:root {
    --bg-color: #1e1e1e;
    --panel-bg-color: #2d2d2d;
    --border-color: #4a4a4a;
    --text-color: #e0e0e0;
    --label-color: #b0b0b0;
    --primary-color: #007acc;
    --success-color: #4caf50;
    --error-color: #f44336;
    --interim-color: #999;
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* 移除預設捲軸樣式，美化 */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: #555;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #666;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 24px;
    display: flex;
    flex-direction: column;
    height: 100vh;
    box-sizing: border-box;
    font-size: 16px;
}

h1 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 32px;
    font-size: 2.4em;
    font-weight: 300;
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.main-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 24px;
    flex-grow: 1;
    min-height: 0;
}

.panel {
    background-color: var(--panel-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    /* 改為 hidden，由內部元素自行捲動 */
}

#control-panel {
    overflow-y: auto;
    /* 控制面板本身可以捲動 */
}

.panel h2 {
    margin-top: 0;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 16px;
    margin-bottom: 24px;
    font-size: 1.5em;
    font-weight: 500;
    flex-shrink: 0;
    color: #ffffff;
    /* 防止標題被壓縮 */
}

.panel h3 {
    font-size: 1.1em;
    font-weight: 500;
    color: var(--label-color);
    margin-top: 20px;
    margin-bottom: 15px;
}

.control-group {
    margin-bottom: 18px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 1em;
    color: var(--label-color);
    font-weight: 400;
}

.control-group label.inline-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-right: 20px;
}

.control-group input[type="text"],
.control-group input[type="password"],
.control-group input[type="number"],
.control-group select,
.control-group textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: #3c3c3c;
    color: var(--text-color);
    box-sizing: border-box;
    font-size: 1em;
}

.control-group input:disabled,
.control-group select:disabled,
.control-group textarea:disabled {
    background-color: #333;
    opacity: 0.5;
    cursor: not-allowed;
}

.control-group textarea {
    resize: vertical;
    min-height: 80px;
}

.language-selects {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

#translationModeSelector {
    border: 1px solid var(--border-color);
    padding: 10px 15px;
    border-radius: 8px;
}

/* ** [修正1] ** 按鈕與狀態列的容器 */

.controls-footer {
    margin-top: auto;
    /* 這會將此區塊推至 flex 容器底部 */
    padding-top: 20px;
    /* 增加與上方內容的間距 */
    flex-shrink: 0;
}

#startStopBtn {
    width: 100%;
    padding: 14px;
    border-radius: 6px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    font-size: 1.1em;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

#startStopBtn:hover {
    opacity: 0.9;
}

#startStopBtn:active {
    transform: scale(0.98);
}

#startStopBtn:disabled {
    background-color: #555;
    cursor: not-allowed;
}

#startStopBtn.recording {
    background-color: var(--error-color);
}

.status-container {
    display: flex;
    align-items: center;
    margin-top: 20px;
    gap: 12px;
    min-height: 24px;
    flex-wrap: wrap;
}

#statusIndicator {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: #6c757d;
    transition: background-color 0.3s;
}

#statusIndicator.connected {
    background-color: var(--success-color);
}

#statusIndicator.error {
    background-color: var(--error-color);
}

#volumeMeter {
    flex: 1;
    min-width: 60px;
    height: 8px;
    background-color: #3c3c3c;
    border-radius: 4px;
    overflow: hidden;
}

#volumeLevel {
    width: 0%;
    height: 100%;
    background-color: var(--success-color);
    transition: width 0.1s linear;
}

/* ** [修正2] ** 結果呈現區塊的佈局 */
.result-display-area {
    display: flex;
    flex-direction: column;
    gap: 20px;
    flex-grow: 1;
    /* 佔滿 panel 剩餘空間 */
    min-height: 0;
    /* 讓 flex-grow 生效的關鍵 */
}

.result-display-area .output-container {
    display: flex;
    flex-direction: column;
    min-height: 0;
    flex-grow: 1;
    /* 預設佔滿 */
    flex-basis: 0;
    /* 讓 flex-grow 可以均分空間 */
}

.output-panel {
    height: 100%;
    font-size: 1.4em;
    line-height: 1.8;
    overflow-y: auto;
    padding: 20px;
    box-sizing: border-box;
    background-color: #252525;
    border-radius: 8px;
    font-weight: 500;
}

.output-panel p {
    margin-top: 0;
    margin-bottom: 1em;
    word-spacing: 0.1em;
    letter-spacing: 0.02em;
}

.output-panel .interim {
    color: var(--interim-color);
    opacity: 0.8;
    font-style: italic;
    background: rgba(153, 153, 153, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
}

