/* ==========================================================================
   DESIGN SYSTEM & CUSTOM VARIABLES (DARK/LIGHT THEME)
   ========================================================================== */
:root {
    /* Color Tokens - Dark Mode (Default) */
    --color-bg-h: 230;
    --color-bg-s: 28%;
    --color-bg-l: 5%;
    --color-bg: hsl(var(--color-bg-h), var(--color-bg-s), var(--color-bg-l));
    
    --color-surface-h: 230;
    --color-surface-s: 25%;
    --color-surface-l: 9%;
    --color-surface: hsl(var(--color-surface-h), var(--color-surface-s), var(--color-surface-l));
    
    --color-surface-elevated: hsl(var(--color-surface-h), var(--color-surface-s), 14%);
    
    --color-primary: #00f2fe;      /* Vibrant Cyan */
    --color-secondary: #8a2be2;    /* Electric Violet */
    --color-accent-copper: #ff7a00; /* Hardware Copper/Orange */
    
    --color-text-h: 215;
    --color-text-s: 20%;
    --color-text-l: 90%;
    --color-text: hsl(var(--color-text-h), var(--color-text-s), var(--color-text-l));
    
    --color-text-dim: hsl(var(--color-text-h), 16%, 62%);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-glow: rgba(0, 242, 254, 0.2);
    --color-shadow: rgba(0, 0, 0, 0.5);
    
    /* Gradients */
    --grad-soft: linear-gradient(135deg, var(--color-primary) 0%, #4facfe 100%);
    --grad-design: linear-gradient(135deg, var(--color-secondary) 0%, #da70d6 100%);
    --grad-hard: linear-gradient(135deg, var(--color-accent-copper) 0%, #ff007f 100%);
    
    /* Layout Constants */
    --header-height: 80px;
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --container-max-width: 1200px;
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides */
body.light-mode {
    --color-bg-h: 220;
    --color-bg-s: 20%;
    --color-bg-l: 96%;
    --color-bg: hsl(var(--color-bg-h), var(--color-bg-s), var(--color-bg-l));
    
    --color-surface-h: 0;
    --color-surface-s: 0%;
    --color-surface-l: 100%;
    --color-surface: hsl(var(--color-surface-h), var(--color-surface-s), var(--color-surface-l));
    
    --color-surface-elevated: hsl(var(--color-bg-h), 15%, 90%);
    
    --color-primary: #008fa0;      /* Darker Cyan for legibility */
    --color-secondary: #7415cc;    /* Darker Violet */
    --color-accent-copper: #d35400; /* Darker copper */
    
    --color-text-h: 217;
    --color-text-s: 33%;
    --color-text-l: 17%;
    --color-text: hsl(var(--color-text-h), var(--color-text-s), var(--color-text-l));
    
    --color-text-dim: hsl(var(--color-text-h), 16%, 45%);
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-glow: rgba(0, 143, 160, 0.25);
    --color-shadow: rgba(0, 0, 0, 0.08);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

#circuitCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    opacity: 0.85;
}

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

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
    background: var(--color-surface-elevated);
    border-radius: 5px;
    border: 2px solid var(--color-bg);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* Typography Helpers */
a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

strong {
    color: var(--color-primary);
}

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.25;
}

/* ==========================================================================
   GLOBAL COMPONENTS & GLASSMORPHISM
   ========================================================================== */
.glass-card {
    background: rgba(var(--color-surface-h) == 230 ? 17 : 255, 
                   var(--color-surface-h) == 230 ? 19 : 255, 
                   var(--color-surface-h) == 230 ? 28 : 255, 
                   0.65);
    backdrop-filter: blur(12px) saturate(160%);
    -webkit-backdrop-filter: blur(12px) saturate(160%);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    transition: var(--transition-smooth);
    box-shadow: 0 8px 32px var(--color-shadow);
}

.glass-card:hover {
    border-color: var(--color-border-glow);
    box-shadow: 0 12px 40px rgba(0, 242, 254, 0.08);
    transform: translateY(-4px);
}

