:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #667085;
  --primary: #1454d9;
  --primary-dark: #0e3fa5;
  --accent: #0f766e;
  --warning: #b45309;
  --border: #e5e7ef;
  --success: #077a46;
  --danger: #c43b3b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 64px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  min-width: 0;
}

.logo-mark {
  position: relative;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  background:
    linear-gradient(135deg, #123a8c 0%, #1d4ed8 54%, #0f766e 100%);
  color: #fff;
  box-shadow: 0 9px 20px rgba(29, 78, 216, .18);
}

.logo-mark::after {
  content: "";
  position: absolute;
  right: 6px;
  bottom: 5px;
  width: 9px;
  height: 5px;
  border-right: 2px solid rgba(255, 255, 255, .92);
  border-bottom: 2px solid rgba(255, 255, 255, .92);
  transform: rotate(38deg);
}

.logo-mark span {
  font-size: 21px;
  line-height: 1;
  letter-spacing: 0;
  font-weight: 900;
}

.logo-copy {
  display: grid;
  gap: 0;
}

.logo-copy strong {
  font-size: 21px;
  line-height: 1.05;
  letter-spacing: 0;
}

.logo-copy small {
  color: var(--muted);
  font-size: 10px;
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
}

.hero {
  padding: 72px 0 36px;
  background: linear-gradient(180deg, #ffffff, #f7f8fb);
}

.hero-grid,
.grid-2,
.path-header {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 28px;
  align-items: start;
}

.badge {
  display: inline-block;
  background: #eaf1ff;
  color: var(--primary);
  padding: 6px 12px;
  border-radius: 8px;
  font-weight: 700;
  margin: 0 0 14px;
}

h1 {
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.05;
  letter-spacing: -1.4px;
  margin: 0 0 18px;
}

h2 { margin-top: 0; }

.lead {
  font-size: 19px;
  color: var(--muted);
  max-width: 650px;
}

.actions, .button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  padding: 12px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
  display: inline-block;
  transition: border-color .15s ease, background .15s ease, transform .15s ease;
}

.btn.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn:hover { transform: translateY(-1px); }
.btn.primary:hover { background: var(--primary-dark); }

.full { width: 100%; margin-top: 14px; }

.card, .industry-card, .feature, .module-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  box-shadow: 0 8px 18px rgba(16, 24, 40, .04);
}

.hero-card { margin-top: 8px; }

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

.flow div {
  display: flex;
  gap: 12px;
  align-items: center;
  background: #f6f8ff;
  padding: 14px;
  border-radius: 8px;
}

.flow b {
  background: var(--primary);
  color: #fff;
  width: 30px;
  height: 30px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.industry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin: 24px 0 32px;
}

.industry-card {
  color: var(--text);
  text-decoration: none;
  min-height: 210px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.industry-card:hover,
.lesson-row:hover {
  border-color: #b8c9ff;
  transform: translateY(-2px);
}

.industry-card p, .tool-header p, .small, .lesson-row p {
  color: var(--muted);
}

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

.meta span {
  background: #f1f4f9;
  color: #475467;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
}

.seo-block {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 40px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chips span {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  background: #fafafa;
}

.tool-page {
  padding: 42px 0;
}

.tool-header {
  margin-bottom: 18px;
}

.tool-header h1,
.path-header h1,
.lesson-main h1 {
  font-size: clamp(30px, 4vw, 48px);
}

label {
  display: block;
  font-weight: 700;
  margin: 14px 0 8px;
}

textarea, select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  font-size: 16px;
  background: #fff;
}

pre {
  white-space: pre-wrap;
  word-wrap: break-word;
  background: #f6f8fc;
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 8px;
  min-height: 220px;
  font-family: Arial, Helvetica, sans-serif;
}

.scenario-box {
  border-left: 4px solid var(--primary);
  background: #f6f8ff;
  padding: 14px;
  border-radius: 8px;
  margin: 12px 0;
  font-weight: 700;
}

.question {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}

.option {
  display: block;
  font-weight: 500;
  margin: 10px 0;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

.option:hover { background: #f7f8fb; }

.adbox {
  border: 1px dashed #b9c2d6;
  background: #fff;
  color: #667085;
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  margin: 18px 0;
}

