:root {
    --bg-color: #0f172a;
    --board-bg: rgba(255, 255, 255, 0.05);
    --grid-line: rgba(255, 255, 255, 0.1);
    --p1-color: #00f2ff;
    /* Cyan */
    --p1-glow: rgba(0, 242, 255, 0.6);
    --p2-color: #ff00ff;
    /* Magenta */
    --p2-glow: rgba(255, 0, 255, 0.6);
    --text-color: #e2e8f0;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --font-main: 'Outfit', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    /* Prevent selection during play */
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 10% 20%, rgba(0, 242, 255, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(255, 0, 255, 0.1) 0%, transparent 20%);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.app-container {
    width: 100%;
    max-width: 1200px;
    height: 95vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.game-header {
    text-align: center;
    margin-bottom: 20px;
    z-index: 20;
}

h1 {
    font-weight: 700;
    letter-spacing: 2px;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
    margin-bottom: 10px;
}

.turn-indicator {
    font-size: 1.2rem;
    font-weight: 500;
    padding: 8px 20px;
    background: var(--panel-bg);
    border-radius: 20px;
    border: var(--glass-border);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.game-arena {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    width: 100%;
    flex: 1;
    transition: filter 0.3s ease;
}

.blur-bg {
    filter: blur(10px);
    pointer-events: none;
}

/* Menu Overlay */
.menu-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.menu-box {
    background: rgba(15, 23, 42, 0.95);
    padding: 40px;
    border-radius: 20px;
    border: var(--glass-border);
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 400px;
    /* Fixed width */
    max-width: 90vw;
}

.menu-box h2 {
    margin-bottom: 20px;
    font-size: 1.8rem;
    background: linear-gradient(45deg, var(--p1-color), var(--p2-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.menu-btn {
    padding: 12px 20px;
    font-size: 1.1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: #fff;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-main);
}

.menu-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.menu-btn.small {
    padding: 8px 15px;
    font-size: 0.9rem;
}

.divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 10px 0;
}

.join-box {
    display: flex;
    gap: 10px;
}

#roomIdInput {
    flex: 1;
    padding: 8px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.3);
    color: #fff;
    font-family: var(--font-main);
}

/* ... existing h2 ... */

.input-error {
    border-color: #ff4444 !important;
    animation: shake 0.4s cubic-bezier(.36, .07, .19, .97) both;
}

@keyframes shake {

    10%,
    90% {
        transform: translate3d(-1px, 0, 0);
    }

    20%,
    80% {
        transform: translate3d(2px, 0, 0);
    }

    30%,
    50%,
    70% {
        transform: translate3d(-4px, 0, 0);
    }

    40%,
    60% {
        transform: translate3d(4px, 0, 0);
    }
}

.waiting-msg {
    margin-top: 10px;
    color: var(--p1-color);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0.6;
    }
}

/* Player Panels */
.player-panel {
    width: 250px;
    padding: 20px;
    background: var(--panel-bg);
    border-radius: 16px;
    border: var(--glass-border);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}



.player-panel.active {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.p1-panel.active {
    box-shadow: 0 0 20px var(--p1-glow);
    border-color: var(--p1-color);
}

.p2-panel.active {
    box-shadow: 0 0 20px var(--p2-glow);
    border-color: var(--p2-color);
}

.player-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.player-info h2 {
    font-size: 1.3rem;
    margin-bottom: 0;
}

.player-score {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: monospace;
}

.p1-panel h2 {
    color: var(--p1-color);
}

.p2-panel h2 {
    color: var(--p2-color);
}

.energy-bar {
    width: 100%;
    height: 24px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}

.energy-fill {
    height: 100%;
    width: 0%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.p1-panel .energy-fill {
    background: linear-gradient(90deg, var(--p1-color), #fff);
    box-shadow: 0 0 10px var(--p1-glow);
}

.p2-panel .energy-fill {
    background: linear-gradient(90deg, var(--p2-color), #fff);
    box-shadow: 0 0 10px var(--p2-glow);
}

.energy-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.8rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 2px #000;
}

/* Skills */
.skills-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.skill-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-main);
}

.skill-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.skill-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(1);
}

.skill-btn.active {
    background: rgba(255, 255, 255, 0.2);
    border-color: #fff;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.skill-icon {
    font-size: 1.2rem;
}

.skill-name {
    flex: 1;
    text-align: left;
    font-weight: 500;
}

.skill-cost {
    font-size: 0.8rem;
    opacity: 0.8;
}

/* Game Board */
.board-container {
    position: relative;
    padding: 20px;
    background: var(--panel-bg);
    border-radius: 20px;
    border: var(--glass-border);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    /* Reduced gap */
    width: fit-content;
    max-width: 95vw;
    /* Prevent overflow on mobile */
}

.game-board {
    display: grid;
    grid-template-columns: repeat(15, 1fr);
    grid-template-rows: repeat(15, 1fr);
    /* Responsive size: 70% of viewport min dimension, max 560px */
    width: min(560px, 70vmin);
    height: min(560px, 70vmin);
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    /* Dynamic grid size: 100% / 15 cells */
    background-size: calc(100% / 15) calc(100% / 15);
    background-position: center;
    border: 2px solid var(--grid-line);
}