.gradient-text-soft {
    background: var(--grad-soft);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

.gradient-text-design {
    background: var(--grad-design);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

.gradient-text-hard {
    background: var(--grad-hard);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-smooth);
    gap: 8px;
}

.btn-primary {
    background: var(--grad-soft);
    color: #050508;
    border: none;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.55);
    transform: scale(1.02);
}

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    background: rgba(0, 242, 254, 0.05);
    color: var(--color-primary);
}

.btn-small {
    padding: 6px 14px;
    font-size: 13px;
    border-radius: 4px;
}

.btn-arrow {
    transition: var(--transition-smooth);
}
.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* Sections Header */
.section-header {
    margin-bottom: 48px;
    position: relative;
}

.section-pre {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-accent-copper);
    letter-spacing: 2px;
    display: block;
    margin-bottom: 8px;
}

.section-title {
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 800;
    color: var(--color-text);
}

.section-line {
    width: 60px;
    height: 4px;
    background: var(--grad-soft);
    margin-top: 12px;
    border-radius: 2px;
}

.section-desc-para {
    color: var(--color-text-dim);
    font-size: 17px;
    max-width: 650px;
    margin-top: -24px;
    margin-bottom: 40px;
}

/* ==========================================================================
   HEADER / NAVIGATION
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: hsla(var(--color-bg-h), var(--color-bg-s), var(--color-bg-l), 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition-smooth);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 20px;
}
.logo-icon {
    font-family: var(--font-mono);
    color: var(--color-primary);
}
.logo-text {
    letter-spacing: -0.5px;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-dim);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--grad-soft);
    transition: var(--transition-smooth);
}

.nav-link:hover, .nav-link.active {
    color: var(--color-text);
}
.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.theme-toggle-btn {
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.sun-icon { display: block; }
.moon-icon { display: none; }

body.light-mode .sun-icon { display: none; }
body.light-mode .moon-icon { display: block; }

.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1100;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background-color 0.3s;
}

.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    left: 0;
    transition: transform 0.3s, top 0.3s;
}
.hamburger::before { top: -6px; }
.hamburger::after { top: 6px; }

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--header-height) + 40px);
    position: relative;
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    max-width: 850px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 242, 254, 0.08);
    border: 1px solid rgba(0, 242, 254, 0.15);
    padding: 6px 14px;
    border-radius: 30px;
    font-size: 13px;
    font-family: var(--font-mono);
    color: var(--color-primary);
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-primary);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--color-primary);
    animation: pulseGlow 2s infinite;
}

.hero-title {
    font-size: clamp(40px, 7vw, 76px);
    font-weight: 800;
    letter-spacing: -2px;
    color: var(--color-text);
    line-height: 1.1;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: clamp(20px, 3.5vw, 32px);
    font-weight: 500;
    margin-bottom: 24px;
    color: var(--color-text-dim);
}

.hero-description {
    font-size: clamp(16px, 1.8vw, 19px);
    color: var(--color-text-dim);
    margin-bottom: 40px;
    max-width: 700px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    opacity: 0.6;
}

.mouse-wheel {
    width: 20px;
    height: 32px;
    border: 2px solid var(--color-text-dim);
    border-radius: 12px;
    position: relative;
}

.mouse-wheel::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 2px;
    animation: scrollMouse 1.8s infinite;
}

.scroll-text {
    font-size: 12px;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ==========================================================================
   ABOUT / IDENTITY SECTION
   ========================================================================== */
.about-section {
    padding: 100px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 64px;
    align-items: center;
}

.about-intro {
    font-size: 19px;
    color: var(--color-text);
    margin-bottom: 20px;
}

.about-text-content p {
    color: var(--color-text-dim);
    margin-bottom: 20px;
    font-size: 16px;
}

.identity-highlights {
    display: flex;
    gap: 40px;
    margin-top: 40px;
    border-top: 1px solid var(--color-border);
    padding-top: 30px;
}

.highlight-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-primary);
    display: block;
}

