/**
 * Exun - Minimalistic Design System
 * Inspired by Chris Do / The Futur aesthetic
 */

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - Minimal, Professional */
    --color-primary: #1a1a1a;
    --color-secondary: #4a4a4a;
    --color-accent: #d97706;
    --color-text: #2d2d2d;
    --color-text-light: #6b6b6b;
    --color-bg: #ffffff;
    --color-bg-light: #fafafa;
    --color-border: #e5e5e5;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Merriweather', Georgia, serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Layout */
    --container-width: 1200px;
    --container-padding: 1.5rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    line-height: 1.6;
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-size: 1.125rem;
    line-height: 1.8;
}

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

a:hover {
    color: var(--color-accent);
}

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

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

.section-sm {
    padding: var(--spacing-lg) 0;
}

/* ===== HEADER ===== */
.header {
    position: sticky;
    top: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.logo:hover {
    color: var(--color-primary);
}

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

.nav-menu a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    text-align: center;
    border: 2px solid transparent;
    border-radius: 0;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-primary);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-bg);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ===== HERO SECTION ===== */
.hero {
    padding: var(--spacing-xl) 0;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

/* ===== CONTENT SECTIONS ===== */
.content-section {
    margin-bottom: var(--spacing-lg);
}

.content-section h2 {
    margin-bottom: var(--spacing-md);
}

.content-section p {
    margin-bottom: var(--spacing-sm);
}

/* ===== GRID LAYOUTS ===== */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ===== CARDS ===== */
.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-md);
    transition: var(--transition);
}

.card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.card-content {
    color: var(--color-text-light);
}

/* ===== FORMS ===== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--color-primary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--color-text);
    transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-section h3,
.footer-section h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

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

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    transition: var(--transition);
}

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

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.social-links a {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-text-light);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

.footer-legal a {
    color: var(--color-text-light);
}

/* ===== UTILITIES ===== */
.text-center {
    text-align: center;
}

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

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--color-bg);
        width: 100%;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transition: left 0.3s ease;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}