/* ============================================================
   xar8.online — design system
   Light shell + light content, subtle terminal accents.
   Dark treatment (.deep-page) reserved for technical detail pages.
============================================================ */

:root {
    --green: #1aa179;          /* terminal green, darkened for AA contrast on light */
    --green-bright: #2dd496;   /* bright green, for dark pages / accents on dark */
    --ink: #16243a;            /* near-black navy for headings */
    --body: #3a4a5e;           /* body text */
    --muted: #6a7888;          /* secondary text */
    --hint: #8a98a8;           /* tertiary / metadata */
    --line: #e4e9ef;           /* hairline borders */
    --line-soft: #eef2f6;
    --surface: #ffffff;
    --page: #f7f8fa;
    --link: #1d6fa5;

    --shell-bg: #ffffff;
    --shell-border: #e4e9ef;

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'IBM Plex Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--page);
    color: var(--body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main { flex: 1 0 auto; }

a { color: var(--link); text-decoration: none; }

/* ---------- Shell bar (persistent, light) ---------- */
.shell-bar {
    background: var(--shell-bg);
    border-bottom: 1px solid var(--shell-border);
    padding: 14px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}
.shell-brand {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--ink);
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.02em;
}
.shell-brand .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 0 0 rgba(26,161,121,0.4);
    animation: pulse 2.4s infinite;
}
@keyframes pulse {
    0%   { box-shadow: 0 0 0 0 rgba(26,161,121,0.35); }
    70%  { box-shadow: 0 0 0 6px rgba(26,161,121,0); }
    100% { box-shadow: 0 0 0 0 rgba(26,161,121,0); }
}
.shell-nav { display: flex; gap: 22px; }
.shell-nav a {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--muted);
    transition: color 0.2s;
}
.shell-nav a:hover { color: var(--green); }
.shell-nav a.active { color: var(--ink); }

/* ---------- Footer ---------- */
.site-footer {
    flex-shrink: 0;
    border-top: 1px solid var(--line);
    background: var(--surface);
    padding: 20px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--hint);
}
.site-footer .foot-mono { font-family: var(--font-mono); font-size: 0.72rem; }

/* ---------- Shared building blocks ---------- */
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 40px; }

.kicker {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.1em;
    color: var(--green);
    margin-bottom: 18px;
}
.kicker.cmd::before { content: "$ "; color: var(--hint); }

.col-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--green);
    margin-bottom: 22px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--line);
    position: relative;
}
.col-label::after {
    content: ""; position: absolute; bottom: -2px; left: 0;
    width: 40px; height: 2px; background: var(--green);
}

/* ---------- Landing ---------- */
.landing { padding: 80px 0 90px; }
.landing h1 {
    font-family: var(--font-display);
    font-size: 3.6rem;
    font-weight: 700;
    line-height: 1.02;
    letter-spacing: -0.025em;
    color: var(--ink);
    margin-bottom: 18px;
}
.landing .tagline {
    font-size: 1.24rem;
    line-height: 1.5;
    color: var(--body);
    max-width: 620px;
    margin-bottom: 16px;
}
.landing .contact {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--muted);
    margin-bottom: 50px;
}
.landing .contact a { color: var(--green); }

.doors { display: flex; gap: 20px; flex-wrap: wrap; }
.door {
    flex: 1; min-width: 250px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 30px 32px;
    transition: all 0.3s cubic-bezier(.4,0,.2,1);
    position: relative;
    overflow: hidden;
    display: block;
    color: inherit;
}
.door::after {
    content: ""; position: absolute; top: 0; left: 0;
    width: 100%; height: 3px; background: var(--green);
    transform: scaleX(0); transform-origin: left;
    transition: transform 0.35s ease;
}
.door:hover::after { transform: scaleX(1); }
.door:hover {
    border-color: #c8d2dc;
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(22,36,58,0.09);
}
.door .dk {
    font-family: var(--font-mono);
    font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--green); margin-bottom: 12px;
}
.door h2 {
    font-family: var(--font-display);
    font-size: 1.6rem; font-weight: 600; color: var(--ink); margin-bottom: 8px;
}
.door p { font-size: 0.96rem; color: var(--muted); line-height: 1.55; }
.door .arrow {
    font-family: var(--font-mono);
    margin-top: 18px; font-size: 0.8rem; color: var(--green); font-weight: 500;
}

