/* ==========================================================================
   Bibliomeet Sudoku — style.css (Multiplayer Edition)
   Dark mode premium con sidebar leaderboard e layout landing
   ========================================================================== */

:root {
    --bg-color: #0d0d0d;
    --card-bg: #1a1a2e;
    --card-bg-2: #16213e;
    --surface: #1e1e2e;
    --text-primary: #e8e8f0;
    --text-secondary: #9090a8;
    --accent-color: #00d2ff;
    --accent-hover: #0099cc;
    --accent-glow: rgba(0, 210, 255, 0.2);
    --success-color: #00e676;
    --error-color: #ff5252;
    --gold: #ffd600;
    --border-color: #2a2a4a;
    --grid-cell-size: min(8vw, 48px);
    --grid-size: 9;
    --block-rows: 3;
    --block-cols: 3;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* RESET */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    background-image: radial-gradient(ellipse at 20% 20%, rgba(0, 210, 255, 0.04) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 80%, rgba(100, 0, 255, 0.04) 0%, transparent 60%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: var(--accent-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Link "Bibliomeet" fisso in alto a sinistra */
.bibliomeet-home-link {
    position: fixed;
    top: 14px;
    left: 16px;
    z-index: 1000;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 5px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    transition: color 0.2s, background 0.2s;
    letter-spacing: 0.03em;
}

.bibliomeet-home-link:hover {
    color: var(--accent-color);
    background: rgba(0, 210, 255, 0.08);
    text-decoration: none;
}


code {
    background: rgba(0, 210, 255, 0.12);
    border-radius: 6px;
    padding: 2px 8px;
    font-size: 0.9em;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   LANDING PAGE
   ========================================================================== */

.landing-body {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 2rem 1rem 4rem;
}

#landing-app {
    width: 100%;
    max-width: 1000px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.landing-header {
    text-align: center;
    padding-top: 1.5rem;
}

.logo-mark {
    font-size: 3rem;
    display: block;
    margin-bottom: 0.5rem;
    filter: drop-shadow(0 0 12px var(--accent-color));
}

.landing-header h1 {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 0.4rem;
}

.landing-header h1 span {
    color: var(--accent-color);
    font-weight: 300;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.landing-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.landing-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.landing-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
}

.card-master {
    border-top: 3px solid var(--accent-color);
}

.card-player {
    border-top: 3px solid var(--success-color);
}

.card-icon {
    font-size: 2.2rem;
    margin-bottom: 0.2rem;
}

.landing-card h2 {
    font-size: 1.3rem;
    font-weight: 600;
}

.landing-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-row label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-row-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.form-row-group .form-row {
    flex: 1;
}

.form-row select,
.form-row input[type="text"],
.form-row input[type="number"] {
    background: var(--surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.65rem 1rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    width: 100%;
    height: 42px;
}

.form-row select:focus,
.form-row input[type="text"]:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    text-align: center;
}

/* AUDIO SWITCH */
.switch-row {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
    padding-top: 1rem;
    margin-bottom: 0.5rem;
}

.switch-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--surface-light);
    transition: .4s;
    border-radius: 22px;
    border: 1px solid var(--border-color);
}

.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color), #0077b6);
    color: #000;
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
    filter: brightness(0.95);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--success-color), #00a66c);
    color: #000;
}

.btn-secondary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

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

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

.spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(0, 0, 0, 0.2);
    border-top-color: #000;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.alert-error {
    background: rgba(255, 82, 82, 0.12);
    border: 1px solid var(--error-color);
    color: var(--error-color);
    border-radius: var(--radius);
    padding: 0.9rem 1.2rem;
    font-size: 0.95rem;
    text-align: center;
}

.landing-footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}


/* ==========================================================================
   MASTER DASHBOARD
   ========================================================================== */

.master-body {
    min-height: 100vh;
    padding: 1rem;
}

#master-app {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.master-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 1.5rem;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.master-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.room-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.2rem;
}

.room-status-badge {
    padding: 0.4rem 1rem;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    background: rgba(0, 210, 255, 0.15);
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.room-status-badge.status-playing {
    background: var(--success-color);
    color: #000;
}

.room-status-badge.status-finished {
    background: var(--text-secondary);
    color: #fff;
}

.room-status-badge.status-rush {
    background: linear-gradient(135deg, #ff00ff, #7000ff);
    color: #fff;
    box-shadow: 0 0 15px rgba(255, 0, 255, 0.4);
    animation: rushPulse 0.8s infinite alternate;
}

