:root {
    --color-bg: #ffffff;
    --color-surface: #f5f5f5;
    --color-border: #d0d0d0;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-accent: #0066cc;
    --color-accent-hover: #0052a3;
    --color-error: #cc0000;
    --color-success: #007700;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-xs: 12px;
    --font-size-editor: 18px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --border-radius: 4px;
    --max-width: 900px;
    --header-height: 60px;
    --footer-height: 48px;
    --control-bar-height: 48px;
    --status-height: 32px;
}

[data-theme="dark"] {
    --color-bg: #1a1a1a;
    --color-surface: #2a2a2a;
    --color-border: #404040;
    --color-text: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-accent: #4da6ff;
    --color-accent-hover: #80c0ff;
}

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

html {
    font-size: var(--font-size-base);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.product-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

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

.language-selector {
    position: relative;
    display: flex;
    gap: var(--spacing-xs);
}

.language-search {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-small);
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
    width: 200px;
}

.language-search:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

.language-dropdown {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-small);
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
    width: 200px;
}

.language-dropdown:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

.theme-toggle {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-small);
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
}

.theme-toggle:hover {
    background-color: var(--color-surface);
}

.theme-toggle:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg) 0;
    gap: var(--spacing-md);
}

.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 300px;
}

.editor {
    flex: 1;
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-editor);
    font-family: inherit;
    line-height: 1.6;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
    resize: vertical;
    min-height: 300px;
}

.editor:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

.editor::placeholder {
    color: var(--color-text-secondary);
}

.interim-text {
    min-height: 24px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    font-style: italic;
}

.interim-text:empty::before {
    content: '\00a0';
}

.control-bar {
    display: flex;
    gap: var(--spacing-sm);
    min-height: var(--control-bar-height);
    align-items: center;
    flex-wrap: wrap;
}

.control-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-small);
    font-family: inherit;
    font-weight: 500;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
}

.control-button:hover:not(:disabled) {
    background-color: var(--color-surface);
}

.control-button:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

.control-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.control-button.primary {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: #ffffff;
}

.control-button.primary:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
}

.control-button.listening {
    background-color: var(--color-error);
    border-color: var(--color-error);
}

.control-button.listening:hover:not(:disabled) {
    background-color: #aa0000;
}

.control-button.small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.word-target-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.word-target-label {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

.word-target-input {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-small);
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
    width: 100px;
}

.word-target-input:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

.word-target-input::-webkit-outer-spin-button,
.word-target-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.word-target-input[type=number] {
    -moz-appearance: textfield;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: var(--status-height);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.status-line {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

.status-line.error {
    color: var(--color-error);
}

.status-line.listening {
    color: var(--color-success);
}

.stats-display {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.footer {
    height: var(--footer-height);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.author {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

.author a {
    color: var(--color-text-secondary);
    text-decoration: none;
}

.author a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.author a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.footer-links a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

@media (max-width: 600px) {
    .header {
        flex-direction: column;
        height: auto;
        padding: var(--spacing-md) 0;
        gap: var(--spacing-md);
    }

    .header-controls {
        flex-direction: column;
        width: 100%;
    }

    .language-selector {
        width: 100%;
        flex-direction: column;
    }

    .language-search,
    .language-dropdown {
        width: 100%;
    }

    .control-bar {
        flex-wrap: wrap;
    }

    .control-button {
        flex: 1 1 auto;
        min-width: 80px;
    }

    .word-target-bar {
        flex-wrap: wrap;
    }

    .word-target-input {
        flex: 1;
        min-width: 80px;
    }

    .status-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}