:root {
  --bg: #f4f8ff;
  --bg-2: #eaf2ff;
  --text: #19345c;
  --muted: #6f84a7;
  --line: rgba(79, 140, 255, 0.12);
  --line-strong: rgba(79, 140, 255, 0.24);
  --blue: #4f8cff;
  --green: #28c76f;
  --pink: #ff66c7;
  --orange: #ffb545;
  --purple: #8b6dff;
  --yellow: #ffd84d;
  --shadow: 0 20px 48px rgba(59, 102, 193, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Heebo", sans-serif;
  background:
    radial-gradient(circle at 8% 10%, rgba(255, 102, 199, 0.14), transparent 18%),
    radial-gradient(circle at 92% 14%, rgba(79, 140, 255, 0.18), transparent 18%),
    radial-gradient(circle at 15% 86%, rgba(40, 199, 111, 0.12), transparent 16%),
    radial-gradient(circle at 86% 78%, rgba(255, 181, 69, 0.16), transparent 18%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

button,
a,
input {
  font-family: inherit;
}

.bg-orb {
  position: fixed;
  border-radius: 999px;
  filter: blur(18px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

.orb-1 {
  width: 250px;
  height: 250px;
  top: 80px;
  right: -60px;
  background: radial-gradient(circle, rgba(79, 140, 255, 0.42), transparent 72%);
}

.orb-2 {
  width: 220px;
  height: 220px;
  bottom: 80px;
  left: -50px;
  background: radial-gradient(circle, rgba(255, 102, 199, 0.30), transparent 72%);
}

.orb-3 {
  width: 210px;
  height: 210px;
  top: 46%;
  left: 16%;
  background: radial-gradient(circle, rgba(40, 199, 111, 0.24), transparent 72%);
}

.grid-glow {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(79, 140, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 140, 255, 0.03) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at center, black 32%, transparent 82%);
  pointer-events: none;
  z-index: 0;
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1240px, calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 40px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(255,255,255,0.84);
  backdrop-filter: blur(14px);
  border-radius: 24px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 14px;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-logo {
  width: 58px;
  height: 58px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, #4f8cff, #8b6dff, #ff66c7);
  box-shadow: 0 12px 24px rgba(79, 140, 255, 0.24);
}

.brand-text h1 {
  margin: 0;
  font-size: 1.18rem;
}

.brand-text p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.nav-link {
  text-decoration: none;
  color: var(--text);
  background: rgba(255,255,255,0.62);
  border: 1px solid var(--line);
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 800;
  transition: 0.18s ease;
}

.nav-link:hover,
.nav-link.active {
  color: white;
  border-color: transparent;
  background: linear-gradient(135deg, #4f8cff, #8b6dff);
  box-shadow: 0 10px 22px rgba(79, 140, 255, 0.20);
}

.hero {
  margin-top: 22px;
}

.hero-bright {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 22px;
  min-height: 500px;
  padding: 34px;
  background:
    linear-gradient(135deg, rgba(79,140,255,0.16), rgba(139,109,255,0.12), rgba(255,102,199,0.10)),
    rgba(255,255,255,0.56);
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: 40px;
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}

.hero-bright::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 88% 14%, rgba(79,140,255,0.18), transparent 24%),
    radial-gradient(circle at 16% 82%, rgba(255,102,199,0.10), transparent 22%);
  pointer-events: none;
}

.hero-left,
.hero-right {
  position: relative;
  z-index: 1;
}

.hero-left {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-badge {
  display: inline-flex;
  align-self: flex-start;
  padding: 9px 15px;
  border-radius: 999px;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(79,140,255,0.10);
  color: #3f69b5;
  font-weight: 800;
  margin-bottom: 18px;
}

.hero-bright h2 {
  margin: 0 0 16px;
  font-size: clamp(2.35rem, 5vw, 4.7rem);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -1px;
}

.hero-bright h2 span {
  display: block;
  background: linear-gradient(90deg, #4f8cff, #8b6dff, #ff66c7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

.hero-description {
  margin: 0;
  max-width: 680px;
  color: #56719e;
  font-size: 1.08rem;
  line-height: 1.95;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.primary-btn,
.secondary-btn,
.bottom-back-link,
.lesson-next-link {
  border: none;
  border-radius: 999px;
  padding: 15px 24px;
  font-size: 1rem;
  font-weight: 900;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.primary-btn,
.lesson-next-link {
  color: white;
  background: linear-gradient(135deg, #4f8cff, #8b6dff);
  box-shadow: 0 16px 32px rgba(79, 140, 255, 0.24);
}

