/* ── Color system ──
   Dark (default): WCAG 2.1 AAA throughout
   Light mode:     WCAG 2.1 AA throughout        */
:root {
    --c-bg:               #000000;
    --c-bg-card:          #0d0d0d;
    --c-text:             #ffffff;
    --c-muted:            #cccccc;
    --c-border:           #888888;
    --c-link:             #ffff00;
    --c-link-hover:       #ffe566;
    --c-btn-primary:      #ffff00;
    --c-btn-primary-fg:   #000000;
    --c-btn-primary-hv:   #ffe566;
    --c-btn-secondary:    transparent;
    --c-btn-secondary-fg: #ffffff;
    --c-btn-secondary-bd: #ffffff;
    --c-btn-secondary-hv: rgba(255,255,255,0.08);
    --c-badge-tech:       #ffffff;
    --c-badge-tech-fg:    #000000;
    --c-badge-accent:     #ffff00;
    --c-badge-accent-fg:  #000000;
    --c-focus-ring:       #ffffff;
    --c-error:            #ff8080;
    --nav-height:         64px;
}

@media (prefers-color-scheme: light) {
    :root {
        --c-bg:               #ffffff;
        --c-bg-card:          #f2f2f2;
        --c-text:             #111111;
        --c-muted:            #444444;
        --c-border:           #767676;
        --c-link:             #0055cc;
        --c-link-hover:       #003d99;
        --c-btn-primary:      #0055cc;
        --c-btn-primary-fg:   #ffffff;
        --c-btn-primary-hv:   #003d99;
        --c-btn-secondary:    transparent;
        --c-btn-secondary-fg: #111111;
        --c-btn-secondary-bd: #111111;
        --c-btn-secondary-hv: rgba(0,0,0,0.06);
        --c-badge-tech:       #111111;
        --c-badge-tech-fg:    #ffffff;
        --c-badge-accent:     #0055cc;
        --c-badge-accent-fg:  #ffffff;
        --c-focus-ring:       #000000;
        --c-error:            #b30000;
    }
}

html {
    scroll-behavior: smooth;
}

html, body {
    background-color: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
}

/* Alpine.js: hide x-cloak elements until Alpine initialises, preventing flash of unstyled content */
[x-cloak] { display: none !important; }

p, li { letter-spacing: 0.012em; word-spacing: 0.16em; }

h1, h2, h3, h4, h5, h6 {
    color: var(--c-text);
    letter-spacing: 0;
    word-spacing: 0;
}

abbr[title] { text-decoration: underline dotted; cursor: help; }

a {
    color: var(--c-link);
    text-decoration: underline;
}

a:hover,
a:focus { color: var(--c-link-hover); }

/* 2.4.1 Bypass Blocks */
.skip-link {
    position: fixed;
    left: 1rem;
    top: -100%;
    z-index: 200;
    background-color: var(--c-btn-primary);
    color: var(--c-btn-primary-fg);
    font-weight: 700;
    padding: 0.75rem 1.5rem;
    border-bottom-left-radius: 0.5rem;
    border-bottom-right-radius: 0.5rem;
    text-decoration: none;
    transition: top 0.1s ease;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--c-btn-primary-fg);
    outline-offset: 0;
}

/* ── Sticky nav ── */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--nav-height);
    background-color: var(--c-bg);
    border-bottom: 1px solid var(--c-border);
    display: flex;
    align-items: center;
}

/* Centered content container */
.container {
    width: 100%;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 2rem;
    padding-right: 2rem;
}

/* Nav inner layout */
.nav-inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}

.nav-brand {
    font-size: 1rem;
    font-weight: 700;
    color: var(--c-text);
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-brand:hover,
.nav-brand:focus { color: var(--c-link); text-decoration: none; }

.nav-brand:focus {
    outline: 3px solid var(--c-link);
    outline-offset: 3px;
    border-radius: 2px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.125rem;
    margin-left: auto;
}

