:root {
    --cell-size: clamp(32px, 12vw, 50px);
    --black-cell: #1a1a1a;
    --white-cell: #ffffff;
    --active-color: #74b9ff;
    --word-highlight: #dff9fb;
    --correct-color: #27ae60;
    --incorrect-color: #ff7675;
    --revealed-color: #7f8c8d;
}

* {
    box-sizing: border-box;
}

html,
body {
    max-width: 100%;
    overflow-x: hidden;
}

body {
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #f5f6fa;
    color: #2f3640;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

h1 {
    margin: 0 0 5px;
    text-align: center;
}

.puzzle-selector {
    width: min(100%, 450px);
    margin: 12px 0 20px;
}

.puzzle-selector h2 {
    margin: 0 0 8px;
    font-size: 16px;
    text-align: center;
}

.puzzle-tile-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 6px;
}

.puzzle-tile {
    display: grid;
    aspect-ratio: 1;
    place-items: center;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
    background: #fff;
    color: #2f3640;
    font-size: 14px;
    font-weight: bold;
    text-decoration: none;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.puzzle-tile:hover,
.puzzle-tile:focus-visible {
    border-color: #3498db;
    background: var(--word-highlight);
    outline: 0;
}

.puzzle-tile[aria-current="page"] {
    border-color: #2980b9;
    background: #3498db;
    color: #fff;
}

.timer-container {
    margin-bottom: 25px;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(0, 0, 0, 0.05);
    color: #7f8c8d;
    font-size: 18px;
    font-weight: 600;
}

.game-container {
    display: flex;
    gap: 30px;
    padding: 20px;
    border-radius: 8px;
    background: white;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.crossword-grid {
    display: grid;
    width: fit-content;
    height: fit-content;
    border: 2px solid #333;
    box-sizing: content-box;
}

.cell-wrapper {
    position: relative;
    width: var(--cell-size);
    height: var(--cell-size);
    border: 1px solid #333;
    background: var(--white-cell);
}

.cell-wrapper.black {
    background: var(--black-cell);
}

.cell-wrapper.highlighted-word {
    background: var(--word-highlight);
}

.cell-wrapper.active-cell {
    background: var(--active-color);
}

.cell-number {
    position: absolute;
    z-index: 1;
    top: 2px;
    left: 4px;
    color: #333;
    font-size: 11px;
    font-weight: bold;
    pointer-events: none;
}

.cell-input {
    width: 100%;
    height: 100%;
    border: 0;
    outline: 0;
    background: transparent;
    caret-color: transparent;
    text-align: center;
    text-transform: uppercase;
    font-size: 22px;
    font-weight: bold;
}

.cell-input.correct {
    color: var(--correct-color);
}

.cell-input.incorrect {
    background: rgba(255, 118, 117, 0.1);
    color: var(--incorrect-color);
}

.cell-input.revealed {
    color: var(--revealed-color);
}

.clues-container {
    position: relative;
    width: 250px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.clue-section h2 {
    margin: 0 0 10px;
    padding-bottom: 5px;
    border-bottom: 2px solid #333;
    font-size: 1.17em;
}

.clue-list {
    max-height: 150px;
    margin: 0;
    padding: 0;
    overflow-y: auto;
    list-style: none;
}

.clue-item {
    padding: 6px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

.clue-item:hover {
    background: #f0f0f0;
}

.clue-item.active-clue {
    background: var(--word-highlight);
    font-weight: bold;
}

.clues-container.hidden-clues .clue-list {
    filter: blur(5px);
    pointer-events: none;
    user-select: none;
}

.start-overlay {
    position: absolute;
    z-index: 2;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.85);
}

.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    margin-top: 20px;
}

.puzzle-controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

button,
.button-link {
    padding: 10px 15px;
    border: 0;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    line-height: normal;
    text-decoration: none;
    transition: background 0.2s;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.btn-start {
    padding: 12px 24px;
    background: #2ecc71;
    color: white;
    font-size: 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-start:hover {
    background: #27ae60;
}

.btn-check {
    background: #3498db;
    color: white;
}

.btn-check:hover:not(:disabled) {
    background: #2980b9;
}

.btn-reveal {
    background: #f1c40f;
    color: #2f3640;
}

.btn-reveal:hover:not(:disabled) {
    background: #d4ac0d;
}

.btn-reset {
    background: #95a5a6;
    color: white;
}

.btn-reset:hover {
    background: #7f8c8d;
}

.btn-feedback {
    background: #6c5ce7;
    color: white;
}

.btn-feedback:hover {
    background: #574bce;
}

.feedback-options {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    text-align: center;
}

.feedback-options small {
    color: #7f8c8d;
    font-style: italic;
}

.feedback-options small a {
    color: inherit;
}

.message {
    width: min(34rem, 100%);
    margin-top: 20px;
    padding: 16px;
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    line-height: 1.5;
    text-align: center;
}

[hidden] {
    display: none !important;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }

    h1 {
        padding: 0 10px;
        font-size: 20px;
    }

    .puzzle-tile-grid {
        grid-template-columns: repeat(6, 1fr);
    }

    .game-container {
        width: 100%;
        flex-direction: column;
        align-items: center;
        gap: 15px;
        padding: 12px;
    }

    .clues-container {
        width: 100%;
    }

    .clue-list {
        max-height: 120px;
    }
}