src/app.css

:root {
    --primary: #ffffff;
    --primary-hover: #e2e8f0;
    --bg-main: #000000;
    --bg-card: #0a0a0a;
    --border: #1f1f1f;
    --text-main: #ffffff;
    --text-muted: #888888;
    --accent: #ffffff;
    --input-bg: #050505;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Times New Roman', 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
}

#app {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
}

.app-container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

header {
    text-align: center;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

p.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    transition: border-color 0.3s ease;
}

.card:hover {
    border-color: #333;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
}

.card-title {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-main);
}

textarea {
    width: 100%;
    height: 450px;
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 1.5rem;
    color: var(--text-main);
    font-size: 1rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    transition: border-color 0.3s ease;
}

textarea:focus {
    border-color: #555;
}

.preview-area {
    width: 100%;
    height: 450px;
    background-color: #FFFFFF !important;
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 2.5rem;
    overflow-y: auto;
    color: #000000 !important;
    font-family: 'Times New Roman', Times, serif;
}

.preview-area * {
    color: #000000 !important;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 0;
    border: 1px solid var(--text-main);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 0.75rem;
}

.btn-primary {
    background-color: var(--text-main);
    color: var(--bg-main);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--text-main);
}

.btn-primary:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-outline {
    background-color: transparent;
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--text-main);
    color: var(--bg-main);
}

.config-panel {
    margin-top: 0;
    display: flex;
    gap: 1rem;
    align-items: center;
    padding: 1rem;
    background: #050505;
    border: 1px solid var(--border);
}

.input-field {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 0.75rem 1rem;
    color: var(--text-main);
    flex-grow: 1;
    font-size: 0.75rem;
    outline: none;
}

.input-field:focus {
    border-color: #555;
}

.doc-type-toggle {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
}

.toggle-btn {
    flex: 1;
    padding: 0.75rem;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.3s ease;
}

.toggle-btn.active {
    background: var(--text-main);
    color: var(--bg-main);
}

.toggle-btn:hover:not(.active) {
    background: rgba(255, 255, 255, 0.05);
}

/* Preview Styles */
.preview-h1 {
    font-size: 11pt;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: #000000;
    padding: 0.5rem 1rem;
    border-bottom: 2px solid #000000;
}

.preview-h2 {
    font-size: 11pt;
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 1.25rem;
    color: var(--text-main);
}

.preview-h3 {
    font-size: 11pt;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.preview-p {
    margin-bottom: 0.75rem;
    line-height: 1.4;
    color: #000000 !important;
    font-size: 11pt;
}

.preview-li {
    margin-bottom: 0.75rem;
    color: #000000 !important;
    line-height: 1.6;
}

/* Skeleton Loader */
.skeleton-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skeleton {
    background: linear-gradient(90deg, #0a0a0a 25%, #1a1a1a 50%, #0a0a0a 75%);
    background-size: 200% 100%;
    animation: loading 2s infinite;
}

.skeleton-h1 {
    height: 3rem;
    width: 70%;
}

.skeleton-h2 {
    height: 2rem;
    width: 50%;
    margin-top: 1rem;
}

.skeleton-p {
    height: 1.25rem;
    width: 100%;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    h1 {
        font-size: 2.5rem;
    }
}