/* ============================================================
   EDU Smart Next Program - Online Manual Stylesheet (manual.css)
   ============================================================ */

:root {
    --primary: #4F46E5;
    --primary-light: #EEF2FF;
    --primary-dark: #3730A3;
    
    --role-learner: #D97706;
    --role-learner-light: #FFFBEB;
    --role-learner-border: #FCD34D;
    
    --role-instructor: #059669;
    --role-instructor-light: #ECFDF5;
    --role-instructor-border: #6EE7B7;
    
    --role-admin: #4F46E5;
    --role-admin-light: #EEF2FF;
    --role-admin-border: #A5B4FC;
    
    --text-main: #1E293B;
    --text-muted: #64748B;
    --bg-page: #F8FAFC;
    --bg-card: #FFFFFF;
    --border-color: #E2E8F0;
    --sidebar-width: 300px;
}

body {
    font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-page);
    line-height: 1.65;
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

/* --- Top Navigation Header --- */
.manual-topbar {
    position: sticky;
    top: 0;
    z-index: 1040;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
}

.brand-info {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: inherit;
}

.brand-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.brand-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #0F172A;
    line-height: 1.2;
}

.brand-subtitle {
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* Action buttons in Topbar */
.manual-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Dropdown PDF Export Button */
.btn-pdf-export {
    background: linear-gradient(135deg, #DC2626 0%, #B91C1C 100%);
    color: #fff;
    border: none;
    padding: 8px 18px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 10px rgba(220, 38, 38, 0.25);
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-pdf-export:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(220, 38, 38, 0.35);
    color: #fff;
}

/* --- Layout Container --- */
.manual-container {
    display: flex;
    max-width: 1540px;
    margin: 0 auto;
    min-height: calc(100vh - 64px);
}

/* --- Sticky Sidebar Navigation --- */
.manual-sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: #FFFFFF;
    border-right: 1px solid var(--border-color);
    position: sticky;
    top: 64px;
    height: calc(100vh - 64px);
    overflow-y: auto;
    padding: 20px 16px;
}

.search-box {
    position: relative;
    margin-bottom: 20px;
}

.search-box input {
    width: 100%;
    padding: 9px 12px 9px 36px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: #F1F5F9;
    font-size: 0.88rem;
    outline: none;
    transition: border-color 0.15s, background 0.15s;
}

.search-box input:focus {
    border-color: var(--primary);
    background: #FFFFFF;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Role Filter Pills */
.role-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.role-tab-btn {
    flex: 1 1 calc(50% - 4px);
    text-align: center;
    padding: 6px 8px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: #FFF;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.role-tab-btn:hover {
    background: #F8FAFC;
    color: var(--text-main);
}

.role-tab-btn.active[data-role="all"] {
    background: var(--primary);
    color: #FFF;
    border-color: var(--primary);
}

.role-tab-btn.active[data-role="learner"] {
    background: var(--role-learner);
    color: #FFF;
    border-color: var(--role-learner);
}

.role-tab-btn.active[data-role="instructor"] {
    background: var(--role-instructor);
    color: #FFF;
    border-color: var(--role-instructor);
}

.role-tab-btn.active[data-role="admin"] {
    background: var(--role-admin);
    color: #FFF;
    border-color: var(--role-admin);
}

/* Navigation Menu Tree */
.nav-group-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin: 16px 0 8px 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link-item {
    display: block;
    padding: 7px 12px;
    font-size: 0.87rem;
    color: #334155;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.15s ease;
    margin-bottom: 2px;
    border-left: 3px solid transparent;
}

.nav-link-item:hover {
    background: #F1F5F9;
    color: var(--primary);
}

.nav-link-item.active {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
    border-left-color: var(--primary);
}

/* --- Content Main Area --- */
.manual-content {
    flex: 1;
    padding: 36px 48px;
    max-width: 1200px;
}

/* Role Hero Banner in Content */
.role-hero {
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 40px;
    color: #FFFFFF;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.hero-learner {
    background: linear-gradient(135deg, #D97706 0%, #B45309 100%);
}

.hero-instructor {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
}

.hero-admin {
    background: linear-gradient(135deg, #4F46E5 0%, #3730A3 100%);
}

.role-hero h2 {
    font-size: 1.85rem;
    font-weight: 800;
    margin: 0 0 8px 0;
}

