/* ============================================================
   Joshua Mein — Portfolio Site
   Matrix-green theme on a GitHub-dark base, with light + a11y
   ============================================================ */

/* ---------- CSS variables (themes) ---------- */
:root,
[data-theme="dark"] {
    --bg:               #0d1117;
    --bg-elev:          #161b22;
    --bg-elev-2:        #1c2128;
    --border:           #30363d;
    --border-strong:    #3d444d;
    --text:             #c9d1d9;
    --text-dim:         #8b949e;
    --text-faint:       #6e7681;
    --accent:           #00ff41;       /* Matrix green */
    --accent-dim:       #008f11;
    --accent-bright:    #39ff7a;
    --accent-glow:      rgba(0, 255, 65, 0.35);
    --accent-bg-soft:   rgba(0, 255, 65, 0.08);
    --danger:           #f85149;
    --shadow:           0 4px 24px rgba(0, 0, 0, 0.4);
    --radius:           10px;
    --radius-sm:        6px;

    --rain-opacity:     0.18;
    color-scheme: dark;
}

[data-theme="light"] {
    --bg:               #f6f8fa;
    --bg-elev:          #ffffff;
    --bg-elev-2:        #f0f3f6;
    --border:           #d0d7de;
    --border-strong:    #afb8c1;
    --text:             #1f2328;
    --text-dim:         #59636e;
    --text-faint:       #818b98;
    --accent:           #00802a;       /* darker green for AA contrast on light */
    --accent-dim:       #036120;
    --accent-bright:    #00a836;
    --accent-glow:      rgba(0, 128, 42, 0.25);
    --accent-bg-soft:   rgba(0, 128, 42, 0.08);
    --danger:           #cf222e;
    --shadow:           0 4px 18px rgba(140, 149, 159, 0.2);

    --rain-opacity:     0.06;
    color-scheme: light;
}

/* High-contrast accessibility mode (overrides on top of either theme) */
[data-a11y="true"] {
    --bg:               #000000;
    --bg-elev:          #000000;
    --bg-elev-2:        #0a0a0a;
    --border:           #ffffff;
    --border-strong:    #ffffff;
    --text:             #ffffff;
    --text-dim:         #ffffff;
    --text-faint:       #cccccc;
    --accent:           #ffff00;       /* yellow on black: max contrast */
    --accent-dim:       #cccc00;
    --accent-bright:    #ffff66;
    --accent-glow:      transparent;
    --accent-bg-soft:   #333300;
    --shadow:           none;
}

[data-a11y="true"][data-theme="light"] {
    --bg:               #ffffff;
    --bg-elev:          #ffffff;
    --bg-elev-2:        #f5f5f5;
    --border:           #000000;
    --border-strong:    #000000;
    --text:             #000000;
    --text-dim:         #000000;
    --text-faint:       #333333;
    --accent:           #b35c00;
    --accent-dim:       #804200;
    --accent-bright:    #cc6f00;
    --accent-glow:      transparent;
    --accent-bg-soft:   #fff2e0;
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

[data-a11y="true"] body { font-size: 18px; line-height: 1.7; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-shadow: 0 0 8px var(--accent-glow); }
[data-a11y="true"] a { text-decoration: underline; }

button {
    font-family: inherit;
    cursor: pointer;
    background: none;
    border: none;
    color: inherit;
}

::selection {
    background: var(--accent);
    color: var(--bg);
}

/* ---------- Matrix rain canvas ---------- */
#matrix-rain {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    opacity: var(--rain-opacity);
    transition: opacity 300ms ease;
}
[data-rain="off"] #matrix-rain,
[data-a11y="true"] #matrix-rain { opacity: 0 !important; }

@media (prefers-reduced-motion: reduce) {
    #matrix-rain { opacity: 0; }
}

/* ---------- Layout ---------- */
.app {
    position: relative;
    z-index: 1;
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 4rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main {
    flex: 1;
    margin-top: 2rem;
}

/* ---------- Header ---------- */
.header {
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    background: color-mix(in srgb, var(--bg) 70%, transparent);
    backdrop-filter: blur(6px);
}

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

.logo {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-weight: 700;
    font-size: clamp(1.15rem, 2.4vw, 1.5rem);
    color: var(--text);
    display: inline-flex;
    align-items: baseline;
    gap: 0.15rem;
    letter-spacing: 0.5px;
}
.logo:hover { text-decoration: none; color: var(--accent); }
.logo-bracket { color: var(--accent); }
.logo-cursor {
    color: var(--accent);
    animation: blink 1.05s step-end infinite;
    margin-left: 2px;
}
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .logo-cursor { animation: none; } }

