html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background-color: #1a1a2e;
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: white;
}

/* Disable all text selection and touch callouts */
html, body, body * {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

* {
    box-sizing: border-box;
}

#game-canvas {
    display: block;
    width: 100vw;
    height: 100vh;
    touch-action: none;
}

/* ==================== Player HUD (inside right panel) ==================== */
.hud-player {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 6px 10px;
    border-radius: 10px;
    transition: all 0.3s;
    opacity: 0.5;
    white-space: nowrap;
}

.hud-player.active {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.15);
}

.hud-icon {
    font-size: 18px;
}

.hud-name {
    font-weight: bold;
    font-size: 12px;
}

.hud-arrows {
    font-size: 10px;
    opacity: 0.8;
}

.panel-divider {
    width: 100%;
    height: 1px;
    background: rgba(255, 255, 255, 0.12);
    margin: 2px 0;
}

/* ==================== Right Panel (Arrows) ==================== */
#right-panel {
    position: fixed;
    top: 50%;
    right: 0;
    transform: translateX(100%) translateY(-50%);
    z-index: 60;
    pointer-events: none;
}

#right-panel.enable-transition {
    transition: transform 0.3s ease;
}

#right-panel.open {
    transform: translateX(0) translateY(-50%);
}

#right-panel-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px 14px;
    padding-right: calc(14px + env(safe-area-inset-right, 0px));
    background: rgba(0, 0, 0, 0.8);
    border-radius: 14px 0 0 14px;
    pointer-events: auto;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* Arrow tiles tray — 2x2 grid inside right panel */
#right-panel-content #arrow-tiles-tray {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
}

/* Toggle handle (left side of right panel) */
#right-panel-toggle {
    position: absolute;
    left: -26px;
    top: 50%;
    transform: translateY(-50%);
    width: 26px;
    height: 56px;
    background: rgba(0, 0, 0, 0.8);
    border: none;
    border-radius: 8px 0 0 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    pointer-events: auto;
    touch-action: manipulation;
    transition: background 0.2s;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

#right-panel-toggle::after {
    content: '◀';
}

#right-panel.open #right-panel-toggle::after {
    content: '▶';
}

/* When panel is closed, extend toggle to cover safe area inset */
#right-panel:not(.open) #right-panel-toggle {
    left: calc(-26px - env(safe-area-inset-right, 0px));
    width: calc(26px + env(safe-area-inset-right, 0px));
    justify-content: flex-start;
    padding-left: 6px;
}

.arrow-tile-draggable {
    width: 44px;
    height: 44px;
    border: 2px solid rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.08);
    color: white;
    border-radius: 10px;
    cursor: grab;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    pointer-events: auto;
    touch-action: none;
}


.arrow-tile-draggable:active {
    cursor: grabbing;
}

.arrow-tile-draggable.dragging {
    opacity: 0.35;
    transform: scale(0.9);
}

.arrow-tile-draggable.disabled {
    opacity: 0.25;
    cursor: not-allowed;
    pointer-events: none;
}


/* Drag preview (follows pointer) */
#drag-preview {
    display: none;
    position: fixed;
    width: 52px;
    height: 52px;
    border-radius: 12px;
    font-size: 26px;
    z-index: 300;
    pointer-events: none;
    transform: translate(-50%, -50%);
    display: none;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}

#drag-preview.visible {
    display: flex;
}

#drag-preview.can-place {
    background: rgba(46, 204, 113, 0.5);
    border-color: rgba(46, 204, 113, 0.8);
    box-shadow: 0 4px 20px rgba(46, 204, 113, 0.4);
}

#drag-preview.cannot-place {
    background: rgba(231, 76, 60, 0.5);
    border-color: rgba(231, 76, 60, 0.8);
    box-shadow: 0 4px 20px rgba(231, 76, 60, 0.4);
}

#drag-preview.neutral {
    background: rgba(108, 92, 231, 0.45);
    border-color: rgba(108, 92, 231, 0.7);
    box-shadow: 0 4px 20px rgba(108, 92, 231, 0.3);
}

/* ==================== Left Panel ==================== */

/* Calculation indicator on HUD (AI + Assist) */
.hud-player.ai-thinking .hud-icon,
.hud-player.calculating .hud-icon {
    animation: ai-pulse 0.8s ease-in-out infinite;
}

@keyframes ai-pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

#left-panel {
    position: fixed;
    top: 50%;
    left: 0;
    transform: translateX(-100%) translateY(-50%);
    z-index: 60;
    pointer-events: none;
}

#left-panel.enable-transition {
    transition: transform 0.3s ease;
}

#left-panel.open {
    transform: translateX(0) translateY(-50%);
}

#left-panel-content {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 12px 14px;
    padding-left: calc(14px + env(safe-area-inset-left, 0px));
    background: rgba(0, 0, 0, 0.8);
    border-radius: 0 14px 14px 0;
    pointer-events: auto;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

#left-panel-content button {
    background: rgba(255, 255, 255, 0.08);
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 13px;
    text-align: left;
    white-space: nowrap;
    min-width: 120px;
    transition: background 0.2s;
    pointer-events: auto;
    touch-action: manipulation;
}

#left-panel-content button.active {
    background: rgba(108, 92, 231, 0.5);
}

#left-panel-content button#btn-view.active {
    background: rgba(52, 152, 219, 0.62);
}