/* ---------- Content pages (industry / academic) ---------- */
.page-head {
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 40px 0 34px;
}
.breadcrumb {
    font-family: var(--font-mono);
    font-size: 0.72rem; color: var(--hint); margin-bottom: 14px;
}
.breadcrumb .sep { color: #c0cad4; margin: 0 8px; }
.breadcrumb .cur { color: var(--link); }
.page-head h1 {
    font-family: var(--font-display);
    font-size: 2.2rem; font-weight: 700; color: var(--ink);
    letter-spacing: -0.02em; margin-bottom: 6px;
}
.page-head .sub { font-size: 1.04rem; color: var(--muted); }

.page-body {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 52px;
    padding: 46px 0 64px;
}

.role { margin-bottom: 28px; }
.role .rtitle {
    font-family: var(--font-display);
    font-size: 1.1rem; font-weight: 600; color: var(--ink);
}
.role .rmeta {
    font-family: var(--font-mono);
    font-size: 0.82rem; color: var(--link); font-weight: 500; margin: 3px 0 8px;
}
.role .rdesc { font-size: 0.95rem; color: var(--body); line-height: 1.6; }
.role .rdesc a {
    color: var(--link);
    border-bottom: 1px solid #b8d4e8;
    transition: border-color 0.2s;
}
.role .rdesc a:hover { border-bottom-color: var(--link); }

.edu-item { margin-bottom: 18px; }
.edu-item .etitle { font-weight: 600; color: var(--ink); font-size: 0.98rem; }
.edu-item .emeta { font-family: var(--font-mono); font-size: 0.84rem; color: var(--muted); }

.skill-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: 9px 0; border-bottom: 1px solid var(--line-soft); font-size: 0.92rem;
}
.skill-row .sname { color: #2a3a4e; }
.skill-row .syrs { font-family: var(--font-mono); font-size: 0.8rem; color: var(--green); font-weight: 500; }

.deep-link {
    display: inline-block; margin-top: 10px;
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--link);
    border: 1px solid #c8dce8; border-radius: 6px;
    padding: 6px 13px; transition: all 0.2s;
}
.deep-link:hover { background: var(--link); color: #fff; border-color: var(--link); }

/* ---------- Contact ---------- */
.contact-page { padding: 70px 0 80px; }
.contact-row {
    display: flex; align-items: center; gap: 14px;
    padding: 14px 0; border-bottom: 1px solid var(--line);
    font-size: 1.02rem;
}
.contact-row .clabel {
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--hint);
    min-width: 90px; text-transform: uppercase; letter-spacing: 0.08em;
}
.contact-row a { color: var(--link); }

/* ============================================================
   DARK technical detail pages — .deep-page on <body>
   (reserved for code, diagrams, dissertation math, tooling)
============================================================ */
body.deep-page { background: #0c0f14; color: #aeb8c4; }
body.deep-page .shell-bar {
    background: #0c0f14; border-bottom-color: #1c232e;
}
body.deep-page .shell-brand { color: #f0f4f8; }
body.deep-page .shell-nav a { color: #6a7888; }
body.deep-page .shell-nav a:hover { color: var(--green-bright); }
body.deep-page .shell-nav a.active { color: #f0f4f8; }
body.deep-page .site-footer {
    background: #0c0f14; border-top-color: #1c232e; color: #5a6678;
}

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
    .wrap { padding: 0 24px; }
    .shell-bar { padding: 12px 20px; }
    .shell-nav { gap: 16px; }
    .landing { padding: 50px 0 60px; }
    .landing h1 { font-size: 2.4rem; }
    .page-body { grid-template-columns: 1fr; gap: 34px; }
}
@media (max-width: 480px) {
    .shell-nav a { font-size: 0.74rem; }
    .landing h1 { font-size: 2rem; }
}

