:root {
  color-scheme: dark;
  --surface-base: #141414;
  --surface-raised: #1c1c1c;
  --surface-overlay: #222222;
  --border-default: #2a2a2a;
  --border-emphasis: #3a3a3a;
  --text-primary: #d4d4d4;
  --text-secondary: #888888;
  --text-muted: #555555;
  --accent: #6ee7ff;
  --warn: #d97757;
  --radius: 2px;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'SF Mono', ui-monospace, monospace;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --tap-target: 44px;
  --safe-top: max(16px, env(safe-area-inset-top));
  --safe-right: max(16px, env(safe-area-inset-right));
  --safe-bottom: max(16px, env(safe-area-inset-bottom));
  --safe-left: max(16px, env(safe-area-inset-left));
  --page-max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  min-height: 100dvh;
  overflow: hidden;
  background: var(--surface-base);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
}

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

button {
  border: 0;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
}

button:disabled {
  cursor: default;
  opacity: 0.45;
}

strong {
  font-weight: 600;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

[hidden] {
  display: none !important;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 0;
}

.app-shell {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.topbar,
.day-strip,
.main,
.footer-card {
  width: min(100%, var(--page-max));
  margin-inline: auto;
  padding-inline: 16px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-top: calc(var(--safe-top) + 16px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-default);
}

.title-block {
  min-width: 0;
  display: grid;
  gap: 4px;
}

.eyebrow {
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

#pageTitle {
  font-size: clamp(28px, 7vw, 44px);
  color: var(--text-primary);
}

.page-status {
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.4;
}

.top-actions {
  display: none;
}

.chip-button,
.ghost-button,
.primary-button,
.icon-button,
.day-button,
.exercise-button,
.switch-button,
.history-button,
.set-chip-remove,
.footer-link {
  transition:
    color 120ms ease-out,
    background-color 120ms ease-out,
    border-color 120ms ease-out,
    opacity 120ms ease-out;
}

.day-strip {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  padding-top: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-default);
  color: var(--text-muted);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.day-strip::-webkit-scrollbar {
  display: none;
}

.day-button {
  min-height: var(--tap-target);
  padding: 0 8px;
  display: inline-flex;
  align-items: center;
  gap: 0;
  color: var(--text-muted);
  background: transparent;
  border-radius: 0;
  font-weight: 500;
  text-transform: uppercase;
  white-space: nowrap;
}

.day-button:hover {
  color: var(--text-secondary);
}

.day-button:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 0;
}

.day-button-top {
  display: inline;
}

.day-button-title,
.day-button-sub,
.day-button-badge {
  display: none;
}

.day-button:not(:last-child):not(.is-active)::after {
  content: '·';
  margin-left: 12px;
  color: var(--text-muted);
}

.day-button.is-active {
  color: var(--accent);
  margin-right: 12px;
}

.day-button.is-active::before {
  content: '[';
  margin-right: 4px;
  color: var(--accent);
}

.day-button.is-active::after {
  content: ']';
  margin-left: 4px;
  color: var(--accent);
}

.day-button.is-today:not(.is-active) {
  color: var(--text-secondary);
  text-decoration: underline;
  text-decoration-color: var(--border-emphasis);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.main {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding-top: 16px;
  padding-bottom: 24px;
  scrollbar-width: none;
}

.main::-webkit-scrollbar {
  display: none;
}

.day-view {
  display: grid;
  gap: 16px;
  counter-reset: exercise;
}

.day-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-default);
}

.day-kicker {
  margin-bottom: 4px;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.day-title {
  font-size: clamp(24px, 6vw, 36px);
  color: var(--text-primary);
}

.day-summary {
  margin-top: 8px;
  max-width: 48ch;
  color: var(--text-secondary);
  font-size: 14px;
}

.day-meta {
  min-width: 88px;
  display: grid;
  justify-items: end;
  gap: 4px;
  text-align: right;
}

.day-meta-number {
  color: var(--text-secondary);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}

.day-meta-label {
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.stack {
  display: grid;
  gap: 12px;
}

.stack:has(.exercise-card) {
  gap: 0;
}

.alert-card,
.info-card,
.checklist-card,
.history-session,
.reference-banner {
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  background: var(--surface-raised);
}

.alert-card {
  padding: 12px 16px 16px;
  border-left: 3px solid var(--border-emphasis);
}

.alert-card.is-good,
.alert-card.is-danger {
  border-left-color: var(--warn);
}

.alert-card.is-muted,
.alert-card.is-neutral {
  border-left-color: var(--border-default);
}

.alert-title {
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.alert-card.is-good .alert-title::before,
.alert-card.is-danger .alert-title::before {
  content: '⚠ KNEE-SAFE';
  display: block;
  margin-bottom: 4px;
  color: var(--warn);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
}

.alert-body {
  margin-top: 8px;
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
}

.alert-card.is-muted .alert-body,
.alert-card.is-neutral .alert-body {
  color: var(--text-secondary);
}

.toggle-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-default);
}

.toggle-copy {
  min-width: 0;
}

.toggle-copy strong {
  display: block;
  font-size: 13px;
}

.toggle-copy span {
  display: block;
  margin-top: 4px;
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.4;
}

.switch-button {
  min-width: 84px;
  min-height: var(--tap-target);
  padding: 0 12px;
  border: 1px solid var(--border-emphasis);
  border-radius: var(--radius);
  background: var(--surface-overlay);
  color: var(--text-secondary);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.switch-button:hover {
  background: var(--surface-raised);
  border-color: var(--border-default);
  color: var(--text-primary);
}

