:root {
    --primary-color: #0d6efd;
    --primary-hover: #0b5ed7;
    --bg-light: #f8fafc;
    --card-border: #e2e8f0;
    --text-main: #1e293b;
    --text-muted: #64748b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

.card {
    border: 1px solid var(--card-border);
    border-radius: 12px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
    background-color: #ffffff;
}

.card-header {
    background-color: #ffffff;
    border-bottom: 1px solid var(--card-border);
    font-weight: 600;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 8px;
    font-weight: 500;
    padding: 0.5rem 1.25rem;
}

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

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 8px;
}

.navbar {
    background-color: #ffffff !important;
    border-bottom: 1px solid var(--card-border);
}

.tool-card {
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
    color: inherit;
}

.tool-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.tool-icon-free {
    background-color: #e0f2fe;
    color: #0284c7;
}

.tool-icon-premium {
    background-color: #fef3c7;
    color: #d97706;
}

.badge-premium {
    background-color: #fef3c7;
    color: #b45309;
    border: 1px solid #fde68a;
    font-weight: 600;
}

.badge-free {
    background-color: #f1f5f9;
    color: #475569;
    border: 1px solid #e2e8f0;
    font-weight: 600;
}

.drop-zone {
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    background-color: #f8fafc;
    cursor: pointer;
    transition: border-color 0.2s, background-color 0.2s;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary-color);
    background-color: #eff6ff;
}

.sidebar {
    background-color: #ffffff;
    border-right: 1px solid var(--card-border);
    min-height: calc(100vh - 56px);
}

.sidebar .nav-link {
    color: #475569;
    padding: 0.65rem 1rem;
    border-radius: 8px;
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    color: var(--primary-color);
    background-color: #eff6ff;
}

.table th {
    font-weight: 600;
    color: #64748b;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--card-border);
}