/* ==========================================================================
   Design tokens — dark, precise, F1-team-inspired (carbon, red, clean data)
   ========================================================================== */
:root {
    --bg: #0a0b0e;
    --bg-raised: #0f1116;
    --bg-card: #12141b;
    --line: rgba(255, 255, 255, 0.09);
    --line-strong: rgba(255, 255, 255, 0.16);
    --text: #eceef1;
    --text-muted: #a3a9b3;
    --text-faint: #6d7480;
    --accent: #e10600;
    --accent-bright: #ff3b33;
    --accent-glow: rgba(225, 6, 0, 0.35);
    --font-sans: "Titillium Web", "Segoe UI", system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
    --radius: 4px;
    --chamfer: 14px;
    --content-width: 1080px;
    --header-height: 64px;
}

/* ==========================================================================
   Base
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 16px);
}

body {
    margin: 0;
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1, h2, h3 {
    line-height: 1.15;
    letter-spacing: -0.01em;
    margin: 0;
}

p {
    margin: 0;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
}

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

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

.skip-link {
    position: absolute;
    top: -48px;
    left: 12px;
    z-index: 100;
    padding: 10px 16px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    transition: top 0.15s ease;
}

.skip-link:focus {
    top: 12px;
}

/* ==========================================================================
   Header / navigation
   ========================================================================== */
.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 50;
    height: var(--header-height);
    border-bottom: 1px solid transparent;
    transition: background-color 0.25s ease, border-color 0.25s ease;
}

.site-header.scrolled,
.site-header.nav-open {
    background: rgba(10, 11, 14, 0.82);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-bottom-color: var(--line);
}

.header-inner {
    max-width: var(--content-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.95rem;
}

.brand-mark {
    width: 22px;
    height: 14px;
    background: var(--accent);
    clip-path: polygon(0 100%, 35% 0, 100% 0, 65% 100%);
}

.primary-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    position: relative;
    padding: 8px 12px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.86rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition: color 0.2s ease;
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 2px;
    height: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s ease;
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: none;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    cursor: pointer;
}

.nav-toggle-bar {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--text);
    transition: transform 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child {
    transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child {
    transform: translateY(-4px) rotate(-45deg);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
    position: relative;
    padding: calc(var(--header-height) + 64px) 24px 0;
    background:
        radial-gradient(1000px 480px at 78% -10%, rgba(225, 6, 0, 0.09), transparent 65%),
        var(--bg);
    overflow: hidden;
}

/* Subtle carbon-weave texture, pure CSS */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(45deg, rgba(255, 255, 255, 0.012) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.012) 75%),
        linear-gradient(-45deg, rgba(255, 255, 255, 0.012) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.012) 75%);
    background-size: 8px 8px;
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--line) 1px, transparent 1px),
        linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 72px 72px;
    opacity: 0.16;
    -webkit-mask-image: radial-gradient(720px 480px at 30% 20%, #000 0%, transparent 75%);
    mask-image: radial-gradient(720px 480px at 30% 20%, #000 0%, transparent 75%);
    pointer-events: none;
}

.hero-inner {
    position: relative;
    max-width: var(--content-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 56px;
    align-items: center;
    padding-bottom: 72px;
}

.kicker {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-bright);
    margin-bottom: 20px;
}

.kicker-line {
    width: 36px;
    height: 2px;
    background: var(--accent);
    flex-shrink: 0;
}

.hero-title {
    font-size: clamp(2.8rem, 7vw, 4.6rem);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.005em;
}

.hero-title-accent {
    color: transparent;
    -webkit-text-stroke: 1.5px rgba(236, 238, 241, 0.85);
}

.hero-tagline {
    margin-top: 24px;
    max-width: 48ch;
    color: var(--text-muted);
    font-size: 1.1rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 36px;
}

.hero-portrait {
    position: relative;
    justify-self: end;
    max-width: 340px;
    width: 100%;
}

.hero-portrait img {
    width: 100%;
    clip-path: polygon(var(--chamfer) 0, 100% 0, 100% calc(100% - var(--chamfer)), calc(100% - var(--chamfer)) 100%, 0 100%, 0 var(--chamfer));
    filter: saturate(0.92);
}

.portrait-corner {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 72px;
    height: 72px;
    border-top: 2px solid var(--accent);
    border-right: 2px solid var(--accent);
    pointer-events: none;
}

/* Telemetry-style stat strip */
.hero-stats {
    position: relative;
    max-width: var(--content-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--line);
}

