/* ============================================
   CSS Variables - Design System
   ============================================ */
:root {
    /* Colors - High contrast for accessibility */
    --color-primary: #06b6d4;
    --color-primary-dark: #0891b2;
    --color-primary-light: #67e8f9;
    --color-secondary: #10b981;
    --color-accent: #f59e0b;

    --color-primary-rgb: 6, 182, 212;
    --color-secondary-rgb: 16, 185, 129;

    --color-text: #0f172a;
    --color-text-light: #475569;
    --color-text-muted: #64748b;
    --color-bg: #ffffff;
    --color-bg-light: #f1f5f9;
    --color-bg-dark: #111827;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --color-error: #ef4444;

    --color-navbar-bg: rgba(255, 255, 255, 0.95);
    --color-hero-bg-start: #f0f9ff;
    --color-hero-bg-end: #e0f2fe;
    --color-image-ring: #ffffff;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-size-xs: 0.75rem;
    /* 12px */
    --font-size-sm: 0.875rem;
    /* 14px */
    --font-size-base: 1rem;
    /* 16px */
    --font-size-lg: 1.125rem;
    /* 18px */
    --font-size-xl: 1.25rem;
    /* 20px */
    --font-size-2xl: 1.5rem;
    /* 24px */
    --font-size-3xl: 1.875rem;
    /* 30px */
    --font-size-4xl: 2.25rem;
    /* 36px */
    --font-size-5xl: 3rem;
    /* 48px */

    /* Spacing - Consistent 8px grid */
    --spacing-xs: 0.5rem;
    /* 8px */
    --spacing-sm: 1rem;
    /* 16px */
    --spacing-md: 1.5rem;
    /* 24px */
    --spacing-lg: 2rem;
    /* 32px */
    --spacing-xl: 3rem;
    /* 48px */
    --spacing-2xl: 4rem;
    /* 64px */
    --spacing-3xl: 6rem;
    /* 96px */

    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
    --border-radius-sm: 0.5rem;
    --border-radius-md: 0.75rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;

    /* Shadows - Subtle depth */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 0 1px rgba(var(--color-primary-rgb), 0.16), 0 24px 48px -16px rgba(var(--color-primary-rgb), 0.4);

    /* Brand gradient - reused across headings, buttons, accents, hover states */
    --gradient-brand: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);

    /* Transitions - Smooth animations */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;

    /* Z-index layers */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
}

/* ============================================
   Dark Theme
   ============================================ */
html[data-theme="dark"] {
    --color-text: #e5e7eb;
    --color-text-light: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-bg: #0b1220;
    --color-bg-light: #0f1b2d;
    --color-bg-dark: #070f1a;
    --color-border: rgba(255, 255, 255, 0.12);

    --color-navbar-bg: rgba(11, 18, 32, 0.78);
    --color-hero-bg-start: #06141f;
    --color-hero-bg-end: #0b1b2b;
    --color-image-ring: rgba(103, 232, 249, 0.28);
}

/* Auto-dark when user hasn't explicitly set light theme */
@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) {
        --color-text: #e5e7eb;
        --color-text-light: #cbd5e1;
        --color-text-muted: #94a3b8;
        --color-bg: #0b1220;
        --color-bg-light: #0f1b2d;
        --color-bg-dark: #070f1a;
        --color-border: rgba(255, 255, 255, 0.12);

        --color-navbar-bg: rgba(11, 18, 32, 0.78);
        --color-hero-bg-start: #06141f;
        --color-hero-bg-end: #0b1b2b;
        --color-image-ring: rgba(103, 232, 249, 0.28);
    }
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    /* Base font size for rem calculations */
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip to main content link for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   Typography
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: var(--font-size-5xl);
    font-weight: 800;
}

h2 {
    font-size: var(--font-size-4xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

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

a:hover {
    color: var(--color-primary-dark);
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background-color: var(--color-navbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
}

