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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 20px;
    position: relative;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 10px;
}

.home-btn {
    position: absolute;
    top: 0;
    right: 0;
    padding: 8px 14px;
    font-size: 14px;
    border: 1px solid #bdc3c7;
    border-radius: 6px;
    background: white;
    color: #7f8c8d;
    cursor: pointer;
    z-index: 10;
}

.home-btn:hover {
    border-color: #3498db;
    color: #3498db;
}

/* Language toggle (fixed, visible on all screens) */
.lang-toggle {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 1001;
    padding: 6px 10px;
    font-size: 12px;
    border-radius: 6px;
    border: 1px solid #bdc3c7;
    background: white;
    color: #7f8c8d;
    cursor: pointer;
}

.lang-toggle:hover {
    border-color: #3498db;
    color: #3498db;
}

/* Loading overlay (shown during init, room fetch, create room, start game) */
.app-loading {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(255, 255, 255, 0.92);
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 1rem;
}

.app-loading.visible {
    display: flex;
}

.app-loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #ecf0f1;
    border-top-color: #3498db;
    border-radius: 50%;
    animation: app-loading-spin 0.8s linear infinite;
}

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

.app-loading-text {
    font-size: 1rem;
    color: #7f8c8d;
}

.header.has-lobby-bar .home-btn {
    top: 60px;
}

.header p,
.header .header-desc {
    color: #7f8c8d;
    font-size: 1.1rem;
}

.mode-toggle {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 12px;
}

.mode-btn {
    padding: 8px 16px;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    background: white;
    color: #7f8c8d;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-btn:hover {
    border-color: #3498db;
    color: #3498db;
}

.mode-btn.active {
    background: #3498db;
    border-color: #3498db;
    color: white;
}

.version-badge {
    display: inline-block;
    font-size: 0.5em;
    font-weight: 600;
    color: #27ae60;
    background: #d5f4e6;
    padding: 2px 8px;
    border-radius: 6px;
    vertical-align: middle;
    margin-left: 6px;
}

.game-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding: 15px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: relative;
}

.game-stats {
    display: flex;
    gap: 15px;
    align-items: center;
}

.timer-display, .score-display {
    font-size: 14px;
    font-weight: 600;
    color: #2c3e50;
}

.score-display {
    color: #27ae60;
}

.mistakes {
    display: flex;
    gap: 5px;
}

.mistake-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #ecf0f1;
    border: 2px solid #bdc3c7;
}

.mistake-dot.used {
    background-color: #e74c3c;
    border-color: #c0392b;
}

.game-controls {
    display: flex;
    gap: 10px;
}

.dictionary-btn, .guide-btn, .hints-toggle-btn, .category-hints-toggle-btn, .leaderboard-btn {
    background: #3498db;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.dictionary-btn:hover, .guide-btn:hover, .hints-toggle-btn:hover, .category-hints-toggle-btn:hover, .leaderboard-btn:hover {
    background: #2980b9;
}

.category-hints-toggle-btn:disabled {
    background: #95a5a6;
    cursor: not-allowed;
}

.round-display {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 12px;
    padding: 8px;
    background: #e8f4fc;
    border-radius: 6px;
}

.game-main {
    display: flex;
    gap: 30px;
    align-items: stretch;
}

.game-left {
    flex: 3.6;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.game-right {
    flex: 2.4;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 0;
    flex-shrink: 0;
}

.concept-card {
    background: white;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    padding: 22px 18px;
    text-align: center;
    cursor: pointer;
    font-weight: 500;
    font-size: 17px;
    transition: all 0.2s ease;
    user-select: none;
    min-height: 105px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: center;
    justify-content: center;
    line-height: 1.3;
    position: relative;
    z-index: 2;
}

.concept-card[data-hint]::after {
    content: attr(data-hint);
    font-size: 11px;
    color: #7f8c8d;
    margin-top: 4px;
}

.concept-card.correct[data-hint]::after {
    color: #27ae60;
}

.concept-card:hover {
    border-color: #3498db;
    transform: translateY(-1px);
}

