:root {
    --bg: #050608;
    --accent: #5b8cff;
    --accent-purple: #a855f7;
    --text: #f5f5f5;
    --muted: #9ca3af;
    --radius-lg: 18px;
    --radius-full: 999px;
    --shadow-soft: 0 18px 45px rgba(0,0,0,.55);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    min-height: 100vh;
}

/* ── PARTICLES ── */
#particles {
    position: fixed;
    inset: 0;
    z-index: 0;
    opacity: .4;
    pointer-events: none;
}

/* ── HEADER ── */
.main-header {
    padding: 1.5rem clamp(1.5rem,4vw,4rem);
    position: sticky;
    top: 0;
    background: rgba(5,6,8,.85);
    backdrop-filter: blur(20px);
    z-index: 200;
    border-bottom: 1px solid rgba(148,163,184,.1);
}

.nav {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 1120px;
    margin: 0 auto;
    position: relative;
}

.nav__links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

    .nav__links a {
        position: relative;
        color: var(--muted);
        font-size: .92rem;
        text-decoration: none;
        transition: color .3s;
    }

        .nav__links a::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -.2rem;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), var(--accent-purple));
            border-radius: var(--radius-full);
            transition: width .3s;
        }

        .nav__links a:hover,
        .nav__links a.active {
            color: var(--text);
        }

            .nav__links a:hover::after,
            .nav__links a.active::after {
                width: 100%;
            }

.nav__toggle {
    position: absolute;
    right: 0;
    display: none;
    flex-direction: column;
    gap: .25rem;
    background: transparent;
    border: none;
    cursor: pointer;
}

    .nav__toggle span {
        width: 22px;
        height: 2px;
        border-radius: var(--radius-full);
        background: #e5e7eb;
        display: block;
    }

/* ── PAGE HERO ── */
.page-hero {
    max-width: 1120px;
    margin: 3.5rem auto 0;
    padding: 0 clamp(1.5rem,4vw,4rem);
    text-align: center;
    position: relative;
    z-index: 1;
    animation: fadeUp .7s ease both;
}

    .page-hero h1 {
        font-size: clamp(2.2rem,5vw,3.5rem);
        font-weight: 800;
        line-height: 1.1;
        margin-bottom: .7rem;
    }

        .page-hero h1 span {
            background: linear-gradient(135deg, var(--accent), var(--accent-purple));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

    .page-hero p {
        color: var(--muted);
        font-size: 1.05rem;
    }

/* ── FILTER BAR ── */
.filter-section {
    max-width: 1120px;
    margin: 2rem auto 0;
    padding: 0 clamp(1.5rem,4vw,4rem);
    position: relative;
    z-index: 1;
}

.filter-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: .6rem;
    justify-content: center;
    padding: 1.1rem 1.4rem;
    background: rgba(15,23,42,.7);
    border: 1px solid rgba(148,163,184,.18);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
}

.filter-btn {
    padding: .4rem 1.1rem;
    border-radius: var(--radius-full);
    border: 1px solid rgba(148,163,184,.3);
    background: transparent;
    color: var(--muted);
    font-size: .82rem;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: .08em;
    cursor: pointer;
    transition: all .2s ease;
}

    .filter-btn:hover {
        color: var(--text);
        border-color: var(--accent);
        background: rgba(91,140,255,.07);
    }

    .filter-btn.active {
        background: linear-gradient(135deg, var(--accent), var(--accent-purple));
        color: #fff;
        border-color: transparent;
        box-shadow: 0 4px 16px rgba(91,140,255,.35);
    }

/* ── GRID ── */
.projects-section {
    max-width: 1120px;
    margin: 2.5rem auto 5rem;
    padding: 0 clamp(1.5rem,4vw,4rem);
    position: relative;
    z-index: 1;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px,1fr));
    gap: 1.8rem;
}

/* ── CARD ── */
.project-card {
    background: rgba(15,23,42,.7);
    border: 1px solid rgba(148,163,184,.18);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: transform .3s, box-shadow .3s, border-color .3s, opacity .3s;
    animation: fadeUp .5s ease both;
    position: relative;
    will-change: transform;
}

    .project-card:hover {
        transform: translateY(-7px) scale(1.015);
        box-shadow: 0 24px 55px rgba(91,140,255,.2);
        border-color: rgba(91,140,255,.5);
    }

body.modal-open .project-card:not(.is-expanded) {
    opacity: .25;
    pointer-events: none;
    transform: scale(.97);
}

