:root {
  --bg-dark: #090d16;
  --bg-gradient: linear-gradient(135deg, #090d16 0%, #0f172a 50%, #1e1b4b 100%);
  --panel-bg: rgba(17, 24, 39, 0.85);
  --panel-border: rgba(255, 255, 255, 0.08);
  --card-bg: rgba(30, 41, 59, 0.7);
  --card-hover: rgba(30, 41, 59, 0.95);
  --card-border: rgba(255, 255, 255, 0.07);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #3b82f6 100%);
  --accent-glow: rgba(99, 102, 241, 0.35);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.25);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

/* Header & Brand Logo */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding: 18px 24px;
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  user-select: none;
}

.brand-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.2);
  transition: var(--transition);
}

.brand-logo:hover {
  transform: rotate(10deg) scale(1.05);
  box-shadow: var(--shadow-glow);
}

.logo-icon {
  width: 32px;
  height: 32px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 30%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* Session Indicator */
.session-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.session-indicator::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.session-indicator.guest {
  color: var(--warning);
  border-color: rgba(245, 158, 11, 0.4);
}

.session-indicator.guest::before {
  background: var(--warning);
  box-shadow: 0 0 8px var(--warning);
}

.session-indicator.user {
  color: var(--success);
  border-color: rgba(16, 185, 129, 0.4);
}

.session-indicator.user::before {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

/* Navigation Bar & Better Buttons */
.main-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  padding: 10px 14px;
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 16px;
  z-index: 50;
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 9px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  transform: translateY(-1px);
}

.nav-btn:active {
  transform: translateY(0);
}

.nav-btn.active {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
  border-color: rgba(255, 255, 255, 0.2);
}

.nav-btn.secondary {
  margin-left: auto;
  background: rgba(239, 68, 68, 0.12);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.nav-btn.secondary:hover {
  background: rgba(239, 68, 68, 0.22);
  color: #ffffff;
  border-color: rgba(239, 68, 68, 0.5);
  box-shadow: 0 0 14px rgba(239, 68, 68, 0.3);
}

.nav-icon {
  font-size: 1rem;
  line-height: 1;
}

/* Breadcrumb Navigation */
.breadcrumb-container {
  margin-bottom: 20px;
  padding: 10px 16px;
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.breadcrumb-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.breadcrumb-item.active {
  color: var(--text-main);
  font-weight: 600;
}

.breadcrumb-text {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.breadcrumb-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: 1px solid transparent;
  color: #a5b4fc;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  outline: none;
  font-family: inherit;
  transition: var(--transition);
}

.breadcrumb-link:hover {
  background: rgba(99, 102, 241, 0.18);
  color: #ffffff;
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-1px);
}

.breadcrumb-link:active {
  transform: translateY(0);
}

.breadcrumb-separator {
  color: var(--text-muted);
  opacity: 0.5;
  font-weight: bold;
  font-size: 0.95rem;
}

.breadcrumb-icon {
  font-size: 0.95rem;
  line-height: 1;
}

.drilldown-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(245, 158, 11, 0.16);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.2);
}

/* Action Buttons */
.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary-gradient);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  padding: 12px 22px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.action-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow), 0 6px 20px rgba(99, 102, 241, 0.45);
}

.action-btn:active {
  transform: translateY(0);
}

/* Panels */
.panel {
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.panel h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel h2::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.15), transparent);
}

/* Forms and Inputs */
form {
  display: grid;
  gap: 16px;
}

form > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

form label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(15, 23, 42, 0.7);
  color: var(--text-main);
  padding: 12px 16px;
  font-size: 0.95rem;
  transition: var(--transition);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(15, 23, 42, 0.95);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="file"] {
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(255, 255, 255, 0.2);
  background: rgba(15, 23, 42, 0.4);
  color: var(--text-muted);
  padding: 12px;
  font-size: 0.88rem;
  cursor: pointer;
  transition: var(--transition);
}

input[type="file"]:hover {
  border-color: var(--primary);
  background: rgba(15, 23, 42, 0.7);
}

textarea {
  min-height: 130px;
  resize: vertical;
}

/* Replying Target Preview in Post Form */
.reply-target-preview {
  background: rgba(30, 41, 59, 0.85);
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  animation: fadeIn 0.2s ease-out;
}

