/* Color Palette */
:root {
    --role-base: #fbf9f6;
    --role-ink: #2e2621;
    --role-accent: #7a5a43;
    --role-info: #8b7d72;
    --color-primary: var(--role-accent);
    --color-secondary: var(--role-base);
    --color-accent: var(--role-accent);
    --color-dark: var(--role-ink);
    --color-highlight: var(--role-accent);
    --shadow-color: rgba(46, 38, 33, 0.12);
    --shadow-color-strong: rgba(46, 38, 33, 0.18);
    --border-color: rgba(46, 38, 33, 0.12);
    --text-muted: var(--role-info);
}

/* ============================================
   Language Toggle System
   ============================================ */

/* Hide inactive language blocks globally (except language switcher buttons) */
html[lang="tr"] [data-lang="en"]:not(.lang-button) {
    display: none !important;
}

html[lang="en"] [data-lang="tr"]:not(.lang-button) {
    display: none !important;
}

/* Ensure active language blocks are visible as flex containers (except language switcher buttons) */
html[lang="tr"] [data-lang="tr"]:not(.lang-button) {
    display: flex;
    flex-direction: column;
    gap: 0;
    width: 100%;
}

html[lang="en"] [data-lang="en"]:not(.lang-button) {
    display: flex;
    flex-direction: column;
    gap: 0;
    width: 100%;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden; /* Prevent body scroll, allow inner container to scroll */
}

/* Mobile: Enable body scroll for vertical stacking */
@media (max-width: 768px) {
    html, body {
        overflow: auto;
        height: auto;
    }
}

body {
    font-family: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--color-dark);
    background: var(--color-secondary);
    transition: background-color 0.25s ease;
    font-weight: 400;
}

/* Main container */
.cv-container {
    width: 100vw;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.cv-container::before {
    content: '';
    position: fixed;
    inset: 0;
    background: var(--role-base);
    opacity: 0;
    transition: opacity 0.45s ease;
    pointer-events: none;
    z-index: 500;
}

/* Language Switcher */
.language-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 5px;
    z-index: 1001;
    background: rgba(194, 252, 247, 0.9);
    padding: 5px;
    border-radius: 20px;
    box-shadow: 0 2px 10px var(--shadow-color);
}

/* Identity Block */
.identity-block {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--color-dark);
}

.identity-name {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: lowercase;
    line-height: 1.4;
}

.identity-email {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    color: var(--role-info);
    opacity: 0.6;
    text-decoration: none;
    transition: opacity 0.25s ease;
    margin-top: 2px;
}

.identity-email:hover {
    opacity: 1;
}

.email-icon {
    font-size: 0.85rem;
    display: inline-block;
    transition: transform 0.25s ease;
}

.identity-email:hover .email-icon {
    transform: scale(1.1);
}

.email-text {
    font-family: 'Satoshi', sans-serif;
    font-weight: 400;
}

.identity-writing {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    color: var(--role-info);
    opacity: 0.6;
    text-decoration: none;
    transition: opacity 0.25s ease;
    margin-top: 2px;
}

.identity-writing:hover {
    opacity: 1;
}

.writing-icon {
    font-size: 0.85rem;
    display: inline-block;
    transition: transform 0.25s ease;
}

.identity-writing:hover .writing-icon {
    transform: scale(1.1);
}

.writing-text {
    font-family: 'Satoshi', sans-serif;
    font-weight: 400;
}

.lang-button {
    padding: 6px 14px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.lang-button:hover {
    background: rgba(111, 115, 210, 0.08);
    color: var(--color-dark);
}

.lang-button.active {
    background: var(--color-accent);
    color: #ffffff;
}

/* Navigation */
.section-nav {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 1000;
    background: var(--role-base);
    padding: 10px 20px;
    border-radius: 25px;
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: transform 0.45s ease, top 0.45s ease, bottom 0.45s ease, padding 0.45s ease, border-radius 0.45s ease, gap 0.45s ease, width 0.45s ease, box-shadow 0.45s ease;
}

.nav-button {
    padding: 8px 16px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-muted);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.nav-button:hover {
    background: rgba(111, 115, 210, 0.08);
    color: var(--color-dark);
}