.project-card.hidden {
    display: none !important;
}

/* image thumbnail */
.card-img {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
}

    .card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
        transition: transform .4s ease;
    }

.project-card:hover .card-img img {
    transform: scale(1.07);
}

.card-img-overlay {
    position: absolute;
    inset: 0;
    background: rgba(5,6,8,.55);
    backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity .3s;
}

.project-card:hover .card-img-overlay {
    opacity: 1;
}

.card-img-overlay span {
    color: #fff;
    font-size: .95rem;
    font-weight: 600;
    letter-spacing: .05em;
    transform: translateY(8px);
    transition: transform .3s;
}

.project-card:hover .card-img-overlay span {
    transform: translateY(0);
}

.card-body {
    padding: 1.1rem 1.3rem 1.3rem;
}

.card-name {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: .65rem;
    color: var(--text);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
}

/* ── TAG BADGES ── */
.ptag {
    display: inline-flex;
    align-items: center;
    padding: .25rem .7rem;
    border-radius: var(--radius-full);
    font-size: .72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    border: 1px solid currentColor;
}

.ptag-unity {
    color: #38bdf8;
    background: rgba(56,189,248,.1);
}

.ptag-unreal {
    color: #a855f7;
    background: rgba(168,85,247,.1);
}

.ptag-cpp {
    color: #3b82f6;
    background: rgba(59,130,246,.1);
}

.ptag-cs {
    color: #8b5cf6;
    background: rgba(139,92,246,.1);
}

.ptag-1sem {
    color: #facc15;
    background: rgba(250,204,21,.1);
}

.ptag-2sem {
    color: #22c55e;
    background: rgba(34,197,94,.1);
}

.ptag-solo {
    color: #ef4444;
    background: rgba(239,68,68,.1);
}

.no-results {
    display: none;
    text-align: center;
    color: var(--muted);
    font-size: 1.05rem;
    margin-top: 3rem;
    grid-column: 1/-1;
}

/* ══════════════════════════════════════════
   EXPANDED CARD
══════════════════════════════════════════ */
.expanded-card {
    position: fixed;
    z-index: 300;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: radial-gradient(circle at top left, #1b2440 0, #0a0d18 60%);
    border: 1px solid rgba(91,140,255,.4);
    box-shadow: 0 40px 90px rgba(0,0,0,.85), 0 0 0 1px rgba(91,140,255,.15);
    display: flex;
    flex-direction: column;
    cursor: default;
}

    .expanded-card.animating {
        transition: top .5s cubic-bezier(.32,0,.12,1), left .5s cubic-bezier(.32,0,.12,1), width .5s cubic-bezier(.32,0,.12,1), height .5s cubic-bezier(.32,0,.12,1), border-radius .5s ease;
    }

    .expanded-card.closing {
        transition: top .4s cubic-bezier(.32,0,.12,1), left .4s cubic-bezier(.32,0,.12,1), width .4s cubic-bezier(.32,0,.12,1), height .4s cubic-bezier(.32,0,.12,1), border-radius .4s ease, opacity .35s ease;
    }

    .expanded-card .exp-content {
        flex: 1;
        min-height: 0;
        overflow-y: auto;
        opacity: 0;
        transition: opacity .25s ease .3s;
        display: flex;
        flex-direction: column;
        scrollbar-width: thin;
        scrollbar-color: var(--accent) transparent;
    }

    .expanded-card.show-content .exp-content {
        opacity: 1;
    }

/* Bouton fermer */
.exp-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 10;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(15,23,42,.9);
    border: 1px solid rgba(148,163,184,.3);
    color: var(--text);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity .2s ease .35s, background .2s, border-color .2s, color .2s;
}

.expanded-card.show-content .exp-close {
    opacity: 1;
}

.exp-close:hover {
    background: rgba(239,68,68,.2);
    border-color: #ef4444;
    color: #ef4444;
}

/* Media gallery */
.exp-media {
    display: flex;
    gap: .75rem;
    overflow-x: auto;
    padding: 1.4rem 1.4rem 0;
    flex-shrink: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--accent) transparent;
}

    .exp-media img,
    .exp-media video,
    .exp-media iframe {
        flex-shrink: 0;
        border-radius: 12px;
        border: 1px solid rgba(148,163,184,.2);
        height: clamp(140px, 28vh, 260px);
        object-fit: cover;
    }

