/*
 * app-theme.css — shared theme for the ClassroomIO mobile-app prototypes.
 *
 * Tokens mirror packages/ui/src/index.css (shadcn-svelte) exactly: OKLCH
 * palette, Geist, --radius: 0.625rem, and the Button / Badge / Item / Progress
 * recipes from @cio/ui. Dark mode uses the same `.dark` class as the app.
 *
 * On top of those tokens this file adds the mobile shell primitives the
 * dashboard has no equivalent for: a 390x844 device frame, status bar,
 * nav bar, bottom tab bar, list rows, bottom sheets, banners and toasts.
 *
 * Semantic colour follows @cio/ui, not filled surfaces:
 *   Badge  — rounded-full, 10% tint + coloured text (learners-table)
 *   Alert  — destructive is card + red text; warning/info use amber-50 / sky-50
 *   Rows   — default card; status lives on a chip, never a painted row
 */

:root {
  --background: oklch(1 0 0);
  --foreground: oklch(0.145 0 0);
  --card: oklch(1 0 0);
  --card-foreground: oklch(0.145 0 0);
  --popover: oklch(1 0 0);
  --popover-foreground: oklch(0.145 0 0);
  --primary: oklch(0.488 0.243 264.376);
  --primary-foreground: oklch(0.97 0.014 254.604);
  --secondary: oklch(0.967 0.001 286.375);
  --secondary-foreground: oklch(0.21 0.006 285.885);
  --muted: oklch(0.97 0 0);
  --muted-foreground: oklch(0.556 0 0);
  --accent: oklch(0.97 0 0);
  --accent-foreground: oklch(0.205 0 0);
  --destructive: oklch(0.577 0.245 27.325);
  --destructive-soft: oklch(0.577 0.245 27.325 / 0.1);
  --border: oklch(0.922 0 0);
  --input: oklch(0.922 0 0);
  --ring: oklch(0.708 0 0);
  --radius: 0.625rem;

  /* Semantic states from @cio/ui Badge variants (emerald / amber), 10% tints */
  --success: oklch(0.596 0.145 163.225);
  --success-foreground: #fff;
  --success-soft: oklch(0.596 0.145 163.225 / 0.1);
  --warning: oklch(0.666 0.179 58.318);
  --warning-foreground: #fff;
  --warning-soft: oklch(0.666 0.179 58.318 / 0.1);

  /* Alert.warning / Alert.information surfaces from @cio/ui base/alert */
  --alert-warning-bg: oklch(0.987 0.022 95.277);
  --alert-warning-border: oklch(0.924 0.12 95.746);
  --alert-warning-fg: oklch(0.414 0.112 45.904);
  --alert-info-bg: oklch(0.977 0.013 236.62);
  --alert-info-border: oklch(0.901 0.058 230.902);
  --alert-info-fg: oklch(0.391 0.09 240.876);

  --radius-sm: calc(var(--radius) - 4px);
  --radius-md: calc(var(--radius) - 2px);
  --radius-lg: var(--radius);
  --radius-xl: calc(var(--radius) + 4px);

  --shadow-2xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  /* device chrome */
  --device-bezel: oklch(0.205 0 0);
  --page-bg: oklch(0.97 0 0);
}

.dark {
  --background: oklch(0.145 0 0);
  --foreground: oklch(0.985 0 0);
  --card: oklch(0.205 0 0);
  --card-foreground: oklch(0.985 0 0);
  --popover: oklch(0.205 0 0);
  --popover-foreground: oklch(0.985 0 0);
  --primary: oklch(0.424 0.199 265.638);
  --primary-foreground: oklch(0.97 0.014 254.604);
  --secondary: oklch(0.274 0.006 286.033);
  --secondary-foreground: oklch(0.985 0 0);
  --muted: oklch(0.269 0 0);
  --muted-foreground: oklch(0.708 0 0);
  --accent: oklch(0.269 0 0);
  --accent-foreground: oklch(0.985 0 0);
  --destructive: oklch(0.704 0.191 22.216);
  --destructive-soft: oklch(0.704 0.191 22.216 / 0.12);
  --border: oklch(1 0 0 / 10%);
  --input: oklch(1 0 0 / 15%);
  --ring: oklch(0.556 0 0);

