/* =========================
   LEADERBOARD STYLES
   Modern, Responsive, Accessible
   Created: May 10, 2026
   ========================= */

:root {
  --leaderboard-primary: #667eea;
  --leaderboard-secondary: #764ba2;
  --leaderboard-accent: #f5576c;
  --leaderboard-gold: #ffd700;
  --leaderboard-silver: #c0c0c0;
  --leaderboard-bronze: #cd7f32;
  --leaderboard-card-bg: #ffffff;
  --leaderboard-card-shadow: rgba(0, 0, 0, 0.1);
  --leaderboard-text: #333;
  --leaderboard-text-muted: #666;
  --leaderboard-border: #e0e0e0;
  --leaderboard-hover: #f8f9fa;
  --leaderboard-gradient-start: #ff8a00;
  --leaderboard-gradient-end: #e52e71;
}

.dark-mode {
  --leaderboard-card-bg: #2d3748;
  --leaderboard-card-shadow: rgba(0, 0, 0, 0.3);
  --leaderboard-text: #e2e8f0;
  --leaderboard-text-muted: #cbd5e0;
  --leaderboard-border: #4a5568;
  --leaderboard-hover: #3a4556;
}

/* =========================
   LEADERBOARD CONTAINER
   ========================= */

.leaderboard-container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.leaderboard-header {
  text-align: center;
  margin-bottom: 2rem;
}

.leaderboard-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--leaderboard-gradient-start), var(--leaderboard-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: rgb(0, 0, 0);
  background-clip: text;
  margin: 0 0 1rem 0;
  animation: titlePulse 3s ease-in-out infinite;
}

@keyframes titlePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

/* =========================
   LEADERBOARD TYPE SELECTOR
   ========================= */

.leaderboard-type-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2rem;
  padding: 1rem;
  background: var(--leaderboard-card-bg);
  border-radius: 15px;
  box-shadow: 0 2px 10px var(--leaderboard-card-shadow);
}

.leaderboard-type-btn {
  padding: 0.75rem 1.5rem;
  border: 2px solid transparent;
  border-radius: 10px;
  background: var(--leaderboard-hover);
  color: var(--leaderboard-text);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.leaderboard-type-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--leaderboard-card-shadow);
}

.leaderboard-type-btn.active {
  background: linear-gradient(135deg, var(--leaderboard-primary), var(--leaderboard-secondary));
  color: white;
  border-color: var(--leaderboard-primary);
}

/* =========================
   TIME PERIOD SELECTOR
   ========================= */

.period-selector {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.period-selector select {
  padding: 0.5rem 1rem;
  border: 2px solid var(--leaderboard-border);
  border-radius: 8px;
  background: var(--leaderboard-card-bg);
  color: var(--leaderboard-text);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.period-selector select:hover {
  border-color: var(--leaderboard-primary);
}

.period-selector select:focus {
  outline: none;
  border-color: var(--leaderboard-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* =========================
   CHALLENGE BANNER
   ========================= */

.challenge-banner {
  background: linear-gradient(135deg, var(--leaderboard-primary), var(--leaderboard-secondary));
  color: white;
  padding: 1.5rem;
  border-radius: 15px;
  margin-bottom: 2rem;
  text-align: center;
  box-shadow: 0 4px 15px var(--leaderboard-card-shadow);
  animation: bannerFloat 3s ease-in-out infinite;
}

@keyframes bannerFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.challenge-banner__title {
  margin: 0 0 0.5rem 0;
  font-size: clamp(1.5rem, 4vw, 1.8rem);
  font-weight: 700;
}

.challenge-banner__description {
  margin: 0;
  font-size: clamp(1rem, 3vw, 1.2rem);
  opacity: 0.95;
}

.challenge-banner__reward {
  margin: 0.5rem 0 0 0;
  font-size: 1rem;
  opacity: 0.9;
  font-weight: 600;
}

.challenge-progress {
  margin-top: 1rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  padding: 0.75rem;
}

.challenge-progress__bar-container {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  height: 20px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.challenge-progress__bar {
  background: linear-gradient(90deg, #4ade80, #22c55e);
  height: 100%;
  border-radius: 10px;
  transition: width 0.5s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

/* =========================
   USER RANK CARD
   ========================= */

.user-rank-card {
  background: linear-gradient(135deg, #f093fb, #f5576c);
  color: white;
  padding: 1.5rem;
  border-radius: 15px;
  margin-bottom: 2rem;
  text-align: center;
  box-shadow: 0 4px 15px rgba(245, 87, 108, 0.3);
  position: relative;
  overflow: hidden;
}

