:root {
    /* Light theme variables */
    --background-color: #f5f5f7;
    --text-color: #333;
    --header-bg: #4c7cff;
    --header-text: white;
    --card-bg: white;
    --border-color: #ddd;
    --input-bg: white;
    --button-primary-bg: #4c8c4a;
    --button-primary-text: white;
    --button-secondary-bg: #e0e0e0;
    --button-secondary-text: #333;
    --keyboard-bg: #e0e0e0;
    --keyboard-text: #333;
    --letter-box-border: #ccc;
    --letter-correct-bg: #6aaa64;
    --letter-correct-text: white;
    --letter-present-bg: #c9b458;
    --letter-present-text: white;
    --letter-absent-bg: #787c7e;
    --letter-absent-text: white;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

@media (prefers-color-scheme: dark) {
    :root.system-theme {
        /* Dark theme variables */
        --background-color: #121213;
        --text-color: #d7dadc;
        --header-bg: #2c3e50;
        --header-text: #d7dadc;
        --card-bg: #1a1a1c;
        --border-color: #3a3a3c;
        --input-bg: #2c2c2e;
        --button-primary-bg: #538d4e;
        --button-primary-text: white;
        --button-secondary-bg: #3a3a3c;
        --button-secondary-text: #d7dadc;
        --keyboard-bg: #818384;
        --keyboard-text: white;
        --letter-box-border: #3a3a3c;
        --letter-correct-bg: #538d4e;
        --letter-correct-text: white;
        --letter-present-bg: #b59f3b;
        --letter-present-text: white;
        --letter-absent-bg: #3a3a3c;
        --letter-absent-text: white;
        --shadow-color: rgba(0, 0, 0, 0.3);
    }
}

:root.dark-theme {
    /* Dark theme variables */
    --background-color: #121213;
    --text-color: #d7dadc;
    --header-bg: #2c3e50;
    --header-text: #d7dadc;
    --card-bg: #1a1a1c;
    --border-color: #3a3a3c;
    --input-bg: #2c2c2e;
    --button-primary-bg: #538d4e;
    --button-primary-text: white;
    --button-secondary-bg: #3a3a3c;
    --button-secondary-text: #d7dadc;
    --keyboard-bg: #818384;
    --keyboard-text: white;
    --letter-box-border: #3a3a3c;
    --letter-correct-bg: #538d4e;
    --letter-correct-text: white;
    --letter-present-bg: #b59f3b;
    --letter-present-text: white;
    --letter-absent-bg: #3a3a3c;
    --letter-absent-text: white;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0;
}

header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 15px 0;
    text-align: center;
    position: relative;
    margin-bottom: 20px;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    width: 100%;
}

header h1 {
    margin-bottom: 5px;
}

header h2 {
    font-size: 1rem;
    font-weight: normal;
    margin-bottom: 10px;
}

.theme-switcher {
    position: absolute;
    top: 15px;
    right: 15px;
}

select {
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-color);
}

main {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.game-instructions, .game-settings, .word-library-management, #random-word-settings {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 6px var(--shadow-color);
    margin-bottom: 20px;
}

h3 {
    margin-bottom: 15px;
    color: var(--text-color);
}

/* Horizontal examples layout */
.examples-horizontal {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 15px;
    margin-top: 15px;
}

.example-item {
    flex: 1;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.example-grid {
    display: flex;
    gap: 2px;
}

.example-item p {
    margin-top: 10px;
    text-align: center;
}

.letter-box {
    width: 40px;
    height: 40px;
    border: 2px solid var(--letter-box-border);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 1.2rem;
    text-transform: uppercase;
}

.letter-box.correct {
    background-color: var(--letter-correct-bg);
    color: var(--letter-correct-text);
    border-color: var(--letter-correct-bg);
}

.letter-box.present {
    background-color: var(--letter-present-bg);
    color: var(--letter-present-text);
    border-color: var(--letter-present-bg);
}

.letter-box.absent {
    background-color: var(--letter-absent-bg);
    color: var(--letter-absent-text);
    border-color: var(--letter-absent-bg);
}

