/* MARE NOSTRUM MINING LLC — concept "Rock Section" */
:root {
  --c-basalt: #1B1E21;
  --c-basalt-2: #262A2E;
  --c-sea: #0F4C5C;
  --c-sea-dark: #0B3A46;
  --c-ochre: #B5562B;
  --c-lime: #ECE5D8;
  --c-quartz: #F7F5F0;
  --c-brass: #C9A45C;
  --c-ochre-text: #94431F;
  --c-brass-light: #E3C68A;
  --c-muted: #4F555A;
  --c-line: rgba(27, 30, 33, 0.14);
  --c-error: #A33A1C;

  --f-display: "Big Shoulders Display", "Arial Narrow", Arial, sans-serif;
  --f-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;

  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;
  --s-7: 3rem;
  --s-8: 4.5rem;
  --s-9: 6.5rem;

  --r-sm: 2px;
  --r-md: 6px;
  --r-lg: 12px;

  --sh-soft: 0 14px 30px -20px rgba(27, 30, 33, 0.5);

  --wrap: 1200px;
  --gutter: 1rem;
  --header-h: 64px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--f-body); font-size: 1rem; line-height: 1.65; color: var(--c-basalt); background: var(--c-quartz); overflow-x: hidden; }
img, svg { max-width: 100%; display: block; }
a { color: var(--c-sea); text-underline-offset: 3px; }
a:hover { color: var(--c-ochre); }
:focus-visible { outline: 3px solid var(--c-brass); outline-offset: 3px; border-radius: var(--r-sm); }

h1, h2, h3 { font-family: var(--f-display); font-weight: 800; line-height: 0.95; text-transform: uppercase; letter-spacing: 0.01em; margin: 0 0 var(--s-4); }
h1 { font-size: clamp(3rem, 13vw, 7.5rem); }
h2 { font-size: clamp(2.2rem, 7vw, 4rem); }
h3 { font-size: 1.6rem; }
p { margin: 0 0 var(--s-4); }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.skip-link { position: absolute; left: var(--s-4); top: -100px; z-index: 100; background: var(--c-brass); color: var(--c-basalt); padding: var(--s-2) var(--s-4); font-weight: 600; }
.skip-link:focus { top: var(--s-4); }

.coord {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-family: var(--f-body); font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--c-ochre-text); margin-bottom: var(--s-3);
}
.coord::before { content: ""; width: 12px; height: 12px; border: 2px solid currentColor; transform: rotate(45deg); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 50px; padding: 0 var(--s-5);
  border-radius: var(--r-sm); border: 2px solid transparent;
  font-family: var(--f-display); font-weight: 800; font-size: 1.15rem; letter-spacing: 0.06em; text-transform: uppercase;
  text-decoration: none; cursor: pointer;
  transition: transform 0.25s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--brass { background: var(--c-brass); color: var(--c-basalt); }
.btn--brass:hover { color: var(--c-basalt); }
.btn--line { border-color: currentColor; color: inherit; }
.btn--line:hover { color: inherit; }
.btn--sea { background: var(--c-sea); color: #fff; }
.btn--sea:hover { background: var(--c-sea-dark); color: #fff; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--c-basalt); color: var(--c-quartz); border-bottom: 3px solid var(--c-ochre); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--s-4); min-height: var(--header-h); }
.brand { display: inline-flex; align-items: center; gap: var(--s-3); color: var(--c-quartz); text-decoration: none; }
.brand:hover { color: var(--c-quartz); }
.brand__mark { width: 36px; height: 36px; flex-shrink: 0; }
.brand__name { font-family: var(--f-display); font-weight: 800; font-size: 1.35rem; line-height: 1; letter-spacing: 0.04em; text-transform: uppercase; }
.brand__name small { display: block; margin-top: 3px; font-family: var(--f-body); font-weight: 500; font-size: 0.68rem; letter-spacing: 0.2em; color: #BFC5CA; }