.secondary-btn,
.bottom-back-link {
  color: var(--text);
  background: rgba(255,255,255,0.72);
  border: 1px solid var(--line);
}

.primary-btn:hover,
.secondary-btn:hover,
.bottom-back-link:hover,
.lesson-next-link:hover,
.subject-link-card:hover,
.answer-option:hover,
.mission-node-card:hover:not(.mission-locked),
.grade-link-card:hover {
  transform: translateY(-3px);
}

.hero-mini-stats {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  max-width: 720px;
}

.mini-stat {
  padding: 18px;
  border-radius: 24px;
  background: rgba(255,255,255,0.68);
  border: 1px solid rgba(79,140,255,0.08);
}

.mini-stat strong {
  display: block;
  font-size: 1.55rem;
  margin-bottom: 4px;
}

.mini-stat span {
  color: var(--muted);
  font-size: 0.95rem;
}

.hero-right {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-showcase-card {
  width: min(100%, 430px);
  padding: 24px;
  border-radius: 30px;
  background: linear-gradient(180deg, rgba(255,255,255,0.82), rgba(255,255,255,0.62));
  border: 1px solid rgba(255,255,255,0.76);
  box-shadow: var(--shadow);
}

.showcase-pill-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.showcase-pill {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(79,140,255,0.12);
  color: #3f69b5;
  font-weight: 800;
  font-size: 0.88rem;
}

.showcase-pill-green {
  background: rgba(40,199,111,0.12);
  color: #208b51;
}

.hero-showcase-card h3 {
  margin: 0 0 10px;
  font-size: 1.7rem;
}

.hero-showcase-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.showcase-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.showcase-box {
  padding: 16px;
  border-radius: 20px;
  color: white;
  font-weight: 900;
  text-align: center;
}

.showcase-blue { background: linear-gradient(135deg, #4f8cff, #79abff); }
.showcase-green { background: linear-gradient(135deg, #28c76f, #5fe29a); }
.showcase-pink { background: linear-gradient(135deg, #ff66c7, #ff96db); }
.showcase-orange { background: linear-gradient(135deg, #ffb545, #ffd164); }

.showcase-track {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 22px;
}

.showcase-step {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-weight: 900;
  color: white;
}

.showcase-step.done { background: linear-gradient(135deg, #28c76f, #51de8d); }
.showcase-step.current { background: linear-gradient(135deg, #4f8cff, #8b6dff); }
.showcase-step.locked { background: #c7d4ea; color: #6f84a7; }

.showcase-line {
  width: 44px;
  height: 8px;
  border-radius: 999px;
  background: #d6e0f2;
  margin: 0 8px;
}

.showcase-line.active {
  background: linear-gradient(90deg, #28c76f, #4f8cff);
}

.section-head {
  margin-top: 34px;
  margin-bottom: 18px;
}

.section-head-strong h3,
.side-card h3,
.lesson-content-card h3,
.lesson-side-card h3 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.section-head p,
.side-card p,
.lesson-content-card p,
.lesson-side-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.section-mini {
  display: inline-block;
  color: #3f69b5;
  background: rgba(79,140,255,0.10);
  border: 1px solid rgba(79,140,255,0.14);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 0.88rem;
  font-weight: 900;
  margin-bottom: 8px;
}

.feature-strip {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.feature-pill {
  padding: 12px 16px;
  border-radius: 999px;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(79,140,255,0.10);
  color: #3f69b5;
  font-weight: 800;
}

.grades-grid,
.subjects-grid {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.grades-grid {
  grid-template-columns: repeat(4, 1fr);
}

.subjects-grid {
  grid-template-columns: repeat(4, 1fr);
}

.grade-card,
.subject-card,
.lesson-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.84), rgba(255,255,255,0.66));
  border: 1px solid rgba(79,140,255,0.10);
  border-radius: 28px;
  padding: 20px;
  text-align: right;
  box-shadow: var(--shadow);
  color: var(--text);
  transition: 0.2s ease;
}

.grade-link-card,
.subject-link-card {
  text-decoration: none;
  display: block;
  cursor: pointer;
}

.grade-card-top,
.subject-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 12px;
}

