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

:root {
  --green-dark: #1a5632;
  --green-mid: #2d8a56;
  --green-light: #4caf7a;
  --green-pale: #e8f5e9;
  --sand: #f5f0e8;
  --white: #ffffff;
  --gray-100: #f7f7f7;
  --gray-200: #e5e5e5;
  --gray-400: #999;
  --gray-600: #555;
  --gray-800: #222;
  --danger: #d32f2f;
  --warning: #f9a825;
  --blue: #2196f3;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--sand);
  color: var(--gray-800);
  min-height: 100vh;
}

/* Nav */
nav {
  background: var(--green-dark);
  color: var(--white);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-right: 2rem;
  white-space: nowrap;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-left: auto;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}

.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

.nav-links {
  display: flex;
  gap: 0.25rem;
  flex: 1;
}

.nav-link {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  transition: background 0.2s, color 0.2s;
}

.nav-link:hover,
.nav-link.active {
  background: rgba(255,255,255,0.15);
  color: var(--white);
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
  font-size: 0.875rem;
}

#nav-username {
  opacity: 0.9;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-decoration: none;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--green-mid);
  color: var(--white);
}
.btn-primary:hover { background: var(--green-dark); }

.btn-danger {
  background: var(--danger);
  color: var(--white);
}
.btn-danger:hover { opacity: 0.9; }

.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
  background: rgba(255,255,255,0.2);
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.3);
}
.btn-sm:hover { background: rgba(255,255,255,0.3); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--green-mid);
  color: var(--green-mid);
}
.btn-outline:hover {
  background: var(--green-pale);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}
.btn-ghost:hover { background: var(--gray-100); }

/* Main */
#app {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
}

.hidden { display: none !important; }

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.card-header {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--green-dark);
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
  color: var(--gray-600);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--green-mid);
}

.form-group textarea {
  resize: vertical;
  min-height: 60px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
}

/* Stars */
.stars {
  display: inline-flex;
  gap: 2px;
}

.star {
  color: var(--gray-200);
  cursor: pointer;
  font-size: 1.25rem;
  transition: color 0.15s;
}

.star.filled { color: var(--warning); }
.star:hover { color: var(--warning); }

.stars-display .star {
  cursor: default;
  font-size: 0.9rem;
}

/* Auth page */
.auth-container {
  max-width: 400px;
  margin: 4rem auto;
}

.auth-container .card { padding: 2rem; }

.auth-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 0.25rem;
}

.auth-subtitle {
  text-align: center;
  color: var(--gray-400);
  margin-bottom: 2rem;
  font-size: 0.9rem;
}

.auth-toggle {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--gray-600);
}

.auth-toggle a {
  color: var(--green-mid);
  cursor: pointer;
  text-decoration: none;
  font-weight: 500;
}

/* Error/success messages */
.msg {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.msg-error {
  background: #fde8e8;
  color: var(--danger);
}

.msg-success {
  background: var(--green-pale);
  color: var(--green-dark);
}

/* Stats */
.stats-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.stat-card {
  flex: 1;
  min-width: 120px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.25rem;
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--green-dark);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Course card */
.course-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  flex-wrap: wrap;
}

.course-info { flex: 1; min-width: 200px; }

.course-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--gray-800);
}

.course-meta {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin-top: 0.2rem;
}

.course-score {
  display: inline-block;
  background: var(--green-pale);
  color: var(--green-dark);
  font-weight: 600;
  font-size: 0.8rem;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  margin-left: 0.5rem;
}

.course-user {
  font-size: 0.8rem;
  color: var(--green-mid);
  font-weight: 500;
}

.course-notes {
  font-size: 0.85rem;
  color: var(--gray-600);
  margin-top: 0.3rem;
  font-style: italic;
}

.course-photo {
  width: 80px;
  height: 80px;
  border-radius: var(--radius);
  object-fit: cover;
  flex-shrink: 0;
}

.course-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* Reactions */
.reactions-bar {
  display: flex;
  gap: 0.25rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.reaction-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.15rem 0.4rem;
  border-radius: 12px;
  border: 1px solid var(--gray-200);
  background: var(--white);
  cursor: pointer;
  font-size: 0.8rem;
  transition: border-color 0.15s, background 0.15s;
}

.reaction-btn:hover { border-color: var(--green-mid); background: var(--green-pale); }
.reaction-btn.active { border-color: var(--green-mid); background: var(--green-pale); }

