/* ===================================
   MODERN DESIGN SYSTEM - LEVIFOTO
   =================================== */

:root {
    /* Primary Colors */
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --primary-light: #e6f0ff;
    
    /* Accent Colors */
    --accent: #ff6b35;
    --accent-light: #ffe6d5;
    
    /* Neutral Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Grayscale */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-secondary);
    color: var(--gray-700);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--gray-900);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

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

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

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #0052cc 100%);
    color: var(--white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #0040a3 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-200);
    border-color: var(--gray-300);
}

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

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

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
}

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

/* ===== HEADER ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1100;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.site-header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.brand-block {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.brand {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

/* ===== NAVIGATION ===== */
.site-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
    flex: 1;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 500;
    color: var(--gray-600);
    border-bottom: 2px solid transparent;
    transition: all var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.nav-search {
    position: relative;
    flex: 1;
    max-width: 300px;
}

.nav-search input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: var(--gray-50);
    font-size: 0.9rem;
    transition: all var(--transition-base);
}

.nav-search input:focus {
    outline: none;
    background: var(--white);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.nav-search i {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-user {
    position: relative;
}

.nav-user-button {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
    color: var(--gray-700);
    transition: color var(--transition-base);
}

.nav-user-button:hover {
    color: var(--primary);
}

.nav-user-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md) 0;
    min-width: 200px;
    display: none;
    flex-direction: column;
    margin-top: var(--spacing-sm);
}

.nav-user-menu.active {
    display: flex;
}

.nav-user-menu a,
.nav-user-menu span {
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--gray-700);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: background var(--transition-base);
}

.nav-user-menu a:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.nav-divider {
    height: 1px;
    background: var(--gray-200);
    margin: var(--spacing-sm) 0;
}

/* ===== FOOTER ===== */
.site-footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-3xl) var(--spacing-lg);
    margin-top: var(--spacing-3xl);
}

.footer-grid {
    max-width: 1400px;
    margin: 0 auto var(--spacing-2xl);
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-3xl);
}

.footer-brand h3 {
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #0066ff, #ff6b35);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--gray-400);
    margin-bottom: var(--spacing-lg);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.footer-section h5 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-md);
}

.footer-section a {
    color: var(--gray-400);
    transition: color var(--transition-base);
}

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

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: var(--spacing-2xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: var(--gray-400);
    font-size: 0.9rem;
}

/* ===== SCROLL TO TOP BUTTON ===== */
.scroll-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: var(--white);
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.scroll-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.scroll-top.active {
    display: flex;
}

/* ===== RESPONSIVE MENU ===== */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: all var(--transition-fast);
    border-radius: 1px;
}

@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .site-header-inner {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        border-bottom: 1px solid var(--gray-200);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        width: 100%;
    }
    
    .site-nav.active {
        display: flex;
    }
    
    .nav-links {
        flex-direction: column;
        gap: var(--spacing-md);
        width: 100%;
    }
    
    .nav-search {
        max-width: 100%;
    }
    
    .nav-actions {
        width: 100%;
        flex-wrap: wrap;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
}

/* ===== UTILITY CLASSES ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

.text-muted {
    color: var(--gray-500);
}

.mt-2 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-xl); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.py-4 { padding: var(--spacing-xl) 0; }
.py-6 { padding: var(--spacing-2xl) 0; }

/* ===== ALERTS & MESSAGES ===== */
.alert {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid;
    margin-bottom: var(--spacing-md);
}

.alert-warning {
    background: #fef3c7;
    border-color: var(--warning);
    color: #92400e;
}

.alert-success {
    background: #d1fae5;
    border-color: var(--success);
    color: #065f46;
}

.alert-danger {
    background: #fee2e2;
    border-color: var(--danger);
    color: #7f1d1d;
}

/* ===== FORMS ===== */
.form-control {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--gray-700);
}