/* ============================================================
   Landing makeover — hero + three commercial-style cards
   (replaces the old .landing / .doors / .door terminal block)
============================================================ */

/* ---------- Hero ---------- */
.landing-hero { padding: 76px 0 8px; }
.landing-hero h1 {
    font-family: var(--font-display);
    font-size: 3.6rem;
    font-weight: 700;
    line-height: 1.02;
    letter-spacing: -0.025em;
    color: var(--ink);
    margin-bottom: 18px;
}
.landing-hero .tagline {
    font-size: 1.24rem;
    line-height: 1.5;
    color: var(--body);
    max-width: 620px;
    margin-bottom: 16px;
}
.landing-hero .contact {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--muted);
}
.landing-hero .contact a { color: var(--green); }

/* ---------- Cards row ---------- */
.cards-section { padding: 44px 0 90px; }
.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
}

.card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 18px;
    overflow: hidden;
    color: inherit;
    box-shadow: 0 1px 2px rgba(22,36,58,0.04),
                0 8px 24px rgba(22,36,58,0.05);
    transition: transform 0.32s cubic-bezier(.4,0,.2,1),
                box-shadow 0.32s cubic-bezier(.4,0,.2,1);
}
.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 6px 14px rgba(22,36,58,0.08),
                0 26px 56px rgba(22,36,58,0.16);
}

/* gradient header band — each card gets its own identity */
.card-band {
    height: 116px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.card-band::after {           /* soft sheen sweep */
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(255,255,255,0.22) 0%, rgba(255,255,255,0) 42%);
}
.card-glyph {
    font-size: 2.6rem;
    color: rgba(255,255,255,0.95);
    line-height: 1;
    position: relative;
    z-index: 1;
    transition: transform 0.32s cubic-bezier(.4,0,.2,1);
}
.card:hover .card-glyph { transform: scale(1.12) rotate(-4deg); }

.card--industry   .card-band { background: linear-gradient(135deg, #1d6fa5 0%, #16456b 100%); }
.card--academic   .card-band { background: linear-gradient(135deg, #4a3fb0 0%, #2a2168 100%); }
.card--commercial .card-band { background: linear-gradient(135deg, #c0397e 0%, #e07a3a 100%); }

.card-body {
    padding: 26px 28px 30px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.card-body h2 {
    font-family: var(--font-display);
    font-size: 1.62rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 10px;
}
.card-body p {
    font-size: 0.97rem;
    color: var(--muted);
    line-height: 1.58;
    flex: 1;
}
.card-cta {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.96rem;
    color: var(--green);
    margin-top: 22px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
}
.card-arrow { transition: transform 0.28s ease; }
.card:hover .card-arrow { transform: translateX(5px); }

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
    .cards { grid-template-columns: 1fr; gap: 20px; }
    .card-band { height: 96px; }
}
@media (max-width: 760px) {
    .landing-hero { padding: 50px 0 4px; }
    .landing-hero h1 { font-size: 2.4rem; }
    .cards-section { padding: 30px 0 60px; }
}
@media (max-width: 480px) {
    .landing-hero h1 { font-size: 2rem; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    .card, .card-glyph, .card-arrow { transition: none; }
    .card:hover { transform: none; }
}

/* ---------- Language toggle (shell nav) ---------- */
.lang-toggle {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding-left: 18px;
    margin-left: 4px;
    border-left: 1px solid var(--line);
}
.lang-toggle a { color: var(--muted); transition: color 0.2s; }
.lang-toggle a:hover { color: var(--green); }
.lang-toggle .lang-cur { color: var(--ink); font-weight: 500; }
.lang-toggle .lang-sep { color: #c0cad4; }

body.deep-page .lang-toggle { border-left-color: #1c232e; }
body.deep-page .lang-toggle a { color: #6a7888; }
body.deep-page .lang-toggle a:hover { color: var(--green-bright); }
body.deep-page .lang-toggle .lang-cur { color: #f0f4f8; }

@media (max-width: 480px) {
    .lang-toggle { padding-left: 12px; gap: 4px; }
}