:root {
  --main-color: rgb(79, 70, 229);
  --main-color-dark: rgb(55, 48, 163);
  --accent-color: rgb(129, 140, 248);
  --text-dark: rgb(30, 41, 59);
  --text-soft: rgb(71, 85, 105);
  --card-bg: rgba(255, 255, 255, 0.92);
  --border-soft: rgba(99, 102, 241, 0.16);
  --shadow-soft: 0 12px 35px rgba(15, 23, 42, 0.08);
  --shadow-hover: 0 18px 45px rgba(79, 70, 229, 0.16);
  --radius-lg: 24px;
  --radius-md: 18px;
}

html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.7;
  color: var(--text-dark);
  background:
    radial-gradient(circle at top left, rgba(129, 140, 248, 0.18), transparent 30%),
    radial-gradient(circle at top right, rgba(59, 130, 246, 0.14), transparent 28%),
    linear-gradient(180deg, rgb(244, 247, 255), rgb(232, 238, 255));
}

.page-shell {
  width: 100%;
}

.page-wrapper {
  width: min(92%, 980px);
  margin: 2rem auto 3rem;
}

.back-button {
  display: inline-block;
  margin-bottom: 1.25rem;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: bold;
  color: white;
  background: linear-gradient(135deg, var(--main-color), var(--main-color-dark));
  box-shadow: 0 10px 25px rgba(79, 70, 229, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.back-button:hover,
.back-button:focus {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(79, 70, 229, 0.3);
}

.hero,
.content-card,
.rd-footer {
  background: var(--card-bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.hero {
  padding: 2.25rem 2rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.96), rgba(99, 102, 241, 0.88));
  color: white;
}

.hero h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
}

.hero p {
  margin: 0;
  max-width: 700px;
  color: rgba(255, 255, 255, 0.92);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.load-btn,
.celebrate-btn {
  position: relative;
  border: none;
  border-radius: 999px;
  padding: 0.85rem 1.3rem;
  font-weight: bold;
  font-size: 1rem;
  cursor: pointer;
  color: white;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.load-btn {
  background: linear-gradient(135deg, #6366f1, #4338ca);
  box-shadow: 0 10px 20px rgba(79, 70, 229, 0.25);
}

.load-btn.primary {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  box-shadow: 0 10px 20px rgba(34, 197, 94, 0.3);
}

.celebrate-btn {
  background: linear-gradient(135deg, #f59e0b, #ef4444, #8b5cf6);
  background-size: 200% 200%;
  box-shadow: 0 10px 25px rgba(239, 68, 68, 0.35);
}

.load-btn:hover,
.celebrate-btn:hover {
  transform: translateY(-3px);
  filter: brightness(1.04);
}

.load-btn:active,
.celebrate-btn:active {
  transform: translateY(0);
}

.content-card {
  padding: 2rem;
}

.content-area {
  max-width: 780px;
  margin: 0 auto;
}

.content-area > :first-child {
  margin-top: 0;
}

.content-area h1,
.content-area h2,
.content-area h3 {
  color: var(--main-color-dark);
  line-height: 1.2;
}

.content-area p,
.content-area li {
  color: var(--text-soft);
}

.content-area ul {
  padding-left: 1.25rem;
}

.content-area code {
  font-family: "Courier New", Courier, monospace;
  background: rgba(99, 102, 241, 0.1);
  color: var(--main-color-dark);
  padding: 0.15rem 0.45rem;
  border-radius: 8px;
}

.content-area pre {
  margin: 1rem 0 1.25rem;
  padding: 1rem 1.1rem;
  border-radius: 16px;
  overflow-x: auto;
  background: linear-gradient(180deg, rgb(15, 23, 42), rgb(30, 41, 59));
  color: rgb(241, 245, 249);
}

.content-area pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.content-area a {
  color: var(--main-color);
  font-weight: bold;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.rd-footer {
  margin-top: 1.5rem;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.rd-footer p {
  margin: 0;
  color: var(--text-soft);
  font-weight: bold;
}

.footer-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.footer-links a {
  text-decoration: none;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.12), rgba(129, 140, 248, 0.18));
  color: var(--main-color-dark);
  font-weight: bold;
  border: 1px solid rgba(99, 102, 241, 0.12);
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.footer-links a:hover,
.footer-links a:focus {
  transform: translateY(-2px);
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.18), rgba(129, 140, 248, 0.24));
  box-shadow: 0 10px 20px rgba(79, 70, 229, 0.12);
}

@media (max-width: 700px) {
  .page-wrapper {
    width: min(94%, 100%);
    margin: 1.25rem auto 2rem;
  }

  .hero,
  .content-card {
    padding: 1.4rem 1.2rem;
  }

  .controls {
    flex-direction: column;
    width: 100%;
  }

  .load-btn,
  .celebrate-btn {
    width: 100%;
    text-align: center;
  }

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

  .footer-links {
    width: 100%;
  }

  .footer-links a {
    width: 100%;
    text-align: center;
  }
}