/**
 * course/style.css
 * Course Management - AISI Glassmorphism Style
 * Brand Color: #5f849b
 */

/* ============================================
   Base Styles
   Note: CSS variables are defined in aisi-bootstrap-custom.css
   (including dark theme overrides). Do NOT redeclare :root here
   or it will override [data-theme="dark"] due to cascade order.
============================================ */
body {
  background-color: var(--aisi-bg);
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(95, 132, 155, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(122, 157, 179, 0.05) 0%, transparent 50%);
  font-family: "Noto Sans TC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* ============================================
   Navbar
============================================ */
.aisi-accent-background {
  background: linear-gradient(135deg, var(--aisi-primary-dark) 0%, var(--aisi-primary) 50%, var(--aisi-primary-light) 100%) !important;
  backdrop-filter: blur(var(--aisi-blur-md));
  box-shadow: var(--aisi-shadow-md);
  position: relative;
  z-index: 1030;
}

/* ============================================
   Join Course Button
============================================ */
#join-course-btn {
  border-width: 2px;
  border-radius: 8px;
  transition: all var(--aisi-transition);
}

#join-course-btn:hover {
  background: var(--aisi-primary);
  border-color: var(--aisi-primary);
  color: white;
  transform: translateY(-1px);
}

#join-course-btn i {
  vertical-align: middle;
}

.btn-group #join-course-btn {
  margin-right: 0.5rem;
}

/* ============================================
   Course Banner - Glassmorphism
============================================ */
.course-banner {
  padding: 4rem 2rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--aisi-primary-dark) 0%, var(--aisi-primary) 50%, var(--aisi-primary-light) 100%);
  background-size: cover;
  background-position: center;
  border-radius: 0;
  position: relative;
  overflow: hidden;
}

.course-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(0, 0, 0, 0.1) 0%, transparent 50%);
  z-index: 1;
}

.course-banner::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.25);
  z-index: 1;
}

.course-banner .container {
  position: relative;
  z-index: 2;
}

/* ============================================
   Course Cards - Glassmorphism
============================================ */
.course-card {
  background: var(--aisi-bg-glass);
  backdrop-filter: blur(var(--aisi-blur-sm));
  -webkit-backdrop-filter: blur(var(--aisi-blur-sm));
  border: 1px solid rgba(95, 132, 155, 0.1);
  border-left: 4px solid var(--aisi-primary);
  border-radius: 16px;
  box-shadow: var(--aisi-shadow-sm);
  transition: all var(--aisi-transition);
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--aisi-shadow-lg);
  border-color: rgba(95, 132, 155, 0.2);
}

.course-card .card-body {
  padding: 1.5rem;
}

.course-card .card-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #1a2e3b;
}

.course-card .card-title a {
  text-decoration: none;
  color: inherit;
  transition: color var(--aisi-transition);
}

.course-card .card-title a:hover {
  color: var(--aisi-primary);
}

/* ============================================
   Announcement Cards - Glassmorphism
============================================ */
.announcement-card {
  background: var(--aisi-bg-glass);
  backdrop-filter: blur(var(--aisi-blur-sm));
  -webkit-backdrop-filter: blur(var(--aisi-blur-sm));
  border: 1px solid rgba(95, 132, 155, 0.1);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--aisi-shadow-sm);
  transition: all var(--aisi-transition);
}

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

.announcement-card .card-body {
  padding: 0;
}

.announcement-card .comment-section {
  border-top: 1px solid rgba(95, 132, 155, 0.1);
  margin-top: 1rem;
  padding-top: 1rem;
}

.announcement-card h6 {
  font-size: 1.35rem;
  font-weight: 600;
  color: #1a2e3b;
  margin-bottom: 0.75rem;
}

.announcement-card .announcement-author {
  font-size: 1rem;
  font-weight: 500;
  color: var(--aisi-primary-dark);
  display: block;
  margin-bottom: 0.25rem;
}

.announcement-card .announcement-time {
  font-size: 0.875rem;
  color: #8fa3b1;
  margin-bottom: 1rem;
}

.announcement-card .announcement-body {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(95, 132, 155, 0.08);
  color: #333;
}

/* ============================================
   Member Avatar
============================================ */
.member-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--aisi-shadow-sm);
  border: 2px solid rgba(95, 132, 155, 0.1);
}

/* ============================================
   Status Badge
============================================ */
.status-badge {
  font-size: 0.8em;
  padding: 0.4em 0.7em;
  border-radius: 6px;
}

/* ============================================
   Announcement Body Content
============================================ */
.announcement-body {
  font-size: 1rem;
  line-height: 1.6;
}

.announcement-body h1, .announcement-body h2, .announcement-body h3,
.announcement-body h4, .announcement-body h5, .announcement-body h6 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #1a2e3b;
}

.announcement-body p {
  margin-bottom: 0.75rem;
}

.announcement-body ul, .announcement-body ol {
  margin-bottom: 0.75rem;
  padding-left: 1.25rem;
}

