/* ── Custom Fonts ───────────────────────────────────── */
@font-face {
    font-family: 'Urbanist';
    src: url('/static/fonts/Urbanist-Var.woff2') format('woff2-variations'),
         url('/static/fonts/Urbanist-Var.woff2') format('woff2');
    font-weight: 300 800;
    font-style: normal;
    font-display: swap;
}

/* ── Cascade Layers ─────────────────────────────────── */
@layer reset, base, layout, components, utilities;

/* ── RESET LAYER ────────────────────────────────────── */
@layer reset {
    *, *::before, *::after {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

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

    @media (prefers-reduced-motion: reduce) {
        html { scroll-behavior: auto; }
        *, *::before, *::after {
            animation-duration: 0.01ms !important;
            transition-duration: 0.01ms !important;
        }
    }

    body {
        min-height: 100vh;
        min-height: 100dvh;
        text-rendering: optimizeLegibility;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    img, picture, video, canvas, svg {
        display: block;
        max-width: 100%;
    }

    a {
        color: inherit;
        text-decoration: none;
    }

    ul, ol { list-style: none; }
    button { cursor: pointer; border: none; background: none; font: inherit; }
}

/* ── BASE LAYER ─────────────────────────────────────── */
@layer base {
    :root {
        /* Go Blue Accent & Tokens */
        --accent: #00ADD8;
        --accent-hover: #00C4F0;
        --accent-glow: rgba(0, 173, 216, 0.15);

        /* Spacing Scale */
        --space-xs: 0.5rem;
        --space-sm: 1rem;
        --space-md: 2rem;
        --space-lg: 4rem;
        --space-xl: 8rem;

        /* Typography */
        --font-sans: "Urbanist", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        --font-mono: "SF Mono", "JetBrains Mono", monospace;

        /* Transitions */
        --transition-fast: 150ms ease;
        --transition-base: 250ms ease;
        --transition-slow: 350ms ease;

        /* Layout Dimensions */
        --max-width: 1100px;
        --nav-height: 70px;

        /* ── Dark Theme Defaults (WCAG AAA Compliant) ── */
        --bg-primary: #0a0a0a;
        --bg-secondary: #111111;
        --bg-card: #161616;
        --border: #262626;
        --text-primary: #e5e5e5;
        --text-secondary: #a3a3a3;
        --text-muted: #525252;
        --nav-bg: rgba(10, 10, 10, 0.85);

        /* Go Logo Default (Gold/Yellow) */
        --go-logo-letters: #FDDD00;
        --go-logo-lines: #FDDD00;
    }

    /* ── Light Theme Overrides (WCAG AA Contrast Validated) ── */
    :root[data-theme="light"] {
        --bg-primary: #fafafa;
        --bg-secondary: #f5f5f5;
        --bg-card: #ffffff;
        --border: #e5e5e5;
        --text-primary: #171717;
        --text-secondary: #525252;
        --text-muted: #64748b; /* Contrast-optimized slate color */
        --nav-bg: rgba(250, 250, 250, 0.85);

        /* Go Logo light theme colors (Cyan and Deep Contrast Blue) */
        --go-logo-letters: #00ADD8;
        --go-logo-lines: #007D9C;
    }

    /* Respect system color-scheme when toggle is unset */
    @media (prefers-color-scheme: light) {
        html:not([data-theme="dark"]) {
            --bg-primary: #fafafa;
            --bg-secondary: #f5f5f5;
            --bg-card: #ffffff;
            --border: #e5e5e5;
            --text-primary: #171717;
            --text-secondary: #525252;
            --text-muted: #64748b;
            --nav-bg: rgba(250, 250, 250, 0.85);
            --go-logo-letters: #00ADD8;
            --go-logo-lines: #007D9C;
        }
    }

    body {
        font-family: var(--font-sans);
        font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
        line-height: 1.7;
        color: var(--text-primary);
        background-color: var(--bg-primary);
        transition: background-color var(--transition-slow),
                    color var(--transition-slow);
    }

    ::selection {
        background: var(--accent);
        color: #0a0a0a;
    }

    h1, h2, h3, h4 {
        line-height: 1.2;
        font-weight: 700;
        letter-spacing: -0.02em;
    }

    a {
        transition: color var(--transition-fast);
    }

    a:hover {
        color: var(--accent);
    }

    :focus-visible {
        outline: 2px solid var(--accent);
        outline-offset: 3px;
        border-radius: 2px;
    }
}

