/* ==========================================
   Math Versus — Dark Theme Stylesheet
   ========================================== */

/* ---------- CSS Variables ---------- */
:root {
    --bg-primary: #0a0a14;
    --bg-secondary: #12121e;
    --bg-card: #1a1a2e;
    --bg-input: #16213e;
    --bg-hover: #1f2b47;

    --accent-primary: #00d4ff;
    --accent-primary-dim: #00a8cc;
    --accent-success: #00ff88;
    --accent-danger: #ff4757;
    --accent-warning: #ffa502;
    --accent-purple: #a855f7;

    --text-primary: #e8e8f0;
    --text-secondary: #8888aa;
    --text-muted: #555577;

    --border: #2a2a4a;
    --border-focus: #00d4ff55;

    --radius: 12px;
    --radius-sm: 8px;

    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.6);

    --transition: 0.2s ease;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}

/* ---------- Screen Management ---------- */
.screen {
    display: none;
    min-height: 100vh;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- Buttons ---------- */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dim));
    color: #000;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #33ddff, var(--accent-primary));
}

.btn-secondary {
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.btn-small {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.btn-large {
    padding: 16px 48px;
    font-size: 1.2rem;
}

/* ---------- Inputs ---------- */
input[type="text"], textarea, select {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: 12px 16px;
    font-size: 1rem;
    transition: border-color var(--transition);
    width: 100%;
    font-family: inherit;
}

input[type="text"]:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--border-focus);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238888aa' stroke-width='2' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

/* ---------- Utilities ---------- */
.hidden { display: none !important; }

.error-msg {
    background: rgba(255, 71, 87, 0.15);
    border: 1px solid var(--accent-danger);
    color: var(--accent-danger);
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    margin-top: 16px;
    font-size: 0.9rem;
}

.accent { color: var(--accent-primary); }

/* ---------- Fraction Display ---------- */
.fraction {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    vertical-align: middle;
    margin: 0 4px;
    font-size: 0.85em;
    line-height: 1.1;
}

.fraction .num {
    border-bottom: 2px solid var(--text-primary);
    padding: 0 4px 2px;
}

.fraction .den {
    padding: 2px 4px 0;
}

/* ---------- Reconnect Banner ---------- */
.reconnect-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(90deg, #ff9900, #ff5500);
    color: #000;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 10px 16px;
    text-align: center;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

.reconnect-spinner {
    display: inline-block;
    animation: spin 1.2s linear infinite;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}



/* ==========================================================
   SCREEN 1: JOIN / CREATE
   ========================================================== */

#screen-join {
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.join-container {
    text-align: center;
    max-width: 520px;
    width: 100%;
}

.logo {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -1px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.join-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.input-group {
    margin-bottom: 24px;
}

.divider-or {
    text-align: center;
    margin: 16px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.join-actions {
    display: flex;
    gap: 24px;
    align-items: stretch;
}

.action-block {
    flex: 1;
    text-align: center;
}

.action-block h3 {
    font-size: 1rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.action-block p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.action-divider {
    display: flex;
    align-items: center;
    color: var(--text-muted);
    font-weight: 700;
    font-size: 0.85rem;
}

.code-input-group {
    display: flex;
    gap: 8px;
}

.code-input-group input {
    font-size: 1.2rem;
    text-align: center;
    letter-spacing: 3px;
    font-weight: 700;
    flex: 1;
}

/* Mobile responsive */
@media (max-width: 540px) {
    .join-actions {
        flex-direction: column;
    }
    .action-divider {
        justify-content: center;
        padding: 8px 0;
    }
    .logo {
        font-size: 2.2rem;
    }
}


/* ==========================================================
   SCREEN 2: LOBBY
   ========================================================== */

#screen-lobby {
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.lobby-container {
    max-width: 600px;
    width: 100%;
}

.lobby-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.lobby-header h2 {
    font-size: 1.8rem;
}

.room-code-display {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.room-code-display .label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0;
}

.room-code-display .code {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-primary);
    letter-spacing: 4px;
    font-family: 'Courier New', monospace;
}

/* Settings */
.settings-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
}

.settings-panel h3 {
    margin-bottom: 16px;
    font-size: 1.1rem;
}

.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 540px) {
    .settings-grid { grid-template-columns: 1fr; }
}

/* Player list */
.player-list-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
}

.player-list-section h3 {
    margin-bottom: 16px;
}

.player-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.player-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    transition: border-color var(--transition);
}

.player-item.ready {
    border-color: var(--accent-success);
}

.player-item.disconnected {
    opacity: 0.5;
    background: rgba(255, 255, 255, 0.03);
}

.player-away-badge {
    font-size: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.lobby-header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.results-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-top: 16px;
}


.player-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    color: #000;
    flex-shrink: 0;
}

.player-name {
    flex: 1;
    font-weight: 600;
}

.player-host-badge {
    font-size: 0.75rem;
    background: var(--accent-warning);
    color: #000;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 700;
    text-transform: uppercase;
}

.player-ready-icon {
    font-size: 1.3rem;
    opacity: 0.3;
    transition: opacity var(--transition);
}

.player-item.ready .player-ready-icon {
    opacity: 1;
}

.spectator-info {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Ready section */
.ready-section {
    text-align: center;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.ready-toggle {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    margin-bottom: 0;
}

.ready-toggle input[type="checkbox"] {
    appearance: none;
    width: 28px;
    height: 28px;
    border: 2px solid var(--border);
    border-radius: 6px;
    background: var(--bg-input);
    cursor: pointer;
    position: relative;
    transition: all var(--transition);
}

