/* ==================== 官网网站 - 卡通极简风格 ==================== */

/* -- CSS变量 -- */
:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --accent: #f687b3;
    --bg: #f7f8fc;
    --card-bg: #ffffff;
    --text: #2d3748;
    --text-light: #718096;
    --border: #e2e8f0;
    --shadow: 0 4px 20px rgba(0,0,0,0.06);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

/* -- Reset -- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; }
ul { list-style: none; }

/* -- Container -- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* ==================== 导航栏 ==================== */
.navbar {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0 20px;
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.logo {
    font-size: 22px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}
.nav-links {
    display: flex;
    gap: 6px;
}
.nav-links a {
    padding: 8px 16px;
    border-radius: 20px;
    color: var(--text);
    font-size: 15px;
    font-weight: 500;
    transition: all .2s;
}
.nav-links a:hover,
.nav-links a.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
}
.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}
.user-greeting {
    font-size: 14px;
    color: var(--text-light);
}
.nav-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
    padding: 4px;
}
.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 999;
}
/* ==================== 按钮 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    border: 2px solid var(--border);
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    transition: all .25s;
    gap: 6px;
}
.btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102,126,234,0.2);
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border: none;
}
.btn-primary:hover {
    color: #fff;
    box-shadow: 0 6px 20px rgba(102,126,234,0.4);
    transform: translateY(-2px);
}
.btn-sm { padding: 6px 16px; font-size: 13px; }
.btn-block { width: 100%; }
.btn-danger {
    background: linear-gradient(135deg, #f56565, #e53e3e);
    color: #fff;
    border: none;
}
.btn-danger:hover {
    color: #fff;
    box-shadow: 0 6px 20px rgba(229,62,62,0.4);
}

/* ==================== 卡片 ==================== */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    transition: box-shadow .2s, transform .2s;
}
.card:hover {
    box-shadow: var(--shadow-hover);
}
.card-header {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-header h2, .card-header h3 { margin: 0; }

/* ==================== Hero ==================== */
.hero {
    text-align: center;
    padding: 80px 20px 60px;
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
}
.hero h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
}
.hero h1 span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 30px;
}
.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ==================== Section ==================== */
.section {
    padding: 60px 0;
}
.section-title {
    text-align: center;
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 40px;
    position: relative;
}
.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 2px;
    margin: 10px auto 0;
}

/* ==================== Grid ==================== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ==================== 特性/优势卡片 ==================== */
.feature-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all .25s;
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}
.feature-card .icon {
    font-size: 40px;
    margin-bottom: 16px;
}
.feature-card h3 {
    margin-bottom: 10px;
    font-size: 18px;
}
.feature-card p {
    color: var(--text-light);
    font-size: 14px;
}

/* ==================== 产品卡片 ==================== */
.product-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all .25s;
}
.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.product-info {
    padding: 20px;
}
.product-info h3 {
    font-size: 18px;
    margin-bottom: 8px;
}
.product-info p {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 12px;
}
.product-meta {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 8px;
}
.product-meta strong {
    color: var(--text);
}
.product-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}
.product-actions .btn {
    font-size: 13px;
    padding: 6px 14px;
}

/* ==================== 联系我们页面 ==================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}
.contact-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all .25s;
    position: relative;
    overflow: hidden;
}
.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}
.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.contact-card .icon {
    font-size: 48px;
    margin-bottom: 12px;
}
.contact-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}
.contact-card .value {
    font-size: 16px;
    color: var(--primary);
    font-weight: 600;
    word-break: break-all;
}

/* ==================== 导航页 ==================== */
.nav-list {
    display: grid;
    gap: 16px;
}
.nav-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px 24px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all .2s;
}
.nav-item:hover {
    box-shadow: var(--shadow-hover);
    transform: translateX(4px);
}
.nav-item .nav-info h3 { font-size: 16px; margin-bottom: 4px; }
.nav-item .nav-info p { color: var(--text-light); font-size: 13px; }
.nav-item .nav-link { 
    color: var(--primary);
    font-weight: 500;
    white-space: nowrap;
}

/* ==================== 表单 ==================== */
.form-card {
    max-width: 480px;
    margin: 0 auto;
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
    font-size: 14px;
}
.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: border-color .2s;
    font-family: var(--font);
    background: var(--card-bg);
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
}
.form-textarea { min-height: 100px; resize: vertical; }
.form-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.form-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}
.form-hint {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

/* ==================== AI对话框 ==================== */
.chat-container {
    border: 2px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--card-bg);
}
.chat-header {
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}
.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.chat-msg {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.5;
    animation: msgIn .3s ease;
}
.chat-msg.user {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border-bottom-right-radius: 4px;
}
.chat-msg.assistant {
    align-self: flex-start;
    background: #f0f0f5;
    color: var(--text);
    border-bottom-left-radius: 4px;
}
.chat-msg.assistant.loading {
    background: transparent;
}
.chat-input-area {
    display: flex;
    border-top: 1px solid var(--border);
    padding: 12px;
    gap: 8px;
}
.chat-input-area input {
    flex: 1;
    padding: 10px 16px;
    border: 2px solid var(--border);
    border-radius: 25px;
    font-size: 14px;
    outline: none;
    transition: border-color .2s;
}
.chat-input-area input:focus { border-color: var(--primary); }
.chat-input-area .btn {
    border-radius: 25px;
    padding: 10px 20px;
}