.header-right { display: flex; gap: 0.4rem; }

.icon-btn {
    width: 38px;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-dim);
    background: var(--bg-elev);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: 150ms ease;
}
.icon-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}
.icon-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Theme icons swap */
.theme-icon { display: none; }
[data-theme="dark"] .theme-icon.sun { display: block; }
[data-theme="light"] .theme-icon.moon { display: block; }

/* Active state for active modes */
[data-a11y="true"] #a11y-toggle,
[data-rain="off"] #rain-toggle {
    color: var(--accent);
    border-color: var(--accent);
}

/* ---------- Nav tabs ---------- */
.nav-bar {
    display: flex;
    gap: 0.25rem;
    margin-top: 1rem;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.nav-tab {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    color: var(--text-dim);
    padding: 0.65rem 1.1rem;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: 150ms ease;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}
.nav-tab:hover { color: var(--text); background: var(--accent-bg-soft); }
.nav-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    text-shadow: 0 0 8px var(--accent-glow);
}
[data-a11y="true"] .nav-tab.active { text-shadow: none; background: var(--accent-bg-soft); }

/* External-link nav tab (e.g. Blog) — same look as a tab, but no underline-on-active */
.nav-tab-external {
    text-decoration: none;
    margin-left: auto;            /* push to the right end of the bar */
    color: var(--text-dim);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}
.nav-tab-external:hover {
    color: var(--accent);
    background: var(--accent-bg-soft);
    text-decoration: none;
}
.nav-tab-external-icon {
    font-size: 0.8em;
    opacity: 0.75;
    transition: transform 150ms ease;
}
.nav-tab-external:hover .nav-tab-external-icon {
    transform: translate(2px, -2px);
    opacity: 1;
}
@media (max-width: 560px) {
    .nav-tab-external { margin-left: 0; }
}

/* ---------- Tab content ---------- */
.tab-content { display: none; animation: fadein 250ms ease; }
.tab-content.active { display: block; }
@keyframes fadein { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .tab-content { animation: none; } }

/* ---------- About ---------- */
.about-hero { margin-top: 0.5rem; padding: 2.5rem 0 1.5rem; }
.prompt {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
    margin: 0 0 0.4rem;
    font-size: 0.95rem;
}
.about-title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin: 0 0 0.5rem;
    line-height: 1.15;
    background: linear-gradient(90deg, var(--text), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.02em;
}
[data-a11y="true"] .about-title { background: none; color: var(--accent); }
.about-subtitle { color: var(--text-dim); font-size: 1.1rem; margin: 0; }

.about-body { display: grid; gap: 2.5rem; margin-top: 2rem; }
.about-heading {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    color: var(--accent);
    margin: 0 0 1rem;
    border-left: 3px solid var(--accent);
    padding-left: 0.65rem;
}
.about-text { margin: 0 0 1rem; max-width: 70ch; }

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
}
.skill-category {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem 1.25rem;
    transition: 150ms ease;
}
.skill-category:hover { border-color: var(--accent); box-shadow: 0 0 18px var(--accent-glow); }
.skill-category-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dim);
    margin: 0 0 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.skill-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--text);
    background: var(--bg-elev-2);
    transition: 150ms ease;
}
.skill-tag.primary { color: var(--accent); border-color: var(--accent); background: var(--accent-bg-soft); }
.skill-tag.cert { color: var(--text-dim); border-style: dashed; }
.skill-tag:hover { transform: translateY(-1px); }

/* ---------- Legend ---------- */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem 1.25rem;
    align-items: center;
    margin: 0 0 1.25rem;
    padding: 0.6rem 0.85rem;
    background: var(--bg-elev-2);
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    color: var(--text-dim);
}
.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    line-height: 1;
}
.legend-swatch {
    flex-shrink: 0;
}
/* skill-tag legend swatches inherit from .skill-tag — make them tighter */
.skill-tag.legend-swatch {
    transform: none !important;
    pointer-events: none;
    font-size: 0.72rem;
    padding: 0.15rem 0.5rem;
}
/* coloured square swatches for projects/experience legends */
.legend-swatch:not(.skill-tag) {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    border: 1px solid var(--border);
    display: inline-block;
}
.legend-swatch.swatch-featured,
.legend-swatch.swatch-current {
    border-color: var(--accent);
    background: var(--accent-bg-soft);
    box-shadow: 0 0 6px var(--accent-glow);
}
.legend-swatch.swatch-default {
    background: var(--bg-elev);
}

/* ---------- Page titles ---------- */
.page-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    margin: 1rem 0 0.4rem;
    color: var(--accent);
}
.page-sub { color: var(--text-dim); margin: 0 0 2rem; }

