:root {
    /* "Raw Architecture" — 60 Crisp Off-White / 30 Structured Ash / 10 Servlet Blue */
    --color-bg: #f8f9fa;
    --color-surface: #eef1f4;
    --color-border: #e1e4e8;
    --color-text: #14171c;
    --color-text-muted: #5b6270;
    --color-accent: #005c97;
    --color-on-accent: #ffffff;
    --space-1: 0.5rem;
    --space-2: 1rem;
    --space-3: 1.5rem;
    --space-4: 2.5rem;
    --max-width: 860px;

    /* Glass surfaces, tuned for a light, near-white backdrop -- plain
       white-on-white translucency barely reads as "glass" here, so the
       panel gets a faint accent tint, a blue-tinted border instead of flat
       gray, and a colored shadow with an inset highlight along the top
       edge (light catching the top of a glass pane). */
    --glass-tint: color-mix(in srgb, #ffffff 96%, var(--color-accent) 4%);
    --glass-bg: color-mix(in srgb, var(--glass-tint) 62%, transparent);
    --glass-card-bg: color-mix(in srgb, var(--glass-tint) 76%, transparent);
    --glass-border: color-mix(in srgb, var(--color-accent) 18%, transparent);
    --glass-shadow: 0 10px 30px rgba(0, 92, 151, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.7);
    --glass-blur: blur(20px) saturate(160%);
    --glass-blur-soft: blur(10px) saturate(140%);
    --ambient-gradient:
        radial-gradient(circle at 12% 8%, color-mix(in srgb, var(--color-accent) 34%, transparent) 0%, transparent 45%),
        radial-gradient(circle at 88% 18%, color-mix(in srgb, var(--color-accent) 22%, transparent) 0%, transparent 48%),
        radial-gradient(circle at 50% 95%, color-mix(in srgb, var(--color-accent) 18%, transparent) 0%, transparent 55%);
}

:root[data-theme="dark"] {
    /* "Terminal Pupil" — 60 Deep Slate / 30 Gunmetal / 10 Codeforces Green */
    --color-bg: #181a1f;
    --color-surface: #2d323b;
    --color-border: #3a4049;
    --color-text: #e7e9ec;
    --color-text-muted: #8b93a1;
    --color-accent: #00a82d;
    --color-on-accent: #0b0d10;

    /* Dark already has enough contrast for plain surface-tinted glass --
       kept as its own explicit values (not inherited from :root above) so
       tuning light mode above doesn't also change how dark looks. */
    --glass-bg: color-mix(in srgb, var(--color-surface) 55%, transparent);
    --glass-card-bg: color-mix(in srgb, var(--color-surface) 70%, transparent);
    --glass-border: color-mix(in srgb, var(--color-text) 12%, transparent);
    --glass-shadow: 0 10px 30px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    --ambient-gradient:
        radial-gradient(circle at 12% 8%, color-mix(in srgb, var(--color-accent) 26%, transparent) 0%, transparent 42%),
        radial-gradient(circle at 88% 18%, color-mix(in srgb, var(--color-accent) 16%, transparent) 0%, transparent 46%),
        radial-gradient(circle at 50% 95%, color-mix(in srgb, var(--color-accent) 14%, transparent) 0%, transparent 50%);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-bg: #181a1f;
        --color-surface: #2d323b;
        --color-border: #3a4049;
        --color-text: #e7e9ec;
        --color-text-muted: #8b93a1;
        --color-accent: #00a82d;
        --color-on-accent: #0b0d10;
        --glass-bg: color-mix(in srgb, var(--color-surface) 55%, transparent);
        --glass-card-bg: color-mix(in srgb, var(--color-surface) 70%, transparent);
        --glass-border: color-mix(in srgb, var(--color-text) 12%, transparent);
        --glass-shadow: 0 10px 30px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.06);
        --ambient-gradient:
            radial-gradient(circle at 12% 8%, color-mix(in srgb, var(--color-accent) 26%, transparent) 0%, transparent 42%),
            radial-gradient(circle at 88% 18%, color-mix(in srgb, var(--color-accent) 16%, transparent) 0%, transparent 46%),
            radial-gradient(circle at 50% 95%, color-mix(in srgb, var(--color-accent) 14%, transparent) 0%, transparent 50%);
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background-color: var(--color-bg);
    /* Ambient blobs tinted from the accent color -- the "something behind
       the glass" that makes the blur on panels/cards actually visible,
       rather than just a flat translucent tint. */
    background-image: var(--ambient-gradient);
    background-attachment: fixed;
    background-repeat: no-repeat;
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    transition: background-color 0.15s ease, color 0.15s ease;
}

