@font-face {
  font-family: "Nunito";
  src: url("/static/fonts/Nunito-VariableFont_wght.ttf") format("truetype");
  font-style: normal;
  font-weight: 200 1000;
  font-display: swap;
}

@font-face {
  font-family: "Nunito";
  src: url("/static/fonts/Nunito-Italic-VariableFont_wght.ttf") format("truetype");
  font-style: italic;
  font-weight: 200 1000;
  font-display: swap;
}

:root {
  --site-header-height: 64px;
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-soft: #fafafd;
  --surface-muted: #f2f2f7;
  --line: #e3e4eb;
  --line-strong: #d6d8e2;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #ef97b0;
  --accent-strong: #e97fa0;
  --accent-soft: rgba(239, 151, 176, 0.14);
  --danger: #d8566f;
  --danger-soft: rgba(216, 86, 111, 0.1);
  --success: #2e9c6a;
  --success-soft: rgba(46, 156, 106, 0.12);
  --shadow-xs: 0 1px 2px rgba(16, 24, 40, 0.03);
  --shadow-sm: 0 6px 20px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 14px 34px rgba(16, 24, 40, 0.08);
  --radius-card: 20px;
  --radius-control: 14px;
  --radius-chip: 12px;
  --control-height: 44px;
  --chip-height: 30px;
  --focus-ring: 0 0 0 4px rgba(239, 151, 176, 0.18);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.45;
}

::selection {
  background: rgba(239, 151, 176, 0.25);
  color: var(--text);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.48);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(246, 247, 252, 0.5)),
    radial-gradient(120% 140% at 0% 0%, rgba(239, 151, 176, 0.08), rgba(239, 151, 176, 0) 52%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.62),
    0 8px 20px rgba(16, 24, 40, 0.06);
  -webkit-backdrop-filter: saturate(185%) blur(16px);
  backdrop-filter: saturate(185%) blur(16px);
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 0;
  min-height: var(--control-height);
}

.brand-logo {
  width: 30px;
  height: 30px;
  display: block;
  flex-shrink: 0;
  object-fit: cover;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
  margin-left: -1px;
}

.brand-image-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--control-height);
  text-decoration: none;
}

.brand-image {
  display: block;
  height: 40px;
  width: auto;
  max-width: 240px;
  object-fit: contain;
}

.top-nav {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  margin-left: auto;
  gap: 0.5rem;
}

.nav-link {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--control-height);
  padding: 0.72rem 0.95rem;
  border-radius: var(--radius-control);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.75);
  color: var(--text);
  text-decoration: none;
  font-weight: 550;
  font-size: 0.92rem;
  box-shadow: var(--shadow-xs);
  transition: border-color 140ms ease, background-color 140ms ease, box-shadow 140ms ease, transform 140ms ease;
}

.nav-link:hover {
  border-color: rgba(239, 151, 176, 0.35);
  background: #fff;
  transform: translateY(-1px);
}

.nav-link:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.nav-user-cluster {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-button {
  width: var(--control-height);
  height: var(--control-height);
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-control);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  color: var(--accent-strong);
  box-shadow: var(--shadow-xs);
  text-decoration: none;
  transition: border-color 140ms ease, background-color 140ms ease, box-shadow 140ms ease, transform 140ms ease;
}

.icon-button:hover {
  border-color: rgba(239, 151, 176, 0.35);
  background: #fff;
  transform: translateY(-1px);
}

.icon-button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.icon-button svg {
  width: 18px;
  height: 18px;
  display: block;
}

.page-shell {
  width: min(100%, 1040px);
  margin: 0 auto;
  padding: 1rem 1rem 2.25rem;
}

.student-ads-strip {
  position: sticky;
  top: var(--site-header-height);
  z-index: 36;
  width: min(calc(100% - 2rem), 1008px);
  margin: 0.35rem auto 0;
  padding: 0.7rem 1rem 0.75rem;
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.62);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(248, 249, 253, 0.72)),
    radial-gradient(120% 140% at 0% 0%, rgba(239, 151, 176, 0.08), rgba(239, 151, 176, 0) 48%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.75),
    0 10px 26px rgba(16, 24, 40, 0.08);
  backdrop-filter: saturate(180%) blur(16px);
}

.student-ads-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.45rem;
  padding: 0 0.15rem;
}

