/* ===========================
   NPAI Landing Site - Main Styles
   =========================== */

:root {
    /* Colors */
    --primary-color: #1a5490;
    --secondary-color: #2d7fc4;
    --accent-color: #d97706;
    --success-color: #16a34a;
    --danger-color: #dc2626;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --gray-color: #64748b;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1a5490 0%, #2d7fc4 100%);
    --gradient-secondary: linear-gradient(135deg, #d97706 0%, #f59e0b 100%);
    --gradient-success: linear-gradient(135deg, #16a34a 0%, #22c55e 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===========================
   Global Styles
   =========================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===========================
   Navigation
   =========================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-brand i {
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    transition: color var(--transition-base);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.nav-menu a:hover {
    color: var(--primary-color);
    background-color: rgba(26, 84, 144, 0.1);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
}

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) 0;
    overflow: hidden;
    background: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(26, 84, 144, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(45, 127, 196, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(217, 119, 6, 0.2) 0%, transparent 50%);
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.hero-content {
    position: relative;
    text-align: center;
    color: white;
    z-index: 1;
}

.hero-title {
    font-size: 5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 1s ease;
}

.gradient-text {
    background: linear-gradient(135deg, #60a5fa, #3b82f6, #2563eb);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.9);
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.8);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1s ease 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1s ease 0.6s both;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-top: var(--spacing-xl);
    animation: fadeInUp 1s ease 0.8s both;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: #60a5fa;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

/* Стили для ссылок-кнопок */
a.btn {
    text-decoration: none;
    color: inherit;
}

a.btn:hover {
    text-decoration: none;
    color: inherit;
}

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

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

.btn-secondary {
    background: var(--gradient-secondary);
    color: white;
    box-shadow: var(--shadow-lg);
}

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

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

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

.btn-lg {
    padding: 1.25rem 3rem;
    font-size: 1.125rem;
}

.btn-details {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.5rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-details:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(5px);
}

/* ===========================
   Section Headers
   =========================== */

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark-color);
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 1.2rem;
    color: var(--gray-color);
    max-width: 600px;
    margin: 0 auto;
}

/* ===========================
   Problem & Solution Section
   =========================== */

.problem-solution {
    padding: var(--spacing-xl) 0;
    background: white;
}

.ps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.ps-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.ps-card.problem {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border-left: 5px solid var(--danger-color);
}

.ps-card.solution {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    border-left: 5px solid var(--success-color);
}

.ps-card h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.ps-card ul {
    list-style: none;
}

.ps-card li {
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: 1.05rem;
}

.ps-card li i {
    margin-top: 0.25rem;
    font-size: 1.2rem;
}

.ps-card.problem li i {
    color: var(--danger-color);
}

.ps-card.solution li i {
    color: var(--success-color);
}

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

.modules {
    padding: var(--spacing-xl) 0;
    background: var(--light-color);
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.module-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border-top: 4px solid var(--primary-color);
}

.module-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.module-icon {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    margin-bottom: var(--spacing-md);
}

.module-icon.eco { background: var(--gradient-success); }
.module-icon.analytics { background: var(--gradient-primary); }
.module-icon.vision { background: linear-gradient(135deg, #8b5cf6 0%, #a78bfa 100%); }
.module-icon.acoustic { background: linear-gradient(135deg, #ec4899 0%, #f472b6 100%); }
.module-icon.safety { background: linear-gradient(135deg, #ef4444 0%, #f87171 100%); }
.module-icon.smartgrid { background: linear-gradient(135deg, #eab308 0%, #facc15 100%); }
.module-icon.knowledge { background: linear-gradient(135deg, #06b6d4 0%, #22d3ee 100%); }
.module-icon.thermal { background: linear-gradient(135deg, #f97316 0%, #fb923c 100%); }
.module-icon.marketplace { background: linear-gradient(135deg, #14b8a6 0%, #2dd4bf 100%); }
.module-icon.offline { background: linear-gradient(135deg, #6366f1 0%, #818cf8 100%); }

.module-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: var(--spacing-xs);
}

.module-subtitle {
    color: var(--gray-color);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.module-card > p {
    color: var(--gray-color);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.module-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.module-features li {
    padding: var(--spacing-xs) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--dark-color);
    font-size: 0.95rem;
}

.module-features li i {
    color: var(--primary-color);
    font-size: 1rem;
}

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

.features {
    padding: var(--spacing-xl) 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--light-color);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--dark-color);
}

.feature-card p {
    color: var(--gray-color);
    line-height: 1.7;
}

/* ===========================
   Pricing Section
   =========================== */

.pricing {
    padding: var(--spacing-xl) 0;
    background: var(--light-color);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.pricing-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.popular {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(26, 84, 144, 0.1);
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 700;
    color: white;
    text-transform: uppercase;
}

