:root {
  color-scheme: light;
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  line-height: 1.5;
  --background: #f8fafc;
  --surface: #ffffff;
  --surface-muted: #f8fafc;
  --surface-accent: #eff6ff;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-muted: #475569;
  --brand: #0f172a;
  --personal: #38bdf8;
  --personal-soft: #e0f2fe;
  --admin: #f59e0b;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

html {
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--background);
  color: var(--text);
}

.skip-link {
  position: absolute;
  top: 1rem;
  left: 1rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: var(--brand);
  color: #ffffff;
  text-decoration: none;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  padding: 1rem max(1rem, env(safe-area-inset-left)) 1rem
    max(1rem, env(safe-area-inset-right));
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.96);
}

.header-inner {
  max-width: 64rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.85rem;
}

.brand {
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.site-header a,
.button-link {
  color: inherit;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem 1rem;
  flex-wrap: wrap;
}

.nav-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.site-main {
  max-width: 64rem;
  margin: 0 auto;
  padding: 1rem max(1rem, env(safe-area-inset-left))
    calc(2rem + env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-right));
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.125rem;
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.9rem, 9vw, 3rem);
  line-height: 1.05;
}

h2,
h3 {
  line-height: 1.2;
}

p {
  margin: 0 0 1rem;
}

code {
  padding: 0.15rem 0.35rem;
  border-radius: 0.35rem;
  background: var(--border);
}

dl,
dt,
dd {
  margin: 0;
}

form {
  margin: 0;
}

label {
  display: block;
  font-weight: 600;
}

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

input,
textarea,
select {
  width: 100%;
  box-sizing: border-box;
  min-height: 2.875rem;
  padding: 0.85rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: 0.875rem;
  background: var(--surface);
  color: inherit;
}

textarea {
  min-height: 7.5rem;
  resize: vertical;
}

button {
  min-height: 2.875rem;
}

input:focus,
textarea:focus,
select:focus,
button:focus {
  outline: 3px solid #93c5fd;
  outline-offset: 2px;
}

.stack > * + * {
  margin-top: 1rem;
}

.stack-large > * + * {
  margin-top: 1.25rem;
}

.narrow {
  max-width: 32rem;
}

.field {
  display: grid;
  gap: 0.35rem;
}

.help,
.muted {
  color: var(--text-muted);
}

.muted {
  max-width: 42rem;
}

.help {
  margin: 0;
  font-size: 0.95rem;
}

.error {
  margin: 0;
  color: #b91c1c;
  font-weight: 600;
}

.message {
  padding: 0.9rem 1rem;
  border: 1px solid #bfdbfe;
  border-radius: 0.85rem;
  background: #eff6ff;
  color: #1d4ed8;
}

.message-error {
  border-color: #fecaca;
  background: #fef2f2;
  color: #b91c1c;
}

.actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.actions > * {
  flex: 1 1 100%;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.875rem;
  padding: 0.85rem 1rem;
  border: 0;
  border-radius: 0.875rem;
  background: var(--brand);
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}

.button:hover {
  background: #1e293b;
}

.button:disabled {
  opacity: 0.65;
  cursor: default;
}

.button-secondary {
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
}

.button-secondary:hover {
  background: var(--surface-muted);
}

.button-link {
  min-height: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.button-link:hover {
  background: transparent;
  text-decoration: underline;
}

.inline-form {
  display: inline-flex;
}

.details {
  display: grid;
  gap: 0.85rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface-muted);
}

.details dt {
  margin-bottom: 0.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.details dd {
  font-size: 1.05rem;
  font-weight: 600;
}

.sheet-layout {
  display: grid;
  gap: 1rem;
}

.sheet-header {
  display: grid;
  gap: 1.25rem;
}

.sheet-header-top {
  display: grid;
  gap: 1rem;
}

.sheet-heading {
  display: grid;
  gap: 0.35rem;
}

.sheet-date {
  margin: 0;
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.sheet-header-actions {
  display: grid;
  gap: 0.75rem;
}

.sheet-nav {
  display: grid;
  gap: 0.75rem;
}

.sheet-nav .button {
  width: 100%;
}

.install-card {
  display: grid;
  gap: 0.75rem;
  padding: 1rem;
  border: 1px solid #bfdbfe;
  border-radius: 0.9rem;
  background: var(--surface-accent);
}

.install-card[hidden] {
  display: none !important;
}

.install-card .eyebrow {
  margin-bottom: 0.35rem;
  color: #1d4ed8;
}

.install-copy {
  margin: 0;
  color: #1e3a8a;
}

.install-card .button {
  width: 100%;
}

.summary-grid {
  display: grid;
  gap: 1rem;
}

.summary-card {
  display: grid;
  gap: 1rem;
}

.summary-card-top {
  display: grid;
  gap: 0.75rem;
}

.summary-card h2 {
  margin: 0;
  font-size: clamp(1.9rem, 9vw, 2.5rem);
  line-height: 1;
}