.user-rank-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: sparkle 4s linear infinite;
}

@keyframes sparkle {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.user-rank-card__title {
  margin: 0 0 0.5rem 0;
  font-size: 1.2rem;
  font-weight: 600;
  opacity: 0.95;
  position: relative;
  z-index: 1;
}

.user-rank-card__rank {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 800;
  margin: 0.5rem 0;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.user-rank-card__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: 1rem;
  position: relative;
  z-index: 1;
}

.user-rank-card__stat {
  font-size: clamp(0.9rem, 2.5vw, 1rem);
  font-weight: 500;
}

.rank-change {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.9rem;
  margin-left: 0.5rem;
}

.rank-change--up {
  background: rgba(74, 222, 128, 0.2);
  color: #22c55e;
}

.rank-change--down {
  background: rgba(248, 113, 113, 0.2);
  color: #ef4444;
}

.rank-change--same {
  background: rgba(156, 163, 175, 0.2);
  color: #9ca3af;
}

/* =========================
   LEADERBOARD LIST
   ========================= */

.leaderboard-section {
  background: var(--leaderboard-card-bg);
  border-radius: 15px;
  padding: 1.5rem;
  box-shadow: 0 2px 10px var(--leaderboard-card-shadow);
  margin-bottom: 2rem;
}

.leaderboard-section__title {
  margin: 0 0 1.5rem 0;
  text-align: center;
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--leaderboard-text);
  font-weight: 700;
}

.leaderboard-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* =========================
   LEADERBOARD ENTRY
   ========================= */

.leaderboard-entry {
  display: flex;
  align-items: center;
  padding: 1rem;
  background: var(--leaderboard-hover);
  border-radius: 10px;
  box-shadow: 0 2px 5px var(--leaderboard-card-shadow);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.leaderboard-entry:hover {
  transform: translateX(5px);
  box-shadow: 0 4px 12px var(--leaderboard-card-shadow);
}

.leaderboard-entry--podium {
  background: linear-gradient(135deg, #ffeaa7, #fdcb6e);
  font-weight: 600;
}

.leaderboard-entry--top1 {
  background: linear-gradient(135deg, #ffd700, #ffed4e);
  border: 2px solid var(--leaderboard-gold);
}

.leaderboard-entry--top2 {
  background: linear-gradient(135deg, #e8e8e8, #ffffff);
  border: 2px solid var(--leaderboard-silver);
}

.leaderboard-entry--top3 {
  background: linear-gradient(135deg, #d4a574, #e8b887);
  border: 2px solid var(--leaderboard-bronze);
}

.leaderboard-entry--current-user {
  border: 3px solid var(--leaderboard-accent);
  box-shadow: 0 0 20px rgba(245, 87, 108, 0.3);
}

.leaderboard-entry__rank {
  width: 60px;
  min-width: 60px;
  font-size: 1.5rem;
  font-weight: 800;
  text-align: center;
  color: var(--leaderboard-text);
}

.leaderboard-entry__rank--medal {
  font-size: 2.5rem;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.leaderboard-entry__info {
  flex: 1;
  margin-left: 1rem;
  min-width: 0;
}

.leaderboard-entry__username {
  font-weight: 700;
  font-size: clamp(1rem, 3vw, 1.1rem);
  color: var(--leaderboard-text);
  margin-bottom: 0.25rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.leaderboard-entry__stats {
  font-size: clamp(0.85rem, 2.5vw, 0.9rem);
  color: var(--leaderboard-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.leaderboard-entry__stat {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.leaderboard-entry__score-container {
  text-align: right;
  margin-left: 1rem;
  min-width: 80px;
}

.leaderboard-entry__score {
  font-size: clamp(1.2rem, 3.5vw, 1.5rem);
  font-weight: 800;
  color: var(--leaderboard-primary);
  display: block;
}

.leaderboard-entry__score-label {
  font-size: 0.75rem;
  color: var(--leaderboard-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* =========================
   NEARBY COMPETITORS
   ========================= */

.nearby-competitors {
  margin-top: 2rem;
}

.nearby-competitors__title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--leaderboard-text);
  margin: 0 0 1rem 0;
  text-align: center;
}

/* =========================
   INSIGHTS SECTION
   ========================= */

.leaderboard-insights {
  background: linear-gradient(135deg, #e0f2fe, #bae6fd);
  padding: 1.5rem;
  border-radius: 15px;
  margin-bottom: 2rem;
  color: #0c4a6e;
}

