:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background);
    color: var(--text);
    margin: 0;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

.converter-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 450px;
    box-sizing: border-box;
}

h2 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
}

p.subtitle {
    color: var(--text-muted);
    text-align: center;
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

/* Drag & Drop Zona */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: #fafafa;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--primary);
    background: #f5f3ff;
}

.drop-zone p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.drop-zone span {
    display: block;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

#upload {
    display: none;
}

.file-info {
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 500;
    text-align: center;
    display: none;
    word-break: break-all;
}
.control-group {
    margin-top: 1.5rem;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

select, input[type="range"] {
    width: 100%;
    box-sizing: border-box;
}

select {
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background-color: #fff;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

select:focus {
    border-color: var(--primary);
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

input[type="range"] {
    accent-color: var(--primary);
    margin-top: 0.5rem;
}

button {
    width: 100%;
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.85rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 1.75rem;
    transition: background-color 0.2s, transform 0.1s;
}

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

button:active {
    transform: scale(0.98);
}

.download-wrapper {
    text-align: center;
    margin-top: 1.5rem;
}

#download {
    display: none;
    color: #059669;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.65rem 1.2rem;
    border: 1px solid #10b981;
    border-radius: 6px;
    background-color: #ecfdf5;
    transition: all 0.2s;
}

#download:hover {
    background-color: #d1fae5;
}
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.tool-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.25rem 1rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    background: #fafafa;
    transition: all 0.2s ease;
}

.tool-card:hover {
    border-color: var(--primary);
    background: #f5f3ff;
    transform: translateY(-2px);
}

.tool-card span.format-badge {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    background: #eef2ff;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.tool-card h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}