/* Severn STM Limited - severnstm.digital */

:root {
  --svn-bg: #ffffff;
  --svn-ink: #16181c;
  --svn-accent: #a2231d;
  --svn-accent2: #5d6470;
  --svn-paper: #f6f4f1;
  --svn-hair: #d9d5d0;
  --svn-hair-soft: #ebe8e4;
  --svn-side-w: 16.5rem;
  --svn-read: 36rem;
  --svn-sans: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --svn-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
}

html { box-sizing: border-box; }

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

body.svn-body {
  margin: 0;
  background: var(--svn-bg);
  color: var(--svn-ink);
  font-family: var(--svn-serif);
  font-size: 1.02rem;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}

.svn-body p { margin: 0 0 1.1em; }

.svn-body a { color: var(--svn-accent); }

.svn-body :focus-visible {
  outline: 2px solid var(--svn-accent);
  outline-offset: 3px;
}

.svn-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 70;
  padding: 0.7rem 1.1rem;
  background: var(--svn-accent);
  color: #ffffff;
  font-family: var(--svn-sans);
  font-weight: 600;
  text-decoration: none;
}

.svn-skip:focus { left: 0.6rem; top: 0.6rem; }

.svn-shell { display: block; }

/* ---- left sidebar ---- */

.svn-side {
  background: var(--svn-paper);
  border-bottom: 1px solid var(--svn-hair);
}

.svn-side-inner { padding: 1.1rem 1.15rem 0.9rem; }

.svn-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--svn-ink);
}

.svn-brand-mark { display: block; flex: 0 0 auto; }

.svn-brand-text { display: block; }

.svn-brand-name {
  display: block;
  font-family: var(--svn-sans);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.svn-brand-role {
  display: block;
  font-family: var(--svn-sans);
  font-weight: 500;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--svn-accent2);
  margin-top: 0.16rem;
}

.svn-index { margin-top: 1rem; }

.svn-index-title {
  margin: 0 0 0.5rem;
  font-family: var(--svn-sans);
  font-weight: 600;
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--svn-accent2);
}

.svn-index-list {
  display: flex;
  gap: 0.35rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.svn-index-link {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.34rem 0.6rem;
  border: 1px solid var(--svn-hair);
  background: #ffffff;
  color: var(--svn-accent2);
  font-family: var(--svn-sans);
  font-size: 0.76rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.svn-index-num {
  font-weight: 700;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--svn-accent);
}

.svn-index-label { font-weight: 500; }

.svn-index-link:hover { color: var(--svn-ink); border-color: var(--svn-accent2); }

.svn-index-link.svn-is-active {
  background: var(--svn-accent);
  border-color: var(--svn-accent);
  color: #ffffff;
}

.svn-index-link.svn-is-active .svn-index-num { color: #ffffff; }

.svn-side-foot { display: none; }

/* ---- chapters ---- */

.svn-main { display: block; padding: 0 1.15rem; }

.svn-chapter {
  padding: 2.2rem 0 2.4rem;
  border-bottom: 1px solid var(--svn-hair-soft);
}

.svn-chapter:last-of-type { border-bottom: 0; }

.svn-chapter-num {
  margin: 0 0 0.35rem;
  font-family: var(--svn-sans);
  font-weight: 700;
  font-size: 2.6rem;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--svn-accent);
}

.svn-chapter-body { max-width: var(--svn-read); }

.svn-chapter-title {
  margin: 0 0 0.85rem;
  font-family: var(--svn-sans);
  font-weight: 700;
  font-size: clamp(1.55rem, 6.4vw, 2.15rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.svn-lede {
  font-size: 1.14rem;
  line-height: 1.55;
  color: var(--svn-ink);
}

.svn-aside {
  margin: 1.4rem 0 0;
  padding: 0.9rem 0 0.9rem 1.05rem;
  border-left: 3px solid var(--svn-accent);
  background: var(--svn-paper);
  font-size: 0.98rem;
  color: var(--svn-accent2);
}

.svn-mail { margin: 1.2rem 0 1.5rem; }

.svn-mail-link {
  font-family: var(--svn-sans);
  font-weight: 600;
  font-size: clamp(1.05rem, 4.6vw, 1.35rem);
  color: var(--svn-accent);
  text-decoration: none;
  border-bottom: 2px solid var(--svn-hair);
  padding-bottom: 2px;
  word-break: break-word;
}

.svn-mail-link:hover { border-bottom-color: var(--svn-accent); }

.svn-inline-link { color: var(--svn-accent); }

.svn-fact-list {
  margin: 0 0 1.3rem;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--svn-hair);
}

.svn-fact {
  display: block;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--svn-hair-soft);
}

.svn-fact-key {
  display: block;
  font-family: var(--svn-sans);
  font-weight: 600;
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--svn-accent2);
  margin-bottom: 0.16rem;
}

.svn-fact-val { display: block; }

/* ---- footer ---- */

.svn-footer {
  background: var(--svn-ink);
  color: #e8e6e3;
  padding: 2rem 1.15rem 2.4rem;
}

