:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --box-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.question-box {
    background: var(--box-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px var(--shadow-color);
    padding: 1.5rem;
}

.input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.upload-icon {
    width: 32px;
    height: 32px;
    stroke: var(--primary-color);
    stroke-width: 2;
    fill: none;
}

.preview {
    margin-top: 1rem;
    display: none;
}

.preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
}

.submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    width: 100%;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:disabled {
    background-color: #94a3b8;
    cursor: not-allowed;
    opacity: 0.7;
}

.submit-btn .spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

.submit-btn.loading .spinner {
    display: inline-block;
}

.submit-btn.loading span,
.submit-btn.loading .arrow-icon {
    display: none;
}

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

.arrow-icon {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

.response-area {
    margin-top: 2rem;
    background: var(--box-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px var(--shadow-color);
    padding: 1.5rem;
}

.response-area.hidden {
    display: none;
}

.button-group {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.8rem;
    background-color: #4b5563;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background-color: #374151;
}

.copy-btn .copy-icon {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

.copy-btn.copied {
    background-color: #059669;
}

.clear-btn {
    padding: 0.5rem 1rem;
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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