:root {
    --bg-dark: #1a1a1a;
    --bg-panel: #252525;
    --bg-box: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #888888;
    --border-color: #444444;
    --accent: #4a9eff;
    --correct: #4ade80;
    --partial: #facc15;
    --incorrect: #ef4444;
}

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

body {
    font-family: 'JetBrains Mono', 'Courier New', 'Monaco', 'Consolas', monospace;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    padding: 0.5rem;
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-box);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

@media (min-width: 769px) {
    body {
        padding: 1rem;
        align-items: center;
        justify-content: center;
    }
    
    .container {
        min-height: calc(100vh - 2rem);
    }
}

header {
    padding: 1rem 1.5rem;
    border-bottom: 2px solid var(--border-color);
    background: var(--bg-panel);
    text-align: center;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
    letter-spacing: 2px;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.site-icon {
    width: 1.4rem;
    height: 1.4rem;
}

header p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

#game-info {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

#previous-answer {
    padding: 0.75rem 1.5rem;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-align: center;
}

#previous-answer span {
    color: var(--partial);
}

.info-line {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.game-info-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem;
    flex-wrap: wrap;
}

#options-panel {
    display: inline-flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
    padding: 0.2rem 0.35rem;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    background: transparent;
    margin-left: auto;
    min-width: 340px;
}

.options-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.45rem;
}

.options-content {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.options-checkbox-col,
.options-actions-col {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    min-width: 0;
}

.options-checkbox-col {
    flex: 1;
}

.options-actions-col {
    flex: 1;
}

.options-label {
    color: var(--accent);
    font-size: 0.64rem;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    font-weight: 700;
}

.options-sub-label {
    color: var(--accent);
    font-size: 0.62rem;
    text-transform: uppercase;
    letter-spacing: 0.55px;
    font-weight: 700;
    opacity: 0.9;
}

.option-item {
    display: inline-flex;
    align-items: center;
    gap: 0.28rem;
    font-size: 0.7rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.1rem 0.22rem;
    border-radius: 2px;
    white-space: nowrap;
}

.option-item input[type="checkbox"] {
    accent-color: var(--accent);
    transform: scale(0.9);
}

.options-toggle-btn {
    flex: 0 0 auto;
    width: auto;
    min-width: 0;
    align-self: center;
    padding: 0.22rem 0.45rem;
    font-size: 0.6rem;
    letter-spacing: 0.5px;
    line-height: 1.1;
    border-width: 1px;
}

.option-help-btn {
    margin-left: 0;
    padding: 0.3rem 0.45rem;
    font-size: 0.64rem;
    letter-spacing: 0.6px;
    border-width: 1px;
}

#options-panel.options-collapsed .options-content {
    display: none;
}

.prompt {
    color: var(--accent);
    font-weight: bold;
}

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

.legend {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.legend-color {
    width: 16px;
    height: 16px;
    border: 2px solid;
    border-radius: 2px;
}

.legend-color.correct {
    background: rgba(74, 222, 128, 0.2);
    border-color: var(--correct);
}

.legend-color.partial {
    background: rgba(250, 204, 21, 0.2);
    border-color: var(--partial);
}

.legend-color.incorrect {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--incorrect);
}

#input-section {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    align-items: center;
}

#first-guess-help {
    width: 100%;
    font-size: 0.75rem;
    color: var(--text-secondary);
    letter-spacing: 0.2px;
}

#first-guess-help.hidden {
    display: none;
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 200px;
}

.input-prompt {
    color: var(--accent);
    font-weight: bold;
    font-size: 1rem;
}

#guess-input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 2px;
    color: var(--text-primary);
    font-family: inherit;
}

#guess-input:focus {
    outline: none;
    border-color: var(--accent);
}

#guess-input::placeholder {
    color: var(--text-secondary);
}

.button-group {
    display: flex;
    gap: 0.5rem;
}

.btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.85rem;
    cursor: pointer;
    background: var(--bg-panel);
    border: 2px solid var(--border-color);
    border-radius: 2px;
    color: var(--text-primary);
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s;
}

.btn:hover {
    background: var(--bg-dark);
    border-color: var(--accent);
    color: var(--accent);
}

.btn:active {
    transform: translateY(1px);
}

#guess-btn {
    border-color: var(--accent);
    color: var(--accent);
}

#guess-btn:hover {
    background: rgba(74, 158, 255, 0.1);
}

#feedback-section {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 1.5rem;
}

#feedback-header {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    padding: 0.75rem 0;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-weight: bold;
    font-size: 0.65rem;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    overflow-x: auto;
}

#feedback-header span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    width: 100%;
}

#feedback-section {
    overflow-x: auto;
}

.feedback-row {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.feedback-cell {
    padding: 0.5rem 0.25rem;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    text-align: center;
    font-size: 0.65rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    word-break: break-word;
    background: var(--bg-panel);
    outline: 1px solid var(--border-color);
    outline-offset: -3px;
}