.highlight-label {
    font-size: 13px;
    color: var(--color-text-dim);
    font-family: var(--font-mono);
}

.identity-card {
    padding: 32px;
    position: relative;
    overflow: hidden;
}

.avatar-wrapper {
    width: 140px;
    height: 140px;
    margin: 0 auto 24px auto;
}

.avatar-svg {
    width: 100%;
    height: 100%;
}

.card-name {
    text-align: center;
    font-size: 22px;
    margin-bottom: 4px;
}

.card-title {
    text-align: center;
    font-family: var(--font-mono);
    color: var(--color-accent-copper);
    font-size: 14px;
    margin-bottom: 32px;
}

.card-meta {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.card-meta li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--color-text-dim);
}

.meta-icon {
    font-size: 16px;
}

/* Quote Box & Emphasis Layouts */
.hero-description.emphasis-text {
    font-size: clamp(17px, 2vw, 21px);
    line-height: 1.65;
    color: var(--color-text);
    font-weight: 500;
    border-left: 3px solid var(--color-primary);
    padding-left: 20px;
    margin-bottom: 40px;
    max-width: 780px;
}

body.light-mode .hero-description.emphasis-text {
    border-left-color: var(--color-primary);
}

.about-quote-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-accent-copper);
    padding: 24px 28px;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    margin-bottom: 32px;
    box-shadow: 0 4px 20px var(--color-shadow);
    backdrop-filter: blur(8px);
}

body.light-mode .about-quote-box {
    background: rgba(0, 0, 0, 0.02);
}

.about-quote-text {
    font-size: 17px !important;
    line-height: 1.65 !important;
    font-weight: 500;
    color: var(--color-text) !important;
    font-style: italic;
    margin: 0 !important;
}

/* ==========================================================================
   SKILLS / EXPERTISE SECTION
   ========================================================================== */
.skills-section {
    padding: 100px 0;
}

.tabs-nav {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
    border-bottom: 1.5px solid var(--color-border);
    padding-bottom: 16px;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--color-text-dim);
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-smooth);
}

.tab-btn:hover {
    color: var(--color-primary);
    background-color: rgba(0, 242, 254, 0.05);
}

.tab-btn.active {
    color: var(--color-bg);
    background: var(--grad-soft);
}

.tab-btn.active .tab-icon {
    filter: brightness(0);
}

/* Tab Content Panes */
.tab-pane {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.tab-pane.active {
    display: block;
}

.tab-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.tab-text-info h3 {
    font-size: 24px;
    margin-bottom: 16px;
}

.tab-text-info p {
    color: var(--color-text-dim);
    margin-bottom: 24px;
}

.skills-bullets {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.skills-bullets li {
    position: relative;
    padding-left: 20px;
    color: var(--color-text);
}

.skills-bullets li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-size: 10px;
    top: 4px;
}

.tech-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tech-chip {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 10px 18px;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 4px 12px var(--color-shadow);
    transition: var(--transition-smooth);
}

.tech-chip:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.15);
}

/* Custom chips coloring for categories */
.tech-chip.hardware:hover {
    border-color: var(--color-accent-copper);
    box-shadow: 0 0 15px rgba(255, 122, 0, 0.15);
}

.tech-chip.design:hover {
    border-color: var(--color-secondary);
    box-shadow: 0 0 15px rgba(138, 43, 226, 0.15);
}

/* ==========================================================================
   EXPERIENCE / TIMELINE SECTION
   ========================================================================== */
.experience-section {
    padding: 100px 0;
}

.timeline-container {
    position: relative;
    max-width: 800px;
    margin: 40px auto 0 auto;
    padding-left: 32px;
    border-left: 2px solid var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

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

.timeline-dot {
    position: absolute;
    left: -41px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--color-bg);
    border: 3px solid var(--color-primary);
    box-shadow: 0 0 10px var(--color-primary);
    transition: var(--transition-smooth);
    z-index: 10;
}

