/* ============================================================
   KAIWEN LI — PORTFOLIO DESIGN SYSTEM
   Cinematic dark canvas · aurora ambience · editorial type
   ============================================================ */

:root {
    /* ============================================================
       LIGHT "PAPER" — the default. Monochrome ink on warm paper;
       colour only appears through motion/interaction (see JS).
       ============================================================ */
    --bg: #f2efe6;
    --bg-soft: #e8e4d8;
    --ink: #17150f;
    --sub: #6d685d;
    --faint: #a39e90;
    --line: rgba(23, 21, 15, 0.14);
    --line-strong: rgba(23, 21, 15, 0.30);
    --glass: rgba(242, 239, 230, 0.62);
    --glass-strong: rgba(242, 239, 230, 0.88);
    --overlay-bg: rgba(242, 239, 230, 0.95);
    --card: rgba(23, 21, 15, 0.022);

    /* base colour for interaction overlays: ink on paper */
    --tint-rgb: 23, 21, 15;
    /* the signature hue that motion/hover reveals */
    --accent: #c6402a;
    --accent-rgb: 198, 64, 42;
    --glow-blend: multiply;

    /* former accent tokens — kept as names so every component recolours at once */
    --a-violet: #17150f;
    --a-cyan: #4a463b;
    --a-ice: #343027;
    --a-steel: #a39e90;

    --grad-text: linear-gradient(180deg, #17150f 0%, #4a463b 100%);
    --grad-line: linear-gradient(90deg, rgba(23, 21, 15, 0.55), rgba(23, 21, 15, 0.08));
    --grad-shine: linear-gradient(110deg, #17150f 18%, #8a8578 40%, #17150f 50%, #8a8578 60%, #17150f 82%);

    --font-display: 'Space Grotesk', -apple-system, system-ui, sans-serif;
    --font-serif: 'Instrument Serif', Georgia, serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --font-body: 'Inter', -apple-system, system-ui, sans-serif;

    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

:root[data-theme="dark"] {
    /* ---- DARK monochrome (the alternate; toggle bottom-left) ---- */
    --bg: #0a0a0a;
    --bg-soft: #131313;
    --ink: #f2f0ea;
    --sub: #98968f;
    --faint: #605e58;
    --line: rgba(242, 240, 234, 0.10);
    --line-strong: rgba(242, 240, 234, 0.22);
    --glass: rgba(16, 16, 16, 0.6);
    --glass-strong: rgba(10, 10, 10, 0.82);
    --overlay-bg: rgba(8, 8, 8, 0.94);
    --card: rgba(242, 240, 234, 0.022);

    --tint-rgb: 255, 255, 255;
    --accent: #ff5a3c;
    --accent-rgb: 255, 90, 60;
    --glow-blend: screen;

    --a-violet: #f2f0ea;
    --a-cyan: #c8c6bf;
    --a-ice: #d8d6cf;
    --a-steel: #605e58;

    --grad-text: linear-gradient(180deg, #f6f4ee 0%, #cfcdc6 100%);
    --grad-line: linear-gradient(90deg, rgba(242, 240, 234, 0.85), rgba(242, 240, 234, 0.12));
    --grad-shine: linear-gradient(110deg, #f2f0ea 18%, #ffffff 40%, #b8b6af 50%, #ffffff 60%, #f2f0ea 82%);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 1.05rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

/* ------------------------------------------------------------
   AMBIENT BACKGROUND — aurora orbs + grid + noise
   ------------------------------------------------------------ */

.ambient {
    position: fixed;
    inset: 0;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(130px);
    opacity: 0.3;
    will-change: transform;
}

.orb-violet {
    width: 55vw;
    height: 55vw;
    top: -18vw;
    left: -12vw;
    background: radial-gradient(circle at 40% 40%, rgba(var(--tint-rgb), 0.05), transparent 62%);
    animation: drift-a 26s ease-in-out infinite alternate;
}

