:root {
  --beta-bg: #090b24;
  --beta-bg-soft: #151a48;
  --beta-bg-deep: #06071a;
  --beta-panel: rgba(12, 16, 46, 0.92);
  --beta-panel-strong: rgba(14, 19, 58, 0.98);
  --beta-panel-glow: rgba(78, 217, 194, 0.08);
  --beta-purple: #8160ff;
  --beta-purple-soft: rgba(141, 92, 255, 0.16);
  --beta-pink: #ff77c8;
  --beta-pink-soft: rgba(255, 119, 200, 0.18);
  --beta-blue: #62d7ff;
  --beta-electric: #6dffb5;
  --beta-ink: #eef6fb;
  --beta-muted: #9eb3c2;
  --beta-muted-strong: #c8d9e4;
  --beta-teal: #4ed9c2;
  --beta-teal-soft: rgba(78, 217, 194, 0.12);
  --beta-clay: #ff8b65;
  --beta-clay-soft: rgba(255, 139, 101, 0.14);
  --beta-gold: #f3c46b;
  --beta-lime: #d3ff58;
  --beta-lime-soft: rgba(211, 255, 88, 0.16);
  --beta-line: rgba(255, 255, 255, 0.08);
  --beta-line-strong: rgba(211, 255, 88, 0.24);
  --beta-shadow: 0 22px 70px rgba(0, 0, 0, 0.34);
  --beta-radius-xl: 28px;
  --beta-radius-lg: 22px;
  --beta-radius-md: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Helvetica Neue", "Trebuchet MS", sans-serif;
  font-weight: 400;
  color: var(--beta-ink);
  background:
    radial-gradient(circle at 16% 8%, rgba(129, 96, 255, 0.34), transparent 20%),
    radial-gradient(circle at 84% 12%, rgba(255, 119, 200, 0.24), transparent 22%),
    radial-gradient(circle at 50% 88%, rgba(98, 215, 255, 0.14), transparent 28%),
    linear-gradient(145deg, rgba(211, 255, 88, 0.045), transparent 16%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.03) 0, rgba(255, 255, 255, 0.03) 1px, transparent 1px, transparent 82px),
    repeating-linear-gradient(180deg, rgba(255, 255, 255, 0.018) 0, rgba(255, 255, 255, 0.018) 1px, transparent 1px, transparent 82px),
    linear-gradient(180deg, var(--beta-bg-deep) 0%, #0c1140 52%, #171e61 100%);
  overflow: auto;
}

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

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

.beta-shell {
  width: min(1440px, calc(100% - 1rem));
  min-height: calc(100dvh - 1rem);
  margin: 0.5rem auto;
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  gap: 0.85rem;
}

.beta-header,
.beta-mode-card,
.beta-lesson-card {
  position: relative;
  background:
    linear-gradient(180deg, rgba(13, 17, 52, 0.98), rgba(8, 12, 34, 0.96)),
    radial-gradient(circle at top right, rgba(98, 215, 255, 0.1), transparent 45%);
  border: 1px solid var(--beta-line);
  box-shadow: var(--beta-shadow);
  border-radius: var(--beta-radius-xl);
  backdrop-filter: blur(18px);
  overflow: clip;
}

.beta-header,
.beta-mode-card,
.beta-lesson-card {
  padding: 1rem;
}

.beta-header::before,
.beta-lesson-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 44%;
  height: 44%;
  background: radial-gradient(circle, rgba(129, 96, 255, 0.28), transparent 68%);
  pointer-events: none;
}

.beta-header::after,
.beta-mode-card::after,
.beta-lesson-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.03),
    inset 0 -24px 60px rgba(0, 0, 0, 0.16);
}

.beta-lesson-card::after {
  inset: auto;
  right: -8%;
  top: -12%;
  width: 280px;
  height: 280px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(255, 119, 200, 0.18), transparent 64%);
  pointer-events: none;
  box-shadow: none;
}

.beta-header {
  grid-column: 1 / -1;
  grid-row: 1;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
  align-items: start;
  padding: 1.05rem 1.15rem 1rem;
}

