/* ==========================================================================
   Design System & Tokens (CSS Variables)
   ========================================================================== */
:root {
    /* Fonts */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Theme colors: Dark Theme (Default) */
    --bg-color: #0b0f19;
    --bg-canvas: #070a13;
    --surface-color: rgba(22, 28, 45, 0.7);
    --surface-hover: rgba(30, 38, 59, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(79, 70, 229, 0.4);
    
    --primary: #4f46e5;
    --primary-rgb: 79, 70, 229;
    --primary-hover: #6366f1;
    --accent: #06b6d4;
    --accent-rgb: 6, 182, 212;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-inverse: #0f172a;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px rgba(79, 70, 229, 0.25);
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    --glass-bg: rgba(15, 23, 42, 0.65);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    --container-width: 1200px;
    --header-height: 80px;
}

[data-theme="light"] {
    /* Theme colors: Light Theme */
    --bg-color: #f8fafc;
    --bg-canvas: #f1f5f9;
    --surface-color: rgba(255, 255, 255, 0.8);
    --surface-hover: rgba(255, 255, 255, 0.95);
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(79, 70, 229, 0.3);
    
    --primary: #4f46e5;
    --primary-rgb: 79, 70, 229;
    --primary-hover: #3730a3;
    --accent: #0891b2;
    --accent-rgb: 8, 145, 178;
    
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-inverse: #f8fafc;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 25px rgba(79, 70, 229, 0.15);
    
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(0, 0, 0, 0.06);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    max-width: 100%;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Interactive Canvas Background */
#canvas-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    background-color: var(--bg-canvas);
    transition: background-color var(--transition-normal);
}

/* Utility Containers */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section-padding {
    padding: 100px 0;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* ==========================================================================
   Typography & Buttons
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-main);
}

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

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.badge {
    display: inline-block;
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 50px;
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
    border: 1px solid rgba(79, 70, 229, 0.2);
    margin-bottom: 20px;
}

/* Button styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    outline: none;
}

.btn-icon {
    margin-left: 8px;
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow), var(--shadow-md);
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1.5px solid var(--border-color);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--primary);
    transform: translateY(-2px);
}

[data-theme="light"] .btn-outline:hover {
    background: rgba(0, 0, 0, 0.02);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* ==========================================================================
   Header & Navigation (Glassmorphic)
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.4rem;
    font-family: var(--font-heading);
    letter-spacing: -0.5px;
}

.logo-symbol {
    color: var(--accent);
    font-weight: 900;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width var(--transition-normal);
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-main);
    transition: all var(--transition-normal);
}

.theme-toggle-btn:hover {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.08);
}

/* Toggle icon display based on active theme */
.sun-icon {
    display: none;
}
.moon-icon {
    display: block;
}

[data-theme="light"] .sun-icon {
    display: block;
}
[data-theme="light"] .moon-icon {
    display: none;
}

/* Mobile Nav Toggle (Hamburger) */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1100;
}

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

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

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

/* Open Mobile Menu Animations */
.mobile-nav-toggle.open .hamburger {
    background: transparent;
}
.mobile-nav-toggle.open .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}
.mobile-nav-toggle.open .hamburger::after {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-width: 0;
    width: 100%;
}

.hero-content {
    max-width: 780px;
    min-width: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 20px;
    overflow-wrap: break-word;
    word-break: break-word;
}

.hero-subtitle {
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    color: var(--text-muted);
    margin-bottom: 36px;
    max-width: 680px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Code mockup visualization card */
.hero-visual {
    display: flex;
    justify-content: flex-end;
    min-width: 0;
    width: 100%;
}

.visual-card {
    position: relative;
    width: 100%;
    max-width: 420px;
    min-width: 0;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    backdrop-filter: blur(8px);
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.visual-card:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--border-hover);
}

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(79,70,229,0.06) 0%, transparent 60%);
    pointer-events: none;
}

.code-header {
    background: rgba(30, 41, 59, 0.4);
    padding: 12px 18px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 8px;
}

.dot.red { background-color: #ef4444; }
.dot.yellow { background-color: #f59e0b; }
.dot.green { background-color: #10b981; }