.orb-cyan {
    width: 44vw;
    height: 44vw;
    top: 30vh;
    right: -16vw;
    background: radial-gradient(circle at 55% 45%, rgba(var(--tint-rgb), 0.04), transparent 62%);
    animation: drift-b 32s ease-in-out infinite alternate;
}

.orb-pink {
    width: 40vw;
    height: 40vw;
    bottom: -18vw;
    left: 22vw;
    background: radial-gradient(circle at 50% 50%, rgba(var(--tint-rgb), 0.03), transparent 62%);
    animation: drift-c 38s ease-in-out infinite alternate;
}

.orb-amber {
    width: 26vw;
    height: 26vw;
    top: 58vh;
    left: -8vw;
    background: radial-gradient(circle at 50% 50%, rgba(var(--tint-rgb), 0.022), transparent 62%);
    animation: drift-b 44s ease-in-out infinite alternate-reverse;
}

/* Interactive constellation layer (drawn by site.js) */
.ambient canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

@keyframes drift-a {
    from { transform: translate3d(0, 0, 0) scale(1); }
    to { transform: translate3d(6vw, 8vh, 0) scale(1.15); }
}

@keyframes drift-b {
    from { transform: translate3d(0, 0, 0) scale(1.05); }
    to { transform: translate3d(-7vw, -6vh, 0) scale(0.92); }
}

@keyframes drift-c {
    from { transform: translate3d(0, 0, 0) scale(0.95); }
    to { transform: translate3d(5vw, -9vh, 0) scale(1.1); }
}

.grid-overlay {
    position: absolute;
    inset: -2px;
    background-image:
        linear-gradient(rgba(var(--tint-rgb), 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(var(--tint-rgb), 0.03) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: radial-gradient(ellipse 90% 70% at 50% 20%, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 20%, black 30%, transparent 75%);
}

.noise {
    position: absolute;
    inset: 0;
    opacity: 0.5;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Cursor glow follower */
#cursor-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 620px;
    height: 620px;
    margin: -310px 0 0 -310px;
    border-radius: 50%;
    background: transparent;                 /* colour set by site.js from motion energy */
    mix-blend-mode: var(--glow-blend);
    pointer-events: none;
    z-index: -1;
    will-change: transform, background;
}

/* ------------------------------------------------------------
   NAVIGATION — floating glass pill
   ------------------------------------------------------------ */

.site-nav {
    position: fixed;
    top: 18px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 1.4rem;
    padding: 0.55rem 0.9rem 0.55rem 1.2rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--glass);
    backdrop-filter: blur(22px) saturate(1.5);
    -webkit-backdrop-filter: blur(22px) saturate(1.5);
    transition: background 0.4s, border-color 0.4s, box-shadow 0.4s;
    white-space: nowrap;
}

.site-nav.scrolled {
    background: var(--glass-strong);
    border-color: var(--line-strong);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
}

.nav-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
    text-decoration: none;
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.15rem;
}

.nav-links a {
    position: relative;
    color: var(--sub);
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: color 0.25s;
    padding: 0.3rem 0;
}

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

.nav-links a.active {
    color: var(--ink);
}

.nav-links a.active::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -4px;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--grad-line);
}

.nav-links a.ext::after {
    content: "↗";
    position: static;
    display: inline;
    width: auto;
    height: auto;
    background: none;
    color: var(--faint);
    font-size: 0.7em;
    margin-left: 3px;
    transform: none;
}

.menu-btn {
    display: none;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.35rem 0.5rem;
}

.menu-btn .bars {
    display: inline-flex;
    flex-direction: column;
    gap: 4px;
}

.menu-btn .bars span {
    display: block;
    width: 18px;
    height: 1.5px;
    background: var(--ink);
    transition: transform 0.3s var(--ease-out), opacity 0.3s;
}

@media (max-width: 1020px) {
    .nav-links {
        display: none;
    }

    .menu-btn {
        display: inline-flex;
    }
}

/* Full-screen overlay menu */
.overlay-menu {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: var(--overlay-bg);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 6vh 8vw;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.45s var(--ease-out), visibility 0.45s;
}

