/* ============================================
   DiveMesh — Deep Ocean Editorial Theme
   Playfair Display + Lora + DM Mono
   ============================================ */

:root {
  --ocean-deep:    #060d1a;
  --ocean-mid:     #0a1628;
  --ocean-surface: #0e1f38;
  --ocean-light:   #162840;
  --biolum:        #00d4aa;
  --biolum-dim:    #00a882;
  --biolum-glow:   rgba(0, 212, 170, 0.12);
  --sand:          #c9b99a;
  --sand-dim:      #8a7a68;
  --text-primary:  #e8e2d9;
  --text-secondary:#9ba8b8;
  --text-dim:      #5a6a7a;
  --border:        rgba(255,255,255,0.07);
  --border-accent: rgba(0, 212, 170, 0.2);
  --success-bg:    rgba(0, 212, 170, 0.04);
  --fail-bg:       rgba(180, 60, 60, 0.06);
  --fail-accent:   #c0504a;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--ocean-deep);
  color: var(--text-primary);
  font-family: 'Lora', Georgia, serif;
  font-size: 17px;
  line-height: 1.8;
  overflow-x: hidden;
}

/* ── Ocean animated background ── */
.ocean-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 80%, rgba(0,80,120,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(0,40,80,0.15) 0%, transparent 70%),
    linear-gradient(180deg, #060d1a 0%, #0a1628 40%, #071220 100%);
}

.bubble {
  position: absolute;
  bottom: -20px;
  left: var(--x);
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  background: rgba(0, 212, 170, 0.25);
  animation: rise var(--duration) var(--delay) infinite ease-in;
}

@keyframes rise {
  0%   { transform: translateY(0) translateX(0); opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 0.4; }
  100% { transform: translateY(-100vh) translateX(20px); opacity: 0; }
}

/* ── Header ── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  background: rgba(6, 13, 26, 0.7);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.logo-mark {
  color: var(--biolum);
  font-size: 1.1rem;
}

.logo-text {
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

nav {
  display: flex;
  gap: 2rem;
}

nav a {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

nav a:hover { color: var(--biolum); }

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 2rem 4rem;
  max-width: 1100px;
  margin: 0 auto;
  overflow: hidden;
}

.hero-depth-lines {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 340px;
  display: flex;
  gap: 28px;
  padding: 0 2rem;
  align-items: stretch;
  pointer-events: none;
}

.hero-depth-lines span {
  flex: 1;
  border-left: 1px solid var(--border);
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
}

.hero-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--biolum);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.hero h1 em {
  font-style: italic;
  color: var(--biolum);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 2.5rem;
  max-width: 520px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  font-weight: 300;
  color: var(--text-dim);
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.meta-label {
  display: block;
  color: var(--sand-dim);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.hero-diver {
  position: absolute;
  right: 80px;
  top: 50%;
  transform: translateY(-50%);
  width: 160px;
  opacity: 0.75;
  animation: floatDiver 6s ease-in-out infinite;
}

@keyframes floatDiver {
  0%, 100% { transform: translateY(-50%); }
  50%       { transform: translateY(calc(-50% - 10px)); }
}

.signal-ring { transform-origin: 60px 4px; }
.r1 { animation: signalPulse 2.5s 0s ease-out infinite; }
.r2 { animation: signalPulse 2.5s 0.4s ease-out infinite; }
.r3 { animation: signalPulse 2.5s 0.8s ease-out infinite; }

@keyframes signalPulse {
  0%   { opacity: 0.4; transform: scale(0.8); }
  100% { opacity: 0; transform: scale(1.4); }
}

/* ── Content wrapper ── */
.content-wrapper {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
}

/* ── Article sections ── */
.article-section {
  margin-bottom: 6rem;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

/* JS adds .js-ready to body before animating — content always visible without JS */
body.js-ready .article-section.fade-in {
  opacity: 0;
  transform: translateY(24px);
}

body.js-ready .article-section.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-tag {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--biolum);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-tag::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-accent);
  max-width: 80px;
}

h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  line-height: 1.25;
}

h3 {
  font-family: 'Playfair Display', serif;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 2rem 0 0.75rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

p:last-child { margin-bottom: 0; }

a {
  color: var(--biolum);
  text-decoration: none;
  border-bottom: 1px solid var(--border-accent);
  transition: border-color 0.2s, color 0.2s;
}

a:hover {
  color: #33e5c0;
  border-color: var(--biolum);
}

blockquote {
  border-left: 2px solid var(--biolum);
  padding: 1.25rem 1.75rem;
  margin: 2.5rem 0;
  background: var(--biolum-glow);
  border-radius: 0 6px 6px 0;
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 1.15rem;
  color: var(--text-primary);
  line-height: 1.65;
}

/* ── Callout grid ── */
.callout-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 2.5rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--border);
}

.callout-card {
  background: var(--ocean-mid);
  padding: 1.5rem;
  transition: background 0.2s;
}

