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

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background: #121213;
    color: #e0e0e0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 16px;
}

#app {
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 24px;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: #ffffff;
}

.subtitle {
    font-size: 0.95rem;
    color: #888;
    margin-top: 4px;
}

.hidden {
    display: none !important;
}

/* Loading */
#loading-screen {
    text-align: center;
    padding: 60px 0;
    font-size: 1.1rem;
    color: #888;
}

/* Setup box (shared by connect, setup screens) */
.setup-box {
    background: #1e1e22;
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    max-width: 400px;
    margin: 0 auto;
}

.setup-box h2 {
    font-size: 1.4rem;
    margin-bottom: 16px;
}

.setup-info {
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 20px;
}

.setup-box label {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 12px;
    color: #aaa;
}

.setup-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}

.setup-row input[type="range"] {
    width: 200px;
    accent-color: #4a7ab5;
}

#puzzle-count-display {
    font-size: 1.5rem;
    font-weight: 700;
    min-width: 2ch;
    text-align: center;
}

/* --- Buttons --- */
button {
    padding: 12px 24px;
    border-radius: 24px;
    border: 1px solid #555;
    background: transparent;
    color: #e0e0e0;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
}

button:hover {
    background: #2a2a2e;
}

button:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

button:disabled:hover {
    background: transparent;
}

/* Primary: white filled, full-width in setup contexts */
.primary-btn {
    width: 100%;
    background: #e0e0e0;
    color: #1a1a1a;
    border-color: #e0e0e0;
    font-size: 1rem;
    padding: 12px 24px;
}

.primary-btn:hover:not(:disabled) {
    background: #ffffff;
}

.primary-btn:disabled {
    background: #555;
    border-color: #555;
    color: #888;
}

/* Secondary: subtle outline, full-width */
.secondary-btn {
    display: block;
    width: 100%;
    margin-top: 12px;
    font-size: 0.9rem;
    color: #aaa;
    border-color: #444;
}

.secondary-btn:hover {
    color: #e0e0e0;
}

/* Connect form */
.form-group {
    margin-bottom: 16px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 4px;
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #444;
    background: #1a1a1e;
    color: #e0e0e0;
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.15s;
}

.form-group input:focus {
    border-color: #4a7ab5;
}

.divider {
    display: flex;
    align-items: center;
    margin: 20px 0;
    gap: 12px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: #333;
}

.divider span {
    font-size: 0.8rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.ap-status {
    min-height: 28px;
    font-size: 0.85rem;
    margin-bottom: 12px;
    text-align: center;
    padding: 0 8px;
}

.ap-status.connecting { color: #b89f3a; }
.ap-status.connected { color: #5a9a5a; }
.ap-status.error { color: #d45555; }
.ap-status.disconnected { color: #888; }

/* Lobby / puzzle list */
.lobby-header {
    text-align: center;
    margin-bottom: 20px;
    font-size: 0.95rem;
    color: #888;
}

#puzzle-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
}

.puzzle-card {
    background: #2a2a2e;
    border: 2px solid #3a3a3e;
    border-radius: 10px;
    padding: 16px 8px;
    text-align: center;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, transform 0.15s;
}

.puzzle-card:hover:not(.locked) {
    background: #3a3a3e;
    transform: scale(1.03);
}

.puzzle-card.locked {
    opacity: 0.35;
    cursor: not-allowed;
}

.puzzle-card.unlocked {
    border-color: #4a7ab5;
}

.puzzle-card.completed.win {
    border-color: #5a9a5a;
}

.puzzle-card.completed.loss {
    border-color: #b85a5a;
}

.puzzle-card .puzzle-number {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.puzzle-card .puzzle-status {
    font-size: 0.75rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.puzzle-card.locked .puzzle-status {
    color: #555;
}

.puzzle-card.completed.win .puzzle-status {
    color: #5a9a5a;
}

.puzzle-card.completed.loss .puzzle-status {
    color: #b85a5a;
}

#lobby-back-btn {
    max-width: 200px;
    margin: 20px auto 0;
}

/* Game header (back button + puzzle label) */
.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