.concept-card.selected {
    border-color: #3498db;
    background-color: #ebf5fb;
}

.concept-card.correct {
    border-color: #27ae60;
    background-color: #d5f4e6;
    color: #27ae60;
}

.concept-card.incorrect {
    border-color: #e74c3c;
    background-color: #fadbd8;
    color: #e74c3c;
}

.concept-card.incorrect.selected {
    border-color: #3498db;
    background-color: #ebf5fb;
    color: #333;
    border-width: 3px;
}

.concept-card.incorrect-fading,
.concept-card.incorrect.incorrect-fading {
    transition: background-color 0.4s ease, border-color 0.4s ease, color 0.4s ease;
    background-color: white;
    border-color: #bdc3c7;
    color: #333;
}

/* Tooltip Styles */
.concept-tooltip {
    position: absolute;
    background: #2c3e50;
    color: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    z-index: 1000;
    max-width: 280px;
    font-size: 14px;
    line-height: 1.4;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.concept-tooltip.show {
    opacity: 1;
}

.concept-tooltip.sticky {
    pointer-events: auto;
}

.tooltip-title {
    font-weight: bold;
    margin-bottom: 8px;
    font-size: 16px;
    color: #3498db;
}

.tooltip-definition {
    margin-bottom: 10px;
    color: #ecf0f1;
}

.category-slots {
    display: grid;
    gap: 15px;
    margin-bottom: 30px;
}

.category-slots.slots-3 {
    grid-template-columns: repeat(3, 1fr);
}

.category-slots.slots-4 {
    grid-template-columns: repeat(2, 1fr);
}

.category-slot.hidden {
    display: none;
}

.category-slot {
    background: white;
    border: 2px dashed #bdc3c7;
    border-radius: 8px;
    padding: 22px;
    min-height: 115px;
}

.category-slot.filled {
    border-style: solid;
    border-color: #27ae60;
    background-color: #d5f4e6;
}

.category-name {
    font-weight: 600;
    font-size: 17px;
    color: #2c3e50;
}

.category-concepts {
    font-size: 12px;
    color: #7f8c8d;
    margin-top: 5px;
}

.controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-shrink: 0;
    margin-top: auto;
}

.submit-btn, .deselect-btn, .new-game-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.submit-btn {
    background: #27ae60;
    color: white;
}

.submit-btn:hover:not(:disabled) {
    background: #219a52;
}

.submit-btn:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
}

.deselect-btn {
    background: #e67e22;
    color: white;
}

.deselect-btn:hover {
    background: #d35400;
}

.new-game-btn {
    background: #3498db;
    color: white;
}

.new-game-btn:hover {
    background: #2980b9;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    z-index: 1001;
}

.modal h2 {
    margin-bottom: 15px;
    color: #2c3e50;
}

.modal p {
    margin-bottom: 20px;
    color: #7f8c8d;
}

#room-name-modal label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
}

.room-name-input {
    display: block;
    width: 100%;
    max-width: 280px;
    padding: 10px 12px;
    margin-bottom: 16px;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    font-size: 16px;
}

.room-name-input:focus {
    outline: none;
    border-color: #3498db;
}

.solution-category {
    margin: 15px 0;
    padding: 15px;
    border-radius: 6px;
    text-align: left;
}

.solution-category.easy { background: #fef9e7; border-left: 4px solid #f1c40f; }
.solution-category.medium { background: #e8f4fd; border-left: 4px solid #3498db; }
.solution-category.hard { background: #f4ecf7; border-left: 4px solid #9b59b6; }
.solution-category.harder { background: #fdeaea; border-left: 4px solid #e74c3c; }

.difficulty-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 5px;
}

.easy-badge { background: #f1c40f; color: white; }
.medium-badge { background: #3498db; color: white; }
.hard-badge { background: #9b59b6; color: white; }
.harder-badge { background: #e74c3c; color: white; }

