/* === File: style.css =====================================================
   AGENT: PURPOSE    — Core styling for Treedle game
   AGENT: STATUS     — in-progress (2025-12-27)
   ========================================================================= */

/* Dark mode (default) */
:root {
    --bg-primary: #121213;
    --bg-secondary: #1a1a1b;
    --text-primary: #ffffff;
    --text-secondary: #818384;
    --border-color: #3a3a3c;
    --correct: #538d4e;
    --present: #b59f3b;
    --absent: #3a3a3c;
    --key-bg: #818384;
    --error: #ff6b6b;
    --error-bg: rgba(255, 107, 107, 0.1);
    --blank-bg: #2a2518;
    --blank-hover-bg: #3a3020;
    --blank-hover-border: #d4b84a;
    --blank-filled-bg: #3d351f;
    --blank-selected-border: #ffffff;
    --blank-unfilled: #6b7fd7;
    --blank-unfilled-hover: #8b9fe7;
    --blank-unfilled-bg: #1e2340;
    --blank-unfilled-bg-hover: #2a3050;
    --edge-color: var(--text-secondary);
    --warning-bg: rgba(181, 159, 59, 0.2);
    color-scheme: dark;
}

/* Light mode */
@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #ffffff;
        --bg-secondary: #f5f5f5;
        --text-primary: #1a1a1b;
        --text-secondary: #6b6b6b;
        --border-color: #d4d4d4;
        --correct: #6aaa64;
        --present: #c9b458;
        --absent: #787c7e;
        --key-bg: #d3d6da;
        --error: #dc3545;
        --error-bg: rgba(220, 53, 69, 0.1);
        --blank-bg: #fef3cd;
        --blank-hover-bg: #ffeeba;
        --blank-hover-border: #d4a437;
        --blank-filled-bg: #fff3cd;
        --blank-selected-border: #1a1a1b;
        --blank-unfilled: #5563c1;
        --blank-unfilled-hover: #6b7fd7;
        --blank-unfilled-bg: #e8ebf7;
        --blank-unfilled-bg-hover: #dde1f3;
        --edge-color: #999999;
        --warning-bg: rgba(201, 180, 88, 0.3);
        color-scheme: light;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

#app {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem 2.5rem;
}

/* Header */
.header {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: 0.2rem;
    text-transform: uppercase;
}

.header-btns {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: background-color 0.2s, border-color 0.2s;
}

.btn-icon:hover {
    background-color: var(--bg-secondary);
    border-color: var(--text-secondary);
}

/* Drop zone */
.drop-zone {
    width: 100%;
    max-width: 550px;
    margin: 0 auto;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background-color 0.2s;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--present);
    background-color: var(--bg-secondary);
}

.drop-zone::before {
    content: "📂";
    display: block;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    opacity: 0.6;
}

.drop-zone p {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

.drop-zone .hint {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Stats */
.stats {
    margin: 1rem 0;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    width: 100%;
}

.stats p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Question */
.question-container {
    width: 100%;
    margin: 1rem 0;
}

.question {
    font-size: 1.25rem;
    text-align: center;
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

/* Answer options */
.options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    padding: 1rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
    text-align: left;
}

.option-btn:hover {
    background-color: var(--border-color);
}

.option-btn.correct {
    background-color: var(--correct);
    border-color: var(--correct);
}

.option-btn.incorrect {
    background-color: var(--absent);
    border-color: var(--absent);
}

/* Score */
.score {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin: 1rem 0;
}

/* Buttons */
.btn {
    background-color: var(--correct);
    border: none;
    border-radius: 6px;
    color: white;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

.btn-sm {
    padding: 0.45rem 0.9rem;
    font-size: 0.8rem;
    border-radius: 5px;
}

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--key-bg);
}

/* Result */
.result {
    text-align: center;
    padding: 2rem;
}

.result h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* Game container */
.game-container {
    width: 100%;
}

/* Status bar */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.6rem 1.25rem;
    background-color: var(--bg-secondary);
    border-radius: 6px;
    margin: 0 auto 1rem;
    max-width: fit-content;
}

.status-text {
    font-weight: 600;
    font-size: 0.9rem;
}

/* Tree visualization area */
.tree-area {
    position: relative;
    margin: 0 auto;
    padding: 1rem;
    min-height: 150px;
    overflow: visible;
}

.tree-inner {
    position: relative;
    margin: 0 auto;
}

/* SVG connection lines - behind cards */
.tree-edges {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: -1;
}

.edge-parent-child {
    fill: none;
    stroke: var(--text-secondary);
    stroke-width: 2;
}

.edge-spouse {
    fill: none;
    stroke: var(--present);
    stroke-width: 2;
    stroke-dasharray: 5 3;
}

/* Person card */
.person-card {
    position: absolute;
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 0.6rem;
    width: 120px;
    min-height: 58px;
    text-align: center;
    transition: border-color 0.2s, box-shadow 0.2s;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.person-card:hover {
    border-color: var(--text-secondary);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.person-card .name {
    font-weight: 600;
    font-size: 0.8rem;
    line-height: 1.1;
    margin-bottom: 0.2rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.person-card .years {
    font-size: 0.7rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

/* Blank/hidden person card - unfilled (blue/purple - colorblind safe) */
.person-card.blank {
    border: 2px dashed var(--blank-unfilled);
    background-color: var(--blank-unfilled-bg);
    cursor: pointer;
}

