:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --card-bg-parachess: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    --card-bg-disconnect: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --hover-glow: rgba(59, 130, 246, 0.5);
    --focus-ring: #60a5fa;
}

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

body {
    font-family: 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    padding: 60px 20px 60px;
}

.background {
    filter: contrast(50%);
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    user-select: none;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.portal-header {
    animation: fadeInDown 0.8s ease-out;
}

.portal-header-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.75rem;
    flex-wrap: wrap;
    text-align: left; /* le texte s'aligne à gauche à côté du logo */
}

.portal-header-text {
    display: flex;
    flex-direction: column;
}

.portal-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin: 0 0 0.25rem 0;
    background: linear-gradient(to right, #d4a373, #e9c46a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.portal-header p {
    font-size: 1.2rem;
    color: #c4b5a0;
    margin: 0;
}

.portal-header img {
    width: 200px;
    height: auto;
}

.logo-link {
    display: flex;
    line-height: 0;
}

.game-card.parachess {
    background: var(--card-bg-parachess);
    border: 1px solid #4a3b2c;
}

.game-card.parachess:hover {
    border-color: #6b5643;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 20px rgba(233, 196, 106, 0.15);
}

.footer-link {
    color: #c4b5a0;
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.2s ease, transform 0.2s ease;
    font-weight: 500;
}

.footer-link:hover,
.footer-link:focus-visible {
    color: #f5ede0;
    transform: scale(1.05);
    outline: none;
    text-shadow: 0 0 10px rgba(233, 196, 106, 0.3);
}

.footer-separator {
    color: #4a3b2c;
    user-select: none;
}

.cards-container {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    padding: 1rem;
    animation: fadeInUp 0.8s ease-out;
}

.game-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 300px;
    height: 300px;
    border-radius: 24px;
    text-decoration: none;
    color: white;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* Make it accessible via head-tracking and keyboard */
.game-card:focus {
    outline: none;
    border-color: var(--focus-ring);
    box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.3), 0 20px 40px rgba(0, 0, 0, 0.4);
    transform: translateY(-5px);
}

.game-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}


.game-card.disconnect {
    background: var(--card-bg-disconnect);
}

.game-card.disconnect:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 20px var(--hover-glow);
}

.game-icon {
    font-size: 5rem;
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease;
}

.game-card:hover .game-icon,
.game-card:focus .game-icon {
    transform: scale(1.1);
}

.game-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    z-index: 2;
}

.game-desc {
    font-size: 1rem;
    opacity: 0.8;
    text-align: center;
    padding: 0 1.5rem;
    z-index: 2;
}

/* Mini Boards */
.mini-board-wrapper {
    margin-bottom: 1.5rem;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
}

.game-card:hover .mini-board-wrapper,
.game-card:focus .mini-board-wrapper {
    transform: scale(1.1) translateY(-10px);
}

/* Chess Mini Board */
.mini-chess-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    width: 100px;
    height: 100px;
    border: 2px solid #334155;
    border-radius: 4px;
    overflow: hidden;
    background: #e2e8f0;
}

.mini-chess-board > div {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    color: #1e293b;
}

.mini-chess-board > div:nth-child(odd) {
    background: #cbd5e1;
}
.mini-chess-board > div.dark-cell {
    background: #64748b !important;
}

/* Connect 4 Mini Board */
.mini-connect-board {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(4, 1fr);
    width: 120px;
    height: 96px;
    background: #2563eb;
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.mini-connect-board > div {
    background: #0f172a;
    border-radius: 50%;
    width: 100%;
    height: 100%;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.5);
}

.mini-connect-board > div.red-chip {
    background: #ef4444;
    box-shadow: inset 0 -2px 4px rgba(0,0,0,0.2), 0 2px 4px rgba(255,255,255,0.3);
}

.mini-connect-board > div.blue-chip {
    background: #3b82f6;
    box-shadow: inset 0 -2px 4px rgba(0,0,0,0.2), 0 2px 4px rgba(255,255,255,0.3);
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Re-use eye tracker dot styling */
#head-tracker {
    position: fixed;
    width: 20px;
    height: 20px;
    background-color: rgba(255, 0, 0, 0.7);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    display: none;
    transition: left 0.05s ease-out, top 0.05s ease-out;
}

#head-tracker.active {
    display: block;
}

/* Minimal facial detection popup styling reused */
.popup {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: 1000;
    justify-content: center;
    align-items: center;
}
.popup.visible {
    display: flex;
}
.popup-body {
    background: #1e293b;
    padding: 2rem;
    border-radius: 12px;
    z-index: 1001;
    color: white;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    border: 1px solid #334155;
}
.popupBackground {
    position: absolute;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(4px);
}
.popup-option {
    background: #3b82f6;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    margin: 0.5rem 0;
}
.inline-options {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
}

/* Boutons de l'entête : suivi du visage, commande vocale, aide.
   Empilés verticalement les uns sous les autres, en s'adaptant à la
   présence ou non du bouton micro (masqué si le micro n'est pas disponible). */
#toggle-facial-button,
#toggle-vocal-button,
#help-button {
    position: absolute;
    top: 30px;
    right: 40px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border: 2px solid transparent;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

#toggle-facial-button:hover,
#toggle-vocal-button:hover,
#help-button:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

#toggle-facial-button img,
#toggle-vocal-button img,
#help-button img {
    max-width: 35px;
    max-height: 35px;
}

#toggle-vocal-button.hidden {
    display: none;
}

#toggle-facial-button:not(.hidden) ~ #toggle-vocal-button {
    top: 100px;
}

#toggle-facial-button.hidden ~ #toggle-vocal-button {
    top: 30px;
}

#toggle-facial-button:not(.hidden) ~ #toggle-vocal-button:not(.hidden) ~ #help-button {
    top: 170px;
}

#toggle-facial-button.hidden ~ #toggle-vocal-button:not(.hidden) ~ #help-button,
#toggle-facial-button:not(.hidden) ~ #toggle-vocal-button.hidden ~ #help-button {
    top: 100px;
}

#toggle-facial-button.hidden ~ #toggle-vocal-button.hidden ~ #help-button {
    top: 30px;
}

@media (max-width: 800px) {
    #toggle-facial-button,
    #toggle-vocal-button,
    #help-button {
        top: 20px;
        right: 20px;
        width: 50px;
        height: 50px;
    }

    #toggle-facial-button:not(.hidden) ~ #toggle-vocal-button {
        top: 80px;
    }

    #toggle-facial-button.hidden ~ #toggle-vocal-button {
        top: 20px;
    }

    #toggle-facial-button:not(.hidden) ~ #toggle-vocal-button:not(.hidden) ~ #help-button {
        top: 140px;
    }

    #toggle-facial-button.hidden ~ #toggle-vocal-button:not(.hidden) ~ #help-button,
    #toggle-facial-button:not(.hidden) ~ #toggle-vocal-button.hidden ~ #help-button {
        top: 80px;
    }

    #toggle-facial-button.hidden ~ #toggle-vocal-button.hidden ~ #help-button {
        top: 20px;
    }

    body {
        padding: 200px 16px 40px;
    }

    .portal-header h1 {
        font-size: 2.2rem;
    }
}

.portal-footer {
    margin-top: 3rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    z-index: 10;
    animation: fadeIn 1s ease-out 0.8s both;
}