.announcement-body blockquote {
  border-left: 4px solid var(--aisi-primary-pale);
  padding-left: 1rem;
  margin: 1rem 0;
  color: #6c757d;
  font-style: italic;
  background: rgba(95, 132, 155, 0.03);
  padding: 1rem;
  border-radius: 0 8px 8px 0;
}

.announcement-body code {
  background: rgba(95, 132, 155, 0.08);
  border: 1px solid rgba(95, 132, 155, 0.15);
  border-radius: 4px;
  padding: 0.125rem 0.375rem;
  font-size: 0.875em;
  color: var(--aisi-primary-dark);
}

.announcement-body pre {
  background: rgba(95, 132, 155, 0.05);
  border: 1px solid rgba(95, 132, 155, 0.1);
  border-radius: 12px;
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 0.75rem;
}

.announcement-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

.announcement-body a {
  color: var(--aisi-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all var(--aisi-transition);
}

.announcement-body a:hover {
  color: var(--aisi-primary-dark);
  border-bottom-color: var(--aisi-primary);
}

.announcement-body table {
  width: 100%;
  margin-bottom: 1rem;
  border-collapse: collapse;
  border-radius: 8px;
  overflow: hidden;
}

.announcement-body table th,
.announcement-body table td {
  padding: 0.75rem;
  border: 1px solid var(--aisi-border);
  text-align: left;
}

.announcement-body table th {
  background: linear-gradient(135deg, var(--aisi-primary-dark) 0%, var(--aisi-primary) 100%);
  color: #fff;
  font-weight: 600;
}

.announcement-body table tr:nth-child(even) {
  background: rgba(95, 132, 155, 0.03);
}

/* ============================================
   Image Toggle Container
============================================ */
.image-toggle-container {
  background: rgba(95, 132, 155, 0.05);
  border: 1px solid rgba(95, 132, 155, 0.1);
  border-radius: 12px;
  padding: 0.75rem;
  margin: 0.5rem 0;
}

.image-preview {
  text-align: center;
  background: white;
  border-radius: 8px;
  padding: 0.5rem;
  border: 1px solid rgba(95, 132, 155, 0.1);
}

.image-preview img {
  transition: transform var(--aisi-transition);
  cursor: pointer;
  border-radius: 8px;
}

.image-preview img:hover {
  transform: scale(1.02);
}

/* ============================================
   Navigation Tabs - Glassmorphism
============================================ */
.nav-tabs {
  border-bottom: 2px solid rgba(95, 132, 155, 0.1);
}

.nav-tabs .nav-link {
  color: #6c757d;
  background-color: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 0.75rem 1.25rem;
  font-weight: 500;
  transition: all var(--aisi-transition);
  margin-bottom: -2px;
  border-radius: 8px 8px 0 0;
}

.nav-tabs .nav-link:hover {
  color: var(--aisi-primary);
  background-color: rgba(95, 132, 155, 0.05);
  border-bottom-color: rgba(95, 132, 155, 0.3);
}

.nav-tabs .nav-link.active {
  color: var(--aisi-primary);
  background-color: rgba(95, 132, 155, 0.08);
  border-bottom-color: var(--aisi-primary);
  font-weight: 600;
}

.nav-tabs .nav-link:focus {
  box-shadow: none;
  outline: none;
}

/* Tab Content */
.tab-content {
  background: var(--aisi-bg-glass);
  backdrop-filter: blur(var(--aisi-blur-sm));
  border: 1px solid rgba(95, 132, 155, 0.1);
  border-top: none;
  border-radius: 0 0 16px 16px;
  box-shadow: var(--aisi-shadow-sm);
}

.tab-pane {
  padding: 2rem;
}

/* ============================================
   Filter Segmented Control
============================================ */
.filter-segmented-control {
  border-radius: 10px;
  box-shadow: var(--aisi-shadow-sm);
  overflow: hidden;
}

.filter-segmented-control .btn {
  border-radius: 0;
  transition: all var(--aisi-transition);
  border: 1px solid var(--aisi-border);
}

.filter-segmented-control .btn:first-child {
  border-top-left-radius: 10px;
  border-bottom-left-radius: 10px;
}

.filter-segmented-control .btn:last-child {
  border-top-right-radius: 10px;
  border-bottom-right-radius: 10px;
}

.filter-segmented-control .btn.active,
.filter-segmented-control .btn:hover {
  background: linear-gradient(135deg, var(--aisi-primary-dark) 0%, var(--aisi-primary) 100%);
  border-color: var(--aisi-primary);
  color: white;
}

/* ============================================
   Batch Selection
============================================ */
.announcement-selected {
  background: linear-gradient(135deg, rgba(33, 150, 243, 0.1) 0%, rgba(33, 150, 243, 0.05) 100%) !important;
  border-color: #2196f3 !important;
}