.concept-list {
    text-align: left;
    max-height: 400px;
    overflow-y: auto;
}

.concept-item {
    margin: 10px 0;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 6px;
    border-left: 4px solid #3498db;
}

.concept-name {
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 5px;
}

.concept-description {
    font-size: 14px;
    color: #7f8c8d;
    line-height: 1.4;
}

.win-stats {
    font-weight: 600;
    color: #27ae60;
    margin-bottom: 8px;
}

.win-name-prompt {
    margin: 15px 0;
}

.win-name-prompt label {
    display: block;
    margin-bottom: 5px;
    font-size: 14px;
    color: #7f8c8d;
}

.win-name-prompt input {
    width: 100%;
    max-width: 200px;
    padding: 8px 12px;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    font-size: 14px;
}

.leaderboard-hint {
    font-size: 12px;
    color: #95a5a6;
    margin-bottom: 15px;
}

.leaderboard-list {
    max-height: 300px;
    overflow-y: auto;
    text-align: left;
    margin-bottom: 20px;
}

.leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    margin-bottom: 6px;
    background: #f8f9fa;
    border-radius: 6px;
    border-left: 4px solid #3498db;
}

.leaderboard-item.rank-1 { border-left-color: #f1c40f; }
.leaderboard-item.rank-2 { border-left-color: #bdc3c7; }
.leaderboard-item.rank-3 { border-left-color: #cd7f32; }

.guide-content {
    text-align: left;
    line-height: 1.6;
}

.guide-section {
    margin-bottom: 20px;
}

.guide-section h3 {
    color: #2c3e50;
    margin-bottom: 10px;
}

.guide-section ul {
    padding-left: 20px;
}

.guide-section li {
    margin-bottom: 8px;
}

/* Mobile / tablet: keep 4×4 grid like Connections, compact tiles */
@media (max-width: 900px) {
    .container {
        padding: 10px;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .game-board {
        grid-template-columns: repeat(4, 1fr);
        gap: 6px;
        margin-bottom: 0;
    }

    .concept-card {
        min-height: 52px;
        padding: 8px 4px;
        font-size: 11px;
        line-height: 1.2;
    }

    .category-slots {
        grid-template-columns: 1fr;
    }

    .category-slots.slots-4 {
        grid-template-columns: 1fr;
    }

    .game-main {
        flex-direction: column;
    }

    .controls {
        flex-direction: column;
    }

    .game-controls {
        flex-wrap: wrap;
        justify-content: center;
    }

    .game-stats {
        width: 100%;
        justify-content: center;
    }

    /* Welcome layout: stack vertically on phones */
    .welcome-layout {
        flex-direction: column;
        gap: 16px;
    }

    .welcome-left,
    .welcome-right {
        width: 100%;
        flex: none;
    }

    /* Mode block wider on phones */
    .welcome-settings {
        width: 100%;
    }

    /* On phones: put link box between header and mode/solo/room */
    .welcome-card > .welcome-layout {
        order: 2;
    }

    .welcome-card > .welcome-join {
        order: 1;
    }

    .welcome-card {
        padding: 20px;
    }

    .concept-tooltip {
        max-width: min(280px, 90vw);
        font-size: 13px;
        padding: 12px;
    }

    .concept-tooltip.show {
        /* On touch, position below card so it's visible */
        max-height: 40vh;
        overflow-y: auto;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 8px;
    }

    .concept-card {
        min-height: 48px;
        font-size: 10px;
    }
}

/* Phone / tablet layout for in-game controls and categories */
@media (max-width: 900px) {
    /* Submit / deselect / new-game in a row under the tiles */
    .game-main {
        flex-direction: column;
    }

    .game-left,
    .game-right {
        width: 100%;
    }

    .controls {
        display: flex;
        flex-direction: row;
        justify-content: center;
        gap: 8px;
        margin-top: 0;
    }

    .controls button {
        flex: 1 1 0;
        white-space: nowrap;
    }

    /* Categories: two per row, two rows */
    .category-slots {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
        margin-top: 16px;
    }