.summary-copy,
.summary-range {
  margin: 0;
  color: var(--text-muted);
}

.summary-range {
  font-size: 0.95rem;
  font-weight: 600;
}

.summary-metric {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-width: 3.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
  background: var(--personal-soft);
  color: #0369a1;
  font-size: 0.95rem;
  font-weight: 700;
}

.progress-track {
  height: 0.75rem;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}

.progress-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--personal) 0%, var(--brand) 100%);
}

.summary-stats {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.summary-stats dt {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.summary-stats dd {
  margin-top: 0.25rem;
  font-size: 1.15rem;
  font-weight: 700;
}

.sheet-grid {
  display: grid;
  gap: 1rem;
}

.session-card {
  display: grid;
  gap: 1rem;
}

.session-card-personal {
  border-top: 0.35rem solid var(--personal);
}

.session-card-admin {
  border-top: 0.35rem solid var(--admin);
}

.session-card-header {
  display: grid;
  gap: 0.75rem;
}

.session-card-header h2,
.session-section h3 {
  margin: 0;
}

.session-card-header h2 {
  margin-top: 0.2rem;
  font-size: 1.35rem;
  line-height: 1.15;
}

.session-meta {
  margin: 0;
  color: var(--text-muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

.status-badge-planned {
  background: #e2e8f0;
  color: #334155;
}

.status-badge-active {
  background: #dbeafe;
  color: #1d4ed8;
}

.status-badge-paused {
  background: #fef3c7;
  color: #92400e;
}

.status-badge-completed {
  background: #dcfce7;
  color: #166534;
}

.status-badge-skipped {
  background: #fee2e2;
  color: #b91c1c;
}

.session-summary {
  display: grid;
  gap: 1rem;
}

.session-timer {
  display: grid;
  gap: 0.75rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface-muted);
}

.session-timer-top {
  display: grid;
  gap: 1rem;
}

.session-timer h3 {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.timer-display {
  margin: 0.35rem 0 0;
  font-size: clamp(2.1rem, 14vw, 3rem);
  font-weight: 700;
  line-height: 1;
}

.timer-copy {
  margin: 0;
  color: var(--text-muted);
}

.session-timer-actions {
  display: grid;
  gap: 0.75rem;
}

.session-timer-actions .button {
  width: 100%;
}

.session-section {
  display: grid;
  gap: 0.35rem;
}

.session-section h3 {
  color: var(--text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.session-section p {
  margin: 0;
  overflow-wrap: anywhere;
}

.empty-copy {
  color: #64748b;
  font-style: italic;
}

.text-block {
  white-space: pre-wrap;
}

.session-editor {
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
}

.session-editor summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface-muted);
  cursor: pointer;
  list-style: none;
}

.session-editor summary::-webkit-details-marker {
  display: none;
}

.session-editor summary::after {
  content: "+";
  margin-top: 0.1rem;
  color: var(--text-muted);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
}

.session-editor[open] summary {
  margin-bottom: 1rem;
}

.session-editor[open] summary::after {
  content: "-";
}

.session-editor-title {
  display: block;
  font-weight: 600;
}

.session-editor-hint {
  display: block;
  margin-top: 0.15rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

@media (min-width: 641px) {
  .site-header {
    padding: 1.25rem 1.5rem;
  }

  .header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .site-main {
    padding: 1.5rem 1.5rem 3rem;
  }

  .card {
    padding: 1.5rem;
  }

  .actions > * {
    flex: 0 0 auto;
  }

  .details {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sheet-header-top {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
  }

  .sheet-header-actions {
    justify-items: end;
  }

  .sheet-nav {
    grid-auto-flow: column;
    grid-template-columns: repeat(auto-fit, minmax(0, max-content));
  }

  .sheet-nav .button {
    width: auto;
  }

  .install-card {
    justify-items: start;
    max-width: 22rem;
  }

  .install-card .button {
    width: auto;
  }

  .summary-card-top,
  .session-card-header,
  .session-timer-top {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
  }

  .summary-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .session-timer-actions {
    grid-auto-flow: column;
    grid-template-columns: repeat(auto-fit, minmax(0, max-content));
    justify-content: end;
  }

  .session-timer-actions .button {
    width: auto;
  }
}

@media (min-width: 900px) {
  .summary-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .sheet-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: no-preference) {
  .skip-link,
  .button,
  .card,
  input,
  textarea,
  select,
  .session-editor summary {
    transition:
      background-color 150ms ease,
      border-color 150ms ease,
      box-shadow 150ms ease,
      transform 150ms ease;
  }

  .button:active {
    transform: translateY(1px);
  }
}