/* 
 * Erkan Karasaç - Portfolio 2026 (Redesign)
 * Style: Modern Minimalist, Mobile-First, Swiss Design Influence
 */

:root {
    /* --- Modern Color Palette --- */
    --bg-main: #09090b;
    /* Zinc 950 - Ultra dark, neutral */
    --bg-surface: #18181b;
    /* Zinc 900 - Subtle contrast for cards */
    --bg-highlight: #27272a;
    /* Zinc 800 - Borders/Hovers */

    --text-primary: #f4f4f5;
    /* Zinc 100 - High contrast text */
    --text-secondary: #a1a1aa;
    /* Zinc 400 - Readable muted text */
    --text-tertiary: #52525b;
    /* Zinc 600 - Subtle details */

    --accent-color: #2dd4bf;
    /* Teal 400 - Fresh, vibrant, professional */
    --accent-glow: rgba(45, 212, 191, 0.15);
    /* Soft glow for interactions */

    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(45, 212, 191, 0.5);

    /* --- Typography --- */
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Outfit', sans-serif;
    /* For Headings */

    /* --- Spacing System --- */
    --spacing-xs: 0.5rem;
    /* 8px */
    --spacing-sm: 1rem;
    /* 16px */
    --spacing-md: 2rem;
    /* 32px */
    --spacing-lg: 4rem;
    /* 64px */
    --spacing-xl: 8rem;
    /* 128px */

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    --container-max: 1280px;
    --header-height: 72px;

    /* --- Transitions --- */
    --ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);
    --duration: 0.3s;
}

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

html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
    /* Relaxed snapping */
    height: 100vh;
    overflow-y: scroll;
    /* For snap alignment offset */
    scroll-padding-top: var(--header-height);
    font-size: 16px;
    /* Base for rems */
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    margin-bottom: var(--spacing-sm);
}

h2 {
    font-size: clamp(2rem, 3vw, 2.5rem);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: 1.5rem;
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    max-width: 65ch;
    /* Optimal reading length */
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration) var(--ease-out);
}

ul {
    list-style: none;
}

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

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

.section {
    min-height: 100vh;
    padding: calc(var(--header-height) + 2rem) 0 4rem 0;
    /* Ensure header clearance */
    position: relative;
    overflow: hidden;
    scroll-snap-align: start;
    scroll-snap-stop: normal;
    /* Allow smoother scrolling */
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    /* Align to top to prevent overflow issues */
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(9, 9, 11, 0.85);
    /* Proper glassmorphism background */
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo span {
    color: var(--accent-color);
}

.nav-links {
    display: none;
    /* Hidden on mobile initially */
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
        gap: var(--spacing-md);
    }

    .nav-link {
        font-size: 0.95rem;
        font-weight: 500;
        color: var(--text-secondary);
        position: relative;
    }

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

    .nav-link.active::after {
        content: '';
        position: absolute;
        bottom: -4px;
        left: 0;
        width: 100%;
        height: 2px;
        background: var(--accent-color);
        border-radius: var(--radius-full);
    }
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: flex;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-xs);
}

@media (min-width: 768px) {
    .menu-toggle {
        display: none;
    }
}

/* Mobile Nav Dropdown Styles (Applied via JS toggle) */
@media (max-width: 767px) {
    .nav-links {
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--bg-main);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
        display: none;
        /* Changed from default behavior to explicit */
    }

    .nav-links.active {
        display: flex;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-sm) 0;
        font-size: 1.1rem;
        border-bottom: 1px solid var(--border-color);
    }
}

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* Ensure column layout for mobile */
    justify-content: center;
    /* Restore vertical centering for Hero */
    align-items: center;
    padding-top: var(--header-height);
}

.hero .container>div {
    /* Targeting the flex container in index.html */
    display: grid !important;
    /* Override inline styles */
    grid-template-columns: 1fr;
    gap: var(--spacing-lg) !important;
}

@media (min-width: 992px) {
    .hero .container>div {
        grid-template-columns: 1fr 1.2fr;
        /* Image left, Text right */
        align-items: center;
    }
}

.hero-image {
    order: -1;
    /* Image potentially first on mobile? Let's keep distinct */
    display: flex;
    justify-content: center;
}

.hero-image img {
    width: 250px !important;
    height: 250px !important;
    border-radius: var(--radius-full) !important;
    border: 2px solid var(--border-color) !important;
    box-shadow: 0 0 0 10px rgba(255, 255, 255, 0.02) !important;
    transition: transform var(--duration) var(--ease-out);
}

