/* ============================================================
   OBOS — One Boat Operating System · Safiery
   Dark marine-tech brochure. Palette + type pulled from the
   bioluminescent dusk of the hero render.
   ============================================================ */

:root {
  /* color */
  --ink:        #06090d;   /* deepest, near-black hull */
  --bg:         #0a1119;   /* midnight water */
  --bg-2:       #0e1822;   /* raised surface */
  --bg-3:       #132433;   /* card / hover */
  --line:       #1f3242;   /* hairline */
  --line-soft:  #16242f;

  --text:       #e7eef1;   /* foam white */
  --muted:      #8ba0ac;   /* horizon grey */
  --faint:      #51697a;

  --aqua:       #46e0c8;   /* bioluminescent wake */
  --aqua-deep:  #1f9c8c;
  --amber:      #e9a866;   /* sunset on the water */
  --amber-soft: #c98c52;

  /* type */
  --display: "Bricolage Grotesque", serif;
  --body:    "Spline Sans", system-ui, sans-serif;
  --mono:    "Space Mono", ui-monospace, monospace;

  /* layout */
  --pad: clamp(1.25rem, 5vw, 6rem);
  --maxw: 1280px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(120% 80% at 80% -10%, rgba(233,168,102,0.08), transparent 55%),
    radial-gradient(90% 70% at 0% 5%, rgba(70,224,200,0.07), transparent 50%),
    var(--bg);
  color: var(--text);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.mono { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; }
.accent { color: var(--aqua); }
em { font-style: italic; color: var(--amber); }

/* film grain overlay ------------------------------------------------ */
.grain {
  position: fixed; inset: 0; z-index: 100; pointer-events: none;
  opacity: 0.04; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============================================================ NAV */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 2rem;
  padding: 0.9rem var(--pad);
  background: rgba(10,17,25,0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.nav__brand { display: flex; align-items: baseline; gap: 0.55rem; text-decoration: none; }
.nav__mark {
  font-family: var(--display); font-weight: 800; font-size: 1.35rem;
  letter-spacing: 0.02em; color: var(--text);
}
.nav__by { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); }
.nav__links { display: flex; gap: 1.75rem; margin-left: auto; }
.nav__links a {
  color: var(--muted); text-decoration: none; font-size: 0.92rem;
  transition: color 0.2s;
}
.nav__links a:hover { color: var(--aqua); }
.nav__cta {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink); background: var(--aqua); text-decoration: none;
  padding: 0.55rem 0.95rem; border-radius: 2px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.nav__cta:hover { transform: translateY(-1px); box-shadow: 0 6px 22px -8px var(--aqua-deep); }

/* ============================================================ HERO */
.hero { position: relative; min-height: 92vh; display: flex; align-items: flex-end; }
.hero__media { position: absolute; inset: 0; z-index: 0; }
.hero__media img { width: 100%; height: 100%; object-fit: cover; object-position: center 35%; }
.hero__scrim {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(6,9,13,0.55) 0%, rgba(6,9,13,0) 28%, rgba(6,9,13,0.35) 62%, rgba(10,17,25,0.96) 100%),
    linear-gradient(90deg, rgba(6,9,13,0.7) 0%, transparent 60%);
}
.hero__content {
  position: relative; z-index: 1;
  padding: 0 var(--pad) clamp(3rem, 8vh, 6rem);
  max-width: 820px;
  animation: rise 1s cubic-bezier(0.2,0.7,0.2,1) both;
}
.eyebrow {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--aqua); margin-bottom: 1.1rem;
}
.hero__title {
  font-family: var(--display); font-weight: 800;
  font-size: clamp(2.8rem, 8vw, 6.5rem); line-height: 0.98;
  letter-spacing: -0.02em; color: var(--text);
  text-shadow: 0 2px 40px rgba(6,9,13,0.6);
}
.hero__sub {
  margin-top: 1.4rem; max-width: 50ch; font-size: 1.12rem; color: #cdd9de;
}
.hero__meta {
  display: flex; flex-wrap: wrap; gap: 1.75rem; margin-top: 2.2rem;
  font-size: 0.9rem; color: var(--muted);
}
.hero__meta b { color: var(--text); font-weight: 600; }
.hero__caption {
  position: absolute; right: var(--pad); bottom: 1.4rem; z-index: 1;
  color: var(--faint);
}

@keyframes rise { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }

/* ============================================================ MANIFESTO */
.manifesto {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(4rem, 12vh, 9rem) var(--pad);
  display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(1.5rem, 5vw, 5rem);
  align-items: start;
}
.manifesto__lead {
  font-family: var(--display); font-weight: 500;
  font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.05; letter-spacing: -0.01em;
}
.manifesto__body { color: var(--muted); font-size: 1.05rem; padding-top: 0.5rem; }