.ready-toggle input[type="checkbox"]:checked {
    background: var(--accent-success);
    border-color: var(--accent-success);
}

.ready-toggle input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #000;
    font-weight: 900;
    font-size: 1rem;
}

.ready-status {
    margin-top: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}


/* ==========================================================
   SCREEN 3: GAME
   ========================================================== */

#screen-game {
    flex-direction: column;
}

.game-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 16px 20px;
}

/* Top bar */
.game-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 12px;
}

.question-progress {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.question-progress .counter {
    font-weight: 700;
    color: var(--accent-primary);
    font-size: 1.1rem;
}

.game-scoreboard {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.score-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    font-size: 0.9rem;
}

.score-item .score-name {
    color: var(--text-secondary);
}

.score-item .score-value {
    font-weight: 800;
    color: var(--accent-primary);
    font-size: 1.1rem;
}

.score-item.leader {
    border-color: var(--accent-warning);
}

.score-item.leader .score-value {
    color: var(--accent-warning);
}

/* Inactivity bar */
.inactivity-bar-wrapper {
    height: 4px;
    background: var(--bg-card);
    border-radius: 2px;
    margin-bottom: 16px;
    overflow: hidden;
}

.inactivity-bar {
    height: 100%;
    width: 100%;
    background: var(--accent-success);
    border-radius: 2px;
    transition: width 0.5s linear, background-color 0.3s ease;
}

.inactivity-bar.warning {
    background: var(--accent-warning);
}

.inactivity-bar.danger {
    background: var(--accent-danger);
}

/* Countdown overlay */
.countdown-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 20, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.countdown-value {
    font-size: 8rem;
    font-weight: 900;
    color: var(--accent-primary);
    animation: countPulse 0.8s ease;
}

@keyframes countPulse {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); opacity: 1; }
}

/* Question area */
.question-area {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    min-height: 120px;
}

.question-display {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    line-height: 1.6;
    word-break: break-word;
}

.question-display sup {
    font-size: 0.6em;
    vertical-align: super;
}

/* Answer section */
.answer-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.workspace-section textarea {
    resize: vertical;
    min-height: 80px;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    line-height: 1.6;
}

.answer-row {
    display: flex;
    gap: 12px;
}

.answer-row input {
    flex: 1;
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
}

.answer-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: 4px;
}

/* Feedback overlay */
.feedback-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 90;
    pointer-events: none;
}

.feedback-content {
    padding: 24px 48px;
    border-radius: var(--radius);
    font-size: 1.5rem;
    font-weight: 700;
    animation: feedbackPop 0.4s ease;
    text-align: center;
}

.feedback-content.correct {
    background: rgba(0, 255, 136, 0.15);
    border: 2px solid var(--accent-success);
    color: var(--accent-success);
}

.feedback-content.wrong {
    background: rgba(255, 71, 87, 0.15);
    border: 2px solid var(--accent-danger);
    color: var(--accent-danger);
}

.feedback-content.skipped {
    background: rgba(255, 165, 2, 0.15);
    border: 2px solid var(--accent-warning);
    color: var(--accent-warning);
}

@keyframes feedbackPop {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

/* Spectator banner */
.spectator-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--accent-purple);
    color: #fff;
    text-align: center;
    padding: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    z-index: 50;
}


/* ==========================================================
   SCREEN 4: RESULTS
   ========================================================== */

#screen-results {
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.results-container {
    max-width: 600px;
    width: 100%;
    text-align: center;
}

#results-title {
    font-size: 2.2rem;
    margin-bottom: 32px;
}

.results-podium {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 16px;
    margin-bottom: 32px;
    min-height: 200px;
}

.podium-spot {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.podium-bar {
    width: 100px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    padding: 16px 8px;
    font-weight: 700;
    transition: height 1s ease;
}

.podium-bar.first {
    background: linear-gradient(180deg, #ffd700, #b8860b);
    height: 180px;
    color: #000;
}

.podium-bar.second {
    background: linear-gradient(180deg, #c0c0c0, #808080);
    height: 130px;
    color: #000;
}

.podium-bar.third {
    background: linear-gradient(180deg, #cd7f32, #8b4513);
    height: 90px;
    color: #fff;
}

.podium-rank {
    font-size: 2rem;
    line-height: 1;
}

.podium-name {
    font-size: 0.95rem;
    font-weight: 700;
    margin-top: 4px;
}

.podium-score {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Full scores table */
.results-full-scores {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
    text-align: left;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
}

.result-row:nth-child(odd) {
    background: var(--bg-secondary);
}

.result-rank {
    width: 36px;
    font-weight: 700;
    color: var(--text-secondary);
}

.result-name {
    flex: 1;
    font-weight: 600;
}

.result-score {
    font-weight: 800;
    color: var(--accent-primary);
    font-size: 1.1rem;
}

.result-row:first-child .result-name {
    color: var(--accent-warning);
}

.result-row:first-child .result-score {
    color: var(--accent-warning);
}

#btn-play-again {
    margin-top: 8px;
}


/* ==========================================================
   Confetti (purely CSS)
   ========================================================== */

@keyframes confettiFall {
    0% { transform: translateY(-100vh) rotate(0deg); opacity: 1; }
    100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

.confetti-piece {
    position: fixed;
    top: -10px;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    animation: confettiFall 3s ease-in forwards;
    z-index: 200;
    pointer-events: none;
}