/* 每日大赛品牌咨询官网 - 全局样式表 */

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

:root {
    --primary-color: #1e3a8a;
    --secondary-color: #0ea5e9;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

/* 通用样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 50px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 40px;
}

/* 头部导航 */
header {
    background-color: var(--bg-white);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 40px;
    width: auto;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

nav a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--secondary-color);
}

.search-box {
    display: flex;
    align-items: center;
    background-color: var(--bg-light);
    border-radius: 20px;
    padding: 8px 15px;
    gap: 10px;
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    width: 150px;
    font-size: 0.9rem;
}

.search-box button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
}

.cta-button {
    background-color: var(--secondary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    background-color: var(--primary-color);
}

/* Banner首屏 */
.banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 100px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="white" stroke-width="0.5" opacity="0.1"/></pattern></defs><rect width="1200" height="600" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

.banner-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.banner h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.banner p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

.banner-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    padding: 15px 40px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    padding: 15px 40px;
    border: 2px solid white;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    font-size: 1rem;
}

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

/* 服务模块 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.service-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
    border-color: var(--secondary-color);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.service-card p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.6;
}

.service-card .btn-primary {
    display: inline-block;
    padding: 10px 25px;
    font-size: 0.9rem;
}

/* 专家模块 */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.expert-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.expert-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.expert-avatar {
    width: 100%;
    height: 250px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
}

.expert-info {
    padding: 20px;
}

.expert-info h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.expert-info .title {
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.expert-info .experience {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 15px;
}

.expert-info p {
    color: var(--text-light);
    font-size: 0.85rem;
    line-height: 1.5;
    margin-bottom: 15px;
}

.expert-contact {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.expert-contact .btn-primary {
    flex: 1;
    padding: 8px 15px;
    font-size: 0.8rem;
}

/* 流程模块 */
.process-timeline {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.process-step {
    flex: 1;
    min-width: 150px;
    text-align: center;
    position: relative;
}

.process-step::after {
    content: '→';
    position: absolute;
    right: -30px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2rem;
    color: var(--secondary-color);
}

.process-step:last-child::after {
    content: '';
}

.process-number {
    width: 50px;
    height: 50px;
    background-color: var(--secondary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.5rem;
    margin: 0 auto 15px;
}

.process-step h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.process-step p {
    color: var(--text-light);
    font-size: 0.9rem;
}

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

.case-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.case-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.case-cover {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.case-content {
    padding: 20px;
}

.case-category {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 10px;
}

.case-content h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.case-content p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 10px;
}

.case-result {
    background-color: var(--bg-light);
    padding: 10px;
    border-radius: 5px;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

/* 文章模块 */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.article-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.article-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.article-category {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    margin-bottom: 10px;
    width: fit-content;
}

.article-header h3 {
    font-size: 1.1rem;
    line-height: 1.4;
}

.article-body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.article-excerpt {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 15px;
    flex: 1;
}

.article-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.article-tag {
    background-color: var(--bg-light);
    color: var(--text-dark);
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.75rem;
}

.article-video-tag {
    background-color: var(--danger-color);
    color: white;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 600;
}

.article-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.article-footer a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

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

/* 评价模块 */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.review-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 25px;
    transition: all 0.3s ease;
}

.review-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--secondary-color);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 15px;
}

.review-user {
    flex: 1;
}

.review-user h4 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.review-user .identity {
    color: var(--text-light);
    font-size: 0.85rem;
}

.review-rating {
    color: var(--accent-color);
    font-size: 1.2rem;
    letter-spacing: 2px;
}

.review-content {
    color: var(--text-dark);
    line-height: 1.6;
    margin-bottom: 15px;
    font-style: italic;
}

.review-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-light);
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.review-recommend {
    background-color: var(--success-color);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
}

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

.faq-item {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    margin-bottom: 20px;
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    background-color: var(--bg-light);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.faq-question:hover {
    background-color: var(--secondary-color);
    color: white;
}

.faq-toggle {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 20px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 联系模块 */
.contact-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 80px 20px;
}

.contact-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.contact-info h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
}

.contact-item {
    margin-bottom: 25px;
    display: flex;
    gap: 15px;
}

.contact-icon {
    font-size: 1.5rem;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-item h4 {
    margin-bottom: 5px;
}

.contact-item p {
    opacity: 0.9;
}

.contact-form {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    backdrop-filter: blur(10px);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 5px;
    font-family: inherit;
    font-size: 1rem;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group button {
    width: 100%;
    padding: 12px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.form-group button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* 页脚 */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: 50px 20px 20px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 20px;
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.footer-logo img {
    height: 30px;
    width: auto;
}

/* 视频卡片 */
.video-card {
    position: relative;
    overflow: hidden;
    border-radius: 10px;
    background-color: var(--bg-light);
    cursor: pointer;
    transition: all 0.3s ease;
}

.video-card:hover {
    transform: scale(1.05);
}

.video-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    position: relative;
}

.video-play-button {
    position: absolute;
    width: 60px;
    height: 60px;
    background-color: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    opacity: 0;
    transition: all 0.3s ease;
}

.video-card:hover .video-play-button {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .banner h1 {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    nav ul {
        gap: 15px;
    }

    .search-box {
        display: none;
    }

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

    .contact-content {
        grid-template-columns: 1fr;
    }

    .process-timeline {
        flex-direction: column;
    }

    .process-step::after {
        content: '↓';
        right: auto;
        bottom: -30px;
    }

    .process-step:last-child::after {
        content: '';
    }

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

@media (max-width: 480px) {
    .banner {
        padding: 50px 15px;
    }

    .banner h1 {
        font-size: 1.5rem;
    }

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

    .section {
        padding: 40px 0;
    }

    .section-title {
        font-size: 1.5rem;
    }

    nav ul {
        gap: 10px;
        font-size: 0.9rem;
    }

    .services-grid,
    .experts-grid,
    .cases-grid,
    .articles-grid,
    .reviews-grid {
        grid-template-columns: 1fr;
    }
}

/* 关键词密度优化 - 自然分布 */
.brand-keyword {
    /* 用于标记品牌关键词，但不改变样式 */
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}