.dark-mode .leaderboard-insights {
  background: linear-gradient(135deg, #1e3a5f, #2d5a7b);
  color: #bae6fd;
}

.leaderboard-insights__title {
  margin: 0 0 1rem 0;
  font-size: 1.3rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.leaderboard-insights__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.leaderboard-insights__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  font-weight: 500;
}

.dark-mode .leaderboard-insights__item {
  background: rgba(0, 0, 0, 0.2);
}

.leaderboard-insights__icon {
  font-size: 1.5rem;
}

/* =========================
   LOADING & EMPTY STATES
   ========================= */

.leaderboard-loading {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--leaderboard-text-muted);
}

.leaderboard-loading__spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--leaderboard-border);
  border-top-color: var(--leaderboard-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

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

.leaderboard-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--leaderboard-text-muted);
}

.leaderboard-empty__icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.leaderboard-empty__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
}

.leaderboard-empty__message {
  font-size: 1rem;
  margin: 0;
}

/* =========================
   PAGINATION
   ========================= */

.leaderboard-pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.leaderboard-pagination__btn {
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--leaderboard-border);
  border-radius: 8px;
  background: var(--leaderboard-card-bg);
  color: var(--leaderboard-text);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.leaderboard-pagination__btn:hover:not(:disabled) {
  border-color: var(--leaderboard-primary);
  background: var(--leaderboard-primary);
  color: white;
  transform: translateY(-2px);
}

.leaderboard-pagination__btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.leaderboard-pagination__btn--active {
  background: var(--leaderboard-primary);
  color: white;
  border-color: var(--leaderboard-primary);
}

/* =========================
   HOW IT WORKS SECTION
   ========================= */

.how-it-works {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--leaderboard-hover);
  border-radius: 15px;
}

.how-it-works__title {
  margin: 0 0 1rem 0;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--leaderboard-text);
}

.how-it-works__list {
  line-height: 1.8;
  color: var(--leaderboard-text-muted);
  padding-left: 1.5rem;
}

.how-it-works__list li {
  margin-bottom: 0.5rem;
}

.how-it-works__list strong {
  color: var(--leaderboard-text);
  font-weight: 700;
}

/* =========================
   RESPONSIVE DESIGN
   ========================= */

@media (max-width: 768px) {
  .leaderboard-entry {
    flex-wrap: wrap;
  }
  
  .leaderboard-entry__rank {
    width: 50px;
    min-width: 50px;
    font-size: 1.2rem;
  }
  
  .leaderboard-entry__rank--medal {
    font-size: 2rem;
  }
  
  .leaderboard-entry__info {
    margin-left: 0.75rem;
  }
  
  .leaderboard-entry__score-container {
    flex: 0 0 100%;
    text-align: center;
    margin: 0.75rem 0 0 0;
    padding-top: 0.75rem;
    border-top: 1px solid var(--leaderboard-border);
  }
  
  .user-rank-card__stats {
    gap: 0.5rem;
  }
  
  .leaderboard-type-selector {
    gap: 0.5rem;
  }
  
  .leaderboard-type-btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .leaderboard-container {
    padding: 0 0.5rem;
  }
  
  .leaderboard-entry {
    padding: 0.75rem;
  }
  
  .challenge-banner {
    padding: 1rem;
  }
}

/* =========================
   ACCESSIBILITY
   ========================= */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.leaderboard-entry:focus-within {
  outline: 3px solid var(--leaderboard-primary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
select:focus-visible {
  outline: 3px solid var(--leaderboard-primary);
  outline-offset: 2px;
}

/* =========================
   ANIMATIONS
   ========================= */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.leaderboard-entry {
  animation: fadeIn 0.3s ease-out backwards;
}

.leaderboard-entry:nth-child(1) { animation-delay: 0.05s; }
.leaderboard-entry:nth-child(2) { animation-delay: 0.1s; }
.leaderboard-entry:nth-child(3) { animation-delay: 0.15s; }
.leaderboard-entry:nth-child(4) { animation-delay: 0.2s; }
.leaderboard-entry:nth-child(5) { animation-delay: 0.25s; }
.leaderboard-entry:nth-child(n+6) { animation-delay: 0.3s; }

/* =========================
   UTILITY CLASSES
   ========================= */

.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 2rem;
}

.mb-2 {
  margin-bottom: 2rem;
}