/* ============================================================
   Evolve AI Institute - Multi-Course Platform
   Custom Styles (supplements Bootstrap 5.3.8)
   ============================================================ */

/* ----- CSS Variables ----- */
:root {
    --ei-navy:       #1a5276;
    --ei-navy-dark:  #0d2137;
    --ei-accent:     #e67e22;
    --ei-accent-hover:#cf6d15;
    --ei-text:       #2D2D2D;
    --ei-bg:         #F8F9FA;
    --ei-link:       #1a5276;
}

/* ----- Base ----- */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--ei-text);
    background-color: var(--ei-bg);
}

/* ----- Skip nav ----- */
.visually-hidden-focusable:focus {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    padding: 0.75rem 1.5rem;
    background: var(--ei-accent);
    color: #fff;
    font-weight: 600;
    text-decoration: none;
    outline: 3px solid #000;
}

/* ----- Navbar ----- */
.site-header .navbar {
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
}

.site-header .nav-link:hover,
.site-header .nav-link:focus {
    color: var(--ei-accent) !important;
}

/* ----- Focus indicators (WCAG AAA) ----- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--ei-accent);
    outline-offset: 2px;
}

/* ----- Links ----- */
a {
    color: var(--ei-link);
}
a:hover {
    color: var(--ei-accent-hover);
}

/* ----- Cards ----- */
.card {
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.2s ease;
}
.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

/* ----- Course cards ----- */
.course-card .badge {
    font-size: 0.7rem;
    letter-spacing: 0.03em;
}

/* ----- Buttons ----- */
.btn-accent {
    background-color: var(--ei-accent);
    border-color: var(--ei-accent);
    color: #fff;
}
.btn-accent:hover,
.btn-accent:focus {
    background-color: var(--ei-accent-hover);
    border-color: var(--ei-accent-hover);
    color: #fff;
}

.btn-navy {
    background-color: var(--ei-navy);
    border-color: var(--ei-navy);
    color: #fff;
}
.btn-navy:hover,
.btn-navy:focus {
    background-color: var(--ei-navy-dark);
    border-color: var(--ei-navy-dark);
    color: #fff;
}

/* ----- Progress bars ----- */
.progress {
    height: 0.6rem;
    border-radius: 0.3rem;
}
.progress-bar {
    background-color: var(--ei-accent);
}

/* ----- Lesson content reader ----- */
.lesson-content h1 { font-size: 1.75rem; }
.lesson-content h2 { font-size: 1.4rem; margin-top: 1.75rem; }
.lesson-content h3 { font-size: 1.15rem; margin-top: 1.25rem; }
.lesson-content p  { margin-bottom: 1rem; }
.lesson-content ul,
.lesson-content ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

/* Sidebar navigation in reader */
.reader-sidebar .nav-link {
    font-size: 0.875rem;
    padding: 0.35rem 0.75rem;
    color: var(--ei-text);
    border-radius: 0.25rem;
}
.reader-sidebar .nav-link:hover {
    background-color: #e9ecef;
}
.reader-sidebar .nav-link.active {
    background-color: var(--ei-navy);
    color: #fff;
}
.reader-sidebar .nav-link .bi-check-circle-fill {
    color: #28a745;
}

/* ----- Key takeaway boxes ----- */
.alert-info {
    border-left: 4px solid #0dcaf0;
}

/* ----- Footer ----- */
.site-footer a:hover {
    color: var(--ei-accent) !important;
    text-decoration: underline !important;
}

/* ----- Forms ----- */
.form-control:focus,
.form-select:focus {
    border-color: var(--ei-navy);
    box-shadow: 0 0 0 0.2rem rgba(26, 82, 118, 0.25);
}

/* ----- Dashboard stats ----- */
.stat-card {
    border-left: 4px solid var(--ei-accent);
}

/* ----- Print ----- */
@media print {
    .site-header,
    .site-footer,
    .reader-sidebar,
    .btn { display: none !important; }

    main { padding: 0 !important; margin: 0 !important; }

    .lesson-content { max-width: 100%; }
}

/* ----- Responsive tweaks ----- */
@media (max-width: 991.98px) {
    .reader-sidebar { display: none; }
}