.overlay-menu.open {
    opacity: 1;
    visibility: visible;
}

.overlay-menu a {
    display: flex;
    align-items: baseline;
    gap: 1.2rem;
    text-decoration: none;
    color: var(--ink);
    font-family: var(--font-display);
    font-size: clamp(1.7rem, 5.5vw, 3.2rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    padding: 0.35rem 0;
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out), color 0.25s;
}

.overlay-menu.open a {
    opacity: 1;
    transform: translateY(0);
}

.overlay-menu a:hover {
    color: transparent;
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
}

.overlay-menu a .idx {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--faint);
    -webkit-text-fill-color: var(--faint);
}

.overlay-close {
    position: absolute;
    top: 26px;
    right: 30px;
    background: none;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    padding: 0.6rem 1.2rem;
    cursor: pointer;
    transition: border-color 0.25s, background 0.25s;
}

.overlay-close:hover {
    border-color: var(--ink);
    background: rgba(var(--tint-rgb), 0.06);
}

/* ------------------------------------------------------------
   PAGE SCAFFOLD
   ------------------------------------------------------------ */

.page {
    max-width: 1060px;
    margin: 0 auto;
    padding: 170px 40px 60px;
}

.kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--sub);
    margin-bottom: 1.4rem;
}

.kicker::before {
    content: "";
    width: 26px;
    height: 1px;
    background: var(--grad-line);
}

.display {
    font-family: var(--font-display);
    font-size: clamp(2.6rem, 7vw, 4.6rem);
    font-weight: 700;
    letter-spacing: -0.035em;
    line-height: 1.02;
    margin: 0 0 1.2rem;
    color: var(--ink);
}

.display em,
.serif-accent {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 400;
    letter-spacing: -0.01em;
    padding-right: 0.06em;
    /* solid fallback first — if background-clip:text fails to (re)apply
       during a repaint (GPU compositing edge case on transform/opacity
       transitions), the word stays ink-colored instead of vanishing */
    color: var(--ink);
}

@supports (background-clip: text) or (-webkit-background-clip: text) {
    .display em,
    .serif-accent {
        background: var(--grad-text);
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
        color: transparent;
    }
}

.lede {
    color: var(--sub);
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    max-width: 640px;
    line-height: 1.7;
    margin: 0 0 3rem;
}

.section-gap {
    margin-top: 5.5rem;
}

/* ------------------------------------------------------------
   CURSOR-REACTIVE TYPE — letters/words split by site.js
   ------------------------------------------------------------ */

.ch,
.ch-unit {
    display: inline-block;
    will-change: transform;
}

/* inline-block spans lose the parent's letter-spacing between
   characters — compensate so headline tracking stays tight */
.hero-name .ch {
    margin-right: -0.045em;
}

.display .ch {
    margin-right: -0.035em;
}

.section-title .ch {
    margin-right: -0.03em;
}

/* ------------------------------------------------------------
   REVEAL ON SCROLL
   ------------------------------------------------------------ */

[data-reveal] {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
    transition-delay: var(--d, 0s);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ------------------------------------------------------------
   GLASS CARDS (pointer-tracked glow)
   ------------------------------------------------------------ */

.glass-card {
    position: relative;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 1.8rem;
    overflow: hidden;
    transition: border-color 0.35s, transform 0.35s var(--ease-out), box-shadow 0.35s;
}

.glass-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(480px circle at var(--mx, 50%) var(--my, 50%),
            rgba(var(--accent-rgb), 0.13), transparent 55%);
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
}

.glass-card:hover {
    border-color: var(--line-strong);
    transform: translateY(-3px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.glass-card:hover::before {
    opacity: 1;
}

.card-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 0.9rem;
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.015em;
    color: var(--ink);
    margin: 0 0 0.5rem;
}

.card-desc {
    color: var(--sub);
    font-size: 0.94rem;
    line-height: 1.65;
    margin: 0;
}

.card-desc strong {
    color: var(--ink);
    font-weight: 600;
}

/* Bento grid */
.bento {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 18px;
}