.hero-image img:hover {
    transform: scale(1.02);
    border-color: var(--accent-color) !important;
}

.hero-content h3 {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--accent-color);
    margin-bottom: var(--spacing-xs);
}

.hero-btns {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: all var(--duration) var(--ease-out);
    border: 1px solid transparent;
    white-space: nowrap;
    /* Prevent internal wrapping */
}

@media (max-width: 480px) {
    .hero-btns {
        gap: 0.5rem !important;
        /* Tighter gap */
    }

    .btn {
        padding: 0.75rem 1.2rem;
        /* Compact padding */
        font-size: 0.85rem;
        /* Smaller text */
        flex: 1;
        /* Distribute space evenly */
        min-width: 0;
        /* Allow flex shrink if needed */
    }
}

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

.btn-primary:hover {
    background: var(--accent-color);
    color: #000;
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

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

.btn-outline:hover {
    border-color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* --- Cards (General) --- */
.card-hover {
    background: var(--bg-surface) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-md) !important;
    transition: all var(--duration) ease;
}

.card-hover:hover {
    border-color: var(--border-hover) !important;
    transform: translateY(-4px);
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
}

/* --- Experience Section Specifics (Preserving Functionality) --- */
.experience-card {
    /* Base styles inherit from card-hover mostly, but specific tweaks */
    background: var(--bg-surface);
    padding: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.experience-card h3,
.experience-card h4 {
    color: var(--text-primary) !important;
}

.experience-card span {
    /* Date tags */
    background: rgba(255, 255, 255, 0.05) !important;
    color: var(--text-secondary) !important;
    border: 1px solid var(--border-color);
}

.hidden-content {
    display: none !important;
    /* Logic handled by JS, but start hidden */
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
}

.toggle-details-btn {
    background: transparent;
    border: none;
    color: var(--accent-color);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: var(--spacing-sm);
    transition: opacity 0.2s;
}

.toggle-details-btn:hover {
    opacity: 0.8;
    text-decoration: none;
}

/* Grid for Experience Minor (International etc) */
.experience-minor-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

@media (min-width: 640px) {
    .experience-minor-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .experience-minor-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Location/Memory Section */
.location-toggle-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-top: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    /* Mobile friendly: full width button */
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.location-toggle-btn:hover {
    background: var(--bg-highlight);
    color: var(--text-primary);
}

.memory-section {
    display: none;
    /* JS toggles this */
    margin-top: var(--spacing-sm);
}

.map-container {
    width: 100%;
    /* Height handled inline or by JS, but set base styles */
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: var(--bg-highlight);
    /* Skeleton loading feel */
}

/* --- Projects Grid --- */
/* --- Projects Grid (Updated) --- */
.folder-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    width: 100%;
}

@media (max-width: 900px) {
    .folder-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

.folder-card {
    background: var(--bg-surface) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-md) !important;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.folder-card:hover {
    border-color: var(--border-hover) !important;
    transform: translateY(-4px);
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
}

.folder-icon {
    font-size: 3.5rem;
    color: #fff;
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease;
}

.folder-card:hover .folder-icon {
    transform: scale(1.1);
}

.folder-title {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.folder-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* --- Lightbox (Apple/Mac Photos Style) --- */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.98);
    /* Deep black */
    z-index: 10000;

    /* Layout */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    /* Transitions */
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0.3s;
    backdrop-filter: blur(20px);
}

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

/* Wrapper for main image area */
.lightbox-main-area {
    width: 100%;
    height: 75vh;
    position: relative;
    /* Context for absolute stacked images */
    display: flex;
    /* Centering fallback */
    justify-content: center;
    align-items: center;
    overflow: hidden;
    /* Contain slides */
}

/* Base image style - Absolute for stacking */
.lightbox-content {
    position: absolute;
    top: 50%;
    left: 50%;
    /* Center with transform, but we will animate this transform */
    transform: translate(-50%, -50%) scale(1);
    max-width: 90%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);

    /* Crossfade Base State */
    opacity: 1;
    transition: opacity 0.25s ease-out, transform 0.25s ease-out;
    will-change: opacity, transform;
}

/* Entering State (New Slide) */
.slide-enter-next {
    opacity: 0;
    transform: translate(-40%, -50%) scale(0.96);
    /* Comes from right (translate X needs to account for centering -50%) -> actually let's stick to simpler CSS var or calc for sliding */
    /* Simplified: Just scale and opacity for crossfade to be safe and clean */
    transform: translate(-50%, -50%) scale(0.96);
}

/* Exiting State (Old Slide) */
.slide-exit {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.05);
    /* Slight zoom out/in effect on exit */
}