.stat {
    padding: 24px 20px 28px;
    display: grid;
    gap: 4px;
}

.stat + .stat {
    border-left: 1px solid var(--line);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--text);
}

.stat-label {
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-faint);
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section {
    padding: 88px 24px;
}

.section-alt {
    background: var(--bg-raised);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

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

.section-header {
    display: grid;
    gap: 10px;
    margin-bottom: 44px;
}

.section-index {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    color: var(--accent-bright);
}

.section-index::after {
    content: " /";
    color: var(--text-faint);
}

.section-header h2 {
    font-size: clamp(1.7rem, 3.5vw, 2.3rem);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.section-summary {
    max-width: 62ch;
    color: var(--text-muted);
}

/* ==========================================================================
   Cards & shared components
   ========================================================================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px 28px;
    clip-path: polygon(var(--chamfer) 0, 100% 0, 100% 100%, 0 100%, 0 var(--chamfer));
    transition: border-color 0.25s ease, transform 0.25s ease;
}

.card:hover {
    border-color: var(--line-strong);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 26px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: var(--radius);
    clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease;
    will-change: transform;
}

.btn:hover {
    transform: translateY(-2px);
}

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

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

.btn-primary:hover {
    box-shadow: 0 8px 28px var(--accent-glow);
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--line-strong);
}

.btn-ghost:hover {
    border-color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
}

.text-link {
    color: var(--accent-bright);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.text-link:hover {
    border-bottom-color: var(--accent-bright);
}

.tag-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0;
    padding: 0;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--line);
    border-radius: 3px;
    padding: 4px 10px;
    white-space: nowrap;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.card:hover .tag {
    border-color: var(--line-strong);
}

/* ==========================================================================
   About
   ========================================================================== */
.about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
}

.about-body {
    display: grid;
    gap: 18px;
    color: var(--text-muted);
    font-size: 1.05rem;
}

.about-body p:first-child {
    color: var(--text);
}

.fact-grid {
    margin: 0;
    display: grid;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--bg-card);
    clip-path: polygon(var(--chamfer) 0, 100% 0, 100% 100%, 0 100%, 0 var(--chamfer));
}

.fact {
    padding: 16px 20px;
    display: grid;
    gap: 2px;
}

.fact + .fact {
    border-top: 1px solid var(--line);
}

.fact dt {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-bright);
}

.fact dd {
    margin: 0;
    font-weight: 600;
}

.highlight-strip {
    list-style: none;
    margin: 44px 0 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.highlight-strip li {
    position: relative;
    background: var(--bg-raised);
    padding: 18px 20px 18px 34px;
    font-size: 0.92rem;
    color: var(--text-muted);
}

.highlight-strip li::before {
    content: "";
    position: absolute;
    left: 18px;
    top: 26px;
    width: 7px;
    height: 7px;
    background: var(--accent);
    clip-path: polygon(0 100%, 40% 0, 100% 0, 60% 100%);
}

/* ==========================================================================
   Experience timeline
   ========================================================================== */
.timeline {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 28px;
    position: relative;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(var(--accent) 0%, var(--line) 45%, var(--line) 100%);
}

.timeline-item {
    position: relative;
    padding-left: 40px;
}

.timeline-marker {
    position: absolute;
    left: 0;
    top: 26px;
    width: 15px;
    height: 15px;
    border: 2px solid var(--accent);
    background: var(--bg);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--bg), 0 0 12px var(--accent-glow);
}

.role-card {
    display: grid;
    gap: 16px;
}

.role-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
    flex-wrap: wrap;
}

.role-kind {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-bright);
    margin-bottom: 6px;
}

.role-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.role-org {
    color: var(--text-muted);
    font-weight: 600;
    margin-top: 2px;
}

.role-period {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-faint);
    white-space: nowrap;
}

.role-summary {
    color: var(--text-muted);
}

.role-highlights {
    margin: 0;
    padding: 0 0 0 18px;
    display: grid;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.role-highlights li::marker {
    color: var(--accent);
}

/* ==========================================================================
   Skills
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.skill-card {
    display: grid;
    gap: 16px;
    align-content: start;
}

.skill-card h3 {
    font-size: 1.05rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--line);
}

/* ==========================================================================
   Education
   ========================================================================== */
.education-card {
    display: grid;
    gap: 14px;
    border-left: 3px solid var(--accent);
}

/* ==========================================================================
   Interests
   ========================================================================== */
.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.interest-card {
    padding: 0;
    overflow: hidden;
    display: grid;
    grid-template-rows: auto 1fr;
}

