/* SKZSoft Website Styles - Modern UI Upgrade */

/* ============================================
   1. CSS Variables & Color System
   ============================================ */
:root {
    /* Primary Colors - Modern Blue-Purple Gradient */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-bg: #eef2ff;

    /* Secondary Colors - Warm Accent */
    --secondary-color: #f59e0b;
    --secondary-dark: #d97706;
    --secondary-light: #fbbf24;

    /* Semantic Colors */
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;

    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-light: #ffffff;
    --text-muted: #6b7280;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    --gradient-dark: linear-gradient(180deg, #1f2937 0%, #111827 100%);
    --gradient-light: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Poppins', var(--font-sans);
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Transitions */
    --transition-fast: 150ms;
    --transition: 300ms;
    --transition-slow: 500ms;

    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ============================================
   2. Base & Reset Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

* {
    margin: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--gray-50);
    min-height: 100vh;
    padding-top: 76px;
}

/* ============================================
   3. Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.375rem; }
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* ============================================
   4. Navigation & Header
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    padding: var(--spacing-md) 0;
    background: rgba(255, 255, 255, 0.8) !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.navbar.scrolled {
    padding: var(--spacing-sm) 0;
    background: rgba(255, 255, 255, 0.95) !important;
    box-shadow: var(--shadow-lg);
}

.navbar-brand {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-brand:hover {
    color: var(--primary-dark) !important;
}

.navbar-brand img {
    height: 40px;
    width: auto;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-item {
    position: relative;
}

.nav-link {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9375rem;
    padding: var(--spacing-sm) var(--spacing-md) !important;
    color: var(--gray-700) !important;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
    transform: translateX(-50%);
}

.nav-link:hover {
    color: var(--primary-color) !important;
    background: var(--primary-bg);
}

.nav-link:hover::before {
    width: 60%;
}

.nav-link.active {
    color: var(--primary-color) !important;
}

.nav-link.active::before {
    width: 60%;
}

/* ============================================
   5. Buttons
   ============================================ */
.btn {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9375rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 14px 0 rgb(99 102 241 / 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgb(99 102 241 / 0.23);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--gradient-secondary);
    color: var(--white);
    box-shadow: 0 4px 14px 0 rgb(245 158 11 / 0.39);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgb(245 158 11 / 0.23);
}

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

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

.btn-light {
    background: var(--white);
    color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.btn-light:hover {
    background: var(--gray-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-ghost {
    background: transparent;
    color: var(--gray-600);
}

.btn-ghost:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1.0625rem;
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.875rem;
}

/* ============================================
   6. Cards & Containers
   ============================================ */
.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--gray-300);
}

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition);
}

.card:hover .card-img {
    transform: scale(1.05);
}

.card-img-wrapper {
    overflow: hidden;
    position: relative;
}

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

.card-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.card-text {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ============================================
   7. Hero Section
   ============================================ */
.hero-section {
    position: relative;
    min-height: 500px;
    height: 60vh;
    max-height: 700px;
    display: flex;
    align-items: center;
    background: var(--gradient-primary);
    overflow: hidden;
}

.hero-section .carousel,
.hero-section .carousel-inner,
.hero-section .carousel-item {
    width: 100%;
    height: 100%;
}

.hero-section .carousel-item > div {
    min-height: 100%;
}

.hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    color: var(--white);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

@media (max-width: 768px) {
    .hero-section {
        min-height: 400px;
        height: 50vh;
        max-height: 500px;
    }
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { font-size: 1.125rem; }
}

/* ============================================
   8. Sections & Containers
   ============================================ */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    text-align: center;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================
   9. Feature Cards
   ============================================ */
.feature-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-light);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
    box-shadow: 0 10px 40px 0 rgb(99 102 241 / 0.3);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.feature-text {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ============================================
   10. Article Cards
   ============================================ */
.article-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-light);
}

.article-card-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: var(--transition);
}

.article-card:hover .article-card-img {
    transform: scale(1.08);
}

.article-card-img-wrapper {
    overflow: hidden;
    position: relative;
}

.article-card-badge {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.article-card-body {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

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

.article-card-text {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-100);
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ============================================
   11. Footer
   ============================================ */
.footer {
    background: var(--gradient-dark);
    color: var(--gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-brand {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.footer-text {
    color: var(--gray-400);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-400);
    transition: var(--transition-fast);
    font-size: 0.9375rem;
}

.footer-links a:hover {
    color: var(--white);
    padding-left: var(--spacing-xs);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: var(--transition-fast);
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    text-align: center;
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* ============================================
   12. Badges & Tags
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-primary {
    background: var(--primary-bg);
    color: var(--primary-color);
}

.badge-success {
    background: #d1fae5;
    color: #059669;
}

.badge-warning {
    background: #fef3c7;
    color: #d97706;
}

.badge-danger {
    background: #fee2e2;
    color: #dc2626;
}

/* ============================================
   13. Form Elements
   ============================================ */
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    background: var(--white);
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.form-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   14. Animations
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.animate-slide-left {
    animation: slideInLeft 0.6s ease forwards;
}

