:root {
    --bg-color: hsl(220, 25%, 10%);
    --panel-bg: hsl(220, 25%, 14%);
    --border-color: hsl(220, 20%, 22%);
    --text-primary: hsl(220, 10%, 90%);
    --text-secondary: hsl(220, 10%, 60%);
    --primary-color: hsl(150, 80%, 50%); /* 荧光绿 */
    --primary-glow: hsla(150, 80%, 50%, 0.25);
    --secondary-color: hsl(340, 95%, 60%); /* 霓虹粉 */
    --secondary-glow: hsla(340, 95%, 60%, 0.25);
    --danger-color: hsl(0, 85%, 60%);
    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Orbitron', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
}

.game-container {
    width: 100%;
    max-width: 720px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-family: var(--font-mono);
    font-weight: 900;
    font-size: 24px;
    letter-spacing: 2px;
}

.logo-link {
    color: var(--text-primary);
}

.logo-pong {
    color: var(--secondary-color);
    text-shadow: 0 0 10px var(--secondary-glow);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.stats {
    display: flex;
    gap: 16px;
}

.orientation-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    font-size: 10px;
    white-space: nowrap;
}

.orientation-icon {
    font-size: 14px;
    line-height: 1;
}

.orientation-toggle[aria-pressed="true"] {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.stat-box {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 16px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    min-width: 100px;
}

.stat-label {
    font-size: 9px;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

/* Main Panel */
.main-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .main-panel {
        grid-template-columns: 1fr 220px;
    }
}

/* Canvas Wrapper */
.canvas-wrapper {
    position: relative;
    aspect-ratio: 7/4;
    background: hsl(220, 25%, 8%);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    transition: aspect-ratio 0.2s ease;
}

/* 纵向模式：物理画布分辨率对调为 400x700，容器比例随之反转，
   并限制最大宽度以免在桌面端撑出超长纵向条 */
.canvas-wrapper.portrait {
    aspect-ratio: 4/7;
    max-width: 400px;
    max-height: 80vh;
    margin: 0 auto;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* Overlay Screen */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 12, 16, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    transition: opacity 0.3s ease;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 30px;
    width: 100%;
    max-width: 450px;
    animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.overlay-content.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.overlay-content h2 {
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 900;
    letter-spacing: 2px;
    margin-bottom: 4px;
}

.neon-text {
    color: var(--secondary-color);
    text-shadow: 0 0 15px var(--secondary-glow);
}

.tagline {
    color: var(--text-secondary);
    font-size: 13px;
}

.danger-text {
    color: var(--danger-color);
    text-shadow: 0 0 15px rgba(255, 75, 75, 0.3);
}

.final-score-text {
    font-family: var(--font-mono);
    font-size: 18px;
    color: var(--text-secondary);
}

.final-score-text span {
    color: var(--primary-color);
    font-size: 24px;
    font-weight: 700;
}

/* Room & Connection Info */
.room-info {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: left;
}

.room-info .label {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.invite-link-container {
    display: flex;
    gap: 8px;
    width: 100%;
}

.invite-link-container input {
    flex: 1;
    background: hsl(220, 25%, 5%);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 12px;
    font-family: inherit;
    outline: none;
    text-overflow: ellipsis;
    min-width: 0;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 10px;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Buttons */
.btn {
    font-family: var(--font-mono);
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 1px;
}

.btn:hover {
    border-color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.btn-secondary {
    background: hsl(220, 20%, 18%);
}

.btn-primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: hsl(220, 25%, 5%);
    padding: 14px 28px;
    font-size: 13px;
    box-shadow: 0 4px 15px var(--primary-glow);
    width: 100%;
}

.btn-primary:hover {
    background: hsl(150, 80%, 45%);
    border-color: hsl(150, 80%, 45%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Side Panel */
.side-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

@media (max-width: 767px) {
    .side-panel {
        display: none; /* 移动端隐藏侧边栏 */
    }
}

.panel-section {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
}

.panel-section h3 {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-secondary);
    letter-spacing: 1px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
}

.control-keys {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.key-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.note-row {
    font-size: 11px;
    font-style: italic;
    margin-top: 4px;
}

kbd {
    background: hsl(220, 20%, 20%);
    border: 1px solid var(--border-color);
    border-bottom: 2px solid hsl(220, 20%, 15%);
    border-radius: 4px;
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-primary);
}

.status-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 13px;
}

.status-online {
    color: var(--primary-color);
    font-weight: 600;
}

.status-offline {
    color: var(--danger-color);
    font-weight: 600;
}

/* Mobile Controls */
.mobile-controls {
    display: none;
    flex-direction: row;
    justify-content: center;
    gap: 16px;
    margin-top: 10px;
    width: 100%;
}

@media (max-width: 767px) {
    .mobile-controls {
        display: flex;
    }
}

.mkey {
    flex: 1;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    height: 54px;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 700;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    touch-action: manipulation;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.mkey:active {
    background: var(--border-color);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Footer Links */
.game-footer {
    display: flex;
    justify-content: center;
    padding: 10px 0;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: var(--text-primary);
}

.back-icon {
    transition: transform 0.2s ease;
}

.back-link:hover .back-icon {
    transform: translateX(-4px);
}