.logo {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 700;
    font-style: italic;
    letter-spacing: -0.01em;
    color: var(--color-text);
    transition: color var(--transition-fast), opacity var(--transition-fast);
}

.logo:hover {
    color: var(--color-primary);
    opacity: 0.85;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
    margin-left: auto;
}

.theme-toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 44px;
    /* Accessibility: minimum touch target size */
    z-index: var(--z-fixed);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}


.theme-toggle input {
    position: absolute;
    opacity: 0;
    width: 1px;
    height: 1px;
    pointer-events: none;
}

.theme-toggle .slider {
    position: absolute;
    inset: 5px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background-color: rgba(var(--color-primary-rgb), 0.08);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.theme-toggle .slider::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 50%;
    width: 18px;
    height: 18px;
    transform: translateY(-50%);
    border-radius: 50%;
    background-color: var(--color-bg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), background-color var(--transition-fast);
}

.theme-toggle .slider::after {
    content: "☾\FE0E";
    position: absolute;
    right: 8px;
    top: 4px;
    font-size: 14px;
    color: var(--color-text-muted);
}

.theme-toggle input:checked+.slider {
    background-color: rgba(var(--color-primary-rgb), 0.18);
    border-color: rgba(var(--color-primary-rgb), 0.45);
    box-shadow: var(--shadow-md);
}

.theme-toggle input:checked+.slider::before {
    transform: translate(28px, -50%);
}

.theme-toggle input:checked+.slider::after {
    content: "☀\FE0E";
    left: 8px;
    right: auto;
}

.theme-toggle:hover .slider {
    border-color: rgba(var(--color-primary-rgb), 0.6);
}

.theme-toggle:active .slider::before {
    background-color: var(--color-bg-light);
}

.theme-toggle input:focus-visible+.slider {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.nav-link {
    font-weight: 500;
    color: var(--color-text);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--spacing-sm);
    right: var(--spacing-sm);
    height: 2px;
    background-color: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}

/* Mobile menu toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: var(--z-fixed);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    min-height: 44px;
    /* Accessibility: minimum touch target size */
    min-width: 44px;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-brand);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(115deg, transparent 20%, rgba(255, 255, 255, 0.35) 50%, transparent 80%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

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

.btn-primary:hover::before {
    transform: translateX(100%);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--gradient-brand);
    border-color: transparent;
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-full {
    width: 100%;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: var(--spacing-3xl) 0;
    background:
        radial-gradient(circle at 1px 1px, rgba(var(--color-primary-rgb), 0.14) 1px, transparent 0) 0 0 / 28px 28px,
        linear-gradient(135deg, var(--color-hero-bg-start) 0%, var(--color-hero-bg-end) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before,
.hero::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}

.hero::before {
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(var(--color-primary-rgb), 0.16) 0%, transparent 70%);
    animation: driftSlow 14s ease-in-out infinite;
}

.hero::after {
    bottom: -35%;
    left: -15%;
    width: 480px;
    height: 480px;
    background: radial-gradient(circle, rgba(var(--color-secondary-rgb), 0.14) 0%, transparent 70%);
    animation: driftSlow 14s ease-in-out infinite reverse;
}

@keyframes driftSlow {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(-24px, 24px) scale(1.06);
    }
}

.hero .container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content {
    animation: fadeInUp 0.45s ease-out;
}

.hero-greeting {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    font-family: var(--font-primary);
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-primary);
    background-color: rgba(var(--color-primary-rgb), 0.1);
    border: 1px solid rgba(var(--color-primary-rgb), 0.22);
    padding: 0.4em 0.9em;
    border-radius: 999px;
    margin-bottom: var(--spacing-md);
}

.hero-greeting::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gradient-brand);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.4s ease-out both;
}

.hero-image-wrapper {
    position: relative;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    border-radius: 50%;
    padding: 6px;
    overflow: hidden;
    background: var(--gradient-brand);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    animation: float 6s ease-in-out infinite;
}