.switch-button.is-on {
  border-color: var(--accent);
  color: var(--accent);
}

.info-card {
  padding: 16px;
  color: var(--text-secondary);
}

.info-card p {
  font-size: 14px;
  line-height: 1.5;
}

.checklist-card {
  padding: 16px;
}

.checklist-card h3 {
  margin-bottom: 12px;
  font-size: 16px;
  color: var(--text-primary);
}

.checklist-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  background: var(--surface-overlay);
}

.checklist-bullet {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border: 1px solid var(--accent);
  border-radius: 0;
  background: transparent;
}

.checklist-item span:last-child {
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
}

.exercise-card {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 12px;
  padding-top: 16px;
  padding-bottom: 16px;
  border-top: 1px solid var(--border-default);
}

.exercise-card:last-child {
  border-bottom: 1px solid var(--border-default);
}

.exercise-card::before {
  counter-increment: exercise;
  content: counter(exercise, decimal-leading-zero);
  grid-column: 1;
  grid-row: 1 / -1;
  align-self: start;
  color: var(--text-secondary);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  padding-top: 2px;
}

.exercise-card > * {
  grid-column: 2;
  min-width: 0;
}

.exercise-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.exercise-name {
  color: var(--text-primary);
  font-size: 16px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.exercise-prescription {
  margin-top: 4px;
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

.exercise-prescription strong {
  color: var(--text-primary);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.exercise-note {
  margin-top: 4px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.4;
}

.exercise-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.exercise-head-actions {
  justify-content: flex-end;
}

.exercise-button,
.history-button,
.chip-button,
.ghost-button,
.primary-button,
.icon-button {
  min-height: var(--tap-target);
  padding: 0 12px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  background: var(--surface-raised);
  color: var(--text-primary);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.exercise-button:hover,
.history-button:hover,
.chip-button:hover,
.ghost-button:hover,
.primary-button:hover,
.icon-button:hover {
  background: var(--surface-overlay);
  border-color: var(--border-emphasis);
}

.exercise-button.is-primary {
  border-color: var(--accent);
  color: var(--accent);
}

.exercise-button.is-complete {
  border-color: var(--accent);
  color: var(--accent);
}

.history-button {
  color: var(--text-secondary);
}

.history-button:hover {
  color: var(--text-primary);
}

.hint-line {
  padding: 12px 16px;
  border: 1px solid var(--border-default);
  border-left: 3px solid var(--border-emphasis);
  border-radius: var(--radius);
  background: var(--surface-raised);
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

.hint-line strong {
  color: var(--text-primary);
  font-weight: 500;
}

.current-session {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-default);
}

.current-session-label,
.history-label {
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.session-status {
  color: var(--text-secondary);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.set-chip-row,
.history-set-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.set-chip,
.history-set {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: var(--tap-target);
  padding: 0 12px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  background: var(--surface-overlay);
  color: var(--text-primary);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.history-set {
  background: var(--surface-raised);
  color: var(--text-secondary);
}

.set-chip-remove {
  width: 44px;
  min-width: 44px;
  height: 44px;
  margin: 0 -12px 0 0;
  border-left: 1px solid var(--border-default);
  border-radius: 0;
  background: transparent;
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1;
}

.set-chip-remove:hover {
  color: var(--text-primary);
}

.history-panel {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-default);
}

.history-session {
  padding: 12px;
}

.history-session-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.history-session-title {
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.history-session-meta {
  margin-top: 4px;
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.4;
}

.history-empty {
  padding: 12px;
  border: 1px dashed var(--border-default);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

.reference-banner {
  padding: 12px 16px;
  color: var(--text-secondary);
  border-left: 3px solid var(--border-default);
}

.footer-card {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-top: 16px;
  padding-bottom: calc(var(--safe-bottom) + 16px);
  border-top: 1px solid var(--border-default);
}

.footer-copy {
  min-width: 0;
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.5;
}

.footer-label {
  margin-right: 4px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.footer-link {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: none;
}

.footer-link:hover {
  color: var(--text-primary);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: end center;
  padding: 16px;
  background: rgba(0, 0, 0, 0.72);
}

.modal[hidden] {
  display: none;
}

.modal-card {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: calc(100dvh - 32px);
  overflow: auto;
  padding: 16px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  background: var(--surface-overlay);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  background: var(--surface-raised);
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1;
}

.modal-close:hover {
  background: var(--surface-raised);
  border-color: var(--border-emphasis);
  color: var(--text-primary);
}

.modal-kicker {
  margin: 0 52px 8px 0;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.modal-card h2 {
  margin: 0;
  font-size: 24px;
  color: var(--text-primary);
}

.modal-hint {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

.log-form {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.field input {
  width: 100%;
  min-height: 64px;
  padding: 16px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  background: var(--surface-raised);
  color: var(--text-primary);
  font-size: 28px;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.field input::placeholder {
  color: var(--text-muted);
}

.field input:focus-visible {
  border-color: var(--accent);
}

.modal-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.ghost-button {
  color: var(--text-secondary);
  background: transparent;
}

.ghost-button:hover {
  color: var(--text-primary);
}

.primary-button {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--surface-raised);
}

.primary-button:hover {
  background: var(--surface-overlay);
}

.icon-button {
  padding: 0;
}

.icon-button:hover {
  color: var(--text-primary);
}

@media (max-width: 719px) {
  .topbar,
  .day-strip,
  .main,
  .footer-card {
    padding-inline: 16px;
  }

  .day-hero {
    grid-template-columns: 1fr;
  }

  .day-meta {
    justify-items: start;
    text-align: left;
  }

  .exercise-head {
    flex-direction: column;
  }

  .exercise-head-actions {
    justify-content: flex-start;
  }

  .footer-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-link {
    margin-top: 4px;
  }

  .modal {
    place-items: end center;
  }
}

@media (min-width: 720px) {
  .modal {
    place-items: center;
  }
}