.student-ads-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid rgba(239, 151, 176, 0.2);
  background: rgba(239, 151, 176, 0.08);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.student-ads-dots {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.35rem;
  min-height: 24px;
}

.student-ads-dot {
  appearance: none;
  width: 7px;
  height: 7px;
  border: none;
  border-radius: 999px;
  padding: 0;
  background: rgba(110, 110, 115, 0.26);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22);
  transition: width 180ms ease, background-color 180ms ease, transform 180ms ease;
  cursor: pointer;
}

.student-ads-dot:hover {
  background: rgba(239, 151, 176, 0.45);
}

.student-ads-dot.is-active {
  width: 18px;
  background: linear-gradient(90deg, rgba(239, 151, 176, 0.95), rgba(233, 127, 160, 0.95));
  transform: translateY(-0.5px);
}

.student-ads-window {
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid rgba(239, 151, 176, 0.18);
  background:
    radial-gradient(120% 140% at 8% 8%, rgba(239, 151, 176, 0.09), rgba(239, 151, 176, 0) 42%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.93), rgba(250, 250, 253, 0.9));
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.75) inset,
    0 0 0 1px rgba(255, 255, 255, 0.18),
    0 10px 24px rgba(16, 24, 40, 0.06);
  backdrop-filter: saturate(180%) blur(12px);
  touch-action: pan-y;
  cursor: grab;
}

.student-ads-window.is-dragging {
  cursor: grabbing;
}

.student-ads-track {
  display: flex;
  transition: transform 340ms ease;
  will-change: transform;
}

.student-ad-card {
  flex: 0 0 100%;
  min-width: 100%;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  align-items: center;
  gap: 0.72rem;
  padding: 0.78rem 0.82rem;
  color: var(--text);
  text-decoration: none;
  user-select: none;
  -webkit-user-select: none;
}

.student-ad-card:focus-visible {
  outline: none;
  box-shadow: inset var(--focus-ring);
}

.student-ad-thumb {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  border: 1px solid rgba(239, 151, 176, 0.18);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(242, 242, 247, 0.9));
  box-shadow:
    0 8px 20px rgba(16, 24, 40, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

.student-ad-thumb img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  position: relative;
  z-index: 1;
}

.student-ad-thumb-fallback {
  position: absolute;
  inset: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-strong);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.student-ad-thumb.is-fallback .student-ad-thumb-fallback {
  color: var(--accent-strong);
}

.student-ad-content {
  min-width: 0;
  display: grid;
  gap: 0.16rem;
}

.student-ad-title {
  display: block;
  font-size: 1rem;
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.student-ad-text {
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: color-mix(in srgb, var(--muted) 92%, var(--text) 8%);
  font-size: 0.8rem;
  line-height: 1.22;
}

.student-ads-strip + .page-shell {
  padding-top: 0.75rem;
}

.page-head {
  margin-bottom: 1rem;
}

.page-head-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.lesson-date-strip {
  margin: 0 0 0.95rem;
}

.lesson-date-scroll {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.1rem;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}

.lesson-date-scroll::-webkit-scrollbar {
  display: none;
}

.lesson-date-indicator {
  margin-top: 0.34rem;
  height: 4px;
  border-radius: 999px;
  background: rgba(214, 216, 226, 0.62);
  overflow: hidden;
}

.lesson-date-indicator.is-hidden {
  display: none;
}

.lesson-date-indicator-fill {
  height: 100%;
  width: 36%;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(239, 151, 176, 0.9), rgba(233, 127, 160, 0.92));
  transform: translateX(0);
  transition: transform 120ms linear, width 120ms linear;
}

.lesson-date-chip {
  flex: 0 0 auto;
  width: max-content;
  min-height: 40px;
  padding: 10px 6px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  gap: 0.28rem;
  box-shadow: var(--shadow-xs);
  transition: border-color 140ms ease, background-color 140ms ease, transform 140ms ease, color 140ms ease;
}

.lesson-date-chip:hover {
  border-color: rgba(239, 151, 176, 0.32);
  background: #fff;
  transform: translateY(-1px);
}

.lesson-date-chip:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.lesson-date-chip.is-active {
  border-color: rgba(239, 151, 176, 0.45);
  background: rgba(239, 151, 176, 0.12);
  color: var(--accent-strong);
}

.lesson-date-chip-day {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.96rem;
  line-height: 1;
}