/* ── LAYOUT LAYER ───────────────────────────────────── */
@layer layout {
    .skip-link {
        position: absolute;
        top: -100%;
        left: var(--space-sm);
        padding: var(--space-xs) var(--space-sm);
        background: var(--accent);
        color: #0a0a0a;
        font-weight: 600;
        border-radius: 0 0 6px 6px;
        z-index: 1000;
        transition: top var(--transition-fast);
    }

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

    .section {
        padding: var(--space-xl) var(--space-md);
        position: relative;
        z-index: 2; /* Sits cleanly above background elements */
    }

    .section-inner {
        max-width: var(--max-width);
        margin: 0 auto;
    }

    .section-heading {
        font-family: var(--font-sans);
        font-size: clamp(1.25rem, 1rem + 1vw, 1.75rem);
        color: var(--text-primary);
        margin-bottom: var(--space-lg);
        display: flex;
        align-items: center;
        gap: var(--space-sm);
    }

    .section-heading::after {
        content: "";
        flex: 1;
        height: 1px;
        background: var(--border);
        margin-left: var(--space-sm);
    }

    .section-number {
        color: var(--accent);
        font-size: 0.85em;
    }
}

/* ── COMPONENTS LAYER ─────────────────────────────────── */
@layer components {

    /* ── Navigation Header ── */
    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
        height: var(--nav-height);
        background: var(--nav-bg);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
        transition: background var(--transition-slow);
    }

    .nav {
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 var(--space-md);
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .nav-logo {
        font-family: var(--font-sans);
        font-size: 1.25rem;
        font-weight: 700;
        color: var(--text-primary);
        letter-spacing: -0.03em;
    }

    .nav-links {
        display: flex;
        gap: var(--space-md);
    }

    .nav-links a {
        font-family: var(--font-sans);
        font-size: 0.85rem;
        color: var(--text-secondary);
        position: relative;
    }

    .nav-links a::after {
        content: "";
        position: absolute;
        bottom: -4px;
        left: 0;
        width: 0;
        height: 2px;
        background: var(--accent);
        transition: width var(--transition-base);
    }

    .nav-links a:hover {
        color: var(--accent);
    }

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

    .accent {
        color: var(--accent);
    }

    /* ── Theme Switch Controller ── */
    .theme-toggle {
        width: 40px;
        height: 40px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 8px;
        color: var(--text-secondary);
        font-size: 1.2rem;
        transition: color var(--transition-fast),
                    background var(--transition-fast);
    }

    .theme-toggle:hover {
        color: var(--accent);
        background: var(--accent-glow);
    }

    [data-theme="dark"] .theme-icon-dark { display: inline; }
    [data-theme="dark"] .theme-icon-light { display: none; }
    [data-theme="light"] .theme-icon-dark { display: none; }
    [data-theme="light"] .theme-icon-light { display: inline; }

    /* ── Nav Controls & Hamburgers ── */
    .nav-controls {
        display: flex;
        align-items: center;
        gap: var(--space-xs);
    }

    .menu-toggle {
        display: none;
        width: 40px;
        height: 40px;
        align-items: center;
        justify-content: center;
        border-radius: 8px;
        color: var(--text-primary);
        border: none;
        background: transparent;
        cursor: pointer;
        transition: background-color var(--transition-fast), color var(--transition-fast);
        -webkit-appearance: none;
        appearance: none;
        padding: 0;
    }

    .menu-toggle:hover {
        background: var(--accent-glow);
        color: var(--accent);
    }

    .hamburger-box {
        width: 20px;
        height: 12px;
        position: relative;
        display: inline-block;
    }

    .hamburger-inner {
        position: absolute;
        width: 14px;
        height: 2px;
        background-color: currentColor;
        border-radius: 2px;
        right: 0;
        top: 2px;
        transition: transform var(--transition-base), width var(--transition-base);
    }

    .hamburger-inner::after {
        content: "";
        position: absolute;
        width: 20px;
        height: 2px;
        background-color: currentColor;
        border-radius: 2px;
        right: 0;
        top: 8px;
        transition: transform var(--transition-base), top var(--transition-base), width var(--transition-base);
    }