.reaction-btn .count {
  font-size: 0.7rem;
  color: var(--gray-600);
}

.reaction-picker {
  display: inline-flex;
  gap: 0.15rem;
  padding: 0.15rem 0.3rem;
  border-radius: 12px;
  border: 1px dashed var(--gray-200);
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--gray-400);
}

.reaction-picker:hover { border-color: var(--gray-400); }

.reaction-emoji-list {
  display: none;
  gap: 0.15rem;
  position: absolute;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 0.3rem;
  box-shadow: var(--shadow);
  z-index: 5;
}

.reaction-emoji-list.open { display: flex; }

.reaction-emoji-list span {
  cursor: pointer;
  padding: 0.2rem;
  border-radius: 4px;
  font-size: 1rem;
}

.reaction-emoji-list span:hover { background: var(--green-pale); }

/* Comments */
.comments-toggle {
  font-size: 0.8rem;
  color: var(--gray-400);
  cursor: pointer;
  margin-top: 0.3rem;
  display: inline-block;
}

.comments-toggle:hover { color: var(--green-mid); }

.comments-section {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--gray-100);
}

.comment {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

.comment-author {
  font-weight: 600;
  color: var(--green-dark);
  white-space: nowrap;
}

.comment-body {
  color: var(--gray-600);
  word-break: break-word;
}

.comment-time {
  font-size: 0.7rem;
  color: var(--gray-400);
  white-space: nowrap;
}

.comment-delete {
  font-size: 0.7rem;
  color: var(--gray-400);
  cursor: pointer;
  margin-left: 0.3rem;
}

.comment-delete:hover { color: var(--danger); }

.comment-form {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.comment-form input {
  flex: 1;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 0.8rem;
  font-family: inherit;
}

.comment-form input:focus { outline: none; border-color: var(--green-mid); }

.comment-form button {
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
}

/* Leaderboard */
.leaderboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.lb-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.lb-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--green-dark);
  margin-bottom: 0.75rem;
}

.lb-row {
  display: flex;
  justify-content: space-between;
  padding: 0.3rem 0;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--gray-100);
}

.lb-row:last-child { border-bottom: none; }

.lb-rank {
  font-weight: 600;
  color: var(--gray-400);
  margin-right: 0.5rem;
  min-width: 1.5rem;
}

.lb-rank.gold { color: #d4a017; }
.lb-rank.silver { color: #a0a0a0; }
.lb-rank.bronze { color: #cd7f32; }

.lb-name { flex: 1; }

.lb-value {
  font-weight: 600;
  color: var(--green-dark);
}

/* Friends */
.friend-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--gray-200);
}

.friend-item:last-child { border-bottom: none; }

.friend-name {
  font-weight: 500;
}

.friend-actions {
  display: flex;
  gap: 0.5rem;
}

/* Search */
.search-box {
  position: relative;
}

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  z-index: 10;
  max-height: 200px;
  overflow-y: auto;
}

.search-result {
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.search-result:hover { background: var(--green-pale); }

/* Map */
#map-container {
  height: 500px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-top: 1rem;
}

.map-legend {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  color: var(--gray-600);
}

.legend-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 0.4rem;
  vertical-align: middle;
}

.legend-dot.mine { background: var(--green-mid); }
.legend-dot.friend { background: var(--blue); }

/* Geocode suggestions */
.geocode-results {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  max-height: 150px;
  overflow-y: auto;
  margin-top: 0.25rem;
}

.geocode-item {
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-100);
}

.geocode-item:hover { background: var(--green-pale); }

/* Section headers */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--green-dark);
}

/* Page title */
.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 1.5rem;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--gray-200);
}

.tab {
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-400);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.2s, border-color 0.2s;
}

.tab:hover { color: var(--gray-600); }
.tab.active {
  color: var(--green-dark);
  border-bottom-color: var(--green-dark);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--gray-400);
}

.empty-state p {
  margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
  .leaderboard-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  nav {
    flex-wrap: wrap;
    height: auto;
    padding: 0.75rem 1rem;
  }

  .hamburger { display: flex; }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    order: 3;
    gap: 0;
    padding-top: 0.5rem;
  }

  .nav-links.open { display: flex; }

  .nav-link {
    padding: 0.6rem 0.75rem;
    border-radius: 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  .nav-user {
    margin-left: auto;
    order: 2;
  }

  #nav-username { display: none; }

  .stats-row { flex-direction: column; }
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
  #map-container { height: 350px; }

  .course-card { flex-direction: column; }
  .course-photo { width: 100%; height: 160px; }
}