:root[data-theme="light"] {
    --bg-color: #f5f5f7;
    --text-color: #1d1d1f;
    --card-bg: #ffffff;
    --border-color: #d2d2d7;
    --primary-color: #0071e3;
    --primary-hover: #0077ed;
    --secondary-bg: #f5f5f7;
    --secondary-hover: #e8e8ed;
    --shadow-color: rgba(0, 0, 0, 0.08);
}

:root[data-theme="dark"] {
    --bg-color: #1d1d1f;
    --text-color: #f5f5f7;
    --card-bg: #2d2d2f;
    --border-color: #3d3d3f;
    --primary-color: #0a84ff;
    --primary-hover: #0071e3;
    --secondary-bg: #3d3d3f;
    --secondary-hover: #4d4d4f;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    transition: background-color 0.3s ease;
}

.theme-switch {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
}

#themeToggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    background-color: var(--card-bg);
    box-shadow: 0 2px 8px var(--shadow-color);
}

#themeToggle svg {
    width: 24px;
    height: 24px;
    fill: var(--text-color);
}

.sun-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
}

h1, h3 {
    text-align: center;
    margin-bottom: 2rem;
    font-weight: 600;
}

h3 {
    margin: 1.5rem 0 1rem;
    font-size: 1.2rem;
}

.input-section {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 18px;
    box-shadow: 0 2px 12px var(--shadow-color);
}

textarea {
    width: 100%;
    height: 200px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    resize: vertical;
    font-size: 16px;
    margin-bottom: 1rem;
    transition: border-color 0.2s ease;
    background-color: var(--card-bg);
    color: var(--text-color);
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.file-upload {
    margin-bottom: 1rem;
}

.file-upload input[type="file"] {
    display: none;
}

.file-upload label {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--secondary-bg);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    color: var(--text-color);
}

.file-upload label:hover {
    background-color: var(--secondary-hover);
}

.word-stats, .stopwords-section {
    background-color: var(--secondary-bg);
    padding: 1rem;
    border-radius: 12px;
    margin: 1rem 0;
}

.word-stats-header {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.5rem;
    padding: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
}

.word-stats-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

.word-stat-item {
    background-color: var(--card-bg);
    padding: 0.8rem;
    border-radius: 8px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    align-items: center;
}

.word-stat-item .word {
    font-weight: 500;
}

.word-stat-item .count {
    color: var(--primary-color);
    font-weight: 600;
}

.stopwords-tip {
    color: var(--text-color);
    opacity: 0.8;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-align: center;
}

.stopwords-input {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.stopwords-input input {
    flex: 1;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.stopwords-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.stopword-tag {
    background-color: var(--card-bg);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stopword-tag button {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0;
    font-size: 1.2rem;
    line-height: 1;
}

.buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

button {
    flex: 1;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

#generateBtn, #addStopword {
    background-color: var(--primary-color);
    color: white;
}

#generateBtn:hover, #addStopword:hover {
    background-color: var(--primary-hover);
}

#resetBtn, #saveBtn {
    background-color: var(--secondary-bg);
    color: var(--text-color);
}

#resetBtn:hover, #saveBtn:hover {
    background-color: var(--secondary-hover);
}

.wordcloud-container {
    margin-top: 2rem;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 18px;
    box-shadow: 0 2px 12px var(--shadow-color);
    min-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .buttons {
        flex-direction: column;
    }
    
    .word-stats-list {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}

.textarea-container {
    position: relative;
    margin-bottom: 1rem;
}

.char-count {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-color);
    opacity: 0.6;
}

.analysis-section {
    margin-top: 2rem;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 18px;
    box-shadow: 0 2px 12px var(--shadow-color);
}

.analysis-section h3:first-child {
    margin-top: 0;
}

#analyzeBtn {
    background-color: var(--secondary-bg);
    color: var(--text-color);
}

#analyzeBtn:hover {
    background-color: var(--secondary-hover);
}

#analyzeBtn.active {
    background-color: var(--primary-color);
    color: white;
}