.role-hero p {
    font-size: 1rem;
    opacity: 0.95;
    margin-bottom: 16px;
}

.role-hero .hero-badges {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.role-hero .badge-pill {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(4px);
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Topic Section Cards */
.topic-card {
    background: #FFFFFF;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    padding: 30px;
    margin-bottom: 36px;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.03);
    scroll-margin-top: 80px;
    transition: box-shadow 0.2s;
}

.topic-card:hover {
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.topic-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #F1F5F9;
    padding-bottom: 16px;
    margin-bottom: 24px;
}

.topic-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    font-size: 1.35rem;
    font-weight: 700;
    color: #0F172A;
}

.topic-number {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 800;
    color: #FFF;
}

.num-learner { background: var(--role-learner); }
.num-instructor { background: var(--role-instructor); }
.num-admin { background: var(--role-admin); }

/* Steps List styling */
.step-timeline {
    position: relative;
    padding-left: 28px;
    margin: 20px 0;
}

.step-timeline::before {
    content: '';
    position: absolute;
    left: 11px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: #E2E8F0;
}

.step-item {
    position: relative;
    margin-bottom: 24px;
}

.step-marker {
    position: absolute;
    left: -28px;
    top: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary);
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    box-shadow: 0 0 0 3px #FFF;
}

.step-item h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0 0 6px 0;
    color: #1E293B;
}

.step-item p {
    margin: 0 0 10px 0;
    color: #475569;
    font-size: 0.95rem;
}

/* Callout Points (① ② ③) */
.callout-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #DC2626;
    color: #FFF;
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: 4px;
    vertical-align: middle;
}

/* Interactive UI Mockup Box with Annotation Badges */
.mockup-frame {
    background: #FFFFFF;
    border: 1px solid #CBD5E1;
    border-radius: 12px;
    overflow: hidden;
    margin: 20px 0;
    box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
}

.mockup-header {
    background: #F1F5F9;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid #E2E8F0;
}

.mockup-dots {
    display: flex;
    gap: 5px;
}

.mockup-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.dot-red { background: #EF4444; }
.dot-yellow { background: #F59E0B; }
.dot-green { background: #10B981; }

.mockup-url {
    background: #FFFFFF;
    padding: 3px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    color: #64748B;
    border: 1px solid #E2E8F0;
    flex: 1;
    max-width: 450px;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

.mockup-body {
    padding: 16px;
    background: #FAF5FF;
    position: relative;
}

.mockup-svg-wrap {
    width: 100%;
    display: flex;
    justify-content: center;
    cursor: zoom-in;
}

.mockup-svg-wrap svg {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Callout Guide Legend */
.callout-legend {
    background: #F8FAFC;
    border-top: 1px solid #E2E8F0;
    padding: 14px 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 12px;
    font-size: 0.88rem;
}

.legend-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    color: #334155;
}

/* Info Box / Alerts */
.info-box {
    border-radius: 10px;
    padding: 16px 20px;
    margin: 16px 0;
    display: flex;
    gap: 12px;
    align-items: flex-start;
    font-size: 0.92rem;
}

.info-tip {
    background: #EFF6FF;
    border-left: 4px solid #3B82F6;
    color: #1E40AF;
}

.info-warning {
    background: #FFFBEB;
    border-left: 4px solid #F59E0B;
    color: #92400E;
}

.info-success {
    background: #ECFDF5;
    border-left: 4px solid #10B981;
    color: #065F46;
}

.info-box i {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Quick Navigation Links */
.jump-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin: 20px 0 36px 0;
}

.jump-card {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 18px;
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.jump-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.06);
    border-color: var(--primary);
}

.jump-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.jump-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: #0F172A;
    margin-bottom: 2px;
}

.jump-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Lightbox Modal */
.image-modal {
    display: none;
    position: fixed;
    z-index: 2000;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.image-modal.active {
    display: flex;
}

.image-modal-content {
    max-width: 90%;
    max-height: 90vh;
    background: #FFF;
    border-radius: 12px;
    padding: 12px;
    position: relative;
}

.image-modal-close {
    position: absolute;
    top: -16px;
    right: -16px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #EF4444;
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    border: 2px solid #FFF;
}

/* Responsive Rules */
@media (max-width: 992px) {
    .manual-sidebar {
        display: none;
    }
    .manual-content {
        padding: 24px 16px;
    }
}