.module-card {
  margin: 20px 0;
}

.lesson-list {
  display: grid;
  gap: 12px;
}

.lesson-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
}

.lesson-row h3 {
  margin: 0 0 6px;
}

.simple-list {
  padding-left: 20px;
}

.breadcrumb {
  margin-bottom: 20px;
  color: var(--muted);
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
}

.lesson-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 84px;
}

.side-link {
  display: block;
  padding: 10px 12px;
  margin: 6px 0;
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  border: 1px solid transparent;
}

.side-link.active,
.side-link:hover {
  background: #eef4ff;
  color: var(--primary);
  border-color: #cfe0ff;
}

.lesson-section {
  margin-bottom: 16px;
  position: relative;
}

.lesson-section h2 {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.lesson-section h3 {
  margin-top: 20px;
  margin-bottom: 10px;
}

.phrase-list {
  padding-left: 20px;
}

.phrase-list li {
  margin: 10px 0;
  font-weight: 700;
}

.dialogue p {
  background: #f8fafc;
  border: 1px solid var(--border);
  padding: 12px;
  border-radius: 8px;
}

.mt { margin-top: 20px; }

.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  background: #fff;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer p {
  margin: 0;
}

.footer-logo .logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  box-shadow: none;
}

.footer-logo .logo-mark span {
  font-size: 19px;
}

.footer-logo .logo-copy strong {
  font-size: 18px;
}

@media (max-width: 980px) {
  .industry-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .lesson-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 820px) {
  .hero-grid, .grid-2, .path-header {
    grid-template-columns: 1fr;
  }

  nav a {
    margin-left: 10px;
    font-size: 14px;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 24px, 1240px);
  }

  .nav {
    min-height: 62px;
  }

  .logo-mark {
    width: 34px;
    height: 34px;
    border-radius: 9px;
  }

  .logo-copy strong {
    font-size: 18px;
  }

  .logo-copy small {
    display: none;
  }

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

  .lesson-row {
    display: block;
  }

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


.skill-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 18px 0;
}

.skill-tabs a {
  color: var(--primary);
  text-decoration: none;
  background: #eef4ff;
  border: 1px solid #cfe0ff;
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: 700;
}

.note-box {
  background: #fff8e6;
  border: 1px solid #ffe3a3;
  padding: 14px;
  border-radius: 8px;
  margin-top: 12px;
}

.listen-box {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0;
}

.exercise-item,
.quiz-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin: 14px 0;
  background: #fbfcff;
}

.answer {
  margin-top: 10px;
  background: #ecfdf3;
  border: 1px solid #b7ebc8;
  color: #075e35;
  padding: 12px;
  border-radius: 8px;
  font-weight: 600;
}

.hidden {
  display: none;
}

.mini-btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--primary);
  padding: 7px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  margin-top: 6px;
}

.tag {
  display: inline-block;
  background: #f1f4f9;
  color: #475467;
  padding: 5px 9px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 800;
}

.reading-passage {
  background: #f8fafc;
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 8px;
  font-size: 17px;
}

.skill-grid,
.mini-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.skill-grid span,
.mini-skills span {
  background: #eef4ff;
  color: var(--primary);
  padding: 6px 10px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 13px;
}

.phrase-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}


.path-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.path-stats span {
  background: #ecfdf3;
  color: #075e35;
  border: 1px solid #b7ebc8;
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: 800;
}

.session-plan {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.session-plan div {
  border: 1px solid var(--border);
  background: #fbfcff;
  padding: 12px;
  border-radius: 8px;
}

.session-plan b {
  color: var(--primary);
  display: block;
  margin-bottom: 4px;
}

@media (max-width: 1000px) {
  .session-plan {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .session-plan {
    grid-template-columns: 1fr;
  }
}


.difficulty-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.difficulty-card {
  border: 1px solid var(--border);
  background: #fbfcff;
  border-radius: 8px;
  padding: 16px;
}

.difficulty-card h3 {
  margin-top: 0;
}

.difficulty-card.medium {
  border-left: 5px solid #2f80ed;
}

.difficulty-card.hard {
  border-left: 5px solid var(--warning);
}

.difficulty-card.expert {
  border-left: 5px solid var(--accent);
}

.exercise-item.compact {
  padding: 12px;
  margin: 10px 0;
}

@media (max-width: 980px) {
  .difficulty-grid {
    grid-template-columns: 1fr;
  }
}


