:root {
    --primary: #1890ff;
    --primary-hover: #40a9ff;
    --text: #333;
    --text-secondary: #666;
    --border: #d9d9d9;
    --bg: #fafafa;
    --card: #fff;
    --danger: #f5222d;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 40px 80px;
}

.header {
    margin-bottom: 24px;
}

.header-title {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
}

.header-subtitle {
    margin: 8px 0 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.section {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.section-title {
    margin: 0 0 12px;
    font-size: 16px;
    font-weight: 600;
}

.radio-group {
    display: grid;
    gap: 12px;
}

.radio-label {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.radio-label:hover {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.1);
}

.radio-label input {
    margin-top: 4px;
}

.radio-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.radio-text strong {
    font-size: 14px;
}

.radio-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

.input-textarea {
    width: 100%;
    min-height: 200px;
    padding: 12px;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.6;
    resize: vertical;
}

.input-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.1);
}

.input-textarea::placeholder {
    color: #999;
}

.input-footer,
.result-footer {
    margin-top: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.char-count {
    font-size: 12px;
    color: var(--text-secondary);
}

.button-group {
    display: flex;
    gap: 10px;
}

.btn-primary,
.btn-secondary {
    height: 38px;
    padding: 0 20px;
    border-radius: 6px;
    border: 1px solid transparent;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-primary:disabled {
    background: #d9d9d9;
    cursor: not-allowed;
}

.btn-secondary {
    background: #fff;
    color: var(--text);
    border-color: var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.result-display {
    border: 1px solid var(--border);
    border-radius: 6px;
    min-height: 200px;
    background: #fff;
    padding: 12px;
    position: relative;
}

.result-empty {
    color: var(--text-secondary);
    font-size: 14px;
}

.result-content {
    white-space: pre-wrap;
    line-height: 1.6;
    font-size: 14px;
    max-height: 400px;
    overflow: auto;
}

.result-loading {
    display: flex;
    gap: 8px;
    align-items: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.loading-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid #ccc;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    min-width: 200px;
    padding: 12px 24px;
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    font-size: 14px;
    border-radius: 4px;
    z-index: 9999;
    animation: fadeInOut 2s ease-in-out;
}

@keyframes fadeInOut {
    0% {
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

.recognition-result {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #f0f7ff;
    border: 1px solid #c6e2ff;
    color: #0b5cad;
    padding: 10px 12px;
    border-radius: 6px;
}

.recognition-switch {
    border: none;
    background: #fff;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 4px;
    padding: 4px 10px;
    cursor: pointer;
}

.recognition-icon {
    font-size: 16px;
}

@media (max-width: 768px) {
    .container {
        padding: 16px 16px 60px;
    }

    .input-textarea {
        min-height: 150px;
    }
}