:root {
    --color-bg: #f4f8fa;
    --color-surface: #ffffff;
    --color-border: #d8e2ea;
    --color-text: #0f172a;
    --color-muted: #475569;
    --color-accent: #0d9488;
    --color-accent-dim: #0f766e;
    --color-image-bg: #e8f1f7;
    --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, monospace;
    --space-xs: 0.35rem;
    --space-sm: 0.75rem;
    --space-md: 1.25rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --radius: 10px;
    --shadow: 0 10px 40px rgba(15, 23, 42, 0.08);
    --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.06);
    --max-width: 72rem;
    --header-h: 4rem;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-sans);
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--color-text);
    background: radial-gradient(900px 480px at 0% 0%, #e0f2fe 0%, transparent 55%),
        radial-gradient(800px 420px at 100% 0%, #ccfbf1 0%, transparent 50%),
        var(--color-bg);
}

a {
    color: var(--color-accent);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

a:hover {
    color: var(--color-accent-dim);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--color-surface) 92%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
    min-height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.site-logo {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    color: var(--color-text);
    text-decoration: none;
}

.site-logo:hover {
    color: var(--color-accent);
}

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

.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    cursor: pointer;
}

.nav__toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    margin: 0 auto;
    background: var(--color-text);
    border-radius: 1px;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav__link {
    color: var(--color-muted);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius);
}

.nav__link:hover {
    color: var(--color-text);
    background: var(--color-surface);
}

.nav__link--active {
    color: var(--color-accent-dim);
    background: color-mix(in srgb, var(--color-accent) 16%, transparent);
}

@media (max-width: 640px) {
    .nav__toggle {
        display: flex;
    }

    .nav__menu {
        display: none;
        position: absolute;
        top: calc(var(--header-h) - 1px);
        right: var(--space-md);
        flex-direction: column;
        align-items: stretch;
        padding: var(--space-sm);
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        min-width: 12rem;
    }

    .nav__menu.is-open {
        display: flex;
    }

    .nav__link {
        padding: var(--space-sm);
    }
}

.main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md) var(--space-xl);
}

.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) var(--space-md);
    margin-top: var(--space-xl);
}

.site-footer__text {
    max-width: var(--max-width);
    margin: 0 auto;
    color: var(--color-muted);
    font-size: 0.9rem;
    text-align: center;
}

.hero {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    gap: var(--space-lg);
    justify-items: center;
    text-align: center;
    max-width: 40rem;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--space-xl);
}

.hero__intro {
    width: 100%;
    min-width: 0;
}

.hero__avatar-wrap {
    flex-shrink: 0;
}

.hero__avatar {
    width: 11.5rem;
    height: 11.5rem;
    max-width: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-surface);
    box-shadow: var(--shadow-card), 0 0 0 1px var(--color-border);
}

.hero__body {
    width: 100%;
    min-width: 0;
}

.hero__eyebrow {
    margin: 0 0 var(--space-sm);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-accent);
}

.hero__title {
    margin: 0;
    font-size: clamp(2rem, 4vw, 2.75rem);
    line-height: 1.15;
    letter-spacing: -0.03em;
}

@media (min-width: 701px) {
    .hero {
        grid-template-columns: auto 1fr;
        grid-template-rows: auto auto;
        column-gap: var(--space-xl);
        row-gap: var(--space-md);
        align-items: center;
        justify-items: stretch;
        text-align: left;
        max-width: 54rem;
        margin-left: 0;
        margin-right: 0;
    }

    .hero__intro {
        grid-column: 2;
        grid-row: 1;
    }

    .hero__avatar-wrap {
        grid-column: 1;
        grid-row: 1 / span 2;
        align-self: center;
        justify-self: start;
    }

    .hero__body {
        grid-column: 2;
        grid-row: 2;
    }

    .hero__avatar {
        width: 16rem;
        height: 16rem;
    }
}

.hero__lead {
    margin: 0 0 var(--space-md);
    font-size: 1.15rem;
    color: var(--color-muted);
}

.hero__text {
    margin: 0;
    color: var(--color-muted);
}

.section__head {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.section__title {
    margin: 0;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
}

.section__link {
    font-weight: 500;
}

.empty-state {
    color: var(--color-muted);
    margin: 0;
}

.card-grid {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: var(--space-lg);
    grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
}

.card {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: calc(var(--radius) + 4px);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.card__image-link {
    display: block;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--color-image-bg);
}

.card__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.35s ease;
}

.card__image-link:hover .card__image,
.card__image-link:focus-visible .card__image {
    transform: scale(1.03);
}

.card__body {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: var(--space-sm);
}

.card__title {
    margin: 0;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
}

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

.card__title a:hover {
    color: var(--color-accent);
}

.card__desc,
.card__summary {
    margin: 0;
    color: var(--color-muted);
    font-size: 0.98rem;
}

.card__meta {
    margin: -0.25rem 0 0;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.card__cta {
    margin-top: auto;
    font-weight: 600;
    align-self: flex-start;
}

.page-header {
    max-width: 44rem;
    margin-bottom: var(--space-xl);
}

.page-header__title {
    margin: 0 0 var(--space-sm);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    letter-spacing: -0.03em;
}

.page-header__lede {
    margin: 0;
    color: var(--color-muted);
    font-size: 1.05rem;
}

.project-detail__header {
    margin-bottom: var(--space-lg);
}

.project-detail__eyebrow {
    margin: 0 0 var(--space-xs);
    font-size: 0.9rem;
}

.project-detail__eyebrow a {
    color: var(--color-muted);
    text-decoration: none;
}

.project-detail__eyebrow a:hover {
    color: var(--color-accent);
}

.project-detail__title {
    margin: 0 0 var(--space-xs);
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    letter-spacing: -0.03em;
}

.project-detail__meta {
    margin: 0 0 var(--space-sm);
    color: var(--color-muted);
}

.tag-list {
    list-style: none;
    margin: 0 0 var(--space-md);
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.tag-list__item {
    font-size: 0.8rem;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--color-accent) 14%, transparent);
    color: var(--color-accent-dim);
    border: 1px solid color-mix(in srgb, var(--color-accent) 35%, transparent);
}

.project-detail__actions {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1rem;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    text-decoration: none;
    cursor: pointer;
}

.button:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.button--primary {
    background: var(--color-accent);
    border-color: var(--color-accent-dim);
    color: #ffffff;
}

.button--primary:hover {
    background: var(--color-accent-dim);
    border-color: var(--color-accent-dim);
    color: #ffffff;
}

.project-detail__figure {
    margin: 0 0 var(--space-lg);
    border-radius: calc(var(--radius) + 4px);
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: var(--color-image-bg);
}

.project-detail__image {
    width: 100%;
    height: auto;
}

.prose {
    max-width: 44rem;
    color: var(--color-muted);
}

.prose h3 {
    color: var(--color-text);
    margin: var(--space-lg) 0 var(--space-sm);
    font-size: 1.15rem;
}

.prose p,
.prose ul {
    margin: 0 0 var(--space-md);
}

.prose ul {
    padding-left: 1.25rem;
}

.prose code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 0.12em 0.4em;
    border-radius: 4px;
    background: #e2e8f0;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.demo-panel {
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    border-radius: calc(var(--radius) + 4px);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
}

.demo-panel__title {
    margin: 0 0 var(--space-sm);
    font-size: 1.2rem;
}

.demo-panel__note {
    margin: 0 0 var(--space-md);
    font-size: 0.95rem;
    color: var(--color-muted);
}

.demo-panel__frame-wrap {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: var(--color-image-bg);
    aspect-ratio: 16 / 10;
}

.demo-panel__frame {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}