.lesson-date-chip-month {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 650;
  font-size: 0.8rem;
  line-height: 1;
  letter-spacing: 0.01em;
}

.eyebrow {
  margin: 0 0 0.2rem;
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--text);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(1.35rem, 2.1vw + 0.7rem, 1.9rem);
  line-height: 1.08;
  font-weight: 700;
}

h2 {
  font-size: 1.08rem;
  line-height: 1.2;
  font-weight: 650;
}

h3 {
  font-size: 1rem;
  line-height: 1.2;
  font-weight: 650;
}

.muted {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.small-note {
  font-size: 0.85rem;
}

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.88));
  border: 1px solid rgba(214, 216, 226, 0.9);
  border-radius: var(--radius-card);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
}

.login-card {
  width: min(100%, 430px);
  margin: clamp(1rem, 8vh, 4rem) auto 0;
  padding: 1.05rem;
}

.login-body {
  background:
    radial-gradient(120% 120% at -10% -8%, rgba(239, 151, 176, 0.18), rgba(239, 151, 176, 0) 42%),
    radial-gradient(90% 90% at 108% 2%, rgba(233, 127, 160, 0.14), rgba(233, 127, 160, 0) 38%),
    linear-gradient(180deg, #f8f8fb, #f2f3f8);
}

.page-shell.page-shell-login {
  width: 100%;
  max-width: none;
  min-height: 100dvh;
  margin: 0;
  padding: 1rem;
  display: grid;
  place-items: center;
}

.login-scene {
  width: min(100%, 560px);
  position: relative;
  isolation: isolate;
  padding: clamp(0.35rem, 2.5vw, 0.9rem);
}

.login-orb {
  position: absolute;
  border-radius: 999px;
  filter: blur(18px);
  pointer-events: none;
  z-index: -1;
  animation: login-float 8.4s ease-in-out infinite;
}

.login-orb-one {
  width: 180px;
  height: 180px;
  top: -28px;
  left: -20px;
  background: rgba(239, 151, 176, 0.2);
}

.login-orb-two {
  width: 148px;
  height: 148px;
  right: -16px;
  top: 24%;
  background: rgba(233, 127, 160, 0.16);
  animation-delay: -2.2s;
}

.login-orb-three {
  width: 124px;
  height: 124px;
  bottom: -18px;
  left: 26%;
  background: rgba(239, 151, 176, 0.14);
  animation-delay: -4.1s;
}

.login-panel {
  padding: 1.05rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.84)),
    radial-gradient(110% 150% at 0% 0%, rgba(239, 151, 176, 0.09), rgba(239, 151, 176, 0) 44%);
  backdrop-filter: saturate(180%) blur(14px);
  border-color: rgba(214, 216, 226, 0.74);
}

.login-brand-image-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  text-decoration: none;
}

.login-brand-image {
  height: 84px;
  width: auto;
  max-width: min(100%, 330px);
  object-fit: contain;
  display: block;
}

.login-copy {
  margin-top: 0.55rem;
  text-align: center;
}

.login-copy h1 {
  font-size: clamp(1.3rem, 2.8vw + 0.45rem, 1.9rem);
  font-weight: 800;
}

.login-copy p {
  margin: 0.32rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.login-form {
  margin-top: 0.95rem;
}

.login-form .button {
  width: 100%;
}

@keyframes login-float {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }

  50% {
    transform: translate3d(0, -8px, 0) scale(1.02);
  }
}

.stack-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  margin-top: 0.9rem;
}

.stack-form label {
  display: grid;
  gap: 0.38rem;
  min-width: 0;
}

.stack-form span {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 500;
}

input:not([type="checkbox"]),
select {
  width: 100%;
  min-height: var(--control-height);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  border-radius: var(--radius-control);
  padding: 0.75rem 0.9rem;
  font: inherit;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
  transition: border-color 140ms ease, box-shadow 140ms ease, background-color 140ms ease;
}

input:not([type="checkbox"]):focus,
select:focus {
  outline: none;
  border-color: rgba(239, 151, 176, 0.6);
  box-shadow: var(--focus-ring);
  background: #fff;
}

select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, #8d8d94 50%),
    linear-gradient(135deg, #8d8d94 50%, transparent 50%);
  background-position:
    calc(100% - 18px) calc(50% - 3px),
    calc(100% - 12px) calc(50% - 3px);
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 2.1rem;
}

select option {
  color: var(--text);
}

.button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  min-height: var(--control-height);
  padding: 0.72rem 0.95rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  text-decoration: none;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1;
  color: #fff;
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  box-shadow: 0 8px 18px rgba(239, 151, 176, 0.22);
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease, background-color 140ms ease, filter 140ms ease;
}

