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

:root {
    --font-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --line-height-base: 1.6;

    --bg: oklch(12% 0.03 260);
    --bg-elevated: oklch(16% 0.03 260);
    --border-subtle: oklch(30% 0.02 260);
    --text: oklch(96% 0.01 260);
    --text-muted: oklch(85% 0.01 260);
    --heading: oklch(98% 0.01 260);
    --accent: oklch(65% 0.18 255);
    --accent-strong: oklch(60% 0.22 255);
    --accent-soft: oklch(80% 0.08 255);
    --link: oklch(80% 0.18 250);
    --link-hover: oklch(90% 0.16 250);

    /* spacing */
    --space-xs: 0.4rem;
    --space-sm: 0.8rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;

    /* radius */
    --radius-sm: 0.4rem;
    --radius-md: 0.8rem;

    font-family: var(--font-base);
    line-height: var(--line-height-base);
    color: var(--text);
    background-color: var(--bg);
}

body {
    margin: 0;
    background-color: var(--bg);
}


.container {
    max-width: 90rem;
    margin-inline: auto;
    padding-inline: 1rem;
}

main {
    padding-block: var(--space-lg) calc(var(--space-lg) + 0.5rem);
}


h1,
h2,
h3 {
    color: var(--heading);
    margin-block: 0 0.5rem;
}

h1 {
    font-size: clamp(1.9rem, 4vw, 2.5rem);
}

h2 {
    font-size: 1.4rem;
}

h3 {
    font-size: 1.1rem;
}


.lead {
    margin-block: var(--space-xs) var(--space-md);
    color: var(--text-muted);
}


.section {
    margin-block-start: var(--space-lg);
}


.site-header {
    background-color: var(--bg-elevated);
    border-block-end: 1px solid var(--border-subtle);

    .header-inner {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
        padding-block: var(--space-sm);
        flex-wrap: wrap;
    }

    .logo a {
        text-decoration: none;
        color: var(--heading);
        font-weight: 700;
        letter-spacing: 0.08em;
        text-transform: uppercase;
    }

    .main-nav {
        ul {
            list-style: none;
            display: flex;
            gap: 1rem;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
        }

        a {
            text-decoration: none;
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        a:hover,
        a[aria-current="page"] {
            color: var(--heading);
        }
    }
}


.hero-title {
    margin-block: 0 0.4rem;
}

.hero-subtitle {
    max-width: 32rem;
    margin-block: 0 var(--space-sm);
    color: var(--text-muted);
}

.hero-actions {
    margin-block-end: var(--space-md);
}

.hero-button {
    display: inline-block;
    padding-block: 0.6rem;
    padding-inline: 1.2rem;
    background-color: var(--accent);
    color: var(--bg);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.hero-button:hover {
    background-color: var(--accent-strong);
    color: var(--bg);
}



.hero-image {
    width: 100%;
    max-width: 28rem;
    border-radius: var(--radius-md);
    display: block;
}

.profile-image {
    width: 10rem;
    max-width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border-radius: 50%;
    display: block;
}


.content-card {
    border-block-start: 1px solid var(--border-subtle);
    padding-block-start: var(--space-sm);
    margin-block-start: var(--space-md);

    img {
        width: 100%;
        max-width: 40rem;
        display: block;
        margin-block-start: var(--space-sm);
        border-radius: var(--radius-md);
    }
}


.bullets {
    margin: 0;
    padding-inline-start: 1.2rem;
}


.social-list {
    list-style: none;
    margin: 0;
    padding: 0;

    li + li {
        margin-block-start: 0.25rem;
    }

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

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


.labs {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
    justify-content: center;

    li {
        display: flex;
        flex-direction: column;
        position: relative;
        border-block-start: 1px solid var(--border-subtle);
        padding-block: var(--space-sm);
        flex: 0 0 18rem;
        max-width: 18rem;
    }

    h3 {
        font-size: 1.05rem;
        font-weight: 700;
        margin-block-end: 0.25rem;
    }

    p {
        color: var(--text-muted);
        margin-block-end: 0.6rem;
    }

    img {
        order: -1;
        width: 100%;
        border-radius: var(--radius-md);
        margin-block-end: 0.75rem;
        display: block;
        aspect-ratio: 16 / 9;
        object-fit: cover;
    }

    .overlay-link {
        position: absolute;
        inset: 0;
        text-indent: 100%;
        white-space: nowrap;
        overflow: hidden;
    }

    li a:not(.overlay-link) {
        position: relative;
        z-index: 1;
        align-self: flex-start;
        color: var(--link);
        font-weight: 500;
        text-decoration: none;
    }

    li a:not(.overlay-link):hover {
        text-decoration: underline;
        color: var(--link-hover);
    }
}

a.p1 {
    color: var(--link);
    font-weight: 500;
}

a.p1:hover {
    color: var(--link-hover);
    text-decoration: underline;
}



.site-footer {
    border-block-start: 1px solid var(--border-subtle);
    padding-block: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    color: var(--text-muted);
    background-color: var(--bg-elevated);
    text-align: center;
}


.contact-form {
    max-width: 36rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-field {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    margin-block-end: 0.75rem;
}

.form-field label,
.form-field legend {
    font-weight: 600;
    font-size: 0.95rem;
}

.form-field input,
.form-field textarea,
.form-field select {
    width: 100%;
    padding: 0.55rem 0.65rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
    background-color: var(--bg-elevated);
    color: var(--text);
    font: inherit;
}

.form-field textarea {
    resize: vertical;
    min-height: 7rem;
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
    outline: 2px solid var(--accent-strong);
    outline-offset: 2px;
}

fieldset.form-field {
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1rem;
    gap: 0.75rem;
    width: 100%;
}

fieldset.form-field label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.form-error {
    color: oklch(75% 0.18 20);
    font-size: 0.85rem;
    margin: 0;
}

.form-field--invalid input,
.form-field--invalid textarea,
.form-field--invalid select {
    border-color: oklch(65% 0.2 20);
}

.contact-form button {
    align-self: flex-start;
    margin-top: 0.5rem;
}