/* Main CSS Variables */
:root {
    /* Color Palette */
    --primary-color: #4a6fa5;
    --secondary-color: #166088;
    --accent-color: #47b8e0;
    --background-color: #f5f7fa;
    --text-color: #333333;
    --light-text: #ffffff;
    --success-color: #4caf50;
    --error-color: #f44336;
    --warning-color: #ff9800;
    --info-color: #2196f3;
    
    /* Typography */
    --main-font: 'Roboto', 'Segoe UI', sans-serif;
    --header-font: 'Montserrat', 'Arial', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    
    /* Shadow */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Transition */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--main-font);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--header-font);
    font-weight: 700;
}

/* Game Container */
.game-container {
    width: 100%;
    max-width: 800px;
    height: 100vh;
    max-height: 800px;
    display: flex;
    flex-direction: column;
    background-color: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    position: relative;
}

/* Game Header */
.game-header {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.game-header h1 {
    font-size: 1.8rem;
    margin: 0;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.info-button {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    border: 2px solid var(--light-text);
    border-radius: 50%;
    background-color: transparent;
    color: var(--light-text);
    cursor: pointer;
    transition: var(--transition-fast);
}

.info-button:hover {
    background-color: var(--light-text);
    color: var(--primary-color);
    transform: scale(1.1);
}

.word-list-selector {
    display: flex;
    align-items: center;
}

.word-list-selector label,
.difficulty-selector label {
    margin-right: var(--spacing-sm);
    font-size: 0.9rem;
}

.word-list-selector select,
.difficulty-selector select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--light-text);
    background-color: var(--primary-color);
    color: var(--light-text);
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
    transition: var(--transition-fast);
}

.word-list-selector select:hover,
.word-list-selector select:focus,
.difficulty-selector select:hover,
.difficulty-selector select:focus {
    background-color: var(--secondary-color);
}

.difficulty-selector {
    display: flex;
    align-items: center;
}

/* Game Board */
.game-board {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
    overflow: hidden;
}

/* Word Display */
.word-display {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.anchor-word-container,
.link-word-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    background-color: var(--background-color);
    box-shadow: var(--shadow-sm);
}

.anchor-word-container h2,
.link-word-container h2 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--secondary-color);
}

.word {
    font-size: 2rem;
    font-weight: bold;
    letter-spacing: 2px;
    display: flex;
    justify-content: center;
    min-height: 40px; /* Ensure minimum height even when empty */
}

.word-with-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.word .letter {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    margin: 0 2px;
    border-radius: var(--border-radius-sm);
    background-color: white;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.word .letter:hover {
    background-color: var(--accent-color);
    color: white;
    transform: scale(1.05);
}

.word .letter.selected {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

/* Game Controls */
.game-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.alphabet-bank {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
}

.letter-button {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    border: none;
    border-radius: var(--border-radius-sm);
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: var(--transition-fast);
}

.letter-button:hover {
    background-color: var(--secondary-color);
    transform: scale(1.05);
}

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

/* Word Shift Controls */
.shift-button {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border: none;
    border-radius: var(--border-radius-md);
    background-color: var(--secondary-color);
    color: white;
    cursor: pointer;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.shift-button:hover {
    background-color: var(--primary-color);
    transform: scale(1.1);
}

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

.action-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.game-button {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius-md);
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

#hint-button {
    background-color: var(--info-color);
}

#hint-button:hover {
    background-color: #1976d2;
}

#concede-button {
    background-color: var(--warning-color);
}

#concede-button:hover {
    background-color: #e68900;
}

#restart-button {
    background-color: var(--error-color);
    display: none; /* Hidden by default, will be shown when game is over */
}

#restart-button:hover {
    background-color: #d32f2f;
}

#restart-button.visible {
    display: inline-block;
}

#continue-button {
    background-color: var(--success-color);
    display: none; /* Hidden by default, will be shown when needed */
}

