:root {
    --platform-accent: #1e3a5f;
    --platform-accent-light: #2d5a8a;
    --platform-sidebar-end: #152a45;
    --platform-nav-active: #93c5fd;
    --platform-page-bg: #f0f2f5;
    --platform-sidebar-width: 272px;
    --platform-preview-banner-height: 0px;
    --school-students: #0f766e;
    --school-mentors: #1d4ed8;
}

* {
    box-sizing: border-box;
}

body.platform-shell {
    margin: 0;
    font-family: "DM Sans", system-ui, -apple-system, sans-serif;
    background: var(--platform-page-bg);
    color: #1a1d21;
}

body.role-platform {
    --platform-accent: #1e3a5f;
    --platform-accent-light: #2d5a8a;
    --platform-sidebar-end: #0f172a;
    --platform-nav-active: #93c5fd;
    --platform-page-bg: #eef2f7;
}

body.role-school-admin {
    --platform-accent: #0f766e;
    --platform-accent-light: #0d9488;
    --platform-sidebar-end: #134e4a;
    --platform-nav-active: #5eead4;
    --platform-page-bg: #f0fdfa;
}

body.role-teacher {
    --platform-accent: #334155;
    --platform-accent-light: #475569;
    --platform-sidebar-end: #1e293b;
    --platform-nav-active: #cbd5e1;
    --platform-page-bg: #f8fafc;
}

body.role-mentor {
    --platform-accent: #2d5016;
    --platform-accent-light: #3f6b1d;
    --platform-sidebar-end: #1a330c;
    --platform-nav-active: #bef264;
    --platform-page-bg: #f7fee7;
}

body.role-student {
    --platform-accent: #5c3d1e;
    --platform-accent-light: #7c5228;
    --platform-sidebar-end: #3f2a14;
    --platform-nav-active: #fcd34d;
    --platform-page-bg: #faf6f1;
}

.platform-preview-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1100;
    height: var(--platform-preview-banner-height);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fef3c7;
    color: #92400e;
    font-size: 0.8125rem;
    font-weight: 600;
    border-bottom: 1px solid #fcd34d;
}

.platform-layout {
    min-height: 100vh;
    padding-top: var(--platform-preview-banner-height);
}

.platform-sidebar {
    position: fixed;
    top: var(--platform-preview-banner-height);
    left: 0;
    width: var(--platform-sidebar-width);
    height: calc(100vh - var(--platform-preview-banner-height));
    background: linear-gradient(180deg, var(--platform-accent) 0%, var(--platform-sidebar-end) 100%);
    color: #fff;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 1040;
    flex-direction: column;
}

.platform-sidebar-nav {
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - var(--platform-preview-banner-height));
    padding: 1rem 0 1.25rem;
}

.platform-sidebar-brand-block {
    padding: 0.5rem 1.25rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    margin-bottom: 0.5rem;
}

.platform-sidebar-brand {
    display: block;
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: -0.02em;
}

.platform-sidebar-brand:hover {
    color: #fff;
    opacity: 0.9;
}

.platform-sidebar-role {
    font-size: 0.75rem;
    opacity: 0.75;
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.platform-sidebar-user {
    font-size: 0.8125rem;
    opacity: 0.9;
    margin-top: 0.35rem;
}

.platform-sidebar-section {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.55;
    padding: 1rem 1.25rem 0.35rem;
    margin-top: 0.15rem;
}

.platform-sidebar-link {
    display: block;
    color: rgba(255, 255, 255, 0.88);
    text-decoration: none;
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    line-height: 1.35;
    border-left: 3px solid transparent;
    transition: background 0.15s, border-color 0.15s;
}

.platform-sidebar-link:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.platform-sidebar-link.active {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-left-color: var(--platform-nav-active);
    font-weight: 600;
}

.platform-sidebar-footer {
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    margin: 0.5rem 0 0;
}

.platform-main {
    margin-left: 0;
    min-height: calc(100vh - var(--platform-preview-banner-height));
}

@media (min-width: 992px) {
    .platform-main {
        margin-left: var(--platform-sidebar-width);
    }
}

.platform-topbar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.25rem;
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
    box-shadow: inset 0 3px 0 var(--platform-accent);
    position: sticky;
    top: var(--platform-preview-banner-height);
    z-index: 1020;
}

.platform-topbar-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0;
    line-height: 1.3;
}

.platform-menu-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid #d1d5db;
    background: #fff;
    font-size: 0.875rem;
}

.platform-menu-icon {
    display: block;
    width: 1.125rem;
    height: 2px;
    background: currentColor;
    box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}

.platform-content {
    padding: 1.25rem 1.25rem 2rem;
    max-width: 1200px;
}

.platform-offcanvas {
    background: var(--platform-accent);
    color: #fff;
    width: min(300px, 88vw);
}

.platform-offcanvas .btn-close {
    filter: invert(1);
}

.platform-stat-card {
    border: 0;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.platform-stat-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.platform-stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
}