.advanced-box {
  border-left: 5px solid var(--accent);
}

.advanced-terms span {
  background: #0f766e;
  color: #ffffff;
  border-color: #0f766e;
}

.dialogue {
  margin-top: 12px;
}

.option-list {
  display: grid;
  gap: 8px;
  margin: 10px 0;
}

.level-gate {
  display: grid;
  grid-template-columns: minmax(260px, .95fr) minmax(360px, 1.05fr);
  gap: 18px;
  align-items: stretch;
  background:
    linear-gradient(135deg, rgba(20, 84, 217, .10), rgba(15, 118, 110, .08)),
    #ffffff;
  border: 1px solid #d9e3f7;
  border-radius: 8px;
  padding: 20px;
  margin: 22px 0;
  box-shadow: 0 18px 42px rgba(16, 24, 40, .08);
}

.level-gate-copy h2 {
  margin: 0 0 10px;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.12;
}

.level-gate-copy p {
  color: var(--muted);
  margin: 0;
}

.level-switcher {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.level-choice {
  border: 1px solid var(--border);
  background: rgba(255,255,255,.82);
  color: var(--text);
  border-radius: 8px;
  padding: 14px;
  text-align: left;
  cursor: pointer;
  min-height: 132px;
  display: grid;
  align-content: space-between;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease, background .18s ease;
}

.level-choice:hover {
  transform: translateY(-2px);
  border-color: #b8c9ff;
}

.level-choice.active {
  background: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 12px 28px rgba(20, 84, 217, .18);
}

.level-choice span {
  color: var(--primary);
  font-weight: 900;
  font-size: 13px;
}

.level-choice b {
  display: block;
  font-size: 20px;
  line-height: 1.1;
}

.level-choice small {
  color: var(--muted);
  font-weight: 800;
}

.level-panels {
  scroll-margin-top: 92px;
}

.level-panel {
  display: none;
}

.level-panel.active {
  display: block;
  animation: panelIn .22s ease-out;
}

@keyframes panelIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.level-hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 22px;
  margin: 18px 0;
  background: #ffffff;
  box-shadow: 0 14px 34px rgba(16, 24, 40, .06);
}

.level-hero.medium {
  border-left: 6px solid var(--primary);
}

.level-hero.hard {
  border-left: 6px solid var(--warning);
}

.level-hero.expert {
  border-left: 6px solid var(--accent);
}

.level-hero h2 {
  border: 0;
  padding: 0;
  margin: 0 0 8px;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.12;
}

.level-hero p {
  color: var(--muted);
  margin: 0;
}

.level-stat {
  min-width: 150px;
  border: 1px solid var(--border);
  background: #f8fafc;
  border-radius: 8px;
  padding: 14px;
  text-align: center;
}

.level-stat b {
  display: block;
  font-size: 21px;
  color: var(--primary-dark);
}

.level-stat span {
  color: var(--muted);
  font-weight: 800;
  font-size: 13px;
}

.theory-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .85fr);
  gap: 16px;
}

.theory-card {
  height: 100%;
}

.lesson-visual {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  margin: 22px 0;
  box-shadow: 0 12px 28px rgba(16, 24, 40, .06);
}

.visual-scene {
  display: grid;
  grid-template-columns: minmax(150px, .8fr) minmax(240px, 1.4fr) minmax(150px, .8fr);
  gap: 14px;
  align-items: stretch;
}

.speaker-card,
.scenario-pulse {
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 150px;
}

.speaker-card {
  display: grid;
  align-content: center;
  gap: 8px;
  padding: 18px;
  background: #f8fafc;
}

.speaker-card span {
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: #ffffff;
  font-weight: 900;
  font-size: 20px;
}

.speaker-card b {
  font-size: 17px;
}

.speaker-card small {
  color: var(--muted);
  font-weight: 700;
}

.primary-speaker {
  border-left: 5px solid var(--primary);
}

.primary-speaker span {
  background: var(--primary);
}

.secondary-speaker {
  border-left: 5px solid var(--accent);
}

.secondary-speaker span {
  background: var(--accent);
}

.scenario-pulse {
  position: relative;
  overflow: hidden;
  display: grid;
  align-content: center;
  gap: 10px;
  padding: 22px;
  background:
    linear-gradient(135deg, rgba(20, 84, 217, .10), rgba(15, 118, 110, .10)),
    repeating-linear-gradient(45deg, rgba(255,255,255,.55) 0 10px, rgba(248,250,252,.55) 10px 20px);
}

.scenario-pulse::before,
.scenario-pulse::after {
  content: "";
  position: absolute;
  width: 70px;
  height: 70px;
  border: 2px solid rgba(20, 84, 217, .22);
  transform: rotate(45deg);
}

.scenario-pulse::before {
  right: 18px;
  top: -26px;
}

.scenario-pulse::after {
  left: -32px;
  bottom: 14px;
  border-color: rgba(180, 83, 9, .24);
}

.scenario-pulse b,
.scenario-pulse span {
  position: relative;
  z-index: 1;
}

.scenario-pulse b {
  color: var(--primary-dark);
  font-size: 14px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.scenario-pulse span {
  font-size: 20px;
  font-weight: 800;
  line-height: 1.35;
}

.visual-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 14px;
}

.visual-steps div {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  background: #fbfcff;
  padding: 10px;
  border-radius: 8px;
}

.visual-steps b {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff7ed;
  color: var(--warning);
  border: 1px solid #fed7aa;
  border-radius: 50%;
  flex: 0 0 auto;
}

.visual-steps span {
  font-weight: 800;
  font-size: 13px;
}

.visual-terms {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.visual-terms span {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
  padding: 7px 10px;
  border-radius: 8px;
  font-weight: 800;
  font-size: 13px;
}

.lesson-part {
  margin: 28px 0;
}

.part-header {
  border: 1px solid var(--border);
  border-left: 6px solid var(--primary);
  background: #ffffff;
  border-radius: 8px;
  padding: 18px 20px;
  margin-bottom: 14px;
}

.practice-part .part-header {
  border-left-color: var(--accent);
}

.part-header h2 {
  margin: 0 0 8px;
  border: 0;
  padding: 0;
}

.part-header p {
  margin: 0;
  color: var(--muted);
}

.part-kicker {
  color: var(--primary) !important;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-size: 13px;
  margin-bottom: 6px !important;
}

.practice-part .part-kicker {
  color: var(--accent) !important;
}

.voice-status {
  display: inline-block;
  border: 1px solid #cfe0ff;
  background: #eef4ff;
  color: var(--primary-dark);
  padding: 8px 10px;
  border-radius: 8px;
  font-weight: 700;
  margin: 0 0 8px;
}

.dialogue p.active-line {
  border-color: var(--primary);
  background: #eef4ff;
  box-shadow: 0 0 0 3px rgba(20, 84, 217, .10);
}

@media (max-width: 900px) {
  .level-gate,
  .level-hero,
  .theory-grid {
    grid-template-columns: 1fr;
  }

  .level-switcher {
    grid-template-columns: 1fr;
  }

  .visual-scene,
  .visual-steps {
    grid-template-columns: 1fr;
  }

  .speaker-card,
  .scenario-pulse {
    min-height: auto;
  }
}


/* Clean learning workspace redesign */
:root {
  --bg: #f3f5f8;
  --card: #ffffff;
  --text: #111827;
  --muted: #647084;
  --primary: #1d4ed8;
  --primary-dark: #1e3a8a;
  --accent: #0f766e;
  --warning: #a16207;
  --border: #dfe5ee;
  --surface: #f8fafc;
}

body {
  background:
    linear-gradient(180deg, #ffffff 0, #f3f5f8 260px),
    var(--bg);
  color: var(--text);
}

.container {
  width: min(1240px, calc(100% - 40px));
}

h1 {
  letter-spacing: 0;
}

.site-header {
  border-bottom: 1px solid rgba(17, 24, 39, .08);
  box-shadow: 0 1px 0 rgba(17, 24, 39, .02);
}

.nav {
  min-height: 58px;
}

.logo {
  color: var(--text);
}

nav a {
  color: #344054;
  margin-left: 18px;
}

.study-page {
  padding: 28px 0 44px;
}

.study-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.study-sidebar {
  position: sticky;
  top: 78px;
  background: rgba(255, 255, 255, .86);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 10px 26px rgba(15, 23, 42, .05);
}

.sidebar-heading {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.sidebar-heading span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.sidebar-heading b {
  display: block;
  margin-top: 4px;
  font-size: 18px;
}

.lesson-nav-list {
  max-height: calc(100vh - 170px);
  overflow: auto;
  padding: 8px;
}

.side-link {
  font-size: 14px;
  line-height: 1.35;
  padding: 9px 10px;
  margin: 2px 0;
  border-radius: 7px;
}

.side-link.active {
  background: #eaf1ff;
  color: var(--primary-dark);
  border-color: #bfdbfe;
  font-weight: 800;
}

.study-main {
  min-width: 0;
}

.lesson-header {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: clamp(22px, 4vw, 38px);
  box-shadow: 0 18px 42px rgba(15, 23, 42, .06);
}

.lesson-header h1 {
  max-width: 900px;
  font-size: clamp(34px, 4.8vw, 56px);
  line-height: 1.05;
  margin-bottom: 14px;
}

.lesson-header .lead {
  color: #475467;
  font-size: 18px;
  max-width: 780px;
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.lesson-meta span,
.badge {
  border-radius: 7px;
  background: #eef4ff;
  color: var(--primary-dark);
  border: 1px solid #dbeafe;
  padding: 7px 10px;
  font-size: 13px;
  font-weight: 800;
}

.clean-gate {
  grid-template-columns: minmax(0, .85fr) minmax(420px, 1.15fr);
  background: transparent;
  border: 0;
  box-shadow: none;
  padding: 0;
  margin: 22px 0;
}

.level-gate-copy {
  background: #111827;
  color: #ffffff;
  border-radius: 12px;
  padding: 22px;
}

.level-gate-copy .part-kicker,
.level-gate-copy p {
  color: #cbd5e1 !important;
}

.level-gate-copy h2 {
  color: #ffffff;
  font-size: clamp(24px, 3vw, 36px);
}

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

.level-choice {
  min-height: 150px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 12px 24px rgba(15, 23, 42, .05);
}

.level-choice.active {
  border-color: var(--primary);
  box-shadow: 0 16px 34px rgba(29, 78, 216, .16);
}

.level-choice span {
  color: var(--primary);
}

.track-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 150px;
  gap: 18px;
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--border);
  border-left: 6px solid var(--primary);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 18px;
}

.track-header.hard {
  border-left-color: var(--warning);
}

.track-header.expert {
  border-left-color: var(--accent);
}

.track-header h2 {
  border: 0;
  padding: 0;
  margin: 0 0 8px;
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.12;
}

.track-header p {
  color: var(--muted);
  margin: 0;
}

.track-time {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}

.track-time b,
.track-time span {
  display: block;
}

.track-time b {
  font-size: 20px;
  color: var(--primary-dark);
}

.track-time span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.study-columns {
  display: grid;
  grid-template-columns: minmax(300px, .82fr) minmax(0, 1.18fr);
  gap: 18px;
  align-items: start;
}

.theory-column {
  display: grid;
  gap: 14px;
  position: sticky;
  top: 78px;
}

.practice-column {
  display: grid;
  gap: 12px;
}

.study-block,
.skill-block {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, .045);
}

.study-block {
  padding: 20px;
}

.study-block p {
  color: #344054;
  margin: 10px 0;
}

.block-title {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}

.block-title span {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #eaf1ff;
  color: var(--primary-dark);
  font-weight: 900;
}

.block-title h2 {
  border: 0;
  padding: 0;
  margin: 0;
  font-size: 20px;
}

.phrase-stack {
  display: grid;
  gap: 8px;
}

.phrase-stack button {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-align: left;
  padding: 10px;
  border-radius: 8px;
  cursor: pointer;
}

.phrase-stack button:hover {
  border-color: #bfdbfe;
  background: #eef4ff;
}

.phrase-stack b {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  background: #ffffff;
  color: var(--primary);
}

.term-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.term-strip span {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
  border-radius: 7px;
  padding: 7px 9px;
  font-weight: 800;
  font-size: 13px;
}

.vocab-cards,
.phrase-cards {
  display: grid;
  gap: 10px;
}

.vocab-card,
.phrase-card {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  padding: 12px;
}

.vocab-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
}

.vocab-card b {
  display: block;
  font-size: 18px;
  color: var(--text);
}

.vocab-card small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-weight: 800;
}

.vocab-card p,
.phrase-card p {
  margin: 6px 0 0;
  color: #475467;
}

.vocab-card p span {
  font-weight: 900;
  color: var(--primary-dark);
}

.phrase-card button {
  width: 100%;
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  align-items: center;
  border: 0;
  background: transparent;
  color: var(--text);
  text-align: left;
  padding: 0;
  cursor: pointer;
  font-weight: 800;
}

.phrase-card button b {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  background: #eaf1ff;
  color: var(--primary-dark);
}

.learning-flow {
  padding-left: 22px;
  margin-bottom: 0;
}

.learning-flow li {
  margin: 9px 0;
  color: #344054;
}

.voice-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 10px 20px 10px;
}

.voice-controls label {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.voice-controls select {
  margin-top: 6px;
  padding: 10px;
  font-size: 14px;
}

.exercise-group {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 12px;
}

.exercise-group:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.exercise-group h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.read-practice {
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: 8px;
  padding: 10px;
}

.read-practice p {
  margin: 0 0 8px;
  font-weight: 700;
}

.skill-block {
  overflow: hidden;
}

.skill-block summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  border-bottom: 1px solid transparent;
}

.skill-block summary::-webkit-details-marker {
  display: none;
}

.skill-block summary::after {
  content: "+";
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--primary);
  font-weight: 900;
}

.skill-block[open] summary {
  border-bottom-color: var(--border);
}

.skill-block[open] summary::after {
  content: "-";
}

.skill-block summary span {
  font-size: 19px;
  font-weight: 900;
}

.skill-block summary small {
  display: block;
  color: var(--muted);
  font-weight: 700;
  margin-top: 3px;
}

.skill-block > :not(summary) {
  margin-left: 20px;
  margin-right: 20px;
}

.skill-block > :last-child {
  margin-bottom: 20px;
}

.exercise-item,
.quiz-item {
  border-radius: 10px;
  background: var(--surface);
  margin: 12px 0;
}

.reading-passage,
pre,
textarea,
select {
  border-radius: 9px;
}

.clean-checklist {
  padding-left: 20px;
}

.clean-checklist li {
  margin: 8px 0;
}

@media (max-width: 1080px) {
  .study-shell,
  .clean-gate,
  .study-columns,
  .track-header {
    grid-template-columns: 1fr;
  }

  .study-sidebar,
  .theory-column {
    position: static;
  }

  .lesson-nav-list {
    max-height: 260px;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(100% - 24px, 1240px);
  }

  .level-switcher {
    grid-template-columns: 1fr;
  }

  .lesson-header {
    padding: 20px;
  }

  .skill-block summary {
    grid-template-columns: 1fr;
  }

  .vocab-card,
  .voice-controls {
    grid-template-columns: 1fr;
  }
}


/* Five-page public lesson layout */
.clean-lesson {
  display: grid;
  gap: 18px;
}

.compact-header {
  padding: 28px;
}

.compact-header h1 {
  font-size: clamp(34px, 4vw, 52px);
  margin-bottom: 8px;
}

.lesson-page-nav {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  position: sticky;
  top: 58px;
  z-index: 5;
  box-shadow: 0 10px 24px rgba(15, 23, 42, .05);
}

.lesson-page-tab {
  border: 1px solid transparent;
  background: transparent;
  color: #344054;
  border-radius: 8px;
  padding: 11px 10px;
  cursor: pointer;
  font-weight: 900;
  text-align: center;
}

.lesson-page-tab:hover {
  background: var(--surface);
}

.lesson-page-tab.active {
  background: #111827;
  color: #ffffff;
}

.lesson-page {
  display: none;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: clamp(18px, 3vw, 30px);
  box-shadow: 0 18px 42px rgba(15, 23, 42, .06);
}

.lesson-page.active {
  display: block;
}

.page-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
  margin-bottom: 18px;
}

.page-heading span {
  color: var(--primary);
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.page-heading h2 {
  border: 0;
  padding: 0;
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
}

.vocab-table,
.phrase-table {
  display: grid;
  gap: 10px;
}

.vocab-group {
  margin-top: 22px;
}

.vocab-group:first-of-type {
  margin-top: 0;
}

.vocab-group > h3,
.phrase-group > h3 {
  margin: 0 0 10px;
  font-size: 22px;
}

.phrase-group {
  margin-top: 22px;
}

.phrase-group:first-of-type {
  margin-top: 0;
}

.vocab-row,
.phrase-row {
  display: grid;
  grid-template-columns: 44px minmax(220px, 1fr) minmax(260px, .9fr) auto;
  gap: 14px;
  align-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  padding: 14px;
}

.phrase-row {
  grid-template-columns: 44px minmax(0, 1fr) auto;
}

.row-index {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #eaf1ff;
  color: var(--primary-dark);
  border-radius: 9px;
  font-weight: 900;
}

.vocab-row h3,
.phrase-row h3 {
  margin: 0 0 4px;
  font-size: 20px;
}

.vocab-row p,
.phrase-row p {
  margin: 4px 0;
  color: #475467;
}

.vocab-row small {
  color: var(--primary-dark);
  font-weight: 900;
}

.row-example {
  color: #344054;
  font-weight: 700;
}

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

.usage-card {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  padding: 16px;
}

.usage-card h3 {
  margin: 0 0 8px;
}

.usage-card p {
  margin: 0;
  color: #475467;
}

.usage-note {
  margin-top: 14px;
  border: 1px solid #bfdbfe;
  background: #eef4ff;
  color: var(--primary-dark);
  border-radius: 10px;
  padding: 14px;
}

.dialogue-lessons {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

.dialogue-lesson {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 12px;
  padding: 16px;
}

.dialogue-lesson-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  margin-bottom: 12px;
}

.dialogue-lesson h3 {
  margin: 0 0 6px;
}

.dialogue-lesson-head p {
  margin: 0;
  color: var(--muted);
}

.sample-dialogue {
  display: grid;
  gap: 8px;
}

.memory-list {
  display: grid;
  gap: 10px;
  padding-left: 0;
  counter-reset: memory;
}

.memory-list li {
  list-style: none;
  counter-increment: memory;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  padding: 13px;
  color: #344054;
  font-weight: 700;
}

.memory-list li::before {
  content: counter(memory);
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #111827;
  color: #ffffff;
  border-radius: 9px;
  font-weight: 900;
}

.memory-command-list {
  display: grid;
  gap: 12px;
}

.memory-command {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  align-items: start;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 12px;
  padding: 16px;
}

.memory-command h3 {
  margin: 0 0 8px;
}

.memory-command p {
  margin: 0 0 8px;
  color: #344054;
}

.memory-command small {
  display: block;
  color: var(--primary-dark);
  font-weight: 900;
}

.practice-part {
  border-top: 1px solid var(--border);
  padding-top: 18px;
  margin-top: 22px;
}

.practice-part:first-of-type {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.practice-part h3 {
  margin: 0 0 12px;
  font-size: 22px;
}

.lesson-exam {
  display: grid;
  gap: 18px;
}

.exam-overview,
.exam-result {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, .045);
}

.exam-overview h3,
.exam-result h3 {
  margin: 0 0 6px;
}

.exam-overview p,
.exam-result p {
  margin: 0;
  color: var(--muted);
}

.exam-pass-box {
  min-width: 120px;
  border: 1px solid #c7d7fe;
  background: #eff6ff;
  border-radius: 12px;
  padding: 14px;
  text-align: center;
}

.exam-pass-box b {
  display: block;
  color: var(--primary-dark);
  font-size: 28px;
  line-height: 1;
}

.exam-pass-box span {
  color: #475467;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.exam-result {
  display: block;
  border-left: 5px solid var(--primary);
}

.exam-result.passed {
  border-left-color: var(--success);
}

.exam-result.failed {
  border-left-color: var(--danger);
}

.exam-result-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 14px;
}

.exam-result-head span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.exam-score-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}

.exam-section-score {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  padding: 12px;
}

.exam-section-score span,
.exam-section-score small {
  display: block;
  color: var(--muted);
  font-weight: 800;
}