.beta-header::before {
  width: 42%;
  height: 58%;
}

.beta-header-copy {
  position: relative;
  z-index: 1;
}

.beta-mode-card {
  grid-column: 1;
  grid-row: 2;
  display: grid;
  align-content: start;
  gap: 0.8rem;
}

.beta-lesson-card {
  grid-column: 2;
  grid-row: 2;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  min-height: 0;
}

.beta-footer-links {
  grid-column: 1 / -1;
}

.beta-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
  color: var(--beta-teal);
  text-decoration: none;
  font-weight: 600;
}

.beta-orb {
  position: absolute;
  pointer-events: none;
  border-radius: 999px;
  background:
    radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.22) 28%, transparent 54%),
    radial-gradient(circle at 68% 38%, rgba(243, 196, 107, 0.92), transparent 34%),
    radial-gradient(circle at 42% 62%, rgba(141, 92, 255, 0.95), transparent 48%),
    radial-gradient(circle at 58% 58%, rgba(121, 197, 255, 0.92), transparent 52%);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.16),
    0 0 26px rgba(141, 92, 255, 0.28),
    0 0 70px rgba(255, 119, 200, 0.18);
}

.beta-header-orb {
  width: 88px;
  height: 88px;
  right: 1rem;
  top: 0.9rem;
  opacity: 0.46;
}

.beta-back::before {
  content: "←";
}

.beta-eyebrow,
.beta-label {
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--beta-lime);
  text-shadow: 0 0 16px rgba(211, 255, 88, 0.18);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Avenir Next", "Helvetica Neue", "Trebuchet MS", sans-serif;
  font-weight: 600;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(1.9rem, 3.9vw, 3.2rem);
  line-height: 0.92;
  max-width: none;
  overflow-wrap: anywhere;
  color: #f4f7ff;
  text-shadow: none;
}

h2 {
  font-size: clamp(1.35rem, 2.3vw, 2.2rem);
}

h3 {
  font-size: 1.04rem;
}

.beta-intro,
.beta-small,
.beta-step-copy,
.beta-audio-note,
.beta-feedback-summary,
.beta-summary-text,
.beta-area-summary,
.beta-comparison-side p {
  color: var(--beta-muted);
  line-height: 1.5;
}

.beta-intro {
  margin: 0.75rem 0 0;
  max-width: 52ch;
}

.beta-mode-grid {
  display: grid;
  gap: 0.65rem;
}

.beta-mode-button,
.beta-button,
.beta-select,
.beta-textarea {
  border-radius: 18px;
}

.beta-mode-button {
  width: 100%;
  padding: 0.95rem;
  border: 1px solid var(--beta-line);
  background:
    radial-gradient(circle at top right, rgba(121, 197, 255, 0.12), transparent 52%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.015));
  color: var(--beta-muted-strong);
  text-align: left;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background 160ms ease;
  position: relative;
  overflow: hidden;
}

.beta-mode-button::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 5px;
  background: linear-gradient(90deg, rgba(129, 96, 255, 0.8), rgba(255, 119, 200, 0.8), rgba(98, 215, 255, 0.8), rgba(211, 255, 88, 0.88));
  opacity: 0.42;
}

.beta-mode-button strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--beta-ink);
  font-weight: 600;
}

.beta-mode-button.is-active {
  border-color: transparent;
  background:
    radial-gradient(circle at 72% 30%, rgba(255, 255, 255, 0.2), transparent 28%),
    linear-gradient(135deg, #4a248e 0%, #6c3ef0 24%, #2497d7 58%, #4ed9c2 82%, #d3ff58 100%);
  color: #f6fff0;
  box-shadow:
    0 18px 32px rgba(108, 62, 240, 0.28),
    0 0 22px rgba(211, 255, 88, 0.16);
}

.beta-mode-button:hover,
.beta-button:hover {
  transform: translateY(-1px) scale(1.004);
}

.beta-lesson-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
  margin-bottom: 0.7rem;
}

