/* Day chart */
:root {
  --paper: #f2eee3;
  --paper-2: #e9e3d3;
  --ink: #15212e;
  --ink-2: #4c5a68;
  --line: rgba(21, 33, 46, 0.16);
  --contour: 52, 92, 124;
  --shoal: #d3e2e3;
  --land: #e2d5b2;
  --accent: #8a5a12;
  --gold: #b07f1f;
  --green: #2c7a4b;
  --lamp-off: rgba(21, 33, 46, 0.18);
  color-scheme: light;
}

/* Night chart (ECDIS-style: dark, dim, low glare) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #06080b;
    --paper-2: #0c1016;
    --ink: #c8d0d8;
    --ink-2: #7b8794;
    --line: rgba(200, 208, 216, 0.14);
    --contour: 72, 104, 134;
    --shoal: #0b1822;
    --land: #17140e;
    --accent: #d6a24a;
    --gold: #e0ad48;
    --green: #4fb67d;
    --lamp-off: rgba(200, 208, 216, 0.12);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #06080b;
  --paper-2: #0c1016;
  --ink: #c8d0d8;
  --ink-2: #7b8794;
  --line: rgba(200, 208, 216, 0.14);
  --contour: 72, 104, 134;
  --shoal: #0b1822;
  --land: #17140e;
  --accent: #d6a24a;
  --gold: #e0ad48;
  --green: #4fb67d;
  --lamp-off: rgba(200, 208, 216, 0.12);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: background .4s, color .4s;
}
a { color: inherit; }
h1, h2, h3 { font-family: "Instrument Serif", Georgia, serif; font-weight: 400; line-height: 1.02; margin: 0; letter-spacing: -0.01em; }
em { font-style: italic; color: var(--accent); }
.mono, .eyebrow, .ticks, .readout, .cartouche, .char, .buoy-label, .notice-no, .numeral, .contact-item h3, .nav-links, .link-arrow, .btn {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
}

.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 40px; } }

/* Nav */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; padding: 0 16px; gap: 12px; }
@media (min-width: 720px) { .nav-inner { padding: 0 40px; } }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 400 24px "Instrument Serif", serif; }
.brand-mark { width: 22px; height: 22px; fill: none; stroke: var(--accent); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; }
.nav-links a { text-decoration: none; color: var(--ink-2); }
.nav-links a:hover { color: var(--accent); }
.theme-toggle {
  font: inherit; letter-spacing: inherit; text-transform: inherit; color: var(--ink-2);
  background: none; border: 1px solid var(--line); border-radius: 999px; padding: 5px 11px; cursor: pointer;
}
.theme-toggle .tt-sep { opacity: .4; margin: 0 4px; }
.tt-day { color: var(--ink); }
:root[data-theme="dark"] .tt-day { color: var(--ink-2); }
:root[data-theme="dark"] .tt-night { color: var(--ink); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .tt-day { color: var(--ink-2); }
  :root:not([data-theme="light"]) .tt-night { color: var(--ink); }
}
@media (max-width: 600px) {
  .nav-links a { display: none; }
}

/* Hero chart */
.hero {
  position: relative; min-height: clamp(620px, 100svh, 1000px); overflow: hidden;
  padding: 120px 0 80px;
  display: flex; align-items: center;
  cursor: crosshair;
}
.chart { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.neatline {
  position: absolute; inset: 72px 12px 12px; z-index: 2; pointer-events: none;
  border: 1px solid var(--ink);
  outline: 1px solid var(--ink); outline-offset: 7px;
}
.neatline::before {
  content: ""; position: absolute; inset: -7px;
  border: 6px solid transparent;
  border-image: repeating-linear-gradient(90deg, var(--ink) 0 40px, transparent 40px 80px) 6;
  opacity: .85;
}
@media (min-width: 720px) { .neatline { inset: 80px 24px 24px; } }
.ticks { position: absolute; z-index: 3; display: flex; justify-content: space-around; font-size: 10px; color: var(--ink-2); letter-spacing: .06em; pointer-events: none; }
.ticks-top { top: 58px; left: 24px; right: 24px; }
.ticks-left { left: 0; top: 80px; bottom: 24px; writing-mode: vertical-rl; transform: rotate(180deg); align-items: center; width: 22px; }
@media (max-width: 719px) { .ticks { display: none; } }