.pricing-badge.free { background: var(--success-color); }
.pricing-badge.pro { background: var(--primary-color); }
.pricing-badge.business { background: var(--accent-color); }
.pricing-badge.enterprise { background: var(--dark-color); }

.pricing-card h3 {
    font-size: 1.8rem;
    font-weight: 700;
    text-align: center;
    margin: var(--spacing-md) 0;
    color: var(--dark-color);
}

.pricing-price {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.pricing-price .price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
}

.pricing-price .period {
    color: var(--gray-color);
    font-size: 1rem;
}

.pricing-description {
    text-align: center;
    color: var(--gray-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid #e2e8f0;
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--dark-color);
}

.pricing-features li i.fa-check {
    color: var(--success-color);
}

.pricing-features li i.fa-times {
    color: var(--gray-color);
}

.pricing-card .btn {
    width: 100%;
    justify-content: center;
}

/* ===========================
   Documentation Section
   =========================== */

.documentation {
    padding: var(--spacing-xl) 0;
    background: white;
}

.doc-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.doc-content {
    background: var(--light-color);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-height: 800px;
    overflow-y: auto;
}

.doc-loader {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--gray-color);
    font-size: 1.2rem;
}

.doc-loader i {
    margin-right: var(--spacing-sm);
}

/* ===========================
   License Section
   =========================== */

.license-section {
    background: var(--light-color);
    padding: var(--spacing-xl) 0;
}

.license-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.license-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border-left: 4px solid var(--primary-color);
}

.license-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.license-card.warning {
    border-left-color: var(--danger-color);
    background: linear-gradient(135deg, #fef2f2 0%, #ffffff 100%);
}

.license-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
    color: white;
}

.license-card.warning .license-icon {
    background: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
}

.license-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.license-card.warning h3 {
    color: var(--danger-color);
}

.license-card p {
    color: var(--gray-color);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.license-card ul {
    list-style: none;
    padding: 0;
    margin: var(--spacing-sm) 0;
}

.license-card ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-color);
    line-height: 1.6;
}

.license-card ul li:before {
    content: "✗";
    position: absolute;
    left: 0;
    color: var(--danger-color);
    font-weight: bold;
}

.license-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-base);
}

.license-card a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

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

.cta {
    padding: var(--spacing-xl) 0;
    background: var(--gradient-primary);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.cta p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

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

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

/* ===========================
   Footer
   =========================== */

.footer {
    background: var(--dark-color);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-col h4 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: #60a5fa;
}

.footer-col p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.footer-col ul {
    list-style: none;
}

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

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-col ul li a:hover {
    color: #60a5fa;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: #60a5fa;
    transform: translateY(-3px);
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
}

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

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    position: relative;
    background-color: white;
    margin: 5% auto;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
}

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

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 2rem;
    font-weight: bold;
    color: var(--gray-color);
    cursor: pointer;
    transition: color var(--transition-base);
}

.modal-close:hover {
    color: var(--danger-color);
}

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

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .section-header p {
        font-size: 1rem;
    }
    
    .ps-grid {
        grid-template-columns: 1fr;
    }
    
    .modules-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .license-content {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .btn-lg {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}

/* ===========================
   Modal Styles (Detailed)
   =========================== */

.modal-description {
    font-size: 1.1rem;
    color: var(--gray-color);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid #e2e8f0;
}

.modal-features {
    margin-bottom: var(--spacing-lg);
}

.modal-features h3,
.modal-tech h3,
.modal-value h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.feature-section {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--light-color);
    border-radius: var(--radius-md);
}

.feature-section h4 {
    font-size: 1.1rem;
    color: var(--dark-color);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.feature-section h4 i {
    color: var(--success-color);
}

.feature-section ul {
    list-style: none;
    padding-left: 0;
}

.feature-section ul li {
    padding: 0.375rem 0;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    color: var(--gray-color);
}

.feature-section ul li i {
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.modal-tech,
.modal-value {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: #eff6ff;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.modal-tech p,
.modal-value p {
    color: var(--dark-color);
    line-height: 1.7;
    margin: 0;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid #e2e8f0;
}

.modal-actions .btn {
    flex: 1;
    justify-content: center;
}

.doc-text {
    line-height: 1.8;
    color: var(--dark-color);
}

.doc-text h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.doc-text h2 {
    font-size: 1.6rem;
    color: var(--secondary-color);
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.doc-text h3 {
    font-size: 1.3rem;
    color: var(--dark-color);
    margin: var(--spacing-sm) 0;
}

.doc-text p {
    margin-bottom: var(--spacing-md);
}

.doc-text ul {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.doc-text hr {
    border: none;
    border-top: 2px solid #e2e8f0;
    margin: var(--spacing-lg) 0;
}

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

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

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }