/* ============================================================
   w-out — Design System & App Styles
   ============================================================ */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Colors — Dark theme */
  --color-bg: #0f172a;
  --color-bg-elevated: #1e293b;
  --color-bg-card: #1e293b;
  --color-bg-input: #334155;
  --color-surface: #475569;
  --color-border: #334155;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-text-dim: #64748b;

  /* Accent */
  --color-primary: #6366f1;
  --color-primary-rgb: 99, 102, 241;
  --color-primary-hover: #818cf8;
  --color-accent: #06b6d4;
  --color-accent-rgb: 6, 182, 212;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  /* 12px */
  --font-size-sm: 0.8125rem;
  /* 13px */
  --font-size-md: 0.9375rem;
  /* 15px */
  --font-size-lg: 1.125rem;
  /* 18px */
  --font-size-xl: 1.5rem;
  /* 24px */
  --font-size-2xl: 2rem;
  /* 32px */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(var(--color-primary-rgb), 0.3);

  /* Layout */
  --header-height: 56px;
  --nav-height: 64px;
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-top: env(safe-area-inset-top, 0px);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-regular);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  /* Prevent pull-to-refresh on iOS in standalone mode */
  overscroll-behavior-y: contain;
}

a {
  color: inherit;
  text-decoration: none;
}

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

input,
select,
textarea {
  font: inherit;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

img,
svg {
  display: block;
  max-width: 100%;
}

/* ============================================================
   App Shell Layout
   ============================================================ */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  min-height: -webkit-fill-available;
}

/* --- Header --- */
#app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-md);
  padding-top: var(--safe-area-top);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

.icon-btn:hover {
  background: var(--color-bg-elevated);
}

.icon-btn:active {
  background: var(--color-surface);
}

/* --- Page Container --- */
#page-container {
  flex: 1;
  padding: var(--space-md);
  padding-bottom: calc(var(--nav-height) + var(--safe-area-bottom) + var(--space-md));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* Page enter animation */
.page-enter {
  animation: pageEnter var(--transition-base) ease-out;
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Bottom Navigation --- */
#bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: calc(var(--nav-height) + var(--safe-area-bottom));
  padding-bottom: var(--safe-area-bottom);
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--color-border);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-text-dim);
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  min-width: 64px;
}

.nav-item.active {
  color: var(--color-primary);
}

.nav-item:active {
  transform: scale(0.92);
}

.nav-icon {
  width: 24px;
  height: 24px;
}

.nav-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* ============================================================
   Component Utilities
   ============================================================ */

/* --- Card --- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-highlight {
  background: linear-gradient(135deg,
      rgba(var(--color-primary-rgb), 0.12),
      rgba(var(--color-accent-rgb), 0.08));
  border-color: rgba(var(--color-primary-rgb), 0.3);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px var(--space-lg);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  min-height: 48px;
  /* iOS touch target */
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #4f46e5);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-hover), #6366f1);
  transform: translateY(-1px);
  box-shadow: 0 0 28px rgba(var(--color-primary-rgb), 0.4);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
}

.btn-ghost:hover {
  background: rgba(var(--color-primary-rgb), 0.1);
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 8px var(--space-md);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

/* --- Form Inputs --- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
}

.form-input,
.form-select {
  width: 100%;
  padding: 12px var(--space-md);
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 16px;
  /* prevent iOS zoom */
  min-height: 48px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.2);
}

.form-input::placeholder {
  color: var(--color-text-dim);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

/* --- Toggle Switch --- */
.toggle {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
  cursor: pointer;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  transition: transform var(--transition-fast);
}

.toggle input:checked+.toggle-slider {
  background: var(--color-primary);
}

.toggle input:checked+.toggle-slider::before {
  transform: translateX(22px);
}

/* --- Lists --- */
.list-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

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

.list-item:active {
  background: var(--color-bg-elevated);
}

/* --- Chip / Tag --- */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  background: rgba(var(--color-primary-rgb), 0.15);
  color: var(--color-primary-hover);
}

