/* --- 变量定义：抹茶绿与毛玻璃 --- */
:root {
    --matcha-main: #9fb46c;         /* 标准抹茶绿 */
    --matcha-dark: #2d3e10;         /* 深色文字/按钮 */
    --matcha-bg: #f2f5eb;           /* 极浅抹茶背景 */
    --glass-white: rgba(255, 255, 255, 0.45); 
    --glass-border: rgba(255, 255, 255, 0.25);
    --apple-font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
}

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

body, html {
    font-family: var(--apple-font);
    background-color: var(--matcha-bg);
    color: #333;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* --- 导航栏：Apple 居中布局 --- */
nav {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 95%;
    max-width: 1200px;
    height: 64px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    z-index: 9999; /* 确保在最顶层 */
    background: var(--glass-white);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: 22px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
}

.nav-left, .nav-right {
    flex: 1;
    display: flex;
}

.nav-right { justify-content: flex-end; }

.nav-center {
    flex: 2;
    text-align: center;
}

.company-name {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--matcha-dark);
    text-transform: uppercase;
}

/* --- 毛玻璃按钮 --- */
.btn-glass {
    background: rgba(159, 180, 108, 0.12);
    border: 1px solid var(--glass-border);
    padding: 8px 16px;
    border-radius: 12px;
    color: var(--matcha-dark);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-glass:hover {
    background: rgba(159, 180, 108, 0.25);
    transform: translateY(-2px);
}

/* --- 全屏无缝轮播 --- */
.hero-carousel {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background: #000;
}

.carousel-inner {
    display: flex;
    width: 400%; /* 3图 + 1副本 */
    height: 100%;
    animation: seamlessLoop 15s infinite cubic-bezier(0.65, 0, 0.35, 1);
}

.carousel-item {
    width: 100vw;
    height: 100%;
    background-size: cover;
    background-position: center;
}

@keyframes seamlessLoop {
    0%, 20%   { transform: translateX(0); }
    25%, 45%  { transform: translateX(-100vw); }
    50%, 70%  { transform: translateX(-200vw); }
    75%, 95%  { transform: translateX(-300vw); }
    100%      { transform: translateX(-300vw); }
}

/* --- 视频区域 --- */
.content-section {
    padding: 100px 20px;
    max-width: 1300px;
    margin: 0 auto;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
}

.video-card {
    background: var(--glass-white);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    padding: 20px;
    transition: 0.5s;
    position: relative;
}

.video-card:hover {
    transform: translateY(-12px);
    background: rgba(255, 255, 255, 0.6);
}

.video-title {
    color: var(--matcha-dark);
    margin-bottom: 15px;
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
}

/* 核心修改：确保视频可点击 */
.video-wrapper {
    position: relative;
    width: 100%;
    border-radius: 20px;
    overflow: hidden;
    background: #000;
}

video {
    width: 100%;
    display: block;
    cursor: pointer;
    z-index: 10;
}

/* --- 消息提示 (Toast) --- */
.toast {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--matcha-dark);
    color: #fff;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
    display: none;
    z-index: 10000;
}