.timeline-item:hover .timeline-dot {
    background-color: var(--color-primary);
    transform: scale(1.2);
    box-shadow: 0 0 15px var(--color-primary);
}

.timeline-header {
    margin-bottom: 16px;
}

.timeline-period {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    color: var(--color-accent-copper);
    background: rgba(255, 122, 0, 0.08);
    border: 1px solid rgba(255, 122, 0, 0.15);
    padding: 4px 10px;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 8px;
}

body.light-mode .timeline-period {
    background: rgba(211, 84, 0, 0.08);
    border-color: rgba(211, 84, 0, 0.15);
}

.timeline-role {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
}

.timeline-company {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-dim);
    font-family: var(--font-mono);
}

.timeline-body ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.timeline-body li {
    position: relative;
    padding-left: 20px;
    font-size: 15px;
    color: var(--color-text-dim);
}

.timeline-body li::before {
    content: '▪';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-size: 12px;
    top: -1px;
}

/* ==========================================================================
   PROJECTS SECTION
   ========================================================================== */
.projects-section {
    padding: 100px 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
}

.project-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.project-image-wrapper {
    height: 200px;
    position: relative;
    overflow: hidden;
    background: var(--color-surface-elevated);
    border-bottom: 1.5px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-icon-glow {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    filter: blur(40px);
    opacity: 0.15;
    z-index: 1;
}

.project-icon-glow.tech { background-color: var(--color-primary); }
.project-icon-glow.hardware { background-color: var(--color-accent-copper); }
.project-icon-glow.business { background-color: var(--color-secondary); }

.project-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid var(--color-border);
    padding: 4px 10px;
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-dim);
    z-index: 10;
}

/* Simulated UIs inside Cards */
.project-visual-sim {
    width: 80%;
    height: 70%;
    border-radius: var(--border-radius-sm);
    z-index: 2;
    transition: var(--transition-smooth);
}

.project-card:hover .project-visual-sim {
    transform: scale(1.05);
}

/* YouTube Calculator UI Mockup */
.project-visual-sim.calc-screen {
    background: #0f1015;
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 16px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 12px;
}

.sim-label { color: var(--color-text-dim); }
.sim-val { color: var(--color-primary); font-weight: 700; }
.sim-bar {
    width: 100%;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}
.sim-bar .fill {
    height: 100%;
    background: var(--grad-soft);
}

/* Terminal Mockup */
.project-visual-sim.code-terminal {
    background: #08090d;
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 11px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    justify-content: center;
}

.term-line { color: var(--color-text-dim); }
.term-line.green { color: #50fa7b; }
.term-line.dim { color: rgba(148, 163, 184, 0.5); }

/* Process Simulator mockup */
.project-visual-sim.process-sim {
    background: radial-gradient(circle at center, #1b0a2d 0%, #0a0512 100%);
    border: 1px solid rgba(138, 43, 226, 0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.process-logo {
    width: 44px;
    height: 44px;
    background: var(--grad-design);
    color: #ffffff;
    font-weight: 800;
    font-size: 22px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px var(--color-secondary);
}

.process-sim .sim-text {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 12px;
    color: var(--color-text-dim);
}

/* Project Card content */
.project-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-card-title {
    font-size: 20px;
    margin-bottom: 12px;
}

.project-card-desc {
    font-size: 14px;
    color: var(--color-text-dim);
    margin-bottom: 24px;
    flex-grow: 1;
}

.project-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.project-tech-tags span {
    font-family: var(--font-mono);
    font-size: 11px;
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 3px 8px;
    border-radius: 4px;
    color: var(--color-text-dim);
}

body.light-mode .project-tech-tags span {
    background-color: rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.project-links {
    margin-top: auto;
    border-top: 1px solid var(--color-border);
    padding-top: 16px;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
}

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

/* ==========================================================================
   DEV PLAYGROUND SECTION
   ========================================================================== */
.playground-section {
    padding: 100px 0;
}

.playground-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 32px;
}

.playground-card {
    padding: 32px;
    display: flex;
    flex-direction: column;
}

