/* ==========================================================================
   Design System & Variables (Matched with style.css)
   ========================================================================== */
:root {
    /* Color Palette - Premium Dark Glassmorphism */
    --primary-hue: 220;
    --primary-sat: 90%;
    --primary-light: 60%;

    --color-bg-base: #0f172a;
    --color-bg-gradient-start: #0f172a;
    --color-bg-gradient-end: #1e293b;

    --color-primary: hsl(var(--primary-hue), var(--primary-sat), var(--primary-light));
    --color-primary-hover: hsl(var(--primary-hue), var(--primary-sat), 70%);
    --color-secondary: #ec4899;
    /* Pink accent */
    --color-accent: #8b5cf6;
    /* Purple accent */

    --color-text-main: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-text-inverse: #0f172a;

    /* Glassmorphism */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --glass-blur: 12px;

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

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

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

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--color-bg-base);
    background-image:
        radial-gradient(circle at 15% 50%, rgba(76, 29, 149, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(14, 165, 233, 0.15) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--color-text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 90vh;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 600px;
    padding: var(--spacing-xl);
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
    background: linear-gradient(135deg, var(--color-text-main) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.hero-content p {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-muted);
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.btn-primary {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 15px rgba(var(--primary-hue), 90%, 60%, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(var(--primary-hue), 90%, 60%, 0.4);
    background: var(--color-primary-hover);
}

.btn-primary.large {
    padding: 18px 40px;
    font-size: 1.2rem;
}

.btn-secondary {
    display: inline-block;
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-main);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: var(--color-primary);
}

.hero-illustration {
    position: relative;
    z-index: 2;
    padding: var(--spacing-xl);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }

    100% {
        transform: translateY(0px);
    }
}

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

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
}

.section-header p {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto;
}

.divider {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    margin: var(--spacing-md) auto;
    border-radius: var(--radius-full);
}

/* ==========================================================================
   Overview Section
   ========================================================================== */
.overview-section {
    background: rgba(0, 0, 0, 0.2);
}

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

.overview-content p {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--color-text-main);
    margin-bottom: 60px;
    opacity: 0.9;
}

.stats-container {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(var(--glass-blur));
    transition: all var(--transition-normal);
    min-width: 200px;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border-color: var(--color-primary);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-text-main) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Features Section
   ========================================================================== */
.features-section {
    position: relative;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 40px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
    backdrop-filter: blur(var(--glass-blur));
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-color: var(--color-primary);
}

.feature-icon {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
    background: var(--color-primary);
    transform: scale(1.1);
}

.feature-card:hover .feature-icon svg path,
.feature-card:hover .feature-icon svg circle {
    stroke: var(--color-text-inverse);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--color-text-main);
}

.feature-card p {
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ==========================================================================
   Science Section
   ========================================================================== */
.science-section {
    background: rgba(0, 0, 0, 0.2);
}

.science-content {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.science-item {
    display: flex;
    align-items: center;
    gap: 60px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 40px;
    border-radius: var(--radius-lg);
    backdrop-filter: blur(var(--glass-blur));
}

.science-icon {
    flex-shrink: 0;
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.science-text {
    flex: 1;
}

.science-text h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--color-text-main);
}

.science-text p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Usage Section
   ========================================================================== */
.usage-section {
    position: relative;
}

.usage-steps {
    display: flex;
    flex-direction: column;
    gap: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.step-item {
    display: flex;
    gap: 30px;
    align-items: flex-start;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 30px;
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast);
}

.step-item:hover {
    transform: translateX(10px);
    border-color: var(--color-primary);
}

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    font-weight: 700;
    box-shadow: 0 5px 15px rgba(var(--primary-hue), 90%, 60%, 0.3);
}

.step-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--color-text-main);
}

.step-content p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ==========================================================================
   CTA Section
   ========================================================================== */
.cta-section {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(180deg, transparent 0%, rgba(var(--primary-hue), 90%, 60%, 0.1) 100%);
}

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

.cta-content h2 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--color-text-main);
}

.cta-content p {
    font-size: 1.3rem;
    margin-bottom: 40px;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer-section {
    background: rgba(0, 0, 0, 0.4);
    border-top: 1px solid var(--glass-border);
    padding: 60px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-logo h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--color-text-main);
}

.footer-logo p {
    color: var(--color-text-muted);
    margin-bottom: 30px;
}

.footer-links {
    display: flex;
    gap: 30px;
    margin-bottom: 30px;
}

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-license p {
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 992px) {
    .hero-section {
        flex-direction: column;
        text-align: center;
        padding-top: 120px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .science-item {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    section {
        padding: 60px 0;
    }

    .step-item {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }

    .step-number {
        margin: 0 auto;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2rem;
    }

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

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