/* --- Stat Block --- */
.stat {
  text-align: center;
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* --- Section heading --- */
.section-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

/* --- Empty state --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
  color: var(--color-text-dim);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  opacity: 0.4;
}

/* ============================================================
   Layout Utilities
   ============================================================ */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

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

.justify-between {
  justify-content: space-between;
}

.gap-xs {
  gap: var(--space-xs);
}

.gap-sm {
  gap: var(--space-sm);
}

.gap-md {
  gap: var(--space-md);
}

.gap-lg {
  gap: var(--space-lg);
}

.text-dim {
  color: var(--color-text-dim);
}

.text-sm {
  font-size: var(--font-size-sm);
}

.text-lg {
  font-size: var(--font-size-lg);
}

.fw-medium {
  font-weight: var(--font-weight-medium);
}

.fw-semibold {
  font-weight: var(--font-weight-semibold);
}

.mt-md {
  margin-top: var(--space-md);
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-md {
  margin-bottom: var(--space-md);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

/* Grid for stats */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

/* ============================================================
   Desktop / Tablet Responsive
   ============================================================ */
@media (min-width: 768px) {
  #page-container {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--space-lg);
    padding-bottom: calc(var(--nav-height) + var(--space-lg));
  }
}

@media (min-width: 1024px) {
  :root {
    --nav-height: 0px;
    /* Hide bottom nav on desktop */
  }

  #app {
    flex-direction: row;
    padding-left: 220px;
  }

  #app-header {
    display: none;
    /* Use side nav title instead */
  }

  /* Convert bottom nav to sidebar on desktop */
  #bottom-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: auto;
    width: 220px;
    height: 100vh;
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-lg) var(--space-sm);
    padding-top: var(--space-xl);
    gap: var(--space-xs);
    border-top: none;
    border-right: 1px solid var(--color-border);
    background: rgba(15, 23, 42, 0.95);
  }

  #bottom-nav::before {
    content: 'w-out';
    display: block;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    padding: 0 var(--space-md);
    margin-bottom: var(--space-lg);
  }

  .nav-item {
    flex-direction: row;
    justify-content: flex-start;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    width: 100%;
  }

  .nav-item.active {
    background: rgba(var(--color-primary-rgb), 0.1);
  }

  .nav-label {
    font-size: var(--font-size-md);
  }

  #page-container {
    margin: 0 auto;
    max-width: 900px;
    padding: var(--space-xl);
    padding-bottom: var(--space-xl);
  }
}

/* ============================================================
   Modal
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.modal {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: var(--space-lg);
  padding-bottom: calc(var(--space-lg) + var(--safe-area-bottom));
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
  transform: translateY(100%);
  transition: transform var(--transition-base) ease-out;
}

.modal-overlay.modal-visible .modal {
  transform: translateY(0);
}

@media (min-width: 768px) {
  .modal-overlay {
    align-items: center;
  }

  .modal {
    border-radius: var(--radius-lg);
    max-height: 80vh;
  }
}

/* ============================================================
   Exercise Card & Set Tracking
   ============================================================ */
.exercise-card {
  overflow: hidden;
}

.exercise-card-header {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.exercise-chevron {
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.exercise-card.collapsed .exercise-chevron {
  transform: rotate(-90deg);
}

.exercise-sets {
  display: flex;
  flex-direction: column;
  margin-top: var(--space-sm);
  transition: max-height var(--transition-base) ease, opacity var(--transition-fast);
}

.exercise-card.collapsed .exercise-sets {
  display: none;
}

/* Set header */
.set-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 2px solid var(--color-surface);
  margin-bottom: 4px;
}

.set-header span {
  font-size: var(--font-size-xs);
  color: var(--color-text-dim);
  font-weight: var(--font-weight-medium);
  text-align: center;
}

/* Set row */
.set-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid rgba(51, 65, 85, 0.2);
}

.ghost-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0 6px 0;
  opacity: 0.7;
  font-style: italic;
}

.ghost-label {
  font-size: 10px;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  color: var(--color-text-dim);
  text-align: right;
  padding-right: 4px;
}

