:root {
    --brand-900: #0f172a;
    --brand-800: #1e293b;
    --brand-700: #1e40af;
    --brand-600: #1d4ed8;
    --brand-500: #2563eb;
    --brand-300: #60a5fa;
    --text-900: #1e293b;
    --text-700: #374151;
    --text-500: #64748b;
    --bg-100: #f8fafc;
    --bg-200: #e2e8f0;
    --border-200: #e5e7eb;
    --white: #ffffff;
    --shadow-blue: rgba(37, 99, 235, 0.25);
    --shadow-blue-strong: rgba(37, 99, 235, 0.35);
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    --gradient-primary-hover: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e40af 50%, #2563eb 100%);
    --gradient-section: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
}

body {
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    color: var(--text-700);
    background: var(--gradient-section);
    min-height: 100vh;
}

.navbar {
    background: var(--gradient-primary);
    box-shadow: 0 8px 24px var(--shadow-blue);
}

.navbar .navbar-brand,
.navbar .nav-link,
.navbar .navbar-text {
    color: var(--white) !important;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus {
    color: var(--brand-300) !important;
}

.app-shell {
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--border-200);
    border-radius: 18px;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
    padding: 28px;
}

.app-hero {
    background: var(--gradient-hero);
    color: var(--white);
    border-radius: 18px;
    padding: 32px;
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.25);
}

.app-hero h2 {
    color: var(--white);
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
    box-shadow: 0 8px 18px var(--shadow-blue);
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--gradient-primary-hover);
    box-shadow: 0 10px 22px var(--shadow-blue-strong);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--brand-500);
    color: var(--brand-500);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background: var(--brand-500);
    color: var(--white);
}

.table {
    border-radius: 12px;
    overflow: hidden;
    background: var(--white);
}

.table thead th {
    background: var(--brand-800);
    color: var(--white);
    border: none;
}

.table tbody tr:nth-child(even) {
    background: #f3f6fb;
}

.form-control,
.form-select {
    border-radius: 10px;
    border: 1px solid var(--border-200);
    padding: 8px 12px;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--brand-500);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.2);
}

.card {
    border-radius: 16px;
    border: 1px solid var(--border-200);
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.08);
}

.alert-info {
    background: rgba(96, 165, 250, 0.15);
    border: 1px solid rgba(37, 99, 235, 0.25);
    color: var(--brand-700);
}

.alert-warning {
    background: rgba(251, 191, 36, 0.2);
    border: 1px solid rgba(217, 119, 6, 0.3);
    color: #92400e;
}

.section-title {
    color: var(--text-900);
    font-weight: 600;
}