/* =========================
   CSS Variables
   ========================= */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #0ea5e9;
    --accent: #22d3ee;
    --dark: #0f172a;
    --dark-lighter: #1e293b;
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
    --gradient-text: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 100%);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 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);
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s ease;
}

/* =========================
   Reset & Base
   ========================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--dark);
    color: var(--gray-300);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* =========================
   Container
   ========================= */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =========================
   Buttons
   ========================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--gray-300);
    border: 1px solid var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-800);
    border-color: var(--gray-600);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
    border-radius: var(--radius-lg);
}

/* =========================
   Navbar
   ========================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.15);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.02);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
}

.logo-img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    color: var(--white);
}

.logo-ai {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--gray-400);
    font-weight: 500;
    font-size: 14px;
}

.nav-links a:hover {
    color: var(--white);
}

/* =========================
   Hero Section
   ========================= */
.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh; /* dynamic viewport height для мобильных */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(14, 165, 233, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse 40% 30% at 20% 80%, rgba(34, 211, 238, 0.15) 0%, transparent 50%);
}

.hero-particles {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.4) 1px, transparent 1px),
        radial-gradient(circle at 80% 70%, rgba(14, 165, 233, 0.4) 1px, transparent 1px),
        radial-gradient(circle at 40% 80%, rgba(34, 211, 238, 0.3) 1px, transparent 1px);
    background-size: 100px 100px, 150px 150px, 200px 200px;
    animation: particles 20s linear infinite;
}

@keyframes particles {
    0% { transform: translateY(0); }
    100% { transform: translateY(-100px); }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-light);
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(40px, 6vw, 72px);
    font-weight: 800;
    color: var(--white);
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--gray-400);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 64px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
    padding-top: 48px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--white);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-500);
}

/* =========================
   Section Styles
   ========================= */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 64px;
}

.section-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 16px;
    color: var(--gray-400);
}

/* =========================
   Features Section
   ========================= */
.features {
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark-lighter) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.feature-card {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

.feature-card:hover {
    background: rgba(30, 41, 59, 0.8);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon svg {
    stroke: var(--white);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    color: var(--gray-400);
    line-height: 1.6;
}

/* =========================
   How it Works Section
   ========================= */
.how-it-works {
    background: var(--dark-lighter);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 32px;
    max-width: 700px;
    margin: 0 auto;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    padding: 32px;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.step:hover {
    border-color: rgba(99, 102, 241, 0.3);
}

.step-number {
    font-size: 48px;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.step-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 8px;
}

.step-content p {
    font-size: 15px;
    color: var(--gray-400);
}

/* =========================
   CTA Section
   ========================= */
.cta {
    background: var(--dark);
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 60% 50% at 50% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
}

.cta-content {
    position: relative;
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.cta h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.cta p {
    font-size: 16px;
    color: var(--gray-400);
    margin-bottom: 32px;
}

.cta-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group input {
    width: 100%;
    padding: 16px 20px;
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    color: var(--white);
    font-size: 15px;
    transition: var(--transition);
}

.form-group input::placeholder {
    color: var(--gray-500);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.cta-form .btn {
    width: 100%;
}

/* =========================
   Contact Section
   ========================= */
.contact {
    background: var(--dark-lighter);
}

.contact-grid {
    max-width: 600px;
    margin: 0 auto;
}

.contact-info h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.contact-info > p {
    font-size: 16px;
    color: var(--gray-400);
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--gray-300);
}

.contact-item svg {
    stroke: var(--primary-light);
    flex-shrink: 0;
}

/* =========================
   Footer
   ========================= */
.footer {
    background: var(--gray-900);
    padding: 24px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-brand p {
    color: var(--gray-500);
    font-size: 14px;
    margin-top: 8px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links h4 {
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--gray-500);
    font-size: 14px;
}

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

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

.footer-bottom p {
    color: var(--gray-600);
    font-size: 14px;
}

/* =========================
   Responsive
   ========================= */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================
   Solutions Section (АГНКС)
   ========================= */
.solutions {
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark-lighter) 100%);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 1024px) {
    .solutions-grid {
        grid-template-columns: 1fr;
    }
}

.solution-card {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    padding: 32px;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
}

.solution-card:hover {
    background: rgba(30, 41, 59, 0.8);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.solution-card.featured {
    background: rgba(99, 102, 241, 0.1);
    border-color: rgba(99, 102, 241, 0.3);
}

.solution-card.featured:hover {
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.2);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient);
    color: white;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 6px 16px;
    border-radius: 100px;
}

.solution-icon {
    width: 72px;
    height: 72px;
    background: rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.solution-icon svg {
    stroke: var(--primary-light);
}

.solution-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.solution-subtitle {
    font-size: 14px;
    color: var(--primary-light);
    font-weight: 500;
    margin-bottom: 20px;
}

.solution-features {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
    flex-grow: 1;
}

.solution-features li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 0;
    font-size: 14px;
    color: var(--gray-300);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.solution-features li:last-child {
    border-bottom: none;
}

.solution-features li svg {
    flex-shrink: 0;
    margin-top: 2px;
    stroke: var(--accent);
}

.solution-benefit {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    background: rgba(34, 211, 238, 0.1);
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: var(--radius);
    margin-top: auto;
}

.solution-benefit .benefit-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.solution-benefit .benefit-icon svg {
    stroke: var(--accent);
}

.solution-benefit span:last-child {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
}

/* =========================
   Benefits Section
   ========================= */
.benefits {
    background: var(--dark);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

@media (max-width: 1024px) {
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.benefit-card {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

.benefit-card:hover {
    background: rgba(30, 41, 59, 0.7);
    border-color: rgba(99, 102, 241, 0.2);
    transform: translateY(-4px);
}

.benefit-icon-large {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    margin: 0 auto 16px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-lg);
}

.benefit-icon-large svg {
    stroke: var(--primary-light);
}

.benefit-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 12px;
}

.benefit-card p {
    font-size: 14px;
    color: var(--gray-400);
    line-height: 1.6;
}

/* Hero Stats - Icon variant */
.hero-stats .stat-icon {
    font-size: 32px;
    margin-bottom: 8px;
    display: block;
}

/* Footer simple variant */
.footer-simple {
    display: flex;
    justify-content: center;
    text-align: center;
}

.footer-simple .footer-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
}