.hero-copy { position: relative; z-index: 4; width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 28px; pointer-events: none; }
.hero-copy a { pointer-events: auto; }
@media (min-width: 720px) { .hero-copy { padding: 0 72px; } }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: 0.14em; font-size: 12px; margin: 0 0 18px; }
.hero h1 { font-size: clamp(52px, 9.5vw, 128px); max-width: 12ch; text-shadow: 0 0 18px var(--paper), 0 0 2px var(--paper); }
.lede { font-size: clamp(17px, 2vw, 20px); max-width: 40ch; margin: 26px 0 30px; color: var(--ink-2); text-shadow: 0 0 10px var(--paper), 0 0 2px var(--paper); }
.cta { display: flex; flex-wrap: wrap; gap: 10px 28px; }
.link-arrow {
  font-size: 13px; text-transform: uppercase; letter-spacing: .1em; text-decoration: none;
  padding: 10px 0; border-bottom: 1px solid var(--ink); background: var(--paper);
}
.link-arrow::after { content: " →"; color: var(--accent); transition: margin .2s; }
.link-arrow:hover::after { margin-left: 6px; }

/* Buoys: lit with real light characteristics */
.buoy {
  position: absolute; z-index: 5; display: flex; align-items: center; gap: 10px;
  text-decoration: none; transform: translate(-9px, -9px);
}
.buoy .lamp { width: 18px; height: 18px; }
.buoy-label { display: flex; flex-direction: column; font-size: 11px; line-height: 1.35; background: var(--paper); padding: 3px 7px; border: 1px solid var(--line); }
.buoy-label b { font-weight: 500; color: var(--ink); font-size: 12px; }
.buoy-label i { font-style: normal; color: var(--accent); }
.buoy:hover .buoy-label { border-color: var(--accent); }
@media (max-width: 719px) { .buoy { display: none; } }

.lamp {
  display: inline-block; width: 10px; height: 10px; border-radius: 50%; flex: none;
  background: var(--lamp-off); position: relative;
  box-shadow: 0 0 0 1.5px var(--ink) inset;
}
.lamp-gold, .buoy-gold .lamp { --lamp: var(--gold); animation: fl1 4s infinite; }
.lamp-green, .buoy-green .lamp { --lamp: var(--green); animation: fl2 6s infinite; }
@keyframes fl1 {
  0%, 12% { background: var(--lamp); box-shadow: 0 0 0 1.5px var(--ink) inset, 0 0 16px 4px var(--lamp); }
  14%, 100% { background: var(--lamp-off); box-shadow: 0 0 0 1.5px var(--ink) inset; }
}
@keyframes fl2 {
  0%, 6%, 14%, 20% { background: var(--lamp); box-shadow: 0 0 0 1.5px var(--ink) inset, 0 0 16px 4px var(--lamp); }
  7%, 13%, 21%, 100% { background: var(--lamp-off); box-shadow: 0 0 0 1.5px var(--ink) inset; }
}

.rose { position: absolute; z-index: 3; width: 190px; right: 7%; top: 16%; fill: none; stroke: var(--ink); stroke-width: .8; opacity: .55; pointer-events: none; }
.rose .rose-star { fill: var(--paper); stroke-width: 1; }
.rose .rose-north { fill: var(--accent); stroke: none; }
.rose text { fill: var(--accent); stroke: none; font: 500 11px "IBM Plex Mono", monospace; }
.rose-ticks line { stroke: var(--ink); }
@media (max-width: 719px) { .rose { width: 120px; right: -20px; top: 70px; opacity: .35; } }

.cartouche {
  position: absolute; z-index: 4; right: 48px; bottom: 48px;
  display: flex; flex-direction: column; align-items: center; text-align: center;
  background: var(--paper); border: 1px solid var(--ink); outline: 1px solid var(--ink); outline-offset: 3px;
  padding: 14px 22px; font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); gap: 2px;
}
.cartouche strong { font: 400 26px "Instrument Serif", serif; letter-spacing: 0; text-transform: none; color: var(--ink); margin-bottom: 4px; }
.cartouche .mono { color: var(--accent); margin-top: 4px; }
@media (max-width: 719px) { .cartouche { display: none; } }

.readout {
  position: absolute; z-index: 6; pointer-events: none; display: none; flex-direction: column;
  font-size: 11px; line-height: 1.4; padding: 5px 8px; background: var(--ink); color: var(--paper);
  white-space: nowrap;
}
.readout .ro-depth { color: color-mix(in srgb, var(--paper) 70%, var(--accent)); }
.cross { position: absolute; z-index: 1; pointer-events: none; display: none; background: rgba(var(--contour), .35); }
.cross-x { left: 0; right: 0; height: 1px; }
.cross-y { top: 0; bottom: 0; width: 1px; }
.hero.probing .readout { display: flex; }
.hero.probing .cross { display: block; }

