/* Self-hosted fonts (SIL Open Font License 1.1): Inter by Rasmus Andersson, JetBrains Mono by JetBrains. */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-display: swap;
    font-weight: 100 900;
    src: url('../fonts/inter-latin-ext-wght-normal.woff2') format('woff2');
    unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-display: swap;
    font-weight: 100 900;
    src: url('../fonts/inter-latin-wght-normal.woff2') format('woff2');
    unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-display: swap;
    font-weight: 100 800;
    src: url('../fonts/jetbrains-mono-latin-ext-wght-normal.woff2') format('woff2');
    unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-display: swap;
    font-weight: 100 800;
    src: url('../fonts/jetbrains-mono-latin-wght-normal.woff2') format('woff2');
    unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

:root {
    --bg: #f7f7f5;
    --surface: #ffffff;
    --text: #16181d;
    --muted: #5d6370;
    --border: #e4e4e0;
    --accent: #2f5bea;
    --accent-soft: #e8eefe;
    --tag-bg: #f0f0ec;
    --mono: 'JetBrains Mono', ui-monospace, monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --surface: #171a20;
        --text: #e8e9ec;
        --muted: #9aa0ab;
        --border: #262a33;
        --accent: #7c9bff;
        --accent-soft: #1c2440;
        --tag-bg: #21252d;
    }
}

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

html { scroll-padding-top: 72px; }

@media (prefers-reduced-motion: no-preference) {
    html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition: none !important; }
}

[hidden] { display: none !important; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.skip-link {
    position: absolute;
    left: 16px;
    top: -48px;
    z-index: 20;
    padding: 8px 14px;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
}
.skip-link:focus { top: 12px; }

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.icon { width: 1em; height: 1em; fill: currentColor; flex-shrink: 0; vertical-align: -0.125em; }

/* Nav */
.nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--bg);
    background: color-mix(in srgb, var(--bg) 85%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: 1040px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-brand { font-family: var(--mono); font-weight: 500; text-decoration: none; letter-spacing: 0.05em; }
.nav-links { display: flex; gap: 24px; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: 0.9rem; }
.nav-links a:hover { color: var(--text); }

.container { max-width: 1040px; margin: 0 auto; padding: 0 24px; }

/* Hero */
.hero {
    display: flex;
    gap: 40px;
    align-items: center;
    padding: 80px 0 64px;
}
.hero-photo {
    width: 168px;
    height: 168px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    border: 1px solid var(--border);
}
.eyebrow {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}
.hero h1 { font-size: clamp(2rem, 5vw, 2.9rem); line-height: 1.15; letter-spacing: -0.02em; }
.lead { font-size: 1.15rem; color: var(--muted); margin: 16px 0 24px; max-width: 640px; }

.social-links { display: flex; flex-wrap: wrap; gap: 10px; }
.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: border-color 0.15s, color 0.15s;
}
.social-link:hover { border-color: var(--accent); color: var(--accent); }

/* Sections */
.section { padding: 56px 0; border-top: 1px solid var(--border); }
.section-title {
    font-size: 1.5rem;
    letter-spacing: -0.01em;
    margin-bottom: 32px;
    display: flex;
    align-items: baseline;
    gap: 12px;
}
.section-title span { font-family: var(--mono); font-size: 0.85rem; color: var(--accent); font-weight: 400; }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 260px; gap: 48px; }
.about-text p { margin-bottom: 16px; font-size: 1.05rem; }
.stats { list-style: none; display: flex; flex-direction: column; gap: 20px; }
.stats li { border-left: 2px solid var(--accent); padding-left: 16px; }
.stats strong { display: block; font-size: 1.8rem; line-height: 1.1; }
.stats span { color: var(--muted); font-size: 0.9rem; }

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.skill-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
}
.skill-card.accent { border-color: var(--accent); background: linear-gradient(var(--accent-soft), var(--surface) 70%); }
.skill-icon { display: block; color: var(--accent); font-size: 1.2rem; margin-bottom: 12px; }
.skill-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.skill-card p { color: var(--muted); font-size: 0.92rem; margin-bottom: 16px; }

.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; }
.tags li {
    font-size: 0.78rem;
    padding: 3px 9px;
    border-radius: 6px;
    background: var(--tag-bg);
    color: var(--text);
}
.tags.small li { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); }

/* Timeline */
.timeline { list-style: none; }
.timeline li {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 24px;
    padding: 18px 0;
    border-bottom: 1px dashed var(--border);
}
.timeline li:last-child { border-bottom: none; }
.timeline li.hidden { display: none; }
.tl-date { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); padding-top: 3px; }
.tl-body h3 { font-size: 1.02rem; font-weight: 600; }
.tl-body h3 span { font-weight: 400; color: var(--muted); }
.tl-body p { color: var(--muted); font-size: 0.93rem; margin-top: 4px; }
.edu { margin-top: 24px; color: var(--muted); font-size: 0.92rem; }
.edu .icon { color: var(--accent); margin-right: 6px; }

/* Articles */
.articles-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.article-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    text-decoration: none;
    transition: border-color 0.15s, transform 0.15s;
}
.article-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.article-card.hidden { display: none; }
.article-meta { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }
.article-source { color: var(--accent); }
.article-title { font-size: 1rem; font-weight: 600; line-height: 1.4; }
.empty { color: var(--muted); }

.expand-button {
    margin-top: 20px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text);
    font: inherit;
    font-size: 0.9rem;
    cursor: pointer;
}
.expand-button:hover { border-color: var(--accent); }
.expand-button .icon { transition: transform 0.2s; }
.expand-button.expanded .icon { transform: rotate(180deg); }

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 32px 0 48px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--muted);
    font-size: 0.85rem;
}

/* Mobile */
@media (max-width: 760px) {
    .container, .nav-inner { padding-left: 16px; padding-right: 16px; }
    .nav-links { gap: 14px; }
    .nav-links a { font-size: 0.82rem; }
    .hero { flex-direction: column; align-items: flex-start; gap: 24px; padding: 48px 0 40px; }
    .hero-photo { width: 112px; height: 112px; }
    .about-grid { grid-template-columns: 1fr; gap: 24px; }
    .skills-grid, .articles-grid { grid-template-columns: 1fr; }
    .timeline li { grid-template-columns: 1fr; gap: 4px; }
}