/* Chat Bar */
.chat-bar {
    display: flex;
    gap: 8px;
    width: 100%;
    /* Match board width exactly */
    max-width: min(560px, 70vmin);
    padding: 6px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.chat-bar:focus-within {
    background: rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.chat-bar input {
    flex: 1;
    min-width: 0;
    /* Allow input to shrink below content size */
    padding: 10px 15px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
    font-family: var(--font-main);
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s ease;
}

.chat-bar input:focus {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.chat-bar input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.chat-bar button {
    padding: 10px 20px;
    border-radius: 10px;
    border: none;
    background: linear-gradient(135deg, var(--p1-color), var(--p2-color));
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    box-shadow: 0 4px 15px rgba(0, 242, 255, 0.2);
    white-space: nowrap;
    flex-shrink: 0;
}

.chat-bar button:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(255, 0, 255, 0.3);
    filter: brightness(1.1);
}

/* Last Move Highlight - Glow Effect */
/* Last Move Highlight - Player Specific Glow */
.cell.last-move .stone::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    z-index: -1;
}

.cell.last-move .stone.p1::before {
    box-shadow: 0 0 20px var(--p1-glow), inset 2px 2px 5px rgba(255, 255, 255, 0.5);
    animation: pulse-glow-p1 2s infinite;
}

.cell.last-move .stone.p2::before {
    box-shadow: 0 0 20px var(--p2-glow), inset 2px 2px 5px rgba(255, 255, 255, 0.5);
    animation: pulse-glow-p2 2s infinite;
}

@keyframes pulse-glow-p1 {
    0% {
        box-shadow: 0 0 15px var(--p1-glow);
        opacity: 0.8;
    }

    50% {
        box-shadow: 0 0 35px var(--p1-glow);
        opacity: 1;
    }

    100% {
        box-shadow: 0 0 15px var(--p1-glow);
        opacity: 0.8;
    }
}

@keyframes pulse-glow-p2 {
    0% {
        box-shadow: 0 0 15px var(--p2-glow);
        opacity: 0.8;
    }

    50% {
        box-shadow: 0 0 35px var(--p2-glow);
        opacity: 1;
    }

    100% {
        box-shadow: 0 0 15px var(--p2-glow);
        opacity: 0.8;
    }
}

/* Remove old highlight */
.cell.last-move::after {
    display: none;
}

.chat-bar button:active {
    transform: translateY(1px);
}

.cell {
    width: 100%;
    height: 100%;
    position: relative;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cell:hover::after {
    content: '';
    width: 30%;
    height: 30%;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
}

.stone {
    width: 80%;
    height: 80%;
    border-radius: 50%;
    position: relative;
    animation: placeStone 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.stone.p1 {
    background: var(--p1-color);
    box-shadow: 0 0 15px var(--p1-glow), inset 2px 2px 5px rgba(255, 255, 255, 0.5);
}

.stone.p2 {
    background: var(--p2-color);
    box-shadow: 0 0 15px var(--p2-glow), inset 2px 2px 5px rgba(255, 255, 255, 0.5);
}

@keyframes placeStone {
    from {
        transform: scale(0);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Stats Widget */
.stats-widget {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    gap: 15px;
    z-index: 100;
}

.stat-item {
    background: rgba(30, 41, 59, 0.8);
    padding: 10px 15px;
    border-radius: 20px;
    border: var(--glass-border);
    backdrop-filter: blur(10px);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.stat-item:hover {
    transform: translateY(-2px);
    background: rgba(30, 41, 59, 0.95);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: rgba(15, 23, 42, 0.95);
    padding: 30px;
    border-radius: 20px;
    border: var(--glass-border);
    width: 60%;
    /* Widen to 60% */
    max-width: 90%;
    text-align: center;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
}

.modal-content h3 {
    margin-bottom: 20px;
    font-size: 1.5rem;
    color: var(--p1-color);
}

.close-btn {
    margin-top: 20px;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    border-radius: 8px;
    cursor: pointer;
}

/* Timer Display */
.timer-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
    margin-bottom: 10px;
    text-align: center;
    font-family: monospace;
}

.timer-display.warning {
    color: #ff4444;
    animation: pulse 0.5s infinite;
}

/* Room ID Badge */
.room-id-badge {
    margin-top: 15px;
    background: rgba(255, 255, 255, 0.1);
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.2s;
}

.room-id-badge:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--p1-color);
}

#roomIdDisplay {
    font-family: monospace;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--p1-color);
    letter-spacing: 2px;
}

.copy-hint {
    font-size: 0.8rem;
    opacity: 0.6;
}

/* Win Overlay Optimization */
.win-overlay {
    background: rgba(15, 23, 42, 0.4);
    /* High transparency */
    width: 80%;
    max-width: 400px;
    height: auto;
    padding: 30px;
    position: fixed;
    /* Use fixed to center on screen */
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(3px);
    /* Reduced blur */
    z-index: 1000;
    /* High z-index */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 20px;
}