.exam-section-score b {
  display: block;
  margin: 4px 0;
  font-size: 20px;
}

.exam-question.is-correct {
  border-color: #9ae6b4;
  background: #f0fdf4;
}

.exam-question.is-wrong {
  border-color: #fecaca;
  background: #fff7f7;
}

textarea.is-correct {
  border-color: #16a34a;
}

textarea.is-wrong {
  border-color: #dc2626;
}

.exam-submit-bar {
  position: sticky;
  bottom: 0;
  z-index: 4;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(10px);
  border-radius: 14px;
  padding: 12px;
  box-shadow: 0 -8px 24px rgba(15, 23, 42, .06);
}

.progress-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 20px 0;
}

.progress-summary div,
.progress-card,
.empty-progress {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, .045);
}

.progress-summary span {
  display: block;
  color: var(--muted);
  font-weight: 800;
  font-size: 13px;
}

.progress-summary b {
  display: block;
  margin-top: 8px;
  font-size: 28px;
}

.progress-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.progress-list {
  display: grid;
  gap: 12px;
}

.progress-card {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.progress-card h3 {
  margin: 0 0 6px;
}

.progress-score {
  margin: 4px 0 8px;
  font-weight: 900;
}

.progress-score.passed {
  color: var(--success);
}

.progress-score.failed {
  color: var(--danger);
}

.progress-card p {
  margin: 0 0 10px;
  color: var(--muted);
  font-weight: 800;
}

.progress-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.progress-tags span {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
  border-radius: 7px;
  padding: 6px 8px;
  font-weight: 800;
  font-size: 13px;
}

.empty-progress {
  color: var(--muted);
  font-weight: 800;
}

.auth-page,
.account-page {
  padding: 42px 0 56px;
}

.auth-card,
.account-section,
.account-panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, .055);
}

.auth-card {
  width: min(560px, 100%);
  margin: 0 auto;
  padding: 28px;
}

.auth-card.wide {
  width: min(760px, 100%);
}

.account-form {
  display: grid;
  gap: 12px;
}

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

.account-form .full-row {
  grid-column: 1 / -1;
}

.account-form input,
.account-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 13px 14px;
  font: inherit;
  background: #fff;
}

.form-alert {
  border-radius: 10px;
  padding: 12px 14px;
  margin: 14px 0;
  font-weight: 800;
}

.form-alert.error {
  border: 1px solid #fecaca;
  background: #fff1f2;
  color: #991b1b;
}

.form-alert.success {
  border: 1px solid #bbf7d0;
  background: #f0fdf4;
  color: #166534;
}

.auth-switch {
  margin: 18px 0 0;
  color: var(--muted);
  font-weight: 800;
}

.auth-switch a {
  color: var(--primary);
}

.account-layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.account-panel {
  position: sticky;
  top: 78px;
  padding: 22px;
}

.account-avatar {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 26px;
  font-weight: 900;
}

.account-panel h2 {
  margin: 14px 0 4px;
}

.account-panel p {
  color: var(--muted);
  margin: 0 0 14px;
  word-break: break-word;
}

.account-meta {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
}

.account-meta span {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 8px 10px;
  color: #475467;
  font-weight: 800;
}

.account-sections {
  display: grid;
  gap: 16px;
}

.account-section {
  padding: 22px;
}

.account-section h2 {
  margin: 0 0 14px;
}

@media (max-width: 1080px) {
  .lesson-page-nav {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    position: static;
  }

  .vocab-row {
    grid-template-columns: 44px 1fr;
  }

  .row-example {
    grid-column: 2;
  }

  .phrase-row,
  .usage-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .account-layout,
  .account-grid-form {
    grid-template-columns: 1fr;
  }

  .account-panel {
    position: static;
  }

  .exam-overview,
  .exam-result-head {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .exam-submit-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .lesson-page-nav {
    grid-template-columns: 1fr;
  }

  .page-heading {
    display: block;
  }

  .page-heading .btn {
    margin-top: 12px;
  }

  .progress-summary,
  .progress-card {
    grid-template-columns: 1fr;
    display: grid;
  }

  .vocab-row {
    grid-template-columns: 1fr;
  }

  .row-example {
    grid-column: auto;
  }
}