/* ToneSoul Site — Blueprint + Crystalline Aesthetic
   Inspired by: 語魂.pdf final page
   Colors: steel blue on parchment gray, translucent layers */

:root {
  --blue-deep: #3a6b9f;
  --blue-mid: #5a8ec0;
  --blue-light: #b8d4e8;
  --blue-pale: #dce8f2;
  --bg: #eef1f5;
  --bg-card: rgba(255, 255, 255, 0.72);
  --text: #2c3e50;
  --text-muted: #6b7c8d;
  --border: rgba(90, 142, 192, 0.2);
  --grid-line: rgba(90, 142, 192, 0.06);
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.8;
  color: var(--text);
  max-width: 920px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  min-height: 100vh;
}

/* Typography */
h1 {
  font-size: 2.4rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--blue-deep);
}
h1 strong, h1 b { font-weight: 600; }

h2 {
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  margin: 3rem 0 1.2rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--border);
  color: var(--blue-deep);
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 .5rem;
  color: var(--text);
}

p { margin-bottom: 1rem; }

a { color: var(--blue-mid); text-decoration: none; transition: color .2s; }
a:hover { color: var(--blue-deep); text-decoration: underline; }

code {
  background: rgba(90, 142, 192, 0.08);
  padding: .15rem .45rem;
  border-radius: 3px;
  font-size: .88em;
  font-family: 'Cascadia Code', 'Fira Code', monospace;
}

pre {
  background: #1e2d3d;
  color: #d4e4f1;
  padding: 1.3rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid rgba(90, 142, 192, 0.15);
}
pre code { background: none; padding: 0; color: inherit; }

/* Hero */
.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
  margin-bottom: 1rem;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  height: 280px;
  background: radial-gradient(ellipse, rgba(90, 142, 192, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* Crystalline eye symbol — pure CSS */
.crystal-eye {
  width: 120px;
  height: 120px;
  margin: 0 auto 1.5rem;
  position: relative;
}
.crystal-eye::before,
.crystal-eye::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1.5px solid var(--blue-light);
  border-radius: 50%;
}
.crystal-eye::before {
  width: 100px;
  height: 100px;
  transform: translate(-50%, -50%) rotate(45deg);
  border-radius: 0;
}
.crystal-eye::after {
  width: 60px;
  height: 60px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(90, 142, 192, 0.12) 0%, transparent 70%);
}
.crystal-eye .inner {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 80px;
  height: 80px;
  transform: translate(-50%, -50%) rotate(22.5deg);
  border: 1px solid rgba(90, 142, 192, 0.25);
  border-radius: 0;
}
.crystal-eye .dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  transform: translate(-50%, -50%);
  background: var(--blue-mid);
  border-radius: 50%;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 1rem auto;
  letter-spacing: 0.02em;
}

.hero .tagline-zh {
  font-size: 1.6rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  color: var(--blue-deep);
  margin: 1.5rem 0 .5rem;
}

.hero .tagline-sub {
  font-size: .92rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* Badges */
.badge {
  display: inline-block;
  background: rgba(58, 107, 159, 0.1);
  color: var(--blue-deep);
  border: 1px solid var(--border);
  padding: .25rem .7rem;
  border-radius: 20px;
  font-size: .8rem;
  margin: .2rem;
  letter-spacing: 0.03em;
}

/* CTA buttons */
.cta {
  display: inline-block;
  padding: .65rem 1.5rem;
  border-radius: 6px;
  font-weight: 500;
  margin: .5rem .4rem .5rem 0;
  letter-spacing: 0.03em;
  transition: all .2s;
  border: 1px solid transparent;
}
.cta-primary {
  background: var(--blue-deep);
  color: #fff;
}
.cta-primary:hover {
  background: #2d5a8a;
  text-decoration: none;
  color: #fff;
}
.cta-secondary {
  background: var(--bg-card);
  color: var(--blue-deep);
  border-color: var(--border);
}
.cta-secondary:hover {
  background: #fff;
  text-decoration: none;
}

/* Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.2rem;
  margin: 1.5rem 0;
}
.card {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.3rem;
  transition: border-color .2s, box-shadow .2s;
}
.card:hover {
  border-color: var(--blue-light);
  box-shadow: 0 2px 12px rgba(90, 142, 192, 0.1);
}
.card h3 { margin-top: 0; color: var(--blue-deep); }

/* Tables */
table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
th, td {
  text-align: left;
  padding: .65rem .8rem;
  border-bottom: 1px solid var(--border);
}
th {
  font-weight: 500;
  background: rgba(90, 142, 192, 0.05);
  color: var(--blue-deep);
  letter-spacing: 0.02em;
}

/* Blockquote */
blockquote {
  border-left: 3px solid var(--blue-mid);
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0;
  background: rgba(90, 142, 192, 0.04);
  border-radius: 0 6px 6px 0;
}
blockquote strong { color: var(--blue-deep); }

/* Axiom cards (concepts page) */
.axiom {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.3rem;
  margin: 1rem 0;
}
.axiom h3 { margin-top: 0; color: var(--blue-deep); }
.axiom .fol {
  font-family: 'Cascadia Code', 'Fira Code', monospace;
  color: var(--blue-mid);
  font-size: .88rem;
}

/* Step boxes (getting-started page) */
.step {
  border-left: 3px solid var(--blue-mid);
  padding: .9rem 1.3rem;
  margin: 1.5rem 0;
  background: rgba(90, 142, 192, 0.04);
  border-radius: 0 6px 6px 0;
}
.step h3 { margin-top: 0; color: var(--blue-mid); }

.note {
  background: rgba(245, 166, 35, 0.06);
  border-left: 3px solid #d4a056;
  padding: .9rem 1.3rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
}

/* Site Navigation */
.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: .8rem 0;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.site-nav .brand {
  font-weight: 600;
  font-size: 1rem;
  color: var(--blue-deep);
  letter-spacing: 0.06em;
  margin-right: auto;
}
.site-nav a {
  font-size: .88rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  padding: .3rem 0;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
}
.site-nav a:hover, .site-nav a.active {
  color: var(--blue-deep);
  border-bottom-color: var(--blue-mid);
  text-decoration: none;
}

/* Breadcrumb */
.breadcrumb {
  margin-bottom: 2rem;
  font-size: .88rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* Lists */
ul { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: .3rem; }

/* Footer */
footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
}
footer p { color: var(--text-muted); font-size: .85rem; }
footer .philosophy {
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--blue-deep);
  margin-bottom: .8rem;
  font-weight: 300;
}

/* Responsive */
@media (max-width: 600px) {
  body { padding: 1.5rem 1rem; }
  h1 { font-size: 1.8rem; }
  .hero { padding: 2.5rem .5rem 2rem; }
  .hero .tagline-zh { font-size: 1.3rem; }
  .grid { grid-template-columns: 1fr; }
}