:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #e0e7ff;
    --secondary: #06b6d4;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.header-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.85rem;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, #1e293b 0%, #4f46e5 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.75rem;
}

.header p {
    color: var(--text-muted);
    font-size: 1.125rem;
    max-width: 650px;
    margin: 0 auto;
}

.tabs-nav {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tab-btn {
    border: none;
    background: transparent;
    padding: 0.65rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn.active {
    background: var(--bg-card);
    color: var(--primary);
    box-shadow: var(--shadow);
}

.tab-btn:hover:not(.active) {
    background: rgba(0, 0, 0, 0.04);
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.dropzone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: #fafbfc;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--primary);
    background: #f5f7ff;
}

.dropzone-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.dropzone p {
    font-size: 1rem;
    color: var(--text-main);
    font-weight: 500;
}

.dropzone span {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.file-input {
    display: none;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color 0.2s;
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

textarea.form-control {
    resize: vertical;
    min-height: 150px;
    font-family: 'Courier New', Courier, monospace;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.btn-secondary {
    background: #f1f5f9;
    color: var(--text-main);
}

.btn-secondary:hover {
    background: #e2e8f0;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
}

.output-actions {
    display: flex;
    gap: 0.5rem;
}

.view-switch {
    display: flex;
    background: #f1f5f9;
    padding: 0.25rem;
    border-radius: 8px;
    gap: 0.25rem;
}

.view-switch button {
    border: none;
    background: transparent;
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-muted);
}

.view-switch button.active {
    background: #ffffff;
    color: var(--primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.output-container {
    margin-top: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.raw-markdown-view {
    width: 100%;
    height: 480px;
    padding: 1rem;
    font-family: 'Fira Code', 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    background: #1e1e2e;
    color: #cdd6f4;
    border-radius: 8px;
    border: 1px solid #313244;
    resize: none;
    white-space: pre-wrap;
}

.rendered-html-view {
    width: 100%;
    height: 480px;
    padding: 1.25rem;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow-y: auto;
    font-size: 0.95rem;
    line-height: 1.6;
}

.rendered-html-view h1, .rendered-html-view h2, .rendered-html-view h3 {
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

.rendered-html-view table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.rendered-html-view th, .rendered-html-view td {
    border: 1px solid var(--border);
    padding: 0.5rem 0.75rem;
    text-align: left;
}

.rendered-html-view th {
    background: #f8fafc;
}

.rendered-html-view pre {
    background: #0f172a;
    color: #f8fafc;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
}

.rendered-html-view code {
    background: #e2e8f0;
    color: #dc2626;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.85em;
}

.rendered-html-view pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.history-section {
    margin-top: 3rem;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.history-table th, .history-table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.history-table th {
    background: #f8fafc;
    font-weight: 600;
    color: var(--text-muted);
}

.history-table tr:hover td {
    background: #f8fafc;
}

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #1e293b;
    color: #ffffff;
    padding: 0.85rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 100;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.spinner {
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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