#left-panel-content button#btn-ai.active {
    background: rgba(46, 204, 113, 0.62);
}

#left-panel-content button#btn-assist.active {
    background: rgba(26, 188, 156, 0.62);
}

#left-panel-content button#btn-undo.active {
    background: rgba(231, 76, 60, 0.62);
}

#left-panel-content button#btn-restart.active {
    background: rgba(243, 156, 18, 0.62);
}

#left-panel-content button#btn-rules.active {
    background: rgba(155, 89, 182, 0.62);
}

#left-panel-content button:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

/* Toggle handle */
#left-panel-toggle {
    position: absolute;
    right: -26px;
    top: 50%;
    transform: translateY(-50%);
    width: 26px;
    height: 56px;
    background: rgba(0, 0, 0, 0.8);
    border: none;
    border-radius: 0 8px 8px 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    pointer-events: auto;
    touch-action: manipulation;
    transition: background 0.2s;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}


#left-panel-toggle::after {
    content: '▶';
}

#left-panel.open #left-panel-toggle::after {
    content: '◀';
}

/* When panel is closed, extend toggle to cover safe area inset */
#left-panel:not(.open) #left-panel-toggle {
    right: calc(-26px - env(safe-area-inset-left, 0px));
    width: calc(26px + env(safe-area-inset-left, 0px));
    padding-right: 0;
    justify-content: flex-end;
    padding-right: 6px;
}

/* ==================== Modals ==================== */
.modal {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 200;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: linear-gradient(135deg, #1a1a2e 0%, #2d3436 100%);
    padding: 36px;
    border-radius: 20px;
    text-align: center;
    color: white;
    border: 2px solid #6c5ce7;
    position: relative;
    max-width: 460px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-rules {
    max-width: 540px;
    text-align: left;
}

.modal-rules h1 {
    text-align: center;
    margin-bottom: 16px;
    color: #6c5ce7;
}

.rules-body {
    font-size: 14px;
    line-height: 1.8;
}

.rules-body hr {
    border: none;
    border-top: 1px solid rgba(255,255,255,0.15);
    margin: 12px 0;
}

.rules-body ul {
    padding-left: 20px;
    margin: 8px 0;
}

.rules-body li {
    margin-bottom: 4px;
}

.modal-close-btn {
    position: absolute;
    top: 10px; right: 10px;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: none;
    width: 36px; height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    transition: background 0.3s;
    pointer-events: auto;
}


.modal-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 24px;
}

.btn-p1 {
    background: #e63939;
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.2s;
}


.btn-p2 {
    background: #1aab9d;
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.2s;
}


.btn-play {
    display: block;
    margin: 20px auto 0;
    background: #6c5ce7;
    color: white;
    border: none;
    padding: 14px 40px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
    transition: all 0.2s;
}


/* ==================== Responsive ==================== */
@media (max-width: 600px) {
    .arrow-tile-draggable {
        width: 38px;
        height: 38px;
        font-size: 17px;
    }

    #drag-preview.visible {
        width: 46px;
        height: 46px;
        font-size: 22px;
    }

    #left-panel-content button {
        padding: 8px 12px;
        font-size: 12px;
    }

    #left-panel-content {
        padding: 10px 10px;
        padding-left: calc(10px + env(safe-area-inset-left, 0px));
    }

    #right-panel-content {
        padding: 10px 10px;
        padding-right: calc(10px + env(safe-area-inset-right, 0px));
    }

    .hud-player {
        padding: 4px 6px;
    }

    .hud-name {
        font-size: 10px;
    }

    .hud-arrows {
        font-size: 9px;
    }

    .hud-icon {
        font-size: 14px;
    }
}

/* Portrait mobile: panel at bottom, horizontal layout */
@media (max-width: 600px) and (orientation: portrait) {
    #right-panel {
        top: auto;
        right: auto;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%) translateY(100%);
    }

    #right-panel.open {
        transform: translateX(-50%) translateY(0);
    }

    #right-panel-content {
        flex-direction: row;
        align-items: center;
        border-radius: 14px 14px 0 0;
        padding: 8px 12px;
        padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
        padding-right: 12px;
        gap: 6px;
    }

    /* Arrows in 1x4 row at bottom */
    #right-panel-content #arrow-tiles-tray {
        display: flex;
        flex-direction: row;
        gap: 4px;
    }

    .panel-divider {
        width: 1px;
        height: 36px;
        margin: 0 2px;
    }

    /* Toggle on top of bottom panel */
    #right-panel-toggle {
        left: 50%;
        top: -26px;
        bottom: auto;
        transform: translateX(-50%);
        width: 56px;
        height: 26px;
        border-radius: 8px 8px 0 0;
    }

    #right-panel-toggle::after {
        content: '▲';
    }

    #right-panel.open #right-panel-toggle::after {
        content: '▼';
    }

    #right-panel:not(.open) #right-panel-toggle {
        left: 50%;
        top: calc(-26px - env(safe-area-inset-bottom, 0px));
        width: 56px;
        height: calc(26px + env(safe-area-inset-bottom, 0px));
        padding-left: 0;
        justify-content: center;
        align-items: flex-start;
        padding-top: 6px;
    }
}

/* Landscape mobile: panel on the right */
@media (max-width: 900px) and (orientation: landscape) {
    #right-panel-content {
        padding: 10px 10px;
        padding-right: calc(10px + env(safe-area-inset-right, 0px));
    }
}