  --success: oklch(0.696 0.17 162.48);
  --success-foreground: oklch(0.262 0.051 172.552);
  --success-soft: oklch(0.696 0.17 162.48 / 0.12);
  --warning: oklch(0.769 0.188 70.08);
  --warning-foreground: oklch(0.279 0.077 45.635);
  --warning-soft: oklch(0.769 0.188 70.08 / 0.12);

  --alert-warning-bg: oklch(0.279 0.077 45.635);
  --alert-warning-border: oklch(0.414 0.112 45.904);
  --alert-warning-fg: oklch(0.987 0.022 95.277);
  --alert-info-bg: oklch(0.293 0.066 243.157);
  --alert-info-border: oklch(0.391 0.09 240.876);
  --alert-info-fg: oklch(0.977 0.013 236.62);

  --device-bezel: oklch(0.269 0 0);
  --page-bg: oklch(0.115 0 0);
}

/* ============ base ============ */
* {
  box-sizing: border-box;
  border-color: var(--border);
}
html,
body {
  margin: 0;
  padding: 0;
}
body {
  font-family:
    'Geist',
    ui-sans-serif,
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    sans-serif;
  background: var(--page-bg);
  color: var(--foreground);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
}
svg {
  flex-shrink: 0;
}
.tnum {
  font-variant-numeric: tabular-nums;
}
.text-muted {
  color: var(--muted-foreground);
}
.text-primary {
  color: var(--primary);
}
.text-success {
  color: var(--success);
}
.text-warning {
  color: var(--warning);
}
.text-danger {
  color: var(--destructive);
}

/* ============ prototype page chrome (outside the device) ============ */
.proto-head {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px 8px;
}
.proto-head .back {
  font-size: 13px;
  color: var(--muted-foreground);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
}
.proto-head .back:hover {
  color: var(--foreground);
}
.proto-head .eyebrow {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
}
.proto-head h1 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 6px 0 8px;
}
.proto-head p {
  color: var(--muted-foreground);
  font-size: 14.5px;
  max-width: 76ch;
  margin: 0 0 6px;
  line-height: 1.6;
}
.proto-head code {
  background: var(--muted);
  color: var(--foreground);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12.5px;
}
.proto-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.proto-links a {
  font-size: 12.5px;
  font-weight: 500;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted-foreground);
}
.proto-links a:hover {
  color: var(--foreground);
  border-color: var(--ring);
}

.stage {
  max-width: 1280px;
  margin: 0 auto;
  padding: 26px 24px 80px;
  display: flex;
  flex-wrap: wrap;
  gap: 34px;
  align-items: flex-start;
}
.device {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.device figcaption {
  max-width: 390px;
  text-align: center;
  font-size: 12.5px;
  color: var(--muted-foreground);
  line-height: 1.55;
}
.device figcaption b {
  display: block;
  color: var(--foreground);
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 2px;
}

/* ============ device frame ============ */
.phone {
  width: 390px;
  height: 844px;
  border-radius: 46px;
  background: var(--device-bezel);
  padding: 11px;
  box-shadow: var(--shadow-lg);
  flex-shrink: 0;
}
.phone-inner {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 36px;
  overflow: hidden;
  background: var(--background);
  color: var(--foreground);
  display: flex;
  flex-direction: column;
}

/* status bar */
.statusbar {
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 26px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
  position: relative;
  z-index: 5;
  background: var(--background);
}
.statusbar .icons {
  display: flex;
  align-items: center;
  gap: 5px;
}
.statusbar svg {
  width: 15px;
  height: 15px;
  stroke-width: 2.2;
}
.notch {
  position: absolute;
  top: 9px;
  left: 50%;
  transform: translateX(-50%);
  width: 112px;
  height: 27px;
  border-radius: 999px;
  background: var(--device-bezel);
  z-index: 6;
}

