/* 每日大赛 - 高端极简风格 CSS */
:root {
    --primary-color: #000000;
    --secondary-color: #ffffff;
    --accent-color: #333333;
    --text-color: #1a1a1a;
    --bg-color: #ffffff;
    --gray-light: #f9f9f9;
    --gray-medium: #e0e0e0;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--gray-medium);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    font-size: 16px;
    font-weight: 500;
    color: var(--accent-color);
}

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

/* Search Box */
.search-wrapper {
    padding: 10px 0;
    background: var(--gray-light);
    border-bottom: 1px solid var(--gray-medium);
    margin-top: 80px;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 12px 20px;
    border: 1px solid var(--gray-medium);
    border-radius: 30px;
    outline: none;
    font-size: 14px;
}

/* Hero Banner */
.hero {
    height: 80vh;
    background: url('../images/banner.jpg') no-repeat center center/cover;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--secondary-color);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 15px 40px;
    background: var(--secondary-color);
    color: var(--primary-color);
    font-weight: 600;
    border-radius: 4px;
    transition: var(--transition);
}

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

/* Section General */
section {
    padding: 100px 0;
}

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

.section-title h2 {
    font-size: 36px;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

/* Brand Intro */
.brand-intro {
    display: flex;
    align-items: center;
    gap: 60px;
}

.brand-intro-text {
    flex: 1;
}

.brand-intro-image {
    flex: 1;
}

/* Video Cards */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.video-card {
    background: var(--secondary-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: var(--transition);
    position: relative;
}

.video-card:hover {
    transform: translateY(-10px);
}

.video-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.play-btn {
    width: 60px;
    height: 60px;
    background: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-btn::after {
    content: '';
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent var(--primary-color);
    margin-left: 4px;
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: #666;
}

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

.faq-item {
    border-bottom: 1px solid var(--gray-medium);
    padding: 20px 0;
}

.faq-question {
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding-top: 15px;
    display: none;
    color: #555;
}

/* Testimonials */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    padding: 30px;
    background: var(--gray-light);
    border-radius: 8px;
}

.testimonial-text {
    font-style: italic;
    margin-bottom: 20px;
}

.testimonial-author {
    font-weight: 700;
    text-align: right;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--secondary-color);
    padding: 60px 0 30px;
}

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

.footer-links a {
    display: block;
    margin-bottom: 10px;
    opacity: 0.7;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #333;
    font-size: 14px;
    opacity: 0.6;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero h1 {
        font-size: 32px;
    }
    .brand-intro {
        flex-direction: column;
    }
    .video-grid {
        grid-template-columns: 1fr;
    }
}