    .category-slots.slots-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* FINAL mobile layout overrides (ensure these win by placing at end) */
@media (max-width: 900px) {
    /* Landing page: make card a simple vertical stack and full-width */
    .welcome-card {
        display: flex;
        flex-direction: column;
        gap: 16px;
        padding: 20px;
        max-width: 100%;
        width: 100%;
    }

    /* Order: header/desc (default), then link box, then mode + solo/room */
    .welcome-card > .welcome-join {
        order: 1;
    }

    .welcome-card > .welcome-layout {
        order: 2;
    }

    /* On phones: stack mode and solo/room vertically, full-width */
    .welcome-layout {
        flex-direction: column;
        align-items: stretch;
    }

    .welcome-left,
    .welcome-right {
        flex: none;
        width: 100%;
    }
}

/* Welcome screen */
.welcome-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(160deg, #f5f5f5 0%, #e8eef2 100%);
}

.welcome-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    padding: 32px;
    max-width: 900px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.welcome-card h1 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 8px;
    text-align: center;
}

.welcome-desc {
    color: #7f8c8d;
    font-size: 1rem;
    margin-bottom: 18px;
    text-align: center;
}

/* Landing page main layout (desktop): mode on the left, solo/room on the right */
.welcome-layout {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    margin-top: 20px;
}

.welcome-left {
    flex: 1.1;
}

.welcome-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Phone layout JUST for the landing card and its contents.
   This block is after the desktop rules so it wins on small screens. */
@media (max-width: 900px) {
    .welcome-card {
        max-width: 100% !important;
        width: 100% !important;
        padding: 20px;
    }

    .welcome-layout {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .welcome-left,
    .welcome-right {
        flex: none;
        width: 100%;
    }
}

/* Unified settings card on landing page (left side) */
.welcome-settings {
    border: 1px solid #ecf0f1;
    border-radius: 10px;
    padding: 16px 18px;
    background: #fafafa;
}

.welcome-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin-top: 8px;
}

.welcome-lobby-controls {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 260px;
}

.welcome-rounds-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Visual divide between Solo and Room actions */
.welcome-actions-divider {
    width: 1px;
    align-self: stretch;
    background: #ecf0f1;
    margin: 0 10px;
}

.welcome-actions > .welcome-solo {
    flex: 0 0 auto;
}

.welcome-actions > .welcome-lobby-controls {
    flex: 1 1 auto;
}

.welcome-actions-panel {
    border: 1px solid #ecf0f1;
    border-radius: 10px;
    padding: 12px 14px;
    background: #fafafa;
}

.welcome-actions-panel label {
    font-size: 13px;
    color: #7f8c8d;
}

.welcome-actions-panel .welcome-btn {
    width: 100%;
}

.welcome-panel-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #2c3e50;
    margin: 0 0 8px 0;
}

/* Box around pasted JSON & file controls */
.templates-box {
    border: 1px solid #e0e4e8;
    border-radius: 8px;
    padding: 10px;
    background: #ffffff;
}

.templates-textarea {
    width: 100%;
    margin-top: 6px;
    min-height: 80px;
    max-height: 200px;
    resize: vertical;
    border-radius: 6px;
    border: 1px solid #bdc3c7;
    padding: 8px;
    font-family: monospace;
    font-size: 12px;
}

.templates-apply-btn {
    margin-top: 6px;
}

.welcome-solo-section h3, .welcome-lobby-section h3 {
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 12px;
    margin-top: 0;
}

.welcome-option-group {
    margin-bottom: 14px;
}

.welcome-option-group label {
    display: block;
    font-size: 13px;
    color: #7f8c8d;
    margin-bottom: 6px;
    font-weight: 500;
}

.welcome-mode-toggle {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.welcome-mode-btn {
    padding: 8px 14px;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    background: white;
    color: #7f8c8d;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.welcome-mode-btn:hover {
    border-color: #3498db;
    color: #3498db;
}