.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }

@media (max-width: 800px) {
    .span-2, .span-3, .span-4, .span-6 {
        grid-column: span 6;
    }
}

/* ------------------------------------------------------------
   CHIPS / TAGS
   ------------------------------------------------------------ */

.chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    padding: 0;
    margin: 1rem 0 0;
    list-style: none;
}

.chip {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--sub);
    border: 1px solid var(--line);
    background: rgba(var(--tint-rgb), 0.03);
    border-radius: 999px;
    padding: 6px 14px;
    transition: color 0.25s, border-color 0.25s, background 0.25s, transform 0.25s;
}

.chip:hover {
    color: var(--ink);
    border-color: var(--line-strong);
    background: rgba(var(--tint-rgb), 0.06);
    transform: translateY(-2px);
}

.tag-solo {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--ink);
    border: 1px solid var(--line-strong);
    background: rgba(var(--tint-rgb), 0.05);
    border-radius: 999px;
    padding: 5px 13px;
    margin-top: 1.2rem;
}

/* ------------------------------------------------------------
   TIMELINE
   ------------------------------------------------------------ */

.timeline {
    position: relative;
    padding-left: 2.4rem;
    margin-left: 0.4rem;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, var(--a-violet), var(--a-cyan) 55%, transparent);
    opacity: 0.5;
}

.t-entry {
    position: relative;
    margin-bottom: 4rem;
}

.t-entry::before {
    content: "";
    position: absolute;
    left: calc(-2.4rem - 5.5px - 0.4px);
    top: 9px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--bg);
    border: 1.5px solid var(--ink);
    box-shadow: none;
}

.t-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.t-title {
    font-family: var(--font-display);
    font-size: 1.55rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin: 0;
}

.t-date {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--faint);
    letter-spacing: 0.05em;
}

.t-org {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-top: 5px;
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.t-points {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
}

.t-points li {
    position: relative;
    padding-left: 1.6rem;
    color: var(--sub);
    font-size: 0.96rem;
    margin-bottom: 0.55rem;
    line-height: 1.65;
}

.t-points li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--a-cyan);
    font-family: var(--font-mono);
}

/* ------------------------------------------------------------
   BUTTONS
   ------------------------------------------------------------ */

.btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-family: var(--font-display);
    font-size: 0.92rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    text-decoration: none;
    border-radius: 999px;
    padding: 0.85rem 1.7rem;
    transition: transform 0.3s var(--ease-out), box-shadow 0.3s, background 0.3s, border-color 0.3s;
    will-change: transform;
}

.btn-primary {
    color: var(--bg);
    background: var(--ink);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
}

.btn-primary:hover {
    box-shadow: 0 16px 44px rgba(0, 0, 0, 0.4);
}

.btn-ghost {
    color: var(--ink);
    border: 1px solid var(--line-strong);
    background: rgba(var(--tint-rgb), 0.03);
}

.btn-ghost:hover {
    border-color: var(--ink);
    background: rgba(var(--tint-rgb), 0.05);
}

.btn .arrow {
    transition: transform 0.3s var(--ease-out);
}

.btn:hover .arrow {
    transform: translateX(4px);
}

/* ------------------------------------------------------------
   ARTICLE (project pages)
   ------------------------------------------------------------ */

.article {
    max-width: 760px;
}

.article h2 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin: 3rem 0 1rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.article h2::before {
    content: "";
    width: 18px;
    height: 1px;
    background: var(--grad-line);
    flex-shrink: 0;
}

.article p {
    color: var(--sub);
    margin: 0 0 1.1rem;
}

.article p strong,
.article li strong {
    color: var(--ink);
    font-weight: 600;
}

.article ul,
.article ol {
    color: var(--sub);
    padding-left: 1.4rem;
    margin: 0 0 1.2rem;
}

.article li {
    margin-bottom: 0.6rem;
}

.article li::marker {
    color: var(--a-violet);
}

.article a:not(.btn) {
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--line-strong);
    transition: border-color 0.25s;
}