/* Sections */
.section { padding: 112px 0; position: relative; }
.section-alt { background: var(--paper-2); border-block: 1px solid var(--line); }
.section-head { margin-bottom: 56px; max-width: 720px; }
.section h2 { font-size: clamp(42px, 6.5vw, 80px); }
.section-intro { color: var(--ink-2); font-size: 19px; max-width: 46ch; margin: 18px 0 0; }

.notice {
  display: grid; grid-template-columns: 1fr; gap: 24px;
  padding: 44px 0; border-top: 1px solid var(--ink);
}
.notice:last-child { border-bottom: 1px solid var(--ink); }
@media (min-width: 900px) { .notice { grid-template-columns: 110px 1fr 340px; gap: 40px; align-items: start; } }
.notice-no { font-size: 13px; color: var(--accent); letter-spacing: .1em; padding-top: 10px; }
.char { display: flex; align-items: center; gap: 10px; font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-2); margin: 0 0 12px; }
.notice h3 { font-size: clamp(48px, 6vw, 72px); }
.notice-sub { font: italic 400 24px/1.2 "Instrument Serif", serif; color: var(--accent); margin: 6px 0 16px; }
.notice-body > p:not(.char):not(.notice-sub) { color: var(--ink-2); max-width: 54ch; margin: 0 0 20px; }
.specs { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0 0 28px; }
.specs li { font: 400 12px "IBM Plex Mono", monospace; padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px; }
.links { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; text-decoration: none; font-size: 13px; text-transform: uppercase; letter-spacing: .08em;
  padding: 12px 18px; background: var(--ink); color: var(--paper); border: 1px solid var(--ink);
  transition: background .2s, color .2s;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--paper); }
.btn-quiet { background: transparent; color: var(--ink); }

.notice-art { width: 100%; max-width: 420px; height: auto; border: 1px solid var(--line); background: var(--paper); }
.notice-art text { font: 400 11px "IBM Plex Mono", monospace; fill: var(--ink-2); letter-spacing: .06em; }
.art-gold .grid path { stroke: var(--line); fill: none; }
.art-gold .area { fill: color-mix(in srgb, var(--gold) 16%, transparent); }
.art-gold .line { fill: none; stroke: var(--gold); stroke-width: 2.2; stroke-linejoin: round; stroke-dasharray: 520; stroke-dashoffset: 520; }
.art-gold .dot { fill: var(--gold); }
.art-green .track { stroke: var(--ink); stroke-width: 1; stroke-dasharray: 3 5; }
.art-green .snaps circle { fill: var(--paper); stroke: var(--green); stroke-width: 2; }
.art-green .snaps circle:nth-child(3) { fill: var(--green); }
.art-green .restore, .art-green .restore-head { fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; }
.art-green .restore { stroke-dasharray: 260; stroke-dashoffset: 260; }
.art-green .now { fill: var(--green); }
.art-green text.em { fill: var(--accent); font-style: italic; }
.notice.seen .art-gold .line { animation: draw 1.6s ease-out forwards; }
.notice.seen .art-green .restore { animation: draw 1.2s .3s ease-out forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }

.principles { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr; gap: 0; }
@media (min-width: 820px) { .principles { grid-template-columns: repeat(3, 1fr); } }
.principles li { padding: 28px 0; border-top: 1px solid var(--ink); }
@media (min-width: 820px) { .principles li { padding: 28px 32px 0 0; } }
.numeral { display: block; color: var(--accent); font-size: 13px; letter-spacing: .14em; margin-bottom: 18px; }
.principles h3 { font-size: 34px; margin-bottom: 12px; }
.principles p { color: var(--ink-2); margin: 0; }

.contact-grid { display: grid; gap: 0; grid-template-columns: 1fr; border-top: 1px solid var(--ink); }
@media (min-width: 820px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.contact-item { padding: 28px 24px 28px 0; position: relative; }
.contact-item + .contact-item { border-top: 1px solid var(--line); }
@media (min-width: 820px) { .contact-item + .contact-item { border-top: 0; border-left: 1px solid var(--line); padding-left: 28px; } }
.contact-item h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .12em; color: var(--accent); margin-bottom: 14px; }
.contact-item a { font: 400 30px "Instrument Serif", serif; text-decoration: none; border-bottom: 1px solid var(--line); word-break: break-word; }
.contact-item a:hover { border-color: var(--accent); }

.footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--ink-2); font-size: 13px; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; }
.footer .mono { text-transform: uppercase; letter-spacing: .1em; font-size: 11px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .lamp, .buoy .lamp { animation: none !important; background: var(--lamp); }
  .art-gold .line, .art-green .restore { stroke-dashoffset: 0; animation: none !important; }
}