/* ================================================================
   BURAK ERDOGAN — PORTFOLIO DESIGN SYSTEM
   Aesthetic: Dark OLED Luxury × Cyberpunk
   Principles sourced from: Claude-Code-Frontend-Design-Toolkit
   — Real direction chosen before writing a single rule
   ================================================================ */

/* ── 1. DESIGN TOKENS ─────────────────────────────────────────── */
:root {
    /* Backgrounds — near-black with spectral blue undertone */
    --bg-primary:   oklch(0.08 0.015 240);
    --bg-secondary: oklch(0.115 0.015 240);
    --bg-tertiary:  oklch(0.145 0.015 240);

    /* Text */
    --text-primary:   oklch(0.94 0.010 220);
    --text-secondary: oklch(0.62 0.018 220);
    --text-muted:     oklch(0.44 0.013 220);
    --text-tertiary:  oklch(0.36 0.010 220);

    /* Accent palette */
    --accent-primary: oklch(0.74 0.19 200);   /* electric cyan */
    --accent-hover:   oklch(0.68 0.21 200);
    --accent-light:   oklch(0.81 0.15 200);
    --accent-purple:  oklch(0.63 0.22 280);   /* violet secondary */

    /* Semantic */
    --success:      oklch(0.73 0.18 145);
    --warning:      oklch(0.78 0.17  75);
    --error:        oklch(0.63 0.22  25);
    --matrix-color: #00ff41;

    /* Borders */
    --border-color: oklch(0.94 0.01 220 / 0.07);
    --border-hover: oklch(0.74 0.19 200 / 0.42);

    /* Glow shadows */
    --glow-xs: 0 0 10px oklch(0.74 0.19 200 / 0.18);
    --glow-sm: 0 0 20px oklch(0.74 0.19 200 / 0.20);
    --glow-md: 0 0 35px oklch(0.74 0.19 200 / 0.22);
    --glow-lg: 0 0 55px oklch(0.74 0.19 200 / 0.18);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    /* Layout */
    --nav-height:    64px;
    --section-pad-y: 7rem;
    --container-max: 1200px;

    /* Border radii */
    --r-xs: 4px;
    --r-sm: 6px;
    --r:    10px;
    --r-lg: 16px;
    --r-xl: 24px;
}

/* ── 2. LIGHT THEME ───────────────────────────────────────────── */
[data-theme="light"] {
    --bg-primary:   oklch(0.985 0.005 220);
    --bg-secondary: oklch(0.965 0.007 220);
    --bg-tertiary:  oklch(0.940 0.008 220);
    --text-primary:   oklch(0.14 0.020 220);
    --text-secondary: oklch(0.38 0.020 220);
    --text-muted:     oklch(0.55 0.015 220);
    --text-tertiary:  oklch(0.62 0.012 220);
    --border-color: oklch(0.14 0.02 220 / 0.10);
    --border-hover: oklch(0.74 0.19 200 / 0.55);
    --glow-xs: 0 0 10px oklch(0.74 0.19 200 / 0.14);
    --glow-sm: 0 0 20px oklch(0.74 0.19 200 / 0.16);
    --glow-md: 0 0 35px oklch(0.74 0.19 200 / 0.18);
    --glow-lg: 0 0 55px oklch(0.74 0.19 200 / 0.14);
}

/* ── 3. RESET ─────────────────────────────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background 0.3s ease, color 0.3s ease;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* Disabled legacy canvases */
#particles-canvas,
#matrix-canvas,
.analytics-widget { display: none; }

/* ── 4. ACCESSIBILITY ─────────────────────────────────────────── */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    padding: 0.75rem 1.5rem;
    background: var(--accent-primary);
    color: var(--bg-primary);
    border-radius: var(--r);
    font-weight: 700;
    z-index: 9999;
    transition: top 0.2s;
}
.skip-link:focus { top: 1rem; }

/* ── 5. LAYOUT ────────────────────────────────────────────────── */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: var(--section-pad-y) 0;
}

section:nth-child(even) {
    background: var(--bg-secondary);
}

main {
    padding-top: var(--nav-height);
}

/* ── 6. NAVIGATION ────────────────────────────────────────────── */
nav {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: var(--nav-height);
    background: oklch(0.08 0.015 240 / 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background 0.3s, box-shadow 0.3s;
}

[data-theme="light"] nav {
    background: oklch(0.985 0.005 220 / 0.90);
}

nav.scrolled {
    background: oklch(0.08 0.015 240 / 0.97);
    box-shadow: 0 1px 0 var(--border-color), 0 8px 30px oklch(0 0 0 / 0.4);
}

[data-theme="light"] nav.scrolled {
    background: oklch(0.985 0.005 220 / 0.99);
    box-shadow: 0 1px 0 var(--border-color), 0 4px 20px oklch(0 0 0 / 0.08);
}

