:root {
  --bg: #071018;
  --bg-soft: #0d1822;
  --card: rgba(15, 27, 38, 0.92);
  --card-hover: rgba(18, 33, 46, 0.98);

  --text: #f5f1e8;
  --text-soft: #b9c1c8;
  --text-muted: #7f8b96;

  --gold: #d6b56c;
  --gold-light: #f1d590;
  --gold-dark: #9f7d3e;

  --border: rgba(214, 181, 108, 0.18);
  --border-strong: rgba(214, 181, 108, 0.45);

  --container: 1180px;
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;

  background:
    radial-gradient(
      circle at top center,
      rgba(214, 181, 108, 0.08),
      transparent 34%
    ),
    linear-gradient(180deg, #08121b 0%, #050b11 100%);

  color: var(--text);
  font-family: "Inter", sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.container {
  width: min(calc(100% - 40px), var(--container));
  margin: 0 auto;
}

/* HERO */

.lessons-hero {
  padding: 72px 0 42px;
}

.lessons-hero-inner {
  max-width: 850px;
}

.back-link {
  display: inline-flex;
  align-items: center;

  margin-bottom: 60px;
  
  color: var(--gold-dark);
  font-size: 30px;
  font-weight: 600;
  text-decoration: none;

  transition:
    color 0.2s ease,
    transform 0.2s ease;
}

.back-link:hover {
  color: var(--gold-light);
  transform: translateX(-3px);
}

.eyebrow {
  margin: 0 0 20px;

  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.lessons-hero h1 {
  margin: 0;

  font-family: "Playfair Display", serif;
  font-size: clamp(52px, 7vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.04em;

  color: var(--text);
}

.hero-lead {
  max-width: 720px;

  margin: 30px 0 0;

  color: var(--text-soft);
  font-size: 19px;
  line-height: 1.75;
}

.hero-divider {
  width: 100%;
  height: 1px;

  margin: 52px 0 24px;

  background: linear-gradient(
    90deg,
    var(--gold-dark),
    rgba(214, 181, 108, 0.15),
    transparent
  );
}

.hero-hint {
  margin: 0;

  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* CARDS */

.lesson-options {
  padding: 28px 0 100px;
}

.lesson-options-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.lesson-card {
  position: relative;
  overflow: hidden;

  display: flex;
  flex-direction: column;

  min-height: 470px;
  padding: 38px;

  border: 1px solid var(--border);
  border-radius: var(--radius);

  background:
    linear-gradient(
      145deg,
      rgba(255, 255, 255, 0.015),
      transparent 45%
    ),
    var(--card);

  box-shadow:
    0 20px 50px rgba(0, 0, 0, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.025);

  transition:
    transform 0.3s ease,
    border-color 0.3s ease,
    background 0.3s ease,
    box-shadow 0.3s ease;
}

.lesson-card::before {
  content: "";

  position: absolute;
  top: -100px;
  right: -100px;

  width: 240px;
  height: 240px;

  border-radius: 50%;

  background: radial-gradient(
    circle,
    rgba(214, 181, 108, 0.08),
    transparent 68%
  );

  pointer-events: none;
}

.lesson-card:hover {
  transform: translateY(-7px);

  border-color: var(--border-strong);

  background:
    linear-gradient(
      145deg,
      rgba(214, 181, 108, 0.035),
      transparent 45%
    ),
    var(--card-hover);

  box-shadow:
    0 26px 70px rgba(0, 0, 0, 0.25),
    0 0 0 1px rgba(214, 181, 108, 0.03);
}

.lesson-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;

  margin-bottom: 48px;
}

.lesson-card-number {
  font-family: "Playfair Display", serif;
  color: var(--gold-dark);
  font-size: 18px;
}

.lesson-card-label {
  margin: 0;

  color: var(--gold);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.lesson-card h2 {
  max-width: 480px;

  margin: 0 0 22px;

  font-family: "Playfair Display", serif;
  font-size: clamp(30px, 3vw, 42px);
  line-height: 1.1;

  color: var(--text);
}

.lesson-card-text {
  max-width: 520px;

  margin: 0 0 34px;

  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.75;
}

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

  margin-top: auto;
}

.lesson-link {
  display: flex;
  align-items: center;
  justify-content: space-between;

  min-height: 56px;
  padding: 0 18px;

  border-radius: 14px;

  font-size: 14px;
  font-weight: 700;
  text-decoration: none;

  transition:
    transform 0.2s ease,
    background 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease;
}

.lesson-link span {
  font-size: 18px;
  transition: transform 0.2s ease;
}

.lesson-link:hover span {
  transform: translateX(4px);
}

.lesson-link-primary {
  background: linear-gradient(
    135deg,
    var(--gold-light),
    var(--gold)
  );

  color: #16120a;

  border: 1px solid transparent;
}

.lesson-link-primary:hover {
  transform: translateY(-2px);

  background: linear-gradient(
    135deg,
    #f7dfa5,
    #dfbf75
  );
}

.lesson-link-secondary {
  background: rgba(255, 255, 255, 0.015);

  border: 1px solid var(--border);

  color: var(--text);
}

.lesson-link-secondary:hover {
  transform: translateY(-2px);

  border-color: var(--border-strong);

  color: var(--gold-light);

  background: rgba(214, 181, 108, 0.04);
}

/* RESPONSIVE */

@media (max-width: 900px) {
  .lessons-hero {
    padding-top: 48px;
  }

  .back-link {
    margin-bottom: 44px;
  }

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

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

@media (max-width: 620px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .lessons-hero {
    padding: 34px 0 26px;
  }

  .back-link {
    margin-bottom: 34px;
  }

  .eyebrow {
    font-size: 11px;
    line-height: 1.5;
  }

  .lessons-hero h1 {
    font-size: clamp(42px, 13vw, 62px);
  }

  .hero-lead {
    margin-top: 24px;
    font-size: 16px;
  }

  .hero-divider {
    margin-top: 38px;
  }

  .lesson-options {
    padding: 18px 0 60px;
  }

  .lesson-card {
    padding: 26px 22px;
    border-radius: 20px;
  }

  .lesson-card-top {
    margin-bottom: 34px;
  }

  .lesson-card h2 {
    font-size: 31px;
  }

  .lesson-card-text {
    font-size: 15px;
  }

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