.status-waiting {
    background: rgba(255, 214, 0, 0.12);
    color: var(--gold);
    border-color: var(--gold);
}

.master-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 1.5rem;
    align-items: start;
}

.master-aside {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.qr-card,
.info-card,
.leaderboard-card,
.my-progress-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.2rem 1rem;
    box-shadow: var(--shadow-sm);
}

.card-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.8rem;
}

#qrcode-container {
    display: flex;
    justify-content: center;
    padding: 1rem;
    background: #1e1e1e;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

#qrcode-container canvas,
#qrcode-container img {
    border-radius: 8px;
}

.join-url-box {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
}

.join-url-box input {
    flex: 1;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-secondary);
    padding: 0.5rem 0.8rem;
    font-size: 0.8rem;
    font-family: monospace;
    outline: none;
}

.btn-copy {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 0.5rem 0.8rem;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
    color: var(--text-primary);
}

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

.room-code-big {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent-color);
    text-shadow: 0 0 20px var(--accent-glow);
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.info-row:last-child {
    border-bottom: none;
}

.info-row span {
    color: var(--text-secondary);
}

.info-row strong {
    font-weight: 700;
}

.winner-row strong {
    color: var(--gold);
    font-size: 1.1rem;
}

.hidden {
    display: none !important;
}

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--success-color);
    color: #000;
    padding: 0.6rem 1.5rem;
    border-radius: 100px;
    font-weight: 600;
    font-size: 0.95rem;
    z-index: 9999;
    animation: toastIn 0.3s ease;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(10px);
    }
}


/* ==========================================================================
   PLAYER PAGE
   ========================================================================== */

.player-body {
    min-height: 100vh;
    padding: 0.5rem;
}

#player-app {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.player-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 1.2rem;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.player-header h1 {
    font-size: 1.3rem;
    font-weight: 600;
}

.player-header h1 span {
    color: var(--accent-color);
    font-weight: 300;
}

.status-bar-top {
    display: flex;
    gap: 1.2rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

#timer {
    color: var(--accent-color);
    font-weight: 600;
}

#mistakes {
    color: var(--error-color);
}

.player-layout {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 1rem;
    align-items: start;
}

.player-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.player-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: sticky;
    top: 1rem;
}


/* ==========================================================================
   SUDOKU GRID
   ========================================================================== */

#game-container {
    display: flex;
    justify-content: center;
}

#sudoku-grid {
    display: grid;
    grid-template-columns: repeat(var(--grid-size), var(--grid-cell-size));
    grid-template-rows: repeat(var(--grid-size), var(--grid-cell-size));
    border: 6px ridge rgba(0, 210, 255, 0.7);
    background-color: rgba(0, 210, 255, 0.15);
    gap: 1px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(0, 210, 255, 0.1);
    border-radius: 4px;
}

.cell {
    background: var(--card-bg);
    color: var(--accent-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: calc(var(--grid-cell-size) * 0.55);
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition: background 0.1s ease, color 0.1s ease;
}

.cell:hover {
    background: #232340;
}

.cell.selected {
    background: var(--accent-color) !important;
    color: #000 !important;
    font-weight: 800;
}

.cell.fixed {
    color: #000;
    background: #dde8f5;
    font-weight: 700;
}

.cell.error {
    color: #fff;
    background: rgba(255, 82, 82, 0.85);
    animation: shake 0.3s ease;
}

.cell.correct {
    color: #000;
    background: rgba(0, 230, 118, 0.75);
}

.cell.same-number {
    background: rgba(0, 210, 255, 0.12);
}

.cell.border-right {
    border-right: 4px ridge rgba(0, 210, 255, 0.5);
}

.cell.border-bottom {
    border-bottom: 4px ridge rgba(0, 210, 255, 0.5);
}

/* Evidenziazione a croce (riga e colonna della cella selezionata) */
.cell.cross-highlight {
    background: rgba(0, 210, 255, 0.12);
    /* Leggermente più visibile */
    color: #fff !important;
    /* Bianco per massimo contrasto */
}

.cell.selected.cross-highlight {
    background: var(--accent-color) !important;
    color: #000 !important;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    50% { transform: translateX(6px); }
    75% { transform: translateX(-3px); }
}

