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

:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f6f8;
    --bg-tertiary: #e9ecef;
    --text-primary: #27272a;
    --text-secondary: #52525b;
    --text-tertiary: #71717a;
    --border-color: #e4e4e7;
    --accent-color: #5c7cfa;
    --accent-hover: #4c6ef5;
    --header-bg: #ffffff;
    --shadow: rgba(0, 0, 0, 0.05);
    --tooltip-bg: #27272a;
    --tooltip-text: #ffffff;
}

body.dark-theme {
    /* Dark theme colors */
    --bg-primary: #1a1a1a;
    --bg-secondary: #262626;
    --bg-tertiary: #2d2d2d;
    --text-primary: #fafafa;
    --text-secondary: #d4d4d8;
    --text-tertiary: #a1a1aa;
    --border-color: #3f3f46;
    --accent-color: #748ffc;
    --accent-hover: #91a7ff;
    --header-bg: #1a1a1a;
    --shadow: rgba(0, 0, 0, 0.3);
    --tooltip-bg: #fafafa;
    --tooltip-text: #1a1a1a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-primary);
    box-shadow: 0 1px 3px var(--shadow);
    position: relative;
    transition: background-color 0.3s ease;
}

.loading-indicator {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    opacity: 0.98;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-content {
    text-align: center;
}

.loading-content p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 20px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

header {
    background: var(--header-bg);
    color: var(--text-primary);
    padding: 16px 32px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-content {
    flex: 1;
}

header h1 {
    font-size: 1.25rem;
    margin-bottom: 2px;
    font-weight: 600;
    color: var(--text-primary);
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.header-controls {
    display: flex;
    gap: 8px;
    align-items: center;
}

.theme-toggle,
.lang-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.theme-toggle:hover,
.lang-toggle:hover {
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

.theme-toggle:active,
.lang-toggle:active {
    transform: translateY(0);
}

.theme-icon,
.lang-icon {
    font-size: 1rem;
}

.controls-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 8px;
    padding: 8px 32px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.control-section h3 {
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.control-section-compact {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.compact-control h3 {
    font-size: 0.65rem;
    margin-bottom: 3px;
}

.radio-group, .checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0px;
}

.radio-group label, .checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 2px 8px;
    border-radius: 4px;
    transition: background 0.2s;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.radio-group label:hover, .checkbox-group label:hover {
    background: var(--bg-tertiary);
}

input[type="radio"], input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
    width: 16px;
    height: 16px;
    accent-color: var(--accent-color);
}

select {
    width: 100%;
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.8rem;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

select:hover {
    border-color: var(--accent-color);
}

select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(92, 124, 250, 0.1);
}

.main-content {
    padding: 32px;
}

.input-section {
    margin-bottom: 32px;
}

.results-container {
    display: grid;
    grid-template-columns: 1fr 1px 320px;
    gap: 0;
    margin-bottom: 32px;
    position: relative;
}

.output-section {
    width: 100%;
    padding-right: 12px;
}

.vocabulary-section {
    width: 100%;
    grid-column: 1 / -1;
}

.resize-handle {
    width: 1px;
    background: var(--border-color);
    cursor: col-resize;
    position: relative;
    transition: background 0.2s;
    user-select: none;
}

.resize-handle:hover {
    background: var(--accent-color);
}

.resize-handle::before {
    content: '';
    position: absolute;
    top: 0;
    left: -2px;
    right: -2px;
    bottom: 0;
}

.notes-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    height: fit-content;
    position: sticky;
    top: 20px;
    padding-left: 12px;
    min-width: 200px;
}

.input-section h3, .output-section h3, .vocabulary-section h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-weight: 600;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.section-header h3 {
    margin-bottom: 0;
}

.font-size-controls {
    display: flex;
    gap: 4px;
}

.font-btn {
    padding: 4px 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.font-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.font-btn:active {
    transform: translateY(0);
}

