/* ============================================================
   Tattva Partners — design tokens
   Concept: "signal over noise" — the firm's own words for its
   philosophy become the visual system. A thin oscilloscope-style
   signal line is the recurring signature device; ledger-style
   mono labels stand in for the numbered-list default.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --ink: #14181F;
  --ink-2: #1C222C;
  --paper: #EFEDE5;
  --paper-2: #E4E0D4;
  --text-ink: #1B1F27;
  --text-paper: #F4F2EC;
  --muted-on-paper: #6B6E68;
  --muted-on-ink: #9BA0A6;
  --accent: #2F6F6B;
  --accent-bright: #49948F;
  --brass: #A9834F;
  --line-on-paper: rgba(27, 31, 39, 0.14);
  --line-on-ink: rgba(244, 242, 236, 0.16);

  --serif: 'Fraunces', Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;

  --max: 1120px;
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text-ink);
  background: var(--paper);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Signal line signature device ---------- */
.signal {
  width: 100%;
  height: 28px;
  display: block;
  overflow: visible;
}
.signal path {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-dasharray: 600;
  stroke-dashoffset: 600;
  animation: draw 1.6s ease-out forwards;
}
@keyframes draw {
  to { stroke-dashoffset: 0; }
}
.signal.static path { animation: none; stroke-dashoffset: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(239, 237, 229, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-on-paper);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 4px;
  background: var(--ink);
  color: var(--text-paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  border: 1px solid rgba(255,255,255,0.16);
}
.brand-name {
  font-size: 20px;
  letter-spacing: -0.02em;
}

nav.main-nav {
  display: flex;
  gap: 36px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
nav.main-nav a {
  color: var(--muted-on-paper);
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
nav.main-nav a:hover,
nav.main-nav a[aria-current="page"] {
  color: var(--text-ink);
  border-color: var(--accent);
}
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-on-paper);
  border-radius: 4px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: '';
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text-ink);
  position: relative;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

@media (max-width: 780px) {
  nav.main-nav {
    position: fixed;
    inset: 76px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    gap: 0;
    padding: 8px 32px 24px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
  }
  nav.main-nav.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  nav.main-nav a {
    padding: 16px 0;
    border-bottom: 1px solid var(--line-on-paper);
    font-size: 13px;
  }
  .nav-toggle { display: flex; }
}

/* ---------- Sections ---------- */
section { padding: 96px 0; }
@media (max-width: 780px) { section { padding: 64px 0; } }

.on-ink { background: var(--ink); color: var(--text-paper); }
.on-ink .muted, .on-ink p { color: var(--muted-on-ink); }
.on-paper-2 { background: var(--paper-2); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brass);
  display: block;
  margin-bottom: 16px;
}
.on-ink .eyebrow { color: var(--brass); }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.12; margin: 0; }
h1 { font-size: clamp(40px, 6vw, 76px); letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 3.6vw, 42px); letter-spacing: -0.01em; }
h3 { font-size: 20px; font-weight: 600; }

p { margin: 0; color: var(--muted-on-paper); }
p.lede { font-size: 19px; line-height: 1.6; max-width: 640px; }

.center { text-align: center; margin-left: auto; margin-right: auto; }

/* ---------- Hero ---------- */
.hero {
  padding-top: 120px;
  padding-bottom: 96px;
  text-align: center;
}
.hero .eyebrow { text-align: center; }
.hero h1 { margin-bottom: 20px; }
.hero p.lede { margin: 0 auto 40px; text-align: center; }
.hero .signal { max-width: 360px; margin: 0 auto 36px; color: var(--accent); }

.btn-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  padding: 14px 26px;
  border-radius: 3px;
  display: inline-block;
  border: 1px solid var(--ink);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn-solid { background: var(--ink); color: var(--text-paper); }
.btn-solid:hover { background: var(--accent); border-color: var(--accent); }
.btn-outline { background: transparent; color: var(--text-ink); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.on-ink .btn-outline { border-color: var(--line-on-ink); color: var(--text-paper); }
.on-ink .btn-outline:hover { border-color: var(--accent-bright); color: var(--accent-bright); }

/* ---------- Grids / cards ---------- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--paper);
  border: 1px solid var(--line-on-paper);
  border-radius: 4px;
  padding: 32px;
}
.on-paper-2 .card { background: var(--paper); }
.on-ink .card { background: var(--ink-2); border-color: var(--line-on-ink); }
.card h3 { margin-bottom: 10px; }
.card p { font-size: 15px; }

