/* ============================================================
   COMMUNITAS Replication Academy — base design system
   Aligned with parent site (communitas-project.eu): Ubuntu + coral
   ============================================================ */

:root {
    /* Surface */
    --paper:        #ffffff;
    --paper-2:      #f8f9fa;
    --paper-3:      #e9ecef;
    --paper-line:   rgba(33, 37, 41, 0.10);
    --paper-rule:   rgba(33, 37, 41, 0.16);

    /* Ink */
    --ink:          #212529;
    --ink-soft:     #495057;
    --ink-muted:    #6c757d;
    --ink-faint:    #adb5bd;

    /* Accents */
    --accent:       #ec644c;
    --accent-deep:  #b64e37;
    --accent-soft:  #fbe2d9;
    --accent-glow:  rgba(236, 100, 76, 0.16);

    /* Footer */
    --night:        #202325;
    --night-2:      #2a2d2f;
    --night-soft:   #4a4d50;
    --night-text:   #ced4da;

    /* Type */
    --font-body:    'Ubuntu', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-display: 'Ubuntu', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-mono:    'Ubuntu Mono', ui-monospace, 'Cascadia Mono', Menlo, monospace;

    /* Fluid type scale */
    --t-eyebrow:    clamp(0.72rem, 0.68rem + 0.18vw, 0.82rem);
    --t-small:      clamp(0.82rem, 0.78rem + 0.2vw, 0.92rem);
    --t-body:       clamp(0.98rem, 0.94rem + 0.2vw, 1.08rem);
    --t-lede:       clamp(1.1rem, 1rem + 0.45vw, 1.4rem);
    --t-h3:         clamp(1.2rem, 1.05rem + 0.7vw, 1.55rem);
    --t-h2:         clamp(1.8rem, 1.3rem + 2.2vw, 3rem);
    --t-h1:         clamp(2.2rem, 1.5rem + 3.6vw, 4.5rem);

    /* Layout */
    --gutter:       clamp(1.25rem, 1rem + 1.5vw, 2.5rem);
    --container:    min(1240px, 100% - var(--gutter) * 2);
    --container-w:  min(1440px, 100% - var(--gutter) * 2);
    --header-h:     clamp(64px, 6vh + 32px, 88px);

    /* Misc */
    --radius-sm:    4px;
    --radius:       8px;
    --radius-lg:    14px;
    --shadow-soft:  0 1px 2px rgba(33,37,41,0.04), 0 6px 18px rgba(33,37,41,0.06);
    --shadow-lift:  0 2px 4px rgba(33,37,41,0.06), 0 14px 32px rgba(33,37,41,0.08);
    --ease:         cubic-bezier(0.22, 1, 0.36, 1);
    --ease-snap:    cubic-bezier(0.7, 0, 0.2, 1);
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: var(--t-body);
    font-weight: 400;
    line-height: 1.55;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
body.nav-open { overflow: hidden; }

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; padding: 0; }
input, textarea, select { font: inherit; color: inherit; }

::selection { background: var(--accent); color: var(--paper); }

/* Skip link */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}
.skip-link:focus {
    left: 1rem; top: 1rem;
    width: auto; height: auto;
    padding: 0.6rem 1rem;
    background: var(--ink);
    color: var(--paper);
    z-index: 1000;
    border-radius: var(--radius-sm);
}

/* ---------- Typography utilities ---------- */
.eyebrow {
    font-family: var(--font-body);
    font-size: var(--t-eyebrow);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-weight: 500;
    color: var(--ink-muted);
    display: inline-flex;
    align-items: center;
    gap: 0.75em;
}
.eyebrow::before {
    content: "";
    display: inline-block;
    width: 1.6em;
    height: 1px;
    background: currentColor;
    opacity: 0.7;
}
.eyebrow--accent { color: var(--accent); }

/* ---------- Container ---------- */
.container {
    width: var(--container);
    margin-inline: auto;
}
.container--wide {
    width: var(--container-w);
}

/* ---------- Section head ---------- */
.section-head {
    display: grid;
    gap: 0.9rem;
    margin-bottom: clamp(2rem, 1rem + 4vw, 4rem);
    max-width: 52ch;
}
.section-head__title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--t-h2);
    line-height: 1.1;
    letter-spacing: -0.01em;
    margin: 0;
    color: var(--ink);
}
.section-head--centered {
    margin-inline: auto;
    text-align: center;
    justify-items: center;
}