#chinese-input {
    width: 100%;
    min-height: 140px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1.25rem;
    font-family: 'KaiTi', 'STKaiti', 'BiauKai', 'DFKai-SB', 'Kaiti SC', 'Microsoft YaHei', 'SimHei', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    resize: vertical;
    transition: all 0.2s;
}

#chinese-input:hover {
    border-color: var(--accent-color);
}

#chinese-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(92, 124, 250, 0.1);
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.primary-button {
    padding: 10px 24px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

.primary-button:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(92, 124, 250, 0.3);
}

.primary-button:active {
    transform: translateY(0);
}

.secondary-button {
    padding: 10px 24px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

.secondary-button:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.secondary-button:active {
    transform: translateY(0);
}

.output-area {
    min-height: 180px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1.5rem;
    line-height: 2.4;
    font-family: 'KaiTi', 'STKaiti', 'BiauKai', 'DFKai-SB', 'Kaiti SC', 'Microsoft YaHei', 'SimHei', Arial, sans-serif;
    transition: all 0.3s ease;
}

.output-area.font-small {
    font-size: 1.125rem;
    line-height: 2;
}

.output-area.font-medium {
    font-size: 1.5rem;
    line-height: 2.4;
}

.output-area.font-large {
    font-size: 2rem;
    line-height: 2.8;
}

.output-area.font-xlarge {
    font-size: 2.5rem;
    line-height: 3.2;
}

.placeholder-text {
    color: var(--text-tertiary);
    font-style: italic;
    text-align: center;
    padding: 40px 20px;
    font-size: 0.875rem;
}

.annotated-word {
    position: relative;
    display: inline-block;
    cursor: pointer;
    padding: 2px 2px;
    margin: 0;
    transition: background 0.2s;
    border-radius: 4px;
}

.annotated-word:hover {
    background: rgba(92, 124, 250, 0.1);
}

.annotated-word.unknown {
    opacity: 0.5;
}

.annotated-word.noted {
    background: #fff59d !important;
    border-radius: 4px;
}

body.dark-theme .annotated-word.noted {
    background: #b8942f !important;
}

/* Ruby text for pinyin above characters */
ruby {
    ruby-position: over;
}

rt.pinyin {
    font-size: 0.5em;
    font-family: inherit;
}

.pinyin-only {
    font-family: inherit;
}

.chinese {
    font-family: 'KaiTi', 'STKaiti', 'BiauKai', 'DFKai-SB', 'Kaiti SC', 'Microsoft YaHei', 'SimHei', Arial, sans-serif;
}

.tooltip {
    visibility: hidden;
    position: absolute;
    bottom: 130%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.75rem;
    white-space: normal;
    min-width: 200px;
    max-width: 400px;
    z-index: 1000;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    opacity: 0;
    transition: opacity 0.2s, visibility 0.2s;
    border: 1px solid var(--border-color);
}

.tooltip-header {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
}

.tooltip-header span {
    font-size: 0.7em;
    font-family: inherit;
}

.tooltip-meaning {
    font-size: 0.8rem;
    line-height: 1.5;
    margin-top: 4px;
    opacity: 0.9;
}

.tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--tooltip-bg);
}

.annotated-word:hover .tooltip {
    visibility: visible;
    opacity: 1;
}

.vocabulary-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 12px;
}

.vocab-item {
    padding: 10px 12px;
    background: var(--bg-secondary);
    border-left: 3px solid var(--accent-color);
    border-radius: 4px;
    transition: all 0.2s;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    border-left-width: 3px;
}

.vocab-item:hover {
    transform: translateX(4px);
    box-shadow: 0 2px 8px var(--shadow);
}

.vocab-main {
    line-height: 1.4;
    margin-bottom: 4px;
}

.vocab-header {
    margin-bottom: 6px;
    line-height: 1.3;
}

.vocab-chinese {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'KaiTi', 'STKaiti', 'BiauKai', 'DFKai-SB', 'Kaiti SC', 'Microsoft YaHei', 'SimHei', Arial, sans-serif;
}

