/**
 * 思悟数学 - 主布局样式
 * 替换原有的内联样式,使用现代化设计系统
 */

/* ==================== CSS变量定义 ==================== */
:root {
    --color-primary: #4A90E2;
    --color-primary-dark: #357ABD;
    --color-primary-light: #6BA3E8;
    --color-primary-50: rgba(74, 144, 226, 0.05);
    --color-primary-100: rgba(74, 144, 226, 0.1);
}

/* ==================== 全局重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    min-height: 100vh;
    color: var(--color-gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 动画背景 ==================== */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    overflow: hidden;
}

.bg-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    animation: float 20s ease-in-out infinite;
}

.bg-animation::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: float 30s ease-in-out infinite reverse;
}

/* ==================== 头部导航 ==================== */
.header {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-4) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-base);
}

.header:hover {
    background: rgba(255, 255, 255, 0.2);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: scale(1.05);
}

.logo i {
    font-size: var(--text-3xl);
    animation: pulse 2s ease-in-out infinite;
}

/* ==================== 导航菜单 ==================== */
.nav-menu {
    display: flex;
    gap: var(--spacing-2);
    list-style: none;
}

.nav-menu li {
    margin: 0;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-weight: 500;
    font-size: var(--text-sm);
}

.nav-menu a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.nav-menu a.active {
    background: rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* ==================== 用户信息区 ==================== */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: var(--text-lg);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-base);
}

.user-avatar:hover {
    transform: scale(1.1) rotate(5deg);
}

.user-name {
    color: white;
    font-weight: 500;
    font-size: var(--text-base);
}

/* ==================== 主容器 ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-8) var(--spacing-6);
}

/* ==================== 内容区域 ==================== */
.content-section {
    display: none;
    animation: fadeInUp 0.5s ease-out;
}

.content-section.active {
    display: block;
}

/* ==================== 卡片样式 ==================== */
.card {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--spacing-6);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-2xl);
    transform: translateY(-4px);
}

.card-header {
    margin-bottom: var(--spacing-6);
    padding-bottom: var(--spacing-4);
    border-bottom: 2px solid var(--color-gray-100);
}

.card-title {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.card-title i {
    color: var(--color-primary);
}

.card-description {
    font-size: var(--text-base);
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* ==================== 按钮样式 ==================== */
.btn {
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-gray-200);
}

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

.btn-outline:hover:not(:disabled) {
    background: var(--color-primary);
    color: white;
}

/* ==================== 表单样式 ==================== */
.form-group {
    margin-bottom: var(--spacing-5);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-weight: 600;
    color: var(--color-gray-700);
    font-size: var(--text-sm);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    transition: all var(--transition-base);
    font-family: inherit;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* ==================== 工具类 ==================== */
.hidden {
    display: none !important;
}

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

.text-right {
    text-align: right;
}

.mt-4 {
    margin-top: var(--spacing-4);
}

.mb-4 {
    margin-bottom: var(--spacing-4);
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.gap-4 {
    gap: var(--spacing-4);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-4);
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }

    .container {
        padding: var(--spacing-4);
    }

    .card {
        padding: var(--spacing-5);
    }

    .card-title {
        font-size: var(--text-2xl);
    }
}

/* ==================== PC端精致边框增强样式 ==================== */
/* 卡片精致边框 - 增加高级感 */
.card {
    border: 2px solid rgba(102, 126, 234, 0.12);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08),
                0 1px 4px rgba(0, 0, 0, 0.04),
                inset 0 0 0 1px rgba(255, 255, 255, 0.6);
}

.card:hover {
    border-color: rgba(102, 126, 234, 0.25);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.12),
                0 4px 12px rgba(0, 0, 0, 0.06),
                inset 0 0 0 1px rgba(255, 255, 255, 0.7);
}

/* 玻璃态卡片边框 */
.glass-card {
    border: 2px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1),
                inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}

/* 功能卡片边框 */
.feature-card {
    border: 2px solid rgba(102, 126, 234, 0.15);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08),
                inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.feature-card:hover {
    border-color: rgba(102, 126, 234, 0.3);
}