/* CSS Variables */
:root {
  --green: #22c55e;
  --green-dark: #16a34a;
  --blue: #3b82f6;
  --blue-dark: #2563eb;
  --red: #ef4444;
  --red-dark: #dc2626;
  --orange: #f97316;
  --orange-dark: #ea580c;
  --yellow: #eab308;
  --purple: #a855f7;
  --gray: #6b7280;
  --gray-light: #e5e7eb;
  --bg: #f8fafc;
  --card-bg: white;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Screen Management */
.screen {
  display: none;
  min-height: 100vh;
  padding: 1rem;
  animation: fadeIn 0.3s ease-in;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Headers */
.app-header {
  text-align: center;
  padding: 2rem 0;
}

.app-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: var(--green);
}

.app-header p {
  color: var(--text-light);
  font-size: 1rem;
}

/* Category Selection */
.category-selection {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 500px;
  margin: 2rem auto;
}

.category-btn {
  background: var(--card-bg);
  border: 3px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  min-height: 120px;
  box-shadow: var(--shadow-lg);
}

.category-btn:active {
  transform: scale(0.98);
}

.category-icon {
  font-size: 3rem;
}

.category-name {
  font-size: 1.5rem;
  letter-spacing: 1px;
}

.category-desc {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-light);
}

.contact-btn {
  border-color: var(--blue);
}

.contact-btn:hover {
  background: #eff6ff;
  border-color: var(--blue-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 20px -5px rgba(59, 130, 246, 0.3);
}

.accuracy-btn {
  border-color: var(--green);
}

.accuracy-btn:hover {
  background: #f0fdf4;
  border-color: var(--green-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 20px -5px rgba(34, 197, 94, 0.3);
}

.putting-btn {
  border-color: var(--purple);
}

.putting-btn:hover {
  background: #faf5ff;
  border-color: #9333ea;
  transform: translateY(-2px);
  box-shadow: 0 12px 20px -5px rgba(168, 85, 247, 0.3);
}

/* Category Header */
.category-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.category-header h2 {
  font-size: 1.75rem;
}

/* Club Selection */
.club-selection {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  max-width: 500px;
  margin: 2rem auto;
}

.club-selection .club-btn {
  min-height: 160px;
}

.club-desc {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-light);
  margin-top: 0.25rem;
}

.club-btn {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 2rem 1rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  min-height: 140px;
  box-shadow: var(--shadow);
}

.club-btn:active {
  transform: scale(0.98);
}

.club-icon {
  font-size: 3rem;
}

.driver-btn:hover {
  border-color: var(--blue);
  background: #eff6ff;
}

.iron-btn:hover {
  border-color: var(--green);
  background: #f0fdf4;
}

.wedge-btn:hover {
  border-color: var(--orange);
  background: #fff7ed;
}

.putter-btn:hover {
  border-color: var(--purple);
  background: #faf5ff;
}

/* Buttons */
.primary-btn,
.secondary-btn,
.action-btn {
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  width: 100%;
  max-width: 400px;
  margin: 1rem auto;
  display: block;
}

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

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

.primary-btn:active {
  transform: scale(0.98);
}

.secondary-btn {
  background: var(--card-bg);
  color: var(--text);
  border: 2px solid var(--border);
}

.secondary-btn:hover {
  background: var(--gray-light);
}

.action-btn {
  background: var(--blue);
  color: white;
}

.action-btn:hover {
  background: var(--blue-dark);
}

.action-btn:disabled {
  background: var(--gray-light);
  color: var(--gray);
  cursor: not-allowed;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 2rem;
  max-width: 400px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s ease-out;
}

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

.modal-content h2 {
  margin-bottom: 1.5rem;
  text-align: center;
}

.iron-type-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.iron-type-btn {
  padding: 1rem;
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.iron-type-btn:hover {
  border-color: var(--green);
  background: #f0fdf4;
}

.iron-type-btn:active {
  transform: scale(0.95);
}

.modal-cancel,
.modal-close {
  background: var(--gray-light);
  color: var(--text);
  border: none;
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: auto;
  padding: 0.5rem 1rem;
  border-radius: 50%;
  font-size: 1.5rem;
}

/* History Screen */
.history-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.back-btn {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
}

.back-btn:hover {
  background: var(--gray-light);
}

.history-filters {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.filter-btn:hover {
  background: var(--gray-light);
}

.filter-btn.active {
  background: var(--green);
  color: white;
  border-color: var(--green);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.history-item {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow);
}

.history-item:hover {
  border-color: var(--green);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.history-club {
  font-weight: 600;
  font-size: 1.125rem;
  text-transform: capitalize;
}

.history-date {
  color: var(--text-light);
  font-size: 0.875rem;
}

.history-stats {
  display: flex;
  gap: 1rem;
}

.history-stat {
  display: flex;
  flex-direction: column;
}

.history-stat-value {
  font-weight: 600;
  font-size: 1.25rem;
}

.history-stat-label {
  color: var(--text-light);
  font-size: 0.75rem;
}

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

/* Utility Classes */
.hidden {
  display: none !important;
}

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

/* Flash Animation for Shot Buttons */
@keyframes flash {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.flash {
  animation: flash 0.3s ease-in-out;
}

/* Responsive */
@media (min-width: 768px) {
  .screen {
    padding: 2rem;
  }

  .club-selection {
    max-width: 600px;
    gap: 1.5rem;
  }

  .modal-content {
    max-width: 500px;
  }
}