    .menu-toggle[aria-expanded="true"] .hamburger-inner {
        width: 20px;
        transform: translateY(3px) rotate(45deg);
    }

    .menu-toggle[aria-expanded="true"] .hamburger-inner::after {
        width: 20px;
        top: 2px;
        transform: rotate(-90deg);
    }

    /* ── Hero Presentation ── */
    .hero {
        min-height: 100vh;
        min-height: 100dvh;
        display: flex;
        align-items: center;
        padding: var(--nav-height) var(--space-md) var(--space-lg);
        max-width: var(--max-width);
        margin: 0 auto;
        position: relative;
    }

    .hero-content {
        max-width: 700px;
        position: relative;
        z-index: 1;
    }

    .hero-greeting {
        font-family: var(--font-mono);
        font-size: clamp(0.85rem, 0.8rem + 0.25vw, 1rem);
        color: var(--accent);
        margin-bottom: var(--space-sm);
    }

    .hero-name {
        font-size: clamp(2.5rem, 1.5rem + 4vw, 4.5rem);
        color: var(--text-primary);
        margin-bottom: var(--space-xs);
    }

    .hero-tagline {
        font-size: clamp(1.5rem, 1rem + 2.5vw, 3rem);
        color: var(--text-secondary);
        font-weight: 600;
        margin-bottom: var(--space-md);
    }

    .cursor {
        color: var(--accent);
        animation: blink 1s step-end infinite;
    }

    @keyframes blink {
        50% { opacity: 0; }
    }

    .hero-description {
        color: var(--text-secondary);
        max-width: 540px;
        margin-bottom: var(--space-md);
        font-size: clamp(0.95rem, 0.9rem + 0.25vw, 1.1rem);
    }

    .hero-cta {
        display: flex;
        gap: var(--space-sm);
        flex-wrap: wrap;
    }

    .hero-visual {
        position: absolute;
        right: -10%;
        top: 50%;
        transform: translateY(-50%);
        width: 500px;
        height: 500px;
        pointer-events: none;
    }

    .gradient-orb {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background: radial-gradient(
            circle at 30% 40%,
            var(--accent-glow) 0%,
            transparent 70%
        );
        filter: blur(60px);
        opacity: 0.6;
    }

    /* ── Action Buttons ── */
    .btn {
        display: inline-flex;
        align-items: center;
        padding: 0.75rem 1.5rem;
        font-family: var(--font-sans);
        font-size: 0.9rem;
        border-radius: 6px;
        transition: all var(--transition-base);
        font-weight: 500;
    }

    .btn-primary {
        background: var(--accent);
        color: #0a0a0a;
    }

    .btn-primary:hover {
        background: var(--accent-hover);
        color: #0a0a0a;
        transform: translateY(-2px);
        box-shadow: 0 4px 20px var(--accent-glow);
    }

    .btn-ghost {
        border: 1px solid var(--accent);
        color: var(--accent);
    }

    .btn-ghost:hover {
        background: var(--accent-glow);
        color: var(--accent);
        transform: translateY(-2px);
    }

    /* ── About Profile ── */
    .about-text {
        max-width: 650px;
    }

    .about-text p {
        color: var(--text-secondary);
        margin-bottom: var(--space-sm);
    }

    .about-text p:last-child {
        margin-bottom: 0;
    }

    /* ── Interactive Skills Grid ── */
    .skills-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: var(--space-sm);
    }

    .skill-item {
        font-family: var(--font-sans);
        font-size: 0.9rem;
        font-weight: 600;
        padding: var(--space-sm);
        border: 1px solid var(--border);
        border-radius: 12px;
        display: flex;
        align-items: center;
        gap: 1rem;
        color: var(--text-primary);
        background: var(--bg-card);
        transition: all var(--transition-base);
    }

    .skill-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 24px;
        height: 24px;
        flex-shrink: 0;
        color: var(--text-secondary);
        transition: color var(--transition-base), transform var(--transition-base);
    }

    .skill-icon.logo-wide {
        width: 40px;
        height: auto;
    }

    .skill-icon svg {
        width: 100%;
        height: 100%;
        display: block;
    }

    .skill-item:hover {
        border-color: var(--accent);
        color: var(--accent);
        background: var(--accent-glow);
        transform: translateY(-2px);
        box-shadow: 0 4px 20px rgba(0, 173, 216, 0.1);
    }