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

.widget-badge {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    background-color: rgba(255, 255, 255, 0.08);
}
.widget-badge.design { color: var(--color-primary); background-color: rgba(0, 242, 254, 0.08); }
.widget-badge.hardware { color: var(--color-accent-copper); background-color: rgba(255, 122, 0, 0.08); }

.widget-desc {
    font-size: 14px;
    color: var(--color-text-dim);
    margin-bottom: 24px;
}

/* Lab 1: Gradient Preview & Code copy */
.gradient-preview {
    height: 160px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 24px;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.2);
    border: 1px solid var(--color-border);
}

.widget-controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.control-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.control-row label {
    font-size: 14px;
    font-weight: 500;
}

.control-row span {
    font-family: var(--font-mono);
    color: var(--color-primary);
    font-size: 13px;
}

.control-row input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 48px;
    height: 30px;
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
}
.control-row input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}
.control-row input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--color-border);
    border-radius: 6px;
}

.control-row input[type="range"] {
    flex-grow: 1;
    max-width: 150px;
    accent-color: var(--color-primary);
    height: 4px;
    border-radius: 2px;
}

.code-copy-container {
    background: #0f1015;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: auto;
}

body.light-mode .code-copy-container {
    background: #f1f3f7;
}

.code-copy-container code {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-text-dim);
    word-break: break-all;
}

/* Lab 2: Interactive Circuit LED Board */
.circuit-board {
    background-color: #171c26;
    border: 2px solid #232a38;
    border-radius: var(--border-radius-sm);
    height: 160px;
    margin-bottom: 24px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    box-shadow: inset 0 4px 15px rgba(0,0,0,0.3);
}

.mcu-chip {
    background: #2b3547;
    border: 1.5px solid #3c4962;
    border-radius: 4px;
    width: 90px;
    padding: 10px 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.chip-name {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 11px;
    color: #ffffff;
    margin: 4px 0;
}

.chip-pin {
    font-family: var(--font-mono);
    font-size: 8px;
    color: #94a3b8;
    background: #171c26;
    padding: 1px 4px;
    border-radius: 2px;
    width: 90%;
    text-align: center;
}

.chip-pin.green-pin {
    color: #00f2fe;
    font-weight: bold;
}

.wire {
    height: 2px;
    position: absolute;
    background-color: #2b3547;
    z-index: 1;
}

.wire-positive {
    background-color: #ff3e3e; /* Red Wire */
    width: 100px;
    top: 50%;
    left: 124px;
    box-shadow: 0 0 4px rgba(255, 62, 62, 0.4);
    transition: var(--transition-smooth);
}

.wire-positive.active {
    box-shadow: 0 0 10px #ff3e3e;
}

.virtual-led-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 2;
}

.led-light {
    width: 24px;
    height: 24px;
    background-color: #334155; /* Off state */
    border-radius: 50% 50% 45% 45%;
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    box-shadow: inset 0 2px 5px rgba(255,255,255,0.1);
    transition: var(--transition-smooth);
}

.led-light::before {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    top: 4px;
    left: 6px;
}

/* Active LED state */
.led-light.active {
    background-color: var(--color-primary);
    box-shadow: 0 0 25px var(--color-primary), inset 0 1px 5px rgba(255,255,255,0.4);
}

.led-label {
    font-family: var(--font-mono);
    font-size: 10px;
    color: #94a3b8;
}

.terminal-logs-box {
    background: #08090d;
    border: 1.5px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    height: 100px;
    padding: 12px 16px;
    font-family: var(--font-mono);
    font-size: 11px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.log-entry {
    color: #a1a1aa;
}
.log-entry.system { color: #f43f5e; }
.log-entry.io { color: #38bdf8; }
.log-entry.output { color: #4ade80; }

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-section {
    padding: 100px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 64px;
    align-items: flex-start;
}

.contact-info-panel h3 {
    font-size: 26px;
    margin-bottom: 16px;
}

.contact-info-panel p {
    color: var(--color-text-dim);
    font-size: 16px;
    margin-bottom: 40px;
}