#back-to-lobby-btn {
    font-size: 0.8rem;
    padding: 6px 14px;
}

#puzzle-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: #aaa;
}

/* Solved area */
#solved-area {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 8px;
}

.solved-group {
    border-radius: 8px;
    padding: 16px 12px;
    text-align: center;
    animation: slideIn 0.4s ease-out;
}

.solved-group .category-name {
    font-weight: 700;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.solved-group .category-words {
    font-size: 0.85rem;
    margin-top: 4px;
    opacity: 0.85;
}

.solved-group .category-source {
    font-size: 0.75rem;
    margin-top: 2px;
    opacity: 0.6;
    font-style: italic;
}

/* Difficulty colors */
.difficulty-1 { background: #b89f3a; color: #1a1a1a; }
.difficulty-2 { background: #5a9a5a; color: #1a1a1a; }
.difficulty-3 { background: #4a7ab5; color: #1a1a1a; }
.difficulty-4 { background: #8b5fb0; color: #1a1a1a; }

/* Board grid */
#board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}

.tile {
    background: #2a2a2e;
    border: 2px solid transparent;
    border-radius: 8px;
    padding: 16px 8px;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition: background 0.15s, border-color 0.15s, transform 0.15s;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    word-break: break-word;
    line-height: 1.2;
}

.tile:hover {
    background: #3a3a3e;
}

.tile.selected {
    background: #4a4a50;
    border-color: #ffffff;
    transform: scale(1.03);
}

.tile.shake {
    animation: shake 0.5s ease-in-out;
}

.tile.pop-out {
    animation: popOut 0.4s ease-in forwards;
}

/* Mistakes */
#mistakes {
    text-align: center;
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: #888;
}

#mistake-dots {
    letter-spacing: 4px;
}

/* Game controls */
#controls {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

#submit-btn {
    background: #e0e0e0;
    color: #1a1a1a;
    border-color: #e0e0e0;
}

#submit-btn:hover:not(:disabled) {
    background: #ffffff;
}

#submit-btn:disabled {
    background: #555;
    border-color: #555;
    color: #888;
}

/* Message area */
#message {
    text-align: center;
    min-height: 24px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #ffd700;
}

/* Game over */
#game-over-screen {
    text-align: center;
    padding: 40px 0;
}

#game-over-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

#game-over-results {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

#back-to-lobby-btn-2 {
    background: #e0e0e0;
    color: #1a1a1a;
    border-color: #e0e0e0;
    font-size: 1rem;
    padding: 12px 32px;
}

#back-to-lobby-btn-2:hover {
    background: #ffffff;
}

/* Animations */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-6px); }
    80% { transform: translateX(6px); }
}

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

@keyframes popOut {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
    100% { transform: scale(0); opacity: 0; }
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: 12px 8px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.85rem;
    }

    .setup-box {
        padding: 24px 16px;
    }

    .setup-box h2 {
        font-size: 1.2rem;
    }

    .form-group input[type="text"],
    .form-group input[type="password"] {
        font-size: 16px; /* prevents iOS zoom on focus */
    }

    .tile {
        padding: 12px 4px;
        font-size: 0.75rem;
        min-height: 50px;
    }

    #controls {
        gap: 8px;
    }

    #controls button {
        padding: 10px 14px;
        font-size: 0.8rem;
    }

    #puzzle-list {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    }

    .puzzle-card {
        padding: 12px 6px;
    }

    .solved-group {
        padding: 12px 8px;
    }

    .solved-group .category-name {
        font-size: 0.9rem;
    }

    .solved-group .category-words {
        font-size: 0.8rem;
    }

    .game-header {
        gap: 8px;
    }
}

@media (max-width: 360px) {
    header h1 {
        font-size: 1.3rem;
    }

    .tile {
        padding: 10px 2px;
        font-size: 0.7rem;
        min-height: 44px;
    }

    #controls button {
        padding: 8px 10px;
        font-size: 0.75rem;
    }
}