.set-row:last-of-type {
  border-bottom: none;
}

.set-col-num {
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.set-col-type {
  width: 50px;
  text-align: center;
  flex-shrink: 0;
}

.set-col-weight {
  width: 65px;
  flex-shrink: 0;
  position: relative;
}

.set-col-reps {
  flex: 1;
  min-width: 45px;
  text-align: center;
}

/* Ensure inputs don't feel too cramped */
.set-input {
  width: 100%;
  padding: 6px 2px;
  background: var(--color-bg-input);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 13px;
  text-align: center;
  -webkit-appearance: none;
  appearance: none;
  min-height: 0;
}

.set-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(var(--color-primary-rgb), 0.2);
}

/* Remove spinner from number inputs on mobile */
.set-input::-webkit-inner-spin-button,
.set-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.set-input[type='number'] {
  appearance: textfield;
  -moz-appearance: textfield;
}

/* Type toggle pill */
.set-type-toggle {
  width: 42px;
  height: 26px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
}

.set-working {
  background: rgba(245, 158, 11, 0.2);
  color: var(--color-warning);
}

.set-warmup {
  background: rgba(var(--color-primary-rgb), 0.2);
  color: var(--color-primary-hover);
}

.intensity-up {
  background: rgba(34, 197, 94, 0.15) !important;
  border-left: 3px solid var(--color-success);
}

.intensity-down {
  background: rgba(245, 158, 11, 0.1) !important;
  border-left: 3px solid var(--color-warning);
}

.intensity-row-up {
  background: rgba(34, 197, 94, 0.1) !important;
  border-right: 4px solid var(--color-success) !important;
}

.intensity-row-down {
  background: rgba(245, 158, 11, 0.08) !important;
  border-right: 4px solid var(--color-warning) !important;
}

/* Chip active state (for exercise selection) */
.chip-active {
  background: rgba(var(--color-primary-rgb), 0.3);
  opacity: 0.6;
}

.exercise-chip {
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.exercise-chip:not(.chip-active):hover {
  background: rgba(var(--color-primary-rgb), 0.25);
}

.exercise-chip:disabled {
  cursor: default;
}

/* Selected exercise row */
.selected-ex-row {
  padding: 6px var(--space-sm);
  background: var(--color-bg-input);
  border-radius: var(--radius-sm);
}

/* Template card hover */
.template-card {
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.template-card:hover {
  transform: translateY(-1px);
}

/* ============================================================
   Scrollbar (Desktop)
   ============================================================ */
@media (min-width: 768px) {
  ::-webkit-scrollbar {
    width: 6px;
  }

  ::-webkit-scrollbar-track {
    background: transparent;
  }

  ::-webkit-scrollbar-thumb {
    background: var(--color-surface);
    border-radius: var(--radius-full);
  }

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

/* --- Utilities --- */
.text-center { text-align: center; }
.text-success { color: var(--color-success) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-warning { color: var(--color-warning) !important; }
.ml-xs { margin-left: var(--space-xs); }
.hidden { display: none !important; }
.btn-icon {
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-dim);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}
.btn-icon:hover { background: var(--color-surface); }

/* --- Measurements Table --- */
.table-container {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--color-bg);
}

.measure-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  white-space: nowrap;
}

.measure-table th,
.measure-table td {
  padding: 12px 16px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.measure-table th {
  background: var(--color-surface);
  color: var(--color-text-dim);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.05em;
}

.measure-table .sticky-col {
  position: sticky;
  left: 0;
  background: var(--color-bg);
  z-index: 10;
  text-align: left;
  border-right: 1px solid var(--color-border);
}

.measure-table th.sticky-col {
  background: var(--color-surface);
}

.measure-diff {
  font-size: 10px;
  font-weight: 700;
  margin-top: 2px;
}

.measure-up {
  background: rgba(34, 197, 94, 0.08);
}
.measure-up .measure-diff {
  color: var(--color-success);
}

.measure-down {
  background: rgba(245, 158, 11, 0.08);
}
.measure-down .measure-diff {
  color: var(--color-warning);
}