/* ================= CSS 变量 ================= */
:root {
    --bg-darkest: #111111;
    --bg-dark: #16171b;
    --accent-gold: #d9ac6b;
    --accent-gold-darker: #c89f5c;
    --text-light: #f0f0f0;
    --text-medium: #cccccc;
    --border-color: #2a2c30;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --shadow-color-light: rgba(217, 172, 107, 0.1);
}

/* 基础重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--bg-darkest);
    color: var(--text-light);
    line-height: 1.7;
    overflow-x: hidden;
}

.container { width: 90%; max-width: 1200px; margin: 0 auto; }

/* ================= 头部导航 ================= */
header {
    background-color: rgba(22, 23, 27, 0.95);
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px var(--shadow-color);
}
header .container { display: flex; justify-content: space-between; align-items: center; }

.logo img { height: 45px; filter: drop-shadow(0 0 5px var(--accent-gold)); }

/* 导航链接 */
nav a {
    color: var(--text-light); text-decoration: none; margin-left: 25px;
    font-weight: 500; transition: color 0.3s;
}
nav a:hover { color: var(--accent-gold); }

/* 移动端汉堡按钮 */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 10px; }
.hamburger { display: block; width: 25px; height: 3px; background: var(--text-light); position: relative; }
.hamburger::before, .hamburger::after {
    content: ''; position: absolute; left: 0; width: 100%; height: 3px; background: var(--text-light); transition: 0.3s;
}
.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

/* ================= Banner 区域 ================= */
#banner {
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.7)), url('../photo/banner1-zh.webp') no-repeat center center/cover;
    min-height: 100vh;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    text-align: center; padding-top: 80px;
}
#banner h1 {
    font-size: 4rem; color: var(--accent-gold); margin-bottom: 1rem;
    text-shadow: 2px 2px 6px rgba(0,0,0,0.7);
}
#banner p { font-size: 1.5rem; margin-bottom: 2.5rem; font-weight: 300; }

.btn {
    display: inline-block; padding: 12px 30px; border-radius: 8px;
    text-decoration: none; font-weight: 500; transition: 0.3s; margin: 0 10px; cursor: pointer;
}
.btn-primary { background: var(--accent-gold); color: var(--bg-dark); }
.btn-primary:hover { background: var(--accent-gold-darker); transform: translateY(-3px); }

.btn-secondary { background: transparent; border: 2px solid var(--accent-gold); color: var(--accent-gold); }
.btn-secondary:hover { background: var(--accent-gold); color: var(--bg-dark); transform: translateY(-3px); }

/* ================= 通用区块 ================= */
.content-section { padding: 90px 0; background: var(--bg-darkest); }
.content-section:nth-child(even) { background: var(--bg-dark); }

h2 {
    text-align: center; font-size: 2.5rem; color: var(--accent-gold);
    margin-bottom: 60px; position: relative;
}
h2::after {
    content: ''; position: absolute; bottom: -15px; left: 50%; transform: translateX(-50%);
    width: 80px; height: 3px; background: var(--accent-gold);
}

#intro p { max-width: 800px; margin: 0 auto; text-align: center; color: var(--text-medium); font-size: 1.1rem; }
.highlight { color: var(--accent-gold); font-weight: bold; }

/* ================= 特色功能 Grid ================= */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 35px;
    align-items: stretch;
}

.feature-item {
    background: var(--bg-dark);
    padding: 35px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: 0.3s;
    background-color: #1a1b1f; 
}
.feature-item:hover {
    transform: translateY(-8px);
    border-color: var(--accent-gold);
    box-shadow: 0 8px 25px var(--shadow-color-light);
}
.feature-item img { width: 70px; height: 70px; margin-bottom: 25px; object-fit: contain; }
.feature-item h3 { color: var(--accent-gold); margin-bottom: 12px; font-size: 1.4rem; }
.feature-item p { color: var(--text-medium); font-size: 1rem; }

/* ================= 下载区域 ================= */
.download-options { display: flex; flex-wrap: wrap; justify-content: center; gap: 35px; }
.download-option {
    background: var(--bg-darkest); padding: 40px; border-radius: 10px;
    border: 1px solid var(--border-color); text-align: center; width: 320px;
    transition: 0.3s;
}
.download-option:hover { transform: translateY(-5px); border-color: var(--accent-gold); }
.download-option img { width: 70px; margin-bottom: 20px; }
.download-btn { display: block; width: 100%; margin-top: 20px; text-align: center; }

.installation-guide {
    margin-top: 50px; background: var(--bg-darkest); padding: 35px;
    border-radius: 10px; border: 1px solid var(--border-color);
}
.installation-guide h3 { font-size: 1.8rem; margin-bottom: 25px; }
.installation-guide h4 { color: var(--accent-gold); margin-top: 20px; }
.installation-guide ol { padding-left: 20px; color: var(--text-medium); }

/* ================= 评价 & FAQ & 联系 ================= */
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 35px; }
.review-card {
    background: var(--bg-dark); padding: 30px; border-radius: 10px;
    border-left: 5px solid var(--accent-gold);
}
.review-avatar { width: 60px; height: 60px; border-radius: 50%; float: left; margin-right: 20px; border: 2px solid var(--accent-gold); }

.faq-item { background: var(--bg-darkest); margin-bottom: 15px; border-radius: 8px; border: 1px solid var(--border-color); }
.faq-item summary { padding: 20px; color: var(--accent-gold); cursor: pointer; font-weight: 500; }
.faq-item p { padding: 0 20px 20px; color: var(--text-medium); }

.contact-methods { display: flex; justify-content: center; gap: 50px; flex-wrap: wrap; }
.contact-method { text-align: center; }
.contact-method img { width: 50px; margin-bottom: 10px; }
.contact-method p { color: var(--text-medium); font-size: 1.1rem; }

footer {
    background: var(--bg-dark); padding: 50px 0; text-align: center;
    border-top: 1px solid var(--border-color); color: #888;
}

/* 动画类 */
.reveal { opacity: 0; transform: translateY(30px); transition: 0.8s ease-out; }
.reveal.active { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.2s; }
.reveal-delay-2 { transition-delay: 0.4s; }

/* ================= 移动端适配 ================= */
@media (max-width: 768px) {
    .nav-toggle { display: block; }
    header nav {
        display: none; position: absolute; top: 100%; left: 0; width: 100%;
        background: var(--bg-dark); flex-direction: column; text-align: center; padding: 20px 0;
    }
    header nav.nav-open { display: flex; }
    nav a { margin: 10px 0; display: block; margin-left: 0; }
    
    #banner h1 { font-size: 2.5rem; }
    h2 { font-size: 1.8rem; }
    .features-grid { grid-template-columns: 1fr; }
}