:root {
  --primary: #336699;
  --secondary: #99CC33;
  --text: #000000;
  --muted: #5b6674;
  --line: #dce5ee;
  --soft: #f4f8fb;
  --ink-soft: #1f3448;
  --success: #2f7d32;
  --danger: #9f2d20;
  --shadow: 0 18px 44px rgba(23, 54, 86, 0.12);
}

@font-face {
  font-family: "Besknees";
  src: local("Besknees");
  font-display: swap;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #fff;
  color: var(--text);
  font-family: Verdana, Arial, sans-serif;
  line-height: 1.55;
}

a {
  color: var(--primary);
}

h1,
h2,
h3,
.brand {
  font-family: "Besknees", Verdana, Arial, sans-serif;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.02;
}

h2 {
  margin-bottom: 8px;
  font-size: clamp(28px, 4vw, 44px);
}

h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

button,
input {
  font: inherit;
}

input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--ink-soft);
  font-weight: 800;
}

main,
.app-header,
footer {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
}

.brand {
  color: var(--primary);
  font-size: 29px;
  font-weight: 900;
  text-decoration: none;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  margin-left: auto;
}

.top-nav a {
  color: var(--text);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

main {
  padding: 34px 0 76px;
}

footer {
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.hero-band {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 28px;
  align-items: center;
  min-height: 560px;
}

.lead {
  max-width: 720px;
  color: var(--muted);
  font-size: 18px;
}

.eyebrow {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.auth-card,
.panel,
.lesson-card,
.exercise-card,
.course-card,
.stat-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.auth-card,
.panel,
.lesson-card,
.exercise-card,
.course-card,
.stat-card {
  padding: 22px;
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
}

.tab,
.ghost-button,
.primary-button,
.option-button {
  min-height: 44px;
  border-radius: 8px;
  font-weight: 900;
  cursor: pointer;
}

.tab {
  border: 1px solid var(--line);
  background: var(--soft);
  color: var(--ink-soft);
}

.tab.is-active,
.primary-button {
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
}

.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 15px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--primary);
  text-decoration: none;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 17px;
  text-decoration: none;
}

.auth-form {
  display: grid;
  gap: 14px;
}

.status-message {
  min-height: 24px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.section-block {
  padding: 38px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: end;
  margin-bottom: 20px;
}

.muted {
  color: var(--muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.stat-card strong {
  display: block;
  color: var(--primary);
  font-size: 34px;
  line-height: 1;
}

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

.dashboard-grid,
.certificate-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

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

.progress-bars {
  display: grid;
  gap: 10px;
}

.progress-row {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.bar {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--soft);
}

.bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--secondary);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.course-card {
  display: grid;
  gap: 12px;
}

.course-card.is-complete {
  border-color: var(--secondary);
  background: #fbfff4;
}

.course-card.is-locked {
  background: #f8fafc;
}

.course-title-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}

.course-title-row h3 {
  margin-bottom: 6px;
}

.course-status {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  white-space: nowrap;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.course-status.complete {
  background: #e7f6d5;
  color: #2f6f16;
}

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

.course-progress {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--soft);
}

.course-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--secondary);
}

.course-note,
.course-action-message {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.course-action-message {
  min-height: 22px;
  color: var(--primary);
  font-weight: 800;
}

.pill {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 900;
}

.pill.free {
  background: #eef8dc;
}

.pill.pro {
  background: #eaf2fb;
}

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

.lesson-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.lesson-row.is-complete {
  border-color: var(--secondary);
  background: #fbfff4;
}

.lesson-row h3,
.lesson-row p {
  margin-bottom: 4px;
}

.lesson-title-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}

.lesson-status {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  white-space: nowrap;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.lesson-status.complete {
  background: #e7f6d5;
  color: #2f6f16;
}

.lesson-xp-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.lesson-xp-row span,
.quiz-earned {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 900;
}

.quiz-earned {
  width: fit-content;
  margin: 10px 0 0;
  background: #e7f6d5;
  color: #2f6f16;
}

.lesson-content {
  display: grid;
  gap: 16px;
}

.lesson-flow-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 18px;
  border: 1px solid var(--secondary);
  border-radius: 8px;
  background: #fbfff4;
}

.lesson-flow-actions[hidden] {
  display: none;
}

.flow-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.objective-list,
.takeaway-list {
  display: grid;
  gap: 8px;
  padding-left: 18px;
}

.callout {
  padding: 16px;
  border-left: 5px solid var(--secondary);
  background: var(--soft);
}

.exercise-card {
  margin-top: 18px;
}

.exercise-stack {
  display: grid;
  gap: 16px;
}

.exercise-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.exercise-item h4 {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-size: 18px;
}

.prompt-school-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 16px 0;
}

.prompt-school-grid label:nth-child(3) {
  grid-column: 1 / -1;
}

.prompt-preview {
  white-space: pre-wrap;
  margin: 14px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 700;
}

.prompt-sentence {
  padding: 16px;
  border-radius: 8px;
  background: var(--soft);
  color: var(--ink-soft);
  font-weight: 900;
}

.option-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0;
}

.option-button {
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
}

.option-button.is-selected {
  border-color: var(--secondary);
  background: #eef8dc;
}

.feedback {
  padding: 14px;
  border-radius: 8px;
  background: var(--soft);
}

.feedback.correct {
  border-left: 5px solid var(--success);
}

.feedback.wrong {
  border-left: 5px solid var(--danger);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.tool-grid a {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  color: var(--primary);
  font-weight: 900;
  text-decoration: none;
}

.inline-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.certificate-result {
  margin-top: 16px;
}

.certificate-code {
  display: inline-block;
  margin: 10px 0;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--soft);
  font-weight: 900;
}

.text-link {
  font-weight: 900;
}

@media (max-width: 900px) {
  .app-header,
  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    margin-left: 0;
  }

  .hero-band,
  .stats-grid,
  .dashboard-grid,
  .course-grid,
  .certificate-grid,
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .lesson-row,
  .inline-form {
    grid-template-columns: 1fr;
  }
}