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

:root {
    --cell-size: clamp(30px, 4vw, 50px);
    --cell-font: clamp(0.9em, 2.5vw, 1.4em);
    --key-size: clamp(28px, 3.5vw, 40px);
    --key-font: clamp(0.75em, 2vw, 1em);
    --header-font: clamp(1.2em, 4vw, 1.8em);
    --subtitle-font: clamp(0.75em, 2vw, 0.9em);
    --gap-size: clamp(3px, 0.5vw, 6px);
    --question-btn-size: clamp(20px, 3vw, 28px);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: #ffffff;
    min-height: 100vh;
    max-height: 100vh;
    padding: clamp(5px, 1vh, 10px);
    color: #1a1a1a;
    overflow-x: hidden;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 100%;
    width: 100%;
    background: transparent;
    padding: clamp(5px, 1vh, 10px);
    display: flex;
    flex-direction: column;
    min-height: 0;
    flex: 1;
}

header {
    text-align: center;
    margin-bottom: clamp(8px, 1.5vh, 15px);
    flex-shrink: 0;
}

h1 {
    font-size: var(--header-font);
    color: #1a1a1a;
    margin-bottom: clamp(3px, 0.5vh, 5px);
    font-weight: 700;
    line-height: 1.2;
    cursor: pointer;
    user-select: none;
}

.subtitle {
    font-size: var(--subtitle-font);
    color: #666;
    margin-bottom: clamp(5px, 1vh, 10px);
    line-height: 1.2;
}

.stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: clamp(10px, 2vw, 20px);
    font-size: clamp(0.75em, 2vw, 0.9em);
    font-weight: 600;
    color: #666;
    flex-wrap: wrap;
}

.stats button {
    padding: clamp(4px, 0.8vh, 6px) clamp(8px, 1.5vw, 12px);
    font-size: clamp(0.7em, 1.8vw, 0.85em);
}

.game-area {
    display: flex;
    justify-content: center;
    margin-bottom: clamp(5px, 1vh, 10px);
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}

#crossword-grid {
    display: flex;
    flex-direction: column;
    gap: var(--gap-size);
    width: 100%;
    max-width: 100%;
    align-items: center;
    justify-content: flex-start;
}

.word-row {
    display: flex;
    gap: var(--gap-size);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.category-icon {
    font-size: clamp(1em, 2.5vw, 1.3em);
    color: #1a1a1a;
    margin-right: clamp(4px, 1vw, 8px);
    flex-shrink: 0;
    width: clamp(20px, 3vw, 28px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-icon.fa-heart,
.category-icon.fas.fa-heart {
    color: #e91e63;
}

.category-icon.fa-atom,
.category-icon.fas.fa-atom {
    color: #2196f3;
}

.category-icon.fa-flask,
.category-icon.fas.fa-flask {
    color: #4caf50;
}

.question-btn {
    width: var(--question-btn-size);
    height: var(--question-btn-size);
    border-radius: 50%;
    background: transparent;
    color: #1a1a1a;
    border: 2px solid #1a1a1a;
    font-size: clamp(0.8em, 2vw, 1em);
    font-weight: bold;
    cursor: pointer;
    margin-left: clamp(4px, 1vw, 8px);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
    line-height: 1;
}

.question-btn:hover {
    background: #f5f5f5;
    transform: scale(1.1);
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    background: #ffffff;
    border: 2px solid #d3d6da;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--cell-font);
    font-weight: 700;
    text-transform: uppercase;
    border-radius: 4px;
    transition: all 0.2s ease;
    position: relative;
    flex-shrink: 0;
}

.cell:not(.locked):hover {
    border-color: #878a8c;
}

.cell.locked {
    pointer-events: none;
}

.cell.correct {
    background: #6aaa64;
    border-color: #6aaa64;
    color: white;
    animation: flip 0.5s ease;
}

.cell.incorrect {
    background: #787c7e;
    border-color: #787c7e;
    color: white;
    animation: flip 0.5s ease;
}

@keyframes flip {
    0% {
        transform: rotateX(0);
    }

    50% {
        transform: rotateX(90deg);
    }

    100% {
        transform: rotateX(0);
    }
}

.cell input {
    width: 100%;
    height: 100%;
    border: none;
    background: transparent;
    text-align: center;
    font-size: var(--cell-font);
    font-weight: 700;
    text-transform: uppercase;
    color: #1a1a1a;
    outline: none;
    border-radius: 4px;
    pointer-events: none;
}

.cell.locked input {
    color: white;
    cursor: default;
}

.cell.correct input,
.cell.incorrect input {
    color: white;
}

.virtual-keyboard {
    display: flex;
    flex-direction: column;
    gap: clamp(4px, 0.8vh, 6px);
    margin-top: clamp(5px, 1vh, 10px);
    padding: clamp(8px, 1.5vh, 10px);
    background: #f5f5f5;
    border-radius: 8px;
    max-width: 100%;
    flex-shrink: 0;
}

.keyboard-row {
    display: flex;
    gap: clamp(3px, 0.5vw, 4px);
    justify-content: center;
    flex-wrap: wrap;
}

