/* ==========================================================================
   79team AI Resource Hub - Clean Google-Inspired Design System
   ========================================================================== */

:root {
  --bg-primary: #0b0e17;
  --bg-secondary: #121624;
  --bg-card: rgba(20, 25, 41, 0.85);
  --bg-card-hover: rgba(28, 35, 58, 0.95);
  --border-card: rgba(255, 255, 255, 0.1);
  --border-card-hover: rgba(26, 115, 232, 0.5);

  --accent-primary: #1a73e8;
  --accent-secondary: #174ea6;
  --accent-gradient: #1a73e8;
  --accent-glow: rgba(26, 115, 232, 0.25);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --badge-tool: #1a73e8;
  --badge-skill: #1e8e3e;
  --badge-ext: #f2994a;
  --badge-learning: #d93025;
  --badge-captured: #64748b;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 6px 20px rgba(26, 115, 232, 0.2);

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
}

/* Light Theme Overrides (High Readability & Contrast) */
body.light-theme {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --border-card: #e2e8f0;
  --border-card-hover: #1a73e8;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 6px 20px rgba(26, 115, 232, 0.15);
}

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

.hidden {
  display: none !important;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Icon Toggle Buttons */
.icon-toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.icon-toggle-btn.lang-btn {
  min-width: 44px;
  text-align: center;
}

.icon-toggle-btn:hover {
  border-color: var(--accent-primary);
  background: rgba(26, 115, 232, 0.1);
  color: var(--accent-primary);
}

/* ==========================================================================
   Header Navigation
   ========================================================================== */

.hub-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-card);
  box-shadow: var(--shadow-sm);
}

body.light-theme .hub-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
}

.header-container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
  min-width: 180px;
  flex-shrink: 0;
}

.logo-badge {
  width: 40px;
  height: 40px;
  background: var(--accent-primary);
  color: #ffffff;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
}

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

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Search Box */
.search-box-wrapper {
  flex: 1;
  max-width: 480px;
  position: relative;
  display: flex;
  align-items: center;
}

.search-box-wrapper input {
  width: 100%;
  padding: 0.65rem 2.8rem 0.65rem 2.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  border-radius: 999px;
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

body.light-theme .search-box-wrapper input {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}

body.light-theme .search-box-wrapper input::placeholder {
  color: #64748b;
}

.search-box-wrapper input:hover,
.search-box-wrapper input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  font-size: 0.9rem;
  opacity: 0.7;
}

.search-kbd {
  position: absolute;
  right: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-card);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

body.light-theme .search-kbd {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #475569;
}

/* Buttons & Header Actions - Zero Jitter */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

#openCollectModalBtn {
  min-width: 160px;
  justify-content: center;
}

.btn-primary {
  background: var(--accent-primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  background: #1557b0;
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-card);
}

body.light-theme .btn-secondary {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.btn-github {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border-card);
  min-width: 150px;
  justify-content: center;
}

body.light-theme .btn-github {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #0f172a;
}

.btn-github:hover {
  border-color: var(--accent-primary);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hub-hero {
  padding: 3rem 1.5rem 2rem;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: rgba(26, 115, 232, 0.12);
  border: 1px solid rgba(26, 115, 232, 0.3);
  border-radius: 999px;
  color: #1a73e8;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

body.dark-theme .hero-pill {
  color: #8ab4f8;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 0.8rem;
  color: var(--text-primary);
}

body.dark-theme .hero-title {
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* Main Container */
.hub-container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  width: 100%;
  flex: 1;
}

/* Category Navigation Tabs & Readability Fixes */
.category-tabs {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
  scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

body.light-theme .tab-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #334155;
}

.tab-btn:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

/* FIX: Absolute contrast for active tabs in light & dark mode */
.tab-btn.active,
body.light-theme .tab-btn.active {
  background: var(--accent-primary) !important;
  border-color: var(--accent-primary) !important;
  color: #ffffff !important;
  box-shadow: var(--shadow-glow);
}

.tab-btn.active .tab-label,
body.light-theme .tab-btn.active .tab-label {
  color: #ffffff !important;
}

.tab-count {
  background: rgba(0, 0, 0, 0.15);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
}

body.dark-theme .tab-count {
  background: rgba(255, 255, 255, 0.15);
}

.tab-btn.active .tab-count,
body.light-theme .tab-btn.active .tab-count {
  background: rgba(255, 255, 255, 0.25) !important;
  color: #ffffff !important;
}

/* Filter Bar & Tag Chips Readability Fixes */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.sub-tags {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag-chip {
  padding: 0.35rem 0.85rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-card);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

body.light-theme .tag-chip {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #334155;
}

.tag-chip:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* FIX: Absolute contrast for active tag chips */
.tag-chip.active,
body.light-theme .tag-chip.active {
  background: var(--accent-primary) !important;
  border-color: var(--accent-primary) !important;
  color: #ffffff !important;
}

.sort-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.sort-selector select {
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  outline: none;
}

body.light-theme .sort-selector select {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}

/* Resource Cards Grid */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.resource-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.resource-card:hover {
  transform: translateY(-3px);
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  box-shadow: var(--shadow-glow);
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.card-icon-title {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex: 1;
  min-width: 0; /* Enable flex-fit & text-ellipsis */
}

.card-icon {
  font-size: 1.6rem;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: rgba(0, 0, 0, 0.05);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

body.dark-theme .card-icon {
  background: rgba(255, 255, 255, 0.05);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.category-badge {
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
  flex-shrink: 0;
}

.category-badge.tool { background: rgba(26, 115, 232, 0.12); color: #1a73e8; }
.category-badge.skill { background: rgba(30, 142, 62, 0.12); color: #1e8e3e; }
.category-badge.extension { background: rgba(242, 153, 74, 0.12); color: #d97706; }
.category-badge.learning { background: rgba(217, 48, 37, 0.12); color: #d93025; }
.category-badge.captured { background: rgba(100, 116, 139, 0.12); color: #64748b; }

.card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
}

.mini-tag {
  background: rgba(0, 0, 0, 0.05);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

body.dark-theme .mini-tag {
  background: rgba(255, 255, 255, 0.05);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-card);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.card-link {
  color: var(--accent-primary);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.card-link:hover {
  text-decoration: underline;
}

/* Modals & Toast Notification */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-overlay.hidden {
  display: none;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 100%;
  padding: 2rem;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: rgba(0, 0, 0, 0.08);
  border: none;
  color: var(--text-secondary);
  font-size: 1.25rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
}

body.dark-theme .modal-close {
  background: rgba(255, 255, 255, 0.08);
}

.modal-header {
  margin-bottom: 1.2rem;
}

.modal-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-group textarea,
.form-group select {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  color: var(--text-primary);
  font-family: inherit;
  outline: none;
}

.skill-tip-box {
  background: rgba(26, 115, 232, 0.08);
  border: 1px dashed rgba(26, 115, 232, 0.3);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  color: var(--accent-primary);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* Toast Banner */
.toast-banner {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 300;
  background: var(--accent-primary);
  color: #ffffff;
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast-banner.hidden {
  display: none;
}

@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
}

.empty-state.hidden {
  display: none;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.6;
}

/* Footer */
.hub-footer {
  border-top: 1px solid var(--border-card);
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}