.vocab-pinyin {
    font-size: 0.75rem;
    font-weight: 500;
    margin-left: 8px;
    font-family: inherit;
    color: var(--text-secondary);
}

.vocab-meanings {
    margin-bottom: 4px;
}

.vocab-meaning-line {
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.5;
    margin-top: 2px;
    font-family: inherit;
}

.lang-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-right: 6px;
    text-transform: uppercase;
}

.vocab-definition {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    font-family: inherit;
}

.vocab-meta {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    font-family: inherit;
}

/* Notes section styles */
.notes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.notes-header h3 {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0;
}

.clear-notes-btn {
    padding: 4px 12px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.75rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

.clear-notes-btn:hover {
    background: #ef4444;
    color: white;
    border-color: #ef4444;
}

.notes-list {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px;
    max-height: 600px;
    overflow-y: auto;
    min-height: 180px;
}

.note-item {
    padding: 10px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-left: 3px solid #ffd54f;
    border-radius: 4px;
    margin-bottom: 8px;
    transition: all 0.2s;
    cursor: pointer;
    position: relative;
}

.note-item:hover {
    transform: translateX(2px);
    box-shadow: 0 2px 8px var(--shadow);
}

.note-item:last-child {
    margin-bottom: 0;
}

.note-word {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'KaiTi', 'STKaiti', 'BiauKai', 'DFKai-SB', 'Kaiti SC', 'Microsoft YaHei', 'SimHei', Arial, sans-serif;
    margin-bottom: 4px;
}

.note-pinyin {
    font-size: 0.75rem;
    margin-left: 8px;
    color: var(--text-secondary);
}

.note-definition {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-top: 4px;
}

.note-remove {
    position: absolute;
    top: 8px;
    right: 8px;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 2px 6px;
    border-radius: 3px;
    transition: all 0.2s;
    line-height: 1;
}

.note-remove:hover {
    background: #ef4444;
    color: white;
}

.info-section {
    padding: 32px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.info-section h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-weight: 600;
}

.info-section p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

.info-section ul {
    margin-left: 20px;
    margin-bottom: 12px;
}

.info-section li {
    margin-bottom: 6px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.note {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-color);
    padding: 12px 16px;
    border-radius: 6px;
    margin-top: 12px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

a {
    color: var(--accent-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.footer {
    padding: 16px 32px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    text-align: center;
    transition: all 0.3s ease;
}

.footer p {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    margin: 0;
}

.footer a {
    color: var(--accent-color);
    font-weight: 500;
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .header-content {
        width: 100%;
    }
    
    .header-controls {
        align-self: flex-end;
    }

    header h1 {
        font-size: 1.125rem;
    }
    
    .button-group {
        flex-direction: column;
        gap: 8px;
    }
    
    .button-group button {
        width: 100%;
    }

    .controls-panel {
        grid-template-columns: 1fr;
        padding: 16px;
    }

    .main-content {
        padding: 16px;
    }
    
    .results-container {
        grid-template-columns: 1fr !important;
    }
    
    .output-section {
        padding-right: 0;
    }
    
    .resize-handle {
        display: none;
    }
    
    .notes-section {
        position: static;
        order: 2;
        padding-left: 0;
        margin-top: 20px;
    }
    
    .vocabulary-list {
        grid-template-columns: 1fr;
    }
    
    .info-section {
        padding: 16px;
    }
}

/* Print styles */
@media print {
    body {
        background: white;
    }

    .controls-panel, .input-section, .info-section, .footer, .header-controls, .button-group {
        display: none;
    }
    
    header {
        border-bottom: 1px solid #000;
    }

    .container {
        box-shadow: none;
    }

    .output-area {
        border: none;
        background: white;
        color: #000;
    }
}