.hero-image {
    width: 100%;
    height: 110%;
    object-fit: cover;
    object-position: center 35%;
    /* Position image lower to show face better */
    border-radius: 50%;
    display: block;
}

/* ============================================
   Section Styles
   ============================================ */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.6em;
    font-family: var(--font-primary);
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.section-eyebrow::before {
    content: '';
    display: inline-block;
    width: 28px;
    height: 2px;
    border-radius: 2px;
    background: var(--gradient-brand);
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   About Section
   ============================================ */
.about {
    background-color: var(--color-bg-light);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.about-image-wrapper {
    position: relative;
    width: 100%;
    max-width: 250px;
    aspect-ratio: 1;
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 4px solid var(--color-image-ring);
    cursor: pointer;
    /* optional */
}

.about-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 10%;
    border-radius: calc(var(--border-radius-xl) - 4px);
    display: block;
    position: absolute;
    /* stack images */
    top: 0;
    left: 0;
    transition: opacity 0.3s ease-in-out;
}

.about-image-wrapper img.hover-image {
    opacity: 0;
    /* hide hover image initially */
}

.about-image-wrapper:hover img.hover-image {
    opacity: 1;
    /* show hover image */
}

.about-image-wrapper:hover img.about-image {
    opacity: 0;
    /* hide first image */
}

.about-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    font-weight: 500;
}

.about-details {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    font-weight: 500;
}

/* ============================================
   Skills Section
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.skill-card {
    position: relative;
    background-color: var(--color-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: all var(--transition-base);
    cursor: pointer;
    text-align: center;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-brand);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.skill-card:hover,
.skill-card:focus {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: transparent;
}

.skill-card:hover::before,
.skill-card:focus::before {
    transform: scaleX(1);
}

.skill-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(var(--color-primary-rgb), 0.12), rgba(var(--color-secondary-rgb), 0.12));
    border-radius: var(--border-radius-md);
    transition: transform var(--transition-base);
}

.skill-card:hover .skill-icon {
    transform: scale(1.1) rotate(5deg);
}

.skill-icon svg {
    width: 32px;
    height: 32px;
}

.skill-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.skill-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ============================================
   Projects Section
   ============================================ */
.projects {
    background-color: var(--color-bg-light);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: 1px solid var(--color-border);
}

.project-card:hover,
.project-card:focus {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    border-color: transparent;
}

.project-image {
    position: relative;
    width: 100%;
    height: 240px;
    background: var(--gradient-brand);
    overflow: hidden;
}

.project-image > img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1), filter 0.45s ease;
    will-change: transform;
}

.project-card:hover .project-image > img,
.project-card:focus-visible .project-image > img {
    transform: scale(1.05);
    filter: brightness(1.03);
}

@media (prefers-reduced-motion: reduce) {
    .project-image > img {
        transition: none;
    }
}

.project-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    color: white;
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-primary);
    border-radius: var(--border-radius-md);
    transition: background-color var(--transition-fast);
}

.project-link:hover {
    background-color: var(--color-primary-dark);
}

.project-content {
    padding: var(--spacing-lg);
}

.project-category {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.project-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.project-url {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    word-break: break-word;
    opacity: 0.85;
}

.project-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    display: inline-block;
    padding: 4px var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    background-color: var(--color-bg-light);
    color: var(--color-text-light);
    border-radius: var(--border-radius-sm);
}

a.project-card {
    display: block;
    text-decoration: none;
    color: inherit;
    outline: none;
}

a.project-card:focus-visible {
    box-shadow: var(--shadow-xl), 0 0 0 3px rgba(var(--color-primary-rgb), 0.45);
}

.project-card--live-site .project-link {
    display: inline-block;
    cursor: pointer;
    border: none;
    font: inherit;
}

