/* OBE LMS - Canvas/Moodle inspired */
:root {
    --lms-primary: #2563eb;
    --lms-primary-dark: #1d4ed8;
    --lms-rail-bg: #1e293b;
    --lms-rail-bg-active: #0f172a;
    --lms-rail-fg: #cbd5e1;
    --lms-rail-fg-active: #ffffff;
    --lms-bg: #f1f5f9;
    --lms-card: #ffffff;
    --lms-border: #e2e8f0;
    --lms-text: #0f172a;
    --lms-muted: #64748b;
    --lms-success: #10b981;
    --lms-warning: #f59e0b;
    --lms-danger: #ef4444;
    --lms-rail-w: 92px;
    --lms-header-h: 64px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--lms-bg);
    color: var(--lms-text);
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; }

.lms-shell {
    display: flex;
    min-height: 100vh;
}

/* ============ Global Icon Rail ============ */
.lms-rail {
    width: var(--lms-rail-w);
    background: var(--lms-rail-bg);
    color: var(--lms-rail-fg);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: sticky;
    top: 0;
    height: 100vh;
    flex-shrink: 0;
}

.lms-rail-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    height: var(--lms-header-h);
    color: #fff;
    font-size: 1.75rem;
    background: var(--lms-rail-bg-active);
}

.lms-rail-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 0.75rem 0;
    gap: 0.25rem;
    overflow-y: auto;
}

.lms-rail-bottom {
    padding: 0.75rem 0;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.lms-rail-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 0.25rem;
    color: var(--lms-rail-fg);
    font-size: 0.7rem;
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: all .15s ease;
    gap: 0.25rem;
}

.lms-rail-link i { font-size: 1.4rem; }

.lms-rail-link:hover {
    color: #fff;
    background: rgba(255,255,255,0.06);
}

.lms-rail-link.active,
.lms-rail-link[aria-current="page"] {
    color: #fff;
    background: var(--lms-rail-bg-active);
    border-left-color: var(--lms-primary);
}

/* ============ Main Column ============ */
.lms-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.lms-header {
    height: var(--lms-header-h);
    background: var(--lms-card);
    border-bottom: 1px solid var(--lms-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.lms-breadcrumb {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--lms-text);
}

.lms-breadcrumb a { color: var(--lms-primary); }

.lms-header-right {
    display: flex;
    align-items: center;
}

.lms-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--lms-primary);
    color: #fff;
    font-weight: 600;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.lms-content {
    padding: 1.75rem 2rem 3rem;
    max-width: 1400px;
    width: 100%;
}

/* ============ Page heading ============ */
.lms-page-title {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.lms-page-title h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    color: var(--lms-text);
}

.lms-page-title .text-muted {
    color: var(--lms-muted) !important;
}

/* ============ Course Cards (Canvas-style) ============ */
.lms-course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.lms-course-card {
    background: var(--lms-card);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
    transition: transform .15s ease, box-shadow .15s ease;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--lms-border);
}

.lms-course-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.lms-course-banner {
    height: 110px;
    background: linear-gradient(135deg, var(--lms-primary) 0%, #7c3aed 100%);
    position: relative;
}

.lms-course-banner.c1 { background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%); }
.lms-course-banner.c2 { background: linear-gradient(135deg, #0891b2 0%, #10b981 100%); }
.lms-course-banner.c3 { background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%); }
.lms-course-banner.c4 { background: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%); }
.lms-course-banner.c5 { background: linear-gradient(135deg, #14b8a6 0%, #2563eb 100%); }

.lms-course-banner .lms-course-code {
    position: absolute;
    bottom: 0.6rem;
    left: 1rem;
    color: #fff;
    font-weight: 700;
    letter-spacing: .5px;
}

.lms-course-body {
    padding: 1rem 1.1rem 1.1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.lms-course-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--lms-text);
    margin-bottom: 0.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.lms-course-meta {
    font-size: 0.8rem;
    color: var(--lms-muted);
    margin-bottom: 0.75rem;
}

.lms-course-footer {
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--lms-muted);
}

/* ============ KPI tiles ============ */
.lms-kpi-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.lms-kpi {
    background: var(--lms-card);
    border: 1px solid var(--lms-border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lms-kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 0.6rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(37,99,235,0.1);
    color: var(--lms-primary);
    font-size: 1.4rem;
    flex-shrink: 0;
}

.lms-kpi-icon.success { background: rgba(16,185,129,0.1); color: var(--lms-success); }
.lms-kpi-icon.warning { background: rgba(245,158,11,0.1); color: var(--lms-warning); }
.lms-kpi-icon.danger  { background: rgba(239,68,68,0.1);  color: var(--lms-danger); }
.lms-kpi-icon.purple  { background: rgba(124,58,237,0.1); color: #7c3aed; }

.lms-kpi-value {
    font-size: 1.65rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.2rem;
}

.lms-kpi-label {
    font-size: 0.78rem;
    color: var(--lms-muted);
    text-transform: uppercase;
    letter-spacing: .3px;
}

/* ============ Cards / sections ============ */
.lms-card {
    background: var(--lms-card);
    border: 1px solid var(--lms-border);
    border-radius: 0.75rem;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.lms-card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--lms-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.lms-card-header h5 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}

.lms-card-body { padding: 1.25rem; }

/* Bootstrap overrides */
.btn-primary {
    background-color: var(--lms-primary);
    border-color: var(--lms-primary);
}
.btn-primary:hover {
    background-color: var(--lms-primary-dark);
    border-color: var(--lms-primary-dark);
}

.table { color: var(--lms-text); }

.badge.rounded-pill { font-weight: 500; }

/* AI feedback callouts */
.lms-ai-callout {
    border-left: 4px solid #7c3aed;
    background: linear-gradient(90deg, rgba(124,58,237,0.06) 0%, transparent 100%);
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.lms-ai-callout .lms-ai-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: #7c3aed;
    text-transform: uppercase;
    letter-spacing: .5px;
    margin-bottom: 0.5rem;
}

/* Login page */
.lms-login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: stretch;
    background: var(--lms-bg);
}

.lms-login-hero {
    flex: 1;
    background: linear-gradient(135deg, #1e293b 0%, #2563eb 60%, #7c3aed 100%);
    color: #fff;
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.lms-login-hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1rem;
}

.lms-login-hero p { font-size: 1.05rem; opacity: 0.9; max-width: 480px; }

.lms-login-form-wrap {
    width: 100%;
    max-width: 460px;
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.lms-login-form-wrap h2 {
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.lms-login-form-wrap .form-control {
    padding: 0.7rem 0.85rem;
    border-radius: 0.5rem;
}

@media (max-width: 900px) {
    .lms-login-hero { display: none; }
}

@media (max-width: 768px) {
    :root { --lms-rail-w: 72px; }
    .lms-content { padding: 1rem; }
    .lms-rail-link span { display: none; }
}