/* Ula 用户协议 - 现代分段卡片式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.7;
    color: #1e293b;
    background: linear-gradient(180deg, #fef3c7 0%, #fcd34d 50%, #f59e0b 100%);
    padding: 50px 20px;
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: transparent;
}

/* 悬浮卡片头部 */
.header {
    background: white;
    color: #1e293b;
    padding: 50px 40px;
    text-align: center;
    border-radius: 25px;
    box-shadow: 0 25px 50px rgba(0,0,0,0.2);
    margin-bottom: 40px;
    border: 4px solid #fbbf24;
}

.header h1 {
    font-size: 3.2em;
    margin-bottom: 15px;
    font-weight: 900;
    color: #b45309;
}

.header .app-name {
    font-size: 1.4em;
    color: #92400e;
    font-weight: 600;
}

.effective-date {
    background: white;
    padding: 20px 35px;
    text-align: center;
    font-weight: 700;
    color: #92400e;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    margin-bottom: 40px;
    border-left: 8px solid #f59e0b;
}

.content {
    padding: 0;
}

/* 每个section是独立的卡片 */
.section {
    background: white;
    margin-bottom: 35px;
    padding: 45px;
    border-radius: 25px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
    border-left: 10px solid #f59e0b;
    position: relative;
    transition: all 0.4s ease;
}

.section::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    background: linear-gradient(45deg, #fbbf24, #f59e0b);
    border-radius: 25px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.section:hover::before {
    opacity: 0.3;
}

.section:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 60px rgba(245, 158, 11, 0.3);
}

.section h2 {
    color: #b45309;
    font-size: 2em;
    margin-bottom: 25px;
    padding: 15px 25px;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: 15px;
    font-weight: 800;
    display: inline-block;
}

.section h3 {
    color: #d97706;
    font-size: 1.4em;
    margin: 30px 0 15px 0;
    font-weight: 700;
}

.section p {
    margin-bottom: 18px;
    color: #475569;
    line-height: 1.9;
    font-size: 1.05em;
}

.section ul {
    margin: 20px 0 20px 35px;
}

.section li {
    margin-bottom: 12px;
    color: #475569;
    line-height: 1.8;
}

.intro {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    padding: 35px;
    border-radius: 20px;
    border-left: 8px solid #f59e0b;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.highlight-box, .warning-box {
    padding: 30px;
    margin: 30px 0;
    border-radius: 18px;
    border-left: 8px solid;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.highlight-box {
    background: #fef9c3;
    border-left-color: #eab308;
}

.warning-box {
    background: #fee2e2;
    border-left-color: #ef4444;
}

.contact-box {
    background: linear-gradient(135deg, #b45309 0%, #92400e 100%);
    color: white;
    padding: 45px;
    border-radius: 25px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(180, 83, 9, 0.4);
}

.contact-box h2 {
    color: white;
    background: none;
    padding: 0;
    margin-bottom: 20px;
}

.contact-box a {
    color: #fef3c7;
    text-decoration: none;
    font-weight: 700;
    border-bottom: 3px solid #fef3c7;
}

.acknowledgment {
    background: linear-gradient(135deg, #7c2d12 0%, #92400e 100%);
    color: white;
    padding: 35px;
    border-radius: 25px;
    text-align: center;
    font-size: 1.15em;
    font-weight: 700;
    margin: 40px 0;
    box-shadow: 0 20px 50px rgba(124, 45, 18, 0.4);
}

.footer {
    background: #1e293b;
    color: #cbd5e1;
    padding: 40px;
    border-radius: 25px;
    text-align: center;
    margin-top: 50px;
}

@media (max-width: 768px) {
    body {
        padding: 20px 10px;
    }

    .header {
        padding: 35px 25px;
    }

    .header h1 {
        font-size: 2.2em;
    }

    .section {
        padding: 30px 25px;
        margin-bottom: 25px;
    }

    .section h2 {
        font-size: 1.6em;
        padding: 12px 20px;
    }
}