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

.contact-meta-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.c-icon {
    font-size: 24px;
    background: var(--color-surface-elevated);
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px var(--color-shadow);
}

.c-text {
    display: flex;
    flex-direction: column;
}

.c-label {
    font-size: 12px;
    font-family: var(--font-mono);
    color: var(--color-text-dim);
    margin-bottom: 4px;
}

.c-link {
    color: var(--color-primary);
    font-weight: 600;
}
.c-link:hover {
    color: var(--color-text);
}

.c-val {
    font-weight: 600;
}

/* Contact Form UI */
.contact-form-panel {
    padding: 40px;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 24px;
}

.form-group label {
    font-size: 13px;
    font-family: var(--font-mono);
    color: var(--color-text-dim);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input, .form-group textarea {
    background: hsla(var(--color-surface-h), var(--color-surface-s), 5%, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    padding: 12px 16px;
    font-family: var(--font-sans);
    color: var(--color-text);
    font-size: 15px;
    transition: var(--transition-smooth);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.15);
    background: var(--color-surface);
}

.form-status-msg {
    margin-top: 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    height: 20px;
}

.form-status-msg.success { color: #4ade80; }
.form-status-msg.error { color: #f43f5e; }

/* ==========================================================================
   FOOTER SECTION
   ========================================================================== */
.footer {
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
    background: hsla(var(--color-bg-h), var(--color-bg-s), var(--color-bg-l), 0.9);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left p {
    font-size: 14px;
    color: var(--color-text-dim);
    margin-bottom: 4px;
}

.footer-domain-note a {
    color: var(--color-accent-copper);
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background-color: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-dim);
    box-shadow: 0 4px 10px var(--color-shadow);
}

.social-links a:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

/* ==========================================================================
   KEYFRAME ANIMATIONS
   ========================================================================== */
@keyframes pulseGlow {
    0% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(0, 242, 254, 0.4); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(0, 242, 254, 0); }
    100% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(0, 242, 254, 0); }
}

@keyframes scrollMouse {
    0% { opacity: 0; transform: translate(-50%, 0); }
    40% { opacity: 1; }
    80% { opacity: 0; transform: translate(-50%, 8px); }
    100% { opacity: 0; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   RESPONSIVE DESIGN BREAKPOINTS
   ========================================================================== */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-graphic-container {
        max-width: 450px;
        margin: 0 auto;
        width: 100%;
    }
    
    .playground-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: calc(100vh - var(--header-height));
        background: hsla(var(--color-surface-h), var(--color-surface-s), var(--color-surface-l), 0.98);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-left: 1px solid var(--color-border);
        transition: var(--transition-smooth);
        padding: 40px;
        z-index: 1050;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 24px;
    }
    
    .nav-link {
        font-size: 18px;
    }
    
    /* Toggle icon morph */
    .nav-toggle.active .hamburger {
        background-color: transparent;
    }
    .nav-toggle.active .hamburger::before {
        transform: rotate(45deg);
        top: 0;
    }
    .nav-toggle.active .hamburger::after {
        transform: rotate(-45deg);
        top: 0;
    }
    
    .tab-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .tabs-nav {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .tab-btn {
        flex-grow: 1;
        justify-content: center;
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    .hero-actions .btn {
        width: 100%;
    }
    
    .identity-highlights {
        flex-direction: column;
        gap: 20px;
    }
    
    .contact-form-panel {
        padding: 24px;
    }
}

/* Checklist Card Visual Sim */
.project-visual-sim.checklist-preview {
    background: #0f1015;
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 16px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 11px;
}

body.light-mode .project-visual-sim.checklist-preview {
    background: #f1f3f7;
}

.checklist-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text-dim);
}

.checklist-item .checked-box {
    color: var(--color-primary);
    font-weight: bold;
}

.checklist-item .empty-box {
    display: inline-block;
    width: 10px;
    height: 10px;
    border: 1px solid var(--color-text-dim);
    border-radius: 2px;
}