/* ---------- Buttons ---------- */
.btn {
    --btn-bg: var(--accent);
    --btn-fg: #ffffff;
    --btn-bd: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 0.6em;
    padding: 0.85em 1.4em;
    font-family: var(--font-body);
    font-weight: 500;
    font-size: var(--t-small);
    letter-spacing: 0.02em;
    line-height: 1;
    border-radius: var(--radius-sm);
    background: var(--btn-bg);
    color: var(--btn-fg);
    border: 1px solid var(--btn-bd);
    transition: background 0.25s, color 0.25s, border-color 0.25s, transform 0.25s var(--ease);
    will-change: transform;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
    --btn-bg: var(--accent);
    --btn-fg: #ffffff;
    --btn-bd: var(--accent);
}
.btn--primary:hover {
    --btn-bg: var(--accent-deep);
    --btn-bd: var(--accent-deep);
}

.btn--ghost {
    --btn-bg: transparent;
    --btn-fg: var(--ink);
    --btn-bd: var(--paper-rule);
}
.btn--ghost:hover {
    --btn-bg: var(--ink);
    --btn-fg: var(--paper);
    --btn-bd: var(--ink);
}

.btn--large {
    padding: 1em 1.7em;
    font-size: var(--t-body);
}

.btn .arrow {
    display: inline-block;
    transition: transform 0.25s var(--ease);
}
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- Reveal ---------- */
[data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].is-visible {
    opacity: 1;
    transform: none;
}
[data-reveal][data-delay="1"] { transition-delay: 0.06s; }
[data-reveal][data-delay="2"] { transition-delay: 0.12s; }
[data-reveal][data-delay="3"] { transition-delay: 0.18s; }
[data-reveal][data-delay="4"] { transition-delay: 0.24s; }
[data-reveal][data-delay="5"] { transition-delay: 0.30s; }

@media (prefers-reduced-motion: reduce) {
    [data-reveal] { opacity: 1; transform: none; transition: none; }
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

/* ---------- Footer ---------- */
.site-footer {
    margin-top: clamp(4rem, 4vw + 2rem, 8rem);
    background: var(--night);
    color: var(--night-text);
    position: relative;
}
.site-footer__inner {
    width: var(--container);
    margin-inline: auto;
    padding: clamp(3rem, 5vw, 5rem) 0 clamp(1.8rem, 3vw, 2.5rem);
    display: grid;
    gap: clamp(2rem, 3vw, 3rem);
    grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
    align-items: start;
    position: relative;
    z-index: 1;
}
@media (max-width: 900px) {
    .site-footer__inner { grid-template-columns: 1fr 1fr; }
    .site-footer__col--brand { grid-column: 1 / -1; }
    .site-footer__col--funding { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
    .site-footer__inner { grid-template-columns: 1fr; }
}

.site-footer__brand {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: #ffffff;
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 0.8rem + 1.2vw, 1.7rem);
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: color 0.25s;
}
.site-footer__brand:hover { color: var(--accent); }
.site-footer__logo {
    width: 2.2rem;
    height: 2.2rem;
    filter: brightness(0) invert(1);
    opacity: 0.9;
}
.site-footer__tagline {
    margin: 1.2rem 0 1.6rem;
    max-width: 36ch;
    color: var(--night-text);
    font-size: var(--t-small);
    line-height: 1.6;
    opacity: 0.8;
    font-weight: 300;
}
.site-footer__heading {
    display: block;
    font-family: var(--font-body);
    font-size: var(--t-eyebrow);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 1rem;
}
.site-footer__links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.6rem;
}
.site-footer__links a {
    color: var(--night-text);
    font-size: var(--t-small);
    font-weight: 300;
    transition: color 0.25s;
}
.site-footer__links a:hover {
    color: var(--accent);
}

.site-footer__socials {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 0.8rem;
}
.site-footer__socials a {
    width: 2.1rem;
    height: 2.1rem;
    border: 1px solid rgba(206, 212, 218, 0.2);
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.25s, border-color 0.25s, transform 0.25s var(--ease);
}
.site-footer__socials svg {
    width: 0.85rem;
    height: 0.85rem;
    fill: var(--night-text);
    transition: fill 0.25s;
}
.site-footer__socials a:hover {
    background: var(--accent);
    border-color: var(--accent);
    transform: translateY(-1px);
}
.site-footer__socials a:hover svg { fill: #ffffff; }

.site-footer__funding {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 1rem;
    align-items: start;
}
.site-footer__eu {
    width: 64px;
    height: auto;
    border-radius: 2px;
}
.site-footer__funding p {
    margin: 0;
    font-size: var(--t-eyebrow);
    line-height: 1.6;
    color: var(--night-text);
    opacity: 0.8;
    font-weight: 300;
}

.site-footer__legal {
    border-top: 1px solid rgba(206, 212, 218, 0.12);
    padding: 1.2rem 0 1.8rem;
    width: var(--container);
    margin-inline: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.78rem;
    color: var(--night-text);
    opacity: 0.6;
    position: relative;
    z-index: 1;
}
.site-footer__legal-links {
    display: inline-flex;
    gap: 1.4rem;
}
.site-footer__legal a:hover { color: var(--accent); opacity: 1; }