.nav-progress {
    position: absolute;
    bottom: 0; left: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-purple));
    width: 0%;
    transition: width 0.1s ease-out;
}

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

/* Brand */
.nav-brand-link {
    display: flex;
    align-items: center;
    height: 100%;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: opacity 0.2s;
}

.nav-brand:hover { opacity: 0.8; }

.nav-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px; height: 34px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    border-radius: var(--r-sm);
    font-size: 0.9rem;
    color: oklch(0.06 0.01 240);
    flex-shrink: 0;
}

.nav-name {
    font-size: 0.975rem;
    font-weight: 700;
    letter-spacing: -0.4px;
    color: var(--text-primary);
}

.nav-title {
    font-family: var(--font-mono);
    font-size: 0.575rem;
    font-weight: 500;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    padding: 0.2rem 0.5rem;
    background: oklch(0.74 0.19 200 / 0.10);
    border: 1px solid oklch(0.74 0.19 200 / 0.22);
    border-radius: var(--r-xs);
}

/* Links */
nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.2rem;
    height: 100%;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.45rem 0.65rem;
    border-radius: var(--r-sm);
    transition: color 0.2s, background 0.2s;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--text-primary);
    background: oklch(0.94 0.01 220 / 0.06);
}

.nav-link.active {
    color: var(--accent-primary);
    background: oklch(0.74 0.19 200 / 0.10);
}

.nav-icon {
    font-size: 0.78rem;
    opacity: 0.65;
    transition: opacity 0.2s, color 0.2s;
}

.nav-link:hover .nav-icon,
.nav-link.active .nav-icon {
    opacity: 1;
    color: var(--accent-primary);
}

/* Hamburger */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: oklch(0.74 0.19 200 / 0.08);
    border: 1px solid oklch(0.74 0.19 200 / 0.20);
    border-radius: var(--r-sm);
    width: 42px; height: 42px;
    cursor: pointer;
    transition: background 0.2s;
}

.mobile-menu-btn:hover { background: oklch(0.74 0.19 200 / 0.15); }

.hamburger-line {
    display: block;
    width: 20px; height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s;
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-btn.active .hamburger-line:nth-child(2) { opacity: 0; transform: scaleX(0); }
.mobile-menu-btn.active .hamburger-line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── 7. LANGUAGE SWITCHER & THEME TOGGLE ──────────────────────── */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.lang-switch {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-sm);
    padding: 0.2rem;
    display: flex;
    gap: 0.2rem;
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.32rem 0.56rem;
    cursor: pointer;
    border-radius: var(--r-xs);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
    transition: all 0.2s;
    min-width: 32px;
}

.lang-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.lang-btn.active { background: var(--accent-primary); color: oklch(0.06 0.01 240); }

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 36px; height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--glow-sm);
}

.theme-icon {
    color: var(--accent-primary);
    font-size: 0.9rem;
    transition: transform 0.3s;
}

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

/* ── 8. HERO SECTION ──────────────────────────────────────────── */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 5rem 0 4rem;
}

/* Cyberpunk grid overlay */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(oklch(0.94 0.01 220 / 0.035) 1px, transparent 1px),
        linear-gradient(90deg, oklch(0.94 0.01 220 / 0.035) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 80%);
    pointer-events: none;
    z-index: 0;
}

/* Ambient dual glow */
.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 90% 55% at 50% -5%, oklch(0.74 0.19 200 / 0.10) 0%, transparent 60%),
        radial-gradient(ellipse 45% 45% at 88% 55%, oklch(0.63 0.22 280 / 0.07) 0%, transparent 55%);
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 820px;
}

.hero-3d-container { display: none; }

/* Status pill */
.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: oklch(0.73 0.18 145 / 0.10);
    border: 1px solid oklch(0.73 0.18 145 / 0.28);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--success);
    margin-bottom: 1.875rem;
    letter-spacing: 0.5px;
}

.status-dot {
    width: 7px; height: 7px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
    flex-shrink: 0;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Gradient headline */
.hero h1 {
    font-size: clamp(2.75rem, 6vw, 4.75rem);
    font-weight: 800;
    letter-spacing: -2.5px;
    line-height: 1.05;
    margin-bottom: 1rem;
    background: linear-gradient(
        140deg,
        var(--text-primary) 30%,
        var(--accent-primary) 75%,
        var(--accent-purple) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero h2 {
    font-size: clamp(1.2rem, 2.4vw, 1.625rem);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.2px;
}

.hero p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 610px;
    line-height: 1.85;
    margin-bottom: 2.25rem;
}

/* Achievement stats row */
.hero-stats {
    display: flex;
    gap: 2.5rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--text-primary) 20%, var(--accent-primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 0.675rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.2px;
}

