:root {
  color-scheme: dark;
  --bg: #09090b;
  --panel: rgba(24, 24, 27, 0.6);
  --panel-2: rgba(39, 39, 42, 0.6);
  --inner-panel: rgba(0, 0, 0, 0.4);
  --text: #fafafa;
  --text-muted: #a1a1aa;
  --accent: #FF6B00;
  --danger: #f06d6d;
  --border: rgba(255, 255, 255, 0.08);
  --accent-glow: rgba(255, 107, 0, 0.4);
  --glass-bg: rgba(24, 24, 27, 0.6);
  --topbar-bg: rgba(9, 9, 11, 0.85);
  --shadow-color: rgba(0, 0, 0, 0.5);
  --sidebar-bg: #0e0e11;
  --input-bg: rgba(0, 0, 0, 0.6);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f8fafc;
  --panel: rgba(255, 255, 255, 0.75);
  --panel-2: rgba(255, 255, 255, 0.95);
  --inner-panel: rgba(241, 245, 249, 0.8);
  --text: #0f172a;
  --text-muted: #475569;
  --accent: #e66000;
  --danger: #dc2626;
  --border: rgba(15, 23, 42, 0.12);
  --accent-glow: rgba(255, 107, 0, 0.15);
  --glass-bg: rgba(255, 255, 255, 0.75);
  --topbar-bg: rgba(255, 255, 255, 0.95);
  --shadow-color: rgba(15, 23, 42, 0.1);
  --sidebar-bg: #ffffff;
  --input-bg: rgba(255, 255, 255, 0.9);
}

:root[data-theme="dark"] .sun-icon { display: block; }
:root[data-theme="dark"] .moon-icon { display: none; }
:root[data-theme="light"] .sun-icon { display: none; }
:root[data-theme="light"] .moon-icon { display: block; }

html {
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Background Effects */
.ambient-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  background: var(--accent-glow);
  filter: blur(140px);
  border-radius: 50%;
  z-index: -1;
  opacity: 0.5;
  top: -150px;
  left: -200px;
  transition: background 0.3s ease;
  pointer-events: none;
}

.ambient-glow-2 {
  background: var(--text-muted);
  opacity: 0.1;
  top: 40%;
  right: -200px;
  left: auto;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Outfit', Inter, Segoe UI, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  padding-top: 64px;
}

body.mobile-nav-open {
  overflow: hidden;
}

.mobile-bar {
  display: none;
}

.mobile-backdrop {
  display: none;
}

.mobile-backdrop.hidden {
  display: none;
  pointer-events: none;
}

.page {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: calc(100vh - 57px);
  align-items: start;
}

/* Auth Page */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 57px);
  padding: 2rem;
  background: radial-gradient(circle at top left, var(--accent-glow) 0%, transparent 40%),
              radial-gradient(circle at bottom right, rgba(255,107,0,0.05) 0%, transparent 40%);
}

.auth-card {
  width: 100%;
  max-width: 440px;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  box-shadow: 0 24px 48px -12px var(--shadow-color);
  animation: authCardEnter 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.auth-card-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.auth-card-header h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.auth-card-header .brand {
  margin-bottom: 0.5rem;
}

.auth-card-header .brand-name {
  font-size: 1.5rem;
}

.sidebar {
  border-right: 1px solid var(--border);
  padding: 16px;
  background: var(--sidebar-bg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.theme-toggle-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 8px;
}

.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: color 0.2s ease, background 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  color: var(--text);
  background: var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 6px 2px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 24px;
  font-weight: 700;
}

.logo:hover {
  filter: none;
  color: #bcd8ff;
}

.logo-mark {
  color: var(--accent);
  font-size: 16px;
}

.logo-text {
  line-height: 1;
}

.auth-panel {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  backdrop-filter: blur(12px);
  margin-top: auto;
}

.auth-form {
  display: grid;
  gap: 10px;
}

.auth-mode-toggle {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--input-bg);
  width: 100%;
}