.announcement-card .form-check-input {
  cursor: pointer;
  width: 1.25rem;
  height: 1.25rem;
}

.announcement-card .form-check-input:checked {
  background-color: var(--aisi-primary);
  border-color: var(--aisi-primary);
}

/* ============================================
   Deleted Items
============================================ */
.announcement-deleted,
.assignment-deleted {
  opacity: 0.6;
  background: rgba(108, 117, 125, 0.05) !important;
  border-left: 4px solid #6c757d !important;
}

.announcement-deleted .announcement-body,
.assignment-deleted .card-text {
  color: #6c757d;
}

/* ============================================
   Batch Mode Button
============================================ */
.btn-outline-secondary:hover {
  background: linear-gradient(135deg, var(--aisi-primary-dark) 0%, var(--aisi-primary) 100%);
  border-color: var(--aisi-primary);
  color: white;
}

/* ============================================
   Assignment Accordion - Glassmorphism
============================================ */
.assignment-accordion {
  margin: 0;
  border: 1px solid rgba(95, 132, 155, 0.1);
  border-radius: 12px;
  overflow: hidden;
}

.assignment-accordion .accordion-item {
  background: rgba(95, 132, 155, 0.03);
  border: none;
}

.assignment-accordion .accordion-button {
  padding: 0.75rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--aisi-primary);
  background: rgba(95, 132, 155, 0.03);
  border: none;
  transition: all var(--aisi-transition);
}

.assignment-accordion .accordion-button:not(.collapsed) {
  background: rgba(95, 132, 155, 0.08);
  color: var(--aisi-primary-dark);
  box-shadow: none;
}

.assignment-accordion .accordion-button:hover {
  background: rgba(95, 132, 155, 0.1);
}

.assignment-accordion .accordion-button::after {
  transform: rotate(0deg);
  transition: transform 0.3s ease;
}

.assignment-accordion .accordion-button:not(.collapsed)::after {
  transform: rotate(180deg);
}

.assignment-accordion .accordion-button:focus {
  box-shadow: none;
  border-color: transparent;
}

.assignment-accordion .accordion-collapse {
  transition: all 0.3s ease;
}

.assignment-description-body {
  padding: 1rem 1.25rem;
  background: var(--aisi-card);
  line-height: 1.6;
  color: #333;
}

.assignment-description-body p {
  margin-bottom: 0.5rem;
}

.assignment-description-body p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Submissions Table
============================================ */
.submission-not-submitted {
  opacity: 0.55;
}

[data-theme="dark"] .submission-not-submitted {
  opacity: 0.45;
}

/* ============================================
   Dark Theme Overrides
============================================ */
[data-theme="dark"] .course-banner {
  background: linear-gradient(135deg, #1a2e3b 0%, #2a4458 50%, #3a5568 100%);
}

[data-theme="dark"] .course-banner::after {
  background-color: rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .course-card .card-title {
  color: var(--aisi-text, #e0e8f0);
}

[data-theme="dark"] .announcement-card h6 {
  color: var(--aisi-text, #e0e8f0);
}

[data-theme="dark"] .announcement-card .announcement-time {
  color: var(--aisi-text-muted, #6a8090);
}

[data-theme="dark"] .announcement-card .announcement-body {
  color: var(--aisi-text-secondary, #a0b4c4);
}

[data-theme="dark"] .announcement-body h1,
[data-theme="dark"] .announcement-body h2,
[data-theme="dark"] .announcement-body h3,
[data-theme="dark"] .announcement-body h4,
[data-theme="dark"] .announcement-body h5,
[data-theme="dark"] .announcement-body h6 {
  color: var(--aisi-text, #e0e8f0);
}

[data-theme="dark"] .announcement-body blockquote {
  color: var(--aisi-text-muted, #6a8090);
  background: rgba(95, 132, 155, 0.06);
}

[data-theme="dark"] .announcement-body code {
  background: rgba(95, 132, 155, 0.12);
  color: var(--aisi-primary-light, #7a9db3);
}

[data-theme="dark"] .announcement-body pre {
  background: rgba(95, 132, 155, 0.08);
}

[data-theme="dark"] .assignment-description-body {
  background: var(--aisi-card, #1a2332);
  color: var(--aisi-text-secondary, #a0b4c4);
}

[data-theme="dark"] .nav-tabs .nav-link {
  color: var(--aisi-text-muted, #6a8090);
}

[data-theme="dark"] .nav-tabs .nav-link:hover {
  color: var(--aisi-primary-light, #7a9db3);
}

[data-theme="dark"] .nav-tabs .nav-link.active {
  color: var(--aisi-primary-light, #7a9db3);
  background-color: rgba(95, 132, 155, 0.12);
}

[data-theme="dark"] .image-preview {
  background: var(--aisi-card, #172030);
}

[data-theme="dark"] .announcement-body table tr:nth-child(even) {
  background: rgba(95, 132, 155, 0.06);
}