.button:hover {
  transform: translateY(-1px);
  filter: saturate(1.03);
}

.button:active {
  transform: translateY(0);
}

.button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring), 0 8px 18px rgba(239, 151, 176, 0.22);
}

.button-secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.92);
  border-color: var(--line);
  box-shadow: var(--shadow-xs);
}

.button-secondary:hover {
  border-color: var(--line-strong);
  background: #fff;
}

.button-danger {
  color: var(--danger);
  background: rgba(255, 255, 255, 0.92);
  border-color: rgba(216, 86, 111, 0.22);
  box-shadow: var(--shadow-xs);
}

.button-danger:hover {
  background: #fff;
  border-color: rgba(216, 86, 111, 0.34);
}

.button-full {
  width: 100%;
}

.button.small {
  min-height: var(--control-height);
  padding: 0.72rem 0.95rem;
  font-size: 0.92rem;
}

.grid-two {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  min-width: 0;
}

.grid-two > * {
  min-width: 0;
}

input[type="date"],
input[type="time"] {
  display: block;
  min-width: 0;
  min-inline-size: 0;
  width: 100%;
  inline-size: 100%;
  max-width: 100%;
  max-inline-size: 100%;
}

.teacher-lesson-form-card {
  overflow-x: hidden;
  overflow-x: clip;
}

.teacher-lesson-form {
  min-width: 0;
}

.teacher-lesson-form label {
  min-width: 0;
  overflow-x: hidden;
  overflow-x: clip;
}

.teacher-lesson-form .grid-two {
  grid-template-columns: minmax(0, 1fr);
}

.teacher-lesson-form input[type="date"],
.teacher-lesson-form input[type="time"] {
  -webkit-appearance: none;
  appearance: none;
  box-sizing: border-box;
  display: block;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  min-inline-size: 0;
  inline-size: 100%;
  max-inline-size: 100%;
  margin: 0;
}

.stack-section {
  display: grid;
  gap: 0.9rem;
}

.section-title {
  margin: 0.1rem 0 0;
}

.account-card {
  display: grid;
  gap: 0.85rem;
}

.account-topline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.badge,
.status-chip {
  display: inline-flex;
  align-items: center;
  min-height: var(--chip-height);
  padding: 0.28rem 0.6rem;
  border-radius: var(--radius-chip);
  line-height: 1;
  font-weight: 600;
  border: 1px solid var(--line);
  background: var(--surface-muted);
}

.badge {
  margin-bottom: 0.35rem;
  color: var(--accent-strong);
  border-color: rgba(239, 151, 176, 0.22);
  background: rgba(239, 151, 176, 0.08);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.status-chip {
  align-self: center;
  font-size: 0.76rem;
  color: var(--muted);
}

.status-active {
  color: var(--success);
  background: var(--success-soft);
  border-color: rgba(46, 156, 106, 0.2);
}

.status-paused {
  color: var(--muted);
  background: rgba(110, 110, 115, 0.08);
  border-color: rgba(110, 110, 115, 0.16);
}

.checkbox-line {
  display: flex !important;
  align-items: center;
  gap: 0.65rem;
  min-height: var(--control-height);
  padding: 0.2rem 0;
}

.checkbox-line input {
  width: 1.05rem;
  height: 1.05rem;
  margin: 0;
  accent-color: var(--accent-strong);
  border-radius: 6px;
}

.checkbox-line span {
  margin: 0;
  color: var(--text);
  font-size: 0.9rem;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.action-row form {
  margin: 0;
}

.lesson-card {
  display: grid;
  gap: 0.8rem;
}

.lesson-badge-card {
  border-radius: 22px;
  border: 1px solid rgba(214, 216, 226, 0.95);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-md);
  padding: 0.9rem;
  color: var(--text);
}