.setting {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.setting label {
    flex: 1;
    margin-right: 10px;
}

.setting input, .setting select {
    width: 100px;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-color);
}

.library-selector, .library-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.library-selector select {
    flex: 1;
}

button {
    padding: 8px 12px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    background-color: var(--button-secondary-bg);
    color: var(--button-secondary-text);
}

button:hover {
    opacity: 0.9;
}

.primary-button {
    background-color: var(--button-primary-bg);
    color: var(--button-primary-text);
    padding: 10px 20px;
    font-size: 1rem;
    width: 100%;
    margin-top: 15px;
}

.secondary-button {
    background-color: var(--button-secondary-bg);
    color: var(--button-secondary-text);
}

.mode-button {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 10px 20px;
    font-size: 1rem;
    width: 100%;
    margin-top: 15px;
    margin-bottom: 15px;
}

.words-input {
    margin-top: 15px;
}

.words-input label {
    display: block;
    margin-bottom: 5px;
}

.words-input textarea {
    width: 100%;
    padding: 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-color);
    resize: vertical;
}

/* Game Section Styles */
#game-section {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0;
    background-color: var(--background-color);
    align-items: center;
}

/* Adjust the word display layout */
.word-display {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin: 0 0 20px;
}

/* Add styles for all word grids */
.all-words-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin: 0 0 15px;
    justify-content: center;
    max-width: 800px;
}

.word-row {
    display: flex;
    gap: 2px;
    margin-right: 5px;
    margin-bottom: 5px;
}

/* Make grid cells more consistent with the screenshot */
.grid-cell {
    width: 35px;
    height: 35px;
    border: 1px solid var(--letter-box-border);
    border-radius: 2px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 1.2rem;
    text-transform: uppercase;
    background-color: transparent;
}

.grid-cell.active {
    border-color: var(--text-color);
    border-width: 2px;
}

/* Improved Keyboard Styles */
.keyboard {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin: 15px auto;
    width: 100%;
    max-width: 500px;
    padding: 0 10px;
}

.keyboard-row {
    display: flex;
    gap: 3px;
    width: 100%;
    justify-content: center;
}

.keyboard button {
    flex: 1;
    height: 45px;
    border-radius: 4px;
    font-weight: bold;
    background-color: #d3d6da;
    color: #1a1a1b;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
    font-size: 1rem;
    min-width: 0;
    border: none;
    margin: 0 2px;
}

/* Adjust the keyboard row widths */
.keyboard-row:first-child {
    width: 100%;
}

.keyboard-row:nth-child(2) {
    width: 90%;
    margin: 0 auto;
}

.keyboard-row:nth-child(3) {
    width: 100%;
}

.keyboard button.wide-key {
    flex: 1.5;
    font-size: 0.9rem;
}

.keyboard button.correct {
    background-color: var(--letter-correct-bg);
    color: var(--letter-correct-text);
}

.keyboard button.present {
    background-color: var(--letter-present-bg);
    color: var(--letter-present-text);
}

.keyboard button.absent {
    background-color: var(--letter-absent-bg);
    color: var(--letter-absent-text);
}

/* Multi-word grid styles */
.multi-word-grid {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.word-index {
    font-weight: bold;
    font-size: 1.2rem;
    min-width: 25px;
}

.word-grid {
    display: flex;
    gap: 5px;
}

.current-word {
    background-color: rgba(76, 124, 255, 0.1);
    border-radius: 8px;
    padding: 5px;
}

.completed-word {
    opacity: 0.6;
}

#backToMainMenu {
    width: 100%;
    margin-top: 20px;
}

@media (max-width: 600px) {
    .container {
        padding: 0 10px;
    }
    
    .examples-horizontal {
        flex-direction: column;
        align-items: center;
    }
    
    .example-item {
        width: 100%;
    }
    
    .letter-box {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
    
    .grid-cell {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    .keyboard {
        max-width: 100%;
        margin-top: 10px;
    }
    
    .keyboard button {
        min-width: 28px;
        height: 58px;
        font-size: 0.9rem;
        margin: 0 1px;
    }
    