.nav-button.active {
    background: var(--color-accent);
    color: #ffffff;
    transform: scale(1.05);
    transition: all 0.3s ease;
}

/* Navigation Card Mode */
body.nav-mode-card .cv-container::before {
    opacity: 0.45;
}

body.nav-mode-card .section-nav {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) translateY(20px);
}

body.nav-mode-card {
    background: rgba(194, 252, 247, 0.92);
}

body.nav-mode-section {
    background: var(--role-base);
}

body.nav-mode-section .cv-container::before {
    opacity: 0;
}

body.nav-mode-section .section-nav.is-docked {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%);
}

body.nav-mode-card .nav-button {
    width: auto;
}

body.nav-mode-card .sections-wrapper {
    overflow-x: hidden;
    overflow-y: auto;
}

body.nav-mode-card .section-content {
    overflow-y: auto;
}

body.nav-mode-card .scroll-hint {
    opacity: 0;
    pointer-events: none;
}

body.nav-mode-section .identity-block {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

/* Navigation backdrop (card mode) */
.nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 900;
    background: var(--role-base);
    backdrop-filter: blur(10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.45s ease;
}

.nav-backdrop.is-visible {
    opacity: 1;
    pointer-events: auto;
}

/* Navigation cards (card mode) */
.nav-card-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) translateY(-28px);
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-between;
    align-content: flex-start;
    align-items: stretch;
    gap: clamp(16px, 2.2vw, 28px);
    width: min(90vw, 920px);
    overflow: visible;
    z-index: 1001;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.45s ease, transform 0.45s ease;
}

body.nav-mode-card .nav-card-container {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%);
}

body.nav-mode-section .nav-card-container {
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, -50%) translateY(-10px);
}

.nav-card-item {
    position: relative;
    width: clamp(160px, 12.5vw, 190px);
    min-width: clamp(160px, 12.5vw, 190px);
    max-width: clamp(160px, 12.5vw, 190px);
    min-height: 280px;
    height: auto;
    border: 1px solid var(--border-color);
    border-radius: 18px;
    background: #ffffff;
    box-shadow: 0 8px 18px var(--shadow-color);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 10px;
    padding: 18px 16px 34px 16px;
    text-align: left;
    cursor: pointer;
    transition: transform 0.2s ease;
    flex-shrink: 0;
    flex-grow: 0;
    overflow: visible;
}

.nav-card-title {
    display: block;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.02em;
    color: var(--color-dark);
    text-transform: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
}

.nav-card-title::before {
    content: '';
    display: block;
    font-size: 1.25rem;
    line-height: 1;
    color: rgba(47, 0, 79, 0.75);
    margin-bottom: 8px;
}

.nav-card-item[data-section="0"] .nav-card-title::before {
    content: '◻';
}

.nav-card-item[data-section="1"] .nav-card-title::before {
    content: '◆';
}

.nav-card-item[data-section="2"] .nav-card-title::before {
    content: '◇';
}

.nav-card-item[data-section="4"] .nav-card-title::before {
    content: '▲';
}

.nav-card-item[data-section="5"] .nav-card-title::before {
    content: '●';
}

.nav-card-summary {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin-top: 10px;
    width: 100%;
}

.nav-card-affordance {
    position: absolute;
    left: 16px;
    right: 16px;
    bottom: 12px;
    font-size: 0.7rem;
    letter-spacing: 0.02em;
    color: var(--text-muted);
    opacity: 0.65;
}

.nav-card-item.is-hovered,
.nav-card-item:hover {
    transform: translateY(-2px);
}

.nav-card-item.is-active {
    border-color: rgba(47, 0, 79, 0.28);
    background: rgba(47, 0, 79, 0.04);
    box-shadow: 0 10px 20px rgba(47, 0, 79, 0.14);
}

.nav-card-item.is-active .nav-card-title,
.nav-card-item.is-active .nav-card-summary {
    color: var(--color-dark);
}

.nav-card-item.is-active .nav-card-affordance,
.nav-card-item.is-active .nav-card-title::before {
    color: rgba(47, 0, 79, 0.65);
}

.nav-card-item:first-child {
    border-color: rgba(47, 0, 79, 0.28);
    box-shadow: 0 14px 30px rgba(47, 0, 79, 0.16);
}