.code-title {
    margin-left: 8px;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.code-body,
.visual-card,
.code-body code {
    padding: 24px;
    font-family: 'Consolas', 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    color: #e2e8f0;
    overflow-x: auto;
    max-width: 100%;
    margin: 0;
    text-align: left !important;
}

/* Syntax Highlighting */
.keyword { color: #f43f5e; }
.string { color: #10b981; }
.function { color: #38bdf8; }
.number { color: #fbbf24; }

/* Scroll mouse indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    justify-content: center;
}

.mouse {
    width: 28px;
    height: 48px;
    border: 2px solid var(--text-muted);
    border-radius: 20px;
    position: relative;
    opacity: 0.7;
}

.wheel {
    width: 6px;
    height: 6px;
    background-color: var(--primary);
    border-radius: 50%;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollMouse 1.8s infinite;
}

@keyframes scrollMouse {
    0% {
        top: 8px;
        opacity: 1;
    }
    100% {
        top: 24px;
        opacity: 0;
    }
}

/* ==========================================================================
   Sections Common Components
   ========================================================================== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.section-divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    margin: 0 auto;
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
    min-width: 0;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.personal-info {
    margin-top: 36px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.info-item {
    display: flex;
    gap: 12px;
    font-size: 0.95rem;
}

.info-label {
    font-weight: 600;
    color: var(--text-main);
    min-width: 140px;
}

.info-val {
    color: var(--text-muted);
    overflow-wrap: anywhere;
    word-break: break-word;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.stat-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px 24px;
    text-align: center;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    background: var(--surface-hover);
}

.stat-num {
    display: block;
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 10px;
}

.stat-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ==========================================================================
   Skills Section
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    min-width: 0;
}

.skills-category {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all var(--transition-normal);
}

.skills-category:hover {
    border-color: var(--border-hover);
    background: var(--surface-hover);
    box-shadow: var(--shadow-md);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
}

.category-icon {
    width: 28px;
    height: 28px;
    color: var(--accent);
}

.category-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.skills-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-name {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.skill-name span:first-child {
    color: var(--text-main);
}

.percentage {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
}

[data-theme="light"] .progress-bar {
    background: rgba(0, 0, 0, 0.05);
}

.progress {
    height: 100%;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    transition: width var(--transition-slow);
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.projects-filter {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 10px 24px;
    border-radius: 50px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--text-main);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    min-width: 0;
}

.project-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
    background: var(--surface-hover);
}

.project-img-container {
    height: 180px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(6, 182, 212, 0.08) 100%);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: background var(--transition-normal);
}

.project-card:hover .project-img-container {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
}

.project-icon-placeholder {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-normal);
}

[data-theme="light"] .project-icon-placeholder {
    background: rgba(0, 0, 0, 0.02);
    border-color: rgba(0, 0, 0, 0.08);
}

.project-card:hover .project-icon-placeholder {
    transform: scale(1.1) rotate(5deg);
    border-color: var(--primary);
}

.proj-icon {
    width: 32px;
    height: 32px;
    color: var(--accent);
}

.project-tag {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(79, 70, 229, 0.15);
    border: 1px solid rgba(79, 70, 229, 0.3);
    color: var(--primary);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.project-info-body {
    padding: 30px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.project-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 24px;
    flex-grow: 1;
    line-height: 1.5;
}

.project-skills {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.skill-tag {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

[data-theme="light"] .skill-tag {
    background: rgba(0, 0, 0, 0.03);
}

.project-links {
    margin-top: auto;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 18px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.01);
}

.project-link:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.05);
}

.project-link svg {
    width: 16px;
    height: 16px;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 60px;
    align-items: start;
    min-width: 0;
}

.contact-intro {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.method-item {
    display: flex;
    align-items: center;
    gap: 20px;
}

.method-icon-container {
    width: 52px;
    height: 52px;
    background: rgba(79, 70, 229, 0.1);
    border: 1px solid rgba(79, 70, 229, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.method-icon-container svg {
    width: 24px;
    height: 24px;
}

