:root {
    --color-primary: #2F6F62;
    --color-primary-dark: #1F4D44;
    --color-primary-light: #E8F3F0;
    --color-accent: #F2A93B;
    --color-accent-dark: #E08E1F;
    --color-danger: #E76F51;
    --color-bg: #F5F7F6;
    --color-card: #FFFFFF;
    --color-text: #1F2937;
    --color-muted: #6B7280;
    --color-border: #E5E7EB;
    --radius: 14px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(16, 24, 40, 0.06);
    --shadow-md: 0 8px 24px rgba(16, 24, 40, 0.10);
    --font: 'Segoe UI', 'Trebuchet MS', system-ui, -apple-system, sans-serif;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font);
}

main {
    flex: 1;
}

a {
    color: var(--color-primary);
}

h1, h2, h3, h4, h5 {
    color: var(--color-text);
    font-weight: 700;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: .75rem;
}

.page-header h2 {
    margin: 0;
}

/* Navbar */
.navbar-app {
    background: linear-gradient(100deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    box-shadow: var(--shadow-sm);
}

.navbar-app .navbar-brand {
    color: #fff !important;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: .5rem;
    font-size: 1.15rem;
}

.navbar-app .nav-link {
    color: rgba(255,255,255,0.88) !important;
    font-weight: 600;
    border-radius: var(--radius-sm);
    padding: .4rem .75rem !important;
    transition: background-color .15s ease, color .15s ease;
}

.navbar-app .nav-link:hover {
    background-color: rgba(255,255,255,0.14);
    color: #fff !important;
}

.navbar-app .nav-link.btn-link {
    text-decoration: none;
}

/* Cards */
.card {
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.surface {
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 1.75rem;
}

/* Stat tiles */
.stat-tile {
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-tile .stat-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    color: var(--color-primary);
    flex-shrink: 0;
}

.stat-tile .stat-value {
    font-size: 1.9rem;
    font-weight: 800;
    line-height: 1;
    color: var(--color-text);
}

.stat-tile .stat-label {
    color: var(--color-muted);
    font-size: .85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .03em;
}

/* Buttons */
.btn {
    border-radius: var(--radius-sm);
    font-weight: 600;
}

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

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

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

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

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

.btn-outline-danger {
    color: var(--color-danger);
    border-color: var(--color-danger);
}

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

.btn:focus, .form-control:focus, .form-select:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.2rem rgba(47, 111, 98, 0.2);
    border-color: var(--color-primary);
}

/* Forms */
.form-control, .form-select {
    border-radius: var(--radius-sm);
    border-color: var(--color-border);
}

label, .form-label {
    font-weight: 600;
    color: var(--color-text);
}

/* Tables */
.table {
    background: var(--color-card);
    border-radius: var(--radius);
    overflow: hidden;
}

.table thead th {
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .03em;
    border: none;
    font-weight: 700;
}

.table td, .table th {
    vertical-align: middle;
    border-color: var(--color-border);
}

/* Badges */
.badge {
    font-weight: 600;
    border-radius: 999px;
    padding: .4em .8em;
}

/* Auth pages */
.auth-wrap {
    min-height: calc(100vh - 140px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.auth-shell {
    display: flex;
    width: 100%;
    max-width: 900px;
    background: var(--color-card);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.auth-visual {
    flex: 1;
    background-image: url('/images/school-hero.svg');
    background-size: cover;
    background-position: center;
    min-height: 420px;
    display: none;
}

.auth-form-col {
    flex: 1.1;
    padding: 2.75rem 2.5rem;
}

@media (min-width: 768px) {
    .auth-visual {
        display: block;
    }
}

.auth-card {
    width: 100%;
    max-width: 440px;
    margin: 0 auto;
}

.auth-card h2 {
    color: var(--color-primary-dark);
    margin-bottom: .25rem;
}

.auth-subtitle {
    color: var(--color-muted);
    margin-bottom: 1.5rem;
}

.auth-links {
    margin-top: 1.25rem;
    text-align: center;
    font-size: .92rem;
}

.auth-links a {
    font-weight: 600;
    text-decoration: none;
}

.auth-links a:hover {
    text-decoration: underline;
}

/* Footer */
.footer-app {
    padding: 14px 0;
    background-color: var(--color-card);
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-muted);
    font-size: .875rem;
}