.hero-actions {
    display: flex;
    gap: 0.875rem;
    flex-wrap: wrap;
    align-items: center;
}

/* ── 9. BUTTONS ───────────────────────────────────────────────── */
.btn {
    padding: 0.8rem 1.6rem;
    border-radius: var(--r);
    font-size: 0.888rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-purple) 100%);
    color: oklch(0.97 0.005 220);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-md), 0 8px 28px oklch(0 0 0 / 0.30);
    color: oklch(0.97 0.005 220);
    filter: brightness(1.05);
}

.btn-secondary {
    background: oklch(0.94 0.01 220 / 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: oklch(0.94 0.01 220 / 0.10);
    border-color: oklch(0.94 0.01 220 / 0.18);
    transform: translateY(-2px);
}

/* ── 10. SECTION HEADERS ──────────────────────────────────────── */
.section-header { margin-bottom: 4rem; }

.section-label {
    font-family: var(--font-mono);
    font-size: 0.675rem;
    font-weight: 500;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-label::before {
    content: '';
    display: inline-block;
    width: 22px;
    height: 1px;
    background: var(--accent-primary);
    flex-shrink: 0;
    opacity: 0.7;
}

h2 {
    font-size: clamp(1.875rem, 4vw, 2.625rem);
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -1px;
    line-height: 1.1;
    margin-bottom: 1rem;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2.125rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.section-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 580px;
    line-height: 1.8;
}

/* ── 11. ABOUT SECTION ────────────────────────────────────────── */
.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.85;
    font-size: 0.975rem;
}

.journey-box {
    background: oklch(0.74 0.19 200 / 0.06);
    border-left: 2px solid var(--accent-primary);
    border-radius: 0 var(--r) var(--r) 0;
    padding: 1.625rem 1.875rem;
    margin: 1.875rem 0;
}

.journey-box strong { color: var(--text-primary); }

.highlight-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-top: 2rem;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r);
    transition: border-color 0.25s, box-shadow 0.25s;
    font-size: 0;
}

[data-theme="light"] .highlight-item { background: var(--bg-tertiary); }

.highlight-item:hover {
    border-color: var(--border-hover);
    box-shadow: var(--glow-xs);
}

.highlight-item i {
    color: var(--accent-primary);
    font-size: 1.05rem;
    flex-shrink: 0;
}

.highlight-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.education-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-lg);
    padding: 2rem;
    position: sticky;
    top: calc(var(--nav-height) + 2rem);
}

[data-theme="light"] .education-card { background: var(--bg-tertiary); }

.education-card h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.75rem;
}

.edu-item { margin-bottom: 1.5rem; }
.edu-item:last-child { margin-bottom: 0; }

.edu-school {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 0.3rem;
    font-size: 0.938rem;
}

.edu-details {
    color: var(--text-muted);
    font-size: 0.838rem;
    line-height: 1.65;
}

/* ── 12. PROJECTS SECTION ─────────────────────────────────────── */
.projects-grid {
    display: grid;
    gap: 1.5rem;
    counter-reset: project-counter;
}

.project-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--r-lg);
    border: 1px solid var(--border-color);
    transition: border-color 0.25s, box-shadow 0.25s;
    position: relative;
    overflow: hidden;
}

[data-theme="light"] .project-card { background: var(--bg-tertiary); }

/* Left glow accent bar */
.project-card::before {
    content: '';
    position: absolute;
    left: 0; top: 15%; bottom: 15%;
    width: 2px;
    background: linear-gradient(180deg, transparent, var(--accent-primary) 50%, transparent);
    opacity: 0;
    transition: opacity 0.3s;
    border-radius: 0 2px 2px 0;
}

.project-card:hover {
    border-color: oklch(0.74 0.19 200 / 0.35);
    box-shadow: 0 0 30px oklch(0.74 0.19 200 / 0.10), 0 8px 32px oklch(0 0 0 / 0.22);
}

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

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

.project-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    margin-bottom: 0.4rem;
}

.award-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    background: oklch(0.74 0.19 200 / 0.08);
    border: 1px solid oklch(0.74 0.19 200 / 0.28);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent-light);
    font-weight: 500;
    letter-spacing: 0.3px;
    flex-shrink: 0;
    white-space: nowrap;
}

.award-badge i { font-size: 0.68rem; }

.project-description {
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    padding: 0.28rem 0.7rem;
    background: oklch(0.94 0.01 220 / 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--r-xs);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-secondary);
    transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.tech-tag:hover {
    border-color: oklch(0.74 0.19 200 / 0.40);
    color: var(--accent-primary);
    background: oklch(0.74 0.19 200 / 0.08);
}