/* ============================================================ shared section head */
.section-head { max-width: 60ch; margin-bottom: clamp(2.5rem, 6vw, 4rem); }
.section-head__tag { display: inline-block; color: var(--amber); margin-bottom: 1rem; }
.section-head h2,
.ai h2, .twin h2, .power h2, .closing h2 {
  font-family: var(--display); font-weight: 700;
  font-size: clamp(1.9rem, 4.2vw, 3.2rem); line-height: 1.02; letter-spacing: -0.015em;
}
.section-head p { margin-top: 1rem; color: var(--muted); }

/* ============================================================ ARCHITECTURE */
.arch { max-width: var(--maxw); margin: 0 auto; padding: clamp(3rem, 8vh, 6rem) var(--pad); }

.modules {
  list-style: none;
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--line-soft);
  border: 1px solid var(--line-soft); border-radius: 4px; overflow: hidden;
}
.module {
  display: flex; gap: 1.25rem; align-items: flex-start;
  background: var(--bg-2); padding: 1.6rem 1.5rem;
  position: relative; transition: background 0.25s;
}
.module::before {
  content: attr(data-layer);
  position: absolute; top: 1.6rem; right: 1.25rem;
  font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--faint);
}
.module:hover { background: var(--bg-3); }
.module__num {
  font-family: var(--mono); font-size: 1rem; color: var(--aqua);
  padding-top: 0.2rem; min-width: 1.8rem;
}
.module__text h3 { font-family: var(--display); font-weight: 600; font-size: 1.18rem; }
.module__text p { color: var(--muted); font-size: 0.95rem; margin-top: 0.3rem; max-width: 34ch; }

/* layer stack diagram */
.layers { margin-top: 2.5rem; display: grid; gap: 0.5rem; }
.layers__tag { color: var(--faint); margin-bottom: 0.25rem; }
.layer {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.4rem 1rem;
  padding: 1.1rem 1.4rem; border-radius: 3px;
  border: 1px solid var(--line);
  background: linear-gradient(90deg, var(--bg-2), var(--bg-2));
  position: relative; overflow: hidden;
}
.layer::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
}
.layer--ai::before      { background: var(--aqua); }
.layer--utility::before { background: var(--amber); }
.layer--sailing::before { background: #5f9ad1; }
.layer--conv::before    { background: var(--faint); }
.layer--ai { background: linear-gradient(90deg, rgba(70,224,200,0.07), transparent 70%); }
.layer__name { font-family: var(--display); font-weight: 600; font-size: 1.05rem; }
.layer__desc { color: var(--muted); font-size: 0.9rem; }

/* ============================================================ AI LAYER */
.ai {
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(70,224,200,0.06), transparent 60%),
    var(--ink);
}
.ai__grid {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(4rem, 10vh, 7rem) var(--pad);
  display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(2rem, 5vw, 4rem);
  grid-template-areas: "intro specs" "wide wide";
}
.ai__intro { grid-area: intro; }
.ai__intro p { margin-top: 1.1rem; color: var(--muted); }
.ai__specs { grid-area: specs; list-style: none; display: grid; gap: 0; align-self: start; }
.ai__specs li { padding: 1.1rem 0; border-top: 1px solid var(--line); }
.ai__specs li:first-child { border-top: none; }
.ai__specs .mono { color: var(--aqua); }
.ai__specs p { color: var(--muted); font-size: 0.95rem; margin-top: 0.35rem; }

/* ============================================================ placeholders */
.placeholder {
  position: relative; display: grid; place-items: center;
  border: 1px dashed var(--line); border-radius: 4px;
  background:
    repeating-linear-gradient(45deg, rgba(255,255,255,0.012) 0 12px, transparent 12px 24px),
    var(--bg-2);
  color: var(--faint); min-height: 220px;
}
.placeholder::after {
  content: attr(data-spec) " px";
  position: absolute; top: 0.7rem; right: 0.8rem;
  font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.1em; color: var(--faint);
}
.placeholder__label { text-align: center; padding: 0 1rem; color: var(--muted); }
.placeholder--wide { grid-area: wide; aspect-ratio: 16 / 10; min-height: 0; }
.placeholder--tall { aspect-ratio: 9 / 11; }
.placeholder--screen { aspect-ratio: 4 / 3; }

