:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --success-color: #10b981;
    --success-hover: #059669;
    --border-color: #334155;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
}

.container {
    width: 100%;
    max-width: 800px;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
}

main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.upload-section {
    background-color: var(--card-bg);
    border: 2px dashed var(--border-color);
    border-radius: 1rem;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
}

.upload-section:hover,
.upload-section.drag-over {
    border-color: var(--accent-color);
    background-color: rgba(59, 130, 246, 0.05);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-icon {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.sub-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    border: none;
    font-size: 1rem;
}

.button.primary {
    background-color: var(--accent-color);
    color: white;
}

.button.primary:hover {
    background-color: var(--accent-hover);
}

.button.success {
    background-color: var(--success-color);
    color: white;
}

.button.success:hover {
    background-color: var(--success-hover);
}

.options-section {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.options-section h2 {
    grid-column: 1 / -1;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

select,
input[type="text"] {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

select:focus,
input[type="text"]:focus {
    border-color: var(--accent-color);
}

.preview-section {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.preview-section h2 {
    font-size: 1.25rem;
}

#edl-preview {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: 0.5rem;
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
    overflow-x: auto;
    max-height: 300px;
    white-space: pre;
}

.instructions-section {
    margin-top: 1rem;
    padding: 1.5rem;
    background-color: rgba(30, 41, 59, 0.5);
    border-radius: 1rem;
}

.instructions-section h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.instructions-section ol {
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.instructions-section li {
    margin-bottom: 0.5rem;
}

.instructions-section strong {
    color: var(--text-primary);
}

footer {
    text-align: center;
    margin-top: 3rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* File Uploaded State */
.file-uploaded-section {
    width: 100%;
    margin-bottom: 2rem;
    animation: fadeIn 0.3s ease-in-out;
}

.file-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-color);
    font-weight: 500;
}

.file-icon {
    color: var(--primary-color);
}

.button.small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}