.project-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: oklch(0.94 0.01 220 / 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--r-sm);
    font-size: 0.813rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.project-link:hover {
    color: var(--accent-primary);
    border-color: oklch(0.74 0.19 200 / 0.40);
    background: oklch(0.74 0.19 200 / 0.08);
    transform: translateY(-1px);
}

/* ── 13. DEMOS SECTION ────────────────────────────────────────── */
.demo-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
    transition: border-color 0.25s;
}

[data-theme="light"] .demo-container { background: var(--bg-tertiary); }

.demo-container:hover { border-color: oklch(0.74 0.19 200 / 0.28); }

.demo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

.demo-title {
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.demo-status {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 0.32rem 0.85rem;
    border-radius: 100px;
    background: oklch(0.78 0.17 75 / 0.10);
    border: 1px solid oklch(0.78 0.17 75 / 0.32);
    color: var(--warning);
}

.demo-input {
    display: flex;
    gap: 0.875rem;
    margin-bottom: 1rem;
}

.demo-input input {
    flex: 1;
    padding: 0.8rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--r);
    color: var(--text-primary);
    font-size: 0.938rem;
    font-family: var(--font-sans);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.demo-input input::placeholder { color: var(--text-muted); }

.demo-input input:focus {
    outline: none;
    border-color: oklch(0.74 0.19 200 / 0.5);
    box-shadow: 0 0 0 3px oklch(0.74 0.19 200 / 0.12);
}

.demo-result {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--r);
    padding: 1rem;
    margin-top: 1rem;
    min-height: 54px;
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.938rem;
    transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.demo-result.positive {
    border-color: oklch(0.73 0.18 145 / 0.40);
    background: oklch(0.73 0.18 145 / 0.08);
    color: var(--success);
}

.demo-result.negative {
    border-color: oklch(0.63 0.22 25 / 0.40);
    background: oklch(0.63 0.22 25 / 0.08);
    color: var(--error);
}

.demo-result.neutral {
    border-color: oklch(0.78 0.17 75 / 0.40);
    background: oklch(0.78 0.17 75 / 0.08);
    color: var(--warning);
}

/* ── 14. TOOLS SECTION ────────────────────────────────────────── */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 1.25rem;
}

.tool-card-advanced {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-lg);
    padding: 1.5rem;
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
    position: relative;
    overflow: hidden;
}

[data-theme="light"] .tool-card-advanced { background: var(--bg-tertiary); }

/* Top edge glow on hover */
.tool-card-advanced::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.tool-card-advanced:hover {
    border-color: oklch(0.74 0.19 200 / 0.30);
    box-shadow: var(--glow-sm), 0 8px 24px oklch(0 0 0 / 0.18);
    transform: translateY(-3px);
}

.tool-card-advanced:hover::after { opacity: 1; }

.tool-icon {
    font-size: 1.875rem;
    color: var(--accent-primary);
    margin-bottom: 0.875rem;
    display: block;
}

.tool-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.tool-description {
    color: var(--text-secondary);
    font-size: 0.863rem;
    line-height: 1.65;
    margin-bottom: 1rem;
}

.tool-status {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.675rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 0.28rem 0.7rem;
    border-radius: 100px;
    background: oklch(0.78 0.17 75 / 0.10);
    border: 1px solid oklch(0.78 0.17 75 / 0.30);
    color: var(--warning);
}

.tool-status-live {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.675rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 0.28rem 0.7rem;
    border-radius: 100px;
    background: oklch(0.73 0.18 145 / 0.10);
    border: 1px solid oklch(0.73 0.18 145 / 0.30);
    color: var(--success);
}

.tool-status-live::before {
    content: '';
    width: 5px; height: 5px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}

.tool-card { position: relative; overflow: visible; }
.tool-card:hover { border-color: var(--accent-primary); }
.tool-card .btn { font-size: 0.863rem; padding: 0.72rem 1.4rem; }

.view-all-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 2rem;
    background: oklch(0.94 0.01 220 / 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--r-lg);
    font-weight: 600;
    font-size: 0.913rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.25s;
}

.view-all-btn:hover {
    border-color: oklch(0.74 0.19 200 / 0.35);
    background: oklch(0.74 0.19 200 / 0.08);
    color: var(--accent-primary);
    box-shadow: var(--glow-sm);
}

.view-all-btn .fa-chevron-down,
.view-all-btn .fa-chevron-up {
    transition: transform 0.3s;
}

.view-all-btn:hover .fa-chevron-down { transform: translateY(3px); }

.hidden-tool { display: none; }

/* ── 15. INTERESTS SECTION ────────────────────────────────────── */
.interests-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.interest-card {
    background: var(--bg-secondary);
    padding: 2rem 1.5rem;
    border-radius: var(--r-lg);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: border-color 0.25s, box-shadow 0.25s;
}