/* Dashboard Layout */
.dashboard {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  animation: fadeIn 0.4s ease-out;
}

.dashboard-header {
  margin-bottom: 1rem;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
}

.dashboard-section h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
}

/* Template Cards */
.template-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.template-card {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  text-align: left;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s, background 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}

.template-card:hover {
  transform: translateY(-4px);
  background: var(--panel);
  box-shadow: 0 12px 24px -12px rgba(255,107,0,0.2);
}

.template-card strong {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent);
}

.exercise-preview {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 0.25rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.stats-horizontal {
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 1rem;
}

.performance-section {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem;
}

.performance-section .panel-header {
  margin-bottom: 1.5rem;
}

.performance-section .dashboard-chart-container {
  border: none;
  background: rgba(0,0,0,0.1);
  padding: 0;
  margin-top: 0;
}

.stat-card {
  padding: 1.25rem;
  background: var(--panel);
  border-radius: 12px;
  border: 1px solid var(--border);
}

@media (max-width: 768px) {
  .stats-horizontal {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
  }
  
  .performance-section {
    padding: 1rem;
  }

  .stat-card {
    padding: 0.6rem 0.25rem;
    text-align: center;
    min-width: 0;
  }

  .stat-card .label {
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    opacity: 0.7;
    margin-bottom: 2px;
  }

  .stat-card .value {
    font-size: 0.85rem;
    font-weight: 800;
  }
}

.stat-card .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.stat-card .value {
  font-size: 1.5rem;
  font-weight: 800;
}

.mt-2 { margin-top: 2rem; }

@media (max-width: 1100px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

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

.auth-mode-button {
  background: transparent;
  color: var(--text-muted);
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.auth-mode-button.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(255, 107, 0, 0.2);
}

.auth-actions {
  justify-content: flex-end;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  margin-top: 1rem;
}

.session-summary {
  display: grid;
  gap: 6px;
}

.dashboard-chart-container {
  width: 100%;
  height: 350px;
  background: var(--panel-2);
  border-radius: 16px;
  border: 1px solid var(--border);
  padding: 1rem;
  margin-top: 1rem;
}

.session-card {
  display: grid;
  gap: 4px;
}

.role-pill {
  width: fit-content;
  padding: 2px 8px;
  border: 1px solid rgba(95, 168, 255, 0.25);
  border-radius: 999px;
  font-size: 11px;
  color: var(--accent);
  background: rgba(95, 168, 255, 0.1);
}

.main {
  padding: 20px;
  display: grid;
  gap: 16px;
  min-width: 0;
  align-content: start;
}

.actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

#builder-view {
  display: grid;
  gap: 16px;
  align-content: start;
  grid-auto-rows: max-content;
}

#builder-view.hidden {
  display: none;
}

.card {
  background: var(--panel);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.browse-view {
  display: grid;
  gap: 16px;
}

.browse-view.hidden {
  display: none;
}

.browse-header {
  align-items: start;
}

.browse-toolbar {
  display: grid;
  gap: 10px;
}

.browse-search {
  max-width: 520px;
}

.browse-search input {
  margin-top: 4px;
}

.browse-results-meta {
  min-height: 16px;
}

.browse-list {
  gap: 12px;
}

.main-header,
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

button {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 11px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

button:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

button.primary {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 4px 14px 0 rgba(255, 107, 0, 0.2);
}

button.primary:hover {
  box-shadow: 0 6px 20px 0 rgba(255, 107, 0, 0.3);
}

button.ghost {
  background: transparent;
  border-color: transparent;
}

button.ghost:hover {
  background: var(--border);
}

button.danger {
  color: var(--danger);
}

input,
textarea,
select {
  width: 100%;
  background: var(--input-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-family: inherit;
}

select {
  appearance: none;
}

.select-shell {
  position: relative;
  display: block;
}

.select-shell::after {
  content: '▾';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  font-size: 12px;
}

