:root {
    --primary-color: #f1c40f; /* 柠檬黄 */
    --primary-hover: #d4ac0d;
    --bg-gradient-start: #1a1a1a;
    --bg-gradient-end: #000000;
    --text-color: #ffffff;
    --text-secondary: #aaaaaa;
    --card-bg: #2d2d2d;
    --accent-color: #e74c3c; /* 红色强调 */
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 480px; /* 模拟手机宽度 */
    background-color: #1e1e1e;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    padding-bottom: 40px;
}

/* Header */
.header {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(to bottom, #2c2c2c, #1e1e1e);
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
}

.logo-img-container {
    width: 80px;
    height: 80px;
    margin: 0 auto 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 20px;
    box-shadow: 0 5px 15px rgba(241, 196, 15, 0.3);
}

.header h1 {
    font-size: 24px;
    margin-bottom: 5px;
    font-weight: bold;
}

.header p {
    color: var(--primary-color);
    font-size: 14px;
    letter-spacing: 1px;
}

/* Main Content */
main {
    padding: 20px;
}

/* Invite Section */
.invite-section {
    text-align: center;
    margin-bottom: 30px;
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: 12px;
}

.invite-section p {
    font-size: 14px;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.highlight {
    color: var(--primary-color);
    font-weight: bold;
}

.invite-box {
    background-color: #3d3d3d;
    padding: 10px 15px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #444;
}

.copy-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
}

.copy-btn:hover {
    text-decoration: underline;
}

/* Buttons */
.btn {
    display: block;
    width: 100%;
    padding: 15px;
    border-radius: 50px;
    text-align: center;
    text-decoration: none;
    margin-bottom: 15px;
    font-weight: bold;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.98);
}

.download-btn {
    color: #333;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.download-btn.android {
    background: linear-gradient(to right, #a4c639, #8aa829);
    color: white;
}

.download-btn.ios {
    background: linear-gradient(to right, #ffffff, #e0e0e0);
    color: #333;
}

.sub-text {
    font-size: 12px;
    opacity: 0.8;
    margin-left: 5px;
    font-weight: normal;
}

.action-btn {
    background-color: var(--card-bg);
    color: var(--text-secondary);
    border: 1px solid #444;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.action-btn.vip {
    color: #ffd700;
    border-color: #ffd700;
}

.action-btn:hover {
    background-color: #383838;
}

/* Stats */
.stats-section {
    display: flex;
    justify-content: space-between;
    margin: 30px 0;
    padding: 20px;
    background-color: var(--card-bg);
    border-radius: 12px;
}

.stat-item {
    text-align: center;
}

.stat-num {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Features */
.features-section h2, .faq-section h2 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 18px;
    position: relative;
    display: inline-block;
    width: 100%;
}

.features-section h2::after, .faq-section h2::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 5px auto 0;
    border-radius: 2px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 15px 10px;
    border-radius: 10px;
    text-align: center;
}

.icon-box {
    width: 40px;
    height: 40px;
    background-color: rgba(241, 196, 15, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
    color: var(--primary-color);
    font-size: 18px;
}

.feature-card h3 {
    font-size: 14px;
    margin-bottom: 5px;
}

.feature-card p {
    font-size: 10px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* FAQ Section */
.faq-section {
    margin-top: 30px;
}

.faq-container {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
}

.faq-item {
    margin-bottom: 20px;
    border-bottom: 1px solid #444;
    padding-bottom: 15px;
}

.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.faq-item h3 {
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 8px;
    line-height: 1.4;
}

.faq-item p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq-item strong {
    color: #fff;
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 12px;
    border-top: 1px solid #333;
    margin-top: 20px;
}