.beta-progress-pill {
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--beta-muted-strong);
  padding: 0.55rem 0.8rem;
  font-weight: 600;
  white-space: normal;
  border: 1px solid rgba(255, 255, 255, 0.08);
  text-align: right;
}

.beta-progress-shell {
  display: grid;
  gap: 0.55rem;
  margin: 0 0 0.9rem;
  padding: 0.95rem 1rem;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 119, 200, 0.14), transparent 28%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03), transparent 16%, transparent 84%, rgba(255, 255, 255, 0.03)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.015));
}

.beta-progress-copy {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: baseline;
}

.beta-progress-kicker {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--beta-lime);
  text-transform: uppercase;
}

.beta-progress-track {
  width: 100%;
  height: 14px;
  border-radius: 999px;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.06) 0, rgba(255, 255, 255, 0.06) 12px, rgba(255, 255, 255, 0.03) 12px, rgba(255, 255, 255, 0.03) 24px),
    rgba(255, 255, 255, 0.08);
  overflow: hidden;
  box-shadow: inset 0 0 14px rgba(0, 0, 0, 0.28);
}

.beta-progress-fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background:
    linear-gradient(90deg, var(--beta-purple) 0%, var(--beta-pink) 24%, var(--beta-blue) 54%, var(--beta-teal) 76%, var(--beta-electric) 90%, var(--beta-lime) 100%);
  box-shadow:
    0 0 18px rgba(141, 92, 255, 0.36),
    0 0 30px rgba(211, 255, 88, 0.14);
  transition: width 220ms ease;
}

.beta-stepper {
  list-style: none;
  padding: 0;
  margin: 0 0 0.8rem;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.55rem;
}

.beta-stepper li {
  border-radius: 16px;
  border: 1px solid var(--beta-line);
  background:
    radial-gradient(circle at top right, rgba(121, 197, 255, 0.08), transparent 38%),
    rgba(255, 255, 255, 0.02);
  padding: 0.65rem 0.7rem;
  min-height: 78px;
  display: grid;
  gap: 0.25rem;
  align-content: start;
  position: relative;
  overflow: hidden;
}

.beta-stepper li::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, rgba(129, 96, 255, 0.9), rgba(255, 119, 200, 0.9), rgba(98, 215, 255, 0.88), rgba(211, 255, 88, 0.9));
  opacity: 0.28;
}

.beta-stepper li.is-current {
  border-color: var(--beta-line-strong);
  background:
    radial-gradient(circle at 75% 22%, rgba(255, 119, 200, 0.18), transparent 34%),
    linear-gradient(180deg, rgba(141, 92, 255, 0.2), rgba(255, 255, 255, 0.03));
  box-shadow: 0 12px 24px rgba(18, 26, 78, 0.28);
}

.beta-stepper li.is-done {
  background:
    linear-gradient(180deg, rgba(78, 217, 194, 0.08), rgba(255, 255, 255, 0.02)),
    rgba(78, 217, 194, 0.06);
}

.beta-step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--beta-muted);
  font-weight: 700;
}

.beta-stepper li.is-current .beta-step-number {
  background: linear-gradient(135deg, var(--beta-purple), var(--beta-blue), var(--beta-lime));
  color: #fff;
  box-shadow: 0 0 20px rgba(141, 92, 255, 0.3);
}

.beta-step-title {
  font-weight: 600;
  overflow-wrap: anywhere;
}

.beta-stage {
  min-height: 0;
  overflow: auto;
  border-radius: var(--beta-radius-lg);
  background:
    radial-gradient(circle at top right, rgba(121, 197, 255, 0.08), transparent 30%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02), transparent 12%, transparent 88%, rgba(255, 255, 255, 0.02)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.018));
  border: 1px solid var(--beta-line);
  padding: 0.95rem;
}

.beta-stage.is-selection {
  overflow: visible;
}

.beta-stack,
.beta-grid,
.beta-writing-layout,
.beta-reading-grid,
.beta-compare-grid,
.beta-feedback-grid,
.beta-select-grid,
.beta-support-list {
  display: grid;
  gap: 0.85rem;
}