.flash-error {
    animation: flash-red 0.4s ease-out !important;
}

@keyframes flash-red {
    0% { background-color: var(--bg-color); }
    50% { background-color: rgba(255, 82, 82, 0.4); }
    100% { background-color: var(--bg-color); }
}



/* ==========================================================================
   NUMBER PAD
   ========================================================================== */

#number-pad {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
    width: 100%;
    margin: 1.5rem auto 0;
}

#number-pad.pad-4,
#number-pad.pad-6 {
    flex-wrap: nowrap;
    max-width: none;
}

#number-pad.pad-9 {
    max-width: calc(var(--grid-cell-size) * 5 + 3rem);
}

.num-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: var(--grid-cell-size);
    height: var(--grid-cell-size);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.3rem;
    font-weight: 600;
    border-radius: var(--radius);
    cursor: pointer;
    transition: transform 0.1s, background 0.1s;
    user-select: none;
}

.num-btn:hover {
    background: #232340;
}

.num-btn:active {
    transform: scale(0.88);
    background: var(--accent-color);
    color: #000;
}


/* ==========================================================================
   LEADERBOARD
   ========================================================================== */

.lb-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: var(--gold);
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.leaderboard-table thead th {
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.4rem 0.3rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.leaderboard-table tbody tr {
    transition: background 0.15s;
}

.leaderboard-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

.leaderboard-table tbody td {
    padding: 0.5rem 0.3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    vertical-align: middle;
}

.lb-rank {
    font-size: 1rem;
    text-align: center;
    width: 32px;
}

.lb-name {
    font-weight: 500;
    max-width: 90px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lb-name em {
    font-style: normal;
    color: var(--accent-color);
    font-size: 0.8em;
}

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

.lb-errors {
    text-align: center;
    color: var(--error-color);
}

.lb-waiting {
    text-align: center;
    color: var(--text-secondary);
    padding: 1rem 0;
}

.row-winner td {
    color: var(--gold);
    font-weight: 600;
}

.row-me td {
    color: var(--accent-color);
}

/* Progress bar nelle celle leaderboard (solo master) */
.progress-bar {
    position: relative;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 100px;
    height: 18px;
    overflow: hidden;
    display: flex;
    align-items: center;
    min-width: 80px;
}

.progress-bar span {
    position: relative;
    z-index: 1;
    font-size: 0.75rem;
    padding: 0 6px;
    color: var(--text-primary);
    font-weight: 600;
    white-space: nowrap;
}

.progress-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: linear-gradient(90deg, rgba(0, 210, 255, 0.4), rgba(0, 210, 255, 0.7));
    border-radius: 100px;
    transition: width 0.6s ease;
}

/* My progress (player sidebar) */
.my-progress-card .progress-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.6rem;
}

.progress-bar.large {
    height: 24px;
}

.progress-bar.large span {
    font-size: 0.85rem;
}


/* ==========================================================================
   MODAL
   ========================================================================== */

.modal-container {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(6px);
}

.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2.5rem 3rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.7);
    max-width: 380px;
    width: 90%;
    animation: modalPop 0.3s cubic-bezier(.34, 1.56, .64, 1);
}

@keyframes modalPop {
    from {
        transform: scale(0.85);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-icon {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.modal-content h2 {
    font-size: 1.8rem;
    margin-bottom: 0.6rem;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.modal-time {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.modal-time strong {
    color: var(--text-primary);
}

.kickable-name {
    cursor: pointer;
    transition: color 0.2s;
}

.kickable-name:hover {
    color: var(--error-color);
    text-decoration: underline;
}

.kickable-name:hover::after {
    content: " ❌";
    font-size: 0.8rem;
    vertical-align: middle;
}


/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 760px) {
    .landing-cards {
        grid-template-columns: 1fr;
    }

    .form-row-group {
        flex-direction: column;
        gap: 0.8rem;
    }

    .master-layout {
        grid-template-columns: 1fr;
    }

    .player-layout {
        grid-template-columns: 1fr;
    }

    .player-sidebar {
        position: static;
    }

    :root {
        --grid-cell-size: 9.5vw;
    }

    .master-header {
        flex-direction: column;
        gap: 0.8rem;
        text-align: center;
    }

    .player-header {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
}

@media (max-width: 400px) {
    .landing-header h1 {
        font-size: 1.8rem;
    }
}

#timer.timer-warning {
    color: #ff4d4d !important;
    animation: timerBlink 1s infinite;
    font-weight: 700;
}

