/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'KaiTi', 'STKaiti', 'SimKai', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #0a0a1a 0%, #161a3a 50%, #0a0a2a 100%);
    color: #e0e0e0;
    min-height: 100vh;
    overflow-x: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ==================== 顶部导航 ==================== */
.header {
    background: linear-gradient(90deg, rgba(0,30,60,0.95) 0%, rgba(0,20,40,0.95) 100%);
    border-bottom: 2px solid rgba(0,255,255,0.3);
    box-shadow: 0 4px 30px rgba(0,255,255,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #00ffff;
    text-shadow: 0 0 20px rgba(0,255,255,0.5);
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 28px;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 10px 20px;
    color: #a0a0a0;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 16px;
    border: 1px solid transparent;
}

.nav-link:hover {
    color: #00ffff;
    background: rgba(0,255,255,0.1);
    border-color: rgba(0,255,255,0.2);
}

.nav-link.active {
    color: #00ffff;
    background: rgba(0,255,255,0.15);
    border-color: rgba(0,255,255,0.4);
    box-shadow: 0 0 15px rgba(0,255,255,0.2);
}

/* ==================== 主内容区 ==================== */
.main-content {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 24px;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* ==================== 首页 ==================== */
.hero-section {
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 40px;
    background: radial-gradient(ellipse at center, rgba(0,100,150,0.15) 0%, transparent 70%);
    border-radius: 16px;
    border: 1px solid rgba(0,255,255,0.1);
}

.hero-content h2 {
    font-size: 36px;
    color: #00ffff;
    margin-bottom: 12px;
    text-shadow: 0 0 30px rgba(0,255,255,0.3);
}

.hero-content p {
    font-size: 18px;
    color: #a0a0a0;
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.model-card {
    background: linear-gradient(145deg, rgba(0,20,40,0.8) 0%, rgba(0,10,30,0.9) 100%);
    border: 1px solid rgba(0,255,255,0.2);
    border-radius: 16px;
    padding: 28px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.model-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 40px rgba(0,255,255,0.2);
    border-color: rgba(0,255,255,0.4);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.model-card h3 {
    font-size: 20px;
    color: #00ffff;
    margin-bottom: 12px;
}

.model-card p {
    font-size: 15px;
    color: #909090;
    line-height: 1.6;
    margin-bottom: 20px;
}

.btn-primary {
    background: linear-gradient(135deg, rgba(0,150,150,0.3) 0%, rgba(0,100,100,0.4) 100%);
    border: 1px solid rgba(0,255,255,0.4);
    color: #00ffff;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: rgba(0,255,255,0.2);
    box-shadow: 0 0 20px rgba(0,255,255,0.3);
    transform: scale(1.02);
}

/* ==================== 添加模型提示 ==================== */
.add-model-section {
    display: flex;
    justify-content: center;
    margin-bottom: 32px;
}

.add-model-card {
    background: linear-gradient(145deg, rgba(20,20,40,0.6) 0%, rgba(10,10,30,0.7) 100%);
    border: 2px dashed rgba(0,255,255,0.2);
    border-radius: 16px;
    padding: 40px 60px;
    text-align: center;
}

.add-model-card .card-icon {
    font-size: 56px;
    color: rgba(0,255,255,0.4);
}

.add-model-card h3 {
    color: rgba(0,255,255,0.5);
}

.add-model-card p {
    color: #707070;
}

/* ==================== iframe容器 ==================== */
#iframe-container {
    height: calc(100vh - 180px);
}

.iframe-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(0,255,255,0.2);
}

.btn-back {
    background: rgba(0,100,150,0.3);
    border: 1px solid rgba(0,255,255,0.3);
    color: #00ffff;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.btn-back:hover {
    background: rgba(0,255,255,0.2);
    box-shadow: 0 0 15px rgba(0,255,255,0.2);
}

.model-title {
    font-size: 18px;
    color: #00ffff;
    font-weight: bold;
}

#model-iframe {
    width: 100%;
    height: 100%;
    border: 1px solid rgba(0,255,255,0.2);
    border-radius: 12px;
    background: #0a0a0a;
}

/* ==================== 底部 ==================== */
.footer {
    text-align: center;
    padding: 24px;
    color: #606060;
    border-top: 1px solid rgba(0,255,255,0.1);
    margin-top: auto;
}

.footer p {
    font-size: 14px;
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 16px;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .logo {
        font-size: 20px;
    }
    
    .hero-content h2 {
        font-size: 28px;
    }
    
    .models-grid {
        grid-template-columns: 1fr;
    }
}