.beta-grid,
.beta-writing-layout,
.beta-feedback-grid {
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.85fr);
}

.beta-select-grid,
.beta-compare-grid,
.beta-reading-grid,
.beta-comparison-sides {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.beta-card,
.beta-helper,
.beta-audio-player,
.beta-feedback-card,
.beta-support-card,
.beta-start-band,
.beta-summary-card,
.beta-segment {
  border-radius: var(--beta-radius-md);
  border: 1px solid var(--beta-line);
  background:
    radial-gradient(circle at top right, rgba(121, 197, 255, 0.06), transparent 40%),
    rgba(255, 255, 255, 0.03);
  padding: 0.95rem;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.beta-mode-button strong,
.beta-mode-button span,
.beta-progress-copy strong,
.beta-progress-kicker,
.beta-small,
.beta-status,
.beta-chip,
.beta-check,
.beta-feedback-summary,
.beta-summary-text,
.beta-area-summary,
.beta-comparison-side p,
.beta-lesson-top h2,
.beta-helper strong,
.beta-support-card h3,
.beta-popup h3,
.beta-popup p,
.beta-button,
.beta-select-label,
.beta-step-copy {
  overflow-wrap: anywhere;
}

.beta-helper {
  background:
    radial-gradient(circle at 82% 20%, rgba(255, 119, 200, 0.2), transparent 26%),
    linear-gradient(135deg, rgba(129, 96, 255, 0.22), rgba(98, 215, 255, 0.1));
}

.beta-start-band {
  display: grid;
  gap: 0.7rem;
  align-content: start;
  background:
    radial-gradient(circle at 86% 16%, rgba(255, 119, 200, 0.22), transparent 26%),
    linear-gradient(135deg, rgba(98, 215, 255, 0.14), rgba(129, 96, 255, 0.24));
}

.beta-start-band .beta-button-primary {
  min-height: 54px;
}

.beta-helper strong,
.beta-support-card strong,
.beta-feedback-card strong {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
}

.beta-select-label {
  display: grid;
  gap: 0.45rem;
  font-weight: 600;
}

.beta-select,
.beta-textarea {
  width: 100%;
  border: 1px solid var(--beta-line);
  background: rgba(4, 13, 20, 0.7);
  padding: 0.9rem 1rem;
  color: var(--beta-ink);
}

.beta-select:focus,
.beta-textarea:focus,
.beta-button:focus-visible,
.beta-mode-button:focus-visible,
.beta-back:focus-visible {
  outline: 2px solid rgba(78, 217, 194, 0.8);
  outline-offset: 2px;
}

.beta-chip-row,
.beta-checks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.beta-chip,
.beta-check {
  border-radius: 999px;
  padding: 0.38rem 0.68rem;
  font-size: 0.86rem;
  font-weight: 700;
}

.beta-link-card {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.15rem;
  padding: 0.95rem 1rem;
  border-radius: var(--beta-radius-xl);
  border: 1px solid var(--beta-line);
  background:
    linear-gradient(180deg, rgba(13, 17, 52, 0.98), rgba(8, 12, 34, 0.96)),
    radial-gradient(circle at top right, rgba(98, 215, 255, 0.1), transparent 45%);
  box-shadow: var(--beta-shadow);
  position: relative;
  overflow: clip;
}

.beta-link-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.03),
    inset 0 -24px 60px rgba(0, 0, 0, 0.16);
}

.beta-link-card > * {
  position: relative;
  z-index: 1;
}

.beta-link-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.beta-link-button {
  display: block;
  padding: 0.82rem 0.95rem;
  border-radius: 16px;
  border: 1px solid var(--beta-line);
  background:
    radial-gradient(circle at top right, rgba(98, 215, 255, 0.08), transparent 42%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.015));
  color: var(--beta-ink);
  text-decoration: none;
  font-weight: 600;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
  position: relative;
  overflow: hidden;
}

.beta-link-button::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 4px;
  background: linear-gradient(90deg, rgba(98, 215, 255, 0.9), rgba(211, 255, 88, 0.9));
  opacity: 0.42;
}