.nav-toggle { display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; width: 46px; height: 46px; padding: 0 11px; border: 1px solid rgba(247, 245, 240, 0.3); border-radius: var(--r-md); background: transparent; cursor: pointer; }
.nav-toggle span { display: block; height: 2px; width: 100%; background: var(--c-quartz); transition: transform 0.3s var(--ease), opacity 0.3s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-nav {
  position: fixed; inset: calc(var(--header-h) + 3px) 0 auto 0;
  background: var(--c-basalt); padding: var(--s-4) var(--gutter) var(--s-6);
  box-shadow: var(--sh-soft);
  opacity: 0; transform: translateY(-12px); visibility: hidden; pointer-events: none;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s;
}
.site-nav.is-open { opacity: 1; transform: none; visibility: visible; pointer-events: auto; }
.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav a { display: block; padding: var(--s-3) 0; font-family: var(--f-display); font-weight: 700; font-size: 1.2rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--c-quartz); text-decoration: none; border-bottom: 1px solid rgba(247, 245, 240, 0.12); }
.site-nav a:hover { color: var(--c-brass); }
.site-nav .nav-cta { margin-top: var(--s-4); }
.site-nav .nav-cta a { border: 0; text-align: center; background: var(--c-brass); color: var(--c-basalt); }

/* Hero: strata */
.hero { position: relative; overflow: hidden; color: var(--c-quartz); background: var(--c-basalt); }
.strata { position: absolute; inset: 0; display: grid; grid-template-rows: 1.1fr 0.5fr 1.4fr 0.6fr 1fr 1.6fr; }
.stratum { position: relative; }
.stratum--1 { background: linear-gradient(180deg, #2E5F6B, var(--c-sea)); }
.stratum--2 { background: repeating-linear-gradient(90deg, #8E8270 0 4px, #A3967F 4px 9px); }
.stratum--3 { background: radial-gradient(circle at 20% 40%, rgba(255, 255, 255, 0.12) 0 3px, transparent 4px) 0 0 / 26px 22px, radial-gradient(circle at 70% 70%, rgba(0, 0, 0, 0.18) 0 4px, transparent 5px) 0 0 / 34px 30px, var(--c-ochre); }
.stratum--4 { background: repeating-linear-gradient(-20deg, #3A3F44 0 6px, #2F3337 6px 14px); }
.stratum--5 { background: radial-gradient(circle, rgba(201, 164, 92, 0.6) 0 1.5px, transparent 2px) 0 0 / 14px 14px, #5A4A38; }
.stratum--6 { background: repeating-linear-gradient(160deg, #1F2326 0 18px, #23272A 18px 36px); }
.hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(27, 30, 33, 0.92) 0%, rgba(27, 30, 33, 0.78) 55%, rgba(27, 30, 33, 0.2) 100%); z-index: 1; }
.hero__inner { position: relative; z-index: 2; padding-top: var(--s-8); padding-bottom: var(--s-9); }
.hero .coord { color: var(--c-brass); }
.hero h1 { max-width: 12ch; }
.hero h1 span { color: var(--c-brass); }
.hero__lead { font-size: 1.12rem; color: #DCE0E3; max-width: 34rem; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-5); }
.hero__legend { display: none; }

/* Core sample scroll indicator */
.core {
  display: none;
  position: fixed; right: 10px; top: calc(var(--header-h) + 24px); bottom: 24px; z-index: 40;
  width: 10px; border-radius: 6px;
  background: rgba(27, 30, 33, 0.12);
  overflow: hidden; pointer-events: none;
}
.core__fill {
  --p: 0;
  position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--c-sea) 0 18%, #A3967F 18% 26%, var(--c-ochre) 26% 50%, #3A3F44 50% 60%, #5A4A38 60% 78%, var(--c-basalt) 78% 100%);
  transform-origin: top;
  transform: scaleY(var(--p));
}
.core__fill.is-full { transform: none; }

