:root {
    --primary-900: #0c1e3d;
    --primary-800: #0f2847;
    --primary-700: #1e3a5f;
    --primary-600: #1e40af;
    --primary-500: #3b82f6;
    --primary-400: #60a5fa;
    --primary-300: #93c5fd;

    --bg-primary: #0a1628;
    --bg-secondary: #0f1e35;
    --bg-tertiary: #1a2942;
    --bg-card: #0f2440;
    --bg-card-hover: #1a3254;

    --text-primary: #e8eef7;
    --text-secondary: #a8b8d8;
    --text-tertiary: #7a8fb8;

    --accent-success: #10b981;

    --border-color: #1e3a5f;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.3);

    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    --gradient-secondary: linear-gradient(135deg, #1e40af 0%, #0c1e3d 100%);
    --gradient-hero: linear-gradient(180deg, #0a1628 0%, #0f2440 100%);

    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;

    --container-width: 1200px;
    --section-padding: 100px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

a {
    color: var(--primary-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-300);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 22, 40, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(10, 22, 40, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 36px;
    height: 36px;
}

.logo-text {
    display: flex;
    align-items: baseline;
}

.logo-text-highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    font-size: 22px;
}

.logo-text-normal {
    font-weight: 500;
    color: var(--text-secondary);
}

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

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    transform: scaleX(1);
}

.nav-link-cta {
    padding: 8px 20px;
    background: var(--gradient-primary);
    border-radius: 8px;
    color: white;
}

.nav-link-cta::after {
    display: none;
}

.nav-link-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

.hero {
    position: relative;
    padding: 150px 0 100px;
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero-background {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(30, 64, 175, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(59, 130, 246, 0.2);
    border: 1px solid var(--primary-500);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-300);
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.1;
}

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

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px 0 rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-300);
    border: 1px solid var(--primary-500);
}

.btn-secondary:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--primary-400);
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat {
    text-align: left;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-mockup {
    position: relative;
    width: 100%;
    max-width: 500px;
}

.mockup-window {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.mockup-titlebar {
    background: var(--bg-tertiary);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.mockup-buttons {
    display: flex;
    gap: 6px;
}

.mockup-buttons span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border-color);
}

.mockup-buttons span:nth-child(1) {
    background: #ef4444;
}

.mockup-buttons span:nth-child(2) {
    background: #f59e0b;
}

.mockup-buttons span:nth-child(3) {
    background: #10b981;
}

.mockup-title {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.mockup-content {
    padding: 32px;
}

.mockup-status {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    font-size: 15px;
    font-weight: 600;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-success);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    50% {
        opacity: 0.8;
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
    }
}

.mockup-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.metric {
    background: rgba(59, 130, 246, 0.1);
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--primary-700);
}

.metric-label {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 4px;
}

.metric-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-300);
}

section {
    padding: var(--section-padding) 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 16px;
}

.section-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features {
    background: var(--bg-secondary);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-600);
    box-shadow: var(--shadow-lg);
    background: var(--bg-card-hover);
}

.feature-icon {
    width: 48px;
    height: 48px;
    padding: 12px;
    background: var(--gradient-primary);
    border-radius: 12px;
    margin-bottom: 20px;
    color: white;
}

.feature-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.how-it-works {
    background: var(--bg-primary);
}

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

.step {
    display: flex;
    gap: 32px;
    margin-bottom: 48px;
    position: relative;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 30px;
    top: 70px;
    bottom: -48px;
    width: 2px;
    background: var(--gradient-primary);
    opacity: 0.3;
}

.step-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    color: white;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.4);
}

.step-content {
    flex: 1;
    padding-top: 8px;
}

.step-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
}

.step-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.requirements {
    background: var(--bg-secondary);
    position: relative;
}

.requirements::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 48px;
}

.requirement-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
}

.requirement-icon {
    width: 48px;
    height: 48px;
    padding: 12px;
    background: rgba(59, 130, 246, 0.2);
    border-radius: 12px;
    margin-bottom: 20px;
    color: var(--primary-400);
}

.requirement-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.requirement-list {
    list-style: none;
}

.requirement-list li {
    font-size: 15px;
    color: var(--text-secondary);
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
}

.requirement-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-500);
    border-radius: 50%;
}

.requirements-note {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--primary-700);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    gap: 16px;
    align-items: start;
}

.requirements-note svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    color: var(--primary-400);
    margin-top: 2px;
}

.requirements-note p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    background: var(--bg-card);
    transition: all var(--transition-normal);
}

.faq-item:hover {
    border-color: var(--primary-600);
}

.faq-question {
    width: 100%;
    padding: 24px;
    background: none;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--primary-300);
}

.faq-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    color: var(--primary-400);
    transition: transform var(--transition-normal);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 24px 24px;
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-answer a {
    color: var(--primary-400);
    text-decoration: underline;
}

.download {
    background: var(--bg-secondary);
    position: relative;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.download-card {
    background: var(--gradient-secondary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 64px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 64px;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 80% 50%, rgba(59, 130, 246, 0.2) 0%, transparent 50%);
    pointer-events: none;
}

.download-content {
    position: relative;
    z-index: 1;
}

.download-title {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
}

.download-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.download-info {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
}

.download-detail {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    color: var(--text-secondary);
}

.download-detail svg {
    width: 20px;
    height: 20px;
    color: var(--primary-400);
}

.btn-download {
    width: 100%;
    justify-content: center;
    margin-bottom: 16px;
}

.download-note {
    font-size: 13px;
    color: var(--text-tertiary);
    text-align: center;
}

.download-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.download-illustration svg {
    width: 280px;
    height: 280px;
}

.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 64px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 350px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo-text {
    font-size: 20px;
    font-weight: 700;
    display: flex;
    align-items: baseline;
}

.footer-description {
    font-size: 15px;
    color: var(--text-tertiary);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

.footer-heading {
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

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

.footer-list li {
    margin-bottom: 12px;
}

.footer-list a {
    font-size: 15px;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

.footer-list a:hover {
    color: var(--primary-400);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.footer-copyright {
    font-size: 14px;
    color: var(--text-tertiary);
}

.footer-social {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--gradient-primary);
    border-color: var(--primary-500);
    color: white;
    transform: translateY(-2px);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-visual {
        order: -1;
    }

    .hero-title {
        font-size: 42px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .requirements-grid {
        grid-template-columns: 1fr;
    }

    .download-card {
        grid-template-columns: 1fr;
        gap: 48px;
        padding: 48px;
    }

    .download-visual {
        display: none;
    }

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

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-normal);
        pointer-events: none;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-description {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-stats {
        gap: 32px;
    }

    .section-title {
        font-size: 32px;
    }

    .section-description {
        font-size: 16px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .step {
        gap: 20px;
    }

    .step-number {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }

    .step:not(:last-child)::after {
        left: 25px;
        top: 60px;
    }

    .download-card {
        padding: 32px;
    }

    .download-title {
        font-size: 28px;
    }

    .download-info {
        flex-direction: column;
        gap: 16px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 26px;
    }

    .stat-value {
        font-size: 24px;
    }

    .download-card {
        padding: 24px;
    }
}