/* ===== Japanese-minimal base (Graphpaper / Auralee style) ===== */

:root {
  --content-width: 760px;   /* the centered column width, shared by nav, main, footer */
}

html {
  overscroll-behavior: none;
  background-color: #ffffff;
}

body {
  color: #1a1a1a;
  font-family: "Helvetica Neue", -apple-system, "PingFang SC", Arial, sans-serif;
  font-size: 13px;
  letter-spacing: 0.06em;
  line-height: 1.9;
  margin: 0;
}

/* Fixed full-screen background layer. Using a fixed element (not
   background-attachment: fixed) so it works on phones too. */
body::before {
  content: "";
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-image: url('OceanImageBank_AlexTyrrell_07.jpg');
  background-size: cover;
  background-position: center 30%;
  z-index: -1;
}

/* Sub-pages (rip, jellyfish, trends, guide) use a different background image */
body.subpage::before {
  background-image: url('OceanImageBank_MattCurnock_seagrass_15.jpg');
  background-position: center 10%;
}

main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px 60px;             /* a little breathing room inside the white column */
  background-color: #ffffff;        /* white column floating on the ocean */
}

/* Sub-pages: space at the top of the white area, above the first text */
.subpage main {
  padding-top: 40px;
}

/* ===== Nav — small, quiet, hairline underneath ===== */

nav {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  /* spread brand and links to the left and right edges */
  padding: 18px 50px;
  background-color: #ffffff;
  border-bottom: 1px solid #e8e8e8;
  z-index: 10;
}

.brand {
  font-size: 13px;
  letter-spacing: 0.2em;
}

.nav-links {
  display: flex;
  gap: 28px;
}

nav a {
  color: #1a1a1a;
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.12em;
}

nav a:hover {
  opacity: 0.4;            /* minimal sites fade on hover instead of changing color */
}

/* ===== Hero — the ocean shows through here ===== */

.hero {
  margin: 0;
  padding: 38vh 24px;      /* tall empty space where the background is visible */
}

.hero h1 {
  color: #ffffff;
  font-size: 26px;
  font-weight: 400;        /* minimal sites avoid bold headlines */
  letter-spacing: 0.25em;
  text-align: center;
  margin: 0;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.5);
}

/* ===== Headings ===== */

h2 {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.25em;
  margin: 0;
  padding: 28px 0;
  cursor: pointer;
}

h2::after {
  content: '+';
  float: right;            /* the + sits at the right edge, like Graphpaper's menus */
  color: #999999;
}

h3 {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: #999999;
  margin-top: 40px;
}

.lead {
  font-size: 16px;
  line-height: 1.9;
  color: #1a1a1a;
  border-left: 2px solid #1a1a1a;   /* a quiet accent bar, like a pull-quote */
  padding-left: 20px;
  margin: 40px 0;
}

.analysis {
  color: #333333;
  font-size: 13px;
  line-height: 2;
  background-color: #f7f7f7;        /* faint panel so analysis reads as commentary */
  padding: 24px 28px;
  margin-top: 24px;
}

.cite {
  display: inline-block;
  margin-top: 10px;
  color: #999999;
  font-size: 11px;
  letter-spacing: 0.05em;
}

.methods {
  border-top: 1px solid #e8e8e8;
  padding-top: 20px;
  color: #777777;
  font-size: 12px;
  line-height: 1.9;
}

.methods strong {
  color: #1a1a1a;
  border-bottom: none;             /* override the underlined-strong style here */
}

.methods ul {
  padding-left: 18px;
}

.methods li {
  margin-bottom: 8px;
}

p {
  color: #333333;
  font-size: 14px;
}

ol {
  color: #333333;
  font-size: 14px;
  padding-left: 20px;
}

strong {
  font-weight: 400;
  border-bottom: 1px solid #1a1a1a;   /* underline instead of color for emphasis */
}

/* ===== Title on a sub-page (rip.html, etc.) ===== */

.page-title {
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 0.25em;
  margin: 80px 0 40px;
}

/* ===== "Read more" link at the bottom of an open section ===== */

.more-link {
  display: inline-block;
  margin-top: 30px;
  color: #1a1a1a;
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.2em;
  border-bottom: 1px solid #1a1a1a;
  padding-bottom: 4px;
}