[data-theme="light"] .interest-card { background: var(--bg-tertiary); }

.interest-card:hover {
    border-color: oklch(0.74 0.19 200 / 0.30);
    box-shadow: var(--glow-xs);
}

.interest-icon {
    font-size: 2.125rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    display: block;
    transition: transform 0.3s;
}

.interest-card:hover .interest-icon { transform: scale(1.1) translateY(-2px); }

.interest-card h4 {
    color: var(--text-primary);
    font-size: 0.963rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.interest-card p {
    color: var(--text-muted);
    font-size: 0.863rem;
    line-height: 1.65;
}

/* ── 16. CONTACT SECTION ──────────────────────────────────────── */
#contact .section-header {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#contact .section-label {
    justify-content: center;
}

#contact .section-label::before { display: none; }

#contact .section-description { text-align: center; }

.contact-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    max-width: 440px;
    margin: 0 auto;
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r);
    color: var(--text-secondary);
    font-size: 0.913rem;
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s, transform 0.2s, box-shadow 0.2s;
}

[data-theme="light"] .contact-item { background: var(--bg-tertiary); }

.contact-item i {
    color: var(--accent-primary);
    font-size: 1.05rem;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.contact-item:hover {
    border-color: oklch(0.74 0.19 200 / 0.38);
    color: var(--text-primary);
    transform: translateX(4px);
    box-shadow: var(--glow-xs);
}

/* ── 17. CONTACT FORM ─────────────────────────────────────────── */
.contact-form {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-lg);
    padding: 2rem;
}

.form-group { margin-bottom: 1.5rem; }

.form-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.863rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--r);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.938rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: oklch(0.74 0.19 200 / 0.5);
    box-shadow: 0 0 0 3px oklch(0.74 0.19 200 / 0.12);
}

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

#formStatus {
    padding: 1rem;
    border-radius: var(--r);
    margin-top: 1rem;
    display: none;
}

#formStatus.success {
    background: oklch(0.73 0.18 145 / 0.10);
    border: 1px solid oklch(0.73 0.18 145 / 0.32);
    color: var(--success);
}

#formStatus.error {
    background: oklch(0.63 0.22 25 / 0.10);
    border: 1px solid oklch(0.63 0.22 25 / 0.32);
    color: var(--error);
}

/* ── 18. BLOG ─────────────────────────────────────────────────── */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.blog-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-lg);
    overflow: hidden;
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}

.blog-card:hover {
    border-color: oklch(0.74 0.19 200 / 0.30);
    box-shadow: var(--glow-sm), 0 12px 32px oklch(0 0 0 / 0.18);
    transform: translateY(-4px);
}

.blog-image {
    width: 100%;
    height: 175px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: oklch(0.97 0.005 220);
}

.blog-content { padding: 1.5rem; }

.blog-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.875rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.3px;
}

.blog-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.625rem;
    letter-spacing: -0.3px;
    line-height: 1.4;
}

.blog-excerpt {
    color: var(--text-secondary);
    font-size: 0.863rem;
    line-height: 1.65;
    margin-bottom: 1rem;
}

.blog-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.blog-tag {
    padding: 0.2rem 0.62rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-xs);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-secondary);
}

/* ── 19. FOOTER ───────────────────────────────────────────────── */
footer {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

footer p { font-size: 0.863rem; line-height: 1.65; }

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1rem;
}

.footer-link {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    transition: color 0.2s;
}

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

/* ── 20. CV DROPDOWN ──────────────────────────────────────────── */
.cv-dropdown { position: relative; display: inline-flex; }

.cv-dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    min-width: 180px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--r);
    overflow: hidden;
    box-shadow: 0 12px 40px oklch(0 0 0 / 0.40);
    z-index: 100;
    animation: menu-in 0.18s ease;
}

@keyframes menu-in {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.cv-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-decoration: none;
    transition: background 0.15s;
    border-bottom: 1px solid var(--border-color);
}

.cv-option:last-child { border-bottom: none; }
.cv-option:hover { background: var(--bg-secondary); }

/* ── 21. SKILLS ───────────────────────────────────────────────── */
.skills-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.skill-category {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--r-lg);
    border: 1px solid var(--border-color);
    transition: border-color 0.25s;
}

.skill-category:hover { border-color: oklch(0.74 0.19 200 / 0.20); }

.skill-category h4 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    font-size: 0.975rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.skill-category h4 i { color: var(--accent-primary); }

.skills-list { display: flex; flex-direction: column; gap: 1rem; }

.skill-item {
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--r);
    border: 1px solid var(--border-color);
    transition: border-color 0.2s;
}