.beta-link-button:hover {
  transform: translateY(-1px);
  border-color: rgba(211, 255, 88, 0.28);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
}

.beta-chip {
  background: var(--beta-lime-soft);
  color: #f2ffd1;
  border: 1px solid rgba(211, 255, 88, 0.24);
}

.beta-audio-player {
  display: grid;
  gap: 0.8rem;
}

.beta-audio-header {
  display: flex;
  justify-content: space-between;
  gap: 0.85rem;
  align-items: start;
}

.beta-audio-progress {
  display: grid;
  gap: 0.45rem;
}

.beta-audio-bar {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.beta-audio-fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--beta-purple), var(--beta-blue), var(--beta-teal), var(--beta-lime));
  box-shadow:
    0 0 24px rgba(141, 92, 255, 0.3),
    0 0 30px rgba(211, 255, 88, 0.1);
}

.beta-segment-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.beta-segment {
  padding: 0.7rem 0.75rem;
}

.beta-segment strong {
  display: block;
  margin-bottom: 0.1rem;
}

.beta-segment.is-active {
  border-color: var(--beta-line-strong);
  background:
    radial-gradient(circle at top right, rgba(255, 119, 200, 0.14), transparent 28%),
    rgba(141, 92, 255, 0.14);
  box-shadow: 0 12px 22px rgba(19, 28, 80, 0.22);
}

.beta-segment.is-done,
.beta-summary-card.is-done {
  background: rgba(78, 217, 194, 0.06);
}

.beta-summary-card {
  display: grid;
  gap: 0.55rem;
}

.beta-summary-card.is-active {
  border-color: var(--beta-line-strong);
  background:
    radial-gradient(circle at 82% 18%, rgba(121, 197, 255, 0.12), transparent 28%),
    rgba(141, 92, 255, 0.1);
}

.beta-area-title {
  margin-bottom: 0.25rem;
}

.beta-comparison-card {
  display: grid;
  gap: 0.7rem;
}

.beta-comparison-side {
  border-radius: 14px;
  border: 1px solid var(--beta-line);
  background: rgba(255, 255, 255, 0.02);
  padding: 0.8rem;
}

.beta-textarea {
  min-height: 210px;
  resize: vertical;
  line-height: 1.55;
}

.beta-popup-textarea {
  min-height: 150px;
}

.beta-exam-bar {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
  padding: 0.95rem 1rem;
  border-radius: 18px;
  border: 1px solid var(--beta-line);
  background:
    radial-gradient(circle at 82% 18%, rgba(121, 197, 255, 0.12), transparent 24%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025), transparent 10%, transparent 90%, rgba(255, 255, 255, 0.025)),
    rgba(255, 255, 255, 0.03);
}

.beta-exam-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.beta-exam-time {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.03em;
}

.beta-exam-time.is-expired {
  color: #ff9875;
}

.beta-exam-state-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(211, 255, 88, 0.2);
  background:
    linear-gradient(135deg, rgba(211, 255, 88, 0.16), rgba(98, 215, 255, 0.08)),
    rgba(211, 255, 88, 0.08);
  color: #eaffb0;
  font-weight: 700;
  text-align: center;
  box-shadow: 0 10px 18px rgba(14, 22, 52, 0.24);
}

.beta-exam-textarea {
  min-height: 340px;
}

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

.beta-coach-section {
  display: grid;
  gap: 0.45rem;
}

.beta-feedback-stack {
  display: grid;
  gap: 0.8rem;
}

.beta-feedback-card-hero {
  gap: 0.85rem;
}

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

.beta-feedback-meta strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
}

.beta-mini-steps {
  display: grid;
  gap: 0.65rem;
}

.beta-mini-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  align-items: start;
  padding: 0.8rem 0.85rem;
  border-radius: 16px;
  border: 1px solid var(--beta-line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.015)),
    rgba(255, 255, 255, 0.025);
}

.beta-mini-step p {
  margin: 0;
}

.beta-mini-step-number {
  display: inline-grid;
  place-items: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--beta-purple), var(--beta-pink));
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 8px 18px rgba(141, 92, 255, 0.28);
}