/* nav bar (in-app header) */
.navbar {
  flex-shrink: 0;
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 16px 10px;
  background: var(--background);
  position: relative;
  z-index: 4;
}
.navbar.bordered {
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}
.navbar .title {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.navbar .title-sm {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.navbar .sub {
  font-size: 11.5px;
  color: var(--muted-foreground);
}
.navbar .spacer {
  margin-left: auto;
}
.navbar .actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* screen scroll area */
.screen {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0 16px 24px;
  scrollbar-width: none;
}
.screen::-webkit-scrollbar {
  display: none;
}
.screen.flush {
  padding-left: 0;
  padding-right: 0;
}
.screen.centered {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-bottom: 40px;
}

/* bottom tab bar */
.tabbar {
  flex-shrink: 0;
  height: 78px;
  padding: 8px 6px 22px;
  border-top: 1px solid var(--border);
  background: color-mix(in oklab, var(--background) 92%, transparent);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: flex-start;
  justify-content: space-around;
}
.tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--muted-foreground);
  font-size: 10.5px;
  font-weight: 500;
  padding-top: 4px;
  position: relative;
}
.tab svg {
  width: 22px;
  height: 22px;
  stroke-width: 1.9;
}
.tab.on {
  color: var(--primary);
}
.tab.on svg {
  stroke-width: 2.3;
}
.tab .dot {
  position: absolute;
  top: 2px;
  right: 50%;
  margin-right: -16px;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--primary);
  border: 2px solid var(--background);
}
.tab .count {
  position: absolute;
  top: 0;
  right: 50%;
  margin-right: -22px;
  min-width: 17px;
  height: 17px;
  padding: 0 4px;
  border-radius: 999px;
  background: var(--primary);
  color: var(--primary-foreground);
  font-size: 10px;
  font-weight: 700;
  display: grid;
  place-items: center;
  border: 2px solid var(--background);
}

/* home indicator */
.home-bar {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 134px;
  height: 5px;
  border-radius: 999px;
  background: var(--foreground);
  opacity: 0.28;
  z-index: 7;
  pointer-events: none;
}

/* ============ typography inside the app ============ */
.h-screen-title {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 2px 0 2px;
}
.sec-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 22px 0 10px;
}
.sec-head:first-child {
  margin-top: 10px;
}
.sec-head h2 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 0;
}
.sec-head .count {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted-foreground);
  background: var(--muted);
  padding: 1px 7px;
  border-radius: 999px;
}
.sec-head .more {
  margin-left: auto;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--primary);
}
.eyebrow {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted-foreground);
}

/* ============ buttons (mirrors @cio/ui base/button) ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  height: 38px;
  padding: 0 16px;
  border: 1px solid transparent;
  cursor: pointer;
  box-shadow: var(--shadow-2xs);
  user-select: none;
  transition:
    background 0.12s,
    border-color 0.12s,
    color 0.12s;
}
.btn svg {
  width: 16px;
  height: 16px;
  stroke-width: 2;
}
.btn-primary {
  background: var(--primary);
  color: var(--primary-foreground);
}
.btn-outline {
  background: var(--background);
  border-color: var(--input);
  color: var(--foreground);
}
.btn-secondary {
  background: var(--secondary);
  color: var(--secondary-foreground);
}
.btn-ghost {
  background: transparent;
  box-shadow: none;
  color: var(--foreground);
}
.btn-destructive {
  background: var(--destructive);
  color: #fff;
}
.btn-success {
  background: var(--success);
  color: var(--success-foreground);
}
.btn-block {
  width: 100%;
}
.btn-lg {
  height: 46px;
  font-size: 15px;
  border-radius: var(--radius-lg);
}
.btn-sm {
  height: 32px;
  padding: 0 11px;
  font-size: 12.5px;
  gap: 6px;
}
.btn-sm svg {
  width: 14px;
  height: 14px;
}
.btn[disabled],
.btn.disabled {
  opacity: 0.45;
  pointer-events: none;
}

/* icon button — @cio/ui rule: icon-only buttons use the secondary variant */
.icon-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--secondary);
  color: var(--secondary-foreground);
  display: grid;
  place-items: center;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
}
.icon-btn svg {
  width: 17px;
  height: 17px;
  stroke-width: 2;
}
.icon-btn.plain {
  background: transparent;
  color: var(--foreground);
}
.icon-btn .ping {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--primary);
  border: 2px solid var(--background);
}