.interest-media {
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.interest-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: saturate(0.85);
    transition: transform 0.45s ease, filter 0.45s ease;
    will-change: transform;
}

.interest-card:hover .interest-media img {
    transform: scale(1.04);
    filter: saturate(1);
}

.interest-body {
    padding: 20px 22px 24px;
    display: grid;
    gap: 8px;
    align-content: start;
}

/* Text-only interest cards center their content in the available space */
.interest-card > .interest-body:only-child {
    grid-row: 1 / -1;
    align-content: center;
    border-top: 3px solid var(--accent);
}

.interest-body h3 {
    font-size: 1.05rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.interest-body p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ==========================================================================
   Contact
   ========================================================================== */
.section-contact {
    background:
        radial-gradient(720px 320px at 50% 110%, rgba(225, 6, 0, 0.1), transparent 70%),
        var(--bg);
}

.contact-card {
    text-align: center;
    padding: 48px 28px;
    display: grid;
    gap: 28px;
    justify-items: center;
}

.contact-lede {
    max-width: 52ch;
    color: var(--text-muted);
    font-size: 1.08rem;
}

.contact-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
}

.contact-actions .btn {
    text-transform: none;
    letter-spacing: 0.02em;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    border-top: 1px solid var(--line);
    padding: 32px 24px;
}

.footer-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.footer-name {
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.footer-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-faint);
}

.footer-links {
    display: flex;
    gap: 18px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--text);
}

/* ==========================================================================
   Map page
   ========================================================================== */
.page-hero {
    padding: calc(var(--header-height) + 56px) 24px 40px;
}

.page-hero .section-inner {
    display: grid;
    gap: 10px;
}

.page-hero h1 {
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    font-weight: 900;
    text-transform: uppercase;
}

.map-root {
    width: 100%;
    min-height: 560px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--bg-card);
    clip-path: polygon(var(--chamfer) 0, 100% 0, 100% 100%, 0 100%, 0 var(--chamfer));
}

.map-root .leaflet-tile-pane {
    filter: saturate(0.7);
}

/* ==========================================================================
   Admin
   ========================================================================== */
.admin-section {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: calc(var(--header-height) + 48px) 24px 72px;
    display: grid;
    gap: 24px;
}

.admin-section h1 {
    font-size: 1.8rem;
    text-transform: uppercase;
}

.admin-intro {
    color: var(--text-muted);
}

.json-editor {
    width: 100%;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    padding: 12px;
    background: var(--bg);
}

.admin-label {
    display: block;
    font-weight: 600;
    margin: 14px 0 6px;
}

.admin-actions {
    margin-top: 14px;
    display: flex;
    justify-content: flex-end;
}

.admin-actions button {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    padding: 10px 20px;
    font-family: var(--font-sans);
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    cursor: pointer;
}

.success-note {
    padding: 12px 14px;
    border-radius: var(--radius);
    border: 1px solid rgba(74, 222, 128, 0.4);
    background: rgba(74, 222, 128, 0.08);
    color: #86efac;
}

.error-note {
    padding: 12px 14px;
    border-radius: var(--radius);
    border: 1px solid rgba(248, 113, 113, 0.4);
    background: rgba(248, 113, 113, 0.08);
    color: #fca5a5;
}

/* ==========================================================================
   Scroll-reveal (JS-gated, GPU-friendly, honors reduced motion)
   ========================================================================== */
html.js .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.55s ease, transform 0.55s ease;
    will-change: opacity, transform;
}

html.js .reveal.is-visible {
    opacity: 1;
    transform: none;
    will-change: auto;
}

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

    html.js .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

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

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 880px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 44px;
    }

    .hero-portrait {
        justify-self: start;
        max-width: 280px;
    }

    .about-layout {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 720px) {
    .nav-toggle {
        display: flex;
    }

    .primary-nav {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        padding: 8px 16px 20px;
        background: var(--bg);
        border-bottom: 1px solid var(--line);
        display: none;
    }

    .site-header.nav-open .primary-nav {
        display: flex;
    }

    .nav-link {
        padding: 14px 8px;
        border-bottom: 1px solid var(--line);
    }

    .nav-link::after {
        display: none;
    }

    .section {
        padding: 64px 20px;
    }

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

    .stat + .stat {
        border-left: none;
        border-top: 1px solid var(--line);
    }

    .role-head {
        flex-direction: column;
        gap: 6px;
    }

    .timeline-item {
        padding-left: 32px;
    }
}