ==========================================
   Hero 区域（首页）
   ========================================== */
.hero {
    padding: calc(80px + var(--spacing-lg)) 0 var(--spacing-xl);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--primary-light) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero .container {
    display: flex;
    justify-content: center;
}

.hero-content {
    max-width: 900px;
    width: 100%;
    animation: fadeInUp 0.8s ease;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 特性卡片 */
.hero-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.hero-feature-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    background: white;
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    text-align: left;
}

.hero-feature-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.hero-feature-icon {
    font-size: 1.5rem;
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light) 0%, white 100%);
    border-radius: var(--radius-md);
}

.hero-feature-text h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.hero-feature-text p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

/* ==========================================
   通用样式
   ========================================== */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.125rem;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ==========================================
   使用场景
   ========================================== */
.scenarios {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-secondary);
}

.scenario-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.scenario-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.scenario-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-light) 0%, white 100%);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.scenario-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.scenario-content p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0;
}

.scenario-card:hover {
    box-shadow: var(--shadow-xl);
}

/* 聊天演示界面 */
.chat-demo {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chat-header {
    background: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    color: var(--text-primary);
}

.chat-messages {
    padding: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
}

.message {
    display: flex;
    gap: var(--spacing-xs);
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.message-body {
    display: flex;
    flex-direction: column;
    max-width: 70%;
}

.message.user .message-body {
    align-items: flex-end;
}

.message-name {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: 2px;
}

.message.user .message-name {
    display: none;
}

.message-content {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
    line-height: 1.5;
    word-wrap: break-word;
}

.message.user .message-content {
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-md) 0 var(--radius-md) var(--radius-md);
}

.message.assistant .message-content {
    background: white;
    color: var(--text-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* ==========================================
   演示区域
   ========================================== */
.demo {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-primary);
}

.demo-content {
    max-width: 800px;
    margin: 0 auto;
}

.demo-placeholder {
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: 2px dashed var(--border-color);
}

.demo-icon {
    font-size: 4rem;
}

.demo-placeholder p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* ==========================================
   CTA 区域
   ========================================== */
.cta {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.cta p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

.cta-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

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

.cta .btn-secondary {
    background-color: transparent;
    color: white;
    border-color: white;
}

.cta .btn-primary:hover {
    box-shadow: var(--shadow-xl);
}

.cta .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ==========================================
   页脚
   ========================================== */
.footer {
    padding: var(--spacing-lg) 0 var(--spacing-md);
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    height: 40px;
    margin-bottom: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.footer-brand h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.footer-brand p {
    color: var(--text-secondary);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

/* ==========================================
   动画
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================
   模态弹窗
   ========================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    max-width: 400px;
    width: 90%;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    font-size: 1.5rem;
    color: var(--text-light);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    text-align: center;
    padding: var(--spacing-sm) 0;
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.modal-body h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.contact-email {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.contact-email:hover {
    background-color: var(--primary-light);
}

.contact-tip {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 992px) {
    .hero-features {
        grid-template-columns: 1fr;
    }

    .scenario-info {
        flex-wrap: wrap;
    }

    .scenario-content {
        flex: 1;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: var(--spacing-sm);
        border-top: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
    }

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

    .nav-toggle {
        display: flex;
    }

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

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

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

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

    .section-title {
        font-size: 1.75rem;
    }

    .cta h2 {
        font-size: 1.75rem;
    }

    .cta-actions {
        flex-direction: column;
    }

    .scenario-info {
        flex-direction: column;
        text-align: center;
    }

    .chat-messages {
        max-height: 250px;
    }
}