/* ============================================
   PERSONAL PORTFOLIO - MODERN DARK/LIGHT THEME
   Font: Instagram Sans (if available) with system fallbacks
   ============================================ */

/* ============================================
   FONT FACE - INSTAGRAM SANS (OPTION A)
   ============================================ */
/*
   OPTION A: Instagram Sans Custom Font
   
   To enable Instagram Sans, place the font files in the fonts/ folder:
   - InstagramSans-Regular.woff2
   - InstagramSans-Medium.woff2
   - InstagramSans-Bold.woff2
   
   Then uncomment the @font-face rules below:
*/

/*
@font-face {
    font-family: 'Instagram Sans';
    src: url('../fonts/InstagramSans-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Instagram Sans';
    src: url('../fonts/InstagramSans-Medium.woff2') format('woff2');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Instagram Sans';
    src: url('../fonts/InstagramSans-Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}
*/

/* ============================================
   CSS VARIABLES - DARK THEME (DEFAULT)
   ============================================ */
:root {
    /* Dark Theme Colors */
    --bg-primary: #0a0e27;
    --bg-secondary: #131829;
    --bg-tertiary: #1a1f3a;
    --bg-card: #1e2442;
    --bg-hover: #252b4a;
    
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3c1;
    --text-tertiary: #8a8d9a;
    
    --accent-primary: #5b7cff;
    --accent-secondary: #4a6ae8;
    --accent-glow: rgba(91, 124, 255, 0.3);
    
    --border-color: #2a3150;
    --border-hover: #3a4160;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --glow: 0 0 20px var(--accent-glow);
    
    /* Typography - Instagram Sans with System Fallbacks (OPTION B: Default) */
    /* If Instagram Sans font files are available, they will be used. Otherwise falls back to system fonts. */
    --font-primary: 'Instagram Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 64px;
    --spacing-2xl: 96px;
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 70px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ============================================
   LIGHT THEME
   ============================================ */
[data-theme="light"] {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8ecf1;
    --bg-card: #ffffff;
    --bg-hover: #f0f3f7;
    
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-tertiary: #6a6a6a;
    
    --accent-primary: #0a66c2;
    --accent-secondary: #004182;
    --accent-glow: rgba(10, 102, 194, 0.2);
    
    --border-color: #d0d4d8;
    --border-hover: #a8adb3;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --glow: 0 0 20px var(--accent-glow);
}

/* ============================================
   PREFERS COLOR SCHEME - System Theme Support
   ============================================ */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --bg-primary: #f5f7fa;
        --bg-secondary: #ffffff;
        --bg-tertiary: #e8ecf1;
        --bg-card: #ffffff;
        --bg-hover: #f0f3f7;
        
        --text-primary: #1a1a1a;
        --text-secondary: #4a4a4a;
        --text-tertiary: #6a6a6a;
        
        --accent-primary: #0a66c2;
        --accent-secondary: #004182;
        --accent-glow: rgba(10, 102, 194, 0.2);
        
        --border-color: #d0d4d8;
        --border-hover: #a8adb3;
        
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
        --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    }
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background: var(--bg-primary);
    min-height: 100%;
}

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background var(--transition-slow), color var(--transition-fast);
}

/* Fix bottom overscroll - ensure footer background extends beyond */
.footer {
    background: var(--bg-primary);
}

html::after {
    content: '';
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100vh;
    background: var(--bg-primary);
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(var(--bg-card-rgb), 0.95);
    backdrop-filter: blur(10px);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
    gap: var(--spacing-md);
}

.logo {
    font-size: 20px;
    font-weight: var(--font-weight-medium);
    color: var(--accent-primary);
    letter-spacing: -0.5px;
    white-space: nowrap;
}

/* Center Navigation */
.nav {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-normal);
    font-size: 14px;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--accent-primary);
    background-color: var(--bg-hover);
    transform: translateY(-1px);
}

/* Subtle focus style - no ugly square outlines */
.nav-link:focus-visible {
    outline: none;
    color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--accent-primary);
    transition: transform var(--transition-fast);
}

.nav-link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

/* Header Controls */
.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-social {
    display: flex;
    gap: 8px;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--text-tertiary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.social-icon svg {
    width: 18px;
    height: 18px;
}

.social-icon:hover {
    color: var(--accent-primary);
    background: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Subtle focus style for social icons */
.social-icon:focus-visible {
    outline: none;
    color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

/* Language Selector */
.language-selector {
    padding: 8px 12px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-primary);
    font-size: 13px;
    font-weight: var(--font-weight-normal);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.language-selector:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--glow);
    transform: translateY(-1px);
}

/* Subtle focus style for language selector */
.language-selector:focus,
.language-selector:focus-visible {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

/* Theme Toggle Button */
.theme-toggle {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    position: relative;
}