/* ============ badges (mirrors dashboard usage of @cio/ui Badge) ============
 * Filled success/warning/destructive exist in the component, but screens use
 * the 10% tint + coloured-text recipe from the compliance learners table.
 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  width: fit-content;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 2px 8px;
  font-size: 11.5px;
  font-weight: 500;
  white-space: nowrap;
}
.badge svg {
  width: 11px;
  height: 11px;
  stroke-width: 2.4;
}
.badge-default {
  background: var(--primary);
  color: var(--primary-foreground);
}
.badge-secondary {
  background: var(--secondary);
  color: var(--secondary-foreground);
}
.badge-outline {
  border-color: var(--border);
  color: var(--muted-foreground);
}
.badge-success,
.badge-success-soft {
  background: var(--success-soft);
  color: var(--success);
}
.badge-warning,
.badge-warning-soft {
  background: var(--warning-soft);
  color: var(--warning);
}
.badge-danger,
.badge-danger-soft {
  background: var(--destructive-soft);
  color: var(--destructive);
}
.badge-primary-soft {
  background: color-mix(in oklab, var(--primary) 10%, transparent);
  color: var(--primary);
}
.badge-muted {
  background: var(--muted);
  color: var(--muted-foreground);
}

/* ============ cards & rows ============ */
.card {
  background: var(--card);
  color: var(--card-foreground);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xs);
}
.card-pad {
  padding: 14px;
}
.stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.stack-sm {
  gap: 6px;
}
.row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.row-top {
  align-items: flex-start;
}
.between {
  justify-content: space-between;
}
.grow {
  flex: 1;
  min-width: 0;
}

/* list row (mirrors @cio/ui base/item, tuned for touch) */
.lrow {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-lg);
  background: var(--card);
  border: 1px solid var(--border);
  min-height: 56px;
}
.lrow.flat {
  border: none;
  background: transparent;
  padding: 11px 0;
  border-radius: 0;
  border-bottom: 1px solid var(--border);
}
.lrow.flat:last-child {
  border-bottom: none;
}
.lrow.done .ltitle {
  color: var(--muted-foreground);
}
.lrow.locked {
  opacity: 0.62;
}
.lrow.current {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--primary) 10%, transparent);
}
.ltitle {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.35;
}
.lsub {
  font-size: 12px;
  color: var(--muted-foreground);
  line-height: 1.45;
  margin-top: 2px;
}
.lmeta {
  font-size: 11.5px;
  color: var(--muted-foreground);
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 4px;
  flex-wrap: wrap;
}
.lmeta svg {
  width: 12px;
  height: 12px;
  stroke-width: 2;
}
.lmeta .sep {
  opacity: 0.5;
}

/* leading media */
.media {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--muted);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  color: var(--muted-foreground);
  flex-shrink: 0;
}
.media svg {
  width: 17px;
  height: 17px;
  stroke-width: 2;
}
.media.is-done {
  background: var(--success-soft);
  border-color: transparent;
  color: var(--success);
}
.media.is-current {
  background: color-mix(in oklab, var(--primary) 10%, transparent);
  border-color: transparent;
  color: var(--primary);
}
.media.is-danger {
  background: var(--destructive-soft);
  border-color: transparent;
  color: var(--destructive);
}
.media.is-warning {
  background: var(--warning-soft);
  border-color: transparent;
  color: var(--warning);
}
.media.lg {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-lg);
}
.media.sq {
  width: 56px;
  height: 42px;
}
.thumb {
  width: 78px;
  height: 56px;
  border-radius: var(--radius-md);
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  color: #fff;
}
.thumb svg {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  opacity: 0.95;
}
.avatar {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: var(--secondary);
  color: var(--secondary-foreground);
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: 12.5px;
  flex-shrink: 0;
}
.avatar.sm {
  width: 26px;
  height: 26px;
  font-size: 10.5px;
}
.avatar.lg {
  width: 56px;
  height: 56px;
  font-size: 19px;
}
.avatar.brand {
  background: var(--primary);
  color: var(--primary-foreground);
  border-radius: var(--radius-md);
}
.chev {
  color: var(--muted-foreground);
  flex-shrink: 0;
}
.chev svg {
  width: 17px;
  height: 17px;
  stroke-width: 2;
  display: block;
}