.skill-item:hover { border-color: oklch(0.74 0.19 200 / 0.25); }

.skill-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-name { font-weight: 700; color: var(--text-primary); font-size: 0.938rem; }

.skill-experience {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-secondary);
    background: var(--bg-primary);
    padding: 0.18rem 0.62rem;
    border-radius: var(--r-xs);
    border: 1px solid var(--border-color);
}

.skill-badge {
    font-family: var(--font-mono);
    font-size: 0.663rem;
    font-weight: 600;
    padding: 0.18rem 0.62rem;
    border-radius: var(--r-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-badge {
    background: oklch(0.73 0.18 145 / 0.10);
    color: var(--success);
    border: 1px solid oklch(0.73 0.18 145 / 0.28);
}

.tubitak-badge {
    background: oklch(0.74 0.19 200 / 0.10);
    color: var(--accent-primary);
    border: 1px solid oklch(0.74 0.19 200 / 0.28);
}

.accuracy-badge {
    background: oklch(0.78 0.17 75 / 0.10);
    color: var(--warning);
    border: 1px solid oklch(0.78 0.17 75 / 0.28);
}

.skill-tags { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-top: 0.5rem; }

.skill-tags .skill-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.18rem 0.6rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-xs);
    color: var(--text-secondary);
    transition: border-color 0.2s, color 0.2s;
}

.skill-tags .skill-tag:hover {
    border-color: oklch(0.74 0.19 200 / 0.40);
    color: var(--accent-primary);
}

.skill-radar-container { display: none; }

/* ── 22. FAQ ──────────────────────────────────────────────────── */
#faq-section { display: none; }

.faq-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 860px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-lg);
    overflow: hidden;
    transition: border-color 0.2s;
}

.faq-item:hover { border-color: oklch(0.74 0.19 200 / 0.22); }

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.938rem;
    font-weight: 600;
    text-align: left;
    font-family: inherit;
    transition: color 0.2s;
}

.faq-question:hover { color: var(--accent-primary); }
.faq-question[aria-expanded="true"] { color: var(--accent-primary); }

.faq-icon {
    flex-shrink: 0;
    font-size: 0.8rem;
    color: var(--accent-primary);
    transition: transform 0.3s;
}

.faq-question[aria-expanded="true"] .faq-icon { transform: rotate(180deg); }

.faq-answer {
    display: none;
    padding: 0 1.5rem 1.25rem;
    color: var(--text-secondary);
    font-size: 0.938rem;
    line-height: 1.75;
    border-top: 1px solid var(--border-color);
}

.faq-answer.open { display: block; }
.faq-answer p { margin-top: 1rem; }

/* ── 23. MISC / EASTER EGG ────────────────────────────────────── */
.konami-popup {
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-secondary);
    border: 1px solid var(--border-hover);
    border-radius: var(--r-lg);
    padding: 2rem;
    z-index: 10000;
    text-align: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    max-width: 400px;
    box-shadow: var(--glow-md), 0 24px 60px oklch(0 0 0 / 0.50);
}

.konami-popup.show { opacity: 1; visibility: visible; }

.mini-game {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--r);
    padding: 1rem;
    margin: 1rem 0;
}

.game-button {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    color: oklch(0.06 0.01 240);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--r-sm);
    cursor: pointer;
    margin: 0.25rem;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.game-button:hover { filter: brightness(1.1); transform: scale(1.05); }

.loading {
    display: inline-block;
    width: 18px; height: 18px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Matrix mode */
.matrix-active { background: #000; color: #00ff41; }
.matrix-active * { text-shadow: 0 0 10px #00ff41; }

/* ── 24. 3D FLIP CARDS ────────────────────────────────────────── */
.flip-card {
    perspective: 1000px;
    height: 280px;
}

.flip-card-inner {
    position: relative;
    width: 100%; height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner { transform: rotateY(180deg); }

.flip-card-front, .flip-card-back {
    position: absolute;
    inset: 0;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: var(--r-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.flip-card-front { background: var(--bg-secondary); }
.flip-card-back {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    color: oklch(0.97 0.005 220);
    transform: rotateY(180deg);
    border: none;
}

/* ── 25. ANIMATIONS & FADE-IN ─────────────────────────────────── */
/* Default: visible. JS observer enhances with scroll animation. */
.fade-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

/* JS adds .will-animate before observing — hides until in viewport */
.fade-in.will-animate {
    opacity: 0;
    transform: translateY(16px);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOutDown {
    from { opacity: 1; transform: translateY(0); }
    to   { opacity: 0; transform: translateY(20px); }
}

/* Skeleton loader */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-secondary) 25%,
        var(--bg-tertiary)  50%,
        var(--bg-secondary) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ── 26. ANALYTICS STAT (preserved, hidden) ───────────────────── */