.grade-icon,
.subject-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  font-weight: 900;
  color: white;
  background: linear-gradient(135deg, #4f8cff, #8b6dff, #ff66c7);
}

.grade-icon {
  font-size: 1.15rem;
}

.subject-icon {
  font-size: 1.45rem;
}

.grade-badge,
.subject-tag {
  font-size: 0.8rem;
  font-weight: 800;
  color: #446fb9;
  background: rgba(79,140,255,0.08);
  border: 1px solid rgba(79,140,255,0.12);
  padding: 7px 10px;
  border-radius: 999px;
}

.grade-card h4,
.subject-card h4,
.lesson-card h4 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.grade-card p,
.subject-card p,
.lesson-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.grade-card-active-home,
.subject-card.active {
  background: linear-gradient(135deg, rgba(79,140,255,0.16), rgba(139,109,255,0.12), rgba(255,102,199,0.08));
  border-color: rgba(79,140,255,0.18);
}

.grade-card-soon {
  opacity: 0.92;
}

.grade-card-premium-home {
  background: linear-gradient(135deg, rgba(255,181,69,0.18), rgba(255,102,199,0.08));
}

.grade-card-premium-home .grade-badge {
  background: rgba(255,181,69,0.14);
  color: #b67100;
}

.subject-card-disabled {
  opacity: 0.75;
}

.subject-enter-link {
  display: inline-flex;
  margin-top: 16px;
  font-weight: 800;
  color: #446fb9;
}

.subject-enter-disabled {
  color: #8297b8;
}

.map-section {
  margin-top: 20px;
}

.mission-path {
  position: relative;
  padding: 18px 0;
}

.mission-path::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 50%;
  transform: translateX(50%);
  width: 12px;
  border-radius: 999px;
  background: repeating-linear-gradient(
    to bottom,
    rgba(79,140,255,0.26) 0 36px,
    rgba(139,109,255,0.22) 36px 62px,
    rgba(255,102,199,0.20) 62px 90px
  );
}

.mission-row {
  position: relative;
  min-height: 170px;
  display: grid;
  grid-template-columns: 1fr 90px 1fr;
  align-items: center;
}

.mission-row-left .mission-node-wrap {
  grid-column: 1;
}

.mission-row-right .mission-node-wrap {
  grid-column: 3;
}

.mission-node-wrap {
  display: flex;
}

.mission-row-left .mission-node-wrap {
  justify-content: flex-end;
  padding-left: 20px;
}

.mission-row-right .mission-node-wrap {
  justify-content: flex-start;
  padding-right: 20px;
}

.mission-node-card {
  width: min(100%, 350px);
  min-height: 140px;
  padding: 22px;
  border-radius: 30px;
  border: 1px solid rgba(79,140,255,0.10);
  background: linear-gradient(180deg, rgba(255,255,255,0.88), rgba(255,255,255,0.68));
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: 0.2s ease;
}

.mission-node-card strong {
  display: block;
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.mission-node-card p {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.7;
}

.mission-pill {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 800;
}

.mission-open {
  background: linear-gradient(135deg, rgba(79,140,255,0.16), rgba(139,109,255,0.10), rgba(255,255,255,0.76));
  border-color: rgba(79,140,255,0.20);
}

.mission-open .mission-pill {
  background: rgba(79,140,255,0.12);
  color: #446fb9;
}

.mission-current {
  box-shadow: 0 0 0 4px rgba(79,140,255,0.18), var(--shadow);
}

.mission-completed {
  background: linear-gradient(135deg, rgba(40,199,111,0.16), rgba(79,140,255,0.10), rgba(255,255,255,0.74));
  border-color: rgba(40,199,111,0.20);
}

.mission-completed .mission-pill {
  background: rgba(40,199,111,0.12);
  color: #208b51;
}

.mission-locked {
  background: rgba(255,255,255,0.56);
  color: #899cba;
  border-color: rgba(79,140,255,0.06);
  cursor: not-allowed;
  box-shadow: none;
}

.mission-locked p {
  color: #899cba;
}

.mission-locked .mission-pill {
  background: rgba(79,140,255,0.08);
  color: #899cba;
}

