/**
 * Style.css - Responsive styles for exercise tracker
 */

:root {
  --primary-color: #ff6b35;
  --primary-dark: #d94a1f;
  --primary-light: #ff8855;
  --secondary-color: #4ecdc4;
  --success-color: #1dd1a1;
  --accent-color: #ffd93d;
  --danger-color: #ff6b6b;
  --bg-color: #0f1419;
  --bg-secondary: #1a1f2e;
  --text-primary: #ffffff;
  --text-secondary: #a8b2d1;
  --text-muted: #6b7280;
  --card-bg: #1e2639;
  --border-color: #2d3748;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.5);
  --radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ============== HEADER & PROGRESS BAR ============== */

header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  box-shadow: var(--shadow-lg);
  padding: 32px 0;
  margin-bottom: 32px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

h1 {
  font-size: 36px;
  font-weight: 800;
  color: white;
  flex-grow: 1;
  letter-spacing: -0.5px;
}

.progress-section {
  width: 100%;
  margin-top: 16px;
}

.progress-label {
  font-size: 11px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 10px;
  font-weight: 700;
  letter-spacing: 1px;
}

.progress-bar {
  width: 100%;
  height: 40px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius);
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.1);
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--secondary-color) 0%, var(--accent-color) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  font-weight: 700;
  font-size: 13px;
  transition: width 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  min-width: 2px;
  box-shadow: 0 0 20px rgba(78, 205, 196, 0.4);
}

.progress-text {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.9);
  margin-top: 10px;
  font-weight: 600;
}

/* ============== CONTROLS & SELECTORS ============== */

.controls {
  background: var(--card-bg);
  padding: 24px;
  border-radius: var(--radius);
  margin-bottom: 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.selector-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.selector-group:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

select {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 14px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
}

select:hover {
  border-color: var(--primary-color);
}

select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.2);
}

/* ============== PROGRESS MANAGEMENT ============== */

.progress-management {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 18px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
  box-shadow: 0 8px 25px rgba(255, 107, 53, 0.5);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
}

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

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

.btn-danger {
  background: linear-gradient(135deg, var(--danger-color), #ff5252);
  color: white;
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.btn-danger:hover {
  background: linear-gradient(135deg, #ff5252, var(--danger-color));
  box-shadow: 0 8px 25px rgba(255, 107, 107, 0.5);
  transform: translateY(-2px);
}

.btn-danger:active {
  transform: translateY(0);
}

#file-input {
  display: none;
}

/* ============== EXERCISE LIST ============== */

.exercise-list {
  display: grid;
  gap: 16px;
}

.completion-banner {
  background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
  color: white;
  padding: 20px;
  border-radius: var(--radius);
  font-weight: 700;
  margin-bottom: 20px;
  animation: slideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 0 30px rgba(29, 209, 161, 0.4);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.exercise-card {
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
  display: grid;
  gap: 12px;
  position: relative;
  overflow: hidden;
}

.exercise-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.exercise-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.exercise-card:hover::before {
  transform: scaleX(1);
}

.exercise-card.completed {
  background: linear-gradient(135deg, rgba(29, 209, 161, 0.1), rgba(78, 205, 196, 0.1));
  border-color: var(--success-color);
}

.exercise-card.completed::before {
  background: var(--success-color);
  transform: scaleX(1);
}

.exercise-header {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.exercise-checkbox {
  width: 24px;
  height: 24px;
  margin-top: 3px;
  cursor: pointer;
  accent-color: var(--primary-color);
  flex-shrink: 0;
  transition: var(--transition);
}

.exercise-checkbox:hover {
  transform: scale(1.1);
}

.exercise-title {
  flex: 1;
}

.exercise-title h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.exercise-card.completed .exercise-title h3 {
  color: var(--success-color);
  text-decoration: line-through;
  opacity: 0.9;
}

.requirement {
  font-size: 13px;
  color: var(--text-secondary);
  font-style: italic;
}