.beta-feedback-more {
  border-radius: 20px;
  border: 1px solid var(--beta-line);
  background: rgba(255, 255, 255, 0.025);
  padding: 0.9rem 1rem;
}

.beta-feedback-more summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--beta-ink);
  list-style: none;
}

.beta-feedback-more summary::-webkit-details-marker {
  display: none;
}

.beta-feedback-more-body {
  display: grid;
  gap: 0.8rem;
  margin-top: 0.85rem;
}

.beta-support-list,
.beta-bullet-list {
  margin: 0;
  padding-left: 1.05rem;
}

.beta-bullet-list {
  display: grid;
  gap: 0.45rem;
}

.beta-actions {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.8rem;
  position: sticky;
  bottom: 0;
  z-index: 3;
  padding-top: 0.75rem;
  background: linear-gradient(180deg, rgba(10, 18, 28, 0), rgba(10, 18, 28, 0.92) 26%, rgba(10, 18, 28, 0.98) 100%);
}

.beta-button {
  border: none;
  min-height: 48px;
  padding: 0.78rem 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, opacity 160ms ease, filter 160ms ease;
}

.beta-button-primary {
  background:
    radial-gradient(circle at 80% 28%, rgba(255, 255, 255, 0.24), transparent 24%),
    linear-gradient(135deg, #5d37f6 0%, #9a52ff 22%, #ff77c8 44%, #2bc7ff 66%, #7cf36c 84%, #d3ff58 100%);
  color: #fbfff6;
  box-shadow:
    0 14px 28px rgba(93, 55, 246, 0.28),
    0 0 20px rgba(211, 255, 88, 0.12),
    inset 0 -1px 0 rgba(0, 0, 0, 0.18);
}

.beta-button-secondary {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.02)),
    rgba(13, 18, 47, 0.7);
  color: var(--beta-ink);
  border: 1px solid var(--beta-line);
}

.beta-button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  transform: none;
  box-shadow: none;
}

.beta-status {
  margin: 0;
  font-weight: 700;
}

.beta-status.is-ready {
  color: var(--beta-teal);
}

.beta-status.is-error {
  color: #ff9875;
}

.beta-check.is-yes {
  background: rgba(78, 217, 194, 0.12);
  color: var(--beta-teal);
}

.beta-check.is-no {
  background: rgba(255, 139, 101, 0.16);
  color: #ffb39b;
}

.beta-empty {
  display: grid;
  place-items: center;
  min-height: 220px;
  text-align: center;
}

.beta-overlay-shell {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 40;
}

.beta-overlay-backdrop {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(4, 8, 12, 0.76);
  backdrop-filter: blur(6px);
  pointer-events: auto;
}

.beta-popup {
  width: min(640px, 100%);
  max-height: min(88dvh, 760px);
  display: grid;
  gap: 0.9rem;
  padding: 1.05rem;
  border-radius: 24px;
  border: 1px solid var(--beta-line);
  background:
    radial-gradient(circle at 78% 18%, rgba(255, 119, 200, 0.18), transparent 26%),
    radial-gradient(circle at 22% 10%, rgba(129, 96, 255, 0.18), transparent 28%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.022) 0, rgba(255, 255, 255, 0.022) 1px, transparent 1px, transparent 42px),
    linear-gradient(180deg, rgba(18, 24, 58, 0.98), rgba(11, 16, 40, 0.98));
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  position: relative;
  overflow: auto;
}

.beta-popup::before {
  content: "";
  position: absolute;
  width: 130px;
  height: 130px;
  right: -24px;
  top: -32px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 40% 38%, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.1) 24%, transparent 48%),
    radial-gradient(circle at 66% 32%, rgba(243, 196, 107, 0.9), transparent 26%),
    radial-gradient(circle at 42% 60%, rgba(141, 92, 255, 0.82), transparent 40%);
  opacity: 0.9;
  filter: blur(0.3px);
  pointer-events: none;
}