/* Nav links — 2.5.5 min 44px touch target */
.nav-link {
    display: flex;
    align-items: center;
    padding: 0.625rem 0.75rem;
    border-radius: 0.25rem;
    color: var(--c-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.15s ease;
    min-height: 44px;
}

.nav-link:hover {
    color: var(--c-text);
    text-decoration: none;
}

.nav-link:focus {
    color: var(--c-text);
    outline: 3px solid var(--c-link);
    outline-offset: 3px;
    text-decoration: none;
}

/* 2.4.8 Location */
.nav-link[aria-current="page"] {
    color: var(--c-link);
    font-weight: 600;
}

.nav-social {
    display: flex;
    align-items: center;
    gap: 0.125rem;
    margin-left: 1rem;
    padding-left: 1rem;
    border-left: 1px solid var(--c-border);
}

/* Mobile toggle */
.nav-toggle {
    display: none;
    margin-left: auto;
}

/* 2.4.3 Focus Order — explicitly remove hidden mobile nav from accessibility
   tree and tab order when closed. display:none removes from both the visual
   rendering and the a11y tree (unlike visibility:hidden which only does the latter). */
.nav-hidden {
    display: none !important;
}

/* Mobile nav dropdown — hidden on desktop by default */
.nav-mobile-dropdown {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--c-bg);
    border-bottom: 1px solid var(--c-border);
    padding: 1rem 2rem 1.25rem;
    z-index: 40;
}

/* ── Sections ── */

/* scroll-margin-top offsets the sticky nav when jumping to anchors */
section[id] {
    scroll-margin-top: var(--nav-height);
}

.content-section {
    padding: 5rem 0;
    border-bottom: 1px solid var(--c-border);
}

.content-section:last-child {
    border-bottom: none;
}

.section-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--c-muted);
    margin-bottom: 1.75rem;
}

/* ── Hero ── */
.hero-section {
    padding: 6rem 0 5rem;
    border-bottom: 1px solid var(--c-border);
}

.hero-name {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 0.75rem;
}

.hero-role {
    font-size: 1.1rem;
    color: var(--c-muted);
    margin-bottom: 0.375rem;
}

.hero-tagline {
    font-size: 1rem;
    color: var(--c-muted);
    max-width: 480px;
    margin-top: 1rem;
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

/* ── Buttons ── */
.btn-primary {
    display: inline-flex;
    align-items: center;
    font-weight: 700;
    padding: 0.75rem 1.5rem;
    border-radius: 0.25rem;
    text-decoration: none;
    background-color: var(--c-btn-primary);
    color: var(--c-btn-primary-fg);
    transition: background-color 0.2s ease;
    min-height: 44px; /* 2.5.5 Target Size */
}

.btn-primary:hover {
    background-color: var(--c-btn-primary-hv);
    color: var(--c-btn-primary-fg);
    text-decoration: none;
}

.btn-primary:focus {
    background-color: var(--c-btn-primary-hv);
    color: var(--c-btn-primary-fg);
    outline: 3px solid var(--c-focus-ring);
    outline-offset: 3px;
    text-decoration: none;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    font-weight: 700;
    padding: 0.75rem 1.5rem;
    border-radius: 0.25rem;
    text-decoration: none;
    background-color: var(--c-btn-secondary);
    color: var(--c-btn-secondary-fg);
    border: 2px solid var(--c-btn-secondary-bd);
    transition: background-color 0.2s ease;
    min-height: 44px; /* 2.5.5 Target Size */
}

.btn-secondary:hover {
    background-color: var(--c-btn-secondary-hv);
    color: var(--c-btn-secondary-fg);
    text-decoration: none;
}

.btn-secondary:focus {
    background-color: var(--c-btn-secondary-hv);
    color: var(--c-btn-secondary-fg);
    outline: 3px solid var(--c-focus-ring);
    outline-offset: 3px;
    text-decoration: none;
}

/* ── Badges ── */
.badge {
    display: inline-block;
    font-weight: 500;
    border-radius: 0.25rem;
    font-size: 0.85rem;
    padding: 0.4rem 0.6rem;
}