.article a:not(.btn):hover {
    border-color: var(--ink);
}

code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    color: var(--ink);
    background: rgba(var(--tint-rgb), 0.06);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0.1em 0.45em;
}

.code-block {
    position: relative;
    background: rgba(3, 3, 6, 0.8);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 1.3rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.7;
    color: #c9d1d9;
    overflow-x: auto;
    margin: 1rem 0 1.4rem;
    white-space: pre-wrap;
}

.code-block::before {
    content: "";
    position: absolute;
    top: 0;
    left: 1.5rem;
    right: 1.5rem;
    height: 1px;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.35), transparent);
    opacity: 0.5;
}

.code-block .kw { color: #f2f0ea; font-weight: 500; }
.code-block .str { color: #b4b2ab; }
.code-block .cm { color: #63615b; font-style: italic; }

/* ------------------------------------------------------------
   STATS STRIP
   ------------------------------------------------------------ */

.stat-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 18px;
}

.stat {
    border-left: 1px solid var(--line-strong);
    padding-left: 1.2rem;
}

.stat .num {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.1;
}

.stat .lbl {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--faint);
    margin-top: 0.4rem;
}

/* ------------------------------------------------------------
   FOOTER
   ------------------------------------------------------------ */

.site-footer {
    max-width: 1060px;
    margin: 6rem auto 0;
    padding: 2.5rem 40px 3rem;
    border-top: 1px solid var(--line);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-footer .foot-name {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ink);
}

.site-footer .foot-meta {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--faint);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.4rem;
}

.site-footer a {
    color: var(--sub);
    text-decoration: none;
    transition: color 0.25s;
}

.site-footer a:hover {
    color: var(--ink);
}

/* ------------------------------------------------------------
   HERO (index)
   ------------------------------------------------------------ */

.hero {
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 24px 80px;
    position: relative;
}

.hero-inner {
    will-change: transform;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--sub);
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    padding: 0.55rem 1.2rem;
    background: rgba(var(--tint-rgb), 0.03);
    backdrop-filter: blur(10px);
    margin-bottom: 2.6rem;
    animation: rise 1s var(--ease-out) 0.15s both;
}

.status-pill .dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.6);
    animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.35; }
}

/* Hero terminal prompt — replaces the status pill on the home page */
.hero-prompt {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.01em;
    color: var(--sub);
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    padding: 0.55rem 1.1rem;
    background: rgba(var(--tint-rgb), 0.03);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    margin-bottom: 2.6rem;
    animation: rise 1s var(--ease-out) 0.15s both;
    transition: color 0.25s, border-color 0.25s, transform 0.25s var(--ease-out);
}

.hero-prompt:hover {
    color: var(--ink);
    border-color: var(--ink);
    transform: translateY(-2px);
}

.hero-prompt .hp-caret {
    color: var(--accent);
    font-weight: 500;
}

.hero-prompt .hp-path { color: var(--ink); }
.hero-prompt .hp-sep { color: var(--faint); }
.hero-prompt .hp-hint b { color: var(--ink); font-weight: 600; }

.hero-prompt .hp-key {
    font-family: var(--font-mono);
    font-size: 0.66rem;
    color: var(--faint);
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 1px 6px;
    margin-left: 0.1rem;
}

.hero-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(3.4rem, 12vw, 8.6rem);
    letter-spacing: -0.045em;
    line-height: 0.98;
    margin: 0;
    color: var(--ink);
}

.hero-name .line {
    display: block;
    overflow: hidden;
    padding-bottom: 0.08em;
    margin-bottom: -0.08em;
}

.hero-name .line > span {
    display: inline-block;
    transform: translateY(115%);
    animation: rise-in 1.1s var(--ease-out) forwards;
}

.hero-name .line:nth-child(2) > span {
    animation-delay: 0.12s;
}

.hero-name .shine {
    background: var(--grad-shine);
    background-size: 220% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: shimmer 7s linear 1.4s infinite;
}