.feedback-cell.correct {
    background: rgba(74, 222, 128, 0.15);
    border-color: var(--correct);
    color: var(--correct);
}

.feedback-cell.partial {
    background: rgba(250, 204, 21, 0.15);
    border-color: var(--partial);
    color: var(--partial);
}

.feedback-cell.incorrect {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--incorrect);
    color: var(--incorrect);
}

.feedback-cell-animated {
    animation: slideInLeft 0.3s ease-out forwards;
    animation-delay: calc(var(--cell-index) * 0.05s);
    opacity: 0;
    transform: translateX(-20px);
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.confetti {
    position: fixed;
    top: -10px;
    z-index: 10001;
    animation: confettiFall 2s ease-out forwards;
}

@keyframes confettiFall {
    to {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0;
    }
}

.hidden {
    display: none !important;
}

#victory-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-box);
    padding: 2rem;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.modal-content h2 {
    margin-bottom: 1rem;
    color: var(--correct);
    font-size: 1.5rem;
}

.modal-content p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.instructions-content {
    max-width: 400px;
    text-align: left;
}

.instructions-list {
    margin: 0 0 1.25rem 1.2rem;
    color: var(--text-primary);
    line-height: 1.55;
    font-size: 0.85rem;
}

.instructions-list li + li {
    margin-top: 0.35rem;
}

#guess-count {
    font-weight: bold;
    color: var(--accent);
    font-size: 3rem;
    display: block;
    margin: 1rem 0;
}

.tries-label {
    color: var(--text-secondary);
}

#play-again-btn {
    margin-top: 1rem;
}

footer {
    padding: 1rem 1.5rem;
    border-top: 2px solid var(--border-color);
    background: var(--bg-panel);
    text-align: center;
}

.footer-line {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
}

.footer-content {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.footer-stats {
    margin-top: 0.5rem;
    font-size: 0.75rem;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

@media (max-width: 768px) {
    body {
        padding: 0;
    }
    
    .container {
        border: none;
        border-radius: 0;
        min-height: 100vh;
    }
    
    header {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 1.4rem;
    }
    
    #game-info {
        padding: 1rem;
    }

    .game-info-top {
        align-items: center;
        flex-wrap: nowrap;
    }

    .info-line {
        flex: 0 0 auto;
        min-width: 0;
    }

    #options-panel {
        width: auto;
        min-width: 0;
        margin-left: auto;
        padding: 0.3rem 0.35rem;
        flex: 1 1 auto;
    }

    #options-panel .options-header-row {
        width: 100%;
        align-items: center;
    }

    #options-panel .options-toggle-btn {
        width: auto;
        min-width: 64px;
        flex: 0 0 auto;
        padding: 0.3rem 0.55rem;
        font-size: 0.64rem;
        letter-spacing: 0.5px;
    }

    #options-panel .options-content {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.45rem;
        align-items: start;
    }

    #options-panel .options-checkbox-col,
    #options-panel .options-actions-col {
        width: 100%;
    }

    #options-panel .option-item,
    #options-panel .option-help-btn {
        width: 100%;
        justify-content: center;
    }

    #options-panel .option-help-btn {
        padding: 0.38rem 0.45rem;
    }

    #options-panel.options-collapsed .options-content {
        display: none;
    }
    
    #input-section {
        padding: 1rem;
        flex-direction: column;
        align-items: stretch;
    }
    
    .input-wrapper {
        min-width: 100%;
    }
    
    .button-group {
        width: 100%;
        flex-wrap: wrap;
    }
    
    .btn {
        flex: 1;
    }
    
    #feedback-header {
        display: none !important;
    }
    
    .feedback-row {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.5rem;
        padding: 0.75rem;
        border: 1px solid var(--border-color);
        border-radius: 6px;
        background: rgba(0, 0, 0, 0.1);
    }

    .feedback-row + .feedback-row {
        margin-top: 0.85rem;
        border-top: 2px dashed var(--border-color);
    }
    
    .feedback-cell {
        min-height: 64px;
        padding: 0.55rem;
        flex-direction: column;
        justify-content: flex-start;
        text-align: left;
        align-items: flex-start;
        gap: 0.35rem;
    }
    
    .feedback-cell::before {
        content: attr(data-label);
        font-size: 0.62rem;
        color: var(--text-secondary);
        text-transform: uppercase;
        letter-spacing: 0.4px;
        line-height: 1.2;
    }

    .site-icon {
        width: 1.15rem;
        height: 1.15rem;
    }
    
    .legend {
        gap: 1rem;
    }
    
    .legend-item {
        font-size: 0.75rem;
    }
    
    #feedback-section {
        padding: 1rem;
    }
    
    footer {
        padding: 1rem;
    }
}

/* Learn Mode Modal Styles */
#learn-mode-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.learn-mode-content {
    max-width: 1000px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
}