.reply-target-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.reply-target-info {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.85rem;
}

.reply-target-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(99, 102, 241, 0.25);
  color: #c7d2fe;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.01em;
}

.reply-target-author {
  color: #38bdf8;
  font-weight: 700;
}

.reply-target-id {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.82rem;
}

.reply-target-time {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.cancel-reply-btn {
  background: rgba(239, 68, 68, 0.14);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.cancel-reply-btn:hover {
  background: rgba(239, 68, 68, 0.28);
  color: #ffffff;
  border-color: rgba(239, 68, 68, 0.6);
  transform: translateY(-1px);
}

.cancel-reply-btn:active {
  transform: translateY(0);
}

.reply-target-content {
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.5;
  max-height: 120px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
  padding-left: 2px;
}

.reply-target-media {
  margin-top: 10px;
}

.reply-target-media img {
  max-height: 90px;
  max-width: 160px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* In-Reply-To Indicator on Message Cards */
.in-reply-to-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(99, 102, 241, 0.12);
  color: #c7d2fe;
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-pill);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 2px 9px;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  outline: none;
}

.in-reply-to-pill:hover {
  background: rgba(99, 102, 241, 0.25);
  color: #ffffff;
  border-color: rgba(99, 102, 241, 0.55);
  transform: translateY(-1px);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.3);
}

.in-reply-to-pill:active {
  transform: translateY(0);
}

.in-reply-icon {
  color: #818cf8;
  font-weight: bold;
}

/* Status & Errors */
.hidden {
  display: none !important;
}

.status {
  margin-top: 14px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  min-height: 20px;
}

.status:empty {
  display: none;
}

.status.success {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status.error {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.field-error {
  min-height: 18px;
  color: #f87171;
  font-size: 0.82rem;
  font-weight: 500;
}

.field-error:empty {
  display: none;
}

/* Messages List */
.message-list {
  display: grid;
  gap: 16px;
}

.message-feed-items {
  display: grid;
  gap: 16px;
}

.message-card {
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.message-card:hover {
  background: var(--card-hover);
  border-color: rgba(255, 255, 255, 0.14);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.message-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 10px;
  font-weight: 600;
}

.message-author-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.message-author-tag span:first-child {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #a5b4fc;
  background: rgba(99, 102, 241, 0.12);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.message-timestamp {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.message-card img {
  display: block;
  max-width: 100%;
  max-height: 400px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  margin-top: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.3);
}

.message-card img.broken-image {
  display: none;
}

.search-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}

.search-query-badge {
  display: inline-flex;
  align-items: center;
  background: rgba(99, 102, 241, 0.2);
  color: #c7d2fe;
  border: 1px solid rgba(99, 102, 241, 0.4);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: var(--shadow-glow);
}

.empty-state {
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 16px 0;
  text-align: center;
}

/* Infinite Scroll Indicators & Elements */
.infinite-scroll-status {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 18px 0 10px;
  width: 100%;
  min-height: 24px;
}

.infinite-scroll-status:empty {
  display: none;
}

.infinite-scroll-loading {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 8px 16px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  animation: fadeIn 0.2s ease-out;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(99, 102, 241, 0.25);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.infinite-scroll-end {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 16px 0 8px;
  width: 100%;
  opacity: 0.8;
  letter-spacing: 0.02em;
}

.infinite-scroll-end::before,
.infinite-scroll-end::after {
  content: '';
  flex: 1;
  max-width: 100px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15));
}

.infinite-scroll-end::after {
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.15), transparent);
}

.infinite-scroll-error {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fca5a5;
  font-size: 0.85rem;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
}