.auth-select-shell select {
  padding-right: 32px;
  background: var(--input-bg);
}

label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

.help {
  color: var(--muted);
  margin-top: 6px;
  font-size: 13px;
}

.help.compact {
  margin-top: 0;
  margin-bottom: 4px;
}

.workout-list {
  display: grid;
  gap: 8px;
}

.home-template-buttons {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.home-template-btn {
  text-align: left;
  padding: 12px;
  display: grid;
  gap: 4px;
}

.workout-list.focused {
  outline: 1px solid #3b7dd1;
  outline-offset: 6px;
  border-radius: 8px;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 6px 0;
}

.workout-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  background: var(--inner-panel);
  display: grid;
  gap: 8px;
}

.workout-item.read-only {
  border-style: dashed;
}

.section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.owner-note {
  font-size: 12px;
  color: var(--muted);
}

.muted {
  color: var(--muted);
  font-size: 12px;
}

.muted.warning {
  color: #ffd06b;
}

.row-actions {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}

.sidebar-view-all {
  margin-top: 8px;
  width: 100%;
  justify-self: start;
  padding: 8px 0 0;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--accent);
  text-align: left;
  font-weight: 600;
}

.sidebar-view-all:hover {
  background: transparent;
  filter: brightness(1.05);
  transform: none;
  text-decoration: underline;
}

.exercise-editor-form {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 180px;
  gap: 10px;
  margin-bottom: 12px;
  align-items: end;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 12, 0.72);
  display: grid;
  place-items: center;
  padding: 18px;
  z-index: 1200;
}

.modal-card {
  width: min(680px, 100%);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  background: var(--panel);
  backdrop-filter: blur(16px);
  box-shadow: 0 24px 64px -12px var(--shadow-color);
}

.guided-workout-modal-card {
  width: min(760px, 100%);
  display: grid;
  gap: 16px;
}

.guided-workout-header {
  align-items: start;
}

.guided-workout-step-label {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.guided-workout-progress {
  width: fit-content;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--inner-panel);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

.guided-workout-panel {
  display: grid;
  gap: 14px;
}

.guided-workout-exercises {
  display: grid;
  gap: 12px;
}

.guided-workout-exercise {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--inner-panel);
}

.guided-workout-exercise-header {
  display: grid;
  gap: 4px;
}

.guided-workout-exercise-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.guided-workout-exercise-title {
  min-width: 0;
}

.guided-workout-exercise-header strong {
  font-size: 16px;
}

.guided-workout-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.guided-workout-exercise-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.guided-workout-history-button {
  min-height: 28px;
  padding: 4px 10px;
  font-size: 12px;
}

.guided-rest-display {
  display: grid;
  gap: 8px;
  justify-items: center;
  text-align: center;
  padding: 20px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--inner-panel);
}

.guided-rest-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.guided-rest-time {
  font-size: clamp(42px, 8vw, 64px);
  line-height: 1;
}

.guided-rest-actions {
  justify-content: center;
}

.guided-workout-footer {
  justify-content: space-between;
}

.guided-workout-footer .primary.hidden {
  display: none !important;
}

.toast-root {
  position: fixed;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1400;
  pointer-events: none;
  width: min(calc(100vw - 24px), 480px);
}

.toast {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--accent);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  color: var(--text);
  box-shadow: 0 18px 44px var(--shadow-color);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  opacity: 0;
  transform: translateY(-8px) scale(0.98);
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

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

.builder-actions-bottom {
  justify-content: flex-end;
  padding: 4px 0 16px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.check-row input {
  width: auto;
}

.muscle-group-picker {
  margin: 10px 0;
}

.muscle-group-label {
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 8px 0;
}

.muscle-group-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.muscle-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel-2);
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  transition: border-color 0.12s, background 0.12s, color 0.12s;
}

.muscle-chip input {
  display: none;
}

.muscle-chip.selected {
  border-color: var(--accent);
  background: rgba(95, 168, 255, 0.12);
  color: var(--accent);
}