#timer.rush-active {
    color: #ff00ff !important;
    text-shadow: 0 0 10px rgba(255, 0, 255, 0.5);
    animation: rushPulse 0.5s infinite alternate !important;
}

@keyframes timerBlink {
    0% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }

    100% {
        opacity: 1;
    }
}

@keyframes rushPulse {
    from {
        transform: scale(1);
        opacity: 1;
    }

    to {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

/* RUSH TIME BANNER */
.rush-banner {
    position: fixed;
    top: 20px;
    left: 0;
    right: 0;
    margin: 0 auto;
    width: fit-content;
    max-width: 90vw;
    background: linear-gradient(135deg, #ff00ff, #7000ff);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 10px 40px rgba(255, 0, 255, 0.5);
    z-index: 10000;
    transition: opacity 0.5s, transform 0.5s;
    animation: bannerSlideIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 2px solid rgba(255, 255, 255, 0.3);
    pointer-events: none;
    /* Evita di bloccare click sotto se non necessario */
}

.rush-banner.fade-out {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
}

@keyframes bannerSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.rush-icon {
    font-size: 1.8rem;
}

.rush-text {
    line-height: 1.2;
    font-size: 0.95rem;
}

.rush-text strong {
    font-size: 1.1rem;
    display: block;
    margin-bottom: 2px;
}

/* Modalità Matita / Note */
.cell {
    position: relative;
}

/* Per posizionamento nota */

.note-digit {
    position: absolute;
    top: 2px;
    right: 5px;
    font-size: 0.9rem;
    /* Dimensione generosa per leggibilità */
    color: #ff4d4d;
    /* Rosso brillante per visibilità su ciano */
    font-weight: 600;
    line-height: 1;
    pointer-events: none;
}

/* Media query per schermi più grandi */
@media (min-width: 480px) {
    .note-digit {
        font-size: 1.1rem;
    }
}

.pencil-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 0.9rem;
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
    font-family: inherit;
    font-weight: 500;
}

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

.pencil-btn.active {
    background: rgba(0, 210, 255, 0.15);
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.1);
}

.pencil-btn .icon {
    font-size: 1rem;
}

/* Gruppo controlli Matita integrato */
.pencil-controls-group {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 3px 8px;
    border-radius: 10px;
    gap: 12px;
    transition: all 0.3s ease;
}

.pencil-controls-group:hover {
    border-color: rgba(0, 210, 255, 0.3);
    background: rgba(255, 255, 255, 0.05);
}

.pencil-actions {
    display: flex;
    gap: 10px;
    border-left: 1px solid var(--border-color);
    padding-left: 12px;
    align-items: center;
}

.pencil-action-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 2px 5px;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    align-items: center;
    filter: grayscale(0.5);
    opacity: 0.8;
}

.pencil-action-btn:hover {
    transform: scale(1.3);
    filter: grayscale(0);
    opacity: 1;
}

.pencil-action-btn.confirm:hover {
    text-shadow: 0 0 10px rgba(0, 230, 118, 0.5);
}

.pencil-action-btn.clear:hover {
    text-shadow: 0 0 10px rgba(255, 82, 82, 0.5);
}

.pencil-sep {
    border-left: 1px solid var(--border-color);
    height: 20px;
    margin: 0 4px;
    opacity: 0.6;
}

/* Rimuoviamo il vecchio bordo dal pulsante singolo se dentro il gruppo */
.pencil-controls-group .pencil-btn {
    border: none;
    background: transparent;
    padding: 0.3rem 0.5rem;
    box-shadow: none;
}

.pencil-controls-group .pencil-btn.active {
    color: var(--accent-color);
}

/* ==========================================================================
   MOBILE OPTIMIZATION (max-width: 768px)
   ========================================================================== */

@media (max-width: 768px) {

    /* Griglia leggermente più piccola per lasciare spazio ai controlli */
    #sudoku-grid {
        width: 90vw;
        max-width: 420px;
        height: 90vw;
        aspect-ratio: 1/1;
        max-height: 420px;
        grid-template-columns: repeat(var(--grid-size), 1fr);
        grid-template-rows: repeat(var(--grid-size), 1fr);
        margin: 5px auto;
        border-width: 4px;
    }