.platform-stat-label {
    font-size: 0.875rem;
    color: #6b7280;
}

.platform-hint-card,
.platform-placeholder-card {
    border: 0;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.platform-placeholder-card {
    border-left: 4px solid var(--platform-accent-light);
}

.platform-settings-card {
    border: 0;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    transition: box-shadow 0.15s, transform 0.15s;
}

.platform-settings-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

.platform-settings-icon {
    font-size: 1.75rem;
    line-height: 1;
    flex-shrink: 0;
}

.platform-settings-form {
    border: 0;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.platform-settings-form .form-control:disabled,
.platform-settings-form .form-select:disabled,
.platform-settings-form .form-check-input:disabled {
    background-color: #f9fafb;
    opacity: 1;
}

.platform-table-card {
    border: 0;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    overflow: hidden;
}

/* Auth */
body.platform-auth-body {
    min-height: 100vh;
    margin: 0;
    font-family: "DM Sans", system-ui, sans-serif;
    background: linear-gradient(145deg, #e8eef5 0%, #f8f9fa 50%, #e8f0f8 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.platform-auth-wrap {
    width: 100%;
    max-width: 420px;
}

.platform-auth-card {
    border: 0;
    border-radius: 1rem;
}

.platform-auth-card .btn-primary {
    background: var(--platform-accent);
    border-color: var(--platform-accent);
}

.platform-auth-card .btn-primary:hover {
    background: var(--platform-accent-light);
    border-color: var(--platform-accent-light);
}

/* Dev / testing banner */
body.platform-shell--dev {
    --platform-preview-banner-height: 38px;
}

.platform-dev-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1100;
    height: var(--platform-preview-banner-height);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.35rem 1rem;
    padding: 0 0.75rem;
    background: linear-gradient(90deg, #7c2d12, #b45309);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.platform-dev-banner a {
    color: #fff;
    text-decoration: none;
    opacity: 0.95;
}

.platform-dev-banner a:hover {
    text-decoration: underline;
    opacity: 1;
}

.platform-dev-banner__label {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.85;
}

.platform-sidebar-link-dev {
    color: #fcd34d !important;
}

.platform-sidebar-link-logout {
    color: #fecaca !important;
}

.platform-topbar-actions .btn-outline-danger {
    border-color: #fca5a5;
    color: #b91c1c;
}

.platform-topbar-actions .btn-outline-danger:hover {
    background: #fef2f2;
}

/* School list pages */
.school-page-hero {
    border: 0;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.school-page-hero__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1.25rem;
    padding: 1.35rem 1.5rem;
    color: #fff;
}

.school-page-hero--students {
    background: linear-gradient(135deg, #0f766e 0%, #115e59 45%, #134e4a 100%);
}

.school-page-hero--mentors {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e3a8a 55%, #1e3a5f 100%);
}

.school-page-hero--default {
    background: linear-gradient(135deg, var(--platform-accent-light), var(--platform-accent));
}

.school-page-hero__title {
    font-size: 1.35rem;
    font-weight: 700;
    margin: 0 0 0.35rem;
    letter-spacing: -0.02em;
}

.school-page-hero__lead {
    max-width: 42rem;
    opacity: 0.92;
    font-size: 0.9375rem;
}

.school-page-hero__stats {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.school-hero-stat {
    min-width: 5.5rem;
    padding: 0.65rem 0.9rem;
    border-radius: 0.75rem;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(6px);
}

.school-hero-stat__value {
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1.1;
}

.school-hero-stat__label {
    font-size: 0.75rem;
    opacity: 0.88;
    margin-top: 0.15rem;
}

.school-page-hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.school-filter-bar {
    border: 0;
    border-radius: 0.9rem;
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}

.school-people-card {
    border: 1px solid #e8edf3;
}

.school-people-table thead th {
    background: #f8fafc;
    border-bottom: 1px solid #e8edf3;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    font-weight: 600;
}

.school-people-table tbody tr:hover {
    background: #f8fbff;
}

.school-person {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.school-avatar {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    flex-shrink: 0;
}

.school-avatar--student {
    background: #ccfbf1;
    color: #115e59;
}

.school-avatar--mentor {
    background: #dbeafe;
    color: #1d4ed8;
}

.school-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}

.school-pill--success { background: #dcfce7; color: #166534; }
.school-pill--warning { background: #fef3c7; color: #92400e; }
.school-pill--muted { background: #f1f5f9; color: #475569; }
.school-pill--info { background: #dbeafe; color: #1d4ed8; }

.school-class-badge,
.school-count-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.55rem;
    border-radius: 0.5rem;
    background: #f1f5f9;
    color: #334155;
    font-size: 0.8125rem;
    font-weight: 600;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.school-empty-state {
    text-align: center;
    padding: 2.5rem 1rem;
}

.school-empty-state__icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.school-empty-state__title {
    color: #64748b;
}

.platform-content {
    max-width: 1280px;
}