/* ============== VIDEO SECTION ============== */

.exercise-video {
  margin-top: 12px;
  border-radius: var(--radius);
  overflow: hidden;
}

.video-button {
  position: relative;
  width: 100%;
  height: auto;
  min-height: 120px;
  border: none;
  cursor: pointer;
  padding: 0;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 0 20px rgba(255, 107, 53, 0.2);
}

.video-button:hover {
  transform: scale(1.03);
  box-shadow: 0 0 30px rgba(255, 107, 53, 0.4);
}

.video-button img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: white;
  transition: var(--transition);
  box-shadow: 0 0 25px rgba(255, 107, 53, 0.5);
}

.video-button:hover .play-icon {
  background: white;
  color: var(--primary-color);
  transform: translate(-50%, -50%) scale(1.15);
  box-shadow: 0 0 35px rgba(255, 107, 53, 0.7);
}

.no-video {
  width: 100%;
  height: 120px;
  background: linear-gradient(135deg, var(--bg-secondary), var(--border-color));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 14px;
  border-radius: var(--radius);
  font-weight: 600;
}

/* ============== VIDEO MODAL ============== */

.video-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 16px;
  backdrop-filter: blur(3px);
}

.video-modal.active {
  display: flex;
}

.modal-content {
  background: var(--card-bg);
  border-radius: var(--radius);
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: modalSlideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-xl);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 2px solid var(--border-color);
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.1), rgba(78, 205, 196, 0.1));
}
}

.modal-header h2 {
  font-size: 20px;
  color: var(--text-primary);
  font-weight: 700;
}

.modal-close {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg-secondary);
  border-radius: 50%;
  cursor: pointer;
  font-size: 24px;
  color: var(--text-primary);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--primary-color);
  color: white;
  transform: rotate(90deg);
}

.modal-body {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

.modal-body iframe {
  width: 100%;
  height: 100%;
  min-height: 500px;
  border: none;
  border-radius: var(--radius);
}

/* ============== ERROR MESSAGE ============== */

.error {
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.1), rgba(255, 82, 82, 0.1));
  color: #ff9999;
  padding: 20px;
  border-radius: var(--radius);
  border: 2px solid var(--danger-color);
  text-align: center;
  font-weight: 600;
}

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

/* Tablet: 768px */
@media (max-width: 768px) {
  h1 {
    font-size: 24px;
  }

  .selector-group {
    grid-template-columns: 1fr;
  }

  .progress-management {
    flex-wrap: wrap;
  }

  .btn {
    flex: 1;
    justify-content: center;
  }

  .modal-body iframe {
    min-height: 300px;
  }
}

/* Mobile: 375px */
@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }

  header {
    padding: 12px 0;
    margin-bottom: 16px;
  }

  h1 {
    font-size: 20px;
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .controls {
    padding: 16px;
    margin-bottom: 16px;
  }

  .selector-group {
    gap: 12px;
  }

  .progress-bar {
    height: 28px;
  }

  .exercise-card {
    padding: 12px;
    gap: 10px;
  }

  .exercise-title h3 {
    font-size: 15px;
  }

  .requirement {
    font-size: 12px;
  }

  .play-icon {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }

  .btn {
    padding: 8px 12px;
    font-size: 12px;
  }

  .progress-management {
    gap: 6px;
  }

  .modal-content {
    border-radius: var(--radius);
  }

  .modal-body {
    padding: 12px;
  }

  .modal-body iframe {
    min-height: 250px;
  }
}

/* Desktop: 1200px+ */
@media (min-width: 1200px) {
  .selector-group {
    grid-template-columns: 1fr 1fr;
  }

  .exercise-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }

  .exercise-card {
    grid-column: span 1;
  }

  .completion-banner {
    grid-column: 1 / -1;
  }
}

/* Dark mode support - already using dark theme by default */
@media (prefers-color-scheme: dark) {
  /* Colors are already dark */
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}