/* CSS variables mirroring Telegram Web App variables with high-quality fallback dark theme */
:root {
  --tg-theme-bg-color: #17212b;
  --tg-theme-text-color: #f5f5f5;
  --tg-theme-hint-color: #708499;
  --tg-theme-link-color: #5288c1;
  --tg-theme-button-color: #5288c1;
  --tg-theme-button-text-color: #ffffff;
  --tg-theme-secondary-bg-color: #0e1621;
  
  /* Additional UI variables */
  --accent-color: #24b27f;
  --danger-color: #e53935;
  --border-radius: 12px;
  --card-bg: #202b36;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body.light-theme {
  --tg-theme-bg-color: #efeff4;
  --tg-theme-text-color: #000000;
  --tg-theme-hint-color: #8e8e93;
  --tg-theme-link-color: #007aff;
  --tg-theme-button-color: #007aff;
  --tg-theme-button-text-color: #ffffff;
  --tg-theme-secondary-bg-color: #ffffff;
  --card-bg: #f9f9fc;
}

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

body {
  background-color: var(--tg-theme-bg-color);
  color: var(--tg-theme-text-color);
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.5;
  padding: 16px;
  max-width: 600px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* UI Elements */
h1, h2, h3, h4 {
  font-weight: 600;
  margin-bottom: 12px;
}

button {
  background-color: var(--tg-theme-button-color);
  color: var(--tg-theme-button-text-color);
  border: none;
  padding: 12px 20px;
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

button:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

button.secondary {
  background-color: var(--tg-theme-secondary-bg-color);
  color: var(--tg-theme-text-color);
  border: 1px solid var(--tg-theme-hint-color);
}

button.danger {
  background-color: transparent;
  color: var(--danger-color);
  border: 1px solid var(--danger-color);
}

button.danger:hover {
  background-color: rgba(229, 57, 53, 0.08);
}

input, select, textarea {
  width: 100%;
  padding: 12px;
  background-color: var(--tg-theme-secondary-bg-color);
  border: 1px solid var(--tg-theme-hint-color);
  border-radius: var(--border-radius);
  color: var(--tg-theme-text-color);
  font-family: var(--font-family);
  font-size: 16px;
  transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--tg-theme-link-color);
  box-shadow: 0 0 0 3px rgba(82, 136, 193, 0.2);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  color: var(--tg-theme-hint-color);
  margin-bottom: 6px;
}

/* Cards & Layouts */
.card {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.app-container {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 90%;
  max-width: 400px;
}

.toast {
  background-color: var(--card-bg);
  color: var(--tg-theme-text-color);
  padding: 12px 16px;
  border-radius: var(--border-radius);
  border-left: 4px solid var(--tg-theme-link-color);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  animation: slideUp 0.3s ease-out;
}

.toast.success {
  border-left-color: var(--accent-color);
}

.toast.error {
  border-left-color: var(--danger-color);
}

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

/* Challenge Cards & Progress Bars */
.challenge-card {
  position: relative;
  transition: var(--transition);
}

.challenge-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

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

.challenge-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--tg-theme-text-color);
}

.challenge-status {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: 20px;
  background-color: rgba(36, 178, 127, 0.15);
  color: var(--accent-color);
}

.challenge-dates {
  font-size: 13px;
  color: var(--tg-theme-hint-color);
  margin-bottom: 12px;
}

.progress-wrapper {
  margin-top: 8px;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  margin-bottom: 6px;
}

.progress-percent {
  font-weight: 600;
  color: var(--tg-theme-link-color);
}

.progress-container {
  height: 8px;
  background-color: var(--tg-theme-secondary-bg-color);
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--tg-theme-link-color) 0%, var(--accent-color) 100%);
  border-radius: 10px;
  transition: width 0.4s ease;
}

.dashboard-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.dashboard-header-row h2 {
  margin-bottom: 0;
}

.btn-small {
  padding: 6px 12px;
  font-size: 14px;
}

/* Clickable challenge cards */
.challenge-card {
  cursor: pointer;
}

/* Challenge Detail Styles */
.challenge-detail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.countdown-timer {
  font-size: 14px;
}

.add-workout-btn {
  background: linear-gradient(90deg, var(--tg-theme-link-color) 0%, var(--accent-color) 100%);
  color: var(--tg-theme-button-text-color);
  width: 100%;
}

.workout-list-item {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 12px 16px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.workout-list-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Modal Overlay Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease-out;
}

.modal-content {
  background-color: var(--card-bg);
  padding: 24px;
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 400px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  position: relative;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--tg-theme-hint-color);
  font-size: 28px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--tg-theme-text-color);
}

/* Achievement Popup Styles */
.achievement-popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1001;
  animation: fadeIn 0.3s ease-out;
}

.achievement-popup-card {
  background-color: var(--card-bg);
  padding: 32px 24px;
  border-radius: 20px;
  width: 85%;
  max-width: 320px;
  text-align: center;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  position: relative;
  border: 2px solid transparent;
  background-image: linear-gradient(var(--card-bg), var(--card-bg)), linear-gradient(135deg, #FFD700, #FFA500, #FF6347);
  background-origin: border-box;
  background-clip: content-box, border-box;
  animation: scaleUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}

.achievement-icon {
  font-size: 64px;
  margin-bottom: 16px;
  display: inline-block;
  animation: pulse 2s infinite ease-in-out;
}

.achievement-auto-close-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, #FFD700, #FFA500);
  animation: shrink 5s linear forwards;
}

.badge-failed {
  background-color: var(--danger-color) !important;
  color: white !important;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleUp {
  from { transform: scale(0.8); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); filter: drop-shadow(0 0 8px rgba(255, 215, 0, 0.6)); }
  100% { transform: scale(1); }
}

@keyframes shrink {
  from { width: 100%; }
  to { width: 0%; }
}

/* Achievements Grid in Challenge Detail */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.achievement-grid-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  padding: 8px;
  background-color: var(--tg-theme-secondary-bg-color);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.achievement-grid-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.achievement-grid-item .ach-icon {
  font-size: 28px;
  margin-bottom: 4px;
}

.achievement-grid-item .ach-name {
  font-size: 10px;
  color: var(--tg-theme-hint-color);
  font-weight: 500;
  line-height: 1.2;
}

.achievement-grid-item.locked {
  opacity: 0.3;
  filter: grayscale(100%);
}