.more-link:hover {
  opacity: 0.4;
}

/* ===== Sections — no cards, just hairlines ===== */

section {
  border-top: 1px solid #e8e8e8;
  margin: 0;
}

section:last-of-type {
  border-bottom: 1px solid #e8e8e8;
}

.section-content {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.5s ease;
}

/* ===== Image slots — space reserved for your photos ===== */

.image-slot {
  background-color: #f4f4f4;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 40px;
}

.image-slot span {
  color: #bbbbbb;
  font-size: 11px;
  letter-spacing: 0.3em;
}

.image-slot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== Stats — plain numbers, no boxes ===== */

.stats {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 60px 0;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
  flex: 1;
}

.big-number {
  display: block;
  font-size: 28px;
  font-weight: 300;        /* thin numbers, not heavy */
  letter-spacing: 0.05em;
  color: #1a1a1a;
}

.label {
  display: block;
  margin-top: 12px;
  color: #999999;
  font-size: 11px;
  letter-spacing: 0.1em;
}

/* ===== Chart ===== */

.video {
  display: block;
  width: 100%;
  margin-top: 30px;
  background-color: #000000;        /* black frame before the video loads */
}

.chart-box {
  height: 380px;
  padding-bottom: 40px;
}

.chart-note {
  font-size: 11px;
  color: #999999;
  margin-top: 0;
}

canvas {
  max-width: 100%;
}

/* ===== Footer — hairline above, tiny text ===== */

footer {
  background-color: #ffffff;
  border-top: 1px solid #e8e8e8;
  /* spread footer columns across the full width */
  padding: 50px;
  margin-top: 140px;                /* transparent gap — the ocean shows through here */
  color: #999999;
  font-size: 11px;
  letter-spacing: 0.1em;

  display: grid;                       /* lay items in a grid */
  grid-template-columns: repeat(4, 1fr);  /* 4 equal columns per row */
  gap: 12px 40px;                      /* 12px between rows, 40px between columns */
  text-align: left;                    /* each item starts at its column's left edge */
}

footer p {
  margin: 0;                        /* remove the default stacking space */
  color: #999999;
  font-size: 11px;
}

/* ===== Phone screens (≤640px) ===== */
@media (max-width: 640px) {
  nav {
    flex-direction: column;         /* brand on top, links below */
    gap: 12px;
    padding: 14px 20px;
  }

  .nav-links {
    gap: 18px;
    flex-wrap: wrap;                /* links wrap instead of overflowing */
    justify-content: center;
  }

  main {
    padding: 0 20px 40px;
  }

  .hero {
    padding: 30vh 20px;
  }

  .hero h1 {
    font-size: 18px;
    letter-spacing: 0.15em;
  }

  .stats {
    gap: 10px;                      /* keep all three in one row */
    padding: 36px 0;
  }

  .big-number {
    font-size: 20px;                /* shrink so three fit across a phone */
  }

  .label {
    font-size: 10px;
    letter-spacing: 0.04em;
  }

  .lead {
    font-size: 14px;
  }

  .analysis {
    padding: 18px 20px;
  }

  .chart-box {
    height: 300px;
  }

  .page-title {
    margin: 50px 0 30px;
  }

  .image-slot {
    height: 220px;
  }

  footer {
    grid-template-columns: 1fr;     /* one column — everything stacks */
    text-align: center;
    margin-top: 0;                  /* no gap — footer sits right after content */
    padding: 40px 24px;             /* tighter edges so text fits on a phone */
  }

}

/* ===== Sub-pages on laptop/monitor: shorter hero, content starts sooner ===== */
@media (min-width: 641px) {
  .subpage .hero {
    padding: 26vh 24px;             /* was 38vh — smaller gap between header and body */
  }
}

/* ===== Wide screens (≥1728px) — bigger than a MacBook Air, i.e. external monitors ===== */
@media (min-width: 1728px) {
  main {
    max-width: 1100px;              /* wider content / buttons section */
  }

  body {
    font-size: 14px;                /* nudge type up so it doesn't feel tiny */
  }

  .big-number {
    font-size: 32px;
  }
}