/* ── 27. EXPERIENCE TIMELINE ───────────────────────────────────── */
.exp-timeline {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    position: relative;
    padding-left: 2rem;
}

.exp-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.75rem;
    bottom: 0.75rem;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-primary), oklch(0.74 0.19 200 / 0.1));
    border-radius: 2px;
}

.exp-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--r-lg);
    padding: 1.25rem 1.5rem;
    position: relative;
    transition: border-color 0.25s, box-shadow 0.25s;
}

[data-theme="light"] .exp-card { background: var(--bg-tertiary); }

.exp-card::before {
    content: '';
    position: absolute;
    left: -2.45rem;
    top: 1.35rem;
    width: 10px;
    height: 10px;
    background: var(--accent-primary);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
    box-shadow: 0 0 8px oklch(0.74 0.19 200 / 0.5);
}

.exp-card:hover {
    border-color: oklch(0.74 0.19 200 / 0.35);
    box-shadow: 0 0 20px oklch(0.74 0.19 200 / 0.08);
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.4rem;
}

.exp-company {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.3px;
    margin-bottom: 0.15rem;
    font-family: var(--font-mono);
}

.exp-role {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.exp-date {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 0.2rem 0.55rem;
    border-radius: 100px;
    border: 1px solid var(--border-color);
    white-space: nowrap;
    flex-shrink: 0;
}

.exp-desc {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.65;
    margin-top: 0.4rem;
}

.exp-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.65rem;
}

@media (max-width: 640px) {
    .exp-timeline { padding-left: 1.5rem; }
    .exp-card::before { left: -1.95rem; }
}
.analytics-stat {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.25rem;
    font-size: 0.75rem;
}

.analytics-stat-label { color: var(--text-secondary); }
.analytics-stat-value { color: var(--accent-primary); font-weight: 600; }

/* ── 27. MOBILE NAV BREAKPOINTS ───────────────────────────────── */
@media (max-width: 1200px) {
    nav ul { gap: 0.15rem; }
    .nav-link { font-size: 0.75rem; padding: 0.4rem 0.55rem; }
}

@media (max-width: 992px) {
    .nav-title { display: none; }
    .nav-link { font-size: 0.7rem; padding: 0.35rem 0.45rem; }
}

@media (max-width: 768px) {
    .mobile-menu-btn { display: flex; }
    .nav-controls { gap: 0.35rem; }

    nav ul {
        position: fixed;
        top: var(--nav-height);
        left: 0; right: 0; bottom: 0;
        background: oklch(0.08 0.015 240 / 0.97);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        flex-direction: column;
        gap: 0.5rem;
        padding: 2rem 1.5rem;
        transform: translateX(100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        align-items: stretch;
    }

    [data-theme="light"] nav ul {
        background: oklch(0.985 0.005 220 / 0.97);
    }

    nav ul.mobile-open {
        transform: translateX(0);
        opacity: 1;
        visibility: visible;
    }

    nav ul li {
        transform: translateX(30px);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.3s ease;
    }

    nav ul.mobile-open li { transform: translateX(0); opacity: 1; }
    nav ul.mobile-open li:nth-child(1) { transition-delay: 0.05s; }
    nav ul.mobile-open li:nth-child(2) { transition-delay: 0.10s; }
    nav ul.mobile-open li:nth-child(3) { transition-delay: 0.15s; }
    nav ul.mobile-open li:nth-child(4) { transition-delay: 0.20s; }
    nav ul.mobile-open li:nth-child(5) { transition-delay: 0.25s; }
    nav ul.mobile-open li:nth-child(6) { transition-delay: 0.30s; }
    nav ul.mobile-open li:nth-child(7) { transition-delay: 0.35s; }

    .nav-link {
        display: flex;
        padding: 1rem 1.25rem;
        font-size: 1rem;
        background: oklch(0.74 0.19 200 / 0.04);
        border: 1px solid var(--border-color);
        border-radius: var(--r);
    }

    .nav-link:hover,
    .nav-link.active {
        background: oklch(0.74 0.19 200 / 0.10);
        border-color: oklch(0.74 0.19 200 / 0.30);
        color: var(--accent-primary);
        transform: none;
    }
}

/* ── 28. RESPONSIVE LAYOUT ────────────────────────────────────── */
@media (max-width: 1024px) {
    :root { --section-pad-y: 5rem; }

    .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
    .education-card { position: static; }
    .skills-container { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    h2 { font-size: 2rem; }
    .section-header { margin-bottom: 2.75rem; }
}

@media (max-width: 768px) {
    :root { --section-pad-y: 4rem; }

    .container { padding: 0 1.25rem; }

    .hero { padding-top: 5rem; padding-bottom: 3rem; }
    .hero h1 { font-size: 2.5rem; letter-spacing: -1.5px; }
    .hero h2 { font-size: 1.2rem; }
    .hero p  { font-size: 0.975rem; }
    .hero-stats { gap: 1.5rem; }

