:root {
    /* Base Colors - Shared */
    --primary-color: #0061ff;
    --primary-light: #e6f0ff;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --border-radius: 12px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);

    /* Light Theme (Default) */
    --bg-color: #f8f9fa;
    --surface-color: #ffffff;
    --navbar-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-main: #e2e8f0;
    --input-bg: #ffffff;
    --card-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
}

[data-theme="dark"] {
    --bg-color: #020617;
    --surface-color: #0f172a;
    --navbar-bg: #0f172a;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-main: #1e293b;
    --input-bg: #1e293b;
    --primary-light: rgba(0, 97, 255, 0.1);
    --card-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.2);
}

/* Legacy Support / Aliases for existing code */
:root {
    --white: var(--surface-color);
    --dark-color: var(--text-main);
    --gray-light: var(--border-main);
    --gray-text: var(--text-muted);
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.alert {
    padding: 0.75rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
    text-decoration: none;
    font-size: 1rem;
}

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

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

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

.btn-danger {
    background-color: var(--danger);
    color: white;
}

.btn-warning {
    background-color: var(--warning);
    color: white;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-main);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-main);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.breadcrumb-item a {
    text-decoration: none;
    color: var(--primary-color);
}

.breadcrumb-item::after {
    content: "/";
    margin-left: 0.5rem;
}

.breadcrumb-item:last-child::after {
    content: "";
}

.breadcrumb-item.active {
    color: var(--text-muted);
    font-weight: 600;
}