.method-item h4 {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.method-link {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-main);
    overflow-wrap: anywhere;
    word-break: break-word;
}

.method-link:hover {
    color: var(--primary);
}

.contact-form-container {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.form-group input, .form-group textarea {
    background: rgba(255, 255, 255, 0.02);
    border: 1.5px solid var(--border-color);
    color: var(--text-main);
    padding: 12px 16px;
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: all var(--transition-normal);
}

[data-theme="light"] .form-group input, [data-theme="light"] .form-group textarea {
    background: rgba(0, 0, 0, 0.01);
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    background: rgba(255, 255, 255, 0.04);
}

.form-status {
    margin-top: 16px;
    font-size: 0.95rem;
    text-align: center;
    border-radius: 8px;
    transition: all var(--transition-normal);
}

.form-status.success {
    padding: 12px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.form-status.error {
    padding: 12px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    background: rgba(7, 10, 19, 0.8);
    transition: background-color var(--transition-normal);
}

[data-theme="light"] .footer {
    background: #e2e8f0;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-tagline {
    font-weight: 500;
}

/* ==========================================================================
   Timeline Section (Experience & Education)
   ========================================================================== */
.timeline-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
    min-width: 0;
}

.timeline-col {
    display: flex;
    flex-direction: column;
}

.col-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
}

.timeline-items {
    border-left: 2px solid var(--border-color);
    padding-left: 28px;
    position: relative;
    margin-left: 10px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.timeline-item {
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -35px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-color);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
    transition: all var(--transition-normal);
}

.timeline-item:hover::before {
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(79, 70, 229, 0.3);
    transform: scale(1.2);
}

.time-period {
    display: inline-block;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 4px;
    margin-bottom: 12px;
}

.item-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.item-subtitle {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    opacity: 0.9;
    margin-bottom: 12px;
}

.item-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .visual-card,
    .code-body,
    .code-body code {
        text-align: left !important;
    }
    
    .hero-content {
        max-width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-visual {
        justify-content: center;
        width: 100%;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .timeline-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .section-padding {
        padding: 60px 0;
    }
    
    .header {
        height: 70px;
    }
    
    /* Navigation layout mobile */
    .mobile-nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-color);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        transition: left var(--transition-normal);
        border-top: 1px solid var(--border-color);
        padding: 20px;
        overflow-y: auto;
    }
    
    .nav-menu.open {
        left: 0;
    }
    
    .nav-link {
        font-size: 1.25rem;
        font-weight: 600;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

    .personal-info {
        gap: 12px;
    }
    
    .info-item {
        flex-direction: column;
        gap: 2px;
    }
    
    .info-label {
        min-width: auto;
    }
    
    .timeline-items {
        padding-left: 20px;
        margin-left: 5px;
    }

    .scroll-indicator {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.85rem;
        letter-spacing: -0.5px;
    }

    .hero-subtitle {
        font-size: 0.95rem;
        margin-bottom: 28px;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
        gap: 12px;
    }
    
    .btn {
        width: 100%;
        padding: 14px 20px;
    }

    .code-body {
        padding: 16px;
        font-size: 0.78rem;
    }

    .contact-form-container {
        padding: 20px 16px;
    }

    .projects-filter {
        gap: 8px;
    }

    .filter-btn {
        padding: 8px 16px;
        font-size: 0.82rem;
    }

    .skills-category {
        padding: 20px 16px;
    }

    .project-info-body {
        padding: 20px 16px;
    }
    
    .stat-card {
        padding: 20px 16px;
    }

    .method-item {
        gap: 14px;
    }

    .method-link {
        font-size: 0.95rem;
    }
}

/* ==========================================================================
   Animations & Transition classes
   ========================================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.hero-content .fade-in:nth-child(1) { animation-delay: 0.1s; }
.hero-content .fade-in:nth-child(2) { animation-delay: 0.3s; }
.hero-content .fade-in:nth-child(3) { animation-delay: 0.5s; }
.hero-content .fade-in:nth-child(4) { animation-delay: 0.7s; }
.hero-visual.fade-in { animation-delay: 0.9s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}