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

.theme-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

/* Subtle focus style for theme toggle */
.theme-toggle:focus,
.theme-toggle:focus-visible {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

/* Theme Toggle Icons - Moon for Dark Mode, Sun for Light Mode */
.theme-toggle svg {
    width: 20px;
    height: 20px;
    position: absolute;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

/* Dark mode: show moon icon */
[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
}

/* Light mode: show sun icon */
[data-theme="light"] .sun-icon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="light"] .moon-icon {
    opacity: 0;
    transform: rotate(90deg);
}

/* ============================================
   HERO / BIO SECTION
   ============================================ */
.hero {
    margin-top: var(--header-height);
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
}

.hero-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
    align-items: center;
}

/* Left Side - Avatar and Basic Info */
.hero-left {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
}

.avatar-wrapper {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--accent-primary);
    box-shadow: var(--shadow-lg), var(--glow);
    transition: all var(--transition-normal);
}

.avatar-wrapper:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 40px rgba(91, 124, 255, 0.4);
}

.avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-name {
    font-size: 36px;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    letter-spacing: -1px;
    margin-top: var(--spacing-sm);
}

.hero-title {
    font-size: 16px;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    line-height: 1.4;
    max-width: 280px;
}

/* Quick Contact Icons */
.quick-contacts {
    display: flex;
    gap: 12px;
    margin-top: var(--spacing-sm);
}

.contact-icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--bg-card);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.contact-icon-btn svg {
    width: 20px;
    height: 20px;
}

.contact-icon-btn:hover {
    background: var(--accent-primary);
    color: #ffffff;
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md), var(--glow);
}

/* Right Side - Professional Summary */
.hero-right {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.summary-title {
    font-size: 24px;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.summary-text {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Download CV Button */
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--accent-primary);
    color: #ffffff;
    border-radius: var(--border-radius-sm);
    font-weight: var(--font-weight-semibold);
    font-size: 15px;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn-download svg {
    width: 20px;
    height: 20px;
}

.btn-download:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--glow);
}

/* ============================================
   TIMELINE SECTIONS (Experience & Education)
   ============================================ */
.timeline-section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: 32px;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-primary);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

/* Timeline Container */
.timeline {
    position: relative;
    padding-left: 40px;
}

/* Vertical Line */
.timeline::before {
    content: '';
    position: absolute;
    left: 16px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

/* Timeline Item */
.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
}

/* Timeline Marker (Node + Icon) */
.timeline-marker {
    position: absolute;
    left: -40px;
    top: 0;
}

.timeline-icon {
    width: 36px;
    height: 36px;
    background: var(--accent-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 0 4px var(--bg-primary), var(--glow);
    position: relative;
    z-index: 2;
}

.timeline-icon svg {
    width: 18px;
    height: 18px;
    color: #ffffff;
}

.timeline-icon.education-icon {
    background: #10b981;
    box-shadow: 0 0 0 4px var(--bg-primary), 0 0 20px rgba(16, 185, 129, 0.3);
}

/* Timeline Content Card */
.timeline-content {
    flex: 1;
}

.timeline-card {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    display: flex;
    gap: 0;
}

.timeline-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.timeline-card-content {
    flex: 1;
    min-width: 0;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.timeline-title {
    font-size: 20px;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: 6px;
}

.timeline-subtitle {
    font-size: 16px;
    color: var(--accent-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: 4px;
}

.timeline-location {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: var(--font-weight-normal);
}

.timeline-coursework {
    font-size: 13px;
    color: var(--text-tertiary);
    font-style: italic;
    margin-top: 4px;
}

.timeline-date {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
    background: var(--bg-tertiary);
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
}

.timeline-description {
    list-style: none;
    padding-left: var(--spacing-sm);
}

.timeline-description li {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 8px;
    position: relative;
    padding-left: 20px;
}

.timeline-description li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

.timeline-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-tertiary);
}

.skills-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.skill-category {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.skill-category-title {
    font-size: 22px;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

/* Skill Chips with Proficiency Dots */
.skill-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-chip {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 10px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    font-size: 14px;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.skill-chip:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.skill-dots {
    display: flex;
    gap: 3px;
}

.dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--border-color);
    transition: background var(--transition-fast);
}

.dot.filled {
    background: var(--accent-primary);
}

/* Tool Tags (Simple Pill Style) */
.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tool-tag {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.tool-tag:hover {
    background: var(--accent-primary);
    color: #ffffff;
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* ============================================
   LANGUAGES SECTION
   ============================================ */
.languages-section {
    padding: var(--spacing-xl) 0;
}

.language-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.language-item {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.language-item:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.language-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.language-name {
    font-size: 18px;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.language-level {
    font-size: 13px;
    font-weight: var(--font-weight-medium);
    color: var(--text-tertiary);
    background: var(--bg-tertiary);
    padding: 4px 10px;
    border-radius: 12px;
}