.retry-btn {
  background: rgba(99, 102, 241, 0.25);
  color: #c7d2fe;
  border: 1px solid rgba(99, 102, 241, 0.45);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 12px;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.retry-btn:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.infinite-scroll-sentinel {
  height: 1px;
  width: 100%;
  pointer-events: none;
  opacity: 0;
  margin-top: 4px;
}

.message-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

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

.message-stats-actions {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.message-stats {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.message-stat {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  letter-spacing: 0.01em;
}

.message-stat .stat-icon {
  font-size: 0.82rem;
}

.message-stat .stat-label {
  color: var(--text-muted);
}

.reply-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(99, 102, 241, 0.12);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 12px;
  cursor: pointer;
  outline: none;
  font-family: inherit;
  transition: var(--transition);
}

.reply-btn:hover {
  background: rgba(99, 102, 241, 0.28);
  color: #ffffff;
  border-color: rgba(99, 102, 241, 0.6);
  transform: translateY(-1px);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.3);
}

.reply-btn:active {
  transform: translateY(0);
}

.tag {
  display: inline-flex;
  align-items: center;
  background: rgba(59, 130, 246, 0.15);
  color: #93c5fd;
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 12px;
  cursor: pointer;
  outline: none;
  font-family: inherit;
  transition: var(--transition);
  text-decoration: none;
}

.tag:hover {
  background: rgba(99, 102, 241, 0.3);
  color: #ffffff;
  border-color: rgba(99, 102, 241, 0.6);
  transform: translateY(-1px);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.35);
}

.tag:active {
  transform: translateY(0);
}

/* Thread Drilldown & Timeline */
.thread-drilldown-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.thread-root-card {
  border-color: rgba(99, 102, 241, 0.45);
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.9) 0%, rgba(49, 46, 129, 0.3) 100%);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.2);
}

.thread-starter-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(168, 85, 247, 0.25) 100%);
  border: 1px solid rgba(168, 85, 247, 0.4);
  color: #e0e7ff;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 12px;
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.2);
}

.thread-id-pill {
  background: rgba(0, 0, 0, 0.3);
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  color: #a5b4fc;
}

.thread-replies-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.thread-replies-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #f1f5f9;
  display: flex;
  align-items: center;
  gap: 8px;
}

.thread-replies-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.thread-empty-replies {
  text-align: center;
  padding: 30px 16px;
  background: rgba(30, 41, 59, 0.4);
  border: 1px dashed rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.action-btn-sm {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-gradient);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.action-btn-sm:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.thread-timeline {
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  padding-left: 20px;
  border-left: 2px solid rgba(99, 102, 241, 0.35);
  margin-left: 12px;
  margin-top: 4px;
}

.thread-reply-card {
  position: relative;
  background: rgba(30, 41, 59, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.thread-reply-card::before {
  content: '';
  position: absolute;
  left: -22px;
  top: 22px;
  width: 14px;
  height: 2px;
  background: rgba(99, 102, 241, 0.45);
}

.reply-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
}

/* Info & About Section */
.info-hero {
  text-align: center;
  padding: 24px 16px 28px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(168, 85, 247, 0.08) 100%);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

.info-badge {
  display: inline-block;
  background: rgba(99, 102, 241, 0.2);
  color: #c7d2fe;
  border: 1px solid rgba(99, 102, 241, 0.4);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.info-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #ffffff 40%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.info-lead {
  font-size: 1.05rem;
  color: #cbd5e1;
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.6;
}

.info-lead strong {
  color: #38bdf8;
}

.info-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}

.info-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
}

.info-card:hover {
  background: var(--card-hover);
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.info-card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.info-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 8px;
}

.info-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.info-card code {
  background: rgba(0, 0, 0, 0.3);
  padding: 2px 6px;
  border-radius: 4px;
  color: #38bdf8;
  font-size: 0.84rem;
}

/* GitHub Promo Box */
.github-promo-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(30, 41, 59, 0.9) 100%);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.github-promo-content {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  min-width: 260px;
}

.github-icon-wrapper {
  color: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  padding: 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.github-promo-text h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.github-promo-text p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.github-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  color: #0f172a;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 2px 10px rgba(255, 255, 255, 0.2);
}