.welcome-mode-btn.active {
    background: #3498db;
    border-color: #3498db;
    color: white;
}

.welcome-file-btn {
    padding: 6px 12px;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
    background: white;
    color: #7f8c8d;
    font-size: 13px;
    cursor: pointer;
}

.welcome-file-btn:hover {
    border-color: #3498db;
    color: #3498db;
}

.welcome-file-name {
    font-size: 12px;
    color: #27ae60;
    margin-left: 8px;
}

.welcome-rounds-slider {
    width: 100%;
    max-width: 200px;
    margin-right: 10px;
}

.welcome-rounds-value {
    font-weight: 600;
    color: #2c3e50;
    font-size: 14px;
}

.welcome-btn {
    padding: 14px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
}

.welcome-solo {
    background: #27ae60;
    color: white;
    border-color: #219a52;
}

.welcome-solo:hover {
    background: #219a52;
}

.welcome-lobby-create {
    background: #27ae60;
    color: white;
    border-color: #219a52;
    width: 100%;
}

.welcome-lobby-create:hover {
    background: #219a52;
}

.welcome-join {
    border-top: 1px solid #ecf0f1;
    padding-top: 20px;
}

.welcome-join label {
    display: block;
    font-size: 14px;
    color: #7f8c8d;
    margin-bottom: 8px;
}

.welcome-join-row {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.welcome-join-row input {
    flex: 1;
    padding: 10px 12px;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    font-size: 14px;
}

.welcome-join-row input:focus {
    outline: none;
    border-color: #3498db;
}

.welcome-join-btn {
    padding: 10px 18px;
    background: #95a5a6;
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
}

.welcome-join-btn:hover {
    background: #7f8c8d;
}

.welcome-hint {
    font-size: 12px;
    color: #95a5a6;
    margin: 0;
}

/* Lobby bar (visible in room mode) */
.lobby-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    margin-bottom: 12px;
    background: #e8f4fc;
    border-radius: 8px;
    padding: 12px 16px;
    position: relative;
}

.lobby-label {
    font-size: 14px;
    font-weight: 600;
    color: #2c3e50;
}

.lobby-link {
    flex: 1;
    min-width: 120px;
    padding: 6px 10px;
    font-size: 13px;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
    background: #fff;
}

.lobby-copy-btn, .lobby-leaderboard-btn, .lobby-download-btn {
    padding: 6px 12px;
    font-size: 13px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    border: 1px solid #3498db;
    background: #3498db;
    color: white;
}

.lobby-copy-btn:hover, .lobby-leaderboard-btn:hover, .lobby-download-btn:hover {
    background: #2980b9;
}

.leaderboard-actions {
    display: flex;
    gap: 10px;
    margin-top: 16px;
    flex-wrap: wrap;
}

/* Connections Research Lab skin */
:root {
    --lab-bg: #fbfbf8;
    --lab-ink: #151515;
    --lab-muted: #6f7378;
    --lab-line: #d8d8d0;
    --lab-panel: #ffffff;
    --lab-soft: #f3f3ee;
    --lab-primary: #171717;
    --lab-blue: #246b9f;
    --lab-green: #25784f;
    --lab-amber: #b4761f;
    --lab-red: #b4483f;
    --lab-shadow: 0 10px 30px rgba(22, 22, 18, 0.08);
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background:
        radial-gradient(circle at 1px 1px, rgba(21, 21, 21, 0.11) 1px, transparent 0),
        var(--lab-bg);
    background-size: 24px 24px;
    color: var(--lab-ink);
}

.container {
    max-width: 1280px;
    padding: 24px;
}

.header {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px 20px;
    align-items: start;
    text-align: left;
    border-bottom: 2px solid var(--lab-primary);
    padding-bottom: 18px;
}

.header h1,
.welcome-card h1 {
    font-family: "Playfair Display", Georgia, serif;
    font-size: clamp(2rem, 5vw, 4.8rem);
    font-style: italic;
    font-weight: 800;
    letter-spacing: 0;
    line-height: 0.92;
    color: var(--lab-ink);
    text-transform: uppercase;
    margin: 0;
}