/* ============================================================ DIGITAL TWIN */
.twin {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(4rem, 10vh, 7rem) var(--pad);
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.twin__copy p { color: var(--muted); margin-top: 1.1rem; max-width: 46ch; }
.twin__tags { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.75rem; }
.chip {
  border: 1px solid var(--line); color: var(--muted);
  padding: 0.4rem 0.7rem; border-radius: 2px; background: var(--bg-2);
}

/* ============================================================ POWER */
.power {
  border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--ink), var(--bg));
}
.power__headline,
.power__stats { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--pad); }
.power__headline { padding-top: clamp(4rem, 9vh, 6rem); }
.power__headline h2 { display: flex; align-items: baseline; gap: 0.6rem; margin-top: 0.5rem; }
.bignum {
  font-family: var(--display); font-weight: 800;
  font-size: clamp(5rem, 18vw, 13rem); line-height: 0.85; letter-spacing: -0.04em;
  background: linear-gradient(180deg, var(--text), var(--amber));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.unit { font-family: var(--mono); font-size: clamp(1rem, 2vw, 1.6rem); color: var(--amber); text-transform: uppercase; letter-spacing: 0.1em; }
.power__headline p { color: var(--muted); margin-top: 1rem; max-width: 48ch; }
.power__stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: var(--line-soft);
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding-bottom: clamp(4rem, 9vh, 6rem);
  padding-inline: 0;
  max-width: calc(var(--maxw) - 2 * var(--pad));
  margin-inline: auto;
}
.power__stats > div { background: var(--bg); padding: 1.3rem 1.1rem; }
.power__stats dt { color: var(--amber); margin-bottom: 0.4rem; }
.power__stats dd { font-family: var(--display); font-weight: 600; font-size: 1.25rem; }

/* ============================================================ SCREENS */
.screens { max-width: var(--maxw); margin: 0 auto; padding: clamp(4rem, 10vh, 7rem) var(--pad); }
.screens__layout { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(2rem, 4vw, 3rem); align-items: start; }

.spec-table { border: 1px solid var(--line-soft); border-radius: 4px; overflow: hidden; }
.spec-table__row {
  display: grid; grid-template-columns: 1.4fr 0.7fr 1.1fr 1.1fr;
  gap: 1rem; padding: 0.85rem 1.1rem; align-items: center;
  border-top: 1px solid var(--line-soft); font-size: 0.92rem;
  transition: background 0.2s;
}
.spec-table__row:first-child { border-top: none; }
.spec-table__row--head {
  background: var(--bg-3); font-family: var(--mono);
  font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted);
}
.spec-table__row:not(.spec-table__row--head):hover { background: var(--bg-2); }
.spec-table__row span:first-child { font-weight: 500; color: var(--text); }
.spec-table__row .mono { color: var(--aqua); font-size: 0.78rem; }

.screens__gallery { display: grid; gap: 1.25rem; }

/* ============================================================ CLOSING */
.closing {
  text-align: center; padding: clamp(5rem, 14vh, 9rem) var(--pad);
  border-top: 1px solid var(--line-soft);
}
.closing__line {
  font-family: var(--display); font-weight: 700;
  font-size: clamp(1.8rem, 5vw, 3.4rem); line-height: 1.1; letter-spacing: -0.015em;
}
.closing__line--accent { color: var(--aqua); }
.closing__cta {
  display: inline-block; margin-top: 2.5rem;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); text-decoration: none;
  border: 1px solid var(--line); padding: 0.7rem 1.3rem; border-radius: 2px;
  transition: color 0.2s, border-color 0.2s;
}
.closing__cta:hover { color: var(--aqua); border-color: var(--aqua-deep); }

/* ============================================================ FOOTER */
.foot {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem;
  padding: 2rem var(--pad); border-top: 1px solid var(--line-soft);
  color: var(--faint);
}
.foot__brand { display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.foot__brand .nav__mark { font-size: 1.1rem; }
.foot__note { max-width: 40ch; }

/* ============================================================ RESPONSIVE */
@media (max-width: 880px) {
  .nav__links { display: none; }
  .manifesto,
  .ai__grid,
  .twin,
  .screens__layout { grid-template-columns: 1fr; }
  .ai__grid { grid-template-areas: "intro" "specs" "wide"; }
  .modules { grid-template-columns: 1fr; }
  .power__stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .hero__caption { display: none; }
  .power__stats { grid-template-columns: 1fr; }
  .spec-table__row { grid-template-columns: 1fr; gap: 0.2rem; }
  .spec-table__row--head { display: none; }
  .spec-table__row span::before {
    content: attr(data-k) "  ";
    font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.08em;
    text-transform: uppercase; color: var(--faint);
  }
  .spec-table__row span:first-child::before { content: ""; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
}