    .cell {
        font-size: 5vw;
    }

    .grid-4 .cell {
        font-size: 11vw;
    }

    .grid-6 .cell {
        font-size: 8.5vw;
    }

    /* Selettori compatti */
    body.game-active .game-setup {
        display: flex !important;
        flex-direction: row;
        justify-content: center;
        gap: 4px;
        padding: 4px;
        background: rgba(0, 0, 0, 0.3);
        margin-bottom: 5px;
    }

    body.game-active .game-setup select,
    body.game-active .game-setup button {
        height: 32px;
        font-size: 0.75rem;
        padding: 0 4px;
        flex: 1;
    }

    /* Box Matita compatto */
    .pencil-controls-group {
        margin: 5px auto;
        padding: 2px 6px;
        transform: scale(0.9);
        /* Leggermente più piccolo su mobile */
    }

    /* Tastierino fisso - Più compatto e meno invadente */
    #number-pad {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        max-width: none !important;
        background: #0d0d1a;
        padding: 10px 5px 25px;
        margin: 0;
        z-index: 2000;
        box-shadow: 0 -3px 20px rgba(0, 0, 0, 1);
        border-top: 2px solid rgba(0, 210, 255, 0.3);
        display: flex !important;
        flex-wrap: wrap !important;
        /* Fondamentale per 6x6 e 4x4 su mobile */
        gap: 6px;
        justify-content: center;
    }

    .num-btn {
        flex: 0 0 60px;
        /* Larghezza fissa ergonomica */
        height: 50px;
        font-size: 1.3rem;
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.06);
        border: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: 0 3px 0 rgba(0, 0, 0, 0.3);
        max-width: 18%;
        /* Assicura max 5 per riga */
    }

    .num-btn[data-num="0"] {
        background: rgba(255, 82, 82, 0.1);
    }

    /* Spazio di scorrimento aumentato per vedere tutto lo schema */
    .player-main,
    .solo-container {
        padding-bottom: 210px;
        /* Ancora un po' di respiro */
    }

    .note-digit {
        font-size: 4.8vw;
        /* Decisamente più grande per leggibilità */
        right: 3px;
        top: 1px;
    }
}

/* Feedback lampeggio rosso per errore */
body.flash-error {
    animation: flashRed 0.3s ease;
}

@keyframes flashRed {

    0%,
    100% {
        background: transparent;
    }

    50% {
        background: rgba(255, 0, 0, 0.25);
    }
}

/* --- CLASSIFICA NELLA MODALE (Dinamica) --- */
.modal-lb-container {
    margin-top: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: left;
    max-width: 100%;
    overflow-x: auto;
}

.modal-lb-title {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--accent-color);
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-lb-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.modal-lb-table th {
    text-align: left;
    color: var(--text-secondary);
    padding: 0.5rem;
    font-size: 0.8rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-lb-table td {
    padding: 0.6rem 0.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.modal-lb-table tr:last-child td {
    border-bottom: none;
}

.modal-lb-table tr.winner {
    background: rgba(46, 204, 113, 0.1);
}

.modal-lb-table tr.winner td:nth-child(2) {
    color: var(--success-color);
    font-weight: 600;
}

.modal-lb-table tr.is-me {
    background: rgba(0, 210, 255, 0.05);
}

.modal-lb-table tr.is-me td:nth-child(2) {
    color: var(--accent-color);
    font-weight: 600;
}

/* Animazione pulsante Rivincita */
@keyframes pulse-gold {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 215, 0, 0.7);
    }

    70% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(255, 215, 0, 0);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 215, 0, 0);
    }
}

.btn-rematch {
    background: linear-gradient(45deg, #ffd700, #ffa500);
    color: #000 !important;
    font-weight: bold;
    border: none;
    padding: 12px 24px;
    border-radius: 30px;
    cursor: pointer;
    animation: pulse-gold 2s infinite;
    transition: all 0.3s ease;
}

.btn-rematch:hover {
    filter: brightness(1.2);
    transform: translateY(-2px);
}

/* --- GYM HUB ADDITIONS --- */
.random-config-card {
    background: var(--card-bg-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    box-shadow: var(--shadow);
}

.config-row {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
}

.config-group {
    flex: 1;
    min-width: 140px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.config-group label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    font-weight: 600;
}

.config-group select {
    background: var(--surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.7rem 1rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    cursor: pointer;
    transition: all 0.2s;
}

.config-group select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

@media (max-width: 600px) {
    .config-row { gap: 1rem; }
    .random-config-card { padding: 1.2rem; }
}