@media (max-width: 1024px) {
    .nav-card-item {
        width: clamp(170px, 20vw, 210px);
        min-width: clamp(170px, 20vw, 210px);
        max-width: clamp(170px, 20vw, 210px);
    }

    .nav-card-container {
        width: min(92vw, 940px);
        gap: clamp(18px, 3vw, 32px);
    }
}

body.nav-mode-card .nav-card-container {
    width: max-content;
}

/* Horizontal scrolling wrapper */
.sections-wrapper {
    display: flex;
    flex-direction: row;
    width: 100vw; /* Container width */
    min-width: 100vw; /* Prevent shrinking */
    height: 100vh;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

/* Hide scrollbar but keep functionality */
.sections-wrapper::-webkit-scrollbar {
    display: none;
}

.sections-wrapper {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* Individual CV sections */
.cv-section {
    width: 100vw;
    height: 100vh;
    flex-shrink: 0;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    position: relative;
    background: var(--color-secondary);
    border-right: 1px solid var(--border-color);
    opacity: 1;
    transition: opacity 0.3s ease;
}

body.nav-mode-section .cv-section {
    background: var(--role-base);
}

body.nav-mode-section .section-content {
    background: var(--role-base);
    border-radius: 16px;
    box-shadow: 0 8px 20px var(--shadow-color);
    transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

body.nav-mode-section .section-content {
    line-height: 1.7;
}

body.nav-mode-section .section-content p {
    margin-bottom: 22px;
    max-width: 68ch;
}

body.nav-mode-section .section-content h1 {
    margin-bottom: 36px;
    max-width: 68ch;
}

body.nav-mode-section .section-content h2 {
    margin-top: 32px;
    margin-bottom: 12px;
    max-width: 68ch;
}

body.nav-mode-section .section-content ul,
body.nav-mode-section .section-content ol,
body.nav-mode-section .section-content .project-description,
body.nav-mode-section .section-content .tech-stack {
    max-width: 68ch;
}

body.nav-mode-section .section-content strong {
    font-weight: 500;
}

/* Section content - vertically scrollable */
.section-content {
    width: 100%;
    max-width: 680px;
    height: calc(100vh - 80px); /* Reserve space for bottom nav */
    margin: 0 auto;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 72px 32px 96px 32px; /* Extra bottom padding for nav clearance */
    scroll-behavior: smooth;
    transition: transform 0.2s ease-out;
}

/* Custom scrollbar for section-content */
.section-content::-webkit-scrollbar {
    width: 8px;
}

.section-content::-webkit-scrollbar-track {
    background: rgba(194, 252, 247, 0.5);
}

.section-content::-webkit-scrollbar-thumb {
    background: rgba(47, 0, 79, 0.12);
    border-radius: 4px;
}

.section-content::-webkit-scrollbar-thumb:hover {
    background: rgba(47, 0, 79, 0.2);
}

/* Typography */
.cv-section h1 {
    font-size: 3rem;
    margin-bottom: 40px;
    color: var(--color-dark);
    font-weight: 600;
    letter-spacing: -0.01em;
}

.cv-section h2 {
    font-size: 1.8rem;
    margin-top: 36px;
    margin-bottom: 14px;
    color: var(--color-dark);
    font-weight: 500;
    letter-spacing: -0.005em;
}

.cv-section p {
    margin-bottom: 22px;
    font-size: 1.1rem;
    color: var(--color-dark);
    font-weight: 400;
}

/* Experience section styles */
.experience-item,
.education-item {
    margin-bottom: 52px;
    padding-bottom: 0;
    border-bottom: none;
}

.experience-item:last-child,
.education-item:last-child {
    border-bottom: none;
}

/* Projects section styles */
.projects-container {
    margin-top: 20px;
}

.project-item {
    margin-bottom: 60px;
    padding: 0;
    border: none;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    transition: none;
}

.project-item:hover {
    border-color: transparent;
    box-shadow: none;
    background: transparent;
    transform: none;
}

/* Flagship project styling */
.project-item.flagship {
    border: none;
    background: transparent;
    box-shadow: none;
    position: static;
}