.output-panel .unchecked {
    color: #999;
    opacity: 0.7;
}

.output-panel .checked {
    color: var(--text-color);
    opacity: 1;
}


.error-message {
    color: var(--error-color);
    padding: 12px;
    background-color: rgba(244, 67, 54, 0.1);
    border: 1px solid var(--error-color);
    border-radius: 6px;
    margin-bottom: 15px;
    text-align: center;
}

.hidden {
    display: none !important;
}

/* ====== RESPONSIVE DESIGN ====== */

/* Tablet and large mobile landscape */
@media (max-width: 1024px) {
    body {
        padding: 16px;
    }
    
    h1 {
        font-size: 2em;
        margin-bottom: 24px;
    }
    
    .main-container {
        gap: 16px;
    }
    
    .panel {
        padding: 20px;
    }
}

/* Mobile and small tablets */
@media (max-width: 768px) {
    body {
        padding: 12px;
        height: auto;
        min-height: 100vh;
    }
    
    h1 {
        font-size: 1.8em;
        margin-bottom: 20px;
        text-align: center;
    }
    
    .main-container {
        grid-template-columns: 1fr;
        gap: 16px;
        flex-grow: unset;
    }
    
    .panel {
        padding: 16px;
        border-radius: 8px;
    }
    
    .panel h2 {
        font-size: 1.3em;
        margin-bottom: 20px;
        padding-bottom: 12px;
    }
    
    .panel h3 {
        font-size: 1.05em;
        margin-top: 16px;
        margin-bottom: 12px;
    }
    
    .control-group {
        margin-bottom: 16px;
    }
    
    .control-group input[type="text"],
    .control-group input[type="password"],
    .control-group input[type="number"],
    .control-group select,
    .control-group textarea {
        padding: 12px;
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    .control-group textarea {
        min-height: 70px;
    }
    
    .control-group label.inline-label {
        margin-right: 15px;
        margin-bottom: 8px;
    }
    
    #translationModeSelector {
        padding: 12px;
    }
    
    .controls-footer {
        padding-top: 16px;
    }
    
    #startStopBtn {
        padding: 16px;
        font-size: 1.1em;
    }
    
    .status-container {
        margin-top: 16px;
        gap: 10px;
        justify-content: space-between;
    }
    
    #statusIndicator {
        width: 16px;
        height: 16px;
    }
    
    #volumeMeter {
        min-width: 80px;
        height: 6px;
    }
    
    .result-display-area {
        gap: 16px;
    }
    
    .output-panel {
        font-size: 1.2em;
        line-height: 1.6;
        padding: 16px;
        min-height: 300px;
    }
    
    /* Make result panels stack better on mobile */
    .result-display-area .output-container {
        min-height: 300px;
    }
}

/* Small mobile phones */
@media (max-width: 480px) {
    body {
        padding: 8px;
        font-size: 14px;
    }
    
    h1 {
        font-size: 1.6em;
        margin-bottom: 16px;
    }
    
    .main-container {
        gap: 12px;
    }
    
    .panel {
        padding: 12px;
        border-radius: 6px;
    }
    
    .panel h2 {
        font-size: 1.2em;
        margin-bottom: 16px;
        padding-bottom: 10px;
    }
    
    .panel h3 {
        font-size: 1em;
        margin-top: 14px;
        margin-bottom: 10px;
    }
    
    .control-group {
        margin-bottom: 14px;
    }
    
    .control-group input[type="text"],
    .control-group input[type="password"],
    .control-group input[type="number"],
    .control-group select,
    .control-group textarea {
        padding: 10px;
        font-size: 16px;
    }
    
    .control-group textarea {
        min-height: 60px;
    }
    
    .control-group label {
        font-size: 0.95em;
        margin-bottom: 6px;
    }
    
    .control-group label.inline-label {
        display: block;
        margin-right: 0;
        margin-bottom: 10px;
    }
    
    #translationModeSelector {
        padding: 10px;
    }
    
    #translationModeSelector label.inline-label {
        display: flex;
        align-items: center;
        margin-bottom: 8px;
        font-size: 0.95em;
    }
    
    .controls-footer {
        padding-top: 12px;
    }
    
    #startStopBtn {
        padding: 14px;
        font-size: 1.05em;
    }
    
    .status-container {
        margin-top: 12px;
        gap: 8px;
        flex-direction: column;
        align-items: stretch;
    }
    
    .status-container > * {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    
    #statusIndicator {
        width: 14px;
        height: 14px;
        flex-shrink: 0;
    }
    
    #volumeMeter {
        min-width: auto;
        flex: 1;
        height: 6px;
    }
    
    .result-display-area {
        gap: 12px;
    }
    
    .output-panel {
        font-size: 1.1em;
        line-height: 1.5;
        padding: 12px;
        min-height: 250px;
    }
    
    .result-display-area .output-container {
        min-height: 250px;
    }
    
    /* Better touch targets */
    input[type="checkbox"],
    input[type="radio"] {
        transform: scale(1.2);
        margin-right: 6px;
    }
}