:root {
    --bg-color-from: #e0c3fc;
    --bg-color-to: #8ec5fc;
    --card-bg: rgba(255, 255, 255, 0.6);
    --card-border: rgba(255, 255, 255, 0.4);
    --text-main: #2d3436;
    --text-muted: #636e72;
    --primary-color: #6c5ce7;
    --primary-hover: #5b4bc4;
    --secondary-color: #0984e3;
    --secondary-hover: #076aba;
    --cell-bg: rgba(255, 255, 255, 0.8);
    --cell-shadow: rgba(0, 0, 0, 0.1);
    --cell-hover: #ffffff;
    --cell-active: #ffeaa7;
    --cell-active-border: #fdcb6e;
    --cell-found: rgba(255, 255, 255, 0);

    --success-color: #00b894;
    --error-color: #d63031;
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    background: linear-gradient(135deg, var(--bg-color-from) 0%, var(--bg-color-to) 100%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    overflow-x: hidden;
}

.glass {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
}

.app-container {
    width: 100%;
    max-width: 1000px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--primary-color);
    margin-bottom: 0.2rem;
}

.logo p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.game-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.score-board {
    font-size: 1.1rem;
    font-weight: 500;
    margin-right: 1rem;
    background: white;
    padding: 0.5rem 1rem;
    border-radius: 30px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

.score-board strong {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin: 0 0.2rem;
}

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-family: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.95rem;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 10px rgba(108, 92, 231, 0.3);
}

.btn.primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.btn.secondary {
    background-color: var(--secondary-color);
    color: white;
    box-shadow: 0 4px 10px rgba(9, 132, 227, 0.3);
}

.btn.secondary:hover {
    background-color: var(--secondary-hover);
    transform: translateY(-2px);
}

.game-content {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: 1.5rem;
    align-items: stretch;
    background: rgba(255, 255, 255, 0.3);
    padding: 1.5rem;
    border-radius: 20px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

#players-container > div:nth-child(2) .game-content {
    flex-direction: row-reverse;
}

.player-zone {
    flex: 1;
    min-width: 320px;
}

.board-section {
    position: relative;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    border: 1px solid rgba(255,255,255,0.4);
    flex: 1;
    max-width: 1200px;
}

.grid-container {
    display: grid;
    gap: 8px;
    width: 100%;
    aspect-ratio: 1 / 1;
    max-width: 1500px;
    margin: 0 auto;
}

.grid-4x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    max-width: 800px;
}

.grid-4x4 .grid-cell {
    font-size: 3rem;
}

.grid-5x5 {
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(5, 1fr);
    max-width: 600px;
}

.grid-7x7 {
    grid-template-columns: repeat(7, 1fr);
    grid-template-rows: repeat(7, 1fr);
    max-width: 600px;
}

.grid-10x10 {
    grid-template-columns: repeat(10, 1fr);
    grid-template-rows: repeat(10, 1fr);
    max-width: 600px;
}

.hidden {
    display: none !important;
}

.menu-container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
}

.menu-card {
    width: 100%;
    padding: 3rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.menu-card h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 900;
}

.menu-card p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.level-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    max-width: 300px;
}

.btn-level {
    padding: 1rem;
    font-size: 1.2rem;
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    transition: all 0.3s ease;
}

.btn-level:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.grid-cell {
    position: relative;
    background: var(--cell-bg);
    border-radius: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-main);
    box-shadow: 0 2px 5px var(--cell-shadow);
    cursor: pointer;
    user-select: none;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 2px solid transparent;
    aspect-ratio: 1 / 1;
}

.grid-cell::before {
    content: attr(data-number);
    position: absolute;
    top: 4px;
    left: 4px;
    background: var(--primary-color);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 4px;
    border-radius: 6px;
    z-index: 1;
    pointer-events: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.grid-container.hide-cell-numbers .grid-cell::before {
    display: none;
}

.grid-cell:hover:not(.found):not(.active) {
    transform: scale(1.1);
    background: var(--cell-hover);
    z-index: 2;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.grid-cell.active {
    background: var(--cell-active);
    border-color: var(--cell-active-border);
    transform: scale(1.1);
    z-index: 3;
    box-shadow: 0 4px 15px rgba(253, 203, 110, 0.4);
    color: #e17055;
}

.grid-cell.found {
    opacity: 0;
    visibility: hidden;
    transform: scale(0.5);
    pointer-events: none;
    transition: all 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

.grid-cell.error {
    animation: shake 0.4s;
    background: #ff7675;
    color: white;
}

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

.grid-cell.success {
    animation: pop 0.4s;
    background: var(--success-color);
    color: white;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    z-index: 10;
    gap: 1rem;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.overlay h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.info-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 280px;
    flex-shrink: 0;
}

.panel {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.5);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.05);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.panel h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-main);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.current-selection-panel {
    flex-grow: 0;
}

.selection-display {
    min-height: 60px;
    background: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    box-shadow: inset 0 2px 6px rgba(0,0,0,0.05);
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 4px;
    color: var(--primary-color);
}

.selection-display .placeholder {
    font-size: 1rem;
    font-weight: 500;
    color: #b2bec3;
    letter-spacing: 0;
}

.found-words-panel {
    height: 350px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.words-list {
    overflow-y: auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding-right: 0.5rem;
}

.words-list::-webkit-scrollbar {
    width: 6px;
}

.words-list::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.05);
    border-radius: 10px;
}

.words-list::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 10px;
}

.word-card {
    background: white;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
    border-left: 4px solid var(--success-color);
    animation: slideIn 0.3s ease forwards;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

.word-card .word-title {
    font-weight: 700;
    color: var(--text-main);
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.word-card .word-meaning {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.4;
}

@media (max-width: 1000px) {
    .game-content {
        flex-direction: column;
        align-items: center;
    }

    .info-section {
        width: 100%;
        max-width: 500px;
    }

    .grid-container {
        max-width: 100%;
        gap: 4px;
    }

    .grid-cell {
        font-size: 1.2rem;
    }

    .game-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .game-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
}