/* Sections */
.section { padding: var(--s-8) 0; }
.section--lime { background: var(--c-lime); }
.section--sea { background: var(--c-sea); color: var(--c-quartz); }
.section--sea .coord { color: var(--c-brass-light); }
.section--basalt { background: var(--c-basalt); color: var(--c-quartz); }
.section--basalt .coord { color: var(--c-brass); }
.section__head { max-width: 46rem; margin-bottom: var(--s-6); }
.section__head p { color: var(--c-muted); font-size: 1.06rem; }
.section--sea .section__head p, .section--basalt .section__head p { color: #D6DEE0; }

/* About split */
.about { display: grid; gap: var(--s-6); }
.about__panel {
  min-height: 260px; border-radius: var(--r-lg); position: relative; overflow: hidden;
  background:
    linear-gradient(180deg, transparent 0 30%, rgba(27, 30, 33, 0.85) 30% 31%, transparent 31%),
    linear-gradient(180deg, transparent 0 58%, rgba(27, 30, 33, 0.85) 58% 59%, transparent 59%),
    radial-gradient(circle at 30% 45%, rgba(255, 255, 255, 0.12) 0 2px, transparent 3px) 0 0 / 22px 20px,
    linear-gradient(180deg, #A3967F 0 30%, var(--c-ochre) 30% 58%, #5A4A38 58%);
}
.about__panel::after {
  content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 36px; margin-left: -18px;
  background: repeating-linear-gradient(180deg, var(--c-quartz) 0 2px, transparent 2px 22px);
  border-left: 2px solid var(--c-quartz); border-right: 2px solid var(--c-quartz);
  opacity: 0.85;
}

/* Principles */
.principles { display: grid; gap: var(--s-4); }
.principle { padding: var(--s-5); border-top: 3px solid var(--c-brass); background: rgba(247, 245, 240, 0.06); border-radius: 0 0 var(--r-lg) var(--r-lg); }
.principle h3 { color: var(--c-quartz); }
.principle p { color: #D6DEE0; margin: 0; }
.principle__code { display: block; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.16em; color: var(--c-brass-light); margin-bottom: var(--s-2); }

/* Partners */
.partners { display: grid; gap: var(--s-4); }
.partner { padding: var(--s-5); background: var(--c-quartz); border: 1px solid var(--c-line); border-radius: var(--r-lg); box-shadow: var(--sh-soft); }
.partner p { color: var(--c-muted); margin: 0; }
.partner h3 { color: var(--c-sea); }

.notice { padding: var(--s-5); border-left: 6px solid var(--c-ochre); background: var(--c-quartz); border-radius: 0 var(--r-lg) var(--r-lg) 0; box-shadow: var(--sh-soft); }
.notice h2 { font-size: 1.6rem; }
.notice p { margin: 0; color: var(--c-muted); }

/* Contact */
.contact { display: grid; gap: var(--s-6); }
.contact__info dl { margin: 0; display: grid; gap: var(--s-4); }
.contact__info dt { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: #BFC5CA; }
.contact__info dd { margin: 0; word-break: break-word; }
.contact__info a { color: var(--c-brass); }
.form { background: var(--c-quartz); color: var(--c-basalt); border-radius: var(--r-lg); padding: var(--s-5); box-shadow: var(--sh-soft); }
.form a { color: var(--c-sea); }
.form__row { display: grid; gap: 0 var(--s-4); }
.field { display: grid; gap: var(--s-1); margin-bottom: var(--s-3); }
.field label { font-weight: 600; font-size: 0.95rem; }
.field input, .field select, .field textarea { width: 100%; min-height: 48px; padding: var(--s-3) var(--s-4); font: inherit; color: var(--c-basalt); background: #fff; border: 1.5px solid rgba(27, 30, 33, 0.3); border-radius: var(--r-md); }
.field textarea { min-height: 130px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--c-sea); box-shadow: 0 0 0 3px rgba(201, 164, 92, 0.55); }
.field.is-invalid input, .field.is-invalid select, .field.is-invalid textarea { border-color: var(--c-error); }
.field__error { min-height: 1.2em; font-size: 0.85rem; color: var(--c-error); }
.field--check { grid-template-columns: auto 1fr; align-items: start; gap: var(--s-3); }
.field--check input { width: 22px; height: 22px; min-height: 0; margin-top: 2px; accent-color: var(--c-sea); }
.field--check label { font-weight: 400; font-size: 0.92rem; color: var(--c-muted); }
.field--check .field__error { grid-column: 1 / -1; }
.form__success { display: none; padding: var(--s-5); border-radius: var(--r-lg); background: var(--c-quartz); color: var(--c-basalt); border-left: 6px solid var(--c-brass); }
.form__success.is-visible { display: block; }