    .skill-item:hover .skill-icon {
        color: var(--accent);
        transform: scale(1.1);
    }

    /* ── Project Cards ── */
    .projects-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: var(--space-md);
    }

    .project-card {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: var(--space-md);
        display: flex;
        flex-direction: column;
        gap: var(--space-sm);
        transition: all var(--transition-base);
    }

    .project-card:hover {
        border-color: var(--accent);
        transform: translateY(-4px);
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    }

    .project-header {
        display: flex;
        align-items: baseline;
        gap: var(--space-sm);
    }

    .project-number {
        font-family: var(--font-mono);
        font-size: 0.8rem;
        color: var(--accent);
    }

    .project-header h3 {
        font-size: 1.25rem;
        color: var(--text-primary);
    }

    .project-card p {
        color: var(--text-secondary);
        font-size: 0.95rem;
        flex: 1;
    }

    .project-tech {
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-xs);
    }

    .project-tech span {
        font-family: var(--font-mono);
        font-size: 0.75rem;
        color: var(--text-muted);
        background: var(--bg-secondary);
        padding: 0.25rem 0.6rem;
        border-radius: 4px;
    }

    .project-links a {
        font-family: var(--font-mono);
        font-size: 0.85rem;
        color: var(--accent);
    }

    .project-links a:hover {
        text-decoration: underline;
    }

    /* ── Premium Contact Elements ── */
    .section-contact {
        text-align: left;
    }

    .contact-text {
        color: var(--text-secondary);
        max-width: 520px;
        margin: 0 0 var(--space-lg);
        font-size: 1.05rem;
        line-height: 1.6;
    }

    .contact-links {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: var(--space-md);
        margin-top: var(--space-md);
    }

    .contact-card {
        position: relative;
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 12px 16px;
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: 12px;
        text-decoration: none;
        transition: transform var(--transition-base),
                    border-color var(--transition-base),
                    box-shadow var(--transition-base),
                    background-color var(--transition-base);
        text-align: left;
    }

    .contact-card:hover {
        transform: translateY(-3px);
        border-color: var(--accent);
        background: #111a28;
        box-shadow: 0 10px 25px -5px rgba(0, 173, 216, 0.2),
                    0 0 15px rgba(0, 173, 216, 0.1);
    }

    .contact-icon {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        border-radius: 10px;
        background: var(--accent-glow);
        color: var(--accent);
        flex-shrink: 0;
        transition: background-color var(--transition-base),
                    color var(--transition-base),
                    transform var(--transition-base);
    }

    .contact-icon svg {
        width: 22px;
        height: 22px;
        display: block;
        fill: none;
        stroke: currentColor;
        stroke-width: 1.75;
    }

    .contact-card:hover .contact-icon {
        background: var(--accent);
        color: var(--bg-primary);
        transform: scale(1.05);
    }

    .contact-info {
        display: flex;
        flex-direction: column;
        gap: 2px;
        flex: 1;
        min-width: 0;
    }

    .contact-label {
        font-weight: 600;
        font-size: 0.95rem;
        color: var(--text-primary);
    }

    .contact-handle {
        font-family: var(--font-mono);
        font-size: 0.8rem;
        color: var(--text-muted);
    }

    .contact-arrow {
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-muted);
        opacity: 0.4;
        transform: translateX(-4px);
        transition: transform var(--transition-base),
                    opacity var(--transition-base),
                    color var(--transition-base);
        flex-shrink: 0;
    }

    .contact-arrow svg {
        width: 16px;
        height: 16px;
        stroke: currentColor;
    }

    .contact-card:hover .contact-arrow {
        opacity: 1;
        transform: translateX(0);
        color: var(--accent);
    }

    /* ── Error Page (404) ───────────────────────────── */
    .error-page {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        min-height: 70vh;
        gap: var(--space-sm);
        text-align: center;
        padding: var(--space-md);
    }

    .error-code {
        font-family: var(--font-mono);
        font-size: clamp(4rem, 3rem + 5vw, 8rem);
        color: var(--accent);
        font-weight: 800;
        line-height: 1;
    }

    .error-message {
        color: var(--text-secondary);
        font-size: 1.1rem;
        margin-bottom: var(--space-sm);
    }

