:root {
  --background: #0d0d0d;
  --surface: #181818;
  --surface-alt: #262626;

  --text: #ffffff;
  --muted: #b8b8b8;

  --primary: #c8102e;
  --primary-dark: #950c22;

  --border: #3a3a3a;
  --danger: #ff4d5e;

  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --radius: 12px;
  --content-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family:
    Inter,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  line-height: 1.6;
}

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

img {
  max-width: 100%;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  width: min(var(--content-width), calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-title {
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 750;
  text-decoration: none;
}

.site-navigation {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-navigation a {
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
}

.site-navigation a:hover {
  color: var(--primary);
}

main {
  width: min(var(--content-width), calc(100% - 32px));
  min-height: 70vh;
  margin: 0 auto;
  padding: 56px 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  gap: 40px;
  align-items: start;
  margin-bottom: 48px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
}

.hero p {
  color: var(--muted);
  font-size: 1.1rem;
}

.hero-content {
  min-width: 0;
}

.donation-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.donation-card h2 {
  margin-top: 0;
  margin-bottom: 12px;
}

.donation-card p {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 1rem;
}

.section-heading {
  margin-bottom: 22px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  display: block;
  min-width: 0;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--text);
  text-decoration: none;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    border-color 160ms ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: 0 12px 32px rgba(200, 16, 46, 0.22);
}

.card h2,
.card h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.45rem;
  line-height: 1.25;
  overflow-wrap: anywhere;
  hyphens: auto;
}

.card p {
  margin-bottom: 0;
  color: var(--muted);
}

.course-header {
  margin-bottom: 32px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.course-header h1 {
  margin-top: 0;
}

.metadata {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.metadata-item {
  padding: 14px;
  background: var(--surface-alt);
  border-radius: 8px;
}

.metadata-label {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
}

.document-list {
  display: grid;
  gap: 16px;
}

.document-card {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.document-card h3 {
  margin: 0 0 8px;
}

.document-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.button {
  display: inline-block;
  margin-top: 14px;
  padding: 10px 17px;
  background: var(--primary);
  border: 0;
  border-radius: 8px;
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
}

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

.button-secondary {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
}

.button-secondary:hover {
  background: #353535;
}

.notice {
  margin: 24px 0;
  padding: 18px;
  background: #251216;
  border: 1px solid #8f2638;
  border-radius: 10px;
  color: #f5d7dc;
}

.legal-notice {
  color: var(--danger);
  font-weight: 650;
}

.viewer-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 18px;
}

.viewer-container {
  position: relative;
  min-height: 500px;
  padding: 20px;
  overflow: auto;
  background: #3d424b;
  border-radius: var(--radius);
  user-select: none;
}

.pdf-page-wrapper {
  position: relative;
  width: fit-content;
  margin: 0 auto 22px;
}

.pdf-page-wrapper canvas {
  display: block;
  max-width: 100%;
  height: auto;
  background: white;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.watermark {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  color: rgba(80, 80, 80, 0.16);
  font-size: clamp(1rem, 4vw, 2.3rem);
  font-weight: 800;
  pointer-events: none;
  transform: rotate(-28deg);
}

.site-footer {
  padding: 32px 16px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  color: var(--muted);
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}

.error-message {
  padding: 20px;
  background: #2c1116;
  border: 1px solid #9c293c;
  border-radius: 10px;
  color: #ffd7dd;
}

@media (max-width: 700px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }
}

  main {
    padding-top: 36px;
  }

  .viewer-container {
    padding: 8px;
  }
}

.feedback-page {
  max-width: 820px;
  margin: 40px auto;
}

.feedback-form {
  margin-top: 28px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.feedback-form iframe {
  display: block;
  width: 100%;
  min-height: 500px;
  border: 0;
}

.muted-text {
  color: var(--muted);
  font-size: 0.95rem;
}