.github-action-btn:hover {
  background: #f1f5f9;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(255, 255, 255, 0.3);
}

.external-icon {
  font-size: 1rem;
  font-weight: bold;
}

/* Quicklinks Grid */
.info-quicklinks {
  margin-top: 10px;
}

.info-quicklinks h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 14px;
}

.quicklinks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.quicklink-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  text-decoration: none;
  transition: var(--transition);
}

.quicklink-card:hover {
  background: var(--card-hover);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.quicklink-icon {
  font-size: 1.5rem;
}

.quicklink-info {
  display: flex;
  flex-direction: column;
}

.quicklink-info strong {
  color: #f1f5f9;
  font-size: 0.88rem;
}

.quicklink-info span {
  color: var(--text-muted);
  font-size: 0.78rem;
}


.message-replies-btn {
  cursor: pointer;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.message-replies-btn:hover {
  background: rgba(99, 102, 241, 0.2);
  color: #ffffff;
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

/* ==========================================================================
   DEDICATED MOBILE DESIGN (Activated on screens <= 768px)
   ========================================================================== */
@media (max-width: 768px) {
  body {
    padding-bottom: 30px;
  }

  .container {
    padding: 12px 10px 40px;
  }

  /* Compact Mobile Header */
  .app-header {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    padding: 14px 16px;
    margin-bottom: 16px;
    border-radius: var(--radius-md);
  }

  .brand {
    justify-content: flex-start;
  }

  .brand-logo {
    width: 38px;
    height: 38px;
  }

  .logo-icon {
    width: 26px;
    height: 26px;
  }

  .brand-title {
    font-size: 1.25rem;
  }

  .brand-subtitle {
    font-size: 0.72rem;
  }

  .session-indicator {
    align-self: flex-start;
    font-size: 0.78rem;
    padding: 5px 12px;
  }

  /* Dedicated Mobile Navigation */
  .main-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 8px;
    padding: 8px;
    margin-bottom: 14px;
    border-radius: var(--radius-md);
    position: static;
  }

  .nav-btn {
    justify-content: center;
    padding: 10px 8px;
    font-size: 0.82rem;
    min-height: 44px;
    border-radius: var(--radius-sm);
  }

  .nav-btn.secondary {
    margin-left: 0;
    grid-column: 1 / -1;
  }

  .nav-icon {
    font-size: 1.1rem;
  }

  /* Mobile Breadcrumb */
  .breadcrumb-container {
    padding: 8px 12px;
    margin-bottom: 14px;
  }

  .breadcrumb-item {
    font-size: 0.82rem;
  }

  .breadcrumb-link {
    font-size: 0.82rem;
    padding: 2px 6px;
  }

  .drilldown-badge {
    font-size: 0.7rem;
    padding: 2px 8px;
  }

  /* Full-width Mobile Panels */
  .panel {
    padding: 18px 14px;
    border-radius: var(--radius-md);
  }

  .panel h2 {
    font-size: 1.2rem;
    margin-bottom: 16px;
  }

  /* Mobile-friendly Form & Touch Targets */
  input[type="text"],
  input[type="email"],
  input[type="password"],
  textarea {
    font-size: 16px; /* Prevents auto-zoom on iOS */
    padding: 12px 14px;
    min-height: 44px;
  }

  textarea {
    min-height: 110px;
  }

  .action-btn {
    width: 100%;
    min-height: 46px;
    font-size: 1rem;
    padding: 12px;
  }

  /* Mobile Message Cards */
  .message-card {
    padding: 14px 14px;
  }

  .message-meta {
    font-size: 0.8rem;
  }

  .message-card img {
    max-height: 280px;
  }

  .message-footer {
    gap: 8px;
  }

  .message-stats-actions {
    width: 100%;
    justify-content: space-between;
  }

  /* Mobile Thread Timeline */
  .thread-timeline {
    padding-left: 12px;
    margin-left: 4px;
  }

  .thread-reply-card::before {
    left: -14px;
    width: 8px;
  }
}