.key {
    min-width: var(--key-size);
    height: var(--key-size);
    background: #ffffff;
    border: 2px solid #d3d6da;
    border-radius: 4px;
    font-size: var(--key-font);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    color: #1a1a1a;
    padding: 0 clamp(4px, 0.5vw, 8px);
}

.key:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
}

.key:active {
    transform: translateY(0);
    background: #d3d6da;
}

.key.active {
    background: #d3d6da !important;
    color: #1a1a1a !important;
    transform: translateY(0);
    border-color: #d3d6da !important;
}

.key-special {
    min-width: clamp(60px, 8vw, 80px);
    background: #ffffff;
    color: #1a1a1a;
    border-color: #d3d6da;
}

.key-special:hover {
    background: #e0e0e0;
}

.message {
    text-align: center;
    padding: clamp(8px, 1.5vh, 12px);
    border-radius: 8px;
    font-size: clamp(0.8em, 2vw, 0.95em);
    font-weight: 600;
    margin-top: clamp(5px, 1vh, 10px);
    display: none;
    flex-shrink: 0;
}

.message.success {
    background: #6aaa64;
    color: white;
    display: block;
}

.message.error {
    background: #787c7e;
    color: white;
    display: block;
}

.message.info {
    background: #d3d6da;
    color: #1a1a1a;
    display: block;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow: auto;
}

.modal-content {
    background-color: #ffffff;
    margin: clamp(5%, 10vh, 10%) auto;
    padding: clamp(15px, 3vh, 20px);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    max-height: 90vh;
    overflow-y: auto;
}

.close-modal {
    position: absolute;
    right: clamp(10px, 2vw, 15px);
    top: clamp(10px, 2vw, 15px);
    font-size: clamp(20px, 4vw, 28px);
    font-weight: bold;
    color: #999;
    cursor: pointer;
    line-height: 1;
}

.close-modal:hover {
    color: #1a1a1a;
}

.modal-content h2 {
    margin-bottom: clamp(10px, 2vh, 15px);
    color: #1a1a1a;
    font-size: clamp(1.2em, 3vw, 1.5em);
}

.modal-content p {
    margin-bottom: clamp(10px, 2vh, 15px);
    color: #666;
    font-size: clamp(0.9em, 2.2vw, 1em);
}

.modal-content input {
    width: 100%;
    padding: clamp(10px, 2vh, 12px);
    border: 2px solid #d3d6da;
    border-radius: 8px;
    font-size: clamp(0.9em, 2.2vw, 1em);
    margin-bottom: clamp(10px, 2vh, 15px);
}

.modal-content input:focus {
    outline: none;
    border-color: #2196f3;
}

.btn {
    padding: clamp(10px, 2vh, 12px) clamp(20px, 4vw, 24px);
    border: none;
    border-radius: 8px;
    font-size: clamp(0.85em, 2vw, 1em);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: #ffffff;
    color: #1a1a1a;
    border: 2px solid #d3d6da;
}

.btn-primary:hover {
    background: #f5f5f5;
    border-color: #1a1a1a;
}

.btn-secondary {
    background: #ffffff;
    color: #1a1a1a;
    border: 2px solid #d3d6da;
}

.btn-secondary:hover {
    background: #f5f5f5;
    border-color: #1a1a1a;
}

#leaderboard-list {
    margin: clamp(15px, 3vh, 20px) 0;
}

.leaderboard-item {
    display: flex;
    justify-content: space-between;
    padding: clamp(10px, 2vh, 12px);
    margin-bottom: clamp(6px, 1vh, 8px);
    background: #f5f5f5;
    border-radius: 8px;
    border-left: 4px solid #2196f3;
    font-size: clamp(0.85em, 2vw, 1em);
    flex-wrap: wrap;
    gap: 8px;
}

.leaderboard-item.top-1 {
    border-left-color: #ffd700;
    background: #fff9e6;
}

.leaderboard-item.top-2 {
    border-left-color: #c0c0c0;
    background: #f5f5f5;
}

.leaderboard-item.top-3 {
    border-left-color: #cd7f32;
    background: #faf5f0;
}

/* Extra small screens */
@media (max-height: 600px) {
    :root {
        --cell-size: clamp(28px, 3.5vw, 40px);
        --cell-font: clamp(0.8em, 2vw, 1.2em);
        --key-size: clamp(25px, 3vw, 35px);
        --key-font: clamp(0.7em, 1.8vw, 0.9em);
    }

    header {
        margin-bottom: clamp(5px, 1vh, 10px);
    }

    .virtual-keyboard {
        padding: clamp(5px, 1vh, 8px);
        gap: clamp(3px, 0.5vh, 4px);
    }
}

/* Very wide screens */
@media (min-width: 1920px) {
    .container {
        max-width: 1400px;
        margin: 0 auto;
    }
}

/* Landscape orientation on mobile */
@media (orientation: landscape) and (max-height: 600px) {
    :root {
        --cell-size: clamp(25px, 3vw, 35px);
        --cell-font: clamp(0.75em, 1.8vw, 1em);
    }

    header {
        margin-bottom: clamp(3px, 0.5vh, 5px);
    }

    .game-area {
        margin-bottom: clamp(3px, 0.5vh, 5px);
    }

    .virtual-keyboard {
        margin-top: clamp(3px, 0.5vh, 5px);
        padding: clamp(4px, 0.8vh, 6px);
    }
}