/* ==========================================
   Portfolio Site - Main Stylesheet
   ========================================== */

/* CSS Custom Properties */
:root {
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-text-muted: #999999;
    --color-border: #e5e5e5;
    --color-hover: #000000;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --sidebar-width: 220px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-weight: 300;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
}

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

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

ul {
    list-style: none;
}

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

button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

/* ==========================================
   Sidebar
   ========================================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--color-bg);
    border-right: 1px solid var(--color-border);
    z-index: 100;
    display: flex;
    flex-direction: column;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-lg) var(--spacing-md);
}

.sidebar-header {
    margin-bottom: var(--spacing-xl);
}

.logo {
    font-size: 1.125rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--color-text);
}

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

/* Main Navigation */
.main-nav {
    margin-bottom: var(--spacing-lg);
}

.main-nav ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.main-nav a {
    display: block;
    padding: var(--spacing-xs) 0;
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-light);
    letter-spacing: 0.02em;
    transition: color var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-text);
}

/* Category Navigation */
.category-nav {
    flex: 1;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.category-nav ul {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.category-link {
    display: block;
    padding: 6px 0;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    letter-spacing: 0.01em;
    transition: color var(--transition-fast);
}

.category-link:hover {
    color: var(--color-text);
}

.category-link.active {
    color: var(--color-text);
    font-weight: 400;
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding-top: var(--spacing-md);
}

.sidebar-footer p {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.02em;
}

/* Mobile Header */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 200;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
}

.desktop-only {
    display: block;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: flex;
    width: 32px;
    height: 32px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    z-index: 201;
}

.mobile-menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-normal);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==========================================
   Main Content
   ========================================== */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: var(--spacing-lg);
}

/* Gallery Grid */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.gallery-item {
    overflow: hidden;
    cursor: pointer;
    opacity: 1;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.gallery-item.hidden {
    display: none;
}

.gallery-item.fade-out {
    opacity: 0;
    transform: scale(0.95);
}

.gallery-item img {
    width: 100%;
    height: auto;
    object-fit: cover;
    transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.gallery-item:hover img {
    transform: scale(1.02);
    opacity: 0.9;
}

/* ==========================================
   Lightbox
   ========================================== */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.98);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-content {
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    box-shadow: 0 4px 40px rgba(0, 0, 0, 0.1);
}

.lightbox-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 2rem;
    color: var(--color-text);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast);
}

.lightbox-close:hover {
    color: var(--color-text-light);
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2.5rem;
    color: var(--color-text);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast);
}

.lightbox-prev {
    left: var(--spacing-md);
}

.lightbox-next {
    right: var(--spacing-md);
}

.lightbox-prev:hover,
.lightbox-next:hover {
    color: var(--color-text-light);
}

.lightbox-counter {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
}

/* ==========================================
   Page Styles (About, Contact)
   ========================================== */
.page-content {
    max-width: 600px;
    padding: var(--spacing-xl) 0;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.05em;
}

.page-text {
    font-size: 0.9375rem;
    line-height: 1.8;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.page-text:last-child {
    margin-bottom: 0;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.8125rem;
    font-weight: 400;
    color: var(--color-text);
    letter-spacing: 0.02em;
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-sm);
    font-family: inherit;
    font-size: 0.9375rem;
    border: 1px solid var(--color-border);
    border-radius: 2px;
    background-color: var(--color-bg);
    transition: border-color var(--transition-fast);
}

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

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

.submit-btn {
    align-self: flex-start;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    color: var(--color-bg);
    background-color: var(--color-text);
    border: 1px solid var(--color-text);
    border-radius: 2px;
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.submit-btn:hover {
    background-color: transparent;
    color: var(--color-text);
}

/* Social Links */
.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.social-links a {
    font-size: 0.875rem;
    color: var(--color-text-light);
    letter-spacing: 0.02em;
}

.social-links a:hover {
    color: var(--color-text);
}

/* Instagram Button */
.instagram-link-wrapper {
    margin-top: var(--spacing-xl);
}

.instagram-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 0.9375rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    color: var(--color-bg);
    background-color: var(--color-text);
    border: 1px solid var(--color-text);
    border-radius: 2px;
    transition: background-color var(--transition-normal), color var(--transition-normal), border-color var(--transition-normal);
}

.instagram-btn:hover {
    background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
    border-color: #dc2743;
    color: #ffffff;
}

.instagram-btn svg {
    flex-shrink: 0;
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1200px) {
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .mobile-header {
        display: flex;
    }

    .desktop-only {
        display: none;
    }

    .sidebar {
        top: 60px;
        height: calc(100vh - 60px);
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        border-right: none;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.05);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        margin-top: 60px;
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-md: 16px;
        --spacing-lg: 24px;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .lightbox-prev,
    .lightbox-next {
        width: 44px;
        height: 44px;
        font-size: 2rem;
    }

    .page-content {
        padding: var(--spacing-lg) 0;
    }
}

@media (max-width: 480px) {
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .lightbox-prev {
        left: var(--spacing-xs);
    }

    .lightbox-next {
        right: var(--spacing-xs);
    }
}