.project-live-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: var(--spacing-md);
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    border: 1px solid rgba(var(--color-primary-rgb), 0.35);
    border-radius: var(--border-radius-md);
    background-color: rgba(var(--color-primary-rgb), 0.06);
    transition: background-color var(--transition-base),
        border-color var(--transition-base), color var(--transition-fast),
        transform var(--transition-base);
}

.project-card--live-site:hover .project-live-cta,
.project-card--live-site:focus-visible .project-live-cta {
    background-color: rgba(var(--color-primary-rgb), 0.12);
    border-color: var(--color-primary);
    transform: translateX(2px);
}

.project-live-cta-icon {
    font-size: 1rem;
    line-height: 1;
    transition: transform var(--transition-base);
}

.project-card--live-site:hover .project-live-cta-icon,
.project-card--live-site:focus-visible .project-live-cta-icon {
    transform: translate(2px, -2px);
}

@media (prefers-reduced-motion: reduce) {
    .project-card--live-site:hover .project-live-cta,
    .project-card--live-site:focus-visible .project-live-cta,
    .project-card--live-site:hover .project-live-cta-icon,
    .project-card--live-site:focus-visible .project-live-cta-icon {
        transform: none;
    }
}

/* ============================================
   Contact Section
   ============================================ */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

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

.contact-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.contact-text {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    line-height: 1.7;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
    border-radius: var(--border-radius-md);
}

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

.contact-label {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.contact-value {
    display: block;
    font-size: var(--font-size-base);
    color: var(--color-text);
    font-weight: 500;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 44px;
    /* Accessibility: minimum touch target */
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.12);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-feedback {
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    text-align: center;
    margin-top: var(--spacing-xs);
}

.form-feedback.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.form-feedback.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--color-bg-dark);
    color: white;
    padding: var(--spacing-xl) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-text {
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
    min-width: 44px;
    /* Accessibility */
    min-height: 44px;
}

.social-link:hover {
    color: white;
    background: var(--gradient-brand);
    box-shadow: var(--shadow-glow);
    transform: translateY(-3px);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

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

.scroll-animate {
    opacity: 0;
    transform: translateY(12px);
    transition:
        opacity 0.3s ease var(--scroll-delay, 0s),
        transform 0.3s ease var(--scroll-delay, 0s);
}

.scroll-animate.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-20px) rotate(5deg);
    }
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet */
@media (max-width: 968px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --spacing-3xl: 4rem;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-visual {
        order: -1;
    }

    .hero-image-wrapper {
        max-width: 300px;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 200px 1fr;
        gap: var(--spacing-lg);
    }

    .about-image-wrapper {
        max-width: 200px;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .skills-grid,
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

/* Mobile */
@media (max-width: 640px) {
    :root {
        --container-padding: 1rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --spacing-3xl: 3rem;
        --spacing-2xl: 2rem;
    }

    /* Mobile Navigation */
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--color-bg);
        flex-direction: column;
        padding: var(--spacing-2xl) var(--spacing-lg);
        box-shadow: var(--shadow-xl);
        transition: right var(--transition-base);
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        width: 100%;
        padding: var(--spacing-sm);
    }

    /* Hero adjustments */
    .hero {
        padding: var(--spacing-2xl) 0;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-xl);
    }

    .hero-description {
        font-size: var(--font-size-base);
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .hero-image-wrapper {
        max-width: 250px;
    }

    .about-content {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }

    .about-image-wrapper {
        max-width: 200px;
        margin-bottom: var(--spacing-md);
    }

    /* Section spacing */
    section {
        padding: var(--spacing-2xl) 0;
    }

    /* Skills and Projects grid */
    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    /* Footer */
    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    /* Stats */
    .about-stats {
        gap: var(--spacing-md);
    }

    .stat-number {
        font-size: var(--font-size-3xl);
    }
}

/* Large screens */
@media (min-width: 1400px) {
    :root {
        --container-max-width: 1400px;
    }
}