@keyframes rise-in {
    to { transform: translateY(0); }
}

@keyframes shimmer {
    0% { background-position: 120% 0; }
    100% { background-position: -120% 0; }
}

@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(22px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hero signature name + rotating identity headline (home page) */
.hero-signature {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--sub);
    margin: 0 0 1.4rem;
    padding-left: 0.36em; /* optical balance for the tracking */
    animation: rise 1s var(--ease-out) 0.15s both;
}

.hero-headline {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.3rem, 7vw, 5rem);
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin: 0;
    color: var(--ink);
    min-height: 2.2em; /* reserve room so the CTA below never jumps as text types */
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    animation: rise 1s var(--ease-out) 0.3s both;
}

.hero-headline .hl-lead { color: var(--sub); }
.hero-headline .hl-type { color: var(--ink); }
.hero-headline .hl-caret {
    color: var(--accent);
    font-weight: 400;
    margin-left: 0.02em;
    animation: caret-blink 1.05s steps(1) infinite;
}

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

.hero-tag {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(1.25rem, 3vw, 1.9rem);
    color: var(--sub);
    margin: 1.8rem 0 0;
    animation: rise 1s var(--ease-out) 0.5s both;
}

.hero-tag .hl {
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-contact {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.05em;
    color: var(--faint);
    margin-top: 1.4rem;
    animation: rise 1s var(--ease-out) 0.65s both;
}

.hero-cta {
    margin-top: 3rem;
    animation: rise 1s var(--ease-out) 0.8s both;
}

.scroll-cue {
    position: absolute;
    bottom: 34px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--faint);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.7rem;
    animation: rise 1s var(--ease-out) 1.1s both;
}

.scroll-cue::after {
    content: "";
    width: 1px;
    height: 44px;
    background: linear-gradient(180deg, var(--a-violet), transparent);
    animation: cue-drop 2s var(--ease-out) infinite;
}

@keyframes cue-drop {
    0% { transform: scaleY(0); transform-origin: top; }
    45% { transform: scaleY(1); transform-origin: top; }
    55% { transform: scaleY(1); transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* Hero background typography */
.hero-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(12rem, 34vw, 26rem);
    letter-spacing: -0.05em;
    color: transparent;
    -webkit-text-stroke: 1px rgba(var(--tint-rgb), 0.05);
    pointer-events: none;
    user-select: none;
    white-space: nowrap;
    will-change: transform;
    z-index: -1;
}

/* ------------------------------------------------------------
   ABOUT SECTION (index)
   ------------------------------------------------------------ */

.about-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3.5rem;
    align-items: start;
}

@media (max-width: 800px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
}

.portrait-frame {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--line-strong);
    aspect-ratio: 4 / 5;
    will-change: transform;
}

.portrait-frame::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(200deg, rgba(var(--tint-rgb), 0.05), transparent 45%);
    pointer-events: none;
    z-index: 1;
}

.portrait-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    filter: contrast(1.02);
}

/* Home faculty-style bio listing */
.about-bio {
    max-width: 540px;
}

.about-bio .bio-name {
    display: block;
    font-family: var(--font-display);
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ink);
}

.bio-role {
    margin: 0.5rem 0 0;
    color: var(--sub);
    font-size: 1rem;
    line-height: 1.6;
}

.bio-affil {
    margin: 1.5rem 0 0;
    color: var(--sub);
    font-size: 1rem;
    line-height: 1.8;
}

.about-bio a {
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--line-strong);
    transition: color 0.25s, border-color 0.25s;
}

.about-bio a:hover {
    border-color: var(--ink);
}

.about-bio .mark {
    color: var(--ink);
    font-weight: 600;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 1px;
}

.about-bio a.mark-link {
    font-weight: 600;
    border-bottom: 2px solid var(--accent);
}

.about-bio a.mark-link:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.bio-sep {
    color: var(--faint);
    margin: 0 0.55rem;
}

.about-bio .mini-label {
    display: block;
    margin: 1.8rem 0 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--faint);
}