.person-card.blank:hover {
    border-color: var(--blank-unfilled-hover);
    background-color: var(--blank-unfilled-bg-hover);
}

.person-card.blank .name {
    color: var(--blank-unfilled-hover);
    font-size: 1rem;
    font-weight: 700;
}

/* Selected blank card */
.person-card.blank.selected {
    border-color: var(--blank-selected-border);
    box-shadow: 0 0 0 2px var(--present);
}

/* Filled blank card (has a guess, pending verification - yellow) */
.person-card.blank.filled {
    border-color: var(--present);
    background-color: var(--blank-bg);
}

.person-card.blank.filled .name {
    color: var(--present);
    font-size: 0.9rem;
}

.person-card.blank.filled:hover {
    border-color: var(--blank-hover-border);
    background-color: var(--blank-hover-bg);
}

/* Locked correct blank card (verified correct in previous attempt - green) */
.person-card.blank.locked-correct {
    border-color: var(--correct);
    background-color: rgba(83, 141, 78, 0.2);
}

.person-card.blank.locked-correct .name {
    color: var(--correct);
    font-size: 0.9rem;
}

.person-card.blank.locked-correct:hover {
    border-color: var(--correct);
    background-color: rgba(83, 141, 78, 0.3);
}

/* Search modal */
.search-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(2px);
}

.search-modal {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    width: 90%;
    max-width: 340px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.search-modal-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    text-align: center;
}

.search-input {
    width: 100%;
    padding: 0.85rem 1rem;
    font-size: 1rem;
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}

.search-input:focus {
    border-color: var(--present);
    box-shadow: 0 0 0 3px rgba(181, 159, 59, 0.2);
}

.search-input::placeholder {
    color: var(--text-secondary);
}

/* Search dropdown */
.search-dropdown {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-top: 8px;
    max-height: 200px;
    overflow-y: auto;
}

.search-option {
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: background-color 0.15s;
    font-size: 0.95rem;
}

.search-option:hover {
    background-color: var(--bg-secondary);
}

.search-option:first-child {
    border-radius: 7px 7px 0 0;
}

.search-option:last-child {
    border-radius: 0 0 7px 7px;
}

/* History container */
.history-container {
    margin: 1rem auto;
    padding: 1rem 1.25rem;
    background-color: var(--bg-secondary);
    border-radius: 10px;
    max-width: 600px;
}

.history-title {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.history-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.5rem;
}

.attempt-num {
    width: 1.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.history-cell {
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    flex: 1;
    text-align: center;
    max-width: 120px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-cell.correct {
    background-color: var(--correct);
    color: var(--text-primary);
}

.history-cell.wrong-pos {
    background-color: var(--present);
    color: var(--text-primary);
}

.history-cell.wrong {
    background-color: var(--absent);
    color: var(--text-primary);
}

/* Answer reveal */
.answers-reveal {
    margin: 0.75rem 1rem;
    padding: 0.75rem;
    background-color: var(--error-bg);
    border: 1px solid var(--error);
    border-radius: 6px;
    text-align: center;
}

.answers-title {
    font-size: 0.875rem;
    color: var(--error);
    margin-bottom: 0.75rem;
}

.answers-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.answer-name {
    background-color: var(--correct);
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

/* Controls area (legacy, keeping for reference) */

/* Button states */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn:disabled:hover {
    opacity: 0.5;
}

/* Error message */
.error-msg {
    background-color: var(--error-bg);
    border: 1px solid var(--error);
    border-radius: 4px;
    padding: 0.75rem;
    margin: 1rem 0;
    text-align: center;
    color: var(--error);
}

/* Warning message */
.warning-msg {
    background-color: var(--warning-bg);
    border: 1px solid var(--present);
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
    text-align: center;
    color: var(--present);
    font-size: 0.85rem;
    margin: 0.5rem 1rem;
}

/* Warning button */
.btn-warning {
    background-color: var(--present);
}

/* Demo select dropdown */
.demo-select {
    padding: 0.65rem 1rem;
    font-size: 0.95rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    min-width: 180px;
}

.demo-select:hover {
    border-color: var(--text-secondary);
}

.demo-select:focus {
    border-color: var(--present);
}

.demo-select option {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.5rem;
}

/* Footer - sticky */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.5rem 1rem;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.privacy-notice {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

.footer-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.help-btn {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    border: 1px solid var(--text-secondary);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.help-btn:hover {
    opacity: 1;
}

.version {
    font-size: 0.65rem;
    color: var(--text-secondary);
    opacity: 0.4;
    font-family: monospace;
}

/* Help modal */
.help-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(2px);
}

.help-modal {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    width: 90%;
    max-width: 400px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.help-modal h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    text-align: center;
}

.help-modal p {
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.help-modal .highlight {
    color: var(--text-primary);
    font-weight: 600;
}

.help-modal .color-key {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1rem 0;
}

.help-modal .color-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
}

.help-modal .color-box {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 4px;
    flex-shrink: 0;
}

.help-modal .color-box.blue {
    background-color: var(--blank-unfilled-bg);
    border: 2px dashed var(--blank-unfilled);
}

.help-modal .color-box.yellow {
    background-color: var(--blank-bg);
    border: 2px solid var(--present);
}

.help-modal .color-box.green {
    background-color: rgba(83, 141, 78, 0.2);
    border: 2px solid var(--correct);
}