.beta-popup-footer {
  display: grid;
  gap: 0.75rem;
}

.beta-popup > * {
  position: relative;
  z-index: 1;
}

.beta-popup-textarea {
  border-radius: 22px;
  background: rgba(4, 13, 20, 0.86);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

@media (max-width: 1100px) {
  body {
    overflow: auto;
  }

  .beta-shell {
    width: min(100% - 0.85rem, 1200px);
    min-height: auto;
    margin: 0.45rem auto 1rem;
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .beta-header,
  .beta-mode-card,
  .beta-lesson-card,
  .beta-footer-links {
    grid-column: auto;
    grid-row: auto;
  }

  .beta-lesson-card {
    min-height: calc(100dvh - 1.2rem);
  }
}

@media (max-width: 900px) {
  .beta-mode-card {
    gap: 0.55rem;
  }

  .beta-grid,
  .beta-writing-layout,
  .beta-feedback-grid,
  .beta-feedback-meta,
  .beta-reading-grid,
  .beta-compare-grid,
  .beta-comparison-sides,
  .beta-select-grid {
    grid-template-columns: 1fr;
  }

  .beta-stepper {
    grid-template-columns: repeat(5, minmax(120px, 1fr));
    overflow-x: auto;
    padding-bottom: 0.2rem;
  }

  .beta-mode-grid {
    display: flex;
    flex-wrap: nowrap;
    gap: 0.55rem;
    overflow-x: auto;
    padding-bottom: 0.1rem;
    margin-inline: -0.1rem;
    scroll-snap-type: x proximity;
  }

  .beta-mode-grid::-webkit-scrollbar {
    display: none;
  }

  .beta-mode-button {
    flex: 0 0 auto;
    min-width: 190px;
    max-width: 240px;
    padding: 0.78rem 0.85rem 0.72rem;
    scroll-snap-align: start;
  }

  .beta-mode-button strong {
    margin-bottom: 0;
    font-size: 0.95rem;
  }

  .beta-mode-button span {
    display: none;
  }

  .beta-stepper li {
    min-width: 120px;
    min-height: 0;
  }

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

  .beta-link-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  body {
    overflow: auto;
  }

  .beta-shell {
    width: min(100% - 0.6rem, 920px);
    margin: 0.3rem auto 0.9rem;
    gap: 0.55rem;
  }

  .beta-header,
  .beta-mode-card,
  .beta-lesson-card,
  .beta-link-card,
  .beta-stage,
  .beta-popup {
    padding: 0.9rem;
  }

  .beta-overlay-backdrop {
    place-items: end center;
    padding: 0.55rem;
  }

  .beta-lesson-card {
    min-height: auto;
  }

  .beta-lesson-top,
  .beta-progress-copy,
  .beta-exam-bar,
  .beta-audio-header,
  .beta-actions {
    flex-direction: column;
  }

  .beta-exam-actions {
    grid-template-columns: 1fr;
  }

  .beta-button {
    width: 100%;
  }

  .beta-progress-pill {
    align-self: flex-start;
  }

  .beta-stage {
    min-height: 0;
    overflow: visible;
  }

  .beta-stepper {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .beta-stepper li {
    min-width: 0;
  }

  .beta-segment-list {
    grid-template-columns: 1fr;
  }

  .beta-popup {
    width: 100%;
    max-height: min(92dvh, 100%);
    align-self: end;
    border-radius: 24px 24px 0 0;
    padding-bottom: calc(0.95rem + env(safe-area-inset-bottom, 0px));
  }

  .beta-popup-footer {
    position: sticky;
    bottom: 0;
    padding-top: 0.4rem;
    background: linear-gradient(180deg, rgba(11, 16, 40, 0), rgba(11, 16, 40, 0.96) 34%, rgba(11, 16, 40, 1) 100%);
  }

  .beta-popup-textarea {
    min-height: 126px;
  }

  .beta-mode-card > .beta-small {
    display: none;
  }

  .beta-mode-button {
    min-width: 168px;
    max-width: 210px;
    min-height: 54px;
    padding: 0.72rem 0.78rem;
  }

  .beta-link-button {
    padding: 0.78rem 0.88rem;
  }
}