/* ============================
   VARIABLES & RESET
   ============================ */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --dark: #1f2937;
    --light: #f9fafb;
    --gray: #6b7280;
    --border: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    --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);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: #ffffff;
}

/* ============================
   TYPOGRAPHY
   ============================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--gray);
}

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

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

/* ============================
   LAYOUT
   ============================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-2xl) 0;
}

/* ============================
   NAVIGATION
   ============================ */
.navbar {
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
}

.navbar-brand h1 {
    font-size: 1.5rem;
    margin: 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.navbar-menu a {
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
}

.navbar-menu a:hover {
    color: var(--primary);
}

/* ============================
   BUTTONS
   ============================ */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

/* ============================
   HERO SECTION
   ============================ */
.hero {
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    padding: var(--spacing-2xl) 0;
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content {
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

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

.hero-illustration {
    position: relative;
    height: 400px;
}

.floating-card {
    position: absolute;
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    animation: float 3s ease-in-out infinite;
}

.card-1 {
    top: 20px;
    left: 20px;
    animation-delay: 0s;
}

.card-2 {
    top: 120px;
    right: 40px;
    animation-delay: 0.5s;
}

.card-3 {
    bottom: 40px;
    left: 60px;
    animation-delay: 1s;
}

.feature-icon, .floating-card .icon {
    font-size: 2.5rem;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ============================
   FEATURES SECTION
   ============================ */
.features {
    background: white;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    font-size: 2.5rem;
}

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

.feature-card {
    padding: var(--spacing-xl);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    text-align: center;
}

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

.feature-card h3 {
    color: var(--dark);
    margin-bottom: var(--spacing-md);
}

.feature-card p {
    margin: 0;
    font-size: 0.95rem;
}

/* ============================
   ABOUT SECTION
   ============================ */
.about {
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
}

.about-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

.about-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.stat {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.stat h3 {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.stat p {
    margin: 0;
    color: var(--gray);
}

/* ============================
   CTA SECTION
   ============================ */
.cta {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

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

.cta p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
}

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

.cta .btn-primary:hover {
    background: rgba(255, 255, 255, 0.9);
}

/* ============================
   FOOTER
   ============================ */
.footer {
    background: var(--dark);
    color: white;
    padding: var(--spacing-xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer p {
    margin: 0;
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

/* ============================
   ERROR PAGE
   ============================ */
.error-page {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
}

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

.error-code {
    font-size: 6rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.error-content h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.error-content p {
    margin-bottom: var(--spacing-xl);
}

/* ============================
   RESPONSIVE DESIGN
   ============================ */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .navbar .container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .navbar-menu {
        flex-direction: column;
        gap: var(--spacing-md);
        width: 100%;
        text-align: center;
    }

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

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

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

    .hero-illustration {
        display: none;
    }

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

    .footer .container {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }

    .cta h2 {
        font-size: 1.75rem;
    }

    .cta p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

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

    .navbar-menu {
        gap: var(--spacing-sm);
    }

    .navbar-menu a {
        font-size: 0.9rem;
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .btn-large {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1rem;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.75rem;
    }
}