/* ============ progress ============ */
.progress {
  height: 6px;
  border-radius: 999px;
  overflow: hidden;
  background: color-mix(in oklab, var(--primary) 18%, transparent);
  flex: 1;
}
.progress > span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--primary);
}
.progress.success > span {
  background: var(--primary);
}
.progress.warning > span {
  background: var(--primary);
}
.progress.danger > span {
  background: var(--primary);
}
.progress.tall {
  height: 8px;
}

.ring {
  position: relative;
  width: 42px;
  height: 42px;
  flex-shrink: 0;
}
.ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
  display: block;
}
.ring .track {
  stroke: var(--border);
}
.ring .arc {
  stroke: var(--primary);
}
.ring .arc.primary {
  stroke: var(--primary);
}
.ring .arc.warning {
  stroke: var(--warning);
}
.ring .lbl {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 10.5px;
  font-weight: 600;
}
.ring.lg {
  width: 78px;
  height: 78px;
}
.ring.lg .lbl {
  font-size: 17px;
  letter-spacing: -0.02em;
}

/* segment bar (multi-step progress) */
.segs {
  display: flex;
  gap: 3px;
  flex: 1;
}
.seg {
  flex: 1;
  height: 5px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--primary) 15%, transparent);
}
.seg.done {
  background: var(--primary);
}
.seg.now {
  background: var(--primary);
}

/* ============ banners, alerts, callouts — @cio/ui base/alert ============ */
.banner {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 13px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.45;
  background: var(--card);
  color: var(--card-foreground);
}
.banner svg {
  width: 17px;
  height: 17px;
  stroke-width: 2.1;
  margin-top: 1px;
}
.banner .bt {
  font-weight: 600;
  font-size: 13.5px;
  letter-spacing: -0.01em;
}
.banner .bd {
  font-size: 12.5px;
  color: var(--muted-foreground);
  margin-top: 2px;
}
.banner-danger {
  color: var(--destructive);
}
.banner-danger .bd {
  color: color-mix(in oklab, var(--destructive) 80%, transparent);
}
.banner-warning {
  background: var(--alert-warning-bg);
  border-color: var(--alert-warning-border);
  color: var(--alert-warning-fg);
}
.banner-warning .bd {
  color: var(--alert-warning-fg);
  opacity: 0.82;
}
.banner-success {
  background: var(--card);
  border-color: var(--border);
  color: var(--card-foreground);
}
.banner-info {
  background: var(--alert-info-bg);
  border-color: var(--alert-info-border);
  color: var(--alert-info-fg);
}
.banner-info .bd {
  color: var(--alert-info-fg);
  opacity: 0.82;
}
.banner-muted {
  background: var(--muted);
  border-color: var(--border);
  color: var(--muted-foreground);
}
.banner-muted .bd {
  color: var(--muted-foreground);
}

/* thin app-wide offline strip — muted, not a filled amber bar */
.offline-strip {
  flex-shrink: 0;
  background: var(--muted);
  color: var(--muted-foreground);
  font-size: 11.5px;
  font-weight: 500;
  padding: 5px 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
  border-bottom: 1px solid var(--border);
}
.offline-strip svg {
  width: 13px;
  height: 13px;
  stroke-width: 2.4;
}

/* ============ segmented control & chips ============ */
.segmented {
  display: flex;
  padding: 3px;
  background: var(--muted);
  border-radius: var(--radius-lg);
  gap: 2px;
}
.segmented button,
.segmented a {
  flex: 1;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  padding: 6px 8px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--muted-foreground);
  cursor: pointer;
  text-align: center;
}
.segmented .on {
  background: var(--background);
  color: var(--foreground);
  box-shadow: var(--shadow-2xs);
}

.chips {
  display: flex;
  gap: 7px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 2px;
}
.chips::-webkit-scrollbar {
  display: none;
}
.chip {
  flex-shrink: 0;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--muted-foreground);
  cursor: pointer;
}
.chip.on {
  background: var(--foreground);
  color: var(--background);
  border-color: var(--foreground);
}

