/* styles.css for ExamNetwork Discussion Forum */
:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --ink: #0f172a;
  --ink-soft: #475569;
  --ink-light: #94a3b8;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --tag-bg: #f1f5f9;
  --tag-text: #334155;
  --green: #10b981;
  --green-light: #d1fae5;
  --accent-gold: #f59e0b;
  --danger: #ef4444;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

/* Header */
.forum-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.brand-wrap img {
  height: 38px;
  width: auto;
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-text span.badge {
  font-size: 0.65rem;
  background: var(--primary);
  color: #fff;
  padding: 2px 7px;
  border-radius: 99px;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.header-search {
  flex: 1;
  max-width: 500px;
  position: relative;
}

.header-search input {
  width: 100%;
  padding: 8px 14px 8px 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  background: #f1f5f9;
  outline: none;
  transition: all 0.2s;
}

.header-search input:focus {
  background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.header-search .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-light);
  font-size: 0.9rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--ink-soft);
}
.btn-outline:hover {
  background: #f1f5f9;
  color: var(--ink);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.8rem;
}

/* Layout */
.forum-container {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 240px 1fr 280px;
  gap: 24px;
}

@media (max-width: 1024px) {
  .forum-container {
    grid-template-columns: 1fr 280px;
  }
  .sidebar-nav {
    display: none;
  }
}

@media (max-width: 768px) {
  .forum-container {
    grid-template-columns: 1fr;
  }
  .sidebar-info {
    display: none;
  }
}

/* Left Nav */
.nav-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.nav-box h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--ink-light);
  letter-spacing: 0.8px;
  margin-bottom: 12px;
}

.nav-links {
  list-style: none;
}

.nav-links li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.nav-links li a:hover,
.nav-links li a.active {
  background: var(--primary-light);
  color: var(--primary);
}

/* Feed Header */
.feed-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.feed-title {
  font-size: 1.4rem;
  font-weight: 700;
}

.feed-tabs {
  display: flex;
  background: #f1f5f9;
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 2px;
}

.feed-tab {
  padding: 6px 14px;
  font-size: 0.85rem;
  border: none;
  background: transparent;
  color: var(--ink-soft);
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.feed-tab.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* Question Card */
.question-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-bottom: 14px;
  display: flex;
  gap: 18px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.question-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
}

.question-stats {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 60px;
  text-align: center;
  gap: 8px;
}

.stat-item {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.stat-item strong {
  display: block;
  font-size: 1.05rem;
  color: var(--ink);
}

.stat-item.accepted {
  border: 1px solid var(--green);
  background: var(--green-light);
  color: #065f46;
  border-radius: var(--radius-sm);
  padding: 4px 6px;
}

.stat-item.accepted strong {
  color: #065f46;
}

.question-content {
  flex: 1;
}

.question-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.question-title a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s;
}

.question-title a:hover {
  color: var(--primary);
}

.question-excerpt {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.question-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-badge {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1px solid #e2e8f0;
  transition: all 0.2s;
}

.tag-badge:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary-light);
}

.author-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--ink-light);
}

.author-chip .username {
  color: var(--ink-soft);
  font-weight: 600;
}

/* Modals */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

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

.modal-content {
  background: #ffffff;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 25px -5px rgba(0,0,0,0.2);
  padding: 28px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-header h2 {
  font-size: 1.3rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--ink-light);
}

/* Form Styles */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.editor-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  padding: 8px 12px;
}

.toolbar-btn {
  background: none;
  border: none;
  padding: 4px 8px;
  font-size: 0.85rem;
  cursor: pointer;
  border-radius: 4px;
  color: var(--ink-soft);
  font-weight: 600;
}

.toolbar-btn:hover {
  background: #e2e8f0;
  color: var(--ink);
}

.editor-area {
  border-top-left-radius: 0 !important;
  border-top-right-radius: 0 !important;
  min-height: 160px;
  resize: vertical;
}

.preview-container {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-top: 8px;
  background: #fafafa;
  min-height: 80px;
}

/* Question Detail Page */
.detail-layout {
  display: flex;
  gap: 20px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
}

.vote-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 44px;
}

.vote-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  font-size: 1rem;
  transition: all 0.2s;
}

.vote-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.vote-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.vote-score {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
}

.detail-body {
  flex: 1;
  overflow-x: auto;
}

.rendered-markdown {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #1e293b;
}

.rendered-markdown img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 12px 0;
  border: 1px solid var(--border);
}

.rendered-markdown pre {
  background: #0f172a;
  color: #f8fafc;
  padding: 14px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 12px 0;
  font-size: 0.88rem;
}

.rendered-markdown code {
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: monospace;
}

.rendered-markdown pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

/* Accepted Answer Checkmark */
.accepted-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--green);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 12px;
}

/* Modern Toast Notification */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  background: #0f172a;
  color: #ffffff;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0;
  transform: translateY(16px);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #10b981;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
}

/* Copied button highlight state */
.btn-copied {
  background-color: #d1fae5 !important;
  color: #065f46 !important;
  border-color: #34d399 !important;
}

/* Site Footer */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  margin-top: 60px;
  border-top: 1px solid #1e293b;
  font-size: 0.9rem;
}

.footer-top-strip {
  border-bottom: 1px solid #1e293b;
  padding: 16px 20px;
  background: #090e1a;
}

.footer-strip-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-quick-chips {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-chip {
  background: #1e293b;
  color: #94a3b8;
  padding: 4px 10px;
  border-radius: 99px;
  font-size: 0.78rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
}

.footer-chip:hover {
  background: var(--primary);
  color: #ffffff;
}

.footer-main-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 20px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 36px;
}

@media (max-width: 900px) {
  .footer-main-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .footer-main-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  text-decoration: none;
}

.footer-brand-desc {
  color: #94a3b8;
  font-size: 0.85rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s;
}

.footer-col ul li a:hover {
  color: #ffffff;
}

.footer-bottom-bar {
  border-top: 1px solid #1e293b;
  background: #090e1a;
  padding: 20px;
  text-align: center;
  color: #64748b;
  font-size: 0.82rem;
}

.footer-bottom-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom-links a {
  color: #94a3b8;
  text-decoration: none;
}

.footer-bottom-links a:hover {
  color: #ffffff;
}