    .interests-grid { grid-template-columns: repeat(2, 1fr); }
    .highlight-grid { grid-template-columns: 1fr; }
    .tools-grid { grid-template-columns: 1fr; }
    .blog-grid  { grid-template-columns: 1fr; }

    .demo-input { flex-direction: column; }

    .lang-switch { top: 0.75rem; right: 0.75rem; }
    .theme-toggle { top: 3.75rem; right: 0.75rem; width: 40px; height: 40px; }

    .section-header { margin-bottom: 2.25rem; }
}

@media (max-width: 480px) {
    .hero { padding-top: 5.5rem; }
    .hero h1 { font-size: 2.1rem; letter-spacing: -1px; }
    .hero h2 { font-size: 1.05rem; }

    .hero-actions { flex-direction: column; align-items: stretch; }
    .btn { width: 100%; justify-content: center; }

    .interests-grid { grid-template-columns: 1fr; }

    .lang-switch { top: 0.5rem; right: 0.5rem; }
    .theme-toggle { top: 3.4rem; right: 0.5rem; width: 38px; height: 38px; }
}

/* ── 29. TOUCH DEVICE OVERRIDES ───────────────────────────────── */
@media (hover: none) and (pointer: coarse) {
    .project-card:hover,
    .tool-card-advanced:hover,
    .blog-card:hover,
    .interest-card:hover,
    .highlight-item:hover {
        transform: none;
        box-shadow: none;
    }

    .project-card:active,
    .tool-card-advanced:active {
        transform: scale(0.99);
        transition: transform 0.1s ease;
    }
}

/* ── 30. PRINT / REDUCED MOTION ───────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    html { scroll-behavior: auto; }
}

/* ── 31. TERMINAL × PREMIUM ENHANCEMENTS ─────────────────────── */

/* Blinking cursor on hero h2 */
.hero h2::after {
    content: '_';
    display: inline-block;
    color: var(--accent-primary);
    animation: cursor-blink 1.1s step-end infinite;
    font-weight: 400;
    margin-left: 2px;
    opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
    .hero h2::after { animation: none; opacity: 1; }
}

@keyframes cursor-blink {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
}

/* Scroll-down indicator */
.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    margin-top: 2.5rem;
}

.scroll-indicator-inner {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.scroll-line {
    display: block;
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, var(--accent-primary), transparent);
    animation: scroll-line-pulse 2s ease-in-out infinite;
}

@keyframes scroll-line-pulse {
    0%, 100% { opacity: 0.5; transform: scaleY(1); }
    50%       { opacity: 1;   transform: scaleY(1.15); }
}

.scroll-text {
    font-family: var(--font-mono);
    font-size: 0.63rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    writing-mode: horizontal-tb;
}

/* Project card large index numbers */
.project-card::after {
    counter-increment: project-counter;
    content: counter(project-counter, decimal-leading-zero);
    position: absolute;
    top: 0.75rem;
    right: 1.25rem;
    font-family: var(--font-mono);
    font-size: 5rem;
    font-weight: 800;
    color: var(--text-primary);
    opacity: 0.04;
    line-height: 1;
    pointer-events: none;
    letter-spacing: -3px;
    transition: opacity 0.3s;
    z-index: 0;
}

.project-card:hover::after { opacity: 0.07; }

/* Make project card content sit above the index number */
.project-card > * { position: relative; z-index: 1; }

/* Award badge variants */
.award-badge--gold {
    background: oklch(0.78 0.17 75 / 0.12) !important;
    border-color: oklch(0.78 0.17 75 / 0.40) !important;
    color: oklch(0.82 0.17 75) !important;
}

.award-badge--gold i { color: oklch(0.82 0.17 75) !important; }

.award-badge--green {
    background: oklch(0.73 0.18 145 / 0.12) !important;
    border-color: oklch(0.73 0.18 145 / 0.40) !important;
    color: oklch(0.77 0.18 145) !important;
}

.award-badge--green i { color: oklch(0.77 0.18 145) !important; }

/* Section header — stronger hierarchy */
.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -1.5px;
}

/* Section label with short horizontal line */
.section-label::before {
    content: '';
    display: inline-block;
    width: 18px;
    height: 1px;
    background: var(--accent-primary);
    vertical-align: middle;
    margin-right: 0.6rem;
    opacity: 0.7;
}

/* Tech tag — cyan on the accent ones */
.tech-tag--accent {
    border-color: oklch(0.74 0.19 200 / 0.35);
    color: var(--accent-primary);
    background: oklch(0.74 0.19 200 / 0.07);
}