@keyframes msgIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}
.typing-dots {
    display: inline-flex;
    gap: 4px;
}
.typing-dots span {
    width: 8px;
    height: 8px;
    background: var(--text-light);
    border-radius: 50%;
    animation: dotJump 1.2s infinite;
}
.typing-dots span:nth-child(2) { animation-delay: .2s; }
.typing-dots span:nth-child(3) { animation-delay: .4s; }
@keyframes dotJump {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-8px); }
}

/* ==================== 后台管理样式 ==================== */
.admin-body {
    display: flex;
    min-height: 100vh;
}
.admin-sidebar {
    width: 240px;
    background: linear-gradient(180deg, var(--text), #1a202c);
    color: #fff;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}
.admin-sidebar .logo {
    padding: 20px;
    font-size: 18px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    -webkit-text-fill-color: #fff;
}
.admin-sidebar nav { flex: 1; padding: 12px; }
.admin-sidebar nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    color: rgba(255,255,255,0.7);
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: all .2s;
    margin-bottom: 4px;
}
.admin-sidebar nav a:hover,
.admin-sidebar nav a.active {
    background: rgba(255,255,255,0.12);
    color: #fff;
}
.admin-sidebar .logout-link {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}
.admin-sidebar .logout-link a {
    color: rgba(255,255,255,0.5);
    font-size: 14px;
}
.admin-main {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}
.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
}
.admin-header h1 { font-size: 24px; font-weight: 700; }
.admin-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}
.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}
.stat-card .num {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-card .label {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 4px;
}

/* -- 后台表单 -- */
.admin-form { max-width: 700px; }
.admin-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-switch {
    display: flex;
    align-items: center;
    gap: 10px;
}
.form-switch input[type="checkbox"] {
    width: 44px;
    height: 24px;
    -webkit-appearance: none;
    appearance: none;
    background: #ccc;
    border-radius: 12px;
    position: relative;
    cursor: pointer;
    transition: background .2s;
}
.form-switch input[type="checkbox"]::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    top: 2px;
    left: 2px;
    transition: transform .2s;
}
.form-switch input[type="checkbox"]:checked {
    background: var(--primary);
}
.form-switch input[type="checkbox"]:checked::before {
    transform: translateX(20px);
}

/* -- 后台表格 -- */
.admin-table {
    width: 100%;
    border-collapse: collapse;
}
.admin-table th, .admin-table td {
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}
.admin-table th {
    font-weight: 600;
    color: var(--text-light);
    background: #fafafa;
}
.admin-table td .actions {
    display: flex;
    gap: 6px;
}

/* -- 弹窗 -- */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}
.modal.show { display: flex; }
.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 30px;
    max-width: 560px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

/* ==================== 消息提示 ==================== */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.alert-success {
    background: #f0fff4;
    color: #276749;
    border: 1px solid #c6f6d5;
}
.alert-error {
    background: #fff5f5;
    color: #9b2c2c;
    border: 1px solid #fed7d7;
}
.alert-info {
    background: #ebf8ff;
    color: #2c5282;
    border: 1px solid #bee3f8;
}

/* ==================== 底部 ==================== */
.footer {
    background: var(--text);
    color: rgba(255,255,255,0.8);
    padding: 50px 0 0;
    margin-top: auto;
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer h3, .footer h4 {
    color: #fff;
    margin-bottom: 16px;
}
.footer p, .footer a {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    line-height: 2;
}
.footer a:hover { color: var(--accent); }
.footer-bottom {
    padding: 20px 0;
    text-align: center;
}
.footer-bottom p { font-size: 13px; margin: 0; }

/* -- 空状态 -- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}
.empty-state .icon { font-size: 48px; margin-bottom: 16px; }

/* -- Toast -- */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 3000;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 14px 20px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    transform: translateX(120%);
    transition: transform .3s ease;
}
.toast.show { transform: translateX(0); }
.toast.success { border-left: 4px solid #48bb78; }
.toast.error { border-left: 4px solid #f56565; }

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        right: -280px;
        width: 260px;
        height: 100vh;
        background: var(--card-bg);
        flex-direction: column;
        padding: 80px 20px 20px;
        box-shadow: -4px 0 20px rgba(0,0,0,0.1);
        transition: right .3s;
        z-index: 1001;
    }
    .nav-links.open { display: flex; right: 0; }
    .nav-links a { padding: 14px 20px; font-size: 16px; }
    .nav-links a:hover, .nav-links a.active { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; }
    .nav-overlay.show { display: block; }
    .nav-actions .btn { font-size: 12px; padding: 6px 12px; }
    
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; gap: 30px; }
    
    .admin-sidebar {
        width: 60px;
        overflow: hidden;
    }
    .admin-sidebar .logo { font-size: 14px; padding: 16px 10px; }
    .admin-sidebar nav a span { display: none; }
    .admin-sidebar nav a { justify-content: center; padding: 12px; }
    .admin-main { padding: 20px 15px; }
    .admin-form .form-row { grid-template-columns: 1fr; }
    
    .hero { padding: 50px 20px 40px; }
    .section { padding: 40px 0; }
    .chat-msg { max-width: 90%; }
}