/* Language Progress Bar */
.language-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.language-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 3px;
    transition: width var(--transition-slow);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-tertiary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-normal);
}

.contact-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.contact-card-icon {
    width: 50px;
    height: 50px;
    margin: 0 auto var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}

.contact-card-icon svg {
    width: 24px;
    height: 24px;
}

.contact-card-title {
    font-size: 16px;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: 8px;
}

.contact-card-link {
    font-size: 14px;
    color: var(--accent-primary);
    text-decoration: none;
    word-break: break-word;
    transition: color var(--transition-fast);
}

.contact-card-link:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

.contact-card-text {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--spacing-lg) 0;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer p {
    font-size: 14px;
    color: var(--text-tertiary);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablets and smaller (max-width: 900px) */
@media (max-width: 900px) {
    .nav-wrapper {
        flex-wrap: wrap;
        height: auto;
        padding: var(--spacing-sm) 0;
    }
    
    .header {
        height: auto;
    }
    
    .nav {
        order: 3;
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .hero-left {
        order: 1;
    }
    
    .hero-right {
        order: 2;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .timeline {
        padding-left: 30px;
    }
    
    .timeline::before {
        left: 12px;
    }
    
    .timeline-marker {
        left: -30px;
    }
    
    .timeline-icon {
        width: 28px;
        height: 28px;
    }
    
    .timeline-icon svg {
        width: 14px;
        height: 14px;
    }
}

/* Mobile phones (max-width: 600px) */
@media (max-width: 600px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .logo {
        font-size: 18px;
    }
    
    .header-social {
        display: none;
    }
    
    .language-selector {
        font-size: 12px;
        padding: 6px 10px;
    }
    
    .theme-toggle {
        width: 36px;
        height: 36px;
    }
    
    .avatar-wrapper {
        width: 150px;
        height: 150px;
    }
    
    .hero-name {
        font-size: 28px;
    }
    
    .hero-title {
        font-size: 14px;
    }
    
    .quick-contacts {
        gap: 8px;
    }
    
    .contact-icon-btn {
        width: 40px;
        height: 40px;
    }
    
    .hero-right {
        padding: var(--spacing-md);
    }
    
    .summary-title {
        font-size: 20px;
    }
    
    .summary-text {
        font-size: 15px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .timeline-date {
        align-self: flex-start;
    }
    
    .timeline-card {
        padding: var(--spacing-sm);
    }
    
    .timeline-title {
        font-size: 18px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* Small Mobile (max-width: 400px) */
@media (max-width: 400px) {
    .nav {
        gap: 6px;
    }
    
    .nav-link {
        font-size: 12px;
        padding: 6px 10px;
    }
    
    .skill-chips,
    .tool-tags {
        gap: 8px;
    }
    
    .skill-chip {
        padding: 8px 14px;
        font-size: 13px;
    }
    
    .tool-tag {
        padding: 6px 12px;
        font-size: 12px;
    }
}

/* ============================================
   ANIMATIONS & UTILITIES
   ============================================ */

/* Fade-in animation for sections */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth transitions for theme switching */
* {
    transition: background-color var(--transition-fast), 
                border-color var(--transition-fast),
                color var(--transition-fast);
}

/* Accessibility - Focus styles */
a:focus, button:focus, select:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header,
    .theme-toggle,
    .language-selector {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* ============================================
   BURGER MENU
   ============================================ */

.burger-menu {
    display: none; /* Hidden by default, shown on mobile */
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    transition: all var(--transition-fast);
    position: relative;
}

.burger-menu:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

/* Burger icon - simple icon swap, no animation */
.burger-icon,
.close-icon {
    width: 20px;
    height: 20px;
    stroke: var(--text-primary);
    position: absolute;
    transition: opacity 0.15s ease;
}

.burger-icon {
    opacity: 1;
}

.close-icon {
    opacity: 0;
}

.burger-menu.active .burger-icon {
    opacity: 0;
}

.burger-menu.active .close-icon {
    opacity: 1;
}

/* ============================================
   MOBILE MENU (BOTTOM SHEET)
   ============================================ */

/* Mobile menu - slides down from top */
.mobile-menu {
    display: none; /* Hidden on desktop */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    pointer-events: none;
}

.mobile-menu.active {
    pointer-events: all;
}

.mobile-menu-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0px);
    transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

.mobile-menu.active .mobile-menu-overlay {
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.mobile-menu-content {
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    max-height: calc(100vh - var(--header-height));
    background: var(--bg-secondary);
    border-radius: 0 0 20px 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    padding: 0;
    transform: translateY(-100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}

.mobile-menu.active .mobile-menu-content {
    transform: translateY(0);
}

.mobile-menu-nav {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 20px 20px 16px;
}

.mobile-menu-link {
    display: block;
    padding: 16px 12px;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.2s ease;
}