.lesson-collapsible {
  overflow: hidden;
  padding: 0;
  gap: 0;
}

.lesson-collapsible[open] {
  box-shadow: 0 16px 38px rgba(16, 24, 40, 0.1);
}

.lesson-collapsible > summary {
  list-style: none;
}

.lesson-collapsible > summary::-webkit-details-marker {
  display: none;
}

.lesson-preview-summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  min-height: 88px;
  padding: 0.95rem 0.9rem;
  cursor: pointer;
  user-select: none;
  line-height: 1;
}

.lesson-preview-summary:focus-visible {
  outline: none;
}

.lesson-collapsible:focus-within {
  box-shadow: var(--shadow-md), var(--focus-ring);
}

.lesson-preview-main {
  min-width: 0;
  display: grid;
  gap: 0.28rem;
  align-content: center;
}

.lesson-preview-title-row {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 0.42rem;
}

.lesson-preview-name {
  display: block;
  min-width: 0;
  flex: 1 1 auto;
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.08;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 140ms ease;
}

.lesson-preview-name.is-local-joined {
  color: var(--success);
}

.lesson-preview-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  min-height: 26px;
}

.lesson-preview-side {
  display: inline-flex;
  align-items: center;
  align-self: center;
  gap: 0.45rem;
}

.lesson-local-check {
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid rgba(46, 156, 106, 0.2);
  background: rgba(46, 156, 106, 0.08);
  color: var(--success);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.lesson-local-check svg {
  width: 14px;
  height: 14px;
  display: block;
}

.lesson-preview-count-circle {
  width: 52px;
  height: 52px;
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1;
}

.lesson-chevron {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border: 1px solid rgba(214, 216, 226, 0.9);
  background: rgba(249, 249, 252, 0.92);
  color: var(--muted);
  box-shadow: var(--shadow-xs);
}

.lesson-chevron svg {
  width: 16px;
  height: 16px;
  transition: transform 160ms ease;
}

.lesson-collapsible[open] .lesson-chevron svg {
  transform: rotate(180deg);
}

.lesson-collapsible[open] .lesson-preview-count-circle {
  display: none;
}

.lesson-expanded {
  margin: 0;
  padding: 0.8rem 0.9rem 0.9rem;
  border-top: 1px solid rgba(214, 216, 226, 0.9);
  display: grid;
  gap: 0.75rem;
}

.lesson-expanded-head {
  gap: 0.45rem;
}

.lesson-badge-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.7rem;
}

.lesson-title-pill {
  min-height: 36px;
  padding: 0.35rem 0.8rem;
  border-radius: 16px;
  border: 1px solid rgba(214, 216, 226, 0.95);
  background: rgba(242, 242, 247, 0.85);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-count-circle {
  width: 54px;
  height: 54px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(239, 151, 176, 0.14);
  border: 1px solid rgba(239, 151, 176, 0.24);
  color: var(--accent-strong);
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.lesson-badge-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
}

.lesson-mini-pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0.2rem 0.58rem;
  border-radius: 999px;
  border: 1px solid rgba(214, 216, 226, 0.95);
  background: rgba(242, 242, 247, 0.8);
  color: var(--muted);
  font-size: 0.79rem;
  font-weight: 550;
  line-height: 1;
}

.lesson-id-text {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0 0.2rem;
}

.lesson-state-pill {
  margin-left: auto;
}

.lesson-state-pill.is-open {
  color: var(--success);
  background: var(--success-soft);
  border-color: rgba(46, 156, 106, 0.18);
}

.lesson-state-pill.is-full {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: rgba(216, 86, 111, 0.18);
}

.lesson-joined-details {
  display: grid;
  gap: 0.5rem;
}

.lesson-joined-details > summary {
  list-style: none;
}

.lesson-joined-details > summary::-webkit-details-marker {
  display: none;
}

.lesson-joined-panel {
  border-radius: 16px;
  border: 1px solid rgba(214, 216, 226, 0.9);
  background: rgba(249, 249, 252, 0.9);
  padding: 0.6rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.lesson-inline-empty {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.name-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.lesson-name-chip-list {
  gap: 0.4rem;
}

.name-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0.28rem 0.62rem;
  border-radius: 999px;
  border: 1px solid rgba(214, 216, 226, 0.95);
  background: rgba(255, 255, 255, 0.92);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1;
}

.name-chip-button {
  appearance: none;
  cursor: pointer;
  text-align: left;
  transition: border-color 140ms ease, background-color 140ms ease, color 140ms ease, transform 140ms ease;
}