.header h1,
.header .lab-kicker,
.header .header-desc,
.header .mode-toggle {
    grid-column: 1 / 2;
}

.lab-kicker,
.mono-label {
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 10px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--lab-muted);
}

.header p,
.header .header-desc {
    max-width: 760px;
    color: var(--lab-muted);
    font-size: 1rem;
}

.home-btn {
    position: static;
    grid-column: 2 / 3;
    grid-row: 1 / span 2;
}

.header.has-lobby-bar .home-btn {
    top: auto;
}

.lang-toggle,
.home-btn,
.mode-btn,
.welcome-mode-btn,
.welcome-file-btn,
.welcome-join-btn,
.welcome-btn,
.dictionary-btn,
.guide-btn,
.hints-toggle-btn,
.category-hints-toggle-btn,
.leaderboard-btn,
.lobby-copy-btn,
.lobby-leaderboard-btn,
.lobby-download-btn,
.submit-btn,
.deselect-btn,
.new-game-btn,
.llm-refresh-btn,
.llm-run-btn {
    border-radius: 7px;
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.mode-toggle,
.welcome-mode-toggle {
    justify-content: flex-start;
}

.mode-btn,
.welcome-mode-btn,
.home-btn,
.lang-toggle,
.welcome-file-btn,
.welcome-join-btn,
.deselect-btn {
    background: var(--lab-panel);
    border: 2px solid var(--lab-line);
    color: var(--lab-ink);
}

.mode-btn:hover,
.welcome-mode-btn:hover,
.home-btn:hover,
.lang-toggle:hover,
.welcome-file-btn:hover,
.welcome-join-btn:hover {
    border-color: var(--lab-primary);
    color: var(--lab-primary);
}

.mode-btn.active,
.welcome-mode-btn.active,
.submit-btn,
.new-game-btn,
.welcome-btn,
.lobby-copy-btn,
.lobby-leaderboard-btn,
.lobby-download-btn,
.dictionary-btn,
.guide-btn,
.hints-toggle-btn,
.category-hints-toggle-btn,
.leaderboard-btn,
.llm-refresh-btn,
.llm-run-btn {
    background: var(--lab-primary);
    border: 2px solid var(--lab-primary);
    color: #fff;
}

.submit-btn:hover:not(:disabled),
.new-game-btn:hover,
.welcome-btn:hover,
.dictionary-btn:hover,
.guide-btn:hover,
.hints-toggle-btn:hover,
.category-hints-toggle-btn:hover,
.leaderboard-btn:hover,
.lobby-copy-btn:hover,
.lobby-leaderboard-btn:hover,
.lobby-download-btn:hover,
.llm-refresh-btn:hover:not(:disabled),
.llm-run-btn:hover:not(:disabled) {
    background: #343434;
}

.submit-btn:disabled,
.llm-refresh-btn:disabled,
.llm-run-btn:disabled,
.category-hints-toggle-btn:disabled {
    background: #a6a7a0;
    border-color: #a6a7a0;
}

.game-info,
.welcome-card,
.welcome-settings,
.welcome-actions-panel,
.templates-box,
.modal-content,
.llm-bench-panel {
    background: rgba(255, 255, 255, 0.94);
    border: 2px solid var(--lab-line);
    border-radius: 8px;
    box-shadow: var(--lab-shadow);
}

.game-info {
    padding: 12px;
}

.timer-display,
.score-display,
.round-display {
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    color: var(--lab-ink);
}

.score-display {
    color: var(--lab-green);
}

.mistake-dot {
    border-color: var(--lab-primary);
    background: var(--lab-panel);
}

.mistake-dot.used {
    background: var(--lab-red);
    border-color: var(--lab-red);
}

.round-display {
    background: rgba(36, 107, 159, 0.08);
    border: 1px dashed rgba(36, 107, 159, 0.45);
}