    .keyboard button.wide-key {
        min-width: 45px;
    }
    
    .keyboard-row {
        gap: 2px;
    }
}

.section-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 6px var(--shadow-color);
    margin-bottom: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.setting input, .setting select {
    width: 100px;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-color);
}

.full-width-input {
    width: 100% !important;
}

.setting {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.setting label {
    flex: 1;
    margin-right: 10px;
    white-space: nowrap;
}

/* Batch words input styles */
.batch-words-input {
    margin-top: 15px;
    margin-bottom: 15px;
}

.batch-words-input label {
    display: block;
    margin-bottom: 10px;
}

.batch-words-input textarea {
    width: 100%;
    padding: 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-color);
    resize: vertical;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Word Grid Container Styles */
.word-grid-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
    width: 100%;
}

.word-column {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.word-grid {
    display: flex;
    gap: 5px;
    margin-bottom: 5px;
}

/* Dark Theme Override */
:root.dark-theme .grid-cell, 
:root.system-theme .grid-cell {
    background-color: #1e1e1e;
    border-color: #444;
    color: #d7dadc;
}

/* Current word indicator adjustment */
.current-word-indicator {
    font-size: 1rem;
    margin: 10px 0;
    text-align: left;
    padding-left: 10px;
    align-self: flex-start;
}

.input-grid {
    width: 100%;
    max-width: 350px;
    margin: 0 auto 15px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.grid-row {
    display: flex;
    gap: 2px;
    justify-content: center;
}

.grid-cell.correct {
    background-color: var(--letter-correct-bg);
    color: var(--letter-correct-text);
    border-color: var(--letter-correct-bg);
}

.grid-cell.present {
    background-color: var(--letter-present-bg);
    color: var(--letter-present-text);
    border-color: var(--letter-present-bg);
}

.grid-cell.absent {
    background-color: var(--letter-absent-bg);
    color: var(--letter-absent-text);
    border-color: var(--letter-absent-bg);
}

/* Text alignment */
.text-center {
    text-align: center;
}

/* Full width select */
.full-width-select {
    width: 100% !important;
    max-width: none !important;
    box-sizing: border-box;
    padding: 8px;
    font-size: 1rem;
}

/* Button container for side-by-side buttons */
.button-container {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    width: 100%;
}

/* Half-width buttons */
.half-width {
    flex: 1;
    margin: 0;
    min-width: 0;
}

/* Ensure buttons have proper spacing and styling */
.primary-button, .secondary-button {
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

.primary-button {
    background-color: var(--button-primary-bg);
    color: var(--button-primary-text);
}

.secondary-button {
    background-color: var(--button-secondary-bg);
    color: var(--button-secondary-text);
}

/* Toast notification styles */
.toast-notification {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 15px 25px;
    border-radius: 8px;
    font-size: 1rem;
    z-index: 1000;
    max-width: 80%;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.toast-notification.show {
    opacity: 1;
}

/* Return to setup button */
.return-button {
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    margin-top: 10px;
    cursor: pointer;
    font-weight: bold;
}

/* Confirm dialog specific styles */
.confirm-dialog {
    padding: 20px;
    min-width: 250px;
    max-width: 90%;
}

.confirm-dialog .button-container {
    display: flex;
    justify-content: center;
    margin-top: 15px;
}

/* 查看单词库样式 */
.view-library-content table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--card-bg);
    border-radius: 4px;
    overflow: hidden;
}

.view-library-content th,
.view-library-content td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.view-library-content th {
    background-color: var(--header-bg);
    color: var(--header-text);
    font-weight: bold;
}

.view-library-content tr:nth-child(even) {
    background-color: rgba(0, 0, 0, 0.05);
}

.view-library-content tr:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

/* 为表格添加响应式支持 */
@media (max-width: 500px) {
    .view-library-content table {
        font-size: 0.85rem;
    }
    
    .view-library-content th,
    .view-library-content td {
        padding: 8px 10px;
    }
}

/* Free mode section */
#free-mode-section {
    width: 100%;
}

.words-input {
    margin-top: 15px;
}