/* ===================================
   NEXUS AI Consultation System Styles
   Version: 10.6
   =================================== */

/* CSS Variables */
:root {
    /* Primary Colors */
    --primary-blue: #2563EB;
    --primary-blue-dark: #1D4ED8;
    --primary-purple: #8B5CF6;
    --primary-purple-dark: #7C3AED;
    
    /* Secondary Colors */
    --success-green: #10B981;
    --success-green-dark: #059669;
    --warning-orange: #F59E0B;
    --warning-orange-dark: #D97706;
    --info-cyan: #06B6D4;
    
    /* Gradients */
    --gradient-blue: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
    --gradient-purple: linear-gradient(135deg, #8B5CF6 0%, #7C3AED 100%);
    --gradient-green: linear-gradient(135deg, #10B981 0%, #059669 100%);
    --gradient-orange: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
    --gradient-blue-purple: linear-gradient(135deg, #2563EB 0%, #8B5CF6 100%);
    
    /* Neutral Colors */
    --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;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===================================
   Hero Section
   =================================== */

.ai-hero {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #8b5cf6 100%);
    padding: 100px 40px 80px;
    position: relative;
    overflow: hidden;
}

.ai-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.3;
}

.ai-hero-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.ai-hero-text {
    flex: 1;
    color: white;
}

.ai-hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.ai-hero-subtitle {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.95;
    line-height: 1.6;
}

.ai-hero-image {
    flex: 0 0 auto;
    width: 320px;
}

.ai-hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.btn-hero {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: white;
    color: var(--primary-blue);
    padding: 16px 40px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.3);
}

.btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 255, 255, 0.4);
}

/* ===================================
   Statistics Cards
   =================================== */

.stats-section {
    padding: 60px 40px;
    background: var(--gray-50);
}

.stats-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-card {
    background: var(--gradient-blue);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    color: white;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    pointer-events: none;
}

.stat-card.blue {
    background: var(--gradient-blue);
}

.stat-card.green {
    background: var(--gradient-green);
}

.stat-card.purple {
    background: var(--gradient-purple);
}

.stat-card.orange {
    background: var(--gradient-orange);
}

.stat-icon {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 40px;
    opacity: 0.3;
}

.stat-label {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
    margin-bottom: 10px;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    margin: 10px 0;
    line-height: 1;
}

.stat-description {
    font-size: 14px;
    opacity: 0.85;
    margin-top: 8px;
}

/* ===================================
   Service Modules Section
   =================================== */

.services-section {
    padding: 80px 40px;
    background: white;
}

.services-container {
    max-width: 1400px;
    margin: 0 auto;
}

.service-category {
    margin-bottom: 60px;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
}

.category-icon {
    font-size: 32px;
}

.category-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
}

.category-count {
    background: var(--gray-200);
    color: var(--gray-700);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.service-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.service-card {
    background: white;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 30px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: var(--gradient-blue-purple);
    transition: height var(--transition-normal);
}

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

.service-card:hover::before {
    height: 100%;
}

.card-header {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 20px;
}

.card-icon {
    flex: 0 0 auto;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: var(--gradient-blue-purple);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    transition: transform var(--transition-normal);
}

.service-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
}

.card-title-section {
    flex: 1;
}

.card-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 5px;
}

.card-title-zh {
    font-size: 16px;
    color: var(--gray-600);
    font-weight: 500;
}

.card-status {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.card-status.available {
    background: #D1FAE5;
    color: #065F46;
}

.card-status.coming-soon {
    background: #FEF3C7;
    color: #92400E;
}

.card-content {
    margin-bottom: 25px;
}

.card-description {
    color: var(--gray-700);
    line-height: 1.6;
    margin-bottom: 10px;
}

.card-description-zh {
    color: var(--gray-600);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.card-features {
    margin-top: 20px;
}

.features-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 12px;
}

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.feature-tag {
    background: var(--gray-100);
    color: var(--gray-700);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.feature-tag:hover {
    background: var(--primary-blue);
    color: white;
}

.card-actions {
    display: flex;
    gap: 12px;
}

.btn-primary {
    flex: 1;
    background: var(--gradient-blue-purple);
    color: white;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    border: none;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
    flex: 0 0 auto;
    background: white;
    color: var(--primary-blue);
    padding: 14px 24px;
    border-radius: var(--radius-md);
    border: 2px solid var(--primary-blue);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

/* ===================================
   System Features Section
   =================================== */

.features-section {
    padding: 80px 40px;
    background: var(--gray-50);
}

.features-container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--gray-600);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.feature-icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    transition: transform var(--transition-normal);
}

.feature-card:hover .feature-icon-wrapper {
    transform: scale(1.1);
}

.feature-card:nth-child(1) .feature-icon-wrapper {
    background: linear-gradient(135deg, #DBEAFE, #BFDBFE);
}

.feature-card:nth-child(2) .feature-icon-wrapper {
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
}

.feature-card:nth-child(3) .feature-icon-wrapper {
    background: linear-gradient(135deg, #D1FAE5, #A7F3D0);
}

.feature-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 10px;
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===================================
   CTA Section
   =================================== */

.cta-section {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    padding: 80px 40px;
    text-align: center;
    color: white;
}

.cta-container {
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: white;
    color: var(--primary-blue);
    padding: 18px 50px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.3);
}

.btn-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 255, 255, 0.4);
}

.cta-note {
    margin-top: 20px;
    font-size: 14px;
    opacity: 0.8;
}

/* ===================================
   Modal
   =================================== */

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: var(--radius-xl);
    max-width: 700px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 50px 40px;
    position: relative;
    animation: slideUp 0.4s ease;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--gray-100);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-200);
    transform: rotate(90deg);
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.modal-icon {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-md);
    background: var(--gradient-blue-purple);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.modal-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 5px;
}

.modal-title-zh {
    font-size: 18px;
    color: var(--gray-600);
}

.modal-body {
    margin-bottom: 30px;
}

.modal-description {
    color: var(--gray-700);
    line-height: 1.8;
    margin-bottom: 15px;
}

.modal-features {
    margin-top: 30px;
}

.modal-features-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.modal-features-list {
    display: grid;
    gap: 15px;
}

.modal-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 15px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
}

.modal-feature-icon {
    flex: 0 0 auto;
    width: 24px;
    height: 24px;
    background: var(--gradient-blue-purple);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
}

.modal-feature-text {
    flex: 1;
    color: var(--gray-700);
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: 15px;
}

/* ===================================
   Animations
   =================================== */

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

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

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }
.service-card:nth-child(4) { animation-delay: 0.4s; }

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1200px) {
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ai-hero-title {
        font-size: 40px;
    }
}

@media (max-width: 768px) {
    .ai-hero {
        padding: 60px 20px 40px;
    }
    
    .ai-hero-content {
        flex-direction: column-reverse;
        gap: 40px;
    }
    
    .ai-hero-image {
        width: 250px;
    }
    
    .ai-hero-title {
        font-size: 32px;
    }
    
    .ai-hero-subtitle {
        font-size: 16px;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 0 20px;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .services-section {
        padding: 40px 20px;
    }
    
    .service-cards {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .card-actions {
        flex-direction: column;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .cta-title {
        font-size: 28px;
    }
    
    .cta-subtitle {
        font-size: 16px;
    }
    
    .modal-content {
        padding: 40px 24px;
    }
}

/* ===================================
   Utility Classes
   =================================== */

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

.mb-20 {
    margin-bottom: 20px;
}

.mb-30 {
    margin-bottom: 30px;
}

.mt-20 {
    margin-top: 20px;
}

.hidden {
    display: none;
}