.game-main {
    align-items: flex-start;
}

.game-board {
    gap: 10px;
}

.concept-card {
    min-height: 110px;
    background: var(--lab-panel);
    border: 2px solid transparent;
    border-radius: 8px;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
    color: var(--lab-ink);
    font-size: clamp(12px, 1.35vw, 16px);
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1.16;
    overflow-wrap: anywhere;
    text-transform: uppercase;
}

.concept-card:hover {
    border-color: rgba(21, 21, 21, 0.38);
    transform: translateY(-1px);
}

.concept-card.selected {
    background: var(--lab-primary);
    border-color: var(--lab-primary);
    color: #fff;
}

.concept-card.correct {
    background: rgba(37, 120, 79, 0.12);
    border-color: var(--lab-green);
    color: var(--lab-green);
}

.concept-card.incorrect {
    background: rgba(180, 72, 63, 0.12);
    border-color: var(--lab-red);
    color: var(--lab-red);
}

.concept-card.incorrect.selected {
    background: var(--lab-primary);
    color: #fff;
    border-color: var(--lab-primary);
}

.category-slots {
    gap: 12px;
    margin-bottom: 12px;
}

.category-slot {
    border: 2px dashed var(--lab-line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.84);
    min-height: 118px;
}

.category-slot.filled {
    background: rgba(37, 120, 79, 0.1);
    border-color: var(--lab-green);
}

.category-name {
    color: var(--lab-ink);
    font-weight: 800;
}

.category-concepts {
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    color: var(--lab-muted);
}

.concept-tooltip {
    background: var(--lab-ink);
    border: 1px solid #000;
    border-radius: 8px;
}

.tooltip-title {
    color: #fff;
}

.welcome-screen {
    background:
        radial-gradient(circle at 1px 1px, rgba(21, 21, 21, 0.12) 1px, transparent 0),
        var(--lab-bg);
    background-size: 24px 24px;
}

.welcome-card {
    max-width: 1040px;
}

.welcome-card h1,
.welcome-desc,
.welcome-card .lab-kicker {
    text-align: left;
}

.welcome-desc,
.welcome-hint,
.welcome-option-group label,
.welcome-actions-panel label,
.modal p {
    color: var(--lab-muted);
}

.welcome-panel-title {
    color: var(--lab-ink);
    font-weight: 800;
}

.templates-textarea,
.room-name-input,
.win-name-prompt input,
#welcome-room-link,
#llm-model-input,
.lobby-link {
    border: 2px solid var(--lab-line);
    border-radius: 7px;
    background: #fff;
    color: var(--lab-ink);
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

.templates-textarea:focus,
.room-name-input:focus,
.win-name-prompt input:focus,
#welcome-room-link:focus,
#llm-model-input:focus {
    outline: none;
    border-color: var(--lab-primary);
}

.leaderboard-item,
.concept-item {
    border-radius: 7px;
    background: var(--lab-soft);
    border-left-color: var(--lab-blue);
}

.solution-category.easy { background: rgba(180, 118, 31, 0.1); border-left-color: var(--lab-amber); }
.solution-category.medium { background: rgba(36, 107, 159, 0.1); border-left-color: var(--lab-blue); }
.solution-category.hard { background: rgba(37, 120, 79, 0.1); border-left-color: var(--lab-green); }
.solution-category.harder { background: rgba(180, 72, 63, 0.1); border-left-color: var(--lab-red); }

.llm-bench-panel {
    padding: 16px;
}

.llm-bench-summary,
.llm-run-row {
    display: flex;
    gap: 10px;
    align-items: center;
    justify-content: space-between;
}

.llm-bench-summary {
    cursor: pointer;
    list-style: none;
}

.llm-bench-summary::-webkit-details-marker {
    display: none;
}

.llm-bench-summary::before {
    content: "▸";
    color: var(--lab-muted);
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 14px;
}

.llm-bench-panel[open] .llm-bench-summary::before {
    content: "▾";
}

.llm-bench-summary > span:first-child {
    display: grid;
    gap: 2px;
    margin-right: auto;
}