.mission-center-badge {
  grid-column: 2;
  justify-self: center;
  width: 68px;
  height: 68px;
  border-radius: 24px;
  display: grid;
  place-items: center;
  font-size: 1.05rem;
  font-weight: 900;
  color: white;
  border: 1px solid rgba(255,255,255,0.72);
  box-shadow: 0 12px 24px rgba(79, 140, 255, 0.14);
}

.mission-center-open {
  background: linear-gradient(135deg, #4f8cff, #8b6dff);
}

.mission-center-completed {
  background: linear-gradient(135deg, #28c76f, #4f8cff);
}

.mission-center-locked {
  background: #d6e0f2;
  color: #7389ad;
}

.lesson-page-layout {
  margin-top: 20px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  align-items: start;
}

.lesson-content-card,
.lesson-side-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.84), rgba(255,255,255,0.66));
  border: 1px solid rgba(79,140,255,0.10);
  border-radius: 32px;
  box-shadow: var(--shadow);
  padding: 24px;
}

.lesson-panel-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.progress-box {
  min-width: 130px;
  border-radius: 20px;
  padding: 14px;
  text-align: center;
  background: rgba(79,140,255,0.06);
  border: 1px solid rgba(79,140,255,0.10);
}

.progress-box span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.progress-box strong {
  font-size: 1.2rem;
  color: var(--text);
}

.quiz-container {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.question-card {
  padding: 20px;
  border-radius: 24px;
  background: rgba(79,140,255,0.04);
  border: 1px solid rgba(79,140,255,0.10);
}

.question-top {
  margin-bottom: 14px;
}

.question-badge {
  display: inline-block;
  margin-bottom: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 800;
  background: rgba(79,140,255,0.10);
  border: 1px solid rgba(79,140,255,0.14);
  color: #446fb9;
}

.question-card h4 {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.6;
}

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

.answer-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255,255,255,0.76);
  border: 1px solid rgba(79,140,255,0.10);
  cursor: pointer;
  transition: 0.18s ease;
}

.answer-option input {
  accent-color: var(--blue);
  transform: scale(1.15);
}

.answer-option span {
  font-weight: 700;
}

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

.feedback-box {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 20px;
  font-weight: 800;
}

.feedback-success {
  background: rgba(40,199,111,0.14);
  border: 1px solid rgba(40,199,111,0.20);
  color: #208b51;
}

.feedback-error {
  background: rgba(255,107,107,0.14);
  border: 1px solid rgba(255,107,107,0.20);
  color: #b33d3d;
}

.feedback-info {
  background: rgba(79,140,255,0.14);
  border: 1px solid rgba(79,140,255,0.20);
  color: #446fb9;
}

.hidden {
  display: none;
}

.lesson-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.lesson-list-item {
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(79,140,255,0.10);
  background: rgba(255,255,255,0.70);
}

.lesson-list-item strong {
  display: block;
  margin-bottom: 4px;
}

.lesson-list-item small {
  color: var(--muted);
}

.lesson-list-item.active {
  background: linear-gradient(135deg, rgba(79,140,255,0.16), rgba(139,109,255,0.10));
}

.lesson-list-item.done {
  background: linear-gradient(135deg, rgba(40,199,111,0.16), rgba(79,140,255,0.08));
}

.bottom-back-row {
  margin-top: 22px;
  display: flex;
  justify-content: center;
}

@media (max-width: 1100px) {
  .hero-bright,
  .lesson-page-layout {
    grid-template-columns: 1fr;
  }

  .subjects-grid,
  .grades-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .mission-row {
    grid-template-columns: 1fr;
    min-height: auto;
    margin-bottom: 20px;
  }

  .mission-path::before {
    display: none;
  }

  .mission-node-wrap,
  .mission-row-left .mission-node-wrap,
  .mission-row-right .mission-node-wrap {
    grid-column: 1;
    justify-content: stretch;
    padding: 0;
  }

  .mission-center-badge {
    display: none;
  }

  .lesson-panel-head {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 18px, 1000px);
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .brand {
    justify-content: center;
    text-align: center;
  }

  .top-nav {
    justify-content: center;
  }

  .hero-bright,
  .lesson-content-card,
  .lesson-side-card {
    padding: 20px;
    border-radius: 24px;
  }

  .hero-mini-stats,
  .subjects-grid,
  .grades-grid,
  .showcase-grid {
    grid-template-columns: 1fr;
  }

  .hero-bright h2 {
    font-size: 2.35rem;
  }

  .mission-node-card {
    width: 100%;
  }
}