.win-overlay:not(.hidden) {
    opacity: 1;
    pointer-events: all;
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    from {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0;
    }

    to {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
}

/* Last Move Highlight */
.last-move {
    box-shadow: 0 0 15px 2px #fff, inset 0 0 10px rgba(255, 255, 255, 0.5);
    z-index: 5;
}

/* Destroyed Marker (Empty Circle) */
.destroyed-marker {
    position: relative;
}

.destroyed-marker::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 60%;
    height: 60%;
    transform: translate(-50%, -50%);
    border: 2px dashed rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
}

.win-overlay h2 {
    font-size: 3rem;
    margin-bottom: 30px;
    background: linear-gradient(45deg, var(--p1-color), var(--p2-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.restart-btn {
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(45deg, #4f46e5, #ec4899);
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: transform 0.2s;
}

.restart-btn:hover {
    transform: scale(1.1);
}

.hidden {
    display: none;
}

/* Nickname Input */
.nickname-input {
    width: 100%;
    padding: 12px;
    margin-bottom: 10px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.3);
    color: #fff;
    font-family: var(--font-main);
    text-align: center;
    font-size: 1rem;
}

/* Danmaku */
.danmaku-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 50;
}

.danmaku-item {
    position: absolute;
    white-space: nowrap;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 5px #000;
    animation: fly 8s linear forwards;
    opacity: 0.9;
}

@keyframes fly {
    from {
        transform: translateX(100vw);
    }

    to {
        transform: translateX(-100%);
    }
}

/* GitHub Footer */
.github-footer {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    transition: opacity 0.3s;
}

.game-active .github-footer {
    display: none;
}

.github-footer a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    background: rgba(30, 41, 59, 0.8);
    border: var(--glass-border);
    border-radius: 30px;
    color: var(--text-color);
    text-decoration: none;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    font-weight: 500;
}

.github-footer a:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    color: #fff;
}

.player-score {
    font-size: 1.5rem;
    font-weight: 800;
    margin-left: auto;
    /* Push to right */
    font-family: monospace;
    color: #fff;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

/* Rules Modal */
.rules-content {
    width: 600px;
    max-width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    text-align: left;
}

.rules-body {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-top: 20px;
}

.rule-section {
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.rule-section h4 {
    color: var(--p1-color);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.rule-section p {
    margin-bottom: 15px;
    line-height: 1.5;
    opacity: 0.9;
}

.rule-section img {
    width: 100%;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive Adjustments */
@media (max-width: 1000px) {
    .game-arena {
        gap: 20px;
    }

    .player-panel {
        width: 200px;
        padding: 15px;
    }

    .player-info h2 {
        font-size: 1.2rem;
    }
}

@media (max-width: 800px) {
    .app-container {
        height: 100vh;
        padding: 10px;
    }

    .game-header {
        margin-bottom: 10px;
    }

    h1 {
        font-size: 1.5rem;
    }

    .game-arena {
        flex-direction: column;
        gap: 10px;
        justify-content: flex-start;
        overflow-y: auto;
    }

    .board-container {
        order: 2;
        /* Board in middle */
        padding: 10px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    }

    .game-board {
        /* Larger board on mobile relative to width */
        width: min(90vw, 50vh);
        height: min(90vw, 50vh);
    }

    .chat-bar {
        max-width: min(90vw, 50vh);
    }

    .player-panel {
        width: 100%;
        max-width: 400px;
        flex-direction: row;
        align-items: center;
        padding: 10px 15px;
        gap: 15px;
        min-height: auto;
    }

    .p1-panel {
        order: 1;
        /* P1 on top */
    }

    .p2-panel {
        order: 3;
        /* P2 on bottom */
    }

    .player-info {
        flex: 1;
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .player-info h2 {
        margin: 0;
        font-size: 1rem;
    }

    .energy-bar {
        width: 80px;
        height: 10px;
    }

    .energy-text {
        font-size: 0.7rem;
    }

    .skills-container {
        flex-direction: row;
        gap: 5px;
    }

    .skill-btn {
        padding: 6px;
    }

    .skill-name,
    .skill-cost {
        display: none;
        /* Icon only on mobile */
    }

    .skill-icon {
        font-size: 1rem;
    }
}

/* Error Pulse Animation */
@keyframes error-pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 0, 0, 0.7);
    }

    70% {
        box-shadow: 0 0 0 10px rgba(255, 0, 0, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(255, 0, 0, 0);
    }
}

.cell.error-pulse {
    animation: error-pulse 0.5s;
}

/* Fix Destroyed Marker Hover - Ensure it stays centered and doesn't scale */
.destroyed-marker:hover::after {
    transform: translate(-50%, -50%) !important;
    /* Keep centered, no scale */
    border-color: #ff4444;
    background: rgba(255, 68, 68, 0.1);
    width: 60% !important;
    /* Ensure size stays constant */
    height: 60% !important;
}