/* ── reset ── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

/* ── theme ── */
:root {
    --fg: #0a0a0a;
    --fg-muted: #5a5a5a;
    --fg-faint: #9a9a9a;
    --border: #e0e0e0;
    --bg: #ffffff;
    --mono: "JetBrains Mono", "SF Mono", "Fira Code", "Cascadia Code", "Lucida Console", monospace;
}

:root[data-theme="dark"] {
    --fg: #e8e8e8;
    --fg-muted: #a0a0a0;
    --fg-faint: #6a6a6a;
    --border: #2c2c2c;
    --bg: #111111;
}

/* ── base ── */
body {
    margin: 0 auto;
    max-width: 40rem;
    padding: clamp(3rem, 8vw, 5rem) clamp(1.5rem, 5vw, 2.5rem);
    font: 400 15px/1.7 var(--mono);
    color: var(--fg);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── typography ── */
h1 {
    font-weight: 700;
    font-size: clamp(1.5rem, 4vw, 1.85rem);
    line-height: 1.15;
    letter-spacing: -0.035em;
    margin: 0 0 0.35em;
}

.tagline {
    font-size: 0.88em;
    color: var(--fg-muted);
    margin: 0 0 3.5em;
    line-height: 1.55;
}

section { margin-bottom: 3em; }

h2 {
    font-weight: 400;
    font-size: 0.78em;
    color: var(--fg-faint);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin: 0 0 1em;
}

/* ── links ── */
a {
    color: var(--fg);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    text-decoration-color: var(--fg-faint);
}

a:hover { text-decoration-color: var(--fg); }

/* ── project list (expandable) ── */
.project-item {
    border-top: 1px solid var(--border);
    padding: 0.7em 0;
}

.project-item:last-child {
    border-bottom: 1px solid var(--border);
}

.project-item summary {
    cursor: pointer;
    list-style: none;
    padding: 0.2em 0;
}

.project-item summary::-webkit-details-marker { display: none; }

.project-item summary::before {
    content: "+";
    display: inline-block;
    width: 1.4em;
    color: var(--fg-faint);
}

.project-item[open] summary::before { content: "−"; }

.project-item summary:hover::before { color: var(--fg); }

.project-name { font-weight: 500; }

.desc {
    display: block;
    color: var(--fg-muted);
    font-size: 0.85em;
    margin-top: 0.25em;
    padding-left: 1.4em;
    line-height: 1.55;
}

.project-detail {
    padding: 0.6em 0 0.4em 1.4em;
    border-left: 2px solid var(--border);
    margin: 0.5em 0 0.2em 0.5em;
}

.project-detail p {
    color: var(--fg-muted);
    font-size: 0.84em;
    line-height: 1.65;
    margin: 0 0 0.6em;
}

.repo-link {
    font-size: 0.78em;
    color: var(--fg-muted);
}

.more-link {
    display: inline-block;
    margin-top: 0.9em;
    font-size: 0.78em;
    color: var(--fg-muted);
}

/* ── publications ── */
.pub {
    margin-bottom: 1em;
    font-size: 0.88em;
}

.pub-venue {
    color: var(--fg-faint);
    font-size: 0.88em;
}

.pub a { font-size: 0.88em; }

/* ── connect links ── */
.links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3em 1.4em;
    font-size: 0.88em;
}

/* ── footer ── */
footer {
    margin-top: 4rem;
    padding-top: 1.2rem;
    border-top: 1px solid var(--border);
    color: var(--fg-faint);
    font-size: 0.72em;
}

/* ── theme toggle ── */
.theme-toggle {
    position: absolute;
    top: 1.2rem;
    right: 1.5rem;
    font: inherit;
    font-size: 0.78em;
    background: none;
    border: none;
    padding: 0.2em 0.4em;
    cursor: pointer;
    color: var(--fg-faint);
}

.theme-toggle:hover { color: var(--fg); }

.theme-toggle::before { content: "[ "; }
.theme-toggle::after { content: " ]"; }

:root[data-theme="dark"] .theme-toggle .to-dark { display: none; }
:root:not([data-theme="dark"]) .theme-toggle .to-light { display: none; }

/* ── selection ── */
::selection {
    background: var(--fg);
    color: var(--bg);
}

/* ── projects page ── */
.back-link {
    margin-bottom: 2.5em;
}

.back-link a {
    font-size: 0.82em;
    color: var(--fg-faint);
}

.back-link a:hover { color: var(--fg); }

header aside {
    color: var(--fg-muted);
    font-size: 0.84em;
    margin-top: 0.3em;
}

.project {
    margin-bottom: 1.5em;
    padding: 0.8em 0;
    border-bottom: 1px solid var(--border);
}

.project:last-of-type {
    border-bottom: none;
}

.project-title a {
    font-weight: 700;
}

.project-org {
    font-size: 0.76em;
    color: var(--fg-faint);
    margin-top: 0.15em;
}

.project-description {
    color: var(--fg-muted);
    font-size: 0.84em;
    margin-top: 0.45em;
    line-height: 1.6;
}

.project-links {
    margin-top: 0.5em;
}

.project-links a {
    font-size: 0.78em;
    margin-right: 1.2em;
}

hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2.5em 0;
}

ul {
    padding-left: 1.2em;
}

li {
    margin-bottom: 0.4em;
    font-size: 0.88em;
}