    .exp-media > *:only-child {
        width: 100%;
        flex-shrink: 1;
    }

    .exp-media > *:not(:only-child) {
        width: 480px;
    }

/* Zone texte + boutons */
.exp-info {
    padding: 1.2rem 1.4rem 1.4rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.exp-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: .8rem;
    margin-bottom: .9rem;
}

.exp-title {
    font-size: clamp(1.3rem,3vw,2rem);
    font-weight: 800;
    flex: 1;
    background: linear-gradient(135deg, #fff, var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.exp-tags {
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
    align-self: center;
}

.exp-desc {
    color: var(--muted);
    line-height: 1.75;
    font-size: .95rem;
    margin-bottom: 1.2rem;
    flex: 1;
}

.exp-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .8rem;
    padding-top: .8rem;
    border-top: 1px solid rgba(148,163,184,.1);
    margin-top: auto;
}

/* ── Boutons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    padding: .65rem 1.4rem;
    border-radius: var(--radius-full);
    font-size: .9rem;
    font-family: inherit;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all .3s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-purple));
    color: #f9fafb;
    box-shadow: var(--shadow-soft);
}

    .btn-primary:hover {
        transform: translateY(-3px);
        box-shadow: 0 20px 45px rgba(91,140,255,.4);
    }

.btn-ghost {
    background: rgba(15,23,42,.6);
    border-color: rgba(148,163,184,.45);
    color: var(--muted);
}

    .btn-ghost:hover {
        background: rgba(30,64,175,.25);
        color: var(--text);
        border-color: var(--accent);
    }

.btn-itch {
    border-color: rgba(250,65,28,.45);
    color: #fa6040;
}

    .btn-itch:hover {
        background: rgba(250,65,28,.12);
        border-color: #fa6040;
        color: var(--text);
    }

.btn-yt {
    border-color: rgba(255,0,0,.45);
    color: #ff4444;
}

    .btn-yt:hover {
        background: rgba(255,0,0,.12);
        border-color: #ff0000;
        color: var(--text);
    }

/* ── FOOTER ── */
.main-footer {
    background: #111;
    color: #eee;
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
    border-top: 1px solid rgba(148, 163, 184, 0.1);
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
}

.footer-name {
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.footer-mail a {
    color: #eee;
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-links {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn--footer {
    background: #222;
    color: #eee;
    padding: 0.6rem 1.2rem;
    border-radius: 5px;
    text-decoration: none;
    transition: all 0.3s;
}

    .btn--footer:hover {
        background: linear-gradient(135deg, var(--accent), var(--accent-purple));
        transform: translateY(-3px);
    }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── LANG SWITCHER ── */
#langSwitcher {
    display: flex;
    gap: .4rem;
    align-items: center;
    position: absolute;
    left: 0;
}

.lang-btn {
    background: transparent;
    border: 2px solid transparent;
    border-radius: 6px;
    padding: 2px;
    cursor: pointer;
    opacity: .5;
    transition: opacity .2s, border-color .2s, transform .2s;
    line-height: 0;
}

    .lang-btn img {
        width: 28px;
        height: 20px;
        object-fit: cover;
        border-radius: 3px;
        display: block;
    }

    .lang-btn:hover {
        opacity: .85;
        transform: scale(1.08);
    }

    .lang-btn.active {
        opacity: 1;
        border-color: var(--accent);
    }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
    .nav {
        justify-content: flex-end;
    }

    #langSwitcher {
        position: absolute;
        left: 0;
        right: auto;
    }

    .nav__toggle {
        display: flex;
    }

    .nav__links {
        position: absolute;
        top: calc(100% + .5rem);
        right: 0;
        flex-direction: column;
        gap: .5rem;
        padding: .8rem 1rem;
        background: rgba(15,23,42,.97);
        border-radius: 14px;
        backdrop-filter: blur(14px);
        transform-origin: top;
        transform: scaleY(0);
        opacity: 0;
        pointer-events: none;
        transition: .15s ease;
    }

        .nav__links.open {
            transform: scaleY(1);
            opacity: 1;
            pointer-events: auto;
        }

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

    .exp-actions {
        flex-direction: column;
    }

        .exp-actions .btn {
            justify-content: center;
        }
}