/* Legal / 404 */
.page-hero { padding: var(--s-7) 0 var(--s-5); background: var(--c-lime); border-bottom: 3px solid var(--c-ochre); }
.page-hero h1 { font-size: clamp(2.6rem, 9vw, 4.4rem); margin: 0; }
.legal { padding: var(--s-7) 0 var(--s-8); }
.legal__body { max-width: 46rem; }
.legal__body h2 { font-size: 1.8rem; margin-top: var(--s-6); }
.legal__body ul { padding-left: var(--s-5); }
.legal__updated { color: var(--c-muted); }
.notfound { position: relative; overflow: hidden; padding: var(--s-9) 0; color: var(--c-quartz); background: var(--c-basalt); text-align: center; }
.notfound .strata { opacity: 0.35; }
.notfound .wrap { position: relative; z-index: 1; }
.notfound p { color: #DCE0E3; }

/* Footer */
.site-footer { background: var(--c-basalt); color: #D2D7DB; padding: var(--s-7) 0 var(--s-5); border-top: 3px solid var(--c-ochre); }
.site-footer a { color: var(--c-quartz); }
.site-footer a:hover { color: var(--c-brass); }
.footer__grid { display: grid; gap: var(--s-6); }
.footer__brand p { color: #BFC5CA; max-width: 24rem; margin-top: var(--s-4); }
.footer__nav h2 { font-family: var(--f-body); font-size: 0.78rem; font-weight: 600; letter-spacing: 0.16em; color: var(--c-brass); margin-bottom: var(--s-3); }
.footer__nav ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-2); }
.footer__nav a { text-decoration: none; }
.footer__legal { margin-top: var(--s-6); padding-top: var(--s-5); border-top: 1px solid rgba(247, 245, 240, 0.15); font-size: 0.875rem; line-height: 1.7; color: #D2D7DB; }
.footer__legal p { margin: 0 0 var(--s-2); }
.footer__legal-links { display: flex; flex-wrap: wrap; gap: var(--s-4); margin-top: var(--s-3); }

/* Reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-in, .no-js .reveal { opacity: 1; transform: none; }

/* Breakpoints */
@media (min-width: 480px) {
  :root { --gutter: 1.5rem; }
  .form__row { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 768px) {
  :root { --header-h: 74px; }
  .core { display: block; }
  .about { grid-template-columns: 1fr 1fr; align-items: center; gap: var(--s-8); }
  .about__panel { min-height: 380px; }
  .principles { grid-template-columns: 1fr 1fr; }
  .partners { grid-template-columns: repeat(3, 1fr); }
  .contact { grid-template-columns: 0.8fr 1.2fr; }
  .form { padding: var(--s-6); }
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .hero__legend { display: grid; position: absolute; right: var(--s-7); bottom: var(--s-6); z-index: 2; gap: var(--s-1); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; color: #DCE0E3; text-align: right; }
}
@media (min-width: 1024px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; opacity: 1; transform: none; visibility: visible; pointer-events: auto; background: transparent; padding: 0; box-shadow: none; }
  .site-nav ul { display: flex; align-items: center; gap: var(--s-5); }
  .site-nav a { border: 0; padding: var(--s-2) 0; font-size: 1.1rem; }
  .site-nav .nav-cta { margin: 0; }
  .site-nav .nav-cta a { padding: var(--s-2) var(--s-5); }
  .hero__inner { padding-top: var(--s-9); padding-bottom: var(--s-9); }
  .principles { grid-template-columns: repeat(4, 1fr); }
  .section { padding: var(--s-9) 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}