.bio-contact {
    margin: 0;
    color: var(--sub);
    font-size: 0.96rem;
    line-height: 1.75;
}

.bio-social {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1.3rem;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink);
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    padding: 0.45rem 1.15rem 0.45rem 0.5rem;
    text-decoration: none;
    background: rgba(var(--tint-rgb), 0.03);
    transition: background 0.25s, border-color 0.25s, transform 0.25s var(--ease-out), color 0.25s;
}

.social-btn .social-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--ink);
    color: var(--bg);
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 700;
    transition: background 0.25s, color 0.25s;
}

.social-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.social-btn:hover .social-ico {
    background: var(--accent);
    color: #fff;
}

/* compact the stats when they sit in the About bio column */
.about-bio .stat-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem 1.6rem;
}

.about-bio .stat {
    padding-left: 0.85rem;
}

.about-bio .stat .num {
    font-size: 1.05rem;
    line-height: 1.2;
}

.about-bio .stat .lbl {
    font-size: 0.6rem;
    letter-spacing: 0.12em;
    margin-top: 0.2rem;
}

/* Big marquee-ish section title used across pages */
.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.9rem, 4.5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: 0 0 2.2rem;
    color: var(--ink);
}

/* Project feature cards on index */
.project-card {
    display: block;
    text-decoration: none;
    padding: 2.2rem;
    border-radius: 24px;
}

.project-card .proj-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--faint);
    letter-spacing: 0.2em;
}

.project-card .proj-name {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 3.4vw, 2.3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--ink);
    margin: 0.7rem 0 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.project-card .proj-name .go {
    font-size: 0.6em;
    color: var(--faint);
    transition: transform 0.35s var(--ease-out), color 0.35s;
}

.project-card:hover .proj-name .go {
    transform: translate(6px, -6px);
    color: var(--a-cyan);
}

.project-card .proj-desc {
    color: var(--sub);
    font-size: 0.97rem;
    line-height: 1.7;
    margin: 0;
    max-width: 560px;
}

/* Language rows */
.lang-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.6rem 0;
    border-bottom: 1px dashed var(--line);
}

.lang-row:last-child {
    border-bottom: none;
}

.lang-row .lang {
    color: var(--ink);
    font-weight: 500;
    font-size: 0.95rem;
}

.lang-row .level {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--faint);
    letter-spacing: 0.08em;
}

/* ------------------------------------------------------------
   RESPONSIVE / MOTION
   ------------------------------------------------------------ */

@media (max-width: 700px) {
    .page {
        padding: 140px 22px 40px;
    }

    .site-footer {
        padding: 2rem 22px 2.5rem;
    }

    .site-nav {
        top: 12px;
        max-width: calc(100vw - 24px);
    }
}

/* ============================================================
   SIGNATURE LAYER — tesseract · game of life · terminal
   ============================================================ */

.hero-inner {
    position: relative;
    z-index: 1;
}

#tesseract {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* --- Globe overlay (terminal: globe) --- */
.globe-canvas {
    position: fixed;
    inset: 0;
    z-index: 90;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s var(--ease-out);
}

/* --- Terminal launcher --- */
.term-launcher {
    position: fixed;
    right: 22px;
    bottom: 22px;
    z-index: 150;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.08em;
    color: var(--sub);
    background: var(--glass);
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    padding: 0.55rem 1.05rem;
    cursor: pointer;
    backdrop-filter: blur(18px) saturate(1.4);
    -webkit-backdrop-filter: blur(18px) saturate(1.4);
    transition: color 0.25s, border-color 0.25s, transform 0.25s var(--ease-out), box-shadow 0.25s;
}

.term-launcher:hover {
    color: var(--ink);
    border-color: var(--ink);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    transform: translateY(-2px);
}

.term-launcher .tl-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 8px rgba(var(--accent-rgb), 0.55);
}

.term-launcher kbd {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--faint);
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 1px 6px;
    margin-left: 2px;
}