.project-item.flagship::before {
    content: none;
}

.project-item.flagship:hover {
    box-shadow: none;
    transform: none;
}

.project-item:last-child {
    margin-bottom: 0;
}

.project-item h2 {
    margin-top: 0;
    margin-bottom: 15px;
    color: var(--color-dark);
}

.project-description {
    margin-bottom: 15px;
    line-height: 1.7;
    color: var(--color-dark);
}

.company,
.institution {
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 5px;
}

.period {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-style: italic;
    margin-top: 5px;
}

.tech-stack {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 10px;
    margin-bottom: 0;
}

/* Project links styling */
.project-links {
    margin-top: 15px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.project-links a {
    color: var(--color-accent);
    text-decoration: none;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.project-links a:hover {
    background: rgba(111, 115, 210, 0.08);
    color: var(--color-dark);
    border-color: var(--border-color);
}

/* Skills section styles */
.skills-category {
    margin-bottom: 30px;
}

.skills-category ul {
    list-style: none;
    padding-left: 0;
}

.skills-category li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.skills-category li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--text-muted);
}

/* Contact section styles */
.contact-info {
    margin-bottom: 30px;
}

.contact-info p {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.social-links {
    margin-top: 30px;
}

.social-links ul {
    list-style: none;
    padding-left: 0;
}

.social-links li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.social-links li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--text-muted);
}

/* ============================================
   Mobile Responsive Layout (Vertical Stacking)
   ============================================ */

@media (max-width: 768px) {
    /* Mobile: Switch to vertical layout */
    .sections-wrapper {
        flex-direction: column;
        width: 100vw;
        height: auto;
        overflow-x: hidden;
        overflow-y: visible;
        scroll-snap-type: none;
    }
    
    .cv-section {
        width: 100vw;
        height: auto;
        min-height: 100vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .section-content {
        height: auto;
        min-height: 100vh;
        padding: 40px 20px;
    }
    
    /* Hide navigation on mobile (or make it sticky) */
    .section-nav {
        display: none; /* Optional: can be changed to sticky if needed */
    }
    
    /* Language switcher positioning on mobile */
    .language-switcher {
        top: 10px;
        right: 10px;
        padding: 4px;
    }
    
    .lang-button {
        padding: 5px 12px;
        font-size: 12px;
    }
    
    /* Adjust typography for mobile */
    .cv-section h1 {
        font-size: 2rem;
    }
    
    .cv-section h2 {
        font-size: 1.5rem;
    }

    /* Ensure nav-mode-card does not block mobile scrolling */
    body.nav-mode-card .cv-container::before {
        opacity: 0;
    }

    body.nav-mode-card .sections-wrapper {
        overflow-y: visible;
        overflow-x: hidden;
    }

    body.nav-mode-card .section-content {
        overflow-y: visible;
    }

    .nav-card-container {
        display: none;
    }

    .nav-backdrop {
        display: none;
    }
}

/* ============================================
   Accessibility: Prefers Reduced Motion
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .scroll-hint {
        animation: none !important;
    }
    
    .sections-wrapper {
        scroll-behavior: auto !important;
    }
    
    .section-content {
        scroll-behavior: auto !important;
    }
}

/* Scroll hint micro-interaction */
.scroll-hint {
    position: absolute;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.9rem;
    color: var(--text-muted);
    opacity: 0.7;
    pointer-events: none;
    transition: opacity 0.4s ease, transform 0.4s ease;
    z-index: 100;
    animation: subtle-bounce 2s ease-in-out infinite;
}

.scroll-hint.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
    pointer-events: none;
}

@keyframes subtle-bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* Subtle transitions for section content */
.cv-section h1,
.cv-section h2 {
    transition: opacity 0.3s ease;
}

.experience-item,
.education-item,
.project-item {
    transition: opacity 0.2s ease;
}

/* Tag/Pill Styles for Skills & Roles */
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0 24px 0;
}

.tag {
    display: inline-block;
    padding: 6px 14px;
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-base);
    background-color: var(--bg-surface);
    border: 1px solid rgba(46, 38, 33, 0.15);
    border-radius: 16px;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tag:hover {
    background-color: var(--bg-overlay);
    border-color: rgba(46, 38, 33, 0.25);
}