:root {
    --font-sans: "Space Grotesk", "IBM Plex Sans", "Segoe UI", sans-serif;
    --font-display: "Space Grotesk", "IBM Plex Sans", "Segoe UI", sans-serif;
    --radius-lg: 18px;
    --radius-md: 14px;
    --radius-sm: 10px;
    --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.16);
    --shadow-md: 0 12px 28px rgba(15, 23, 42, 0.12);
    --shadow-sm: 0 6px 16px rgba(15, 23, 42, 0.12);
    --bg-gradient: radial-gradient(circle at 20% 10%, rgba(31, 111, 235, 0.12), transparent 40%),
        radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.12), transparent 45%),
        radial-gradient(circle at 40% 80%, rgba(22, 163, 74, 0.08), transparent 50%);
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-gradient), var(--app-bg);
    min-height: 100vh;
    letter-spacing: 0.1px;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
}

.container-fluid {
    padding: 0 24px 48px;
}

.navbar {
    background: var(--app-navbar-bg) !important;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 0.75rem 1.25rem;
    margin-bottom: 24px;
}

.navbar-brand img {
    filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.15));
}

.navbar .nav-link {
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 999px;
    transition: background 0.2s ease, color 0.2s ease;
}

.navbar .nav-link.active,
.navbar .nav-link:hover {
    background: rgba(31, 111, 235, 0.12);
}

.card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.card-header {
    font-weight: 600;
    letter-spacing: 0.2px;
}

.card-body {
    padding: 1.4rem 1.6rem;
}

.card-title {
    font-size: 1.2rem;
}

.table {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.table thead th {
    font-weight: 600;
    background: rgba(15, 23, 42, 0.04);
    border-bottom: 1px solid var(--app-border);
}

.table td,
.table th {
    vertical-align: middle;
}

.list-group-item {
    border-radius: var(--radius-md);
    margin-bottom: 10px;
    box-shadow: var(--shadow-sm);
}

.btn {
    font-weight: 600;
    border-radius: 999px;
    padding: 0.5rem 1.2rem;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.12);
}

.btn-sm {
    padding: 0.35rem 0.8rem;
}

.form-control,
.form-select {
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.85rem;
}

.badge,
.alert {
    border-radius: var(--radius-sm);
}

.app-hero {
    background: linear-gradient(135deg, rgba(31, 111, 235, 0.12), rgba(124, 58, 237, 0.1));
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 16px;
}

.login-card {
    width: min(420px, 100%);
    backdrop-filter: blur(10px);
}

.theme-toggle {
    box-shadow: none;
}

@media (max-width: 992px) {
    .container-fluid {
        padding: 0 16px 32px;
    }
    .navbar {
        border-radius: 0 0 var(--radius-md) var(--radius-md);
        margin-bottom: 16px;
    }
}

@media (max-width: 768px) {
    .card-body {
        padding: 1.1rem;
    }
    .navbar .nav-link {
        margin: 0.25rem 0;
    }
}