/* ==========================================================================
   Dr. Yogesh Suradkar — Design System
   Obsidian / Ivory / Champagne, Fraunces + Inter + IBM Plex Mono
   ========================================================================== */

:root {
  --obsidian: #0b0c10;
  --surface: #15171d;
  --surface-2: #1c1f27;
  --ivory: #f4f1e9;
  --platinum: #a6acb6;
  --platinum-dim: #6c727d;
  --champagne: #c9a24a;
  --champagne-soft: rgba(201, 162, 74, 0.16);
  --plum: #362b45;
  --line: rgba(244, 241, 233, 0.1);
  --radius: 2px;
  --container: 1180px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --space-7: 140px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--obsidian);
  color: var(--ivory);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-3);
  color: var(--ivory);
}

h1 { font-size: clamp(2.4rem, 5.5vw, 4.4rem); font-weight: 480; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.7rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.55rem); font-weight: 600; }

p { margin: 0 0 var(--space-3); color: var(--platinum); max-width: 62ch; }
a { color: inherit; text-decoration: none; }

.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--champagne);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--champagne);
  display: inline-block;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

section { padding: var(--space-6) 0; position: relative; }
@media (max-width: 680px) { section { padding: var(--space-5) 0; } }

.section-head { max-width: 700px; margin-bottom: var(--space-5); }
.section-head p { font-size: 1.08rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 15px 28px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s var(--ease);
  white-space: nowrap;
}

.btn-primary { background: var(--champagne); color: var(--obsidian); }
.btn-primary:hover { background: #dcb45f; transform: translateY(-1px); }

.btn-ghost { border-color: var(--line); color: var(--ivory); }
.btn-ghost:hover { border-color: var(--champagne); color: var(--champagne); }

.btn-row { display: flex; gap: var(--space-2); flex-wrap: wrap; align-items: center; }

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(11, 12, 16, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand { font-family: 'Fraunces', serif; font-size: 1.05rem; color: var(--ivory); letter-spacing: -0.01em; }
.brand span { color: var(--champagne); }

.nav-links { display: flex; gap: var(--space-4); align-items: center; }
.nav-links a {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--platinum);
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--champagne); }
.nav-cta { display: none; }
@media (min-width: 860px) { .nav-cta { display: inline-flex; } }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--ivory);
  width: 42px; height: 42px;
  border-radius: var(--radius);
  cursor: pointer;
}
@media (max-width: 859px) {
  .nav-toggle { display: block; }
  .nav-links { display: none; }
}

.nav-links.open {
  display: flex;
  position: absolute;
  top: 100%; left: 0; right: 0;
  background: var(--surface);
  flex-direction: column;
  padding: var(--space-3);
  border-bottom: 1px solid var(--line);
  gap: var(--space-3);
}

/* ---------- Hero ---------- */
.hero {
  padding: 170px 0 var(--space-6);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: var(--space-6);
  align-items: end;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: var(--space-4); } }

.hero h1 { max-width: 14ch; }
.hero .lede { font-size: 1.18rem; max-width: 46ch; color: var(--ivory); opacity: 0.85; }

.hero-stats {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  border-left: 1px solid var(--line);
  padding-left: var(--space-4);
}
@media (max-width: 900px) { .hero-stats { border-left: none; padding-left: 0; border-top: 1px solid var(--line); padding-top: var(--space-3); flex-direction: row; flex-wrap: wrap; } }

.stat-num { font-family: 'IBM Plex Mono', monospace; font-size: 1.9rem; color: var(--champagne); display: block; }
.stat-label { font-size: 0.82rem; color: var(--platinum-dim); text-transform: uppercase; letter-spacing: 0.04em; }

/* ---------- Coherence Line (signature element) ---------- */
.coherence-line {
  height: 46px;
  overflow: hidden;
  position: relative;
  margin: 0 auto;
  opacity: 0.55;
}
.coherence-line svg {
  position: absolute;
  top: 0; left: 0;
  height: 100%;
  width: 200%;
  animation: driftWave 16s linear infinite;
}
@keyframes driftWave { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- Cards / Grid ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
@media (max-width: 900px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
  transition: border-color 0.3s;
}
.card:hover { border-color: rgba(201, 162, 74, 0.4); }
.card .eyebrow { margin-bottom: var(--space-2); }
.card h3 { margin-bottom: var(--space-2); }
.card p { font-size: 0.96rem; margin-bottom: var(--space-2); }
.card a.card-link { font-family: 'IBM Plex Mono', monospace; font-size: 0.78rem; text-transform: uppercase; color: var(--champagne); letter-spacing: 0.04em; }

/* ---------- Pricing ---------- */
.price-card {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: var(--space-4);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.price-card.featured { border-color: var(--champagne); background: linear-gradient(180deg, var(--surface-2), var(--surface)); }
.price-tag { font-family: 'IBM Plex Mono', monospace; font-size: 2rem; color: var(--champagne); }
.price-tag small { font-size: 0.9rem; color: var(--platinum-dim); font-family: 'Inter', sans-serif; }
.price-list { list-style: none; padding: 0; margin: 0 0 var(--space-2); font-size: 0.92rem; color: var(--platinum); }
.price-list li { padding: 6px 0; border-top: 1px solid var(--line); }
.price-list li:first-child { border-top: none; }

/* ---------- Table ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; min-width: 620px; }
th, td { text-align: left; padding: 18px 20px; border-bottom: 1px solid var(--line); font-size: 0.94rem; vertical-align: top; }
th { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--champagne); background: var(--surface); }
td { color: var(--platinum); }
tr:last-child td { border-bottom: none; }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2); }
@media (max-width: 700px) { .form-grid { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--space-2); }
.field.full { grid-column: 1 / -1; }
.field label { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--platinum-dim); }
.field input, .field select, .field textarea {
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--ivory);
  padding: 13px 14px;
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--champagne);
}
.field textarea { resize: vertical; min-height: 110px; }
.form-note { font-size: 0.85rem; color: var(--platinum-dim); margin-top: var(--space-2); }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--line); padding: var(--space-3) 0; }
.faq-q {
  display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; font-family: 'Fraunces', serif; font-size: 1.05rem; color: var(--ivory);
}
.faq-q::after { content: '+'; font-family: 'IBM Plex Mono', monospace; color: var(--champagne); font-size: 1.3rem; transition: transform 0.3s; }
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s var(--ease); }
.faq-item.open .faq-a { max-height: 300px; }
.faq-a p { padding-top: var(--space-2); font-size: 0.95rem; }

/* ---------- Callout ---------- */
.callout {
  background: linear-gradient(135deg, var(--surface-2), var(--plum) 180%);
  border: 1px solid var(--champagne-soft);
  border-radius: var(--radius);
  padding: var(--space-5);
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: var(--space-5) 0 var(--space-4);
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: var(--space-4); margin-bottom: var(--space-4); }
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-col h4 { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--champagne); margin-bottom: var(--space-2); }
.footer-col a, .footer-col p { display: block; color: var(--platinum); font-size: 0.92rem; margin-bottom: 8px; }
.footer-col a:hover { color: var(--champagne); }
.footer-bottom { border-top: 1px solid var(--line); padding-top: var(--space-3); font-size: 0.82rem; color: var(--platinum-dim); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- Utility ---------- */
.tag {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--champagne);
  border: 1px solid var(--champagne-soft);
  padding: 4px 10px;
  border-radius: var(--radius);
  margin-bottom: var(--space-2);
}
.center { text-align: center; margin-left: auto; margin-right: auto; }
.mt-0 { margin-top: 0; }