:root {
    --color-bg: #ffffff;
    --color-bg-alt: #f5f7fb;
    --color-surface: #ffffff;
    --color-text: #1b2333;
    --color-muted: #5b6577;
    --color-border: #e3e7ef;
    --color-accent: #2f6fed;
    --color-accent-hover: #1f56c7;
    --color-accent-contrast: #ffffff;
    --color-tag-bg: #eaf0fd;
    --color-tag-text: #1f4fb5;
    --color-success: #1a7f4b;
    --color-success-bg: #e8f6ee;
    --color-error: #c0362c;
    --color-error-bg: #fdecea;

    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --radius: 12px;
    --shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 4px 16px rgb(16 24 40 / 6%);
    --container: 1100px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f1420;
        --color-bg-alt: #151c2b;
        --color-surface: #18202f;
        --color-text: #e7ebf3;
        --color-muted: #9aa5b8;
        --color-border: #263045;
        --color-accent: #5b8ef5;
        --color-accent-hover: #7aa4f8;
        --color-accent-contrast: #0f1420;
        --color-tag-bg: #1e2a44;
        --color-tag-text: #a9c3fa;
        --color-success: #5fd39a;
        --color-success-bg: #12291f;
        --color-error: #f28b82;
        --color-error-bg: #2c1614;
        --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 4px 16px rgb(0 0 0 / 25%);
    }
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

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

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

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

.container {
    width: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: 1.25rem;
}

.container--narrow {
    max-width: 760px;
}

.skip-link {
    position: absolute;
    left: 1rem;
    top: -3rem;
    padding: 0.5rem 1rem;
    background: var(--color-accent);
    color: var(--color-accent-contrast);
    border-radius: var(--radius);
    z-index: 100;
}

.skip-link:focus {
    top: 1rem;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: color-mix(in srgb, var(--color-bg) 85%, transparent);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 4rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--color-text);
    font-weight: 700;
    text-decoration: none;
}

.brand:hover {
    color: var(--color-text);
}

.brand__mark {
    display: grid;
    place-items: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 9px;
    background: var(--color-accent);
    color: var(--color-accent-contrast);
    font-size: 0.85rem;
    letter-spacing: 0.02em;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.site-nav a:not(.button) {
    color: var(--color-muted);
    font-weight: 500;
    text-decoration: none;
}

.site-nav a:not(.button):hover {
    color: var(--color-text);
}

/* Buttons */
.button {
    display: inline-block;
    padding: 0.75rem 1.4rem;
    border: 2px solid var(--color-accent);
    border-radius: 999px;
    background: var(--color-accent);
    color: var(--color-accent-contrast);
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

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

.button--ghost {
    background: transparent;
    color: var(--color-accent);
}

.button--ghost:hover {
    background: var(--color-tag-bg);
    color: var(--color-accent-hover);
}

.button--small {
    padding: 0.4rem 1rem;
    font-size: 0.95rem;
}

/* Hero */
.hero {
    padding-block: clamp(4rem, 12vw, 8rem);
}

.eyebrow {
    margin: 0 0 1rem;
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.hero__title {
    margin: 0;
    font-size: clamp(2.25rem, 6vw, 3.75rem);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero__tagline {
    max-width: 40rem;
    margin: 1.5rem 0 2rem;
    color: var(--color-muted);
    font-size: clamp(1.1rem, 2.2vw, 1.3rem);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

/* Sections */
.section {
    padding-block: clamp(3.5rem, 8vw, 5.5rem);
}

.section--alt {
    background: var(--color-bg-alt);
}

.section__title {
    margin: 0 0 2rem;
    font-size: clamp(1.6rem, 3.5vw, 2.1rem);
    letter-spacing: -0.01em;
}

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

/* Projects */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
    gap: 1.25rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform 0.15s, border-color 0.15s;
}

.project-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent);
}

.project-card__image {
    display: block;
    width: calc(100% + 3rem);
    max-width: none;
    aspect-ratio: 16 / 9;
    margin: -1.5rem -1.5rem 0.25rem;
    object-fit: cover;
    border-radius: var(--radius) var(--radius) 0 0;
    border-bottom: 1px solid var(--color-border);
}