.svn-footer-inner { display: block; }

.svn-footer-col { margin-bottom: 1.35rem; }

.svn-footer-col:last-child { margin-bottom: 0; }

.svn-footer-name {
  margin: 0 0 0.5rem;
  font-family: var(--svn-sans);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #ffffff;
}

.svn-footer-address {
  font-style: normal;
  font-size: 0.92rem;
  line-height: 1.65;
  color: #bfbcb8;
}

.svn-footer-reg {
  margin: 0 0 0.3rem;
  font-family: var(--svn-sans);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: #bfbcb8;
}

.svn-footer-link {
  color: #ffffff;
  font-family: var(--svn-sans);
  font-size: 0.82rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.32);
}

.svn-footer-link:hover { border-bottom-color: var(--svn-accent); }

.svn-footer p { margin: 0 0 0.45rem; }

/* ---- data notice page ---- */

.svn-doc-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.9rem 1.15rem;
  background: var(--svn-paper);
  border-bottom: 1px solid var(--svn-hair);
}

.svn-doc-org {
  margin: 0;
  font-family: var(--svn-sans);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.svn-doc-home {
  font-family: var(--svn-sans);
  font-size: 0.78rem;
  color: var(--svn-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--svn-hair);
}

.svn-doc-home:hover { border-bottom-color: var(--svn-accent); }

.svn-doc { padding: 2rem 1.15rem 3rem; max-width: 44rem; }

.svn-doc-title {
  margin: 0 0 0.7rem;
  font-family: var(--svn-sans);
  font-weight: 700;
  font-size: clamp(1.7rem, 7vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.svn-doc-lede {
  font-size: 1.1rem;
  line-height: 1.6;
  padding-bottom: 1.2rem;
  border-bottom: 2px solid var(--svn-ink);
}

.svn-doc-chapter { padding: 1.6rem 0; border-bottom: 1px solid var(--svn-hair-soft); }

.svn-doc-chapter:last-of-type { border-bottom: 0; }

.svn-doc-head {
  margin: 0 0 0.7rem;
  font-family: var(--svn-sans);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.svn-doc-num {
  display: block;
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--svn-accent);
  margin-bottom: 0.28rem;
}

.svn-doc-list { margin: 0 0 1.1em; padding-left: 1.15rem; }

.svn-doc-list li { margin-bottom: 0.42em; }

/* ---- 700px and wider ---- */

@media (min-width: 700px) {
  .svn-main { padding: 0 2.2rem; }
  .svn-footer { padding: 2.6rem 2.2rem 3rem; }
  .svn-side-inner { padding: 1.5rem 2.2rem 1.2rem; }
  .svn-doc { padding: 2.8rem 2.2rem 4rem; }
  .svn-doc-bar { padding: 1rem 2.2rem; }

  .svn-chapter {
    display: grid;
    grid-template-columns: 5rem 1fr;
    gap: 0 1.8rem;
    padding: 3rem 0 3.2rem;
  }

  .svn-chapter-num {
    margin: 0;
    font-size: 3rem;
    text-align: right;
    line-height: 1.05;
  }

  .svn-chapter-body { grid-column: 2; }

  .svn-fact {
    display: grid;
    grid-template-columns: 11rem 1fr;
    gap: 1rem;
    align-items: baseline;
  }

  .svn-fact-key { margin-bottom: 0; }

  .svn-footer-inner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .svn-footer-col { margin-bottom: 0; }
}

/* ---- 1000px and wider ---- */

@media (min-width: 1000px) {
  .svn-shell {
    display: grid;
    grid-template-columns: var(--svn-side-w) 1fr;
    align-items: start;
  }

  .svn-side {
    position: sticky;
    top: 0;
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid var(--svn-hair);
    overflow-y: auto;
  }

  .svn-side-inner {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 2.4rem 1.6rem 1.8rem;
  }

  .svn-index { margin-top: 2.2rem; }

  .svn-index-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .svn-index-link {
    border: 0;
    border-left: 2px solid var(--svn-hair);
    background: transparent;
    padding: 0.44rem 0 0.44rem 0.8rem;
  }

  .svn-index-link.svn-is-active {
    background: transparent;
    border-left-color: var(--svn-accent);
    color: var(--svn-ink);
  }

  .svn-index-link.svn-is-active .svn-index-num { color: var(--svn-accent); }

  .svn-side-foot {
    display: block;
    margin: auto 0 0;
    padding-top: 1.4rem;
    font-family: var(--svn-sans);
    font-size: 0.72rem;
    line-height: 1.6;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--svn-accent2);
  }

  .svn-main { padding: 0 3.4rem 0 3rem; }

  .svn-chapter { grid-template-columns: 6rem 1fr; gap: 0 2.4rem; padding: 4rem 0 4.2rem; }

  .svn-chapter-num { font-size: 3.6rem; }

  .svn-footer { padding: 3rem 3rem 3.4rem; }
}

@media (prefers-reduced-motion: reduce) {
  .svn-body * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}