/* 每日大赛 品牌官网 全局样式 */
:root {
    --primary-color: #d4af37; /* 金色 */
    --secondary-color: #001f3f; /* 深蓝色 */
    --text-color: #333;
    --bg-color: #f4f4f4;
    --white: #ffffff;
}

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

body {
    font-family: "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* Header */
header {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 10px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 50px;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a:hover {
    color: var(--primary-color);
}

/* Search Bar */
.search-container {
    margin-top: 10px;
    text-align: center;
}

.search-container input {
    width: 60%;
    padding: 8px;
    border-radius: 20px;
    border: none;
}

/* Hero Section */
.hero {
    background: url('../assets/images/hero_banner.jpg') no-content center/cover;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
}

/* Sections */
section {
    padding: 40px 0;
}

h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--secondary-color);
    position: relative;
}

h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: var(--primary-color);
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

/* Video Cards */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.video-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    position: relative;
    transition: transform 0.3s;
}

.video-card:hover {
    transform: translateY(-5px);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    background: #000;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: var(--white);
    opacity: 0;
    transition: opacity 0.3s;
}

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

.video-info {
    padding: 15px;
}

.video-info h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: #777;
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 40px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.footer-bottom {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .header-top { flex-direction: column; }
    nav ul { margin-top: 10px; }
    .search-container input { width: 90%; }
}