/* happyseaurchin.com — design system
   Palette derived from the particle torus: deep navy, luminous steel-blue, ice-bright */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,500;0,600;1,300&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
  /* torus palette — high contrast for daylight readability */
  --bg-deep:       #080e18;
  --bg-surface:    #0c1525;
  --bg-raised:     #112035;
  --text-primary:  #e8eef4;
  --text-secondary:#a0b8cc;
  --text-dim:      #5a7a94;
  --torus-blue:    #0e87f0;
  --torus-glow:    #4aa8e8;
  --torus-ice:     #e0f0ff;

  /* project accents */
  --accent-hermitcrab: #b07840;
  --accent-machus:     #9b88ce;
  --accent-onen:       #5eead4;
  --accent-xstream:    #4a8ab5;
  --accent-mindflow:   #7ebc8a;
  --accent-play:       #e87e5a;

  --max-w: 960px;
  --font-heading: 'Cormorant Garamond', serif;
  --font-body: 'JetBrains Mono', monospace;
}

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

html { font-size: 18px; scroll-behavior: smooth; }

body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--torus-glow); text-decoration: none; }
a:hover { color: var(--torus-ice); }

/* ── hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 40%, rgba(14,135,240,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-torus {
  width: 180px;
  height: 180px;
  margin-bottom: 2rem;
  opacity: 0.85;
  filter: brightness(1.1);
  transition: opacity 0.4s;
}
.hero-torus:hover { opacity: 1; filter: brightness(1.3); }

.hero h1 {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 3.5rem;
  letter-spacing: 0.04em;
  color: var(--torus-ice);
  margin-bottom: 0.5rem;
}

.hero .subtitle {
  font-family: var(--font-heading);
  font-weight: 300;
  font-style: italic;
  font-size: 1.4rem;
  color: var(--text-secondary);
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  animation: pulse-down 2s ease-in-out infinite;
}
.scroll-hint::after {
  content: '\2193';
  display: block;
  text-align: center;
  margin-top: 0.3rem;
}

@keyframes pulse-down {
  0%, 100% { opacity: 0.4; transform: translateY(0); }
  50% { opacity: 0.8; transform: translateY(4px); }
}

/* ── mode chooser (landing hero) ── */
.mode-chooser {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.mode-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 1.5rem;
  border: 1px solid var(--bg-raised);
  border-radius: 6px;
  transition: all 0.3s;
  color: var(--text-secondary);
  min-width: 140px;
}
.mode-option:hover {
  border-color: var(--torus-blue);
  color: var(--torus-ice);
  transform: translateY(-2px);
}

.mode-label {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.3rem;
  letter-spacing: 0.05em;
}

.mode-desc {
  font-family: var(--font-body);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 0.25rem;
}
.mode-option:hover .mode-desc { color: var(--text-secondary); }

.mode-divider {
  width: 1px;
  height: 2.5rem;
  background: var(--bg-raised);
}

/* ── mode switch (sub-page link back) ── */
.mode-switch {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  border: 1px solid var(--bg-raised);
  padding: 0.35rem 0.9rem;
  border-radius: 3px;
  transition: all 0.3s;
  position: absolute;
  top: 2rem;
  right: 2rem;
}
.mode-switch:hover {
  color: var(--torus-glow);
  border-color: var(--torus-glow);
}

/* ── section divider ── */
.section-divider {
  display: block;
  width: 36px;
  height: 36px;
  margin: 0 auto;
  opacity: 0.7;
}

/* ── sections ── */
section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.section-label {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* ── project cards ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.card {
  display: block;
  background: var(--bg-surface);
  border: 1px solid transparent;
  border-left: 3px solid var(--card-accent, var(--text-dim));
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
  transition: transform 0.2s, border-color 0.3s, background 0.3s;
  color: var(--text-primary);
}
.card:hover {
  transform: translateY(-2px);
  background: var(--bg-raised);
  border-color: var(--card-accent, var(--text-dim));
  color: var(--text-primary);
}

.card h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  color: var(--torus-ice);
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.card .tag {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  margin-top: 0.75rem;
  border-radius: 3px;
  border: 1px solid var(--card-accent, var(--text-dim));
  color: var(--card-accent, var(--text-dim));
}

/* ── links list ── */
.links-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
}
.links-list li a {
  font-size: 1rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.links-list li a:hover { color: var(--torus-ice); }
.links-list li a::before {
  content: '\2192\00a0';
  color: var(--text-dim);
}

/* ── byok ── */
.vault-section {
  border-top: 1px solid var(--bg-raised);
  padding-top: 3rem;
}

.vault-toggle {
  background: none;
  border: 1px solid var(--text-dim);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.vault-toggle:hover { border-color: var(--torus-glow); color: var(--torus-glow); }

.vault-panel {
  display: none;
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-surface);
  border-radius: 6px;
  max-width: 420px;
}
.vault-panel.open { display: block; }

.vault-panel label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 0.4rem;
}

.vault-panel input[type="password"] {
  width: 100%;
  background: var(--bg-deep);
  border: 1px solid var(--bg-raised);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.7rem 1rem;
  border-radius: 4px;
  outline: none;
}
.vault-panel input[type="password"]:focus {
  border-color: var(--torus-blue);
}

.vault-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.vault-actions button {
  background: var(--bg-raised);
  border: 1px solid var(--text-dim);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.55rem 1.25rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.vault-actions button:hover {
  border-color: var(--torus-glow);
  color: var(--torus-glow);
}
.vault-actions button.primary {
  background: var(--torus-blue);
  border-color: var(--torus-blue);
  color: #fff;
}
.vault-actions button.primary:hover {
  background: var(--torus-glow);
  border-color: var(--torus-glow);
}

.vault-status {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 0.75rem;
}
.vault-status.has-key { color: var(--accent-mindflow); }

/* ── footer ── */
footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  border-top: 1px solid var(--bg-raised);
  font-size: 0.85rem;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
footer a { color: var(--text-dim); }
footer a:hover { color: var(--text-secondary); }

/* ── responsive ── */
@media (max-width: 640px) {
  .card-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2.5rem; }
  .hero .subtitle { font-size: 1.1rem; }
  .hero-torus { width: 120px; height: 120px; }
  footer { flex-direction: column; gap: 0.5rem; text-align: center; }
}