/* ── Design System & Variables ────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  /* Color Palette - Dark Premium Theme */
  --bg-dark: #090a0f;
  --bg-card: rgba(22, 26, 38, 0.75);
  --bg-card-hover: rgba(30, 36, 52, 0.85);
  --bg-glass: rgba(18, 22, 34, 0.65);
  --bg-input: #121624;
  --bg-modal: #101420;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(255, 94, 0, 0.3);
  
  --primary: #ff5e00;
  --primary-hover: #ff7728;
  --primary-glow: rgba(255, 94, 0, 0.25);
  --secondary: #00d2ff;
  --secondary-glow: rgba(0, 210, 255, 0.25);
  --accent-green: #00e676;
  --accent-purple: #9d4edd;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --shadow-glow: 0 0 20px rgba(255, 94, 0, 0.3);

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset & Global ───────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  overflow-x: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Background Glowing Gradient Effects */
body::before {
  content: '';
  position: fixed;
  top: -10%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(255, 94, 0, 0.12) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: '';
  position: fixed;
  bottom: -10%;
  right: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(0, 210, 255, 0.08) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.02em;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: inherit;
  color: var(--text-main);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  outline: none;
  transition: var(--transition-fast);
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* ── Layout & Header ──────────────────────────────────────────────── */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 10, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 1.5rem;
}

.header-content {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary) 0%, #ff0055 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: var(--shadow-glow);
}

.brand-title {
  font-size: 1.35rem;
  background: linear-gradient(135deg, #ffffff 30%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.65rem;
  padding: 2px 8px;
  background: rgba(0, 210, 255, 0.15);
  color: var(--secondary);
  border: 1px solid rgba(0, 210, 255, 0.3);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
}

/* Nav Tabs */
.nav-tabs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 4px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.nav-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.nav-btn.active {
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary) 0%, #e04800 100%);
  box-shadow: 0 4px 15px rgba(255, 94, 0, 0.3);
}

/* Main Content Area */
.main-content {
  flex: 1;
  max-width: 1300px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.3s ease-in-out;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── UI Components & Glass Cards ──────────────────────────────────── */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition-normal);
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #d84500 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 94, 0, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.btn-accent {
  background: linear-gradient(135deg, var(--secondary) 0%, #0099cc 100%);
  color: #000;
  font-weight: 700;
  box-shadow: 0 4px 20px var(--secondary-glow);
}

.btn-accent:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: capitalize;
}

.badge-primary {
  background: rgba(255, 94, 0, 0.15);
  color: var(--primary);
  border: 1px solid rgba(255, 94, 0, 0.3);
}

.badge-secondary {
  background: rgba(0, 210, 255, 0.15);
  color: var(--secondary);
  border: 1px solid rgba(0, 210, 255, 0.3);
}

.badge-green {
  background: rgba(0, 230, 118, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(0, 230, 118, 0.3);
}

/* ── Routine Generator View ───────────────────────────────────────── */
.generator-header {
  margin-bottom: 2rem;
  text-align: center;
}

.generator-header h2 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

.generator-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
}

@media (max-width: 992px) {
  .generator-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-select, .form-input {
  width: 100%;
}

.routine-days-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.day-card {
  background: rgba(18, 22, 34, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.day-header {
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.day-title {
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.exercise-list {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.exercise-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.exercise-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 94, 0, 0.3);
}

.exercise-thumb {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: #000;
}

.exercise-info {
  flex: 1;
}

.exercise-name {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.exercise-meta {
  display: flex;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.exercise-params {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.param-badge {
  background: rgba(255, 255, 255, 0.06);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
}

/* ── Calendar & Tracker View ──────────────────────────────────────── */
.calendar-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
}

@media (max-width: 992px) {
  .calendar-layout {
    grid-template-columns: 1fr;
  }
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.5rem;
}

.calendar-weekday {
  text-align: center;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.5rem 0;
  text-transform: uppercase;
}

.calendar-day {
  aspect-ratio: 1 / 1;
  min-height: 80px;
  background: rgba(18, 22, 34, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
}

.calendar-day:hover {
  border-color: var(--primary);
  background: rgba(255, 94, 0, 0.05);
}

.calendar-day.empty {
  background: transparent;
  border-color: transparent;
  cursor: default;
}

.calendar-day.today {
  border-color: var(--secondary);
  box-shadow: inset 0 0 0 1px var(--secondary);
}

.calendar-day.today .day-number {
  color: var(--secondary);
  font-weight: 800;
}

.day-number {
  font-size: 0.88rem;
  font-weight: 600;
}

.day-workouts-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.workout-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 6px var(--primary);
}

.stats-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background: rgba(18, 22, 34, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: #fff;
  font-family: 'Outfit', sans-serif;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── Exercise Library View ───────────────────────────────────────── */
.library-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.search-box {
  flex: 1;
  min-width: 260px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding-left: 2.75rem;
  font-size: 0.95rem;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.exercise-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.exercise-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.exercise-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.card-img-wrap {
  width: 100%;
  height: 180px;
  background: #0d1017;
  position: relative;
  overflow: hidden;
}

.card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.exercise-card:hover .card-img-wrap img {
  transform: scale(1.05);
}

.card-body {
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  text-transform: capitalize;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

/* ── Modal ────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-fast);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-modal);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 750px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  transform: scale(0.95);
  transition: var(--transition-fast);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-close {
  font-size: 1.5rem;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.modal-body {
  padding: 1.5rem;
}

.exercise-modal-media {
  width: 100%;
  max-height: 320px;
  background: #000;
  border-radius: var(--radius-md);
  object-fit: contain;
  margin-bottom: 1.25rem;
}

.instruction-steps {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.instruction-step {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.step-num {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

/* ── Live Workout Logger Overlay ─────────────────────────────────── */
.workout-logger {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-modal);
  border-top: 2px solid var(--primary);
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.8);
  z-index: 900;
  padding: 1.25rem;
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  max-height: 85vh;
  overflow-y: auto;
}

.workout-logger.active {
  transform: translateY(0);
}

.logger-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.logger-timer {
  font-family: 'Outfit', monospace;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.set-row {
  display: grid;
  grid-template-columns: 40px 1fr 1fr 40px;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.5rem;
}

/* Toasts */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--bg-modal);
  border: 1px solid var(--primary);
  color: #fff;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}