/* --- Terminal window --- */
.terminal {
    position: fixed;
    right: 22px;
    bottom: 76px;
    z-index: 180;
    width: min(580px, calc(100vw - 32px));
    height: min(440px, 62vh);
    display: flex;
    flex-direction: column;
    background: rgba(8, 8, 13, 0.9);
    border: 1px solid var(--line-strong);
    border-radius: 16px;
    overflow: hidden;
    backdrop-filter: blur(26px) saturate(1.4);
    -webkit-backdrop-filter: blur(26px) saturate(1.4);
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.6);
    opacity: 0;
    transform: translateY(16px) scale(0.98);
    visibility: hidden;
    transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out), visibility 0.3s;
}

.terminal.open {
    opacity: 1;
    transform: none;
    visibility: visible;
}

.term-bar {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.6rem 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.02);
    flex-shrink: 0;
}

.term-dots {
    display: inline-flex;
    gap: 6px;
}

.term-dots i {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.term-dots i:nth-child(1) { background: rgba(242, 240, 234, 0.5); }
.term-dots i:nth-child(2) { background: rgba(242, 240, 234, 0.3); }
.term-dots i:nth-child(3) { background: rgba(242, 240, 234, 0.18); }

.term-title {
    flex: 1;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: #8a877f;
}

.term-close {
    background: none;
    border: none;
    color: #8a877f;
    cursor: pointer;
    font-size: 0.85rem;
    padding: 2px 6px;
    transition: color 0.2s;
}

.term-close:hover {
    color: #f0eee8;
}

.term-out {
    flex: 1;
    overflow-y: auto;
    padding: 0.9rem 1.1rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.55;
    color: #c9d1d9;
}

.term-out::-webkit-scrollbar {
    width: 8px;
}

.term-out::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 4px;
}

.tline {
    white-space: pre-wrap;
    word-break: break-word;
    margin: 0 0 2px;
    animation: tfade 0.18s ease-out;
}

@keyframes tfade {
    from { opacity: 0; transform: translateY(3px); }
    to { opacity: 1; }
}

.tline .t-ps {
    color: #c8c6bf;
    margin-right: 0.5ch;
}

.tline.t-cmd { color: #f0eee8; }
.tline.t-dim { color: #7a776f; }
.tline.t-acc { color: #d8d6cf; }
.tline.t-cy { color: #f6f4ee; }
.tline.t-err { color: #98968f; font-style: italic; }

.tline.t-banner {
    font-size: 0.58rem;
    line-height: 1.25;
    color: #d8d6cf;
}

.term-line {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.65rem 1.1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
}

.term-prompt {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #c8c6bf;
}

.term-in {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: #e8e6e0;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    caret-color: #e8e6e0;
}

/* --- Toast --- */
.kl-toast {
    position: fixed;
    top: 84px;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    z-index: 220;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.1em;
    color: #f0eee8;
    background: rgba(10, 10, 10, 0.88);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 999px;
    padding: 0.6rem 1.2rem;
    opacity: 0;
    pointer-events: none;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: opacity 0.35s, transform 0.35s var(--ease-out);
}

.kl-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* --- Theme toggle (paper ⇄ dark), injected by site.js --- */
.theme-toggle {
    position: fixed;
    left: 22px;
    bottom: 22px;
    z-index: 150;
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    line-height: 1;
    color: var(--sub);
    background: var(--glass);
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    cursor: pointer;
    backdrop-filter: blur(18px) saturate(1.2);
    -webkit-backdrop-filter: blur(18px) saturate(1.2);
    transition: color 0.25s, border-color 0.25s, transform 0.3s var(--ease-out);
}

.theme-toggle:hover {
    color: var(--ink);
    border-color: var(--ink);
    transform: translateY(-2px) rotate(-12deg);
}

@media (max-width: 600px) {
    .term-launcher {
        right: 16px;
        bottom: 16px;
    }

    .term-launcher kbd {
        display: none;
    }

    .terminal {
        right: 16px;
        bottom: 68px;
        height: 55vh;
    }

    .theme-toggle {
        left: 16px;
        bottom: 16px;
    }
}