.muscle-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}

.muscle-tag {
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 12px;
  background: rgba(95, 168, 255, 0.1);
  color: var(--accent);
  border: 1px solid rgba(95, 168, 255, 0.25);
}

.hidden {
  display: none !important;
}

.mode-badge {
  color: var(--muted);
  font-size: 13px;
  margin-left: 8px;
}

.disabled-shell {
  opacity: 0.7;
}

.readonly-banner {
  color: #ffd06b;
}

.full-width {
  width: 100%;
}

.recent-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (max-width: 1100px) {
  .recent-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .template-grid,
  .recent-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .template-card {
    padding: 1rem;
    gap: 0.4rem;
  }

  .template-card strong {
    font-size: 1rem;
  }
}

.workout-card {
  border-left-color: #5fa8ff; /* Subtler blue for history */
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
}

.auth-form input,
.auth-form select {
  padding: 0.75rem 1rem;
  border-radius: 12px;
}


@media (max-width: 1000px) {
  .exercise-editor-form {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .ambient-glow {
    display: none;
  }

  .toast-root {
    top: 82px;
    width: min(calc(100vw - 24px), 460px);
  }

  .builder-actions-bottom {
    position: sticky;
    bottom: 12px;
    z-index: 20;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--topbar-bg);
    backdrop-filter: blur(12px);
  }

  #mobile-nav-toggle {
    display: flex;
  }

  .mobile-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 1090;
    background: rgba(2, 6, 12, 0.58);
    pointer-events: auto;
  }

  .page {
    grid-template-columns: 1fr;
    min-height: calc(100vh - 57px);
  }

  .page {
    position: relative;
  }

  .sidebar {
    position: fixed;
    top: 57px;
    left: 0;
    bottom: 0;
    width: min(88vw, 360px);
    max-width: 100%;
    border-right: 1px solid var(--border);
    border-bottom: none;
    padding: 14px;
    transform: translateX(-100%);
    transition: transform 180ms ease;
    z-index: 1100;
    box-shadow: 14px 0 32px rgba(0, 0, 0, 0.28);
  }

  body.mobile-nav-open .sidebar {
    transform: translateX(0);
  }

  .main {
    padding: 14px;
    gap: 12px;
  }

  .auth-panel,
  .workout-item {
    border-radius: 10px;
  }

  .card {
    padding: 12px;
  }

  .main-header,
  .panel-header,
  .check-row {
    align-items: flex-start;
  }

  .main-header,
  .panel-header {
    flex-direction: column;
  }

  .panel-header h1,
  .panel-header h2,
  .main-header h1 {
    width: 100%;
  }

  .main-header > div {
    width: 100%;
  }

  .row-actions,
  .actions {
    width: 100%;
    justify-content: stretch;
  }

  .row-actions > button,
  .actions > button {
    flex: 1 1 140px;
  }

  .help,
  .muted,
  .owner-note {
    line-height: 1.35;
  }

  .home-template-btn,
  .workout-item,
  .modal-card {
    width: 100%;
  }

  .toast-root {
    left: 12px;
    right: 12px;
    bottom: 12px;
  }

  .toast {
    min-width: 0;
    max-width: none;
  }
}

@media (max-width: 640px) {
  .auth-page {
    padding: 1rem;
    min-height: calc(100vh - 57px);
  }

  .auth-card {
    padding: 1.5rem;
    box-shadow: none;
    border: none;
    background: transparent;
    backdrop-filter: none;
    gap: 1.5rem;
  }
  
  .auth-card-header h1 {
    font-size: 1.5rem;
  }

  .logo {
    font-size: 22px;
  }

  .mobile-bar {
    padding: 10px 12px;
  }

  .main {
    padding: 12px;
  }

  .workout-item {
    padding: 9px;
  }

  .block,
  .exercise {
    padding: 9px;
  }

  button,
  input,
  textarea,
  select {
    font-size: 16px;
  }

  .modal-overlay {
    padding: 10px;
  }

  .modal-card {
    max-height: calc(100vh - 20px);
    overflow-y: auto;
  }

}