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

a:hover {
    text-decoration: underline;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-3);
}

header.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-2) 0;
}

header.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

nav.site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.theme-toggle {
    background: var(--glass-card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--color-text);
    width: 2.2rem;
    height: 2.2rem;
    padding: 0;
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    transition: border-color 0.15s ease, transform 0.15s ease;
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    transform: translateY(-1px);
}

/* Every <section> on the homepage carries .container, and every other
   page's <main> IS its .container -- so this one rule turns each into a
   floating glass panel, on every page, with no template changes. */
section.container,
main.container {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: var(--space-4) var(--space-3);
    margin: var(--space-3) auto;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--glass-shadow);
}

h1, h2, h3 {
    line-height: 1.25;
}

h2.section-title {
    font-size: 1.4rem;
    margin-bottom: var(--space-3);
}

.hero h1 {
    font-size: 2.2rem;
    margin-bottom: var(--space-1);
}

.hero .status {
    display: inline-block;
    color: var(--color-accent);
    margin-bottom: var(--space-2);
}

.cta-group {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    margin-top: var(--space-2);
}

.cta-group a {
    background: var(--glass-card-bg);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    border-radius: 10px;
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.cta-group a:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    text-decoration: none;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-3);
}

.card {
    background: var(--glass-card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: var(--space-3);
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    box-shadow: var(--glass-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-3px);
}

.card h3 {
    margin-top: 0;
}

.meta {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: var(--space-1);
}

.tag {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    padding: 0.2rem 0.65rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
}

.timeline-item {
    margin-bottom: var(--space-3);
}

.timeline-item ul {
    margin-top: var(--space-1);
    padding-left: 1.2rem;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    text-align: left;
    padding: var(--space-1);
    border-bottom: 1px solid var(--color-border);
}

form.stacked {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    max-width: 480px;
}

form.stacked label {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

input, textarea, select {
    background: var(--glass-card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--color-text);
    padding: 0.5rem;
    font-family: inherit;
    font-size: 1rem;
}

textarea {
    min-height: 260px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

button, input[type="submit"] {
    background: var(--color-accent);
    color: var(--color-on-accent);
    border: none;
    border-radius: 10px;
    padding: 0.6rem 1.2rem;
    font-weight: 600;
    cursor: pointer;
    width: fit-content;
    transition: transform 0.15s ease;
}

button:hover, input[type="submit"]:hover {
    transform: translateY(-1px);
}

.actions {
    display: flex;
    gap: var(--space-1);
    flex-wrap: wrap;
}

.actions button, .actions a {
    padding: 0.3rem 0.7rem;
    font-size: 0.85rem;
}

.error-text {
    color: #ff6b6b;
    font-size: 0.85rem;
}

.post-body h1, .post-body h2, .post-body h3 {
    margin-top: var(--space-3);
}

.post-body pre {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: var(--space-2);
    overflow-x: auto;
}

.post-body code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

footer.site-footer {
    padding: var(--space-3) 0;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border-top: 1px solid var(--glass-border);
    margin-top: var(--space-3);
}

@media (prefers-reduced-motion: reduce) {
    .card, .cta-group a, button, input[type="submit"], .theme-toggle {
        transition: none;
    }

    .card:hover, .cta-group a:hover, button:hover, input[type="submit"]:hover, .theme-toggle:hover {
        transform: none;
    }
}

/* Phone: up to 600px */
@media (max-width: 600px) {
    .hero h1 {
        font-size: 1.7rem;
    }

    header.site-header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    nav.site-nav {
        gap: var(--space-2);
        flex-wrap: wrap;
    }

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

    .cta-group {
        flex-direction: column;
        align-items: stretch;
    }

    .cta-group a {
        text-align: center;
    }
}

/* Tablet: 601px to 900px */
@media (min-width: 601px) and (max-width: 900px) {
    :root {
        --max-width: 700px;
    }

    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop: 901px and up */
@media (min-width: 901px) {
    :root {
        --max-width: 960px;
    }

    .hero h1 {
        font-size: 2.6rem;
    }
}

/* The résumé page's inline PDF. Tall enough to read a page of it without
   scrolling the viewer itself, and it collapses to the download fallback on
   the phones whose browsers won't render a PDF in an <object> at all. */
.cv-preview {
    display: block;
    width: 100%;
    height: min(80vh, 1000px);
    margin-top: var(--space-3);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    background: var(--glass-card-bg);
    box-shadow: var(--glass-shadow);
}

@media (max-width: 640px) {
    .cv-preview {
        height: 60vh;
    }
}