.badge-tech {
    background-color: var(--c-badge-tech);
    color: var(--c-badge-tech-fg);
}

.badge-accent {
    background-color: var(--c-badge-accent);
    color: var(--c-badge-accent-fg);
}

/* ── Skills ── */
.skills-dl {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem 3rem;
}

.skills-entry dt {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--c-text);
    margin-bottom: 0.375rem;
}

.skills-entry dd {
    color: var(--c-muted);
    margin: 0;
    line-height: 1.6;
}

/* ── Education ── */
.edu-entry + .edu-entry {
    margin-top: 2.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--c-border);
}

/* ── Footer ── */
footer {
    background-color: var(--c-bg);
    border-top: 1px solid var(--c-border);
    padding: 1.5rem 0;
}

footer a {
    color: var(--c-text);
}

footer a:hover,
footer a:focus {
    color: var(--c-link);
}

/* 2.3.3 Animation from Interactions */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ── Windows Forced Colors (High Contrast Mode) ──
   The site's dark palette (black/yellow) is already designed for high contrast,
   so we preserve it with forced-color-adjust: none on key interactive elements
   rather than letting the OS palette replace the yellow buttons/links.      */
@media (forced-colors: active) {
    .btn-primary {
        forced-color-adjust: none;
        background-color: #ffff00;
        color: #000000;
        border: 2px solid ButtonText;
    }

    .btn-secondary {
        border: 2px solid ButtonText;
        color: ButtonText;
    }

    a { color: LinkText; }
    a:hover, a:focus { color: LinkText; }

    .skip-link {
        forced-color-adjust: none;
        background-color: #ffff00;
        color: #000000;
        border: 2px solid ButtonText;
    }

    .nav-link[aria-current="page"] {
        text-decoration: underline;
        text-decoration-thickness: 2px;
        color: LinkText;
    }

    .btn-primary:focus,
    .btn-secondary:focus,
    .nav-link:focus,
    .nav-brand:focus {
        outline: 3px solid Highlight;
        outline-offset: 3px;
    }
}

/* ── Contact Form ── */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.375rem;
    color: var(--c-text);
}

.form-required {
    color: var(--c-link);
}

.form-input,
.form-textarea {
    display: block;
    width: 100%;
    background-color: var(--c-bg-card);
    color: var(--c-text);
    border: 1px solid var(--c-border);
    border-radius: 0.25rem;
    padding: 0.625rem 0.75rem;
    font-size: 1rem;
    font-family: inherit;
}

.form-input:focus,
.form-textarea:focus {
    outline: 3px solid var(--c-focus-ring);
    outline-offset: 2px;
    border-color: var(--c-link);
}

.form-input[aria-invalid="true"],
.form-textarea[aria-invalid="true"] {
    border: 2px solid var(--c-error);
}

.form-error {
    display: block;
    font-size: 0.85rem;
    color: var(--c-error);
    margin-top: 0.3rem;
}

.form-error:empty { display: none; }

.form-textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.5;
}

.form-server-error {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--c-error);
}

.form-server-error:empty { display: none; }

.contact-success {
    background-color: var(--c-bg-card);
    border: 2px solid var(--c-link);
    border-radius: 0.5rem;
    padding: 2rem;
}

.contact-intro { margin-bottom: 1.5rem; }

.form-required-note { margin-bottom: 1.25rem; }

.contact-direct-label { margin-bottom: 1rem; }

.contact-success-title {
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
}

.contact-success-body { color: var(--c-muted); }

/* ── Mobile ── */
@media (max-width: 767px) {
    .nav-links,
    .nav-social {
        display: none;
    }

    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Show dropdown on mobile only when open (no .nav-hidden class) */
    .nav-mobile-dropdown:not(.nav-hidden) {
        display: block;
    }

    .content-section {
        padding: 3rem 0;
    }

    .hero-section {
        padding: 3.5rem 0 3rem;
    }

    .skills-dl {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .contact-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}