.llm-bench-summary strong {
    color: var(--lab-ink);
    font-family: "Playfair Display", Georgia, serif;
    font-size: 1.45rem;
    font-style: italic;
    line-height: 1;
}

.llm-bench-body {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 14px;
}

.llm-status-pill {
    flex: 0 0 auto;
    border: 1px solid var(--lab-line);
    border-radius: 999px;
    padding: 4px 8px;
    background: var(--lab-soft);
    color: var(--lab-muted);
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 10px;
    text-transform: uppercase;
}

.llm-status-pill.running {
    background: rgba(36, 107, 159, 0.12);
    color: var(--lab-blue);
}

.llm-status-pill.ready {
    background: rgba(37, 120, 79, 0.12);
    color: var(--lab-green);
}

.llm-status-pill.error {
    background: rgba(180, 72, 63, 0.12);
    color: var(--lab-red);
}

.llm-controls label {
    display: block;
    margin-bottom: 6px;
    color: var(--lab-muted);
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 10px;
    text-transform: uppercase;
}

#llm-model-input {
    min-width: 0;
    width: 100%;
    padding: 9px 10px;
    font-size: 12px;
}

.llm-run-btn {
    flex: 0 0 auto;
    padding: 9px 14px;
    cursor: pointer;
}

.llm-refresh-btn {
    flex: 0 0 auto;
    padding: 9px 12px;
    cursor: pointer;
}

.llm-metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
}

.llm-metrics-grid > div {
    min-width: 0;
    padding: 10px;
    border: 1px solid var(--lab-line);
    border-radius: 7px;
    background: var(--lab-soft);
}

.llm-metrics-grid strong {
    display: block;
    margin-top: 2px;
    color: var(--lab-ink);
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 1.25rem;
}

.llm-trace {
    max-height: 280px;
    overflow: auto;
    border: 1px solid var(--lab-line);
    border-radius: 7px;
    background: #fff;
    padding: 10px;
    color: var(--lab-muted);
    font-size: 12px;
}

.llm-trace p {
    margin: 0;
}

.llm-reasoning-panel {
    margin-top: 12px;
    border-top: 1px solid var(--lab-line);
    padding-top: 10px;
}

.llm-reasoning-panel summary {
    cursor: pointer;
    color: var(--lab-ink);
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
}

.llm-reasoning-panel pre {
    margin: 8px 0 0;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    color: var(--lab-muted);
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 11px;
    line-height: 1.45;
}

.llm-guess {
    display: grid;
    gap: 4px;
    padding: 9px 0;
    border-bottom: 1px solid var(--lab-line);
}

.llm-guess:last-child {
    border-bottom: 0;
}

.llm-guess-title {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    color: var(--lab-ink);
    font-weight: 700;
}

.llm-guess-title span {
    color: var(--lab-muted);
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 10px;
    text-transform: uppercase;
}

.llm-guess.correct .llm-guess-title span {
    color: var(--lab-green);
}

.llm-guess.incorrect .llm-guess-title span {
    color: var(--lab-red);
}

@media (max-width: 900px) {
    .container {
        padding: 12px;
    }

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

    .header h1,
    .header .lab-kicker,
    .header .header-desc,
    .header .mode-toggle,
    .home-btn {
        grid-column: 1;
        grid-row: auto;
    }

    .home-btn {
        justify-self: start;
    }

    .game-info {
        align-items: stretch;
    }

    .game-controls {
        width: 100%;
    }

    .game-controls button {
        flex: 1 1 auto;
        padding: 8px 9px;
    }

    .concept-card {
        min-height: 58px;
        padding: 8px 4px;
    }

    .llm-bench-panel {
        margin-top: 8px;
    }
}

@media (max-width: 560px) {
    .llm-metrics-grid {
        grid-template-columns: 1fr;
    }

    .llm-run-row {
        align-items: stretch;
        flex-direction: column;
    }
}