/* in-screen tabs */
.tabs {
  display: flex;
  gap: 16px;
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
  overflow-x: auto;
  scrollbar-width: none;
  flex-shrink: 0;
  background: var(--background);
}
.tabs::-webkit-scrollbar {
  display: none;
}
.tabs a,
.tabs button {
  border: none;
  background: none;
  padding: 9px 0 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted-foreground);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  cursor: pointer;
}
.tabs .on {
  color: var(--foreground);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

/* ============ forms ============ */
.input,
.textarea,
.select {
  width: 100%;
  font: inherit;
  font-size: 14.5px;
  color: var(--foreground);
  background: var(--background);
  border: 1px solid var(--input);
  border-radius: var(--radius-md);
  padding: 11px 12px;
  outline: none;
  box-shadow: var(--shadow-2xs);
}
.input::placeholder,
.textarea::placeholder {
  color: var(--muted-foreground);
}
.textarea {
  resize: none;
  min-height: 76px;
  line-height: 1.5;
}
.label {
  display: block;
  font-size: 12.5px;
  font-weight: 500;
  margin-bottom: 6px;
}
.field {
  margin-bottom: 14px;
}
.hint {
  font-size: 11.5px;
  color: var(--muted-foreground);
  margin-top: 5px;
  line-height: 1.45;
}
.search {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--muted);
  border-radius: var(--radius-lg);
  padding: 9px 12px;
  color: var(--muted-foreground);
  font-size: 14px;
}
.search svg {
  width: 16px;
  height: 16px;
  stroke-width: 2;
}

/* iOS-style switch */
.switch {
  position: relative;
  width: 44px;
  height: 26px;
  flex-shrink: 0;
  display: inline-block;
  cursor: pointer;
}
.switch input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
  z-index: 1;
}
.switch .track {
  position: absolute;
  inset: 0;
  background: var(--input);
  border-radius: 999px;
  transition: background 0.16s ease-out;
}
.switch .knob {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.16s ease-out;
}
.switch input:checked + .track {
  background: var(--primary);
}
.switch input:checked ~ .knob {
  transform: translateX(18px);
}

/* radio / checkbox rows for exercises */
.opt {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 13px 14px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--card);
  font-size: 14px;
  cursor: pointer;
}
.opt .mark {
  width: 21px;
  height: 21px;
  border-radius: 999px;
  border: 2px solid var(--border);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: transparent;
}
.opt .mark svg {
  width: 12px;
  height: 12px;
  stroke-width: 3;
}
.opt.box .mark {
  border-radius: var(--radius-sm);
}
.opt.on {
  border-color: var(--primary);
  background: color-mix(in oklab, var(--primary) 7%, transparent);
}
.opt.on .mark {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-foreground);
}
.opt.correct {
  border-color: var(--border);
  background: var(--success-soft);
}
.opt.correct .mark {
  background: var(--success);
  border-color: var(--success);
  color: var(--success-foreground);
}
.opt.wrong {
  border-color: var(--border);
  background: var(--destructive-soft);
}
.opt.wrong .mark {
  background: var(--destructive);
  border-color: var(--destructive);
  color: #fff;
}

/* ============ bottom sheet ============ */
.sheet {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--popover);
  border-radius: 22px 22px 0 0;
  border-top: 1px solid var(--border);
  box-shadow: 0 -12px 32px rgb(0 0 0 / 0.18);
  z-index: 8;
  padding: 10px 16px 30px;
  max-height: 74%;
  display: flex;
  flex-direction: column;
}
.sheet .grabber {
  width: 38px;
  height: 4px;
  border-radius: 999px;
  background: var(--border);
  margin: 2px auto 12px;
  flex-shrink: 0;
}
.sheet .sheet-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  flex-shrink: 0;
}
.sheet .sheet-head .st {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.sheet .sheet-body {
  overflow-y: auto;
  scrollbar-width: none;
}
.sheet .sheet-body::-webkit-scrollbar {
  display: none;
}
.scrim {
  position: absolute;
  inset: 0;
  background: oklch(0.145 0 0 / 0.42);
  z-index: 7;
}