.learn-mode-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.learn-mode-header h2 {
    margin: 0;
    color: var(--accent);
    font-size: 1.3rem;
}

.btn-close {
    font-size: 1.5rem;
    padding: 0.25rem 0.75rem;
    line-height: 1;
    min-width: auto;
}

.learn-mode-filters {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

#learn-search {
    flex: 1;
    min-width: 200px;
    padding: 0.5rem 0.75rem;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 2px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
}

#learn-search:focus {
    outline: none;
    border-color: var(--accent);
}

#learn-category-filter {
    padding: 0.5rem 0.75rem;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 2px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
}

#learn-category-filter:focus {
    outline: none;
    border-color: var(--accent);
}

.learn-filter-checkbox {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 2px;
}

.learn-filter-checkbox input[type="checkbox"] {
    accent-color: var(--accent);
}

.learn-expand-controls {
    display: flex;
    gap: 0.35rem;
    margin-left: auto;
}

.btn-small {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
}

.learn-tree-container {
    flex: 1;
    overflow-y: auto;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 2px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.tree-node {
    margin: 0.25rem 0;
    padding: 0.5rem 0.75rem;
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.tree-node:hover {
    background: rgba(74, 158, 255, 0.1);
}

.tree-node-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.tree-expand-icon {
    display: inline-block;
    width: 16px;
    text-align: center;
    color: var(--accent);
    font-weight: bold;
    user-select: none;
}

.tree-expand-icon.no-children {
    opacity: 0;
}

.tree-line-prefix {
    color: var(--text-secondary);
    white-space: pre;
    font-family: monospace;
}

.tree-node-name {
    font-weight: bold;
    color: var(--text-primary);
    position: relative;
    cursor: help;
}

.tree-node-name:hover {
    color: var(--accent);
}

.distro-tooltip {
    position: fixed;
    background: var(--bg-panel);
    border: 2px solid var(--accent);
    border-radius: 4px;
    padding: 0.75rem;
    z-index: 10000;
    pointer-events: none;
    min-width: 250px;
    max-width: 350px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    animation: tooltipFadeIn 0.15s ease-out;
}

.distro-tooltip-header {
    font-weight: bold;
    color: var(--accent);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.distro-tooltip-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 0.5rem;
    margin: 0.35rem 0;
    font-size: 0.8rem;
}

.distro-tooltip-label {
    color: var(--text-secondary);
    font-weight: normal;
}

.distro-tooltip-value {
    color: var(--text-primary);
    font-weight: 500;
}

@keyframes tooltipFadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tree-node-symbols {
    color: var(--partial);
    font-size: 0.85rem;
}

.tree-children {
    margin-left: 20px;
}

.tree-children.collapsed {
    display: none;
}

/* Category background colors */
.cat-desktop {
    background: rgba(74, 158, 255, 0.15);
}

.cat-server {
    background: rgba(139, 92, 246, 0.15);
}

.cat-gaming {
    background: rgba(250, 204, 21, 0.15);
}

.cat-security {
    background: rgba(239, 68, 68, 0.15);
}

.cat-enterprise {
    background: rgba(16, 185, 129, 0.15);
}

/* Difficulty border colors */
.diff-beginner {
    border-color: #4ade80 !important;
}

.diff-intermediate {
    border-color: #facc15 !important;
}

.diff-advanced {
    border-color: #fb923c !important;
}

.diff-expert {
    border-color: #ef4444 !important;
}

.learn-legend {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 2px;
}

.legend-section h3 {
    font-size: 0.75rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.legend-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.35rem;
    font-size: 0.75rem;
}

.legend-grid div {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.legend-box {
    width: 20px;
    height: 16px;
    border: 2px solid;
    border-radius: 2px;
    display: inline-block;
}

.symbol {
    font-weight: bold;
    color: var(--partial);
}

/* Mobile responsive */
@media (max-width: 768px) {
    #learn-mode-modal {
        padding: 0;
    }

    .learn-mode-content {
        max-width: 100%;
        max-height: 100vh;
        border-radius: 0;
        padding: 1rem;
    }

    .learn-mode-header h2 {
        font-size: 1.1rem;
    }

    .learn-mode-filters {
        flex-direction: column;
        align-items: stretch;
    }

    #learn-search,
    #learn-category-filter {
        width: 100%;
    }

    .learn-expand-controls {
        width: 100%;
        margin-left: 0;
    }

    .learn-expand-controls button {
        flex: 1;
    }

    .tree-line-prefix {
        display: none;
    }

    .tree-children {
        margin-left: 15px;
    }

    .learn-legend {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .tree-node {
        padding: 0.75rem;
    }

    .tree-node-content {
        font-size: 0.85rem;
    }
}