.callout-card:hover { background: var(--ocean-surface); }

.callout-icon {
  font-size: 1.4rem;
  color: var(--biolum);
  margin-bottom: 0.75rem;
  display: block;
}

.callout-card h4 {
  font-family: 'Playfair Display', serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.callout-card p {
  font-size: 0.88rem;
  line-height: 1.6;
  margin: 0;
}

/* ── Hardware stack ── */
.hardware-stack {
  margin: 2.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--border);
}

.hardware-item {
  display: flex;
  gap: 0;
  background: var(--ocean-mid);
  transition: background 0.2s;
}

.hardware-item:hover { background: var(--ocean-surface); }

.hw-number {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--biolum);
  letter-spacing: 0.1em;
  padding: 1.75rem 1.25rem;
  border-right: 1px solid var(--border);
  min-width: 60px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.hw-body {
  padding: 1.75rem;
  flex: 1;
}

.hw-body h3 {
  margin-top: 0;
  font-size: 1rem;
}

.hw-body p {
  font-size: 0.9rem;
  line-height: 1.7;
}

.hw-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.hw-specs span {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--biolum);
  background: var(--biolum-glow);
  border: 1px solid var(--border-accent);
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
}

/* ── Assumption list ── */
.assumption-list {
  list-style: none;
  margin: 1.5rem 0;
  counter-reset: assumptions;
}

.assumption-list li {
  counter-increment: assumptions;
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.95rem;
  align-items: flex-start;
}

.assumption-list li::before {
  content: counter(assumptions, decimal-leading-zero);
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  color: var(--biolum);
  min-width: 28px;
  margin-top: 0.3rem;
}

/* ── Result blocks ── */
.result-block {
  border-radius: 8px;
  padding: 2rem 2rem 2rem;
  margin: 2rem 0;
  border: 1px solid;
}

.result-block.success {
  background: var(--success-bg);
  border-color: var(--border-accent);
}

.result-block.failure {
  background: var(--fail-bg);
  border-color: rgba(192, 80, 74, 0.2);
}

.result-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.result-block.success .result-label { color: var(--biolum); }
.result-block.failure .result-label { color: var(--fail-accent); }

/* ── Node discoveries ── */
.node-discoveries {
  margin: 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: var(--border);
}

.node-item {
  background: var(--ocean-deep);
  padding: 1rem 1.25rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.node-loc {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--biolum);
  min-width: 160px;
  font-weight: 400;
  padding-top: 0.1rem;
}

.node-detail {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Next grid ── */
.next-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 2rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--border);
}

.next-item {
  background: var(--ocean-mid);
  padding: 1.75rem;
  transition: background 0.2s;
}

.next-item:hover { background: var(--ocean-surface); }

.next-item h4 {
  font-family: 'Playfair Display', serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.next-item p {
  font-size: 0.88rem;
  line-height: 1.65;
  margin: 0;
}

/* ── Closing ── */
.closing { border-top: 1px solid var(--border); padding-top: 4rem; }

.cost-callout {
  margin: 2.5rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.cost-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  gap: 2rem;
}

.cost-item:last-child { border-bottom: none; }

.cost-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.cost-value {
  font-family: 'DM Mono', monospace;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--biolum);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.closing-line {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 1.1rem;
  color: var(--text-primary);
  line-height: 1.7;
  margin: 2rem 0;
}

.open-source-note {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 1rem 1.25rem;
  border-radius: 6px;
  margin-top: 2rem;
}

/* ── Footer ── */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 2rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  font-weight: 300;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

.footer-inner .logo-text {
  font-family: 'Playfair Display', serif;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ── Prototype photo grid ── */
.photo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.photo-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--ocean-mid);
  display: flex;
  flex-direction: column;
}

.photo-wrap {
  aspect-ratio: 3/4;
  overflow: hidden;
  background: var(--ocean-deep);
}

.photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
  transition: transform 0.5s ease;
  filter: brightness(0.92) contrast(1.05);
}

.photo-card:hover .photo-wrap img {
  transform: scale(1.03);
}

figcaption {
  padding: 1.25rem 1.25rem 1.5rem;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
}

.fig-label {
  display: block;
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--biolum);
  margin-bottom: 0.5rem;
}

/* ── Responsive ── */
@media (max-width: 680px) {
  nav { display: none; }
  .hero { padding: 7rem 1.5rem 3rem; min-height: auto; }
  .hero-diver { display: none; }
  .photo-grid { grid-template-columns: 1fr; }
  .photo-wrap { aspect-ratio: 4/3; }
  .callout-grid { grid-template-columns: 1fr; }
  .next-grid { grid-template-columns: 1fr; }
  .content-wrapper { padding: 0 1.5rem 4rem; }
  .node-item { flex-direction: column; gap: 0.4rem; }
  .node-loc { min-width: auto; }
  .cost-item { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
  .footer-inner { flex-direction: column; gap: 0.5rem; text-align: center; }
}