.mobile-menu-link:hover,
.mobile-menu-link:active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.mobile-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 16px 20px;
}

.mobile-menu-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 0 20px 24px;
}

.mobile-menu-control {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mobile-control-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mobile-select {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mobile-select:hover,
.mobile-select:focus {
    border-color: var(--accent-primary);
    outline: none;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */

#projects {
    padding: 6rem 2rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.project-image-wrapper {
    position: relative;
    width: 100%;
    padding-top: 60%; /* 5:3 aspect ratio */
    overflow: hidden;
    background: var(--bg-tertiary);
}

.project-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.project-card:hover .project-image {
    transform: scale(1.08);
}

.project-category {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 6px 14px;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-header {
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.project-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.project-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    flex: 1;
}

.project-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 1rem;
}

.stack-tag {
    padding: 4px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.project-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.project-links {
    display: flex;
    gap: 12px;
}

.project-link {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.read-more-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition-fast);
}

.read-more-link:hover {
    gap: 8px;
}

/* ============================================
   PROJECT MODAL
   ============================================ */

.project-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.project-modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    cursor: pointer;
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 20px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 2;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: 2rem;
}

/* ============================================
   TIMELINE LOGO SLOTS
   ============================================ */

.timeline-logo {
    width: 52px;
    height: 52px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-right: 16px;
    transition: all var(--transition-fast);
}

.timeline-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 4px;
}

.logo-placeholder {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-tertiary);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Improve timeline spacing */
.timeline-item {
    position: relative;
    padding-left: 50px;
}

.timeline-item::before {
    left: 16px;
}

.timeline-content {
    position: relative;
    width: 100%;
}

/* ============================================
   THEME TOGGLE ICON IMPROVEMENTS
   ============================================ */

/* Ensure theme toggle icons are visible in both themes */
.theme-toggle svg {
    stroke: var(--text-primary);
    transition: stroke var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle:hover svg {
    transform: rotate(20deg);
}

/* Light theme - sun icon should be visible */
[data-theme="light"] .theme-toggle svg {
    stroke: var(--text-primary);
}

/* Dark theme - moon icon should be visible */
[data-theme="dark"] .theme-toggle svg {
    stroke: var(--text-primary);
}

/* ============================================
   MOBILE RESPONSIVE STYLES
   ============================================ */

@media (max-width: 768px) {
    /* Root adjustments */
    :root {
        --header-height: 64px;
        --spacing-md: 16px;
        --spacing-lg: 32px;
    }
    
    /* Hide desktop-only elements */
    .desktop-only:not(.theme-toggle-mobile) {
        display: none !important;
    }
    
    /* Show mobile elements */
    .burger-menu {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .theme-toggle-mobile {
        display: flex !important;
    }
    
    /* Header adjustments */
    .header {
        padding: 0 1rem;
        height: var(--header-height);
    }
    
    .nav-wrapper {
        height: var(--header-height);
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .header-controls {
        gap: 10px;
        justify-content: flex-end;
    }
    
    /* Hero section spacing */
    .hero {
        padding-top: calc(var(--header-height) + 2rem);
    }
    
    /* Container width optimization */
    .container {
        padding: 0 1.25rem;
        max-width: 100%;
    }
    
    /* Projects grid - single column on mobile */
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 0 1rem;
    }
    
    /* Project cards - adjust for mobile */
    .project-card {
        max-width: 100%;
    }
    
    .project-image-wrapper {
        padding-top: 65%; /* Slightly taller on mobile */
    }
    
    /* Timeline adjustments */
    .timeline-item {
        padding-left: 32px;
    }
    
    .timeline-card {
        padding: 1rem;
        flex-direction: column;
    }
    
    .timeline-logo {
        width: 44px;
        height: 44px;
        margin-right: 0;
        margin-bottom: 12px;
    }
    
    .logo-placeholder {
        font-size: 0.95rem;
    }
    
    .timeline-header {
        flex-direction: column;
        gap: 8px;
    }
    
    .timeline-date {
        align-self: flex-start;
    }
    
    /* Modal adjustments */
    .modal-content {
        margin: 0 10px;
        max-height: 95vh;
    }
    
    .modal-body {
        padding: 1.5rem;
    }
    
    .modal-close {
        top: 12px;
        right: 12px;
        width: 36px;
        height: 36px;
    }
    
    /* Section title */
    .section-title {
        font-size: 2rem;
    }
    
    /* Skills grid */
    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 1rem;
    }
    
    /* Languages grid */
    .languages-grid {
        grid-template-columns: 1fr;
    }
}

/* Tablet adjustments */
@media (min-width: 769px) and (max-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.75rem;
    }
}

/* Prevent body scroll when bottom sheet / modal is open */
body.scroll-locked {
    overflow: hidden;
    position: fixed;
    width: 100%;
}