/* ---------- Projects grid ---------- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}
.project-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.4rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    transition: 180ms ease;
    position: relative;
    overflow: hidden;
}
.project-card.featured {
    grid-column: span 2;
    border-color: var(--accent);
    box-shadow: 0 0 22px var(--accent-glow);
}
@media (max-width: 720px) {
    .project-card.featured { grid-column: span 1; }
}
.project-card.clickable { cursor: pointer; }
.project-card.clickable:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: 0 6px 28px var(--accent-glow);
}
.project-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-bg-soft) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 200ms ease;
    pointer-events: none;
}
.project-card.clickable:hover::before { opacity: 1; }

.project-header {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}
.project-icon { font-size: 1.5rem; line-height: 1; }
.project-name { margin: 0; font-size: 1.15rem; color: var(--text); }
.project-description { margin: 0; color: var(--text-dim); font-size: 0.95rem; }
.project-tech { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.tech-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    padding: 0.18rem 0.5rem;
    border-radius: 4px;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    color: var(--text-dim);
}
.project-links { display: flex; gap: 0.6rem; margin-top: auto; }
.project-link {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    padding: 0.3rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    transition: 150ms ease;
}
.project-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    text-decoration: none;
    box-shadow: 0 0 10px var(--accent-glow);
}
.project-dive-hint {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-faint);
    margin-top: 0.2rem;
}
.project-dive-hint::before { content: '> '; color: var(--accent); }

/* ---------- Experience timeline ---------- */
.timeline {
    list-style: none;
    padding: 0;
    margin: 0;
    position: relative;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 4px;
    bottom: 4px;
    width: 2px;
    background: var(--border);
}
.timeline-item {
    position: relative;
    padding-left: 2.25rem;
    padding-bottom: 1.5rem;
}
.timeline-dot {
    position: absolute;
    left: 0;
    top: 0.6rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--border-strong);
}
.timeline-item.current .timeline-dot {
    border-color: var(--accent);
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
    animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
    50% { box-shadow: 0 0 0 8px transparent; }
}
@media (prefers-reduced-motion: reduce) { .timeline-item.current .timeline-dot { animation: none; } }

.timeline-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem 1.25rem;
}
.timeline-item.current .timeline-card { border-color: var(--accent); }
.role-header { margin-bottom: 0.6rem; }
.role-title { margin: 0; font-size: 1.1rem; color: var(--text); }
.role-company { display: block; color: var(--accent); font-size: 0.95rem; font-weight: 500; margin-top: 0.1rem; }
.role-meta {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-faint);
    margin-top: 0.2rem;
}
.role-bullets { margin: 0.5rem 0 0; padding-left: 1.1rem; color: var(--text-dim); }
.role-bullets li { margin-bottom: 0.35rem; }
.role-bullets strong { color: var(--text); }

/* ---------- Contact ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    max-width: 740px;
}
.contact-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
    padding: 1.4rem;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    transition: 150ms ease;
}
.contact-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px var(--accent-glow);
    text-decoration: none;
}
.contact-icon {
    font-size: 1.5rem;
    color: var(--accent);
    width: 40px;
    height: 40px;
    border: 1px solid var(--accent);
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
}
.contact-label { font-weight: 600; }
.contact-handle { font-family: 'JetBrains Mono', monospace; color: var(--text-dim); font-size: 0.85rem; }

/* ---------- Modal ---------- */
.modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.modal.open { display: flex; }
.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(3px);
}
.modal-panel {
    position: relative;
    background: var(--bg-elev);
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    box-shadow: 0 8px 40px var(--accent-glow), var(--shadow);
    max-width: 760px;
    width: 100%;
    max-height: 85vh;
    overflow: auto;
    padding: 2rem 2rem 2.5rem;
}
.modal-close {
    position: absolute;
    top: 0.5rem;
    right: 0.65rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--text-dim);
    font-size: 1.6rem;
    line-height: 1;
}
.modal-close:hover { color: var(--accent); background: var(--accent-bg-soft); }
.modal-content h2 {
    margin-top: 0;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}
.modal-content h3 {
    margin-top: 1.5rem;
    color: var(--text);
    font-size: 1.05rem;
    border-left: 3px solid var(--accent);
    padding-left: 0.6rem;
}
.modal-content ul { color: var(--text-dim); }
.modal-content code {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.05rem 0.35rem;
    font-size: 0.9em;
    color: var(--accent);
}

/* ---------- Footer ---------- */
.footer {
    margin-top: 4rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--text-faint);
    font-size: 0.85rem;
    font-family: 'JetBrains Mono', monospace;
    text-align: center;
}