.animate-slide-right {
    animation: slideInRight 0.6s ease forwards;
}

.animate-scale-in {
    animation: scaleIn 0.5s ease forwards;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* Stagger animations for lists */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }
.stagger-6 { animation-delay: 0.6s; }

/* ============================================
   15. Utility Classes
   ============================================ */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: var(--gradient-primary);
}

.bg-gradient-secondary {
    background: var(--gradient-secondary);
}

.shadow-primary {
    box-shadow: 0 10px 40px 0 rgb(99 102 241 / 0.3);
}

.border-gradient {
    border: 2px solid transparent;
    background: linear-gradient(white, white) padding-box,
                var(--gradient-primary) border-box;
}

.hover-lift {
    transition: var(--transition);
}

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

/* ============================================
   16. Responsive Utilities
   ============================================ */
@media (max-width: 768px) {
    .section {
        padding: var(--spacing-2xl) 0;
    }

    .section-title {
        font-size: 1.875rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .hide-mobile {
        display: none !important;
    }
}

@media (min-width: 769px) {
    .hide-desktop {
        display: none !important;
    }
}

/* ============================================
   17. Loading States
   ============================================ */
.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================
   18. Scrollbar Styling
   ============================================ */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* ============================================
   19. Custom Selection
   ============================================ */
::selection {
    background: var(--primary-color);
    color: var(--white);
}

::-moz-selection {
    background: var(--primary-color);
    color: var(--white);
}

/* ============================================
   20. Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: 100px;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: var(--z-fixed);
    cursor: pointer;
    border: none;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 45px 0 rgb(99 102 241 / 0.4);
}

/* ============================================
   21. Page Headers
   ============================================ */
.page-header {
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(255,255,255,0.08) 0%, transparent 50%);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 800;
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.page-breadcrumb {
    font-size: 0.9375rem;
    opacity: 0.85;
    position: relative;
}

.page-breadcrumb a {
    color: rgba(255, 255, 255, 0.85);
}

.page-breadcrumb a:hover {
    color: var(--white);
}

/* ============================================
   22. Pagination
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-2xl);
}

.page-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--gray-600);
    background: var(--white);
    border: 1px solid var(--gray-200);
    transition: var(--transition-fast);
}

.page-link:hover {
    background: var(--primary-bg);
    border-color: var(--primary-light);
    color: var(--primary-color);
}

.page-item.active .page-link {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--white);
}

.page-item.disabled .page-link {
    color: var(--gray-400);
    pointer-events: none;
}

/* ============================================
   23. Empty States
   ============================================ */
.empty-state {
    text-align: center;
    padding: var(--spacing-3xl);
}

.empty-state-icon {
    font-size: 4rem;
    color: var(--gray-300);
    margin-bottom: var(--spacing-lg);
}

.empty-state-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.empty-state-text {
    color: var(--text-muted);
    max-width: 400px;
    margin: 0 auto;
}

/* ============================================
   24. 智能客服浮动窗口
   ============================================ */
.chat-widget {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.chat-toggle-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.chat-toggle-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.5);
}

.chat-toggle-btn:active {
    transform: scale(0.95);
}

.chat-toggle-btn .chat-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 22px;
    height: 22px;
    background: #ef4444;
    border-radius: 50%;
    font-size: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid white;
    animation: pulse-badge 2s infinite;
}

@keyframes pulse-badge {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(239, 68, 68, 0); }
}

.chat-window {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 380px;
    height: 560px;
    max-height: calc(100vh - 120px);
    background: white;
    border-radius: 16px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15), 0 4px 12px rgba(0, 0, 0, 0.08);
    display: none;
    flex-direction: column;
    overflow: hidden;
    animation: slideUpChat 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-window.open {
    display: flex;
}

@keyframes slideUpChat {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.chat-header {
    background: var(--gradient-primary);
    color: white;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.chat-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-header-icon {
    width: 42px;
    height: 42px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.chat-header-info h6 {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
}

.chat-header-info small {
    font-size: 12px;
    opacity: 0.85;
}

.chat-header-actions {
    display: flex;
    gap: 4px;
}

.chat-header-actions button {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: background 0.2s;
}

.chat-header-actions button:hover {
    background: rgba(255, 255, 255, 0.3);
}

.chat-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    background: #f8fafc;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-body::-webkit-scrollbar {
    width: 5px;
}

.chat-body::-webkit-scrollbar-track {
    background: transparent;
}

.chat-body::-webkit-scrollbar-thumb {
    background: #d1d5db;
    border-radius: 10px;
}

.chat-message {
    display: flex;
    gap: 8px;
    animation: msgIn 0.3s ease;
    max-width: 90%;
}

@keyframes msgIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chat-message.bot {
    align-self: flex-start;
}

.chat-message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.chat-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.chat-message.bot .chat-avatar {
    background: var(--primary-bg);
    color: var(--primary-color);
}

.chat-message.user .chat-avatar {
    background: var(--gray-200);
    color: var(--gray-600);
}

.chat-bubble {
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.6;
    word-break: break-word;
}

.chat-message.bot .chat-bubble {
    background: white;
    color: #1f2937;
    border-top-left-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.chat-message.user .chat-bubble {
    background: var(--primary-color);
    color: white;
    border-top-right-radius: 4px;
}