.section-head { max-width: 640px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- Divider between stacked sections ---------- */
.divider-wrap { color: var(--line-on-paper); }
.on-ink + .divider-wrap, .divider-wrap.on-ink-edge { color: var(--line-on-ink); }

/* ---------- Research / list cards ---------- */
.pub-card {
  display: block;
  padding: 28px 0;
  border-bottom: 1px solid var(--line-on-paper);
}
.on-ink .pub-card { border-color: var(--line-on-ink); }
.pub-meta {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brass);
  display: flex;
  gap: 14px;
  margin-bottom: 10px;
}
.pub-card h3 { margin-bottom: 8px; }
.pub-card p { font-size: 15px; max-width: 620px; }

.filter-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 40px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.filter-pill {
  border: 1px solid var(--line-on-paper);
  border-radius: 20px;
  padding: 8px 16px;
  cursor: pointer;
  background: transparent;
  color: var(--muted-on-paper);
}
.filter-pill[aria-pressed="true"] { background: var(--ink); color: var(--text-paper); border-color: var(--ink); }

/* ---------- Team / leadership ---------- */
.person {
  display: flex;
  gap: 28px;
  align-items: flex-start;
}
.person-avatar {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--text-paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 26px;
  flex-shrink: 0;
}
.person h3 { margin-bottom: 4px; }
.person .role { font-family: var(--mono); font-size: 12px; color: var(--brass); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 14px; display: block; }
@media (max-width: 600px) {
  .person { flex-direction: column; }
}

/* ---------- Values list (ledger style, replaces numbered defaults) ---------- */
.ledger { border-top: 1px solid var(--line-on-paper); }
.on-ink .ledger { border-color: var(--line-on-ink); }
.ledger-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-on-paper);
}
.on-ink .ledger-row { border-color: var(--line-on-ink); }
.ledger-row .tag { font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--accent); }
.on-ink .ledger-row .tag { color: var(--accent-bright); }
.ledger-row h3 { font-size: 17px; margin-bottom: 4px; }
.ledger-row p { font-size: 14.5px; }
@media (max-width: 600px) {
  .ledger-row { grid-template-columns: 1fr; gap: 6px; }
}

/* ---------- Footer ---------- */
footer.site-footer {
  background: var(--ink);
  color: var(--text-paper);
  padding: 72px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-on-ink);
}
@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}
.footer-grid h4 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0 0 16px;
  font-weight: 500;
}
.footer-grid .brand { color: var(--text-paper); margin-bottom: 12px; }
.footer-grid p { color: var(--muted-on-ink); font-size: 14px; max-width: 320px; }
.footer-links { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: var(--muted-on-ink); font-size: 14px; transition: color 0.15s; }
.footer-links a:hover { color: var(--text-paper); }
.footer-bottom {
  padding-top: 28px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted-on-ink);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Contact form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 64px;
}
@media (max-width: 800px) { .contact-grid { grid-template-columns: 1fr; } }

.field { margin-bottom: 22px; }
.field label {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted-on-paper);
  margin-bottom: 8px;
}
.field input, .field select, .field textarea {
  width: 100%;
  font-family: var(--sans);
  font-size: 15px;
  padding: 12px 14px;
  border: 1px solid var(--line-on-paper);
  border-radius: 3px;
  background: var(--paper);
  color: var(--text-ink);
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.field textarea { resize: vertical; min-height: 120px; }
.info-block { margin-bottom: 32px; }
.info-block h4 {
  font-family: var(--mono); font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--brass); margin: 0 0 10px;
}
.info-block p, .info-block a { font-size: 15px; color: var(--text-ink); }
.info-block ul { margin: 0; padding-left: 18px; color: var(--muted-on-paper); font-size: 14.5px; }
.info-block li { margin-bottom: 6px; }

/* focus visibility for a11y across the board */
a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Contact form submission states */
.hp-field { position: absolute !important; left: -9999px !important; opacity: 0 !important; }
.form-status { margin-top: 16px; min-height: 24px; font-size: 14px; }
.form-status.success { color: var(--accent); }
.form-status.error { color: #9b3c34; }
button[disabled] { opacity: .65; cursor: wait !important; }