/* toast / push preview */
.push {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  z-index: 9;
  background: color-mix(in oklab, var(--popover) 88%, transparent);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 11px 13px;
  box-shadow: var(--shadow-lg);
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.push .pi {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--primary);
  color: var(--primary-foreground);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}
.push .pt {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.push .pb {
  font-size: 12.5px;
  color: var(--muted-foreground);
  line-height: 1.4;
  margin-top: 1px;
}
.push .pw {
  font-size: 11px;
  color: var(--muted-foreground);
  margin-left: auto;
  flex-shrink: 0;
}

/* ============ player ============ */
.player {
  position: relative;
  margin: 0 -16px;
  aspect-ratio: 16 / 9;
  background: oklch(0.145 0 0);
  display: grid;
  place-items: center;
  overflow: hidden;
}
.player .play {
  width: 58px;
  height: 58px;
  border-radius: 999px;
  background: rgb(255 255 255 / 0.16);
  backdrop-filter: blur(6px);
  border: 1.5px solid rgb(255 255 255 / 0.5);
  display: grid;
  place-items: center;
  color: #fff;
}
.player .play svg {
  width: 24px;
  height: 24px;
  margin-left: 3px;
}
.player .ctrl {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 20px 14px 10px;
  background: linear-gradient(transparent, rgb(0 0 0 / 0.72));
  color: #fff;
}
.player .ctrl .bar {
  height: 3px;
  border-radius: 999px;
  background: rgb(255 255 255 / 0.3);
  margin-bottom: 7px;
}
.player .ctrl .bar > span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: #fff;
}
.player .ctrl .meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}
.player .ctrl .meta svg {
  width: 16px;
  height: 16px;
  stroke-width: 2;
}
.player .ctrl .meta .right {
  margin-left: auto;
  display: flex;
  gap: 13px;
  align-items: center;
}
.player .pill {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgb(0 0 0 / 0.6);
  color: #fff;
  font-size: 10.5px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.player .pill svg {
  width: 11px;
  height: 11px;
  stroke-width: 2.4;
}

/* lesson prose */
.prose {
  font-size: 14.5px;
  line-height: 1.62;
  color: var(--foreground);
}
.prose p {
  margin: 0 0 12px;
}
.prose h3 {
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 18px 0 8px;
}
.prose ul {
  margin: 0 0 12px;
  padding-left: 20px;
}
.prose li {
  margin-bottom: 6px;
}
.prose strong {
  font-weight: 600;
}

/* ============ empty state ============ */
.empty {
  text-align: center;
  padding: 40px 22px;
}
.empty .ei {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-xl);
  background: var(--muted);
  color: var(--muted-foreground);
  display: grid;
  place-items: center;
  margin: 0 auto 14px;
}
.empty .ei svg {
  width: 23px;
  height: 23px;
  stroke-width: 1.8;
}
.empty .et {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.empty .ed {
  font-size: 13px;
  color: var(--muted-foreground);
  margin-top: 5px;
  line-height: 1.5;
}

/* ============ misc ============ */
.divider {
  height: 1px;
  background: var(--border);
  margin: 14px 0;
}
.kv {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13.5px;
}
.kv:last-child {
  border-bottom: none;
}
.kv .k {
  color: var(--muted-foreground);
}
.kv .v {
  font-weight: 500;
}
.stat {
  flex: 1;
  text-align: center;
  padding: 11px 6px;
}
.stat .v {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.stat .k {
  font-size: 10.5px;
  color: var(--muted-foreground);
  margin-top: 1px;
}
.dl-dot {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--primary) 10%, transparent);
  color: var(--primary);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.dl-dot svg {
  width: 10px;
  height: 10px;
  stroke-width: 3.4;
}

/* theme toggle floating on the prototype page */
.theme-toggle {
  position: fixed;
  bottom: 18px;
  right: 18px;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted-foreground);
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  z-index: 50;
}
.theme-toggle svg {
  width: 17px;
  height: 17px;
  stroke-width: 2;
}
.theme-toggle:hover {
  color: var(--foreground);
}

@media (max-width: 900px) {
  .stage {
    justify-content: center;
  }
}