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

/* CSS变量定义 - NBA 2K主题色彩 */
:root {
    --primary-color: #1a73e8;
    --secondary-color: #f39c12;
    --accent-color: #e74c3c;
    --dark-bg: #0f0f0f;
    --darker-bg: #000000;
    --card-bg: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    --border-color: #333333;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --gradient-primary: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
    --gradient-secondary: linear-gradient(135deg, #f39c12 0%, #ff9800 100%);
    --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.5);
    --border-radius: 8px;
    --border-radius-large: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--dark-bg);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    background: var(--darker-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 12px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.btn-premium {
    background: var(--gradient-secondary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-premium:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.mobile-menu-toggle {
    display: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* 英雄区域样式 */
.hero {
    background: var(--darker-bg);
    padding: 140px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(26, 115, 232, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 20%, rgba(243, 156, 18, 0.1) 0%, transparent 50%);
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
}

.btn-primary, .btn-secondary {
    padding: 16px 32px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 球员创建工具样式 */
.builder-section {
    padding: 100px 0;
    background: var(--dark-bg);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 60px;
    font-size: 1.1rem;
}

.builder-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 40px;
}

.builder-controls {
    background: var(--card-bg);
    border-radius: var(--border-radius-large);
    padding: 30px;
    border: 1px solid var(--border-color);
}

.control-group {
    margin-bottom: 30px;
}

.control-group h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 600;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-group input[type="text"],
.form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input[type="text"]:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.slider {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    margin-bottom: 8px;
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.value {
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.attribute-container {
    display: grid;
    gap: 16px;
}

.attribute-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.attribute-item label {
    min-width: 60px;
    margin-bottom: 0;
    font-size: 0.9rem;
}

.attribute-item .slider {
    flex: 1;
    margin-bottom: 0;
}

.attribute-item .value {
    min-width: 30px;
    text-align: right;
}

.points-remaining {
    background: var(--dark-bg);
    padding: 12px 16px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
    margin-top: 20px;
}

/* 预览面板样式 */
.builder-preview {
    background: var(--card-bg);
    border-radius: var(--border-radius-large);
    padding: 30px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.player-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: var(--dark-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.player-avatar {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.player-info h3 {
    color: var(--text-primary);
    margin-bottom: 4px;
    font-size: 1.3rem;
}

.player-details {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stats-preview h4,
.badges-preview h4 {
    color: var(--primary-color);
    margin-bottom: 16px;
    font-size: 1.1rem;
}

.stat-bars {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.stat-bar {
    display: flex;
    align-items: center;
    gap: 12px;
}

.stat-bar span:first-child {
    min-width: 50px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.bar {
    flex: 1;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.fill {
    height: 100%;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.stat-bar span:last-child {
    min-width: 30px;
    text-align: right;
    font-weight: 600;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.badge-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.badge {
    padding: 6px 12px;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge.gold {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4a 100%);
    color: #000;
}

.badge.silver {
    background: linear-gradient(135deg, #c0c0c0 0%, #e6e6e6 100%);
    color: #000;
}

.badge.bronze {
    background: linear-gradient(135deg, #cd7f32 0%, #d2b48c 100%);
    color: #000;
}

.action-buttons {
    display: flex;
    gap: 12px;
}

.btn-save, .btn-share, .btn-analyze {
    flex: 1;
    padding: 12px 16px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.btn-save {
    background: var(--success-color);
    color: white;
}

.btn-share {
    background: var(--secondary-color);
    color: white;
}

.btn-analyze {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-save:hover, .btn-share:hover, .btn-analyze:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* 社区区域样式 */
.community-section {
    padding: 100px 0;
    background: var(--darker-bg);
}

.build-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.build-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-large);
    padding: 24px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.build-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--primary-color);
}

.build-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.build-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.build-info h3 {
    color: var(--text-primary);
    margin-bottom: 4px;
    font-size: 1.1rem;
}

.build-info p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.build-rating {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--secondary-color);
    font-weight: 600;
}

.build-stats {
    margin-bottom: 16px;
}

.stat-mini {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.stat-mini span {
    min-width: 50px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.mini-bar {
    flex: 1;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.mini-fill {
    height: 100%;
    background: var(--gradient-primary);
}

.build-badges {
    margin-bottom: 20px;
}

.mini-badge {
    display: inline-block;
    padding: 4px 8px;
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-right: 8px;
    margin-bottom: 4px;
}

.build-actions {
    display: flex;
    gap: 8px;
}

.btn-small {
    flex: 1;
    padding: 8px 12px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-small:not(.secondary) {
    background: var(--primary-color);
    color: white;
}

.btn-small.secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-small:hover {
    transform: translateY(-1px);
}

.community-actions {
    text-align: center;
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* 功能特色样式 */
.features-section {
    padding: 100px 0;
    background: var(--dark-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.feature-card {
    background: var(--card-bg);
    padding: 40px 30px;
    border-radius: var(--border-radius-large);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 1.3rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 页脚样式 */
.footer {
    background: var(--darker-bg);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 1.1rem;
    font-weight: 600;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
    text-align: center;
    color: var(--text-muted);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .builder-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons .btn-primary,
    .hero-buttons .btn-secondary {
        width: 100%;
        max-width: 300px;
    }
    
    .build-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .community-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .community-actions .btn-primary,
    .community-actions .btn-secondary {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .builder-controls,
    .builder-preview {
        padding: 20px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .build-card {
        padding: 20px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #1557b0;
}

/* 选中文本样式 */
::selection {
    background: var(--primary-color);
    color: white;
}

/* 加载动画 */
.loading {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

/* 辅助类 */
.text-center {
    text-align: center;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }