/* ==================== CSS变量系统 ==================== */
:root {
    /* 主色调 - 渐变蓝紫 */
    --primary-color: #667eea;
    --primary-light: #764ba2;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* 辅助色 */
    --secondary-color: #f093fb;
    --accent-color: #4facfe;
    --success-color: #00f2fe;
    --warning-color: #feca57;

    /* 中性色 */
    --bg-color: #0f0c29;
    --bg-secondary: #1a1736;
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --text-light: #b2bec3;

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.15);
    --shadow-hover: 0 12px 32px rgba(102, 126, 234, 0.3);

    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-color);
    background-image:
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ==================== 头部样式 ==================== */
.header {
    text-align: center;
    padding: var(--spacing-lg) 0 var(--spacing-xs);
    animation: fadeInDown 0.8s ease;
}

.logo {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, #f093fb 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 3.5rem;
    filter: drop-shadow(0 4px 8px rgba(102, 126, 234, 0.3));
}

.subtitle {
    color: var(--text-light);
    font-size: 1.2rem;
    font-weight: 300;
}

/* ==================== 卡片网格 ==================== */
.main-content {
    margin: var(--spacing-sm) 0;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    padding: 0;
}

/* ==================== 功能卡片 ==================== */
.feature-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.feature-card.coming-soon {
    opacity: 0.6;
    cursor: not-allowed;
}

.feature-card.coming-soon:hover {
    transform: none;
    box-shadow: var(--shadow-md);
}

.card-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.card-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.card-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.5;
}

.card-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-gradient);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.card-badge.soon {
    background: linear-gradient(135deg, #feca57 0%, #ff9ff3 100%);
}

/* ==================== 底部样式 ==================== */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    color: var(--text-light);
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: var(--spacing-xl);
}

/* ==================== 通用按钮样式 ==================== */
.btn {
    padding: 0.9rem 2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    outline: none;
    box-shadow: var(--shadow-sm);
}

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

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    border: 2px solid rgba(102, 126, 234, 0.3);
}

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

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.4rem;
}

/* ==================== 通用输入框样式 ==================== */
.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
}

.input {
    width: 100%;
    padding: 0.8rem 1.2rem;
    border: 2px solid #e1e8ed;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    outline: none;
}

textarea.input {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

/* ==================== 动画 ==================== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .logo {
        font-size: 2rem;
    }

    .logo-icon {
        font-size: 2.5rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .feature-card {
        padding: var(--spacing-lg);
    }

    .card-title {
        font-size: 1.5rem;
    }
}

/* ==================== 返回按钮（模块页面用） ==================== */
.back-btn {
    position: fixed;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-primary);
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    z-index: 1000;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.back-btn:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(-4px);
}

/* ==================== 模块页面布局 ==================== */
.module-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.module-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    margin-top: var(--spacing-lg);
}

.module-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ==================== 精美弹窗系统 ==================== */

/* Toast 通知 */
.toast-container {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
    pointer-events: none;
}

.toast {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 12px 24px;
    border-radius: 50px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    color: #2d3436;
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: toastSlideUp 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: auto;
    min-width: 300px;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.toast.success { border-left: 4px solid #00b894; }
.toast.error { border-left: 4px solid #d63031; }
.toast.info { border-left: 4px solid #0984e3; }

@keyframes toastSlideUp {
    from { opacity: 0; transform: translateY(20px) scale(0.9); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toastFadeOut {
    to { opacity: 0; transform: translateY(-20px) scale(0.9); }
}

/* 模态框 (Alert/Confirm/Prompt) */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 12, 41, 0.6);
    backdrop-filter: blur(4px);
    z-index: 10001;
    display: flex;
    align-items: center; /* 垂直居中 */
    justify-content: center; /* 水平居中 */
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.custom-modal {
    background: rgba(255, 255, 255, 0.98);
    width: 90%;
    max-width: 400px;
    border-radius: 24px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    transform: translateY(20px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.modal-overlay.active .custom-modal {
    transform: translateY(0) scale(1);
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: #2d3436;
    text-align: center;
}

.modal-message {
    font-size: 1rem;
    color: #636e72;
    margin-bottom: 25px;
    line-height: 1.6;
    text-align: center;
}

.modal-input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e8ed;
    border-radius: 12px;
    font-size: 1rem;
    margin-bottom: 25px;
    transition: all 0.3s;
    outline: none;
    background: #f8f9fa;
    text-align: center;
    box-sizing: border-box;
}

.modal-input:focus {
    border-color: var(--primary-color);
    background: white;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.modal-btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.modal-btn.primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.modal-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

.modal-btn.secondary {
    background: #f1f2f6;
    color: #636e72;
}

.modal-btn.secondary:hover {
    background: #e1e8ed;
    color: #2d3436;
}