#continue-button:hover {
    background-color: #388e3c;
}

#continue-button.visible {
    display: inline-block;
}

/* Game Info */
.game-info {
    display: flex;
    justify-content: space-between;
    background-color: var(--background-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.word-info,
.score-info {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm) var(--spacing-md);
}

.info-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.info-label {
    font-size: 0.8rem;
    color: var(--secondary-color);
    font-weight: bold;
}

.info-value {
    font-size: 1.2rem;
    font-weight: bold;
}

/* Chain Display */
.chain-display-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--background-color);
}

.chain-container {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.chain-container h3 {
    font-size: 1rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.word-chain {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: 40px;
}

.chain-word {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius-sm);
    font-weight: bold;
    position: relative;
}

.chain-word::after {
    content: "→";
    position: absolute;
    right: -15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-color);
    font-weight: bold;
}

.chain-word:last-child::after {
    content: "";
}

.chain-word.success {
    background-color: var(--success-color);
    animation: pulse 1s infinite;
}

.chain-word.broken {
    background-color: var(--error-color);
    text-decoration: line-through;
}

.chain-word.optimal {
    background-color: var(--info-color);
}

.optimal-chain-container {
    display: none; /* Hidden by default, shown at end of round */
}

.optimal-chain-container.visible {
    display: block;
}

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

/* Message Area */
.message-area {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-md);
    text-align: center;
    font-weight: bold;
}

/* Overlay & Instructions */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

.instructions-container {
    background-color: white;
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 500px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.instructions-container h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.instructions-content {
    margin-bottom: var(--spacing-lg);
}

.instructions-content p {
    margin-bottom: var(--spacing-sm);
}

#close-instructions {
    display: block;
    margin: 0 auto;
}

/* Word header - for dictionary lookup */
.word-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* Dictionary lookup button */
.lookup-button {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    border: 1px solid var(--primary-color);
    border-radius: 50%;
    background-color: var(--light-text);
    color: var(--primary-color);
    cursor: pointer;
    transition: var(--transition-fast);
    flex-shrink: 0;  /* Prevent button from shrinking */
}

.lookup-button:hover {
    background-color: var(--primary-color);
    color: var(--light-text);
    transform: scale(1.1);
}

/* Definition popup */
#definition-popup {
    display: none;
}

#definition-popup.active {
    display: flex;
}

.definition-container {
    background-color: white;
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 500px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.definition-container h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.definition-content {
    max-height: 400px;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.definition-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.definition-header h3 {
    color: var(--secondary-color);
    margin: 0;
    font-size: 1.5rem;
}

.phonetic {
    color: var(--secondary-color);
    font-style: italic;
}

.definition-loading {
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
}

.definition-loading.active {
    display: flex;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

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

.definition-part {
    margin-bottom: var(--spacing-md);
}

.definition-part h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
    font-style: italic;
}

.definition-list {
    list-style-position: inside;
    padding-left: var(--spacing-md);
}

.definition-list li {
    margin-bottom: var(--spacing-sm);
}

.definition-example {
    color: var(--secondary-color);
    font-style: italic;
    margin-top: var(--spacing-xs);
}

#close-definition {
    align-self: center;
}

/* ===== FEEDBACK SYSTEM STYLES ===== */
.feedback-content {
    max-width: 500px;
    padding: var(--spacing-lg);
}

.feedback-content h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.feedback-content p {
    color: var(--text-color);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
    text-align: center;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    color: var(--text-color);
    font-weight: bold;
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--secondary-color);
    border-radius: var(--border-radius-md);
    background-color: var(--background-color);
    color: var(--text-color);
    font-size: 14px;
    font-family: var(--main-font);
    box-sizing: border-box;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 5px rgba(71, 184, 224, 0.3);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.feedback-status {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    text-align: center;
    font-weight: bold;
}

.feedback-status.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.feedback-status.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.feedback-status.sending {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}