.chat-bubble .kb-source {
    font-size: 12px;
    color: #4c1d95;
    margin-bottom: 6px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--gray-100);
}

.chat-bubble .kb-content {
    font-size: 13px;
    color: #374151;
    line-height: 1.7;
}

.chat-bubble .kb-link {
    display: inline-block;
    margin-top: 8px;
    font-size: 13px;
    color: #4f46e5;
    text-decoration: none;
    font-weight: 600;
}

.chat-bubble .kb-link:hover {
    text-decoration: underline;
    color: #3730a3;
}

.chat-bubble a {
    color: #4f46e5;
}

.chat-bubble a:hover {
    color: #3730a3;
}

.chat-typing {
    align-self: flex-start;
    display: flex;
    gap: 4px;
    padding: 12px 16px;
    background: white;
    border-radius: 16px;
    border-top-left-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    animation: msgIn 0.3s ease;
}

.chat-typing span {
    width: 8px;
    height: 8px;
    background: var(--gray-400);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.chat-typing span:nth-child(2) { animation-delay: 0.2s; }
.chat-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-8px); opacity: 1; }
}

.chat-quick-questions {
    padding: 8px 16px;
    background: white;
    border-top: 1px solid var(--gray-100);
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    flex-shrink: 0;
}

.chat-quick-btn {
    font-size: 12px;
    padding: 5px 12px;
    border-radius: 20px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    color: var(--gray-600);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.chat-quick-btn:hover {
    background: var(--primary-bg);
    border-color: var(--primary-light);
    color: var(--primary-color);
}

.chat-footer {
    padding: 12px 16px;
    background: white;
    border-top: 1px solid var(--gray-100);
    flex-shrink: 0;
}

.chat-input-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.chat-input {
    flex: 1;
    border: 2px solid var(--gray-200);
    border-radius: 24px;
    padding: 10px 16px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
    resize: none;
    max-height: 100px;
}

.chat-input:focus {
    border-color: var(--primary-color);
}

.chat-send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.2s;
    flex-shrink: 0;
}

.chat-send-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.chat-send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.chat-transfer-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
}

.chat-transfer-btn {
    font-size: 12px;
    color: var(--gray-500);
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 12px;
    transition: all 0.2s;
}

.chat-transfer-btn:hover {
    background: var(--gray-50);
    color: var(--primary-color);
}

.chat-clear-btn {
    font-size: 12px;
    color: var(--gray-400);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 12px;
    transition: all 0.2s;
}

.chat-clear-btn:hover {
    background: var(--gray-50);
    color: var(--gray-600);
}

/* 转人工座席表单 */
.chat-transfer-form {
    padding: 12px 0;
}

.chat-transfer-form h6 {
    font-size: 14px;
    font-weight: 700;
    color: var(--gray-700);
    margin-bottom: 12px;
    text-align: center;
}

.chat-transfer-form .form-group {
    margin-bottom: 10px;
}

.chat-transfer-form label {
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-600);
    margin-bottom: 4px;
    display: block;
}

.chat-transfer-form input,
.chat-transfer-form textarea {
    width: 100%;
    border: 1px solid var(--gray-200);
    border-radius: 10px;
    padding: 8px 12px;
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s;
}

.chat-transfer-form input:focus,
.chat-transfer-form textarea:focus {
    border-color: var(--primary-color);
}

.chat-transfer-form textarea {
    resize: vertical;
    min-height: 60px;
}

.chat-transfer-form .btn-group {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.chat-transfer-form .btn-submit {
    flex: 1;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 10px;
    padding: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.chat-transfer-form .btn-submit:hover {
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.chat-transfer-form .btn-cancel {
    flex: 1;
    background: var(--gray-100);
    color: var(--gray-600);
    border: none;
    border-radius: 10px;
    padding: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.chat-transfer-form .btn-cancel:hover {
    background: var(--gray-200);
}

/* 响应式 */
@media (max-width: 480px) {
    .chat-window {
        width: calc(100vw - 32px);
        height: 500px;
        max-height: calc(100vh - 100px);
        right: -8px;
    }

    .chat-toggle-btn {
        width: 52px;
        height: 52px;
        font-size: 24px;
    }
}

/* ============================================
   25. 关于我们 Hero 插图
   ============================================ */
.about-hero {
    background: var(--gradient-primary);
    padding: 25px 0;
    margin-bottom: 0;
}

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

.thinker-illustration svg {
    width: 100%;
    max-width: 600px;
    height: auto;
}

.about-hero-img {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: 16px;
}

.hero-mission {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 12px;
    font-size: 1.15rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.75);
}

.hero-mission .mission-label {
    flex-shrink: 0;
    font-weight: 700;
    color: #fff;
    white-space: nowrap;
}

.hero-mission .mission-text {
    flex: 1;
}

@media (max-width: 991px) {
    .about-hero {
        padding: 40px 0;
    }

    .thinker-illustration {
        margin-top: 20px;
    }

    .thinker-illustration svg {
        max-width: 100%;
        max-height: 280px;
    }
}