.project-card__title {
    margin: 0;
    font-size: 1.2rem;
}

.project-card__summary {
    margin: 0;
    color: var(--color-muted);
    flex: 1;
}

.project-card__title a {
    color: inherit;
    text-decoration: none;
}

.project-card__title a::after {
    content: "";
    position: absolute;
    inset: 0;
}

.project-card {
    position: relative;
}

.section__more {
    margin: 2rem 0 0;
    font-weight: 600;
}

.section__more a {
    text-decoration: none;
}

/* Project pages */
.page-title {
    margin: 0 0 1rem;
    font-size: clamp(2rem, 5vw, 2.75rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1.5rem 0 2.5rem;
}

.filter {
    padding: 0.35rem 0.9rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    color: var(--color-muted);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
}

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

.filter--active,
.filter--active:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-accent-contrast);
}

.back-link {
    display: inline-block;
    margin-bottom: 1.5rem;
    font-weight: 500;
    text-decoration: none;
}

.project-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    margin: 1.5rem 0 1rem;
    padding: 0;
    list-style: none;
    color: var(--color-muted);
}

.project-cover {
    display: block;
    width: 100%;
    height: auto;
    margin-top: 2rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.prose {
    margin-top: 2rem;
    font-size: 1.1rem;
}

a.tag {
    display: inline-block;
    text-decoration: none;
}

a.tag:hover {
    background: var(--color-accent);
    color: var(--color-accent-contrast);
}

.site-nav a[aria-current="page"] {
    color: var(--color-text);
}

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.tag {
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-size: 0.85rem;
    font-weight: 500;
}

/* Skills */
.skills {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr));
    gap: 1.75rem;
}

.skills__category {
    margin: 0 0 0.75rem;
    font-size: 1rem;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Contact */
.contact {
    text-align: center;
}

.contact .lead {
    margin-bottom: 1.75rem;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    color: var(--color-muted);
    font-size: 0.95rem;
}

.site-footer__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 1.75rem;
}

.site-footer p {
    margin: 0;
}

.social-links {
    display: flex;
    gap: 1.25rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

/* Contact form */
.contact-form {
    display: grid;
    gap: 1.25rem;
    margin-top: 2rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
    gap: 1.25rem;
}

.contact-form label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 600;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.75rem 0.9rem;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    background: var(--color-surface);
    color: var(--color-text);
    font: inherit;
}

.contact-form textarea {
    resize: vertical;
    min-height: 10rem;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--color-accent);
    outline: 3px solid color-mix(in srgb, var(--color-accent) 25%, transparent);
    outline-offset: 0;
}

.contact-form ul {
    margin: 0 0 0.4rem;
    padding: 0;
    list-style: none;
    color: var(--color-error);
    font-size: 0.95rem;
}

.contact-form [aria-invalid="true"] {
    border-color: var(--color-error);
}

.contact-form .button {
    justify-self: start;
    border: 0;
    cursor: pointer;
    font: inherit;
    font-weight: 600;
}

.form-row--honeypot {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.alert {
    margin-top: 1.5rem;
    padding: 0.9rem 1.1rem;
    border-radius: 10px;
    border: 1px solid;
    font-weight: 500;
}

.alert--success {
    background: var(--color-success-bg);
    border-color: var(--color-success);
    color: var(--color-success);
}

.alert--error {
    background: var(--color-error-bg);
    border-color: var(--color-error);
    color: var(--color-error);
}

/* Mobile */
@media (max-width: 640px) {
    .brand__name {
        display: none;
    }

    .site-nav {
        gap: 1rem;
        font-size: 0.95rem;
    }

    .site-nav a[href$="#competences"],
    .site-nav a[href$="#a-propos"] {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .project-card,
    .button {
        transition: none;
    }
}

/* Demo banner */
.demo-banner {
    padding: 0.55rem 1.25rem;
    background: var(--color-text);
    color: var(--color-bg);
    font-size: 0.9rem;
    text-align: center;
}

.demo-banner a {
    color: inherit;
    font-weight: 600;
}