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

:root {
    --primary-color: #d4af37;
    --secondary-color: #1a1a2e;
    --accent-color: #16213e;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --info: #17a2b8;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

/* 导航栏 */
.navbar {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--box-shadow);
}

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

.logo h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 1rem;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.login-btn {
    background-color: var(--primary-color);
    padding: 0.5rem 1.5rem;
    border-radius: var(--border-radius);
    color: var(--secondary-color) !important;
    font-weight: bold;
}

.login-btn:hover {
    background-color: #c9a131;
    color: var(--secondary-color) !important;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero-content .subtitle {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.hero-content .description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.8rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #c9a131;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

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

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

/* 公司介绍 */
.about {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 3rem;
}

.about-card {
    background-color: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    margin-bottom: 3rem;
}

.about-card .icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.about-card h3 {
    color: var(--secondary-color);
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.about-card p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.stat-item h4 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-item p {
    color: #666;
    font-size: 1.1rem;
}

/* 产品优势 */
.features {
    padding: 4rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--secondary-color);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* 系统功能模块 */
.modules {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.module-item {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.module-item h4 {
    color: var(--secondary-color);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.module-item ul {
    list-style: none;
}

.module-item li {
    padding: 0.5rem 0;
    color: #666;
    position: relative;
    padding-left: 1.5rem;
}

.module-item li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* 联系我们 */
.contact {
    padding: 4rem 0;
}

.contact-content {
    max-width: 800px;
    margin: 3rem auto;
    background-color: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.info-item {
    margin-bottom: 1.5rem;
}

.info-item strong {
    color: var(--secondary-color);
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.info-item p {
    color: #666;
    font-size: 1rem;
}

/* 页脚 */
.footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    margin: 0.5rem 0;
    opacity: 0.8;
}

/* 登录页面 */
.login-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-container {
    display: flex;
    max-width: 1000px;
    width: 100%;
    gap: 2rem;
    align-items: center;
}

.login-box {
    background-color: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    flex: 1;
    max-width: 450px;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.login-header h2 {
    color: var(--secondary-color);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: #666;
    font-size: 0.95rem;
}

.alert {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    text-align: center;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.login-form .form-group {
    margin-bottom: 1.5rem;
}

.login-form label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--secondary-color);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.login-form input[type="text"],
.login-form input[type="password"] {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.3s;
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox input {
    cursor: pointer;
}

.forgot-password {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
}

.forgot-password:hover {
    text-decoration: underline;
}

.btn-login {
    width: 100%;
    padding: 1rem;
    background-color: var(--primary-color);
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 1.1rem;
}

.btn-login:hover {
    background-color: #c9a131;
}

.login-footer {
    margin-top: 2rem;
    text-align: center;
}

.demo-account {
    background-color: #e7f3ff;
    padding: 0.8rem;
    border-radius: var(--border-radius);
    color: #0066cc;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.login-footer .links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    align-items: center;
}

.login-footer a {
    color: #666;
    text-decoration: none;
    font-size: 0.9rem;
}

.login-footer a:hover {
    color: var(--primary-color);
}

.login-info {
    flex: 1;
    color: var(--white);
    max-width: 400px;
}

.login-info h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

.login-info ul {
    list-style: none;
}

.login-info li {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
}

.login-info .check {
    font-size: 1.5rem;
    color: #4ade80;
}

.login-info strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.login-info p {
    opacity: 0.9;
    font-size: 0.95rem;
}

/* 系统主页 */
.dashboard-page {
    background-color: #f0f2f5;
    min-height: 100vh;
}

.dashboard-header {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--box-shadow);
}

.header-left h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.header-right {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.welcome {
    font-size: 1rem;
}

.btn-logout {
    padding: 0.5rem 1.5rem;
    background-color: var(--primary-color);
    color: var(--secondary-color);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: bold;
    transition: background-color 0.3s;
}

.btn-logout:hover {
    background-color: #c9a131;
}

.dashboard-container {
    display: flex;
    min-height: calc(100vh - 70px);
}

/* 侧边栏 */
.sidebar {
    width: 250px;
    background-color: var(--white);
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.05);
    padding: 1.5rem 0;
}

.sidebar-nav .nav-section {
    margin-bottom: 2rem;
}

.sidebar-nav h3 {
    padding: 0 1.5rem;
    font-size: 0.9rem;
    color: #999;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li a {
    display: block;
    padding: 0.8rem 1.5rem;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s;
}

.sidebar-nav li a:hover,
.sidebar-nav li.active a {
    background-color: #f0f2f5;
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
}

/* 主内容区 */
.dashboard-main {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

.dashboard-main section {
    margin-bottom: 2rem;
}

.dashboard-main h2 {
    color: var(--secondary-color);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

/* 数据概览 */
.overview-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.overview-card {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.overview-card .card-icon {
    font-size: 3rem;
    opacity: 0.8;
}

.overview-card .card-content h3 {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.overview-card .number {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.3rem;
}

.overview-card .number span {
    font-size: 1rem;
    margin-left: 0.3rem;
}

.overview-card .label {
    font-size: 0.85rem;
    opacity: 0.7;
}

.card-blue { color: #3b82f6; }
.card-blue .card-icon { color: #3b82f6; }
.card-blue .number { color: #3b82f6; }

.card-green { color: #10b981; }
.card-green .card-icon { color: #10b981; }
.card-green .number { color: #10b981; }

.card-orange { color: #f59e0b; }
.card-orange .card-icon { color: #f59e0b; }
.card-orange .number { color: #f59e0b; }

.card-purple { color: #8b5cf6; }
.card-purple .card-icon { color: #8b5cf6; }
.card-purple .number { color: #8b5cf6; }

/* 快捷操作 */
.quick-actions {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.action-btn {
    padding: 1.5rem 1rem;
    background-color: var(--light-bg);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.action-btn:hover {
    border-color: var(--primary-color);
    background-color: var(--white);
    transform: translateY(-2px);
}

.action-btn .icon {
    font-size: 2rem;
}

/* 待办事项 */
.todos {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.todo-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.todo-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    align-items: center;
    border-left: 4px solid transparent;
}

.todo-item.priority-high {
    border-left-color: var(--danger);
}

.todo-item.priority-medium {
    border-left-color: var(--warning);
}

.todo-item.priority-low {
    border-left-color: var(--info);
}

.todo-icon {
    font-size: 1.5rem;
}

.todo-content {
    flex: 1;
}

.todo-content h4 {
    color: var(--secondary-color);
    margin-bottom: 0.3rem;
}

.todo-content p {
    font-size: 0.9rem;
    color: #666;
}

.btn-small {
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: var(--secondary-color);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

.btn-small:hover {
    background-color: #c9a131;
}

/* 库存预警 */
.alerts {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.alert-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.alert-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    align-items: center;
}

.alert-icon {
    font-size: 1.5rem;
}

.alert-icon.warning {
    color: var(--warning);
}

.alert-icon.info {
    color: var(--info);
}

.alert-content h4 {
    color: var(--secondary-color);
    margin-bottom: 0.3rem;
}

.alert-content p {
    font-size: 0.9rem;
    color: #666;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .features-grid,
    .modules-grid {
        grid-template-columns: 1fr;
    }
    
    .login-container {
        flex-direction: column;
    }
    
    .login-info {
        display: none;
    }
    
    .dashboard-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
}