@media (max-width: 768px) {

    /* Mobile Lightbox Adjustments */
    .lightbox-main-area {
        height: 60vh !important;
        /* Reduce height to pull thumbs up */
    }

    .lightbox-thumbs {
        margin-top: 10px !important;
        /* Closer to image */
        padding-bottom: 20px;
        /* Safe space for bottom bars */
    }

    .lightbox-content {
        max-width: 95%;
        /* Use more width on mobile */
    }
}

/* Counter */
.lightbox-counter {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    font-weight: 500;
    font-family: var(--font-main);
    letter-spacing: 1px;
    z-index: 40;
}

/* Navigation Buttons */
.close-btn {
    position: absolute;
    top: 20px;
    right: 30px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 2rem;
    cursor: pointer;
    z-index: 40;
    transition: color 0.2s;
}

.close-btn:hover {
    color: #fff;
}

.prev-btn,
.next-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(40, 40, 40, 0.4);
    color: rgba(255, 255, 255, 0.8);
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    border-radius: 50%;
    z-index: 40;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.2s;
}

.prev-btn:hover,
.next-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-50%) scale(1.1);
}

.prev-btn {
    left: 24px;
}

.next-btn {
    right: 24px;
}

@media (max-width: 768px) {

    .prev-btn,
    .next-btn {
        display: none !important;
        /* Forces hiding on mobile, relying on swipe */
    }
}

/* Thumbnail Strip */
/* Thumbnail Strip */
.lightbox-thumbs {
    height: 80px;
    width: max-content;
    /* Allow shrinking */
    min-width: 0;
    /* Flexbox fix */
    max-width: 100%;
    /* Limit to screen width */
    margin: 20px auto 0 auto;
    /* Center the strip itself */

    display: flex;
    justify-content: flex-start;
    /* Items start from left, critical for scrolling */
    align-items: center;
    gap: 10px;

    overflow-x: auto;
    padding: 10px 20px;
    scroll-behavior: smooth;

    /* Hide scrollbar */
    scrollbar-width: none;
}

.lightbox-thumbs::-webkit-scrollbar {
    display: none;
}

.thumb-img {
    height: 50px;
    border-radius: 4px;
    opacity: 0.4;
    transition: all 0.2s;
    cursor: pointer;
    border: 2px solid transparent;
}

.thumb-img:hover {
    opacity: 0.8;
}

.thumb-img.active {
    opacity: 1;
    border-color: var(--accent-color);
    transform: scale(1.1);
}

/* Footer adjustment not needed for lightbox overlap */

/* --- Footer --- */
footer {
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    margin-top: var(--spacing-xl);
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    margin: 0 var(--spacing-xs);
    transition: color 0.2s;
}

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

/* --- Utils --- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Canvas Background (Subtle) */
#canvas1 {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    /* Ensure it stays behind content */
}

/* --- About Page Specific Styles (Merged) --- */
.scented-divider {
    width: 100%;
    height: 1px;
    background: var(--border-color);
    margin: 1.5rem 0 2rem 0;
    position: relative;
}

.scented-divider::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 60px;
    height: 100%;
    background: var(--accent-color);
}

.bio-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    font-weight: 300;
}

.section-block {
    margin-bottom: 6rem;
}

/* Education Cards - Minimal */
/* Education Cards - Minimal */
.edu-card {
    border-left: 2px solid var(--border-color);
    padding-left: 2rem;
    margin-bottom: 3rem;
    position: relative;
    transition: all 0.3s ease;
    display: block;
    text-decoration: none;
}

.edu-card:hover {
    border-left-color: var(--accent-color);
}

.edu-card::before {
    content: '';
    position: absolute;
    left: -9px;
    top: 0;
    width: 16px;
    height: 16px;
    background: var(--bg-main);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    transition: border-color 0.3s ease;
}

.edu-card:hover::before {
    border-color: var(--accent-color);
    background: var(--accent-color);
}

/* Skills Grid */
.skill-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .skill-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
}

.skill-item {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    height: 100%;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.skill-item:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.skill-item h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.skill-item h4 i {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.skill-list {
    margin: 0;
    padding: 0;
}

.skill-list li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.6rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.skill-list li::before {
    content: '•';
    /* Standard bullet */
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-color);
    font-size: 1.2rem;
    /* Adjusted for dot size */
    line-height: normal;
    /* Reset line height for alignment */
}

.cert-lang-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

@media (min-width: 768px) {
    .cert-lang-grid {
        grid-template-columns: 1fr 1fr;
    }
}