/* Design System Variables */
:root {
    /* Colors */
    --color-primary: #0f1321;
    --color-primary-light: rgba(15, 19, 33, 0.65);
    --color-primary-lighter: rgba(15, 19, 33, 0.35);
    --color-primary-lightest: rgba(15, 19, 33, 0.08);
    
    --color-accent: #d6ff66;
    --color-accent-light: #f2ffcd;
    --color-accent-dark: #77a80d;
    
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-900: #111827;
    --color-sky-100: #e0f2fe;
    
    --color-border: rgba(15, 19, 33, 0.08);
    --color-border-secondary: rgba(15, 19, 33, 0.14);
    
    /* Typography */
    --font-size-xs: 14px;
    --font-size-sm: 16px;
    --font-size-base: 18px;
    --font-size-lg: 20px;
    --font-size-xl: 30px;
    --font-size-2xl: 36px;
    --font-size-3xl: 60px;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    
    --line-height-tight: 20px;
    --line-height-normal: 24px;
    --line-height-relaxed: 28px;
    --line-height-loose: 30px;
    --line-height-xl: 38px;
    --line-height-2xl: 44px;
    --line-height-3xl: 72px;
    
    /* Spacing */
    --spacing-0: 0;
    --spacing-1: 4px;
    --spacing-2: 8px;
    --spacing-3: 12px;
    --spacing-4: 16px;
    --spacing-5: 20px;
    --spacing-6: 24px;
    --spacing-8: 32px;
    --spacing-10: 40px;
    --spacing-12: 48px;
    --spacing-16: 64px;
    --spacing-20: 80px;
    
    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 10px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    
    /* Shadows */
    --shadow-sm: 0px 1px 2px 0px rgba(18, 26, 43, 0.05);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    
    /* Layout */
    --container-max-width: 1280px;
    --container-padding: var(--spacing-8);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
    color: var(--color-primary);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Common Section Styles */
.section {
    padding: var(--spacing-16) 0;
    background-color: var(--color-white);
}

.section-alt {
    padding: var(--spacing-16) 0;
    background-color: var(--color-gray-50);
}

/* Typography */
.section-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-2xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-4);
}

.section-subtitle {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-relaxed);
    color: var(--color-primary-light);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2) var(--spacing-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: #c4f055;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--color-gray-900);
    color: var(--color-white);
}

.btn-secondary:hover {
    background-color: #1f2937;
    transform: translateY(-1px);
}

.btn-full {
    width: 100%;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    :root {
        --container-padding: var(--spacing-4);
    }

    .section {
        padding: var(--spacing-12) 0;
        background-color: var(--color-white);
    }

    .section-title {
        font-size: var(--font-size-xl);
        line-height: var(--line-height-xl);
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Mobile scroll padding adjustment */
@media (max-width: 768px) {
    html {
        scroll-padding-top: 70px;
    }
}