:root {
  --navy: #07111f;
  --navy-soft: #0d1a2b;
  --gold: #d8aa3d;
  --gold-bright: #f1c55b;
  --cream: #f3ead7;
  --white: #ffffff;
  --muted: #b7c0cc;
  --line: rgba(216, 170, 61, 0.35);
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--cream);
  background:
    radial-gradient(
      circle at top,
      rgba(35, 62, 94, 0.35),
      transparent 42%
    ),
    var(--navy);
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

.container {
  width: min(92%, var(--max-width));
  margin: 0 auto;
}

.narrow {
  max-width: 760px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7, 17, 31, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.nav-wrap {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  text-decoration: none;
  color: var(--gold-bright);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.site-nav a {
  text-decoration: none;
  color: var(--cream);
  font-weight: 700;
}

.site-nav a:hover {
  color: var(--gold-bright);
}

.hero {
  padding: 92px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold-bright);
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2 {
  margin-top: 0;
  line-height: 1.08;
}

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(3rem, 7vw, 6.4rem);
  text-transform: uppercase;
  color: var(--gold-bright);
  letter-spacing: 0.02em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  color: var(--gold-bright);
}

.hero-lead {
  max-width: 700px;
  margin: 0 0 32px;
  color: var(--cream);
  font-size: 1.2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-block;
  padding: 14px 22px;
  border: 1px solid var(--gold);
  border-radius: 5px;
  text-decoration: none;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.button-primary {
  background: var(--gold);
  color: var(--navy);
}

.button-primary:hover {
  background: var(--gold-bright);
}

.button-secondary {
  background: transparent;
  color: var(--gold-bright);
}

.button-secondary:hover {
  background: rgba(216, 170, 61, 0.1);
}

.cover-placeholder {
  min-height: 540px;
  display: grid;
  place-items: center;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  background:
    linear-gradient(
      145deg,
      rgba(216, 170, 61, 0.12),
      rgba(13, 26, 43, 0.94)
    );
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.38);
  text-align: center;
}

.stats {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.stat-card {
  padding: 32px 20px;
  text-align: center;
}

.stat-card + .stat-card {
  border-left: 1px solid var(--line);
}

.stat-card strong {
  display: block;
  color: var(--gold-bright);
  font-size: 2.2rem;
}

.stat-card span {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.section {
  padding: 84px 0;
}

.section p {
  color: var(--muted);
  font-size: 1.08rem;
}

.section-dark {
  background: var(--navy-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.site-footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  background: #040a12;
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-wrap p {
  margin: 0;
}

.footer-wrap a {
  color: var(--gold-bright);
}

@media (max-width: 820px) {
  .nav-wrap,
  .footer-wrap,
  .callout {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .site-nav {
    gap: 14px;
  }

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

  .stat-card + .stat-card {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .cover-placeholder {
    min-height: 420px;
  }
}

.book-cover{
    width:100%;
    max-width:480px;
    border-radius:10px;

    box-shadow:
        0 20px 70px rgba(0,0,0,.45);

    transition:.35s;
}

.book-cover:hover{

    transform:translateY(-6px);

    box-shadow:
        0 35px 90px rgba(0,0,0,.60);

}

/* ==========================================================
   SOLUTION VERIFICATION PAGE
   ========================================================== */

.verify-hero {
  min-height: calc(100vh - 150px);
  padding: 86px 0;
  background:
    radial-gradient(
      circle at top,
      rgba(216, 170, 61, 0.12),
      transparent 38%
    ),
    linear-gradient(
      180deg,
      #091727 0%,
      #050c15 100%
    );
}

.verify-container {
  max-width: 820px;
  text-align: center;
}

.verify-title {
  max-width: none;
  margin-bottom: 22px;
  font-size: clamp(2.7rem, 7vw, 5.4rem);
}

.verify-intro {
  max-width: 680px;
  margin: 0 auto 38px;
  color: var(--muted);
  font-size: 1.12rem;
}

.case-terminal {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background:
    linear-gradient(
      145deg,
      rgba(216, 170, 61, 0.07),
      rgba(5, 12, 21, 0.96)
    );
  box-shadow:
    0 28px 80px rgba(0, 0, 0, 0.5);
  text-align: left;
}

.terminal-heading {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  color: var(--gold-bright);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-open {
  color: #6ed89c;
}

.case-terminal h2 {
  margin: 28px 0;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

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

.solution-form label {
  color: var(--cream);
  font-weight: 800;
}

.solution-form input {
  width: 100%;
  min-height: 58px;
  padding: 14px 16px;
  border: 1px solid rgba(216, 170, 61, 0.55);
  border-radius: 5px;
  outline: none;
  color: var(--cream);
  background: #050b13;
  font: inherit;
  font-size: 1.08rem;
}

.solution-form input:focus {
  border-color: var(--gold-bright);
  box-shadow:
    0 0 0 3px rgba(216, 170, 61, 0.15);
}

.solution-form input:disabled {
  opacity: 0.72;
}

.verify-button {
  width: fit-content;
  margin-top: 6px;
  cursor: pointer;
}

.verify-button:disabled {
  cursor: default;
  opacity: 0.75;
}

.verification-result {
  display: none;
  margin-top: 24px;
  padding: 18px;
  border-radius: 6px;
}

.verification-result strong,
.verification-result span {
  display: block;
}

.verification-result strong {
  margin-bottom: 5px;
  letter-spacing: 0.08em;
}

.result-success,
.result-error,
.result-incorrect {
  display: block;
}

.result-success {
  border: 1px solid rgba(77, 211, 138, 0.55);
  color: #d9ffea;
  background: rgba(33, 126, 77, 0.22);
}

.result-error,
.result-incorrect {
  border: 1px solid rgba(226, 92, 92, 0.48);
  color: #ffe0e0;
  background: rgba(139, 44, 44, 0.22);
}

.case-solved-reward {
  margin-top: 48px;
  padding: 38px 30px;
  border: 1px solid var(--gold);
  border-radius: 12px;
  background:
    linear-gradient(
      145deg,
      rgba(216, 170, 61, 0.14),
      rgba(13, 26, 43, 0.96)
    );
  box-shadow:
    0 28px 80px rgba(0, 0, 0, 0.42);
}

.case-solved-reward h2 {
  margin-bottom: 18px;
}

.case-solved-reward p {
  color: var(--cream);
}

.reward-placeholder {
  margin-top: 28px;
  padding: 32px 20px;
  border: 1px dashed rgba(216, 170, 61, 0.65);
  border-radius: 8px;
  color: var(--gold-bright);
  background: rgba(0, 0, 0, 0.2);
  font-weight: 800;
}

@media (max-width: 620px) {
  .terminal-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .case-terminal {
    padding: 22px;
  }

  .verify-button {
    width: 100%;
  }
}