.name-chip-button:hover {
  border-color: rgba(239, 151, 176, 0.28);
  background: #fff;
  color: var(--text);
  transform: translateY(-1px);
}

.name-chip-button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.lesson-outline-button {
  justify-content: center;
}

.lesson-badge-note {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
}

.lesson-join-slot {
  display: grid;
  gap: 0.55rem;
}

.lesson-join-slot[hidden] {
  display: none !important;
}

.lesson-leave-slot {
  display: grid;
  gap: 0.55rem;
}

.lesson-leave-slot[hidden],
.lesson-local-check[hidden] {
  display: none !important;
}

.lesson-leave-form {
  margin: 0;
}

body.modal-open {
  overflow: hidden;
}

.teacher-kickout-modal {
  position: fixed;
  inset: 0;
  z-index: 130;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.teacher-kickout-modal[hidden] {
  display: none !important;
}

.teacher-kickout-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 12, 0.28);
  backdrop-filter: blur(3px);
}

.teacher-kickout-dialog {
  position: relative;
  z-index: 1;
  width: min(100%, 360px);
  border-radius: 18px;
  padding: 0.95rem;
  display: grid;
  gap: 0.7rem;
  box-shadow: 0 20px 46px rgba(16, 24, 40, 0.14);
}

.teacher-kickout-title {
  margin: 0;
  font-size: 1rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.teacher-kickout-name {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.25;
}

.teacher-kickout-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.teacher-kickout-actions form {
  margin: 0;
}

.teacher-kickout-actions .button,
.teacher-kickout-actions form .button {
  width: 100%;
}

.join-details {
  border-radius: 16px;
  border: 1px solid rgba(214, 216, 226, 0.9);
  background: rgba(249, 249, 252, 0.9);
  padding: 0.55rem;
}

.join-details > summary {
  list-style: none;
}

.join-details > summary::-webkit-details-marker {
  display: none;
}

.join-details[open] > summary {
  margin-bottom: 0.65rem;
}

.lesson-join-box {
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.join-form {
  margin-top: 0;
}

.lesson-badge-card .stack-form {
  gap: 0.75rem;
}

.lesson-badge-card .stack-form span {
  color: var(--muted);
}

.lesson-badge-card input:not([type="checkbox"]),
.lesson-badge-card select {
  background: #fff;
}

.lesson-badge-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.lesson-badge-actions form {
  margin: 0;
}

.lesson-badge-actions .button,
.lesson-badge-actions form .button {
  width: 100%;
}

code {
  background: rgba(242, 242, 247, 0.9);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.12rem 0.35rem;
  font-family: "SF Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.88em;
}

@media (min-width: 720px) {
  .site-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 1.25rem;
  }

  .top-nav {
    justify-content: flex-end;
    min-width: 42%;
  }

  .page-shell {
    padding: 1.2rem 1.25rem 2.8rem;
  }

  .page-shell.page-shell-login {
    width: 100%;
    max-width: none;
    min-height: 100dvh;
    margin: 0;
    padding: 1.25rem;
    display: grid;
    place-items: center;
  }

  .student-ads-strip {
    width: min(calc(100% - 2.5rem), 1037.5px);
    padding: 0.8rem 1.25rem 0.85rem;
  }

  .student-ad-card {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 0.82rem;
    padding: 0.88rem 0.95rem;
  }

  .student-ad-thumb {
    width: 68px;
    height: 68px;
    border-radius: 17px;
  }

  .student-ad-title {
    font-size: 1.04rem;
  }

  .student-ad-text {
    font-size: 0.83rem;
  }

  .page-head-row {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .grid-two {
    grid-template-columns: 1fr 1fr;
  }

  .teacher-lesson-form .grid-two {
    grid-template-columns: 1fr 1fr;
  }

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

  .lesson-badge-card {
    padding: 1rem;
  }

  .lesson-preview-count-circle {
    width: 50px;
    height: 50px;
  }

  .lesson-badge-head {
    grid-template-columns: minmax(0, 1fr) 58px;
  }

  .lesson-count-circle {
    width: 58px;
    height: 58px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto;
  }

  .button,
  .nav-link {
    transition: none;
  }

  .button:hover,
  .nav-link:hover {
    transform: none;
  }

  .login-orb {
    animation: none;
  }
}