/* Print styles */
@media print {

    .navbar,
    .footer,
    .hero-actions,
    .contact-form {
        display: none;
    }

    section {
        page-break-inside: avoid;
    }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ============================================
   Gallery — OJT carousel
   ============================================ */
.gallery {
    background-color: var(--color-bg);
}

.ojt-slideshow {
    max-width: 960px;
    margin: 0 auto;
}

.ojt-slideshow__meta {
    margin-bottom: var(--spacing-lg);
}

.ojt-slideshow__meta-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.ojt-slideshow__badge {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-primary);
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: linear-gradient(
        135deg,
        rgba(var(--color-primary-rgb), 0.15),
        rgba(var(--color-secondary-rgb), 0.1)
    );
    border: 1px solid rgba(var(--color-primary-rgb), 0.25);
}

.ojt-slideshow__count {
    margin: 0;
    font-family: ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-light);
    letter-spacing: 0.04em;
}

.ojt-slideshow__count-current {
    color: var(--color-text);
    font-size: var(--font-size-lg);
}

.ojt-slideshow__count-sep {
    margin: 0 0.15em;
    opacity: 0.45;
}

.ojt-slideshow__progress {
    height: 4px;
    border-radius: 999px;
    background-color: var(--color-border);
    overflow: hidden;
}

.ojt-slideshow__progress-fill {
    height: 100%;
    width: 0%;
    border-radius: inherit;
    background: linear-gradient(
        90deg,
        var(--color-primary),
        var(--color-secondary, var(--color-primary))
    );
    transition: width 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.ojt-slideshow__hint {
    margin: var(--spacing-sm) 0 0;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    opacity: 0.85;
}

.ojt-kbd {
    display: inline-block;
    padding: 0.1em 0.45em;
    font-size: 0.85em;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    background-color: var(--color-bg-light);
    color: var(--color-text);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.ojt-slideshow__frame {
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: stretch;
    gap: 0;
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--color-border);
    background: linear-gradient(
            160deg,
            rgba(var(--color-primary-rgb), 0.06),
            transparent 40%
        ),
        var(--color-bg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.ojt-slideshow__viewport {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    outline: none;
}

.ojt-slideshow__viewport::-webkit-scrollbar {
    display: none;
}

.ojt-slideshow__viewport:focus-visible {
    box-shadow: inset 0 0 0 2px rgba(var(--color-primary-rgb), 0.45);
}

.ojt-slide {
    flex: 0 0 100%;
    width: 100%;
    max-width: 100%;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    box-sizing: border-box;
}

.ojt-entry {
    display: grid;
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: 0;
    align-items: stretch;
    min-height: min(78vh, 520px);
    background-color: var(--color-bg);
    border-right: 1px solid var(--color-border);
    transition: box-shadow var(--transition-base);
}

.ojt-slide:last-child .ojt-entry {
    border-right: none;
}

.ojt-media {
    position: relative;
    width: 100%;
    min-height: 220px;
    background: linear-gradient(
        145deg,
        rgba(var(--color-primary-rgb), 0.14),
        rgba(var(--color-secondary-rgb), 0.1)
    );
}

.ojt-media::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(
        to top,
        rgba(0, 0, 0, 0.18),
        transparent 42%
    );
    opacity: 0.7;
}

.ojt-media img {
    position: relative;
    z-index: 0;
    width: 100%;
    height: 100%;
    min-height: 260px;
    max-height: min(52vh, 420px);
    object-fit: cover;
    display: block;
}

.ojt-body {
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--spacing-sm);
    border-left: 1px solid var(--color-border);
    background: linear-gradient(
        180deg,
        rgba(var(--color-primary-rgb), 0.03),
        transparent 55%
    );
}

.ojt-week {
    margin: 0;
    font-size: clamp(var(--font-size-xl), 2.5vw, var(--font-size-2xl));
    font-family: "Playfair Display", Georgia, serif;
    color: var(--color-text);
    line-height: 1.2;
}

