/**
 * Main application styles
 * Photographer Alexey Koshelev Portfolio
 */

/* ============================================
   CSS Custom Properties (Variables)
   ============================================ */
:root {
    /* Colors */
    --color-black: #0a0a0a;
    --color-dark: #1a1a1a;
    --color-gray-dark: #2a2a2a;
    --color-gray: #6b6b6b;
    --color-gray-light: #9b9b9b;
    --color-gray-lighter: #d4d4d4;
    --color-gray-lightest: #e8e8e8;
    --color-white: #ffffff;
    --color-off-white: #f8f8f8;
    
    /* Accent colors */
    --color-accent: #c9a962;
    --color-accent-hover: #b89950;
    --color-accent-strong: #8b6a2b;
    
    /* Typography */
    --font-heading: 'Formular', 'Lack', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Lack', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Font sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    
    /* 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;
    
    /* Layout */
    --container-max: 1200px;
    --header-height: 80px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Border radius */
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 8px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scrollbar-gutter: stable;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

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

ul, ol {
    list-style: none;
}

blockquote {
    margin: var(--spacing-lg) 0;
    padding-left: var(--spacing-lg);
    border-left: 3px solid var(--color-accent);
    font-style: italic;
}

code, pre {
    font-family: 'Courier New', monospace;
    background: var(--color-off-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

pre {
    padding: var(--spacing-md);
    overflow-x: auto;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-black);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

@media (min-width: 768px) {
    h1 { font-size: var(--text-5xl); }
    h2 { font-size: var(--text-4xl); }
    h3 { font-size: var(--text-3xl); }
}

/* ============================================
   Layout
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.site-main {
    flex: 1;
}

.section {
    padding: var(--spacing-3xl) 0;
}

@media (min-width: 768px) {
    .section {
        padding: var(--spacing-2xl) 0;
    }
}

/* ============================================
   Skip Link (Accessibility)
   ============================================ */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-black);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-sm);
}

/* ============================================
   Header
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-lightest);
    z-index: 1000;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.site-logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.02em;
}

.logo-subtitle {
    font-size: var(--text-xs);
    color: var(--color-gray);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Navigation */
.main-navigation {
    display: none;
}

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

.nav-item {
    position: relative;
}

.nav-link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-dark);
    padding: var(--spacing-sm) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-black);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-dropdown-list {
    display: none;
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-dropdown-link {
    position: relative;
    display: block;
    color: var(--color-dark);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-dropdown-link::after {
    content: '';
    position: absolute;
    left: var(--spacing-lg);
    bottom: 6px;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-dropdown-link.active {
    color: var(--color-black);
    font-weight: 600;
}

.nav-dropdown-link:hover::after,
.nav-dropdown-link:focus-visible::after,
.nav-dropdown-link.active::after {
    width: calc(100% - (var(--spacing-lg) * 2));
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-dark);
    position: relative;
    transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--color-dark);
    transition: transform var(--transition-fast);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* Mobile menu active state */
.mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile navigation styles */
@media (max-width: 767px) {
    .main-navigation {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-white);
        z-index: 999;
        overflow-y: auto;
        padding: var(--spacing-xl);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    .main-navigation.mobile-active {
        display: block;
        animation: slideDown 0.3s ease;
    }

    .main-navigation .nav-list {
        flex-direction: column;
        gap: 0;
    }

    .main-navigation .nav-item {
        border-bottom: 1px solid var(--color-gray-lightest);
    }

    .main-navigation .nav-link {
        display: block;
        padding: var(--spacing-lg) 0;
        font-size: var(--text-lg);
    }

    .main-navigation .nav-link::after {
        display: none;
    }

    .main-navigation .nav-item-dropdown .nav-dropdown-list {
        display: flex;
        flex-direction: column;
        gap: 0;
        margin: 0 0 var(--spacing-md) var(--spacing-lg);
        padding-left: var(--spacing-lg);
        border-left: 1px solid var(--color-gray-lighter);
    }

    .main-navigation .nav-dropdown-link {
        display: block;
        padding: var(--spacing-sm) 0;
        font-size: var(--text-base);
        color: var(--color-gray);
    }

    .main-navigation .nav-dropdown-link.active {
        color: var(--color-black);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (min-width: 768px) {
    .main-navigation {
        display: block;
    }

    .mobile-menu-toggle {
        display: none;
    }

    .nav-item-dropdown::after {
        content: '';
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        height: 10px;
    }

    .nav-item-dropdown .nav-dropdown-list {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 260px;
        background: var(--color-white);
        border: 1px solid var(--color-gray-lightest);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-sm) 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(6px);
        pointer-events: none;
        transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
        z-index: 1002;
    }

    .nav-item-dropdown:hover .nav-dropdown-list,
    .nav-item-dropdown:focus-within .nav-dropdown-list {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        pointer-events: auto;
    }

    .nav-item-dropdown .nav-dropdown-link {
        display: block;
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--text-sm);
        color: var(--color-dark);
    }

    .nav-item-dropdown .nav-dropdown-link:hover,
    .nav-item-dropdown .nav-dropdown-link:focus-visible {
        color: var(--color-black);
    }
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: var(--color-dark);
    color: var(--color-gray-light);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: auto;
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-white);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    font-size: var(--text-sm);
    margin-bottom: var(--spacing-md);
}

.footer-contacts {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer-phone,
.footer-email {
    color: var(--color-white);
    font-size: var(--text-sm);
}

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

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-gray);
    border-radius: 50%;
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-white);
    transition: all var(--transition-fast);
}

.social-link:hover {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: var(--color-white);
}

.footer-nav-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.footer-nav-list,
.footer-services-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-nav-list a,
.footer-services-list li {
    font-size: var(--text-sm);
    color: var(--color-gray-light);
}

.footer-nav-list a:hover {
    color: var(--color-white);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-dark);
    font-size: var(--text-sm);
}

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

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

@media (min-width: 768px) {
    .footer-main {
        grid-template-columns: 2fr 1fr 1fr;
    }
    
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
    
    .footer-legal {
        margin: 0;
    }
}

/* ============================================
   Cookie Notice
   ============================================ */
.cookie-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-lg);
    z-index: 999;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
}

.cookie-notice-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
    text-align: center;
}

.cookie-notice-text {
    font-size: var(--text-sm);
    max-width: 800px;
}

.cookie-notice-text a {
    color: var(--color-accent);
    text-decoration: underline;
}

.cookie-notice-accept {
    background: var(--color-accent);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.cookie-notice-accept:hover {
    background: var(--color-accent-hover);
}

@media (min-width: 768px) {
    .cookie-notice-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}