/* === ПЕРЕМЕННЫЕ ТЕМЫ === */
:root {
    --transition: 0.25s ease;
    --radius: 14px;
    --radius-sm: 8px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "SF Pro Display", Roboto, Helvetica, Arial, sans-serif;
}

/* Темная тема (по умолчанию) */
[data-theme="dark"] {
    --bg: #0f1419;
    --bg-secondary: #1a1f29;
    --bg-card: #1e2532;
    --bg-input: #141923;
    --bg-hover: #252b3a;
    --border: #2d3548;
    --border-focus: #4a7cff;
    --text: #e8ecf3;
    --text-secondary: #9aa5b8;
    --text-muted: #6b7585;
    --accent: #4a7cff;
    --accent-hover: #5d8aff;
    --accent-glow: rgba(74, 124, 255, 0.25);
    --success: #4ade80;
    --error: #ef4444;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
}

/* Светлая тема */
[data-theme="light"] {
    --bg: #f5f7fb;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-input: #f5f7fb;
    --bg-hover: #eef1f7;
    --border: #e1e5ed;
    --border-focus: #4a7cff;
    --text: #1a1f29;
    --text-secondary: #5a6478;
    --text-muted: #8893a8;
    --accent: #4a7cff;
    --accent-hover: #2563eb;
    --accent-glow: rgba(74, 124, 255, 0.2);
    --success: #16a34a;
    --error: #dc2626;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.05);
}

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

html {
    height: 100%;
}

body {
    min-height: 100vh;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--transition), color var(--transition);
}

/* Декоративный градиент фона */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 30%, var(--accent-glow), transparent 40%),
        radial-gradient(circle at 80% 70%, var(--accent-glow), transparent 40%);
    opacity: 0.4;
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px 32px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === HEADER === */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.4rem;
}

.logo-icon {
    font-size: 1.8rem;
    animation: rotate 20s linear infinite;
    display: inline-block;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.header-controls {
    display: flex;
    gap: 10px;
    align-items: center;
}

.api-selector {
    padding: 8px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    cursor: pointer;
    font-size: 0.9rem;
    font-family: inherit;
    transition: all var(--transition);
}

.api-selector:hover {
    border-color: var(--accent);
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

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

/* === MAIN === */
.main {
    flex: 1;
}

.translator-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all var(--transition);
}

/* === LANG BAR === */
.lang-bar {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 12px;
    padding: 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    align-items: center;
}

.lang-select {
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    width: 100%;
}

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

.lang-select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.swap-btn {
    width: 44px;
    height: 44px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--bg-card);
    color: var(--accent);
    font-size: 1.3rem;
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

.swap-btn:hover {
    background: var(--accent);
    color: white;
    transform: rotate(180deg);
    border-color: var(--accent);
}

/* === TEXTAREA === */
.textarea-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.textarea-wrap {
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
}

.textarea-wrap:last-child {
    border-right: none;
}

.textarea {
    width: 100%;
    min-height: 560px;
    padding: 24px;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 1.05rem;
    font-family: inherit;
    line-height: 1.6;
    resize: none; /* отключено: высоту автоматически меняет JS */
    overflow-y: hidden; /* скрываем скроллбар, поле само растёт */
    transition: background var(--transition);
}

.textarea::placeholder {
    color: var(--text-muted);
}

.textarea:focus {
    outline: none;
    background: var(--bg-input);
}

.textarea-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-height: 44px;
}

.char-count {
    font-variant-numeric: tabular-nums;
}

.char-count.warning {
    color: var(--error);
    font-weight: 600;
}

.detected-lang {
    color: var(--text-muted);
    font-style: italic;
}

.text-btn {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.85rem;
    font-family: inherit;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all var(--transition);
}

.text-btn:hover:not(:disabled) {
    background: var(--accent-glow);
}

.text-btn:disabled {
    color: var(--text-muted);
    cursor: not-allowed;
}

/* === TRANSLATE BUTTON === */
.translate-bar {
    padding: 20px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.translate-btn {
    padding: 14px 48px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    min-width: 200px;
    position: relative;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.translate-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.translate-btn:active:not(:disabled) {
    transform: translateY(0);
}

.translate-btn:disabled {
    opacity: 0.6;
    cursor: wait;
}

.btn-spinner {
    display: inline-block;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.status {
    min-height: 20px;
    font-size: 0.9rem;
    text-align: center;
}

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

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

/* === HONEYPOT === */
.honeypot {
    position: absolute;
    left: -9999px;
    top: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
}

/* === ИСТОРИЯ === */
.history-card {
    margin-top: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.history-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.history-list {
    max-height: 600px;
    overflow-y: auto;
}

.history-item {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background var(--transition);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
    align-items: center;
}

.history-item:last-child {
    border-bottom: none;
}

.history-item:hover {
    background: var(--bg-hover);
}

.history-content {
    overflow: hidden;
}

.history-text {
    color: var(--text);
    font-size: 0.92rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-translation {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-meta {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-align: right;
    white-space: nowrap;
}

.history-delete {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 4px 8px;
    opacity: 0;
    transition: all var(--transition);
}

.history-item:hover .history-delete {
    opacity: 1;
}

.history-delete:hover {
    color: var(--error);
}

/* === FOOTER === */
.footer {
    margin-top: 32px;
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.separator {
    margin: 0 8px;
    opacity: 0.5;
}

/* === АНИМАЦИИ === */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.history-item {
    animation: fadeIn 0.3s ease;
}

/* === АДАПТИВНОСТЬ === */
@media (max-width: 768px) {
    .container {
        padding: 16px 12px;
    }
    
    .header {
        margin-bottom: 20px;
    }
    
    .logo-text {
        font-size: 1.1rem;
    }
    
    .lang-bar {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .swap-btn {
        transform: rotate(90deg);
        margin: 0 auto;
    }
    
    .swap-btn:hover {
        transform: rotate(270deg);
    }
    
    .textarea-grid {
        grid-template-columns: 1fr;
    }
    
    .textarea-wrap {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    
    .textarea-wrap:last-child {
        border-bottom: none;
    }
    
    .textarea {
        min-height: 360px;
        font-size: 1rem;
    }
    
    .translate-btn {
        width: 100%;
        min-width: unset;
    }
    
    .footer {
        font-size: 0.8rem;
    }
    
    .separator {
        display: block;
        height: 4px;
        opacity: 0;
    }
}

@media (max-width: 480px) {
    .header-controls {
        width: 100%;
    }
    
    .api-selector {
        flex: 1;
    }
}

/* === СКРОЛЛБАР === */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}