.ojt-desc {
    margin: 0;
    color: var(--color-text-light);
    line-height: 1.75;
    font-size: var(--font-size-sm);
    max-height: 16rem;
    overflow-y: auto;
    padding-right: var(--spacing-xs);
}

.ojt-ask-ai {
    align-self: flex-start;
    margin-top: var(--spacing-sm);
    padding: 0.45rem 0.9rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    font-family: inherit;
    color: var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.08);
    border: 1px solid rgba(var(--color-primary-rgb), 0.35);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: background-color var(--transition-base),
        transform var(--transition-fast), border-color var(--transition-base);
}

.ojt-ask-ai:hover {
    background: rgba(var(--color-primary-rgb), 0.14);
    border-color: var(--color-primary);
}

.ojt-ask-ai:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.ojt-ask-ai:active {
    transform: scale(0.98);
}

.ojt-slideshow__arrow {
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    min-width: 2.75rem;
    padding: 0;
    border: none;
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.62);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    transition: background-color var(--transition-base), color var(--transition-base),
        transform var(--transition-fast);
}

.ojt-slideshow__arrow:hover {
    background: rgba(var(--color-primary-rgb), 0.18);
    color: var(--color-primary);
}

.ojt-slideshow__arrow:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
}

.ojt-slideshow__arrow:active {
    transform: scale(0.96);
}

.ojt-thumbs-wrap {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm) 0 var(--spacing-xs);
    mask-image: linear-gradient(
        90deg,
        transparent,
        #000 3%,
        #000 97%,
        transparent
    );
    -webkit-mask-image: linear-gradient(
        90deg,
        transparent,
        #000 3%,
        #000 97%,
        transparent
    );
}

.ojt-thumbs {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    gap: var(--spacing-sm);
    overflow-x: auto;
    overflow-y: hidden;
    padding: var(--spacing-xs) var(--spacing-sm) var(--spacing-md);
    scroll-behavior: smooth;
    scrollbar-width: thin;
}

.ojt-thumbs::-webkit-scrollbar {
    height: 6px;
}

.ojt-thumbs::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 999px;
}

.ojt-thumb {
    position: relative;
    flex: 0 0 auto;
    width: 4.25rem;
    height: 4.25rem;
    padding: 0;
    border: 2px solid transparent;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    background-color: var(--color-bg-light);
    background-size: cover;
    background-position: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.ojt-thumb:hover {
    transform: translateY(-3px) scale(1.04);
    border-color: rgba(var(--color-primary-rgb), 0.45);
}

.ojt-thumb.is-active {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(var(--color-primary-rgb), 0.25),
        var(--shadow-md);
    transform: translateY(-2px);
}

.ojt-thumb:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

@media (max-width: 768px) {
    .ojt-slideshow__frame {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }

    .ojt-slideshow__arrow {
        display: none;
    }

    .ojt-entry {
        grid-template-columns: 1fr;
        min-height: 0;
    }

    .ojt-body {
        border-left: none;
        border-top: 1px solid var(--color-border);
        padding: var(--spacing-lg);
    }

    .ojt-media img {
        max-height: 280px;
        min-height: 200px;
    }

    .ojt-desc {
        max-height: 12rem;
    }
}

html[data-theme="dark"] .ojt-slideshow__arrow {
    background: rgba(15, 27, 45, 0.82);
    color: var(--color-text);
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .ojt-slideshow__arrow {
        background: rgba(15, 27, 45, 0.82);
        color: var(--color-text);
    }
}

@media (prefers-reduced-motion: reduce) {
    .ojt-slideshow__viewport {
        scroll-behavior: auto;
    }

    .ojt-slideshow__progress-fill {
        transition: none;
    }

    .ojt-thumb,
    .ojt-slideshow__arrow {
        transition: none;
    }

    .ojt-thumb:hover,
    .ojt-thumb.is-active {
        transform: none;
    }
}