    /* ── High-Fidelity Site Footer ── */
    .site-footer {
        position: relative;
        margin-top: var(--space-xl);
        padding: var(--space-md) var(--space-sm);
        background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
        border-top: 1px solid var(--border);
        overflow: hidden;
    }

    /* Metal top border sheen */
    .site-footer::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 1px;
        background: linear-gradient(90deg,
            transparent 0%,
            var(--accent) 30%,
            var(--text-primary) 50%,
            var(--accent) 70%,
            transparent 100%);
        opacity: 0.6;
    }

    /* Mobile Default Layout: Stacked Centered Columns */
    .footer-inner {
        max-width: var(--max-width);
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 0.75rem;
        font-family: var(--font-sans);
        font-size: 0.75rem;
        color: var(--text-secondary);
        line-height: 1.5;
        text-align: center;
    }

    .footer-group {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.35rem;
    }

    .footer-separator {
        display: none; /* Block separators are omitted on mobile stacks */
    }

    .footer-note-container {
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
        white-space: nowrap;
        opacity: 0.85;
    }

    .footer-note-text {
        font-family: var(--font-sans);
        font-size: 0.65rem;
        font-weight: 700;
        letter-spacing: 0.12em;
        text-transform: uppercase;
        background: linear-gradient(180deg, var(--text-primary) 0%, var(--text-secondary) 100%);
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
        text-fill-color: transparent;
        filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.15));
    }

    .footer-go-svg {
        display: inline-flex;
        width: 30px;
        height: auto;
        margin-top: -1.5px;
    }

    .footer-go-svg svg {
        width: 100%;
        height: auto;
        display: block;
    }

    /* ── High-Fidelity SVG Brand Transitions ── */
    .go-brand-svg .go-speed-lines path {
        fill: var(--go-logo-lines);
        transition: fill var(--transition-slow); /* Smooth 350ms transition on theme flip */
    }

    .go-brand-svg .go-letters path {
        fill: var(--go-logo-letters);
        transition: fill var(--transition-slow);
    }

    .footer-link {
        display: inline-flex;
        align-items: center;
        gap: 3px;
        color: var(--accent);
        text-decoration: none;
        font-weight: 500;
    }

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

    .footer-icon {
        display: inline-flex;
        align-items: center;
        width: 10px;
        height: 10px;
    }

    .footer-icon svg {
        width: 100%;
        height: 100%;
        stroke: currentColor;
    }
} /* ── END COMPONENTS LAYER ─────────────────────────── */

/* ── UTILITIES LAYER (RESPONSIVE OVERRIDES) ────────── */
@layer utilities {
    @media (max-width: 768px) {
        .menu-toggle {
            display: flex;
        }

        .nav-links {
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            background: var(--nav-bg);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            flex-direction: column;
            padding: var(--space-md) var(--space-md);
            gap: var(--space-sm);
            transform: translateY(-120%);
            opacity: 0;
            pointer-events: none;
            transition: transform var(--transition-base),
                        opacity var(--transition-base);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }

        .nav-links.active {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }

        .nav-links a {
            display: block;
            font-size: 1rem;
            padding: 8px 0;
        }

        .hero {
            padding-top: calc(var(--nav-height) + var(--space-md));
            min-height: auto;
            padding-bottom: var(--space-xl);
        }

        .hero-visual {
            display: none;
        }

        .section {
            padding: var(--space-lg) var(--space-sm);
        }

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

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

    /* Desktop Alignment and Split-Column Horizontal Spreads */
    @media (min-width: 769px) {
        .footer-inner {
            flex-direction: row !important;
            justify-content: space-between !important;
            gap: 0 !important;
            padding: 0 var(--space-md);
        }

        /* 3-Column Mathematically Centered Split Layout */
        .footer-copyright {
            flex: 1;
            justify-content: flex-start !important;
        }

        .footer-powered {
            flex: 1;
            justify-content: center !important;
        }

        .footer-source {
            flex: 1;
            justify-content: flex-end !important;
        }

        .footer-separator {
            display: inline-block;
            margin: 0 0.25rem;
            color: var(--text-muted);
            opacity: 0.4;
        }
    }

    @media (max-width: 480px) {
        .hero-cta {
            flex-direction: column;
        }

        .btn {
            justify-content: center;
            width: 100%;
        }

        .section-heading {
            font-size: 1.25rem;
        }
    }
}