/* ==========================================================================
   Saugata Chatterjee Sitar — style.css
   Design system: Visual Brand Specification (canonical colors/type below)
   ========================================================================== */

:root {
  /* Brand colors — canonical values, do not sample from imagery */
  --midnight-indigo: #111827;
  --soft-charcoal: #1C1C1C;
  --warm-ivory: #F4EFE6;
  --antique-gold: #C49A52;
  --deep-burgundy: #6B2737;

  /* Derived */
  --ivory-muted: rgba(244, 239, 230, 0.72);
  --gold-muted: rgba(196, 154, 82, 0.55);
  --overlay-scrim: rgba(17, 24, 39, 0.55);

  /* Type */
  --font-display: "Cormorant Garamond", serif;
  --font-body: "Inter", sans-serif;

  /* Layout */
  --content-max: 1240px;
  --gutter: clamp(1.25rem, 4vw, 3rem);

  /* Motion / focus */
  --focus-ring: 2px solid var(--antique-gold);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--midnight-indigo);
  color: var(--warm-ivory);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0;
  color: var(--warm-ivory);
}
p { margin: 0; }

a:focus-visible,
button:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}

.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn-primary {
  background: var(--antique-gold);
  color: var(--midnight-indigo);
  border-color: var(--antique-gold);
}
.btn-primary:hover { background: #b78b46; border-color: #b78b46; }
.btn-ghost {
  background: transparent;
  color: var(--warm-ivory);
  border-color: var(--gold-muted);
}
.btn-ghost:hover { border-color: var(--antique-gold); color: var(--antique-gold); }
.btn-outline {
  background: transparent;
  color: var(--antique-gold);
  border-color: var(--antique-gold);
}
.btn-outline:hover { background: var(--antique-gold); color: var(--midnight-indigo); }

/* ---------- Header / Nav ---------- */
.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
}
.navbar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.5rem var(--gutter);
}
.nav-panel {
  display: contents;
}
.nav-toggle-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.nav-toggle-label {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 26px;
  height: 20px;
  cursor: pointer;
  flex-shrink: 0;
}
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--warm-ivory);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle-input:focus-visible ~ .nav-toggle-label {
  outline: var(--focus-ring);
  outline-offset: 4px;
}
.brand-mark {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--warm-ivory);
}
.brand-initials { line-height: 1; }
.brand-fullname {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  line-height: 1.1;
}
.brand-name {
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--warm-ivory);
}
.brand-role {
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--antique-gold);
}
@media (max-width: 480px) {
  .brand-fullname { display: none; }
}
.nav-links {
  display: flex;
  gap: 2rem;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
}
.nav-links a { padding-block: 0.25rem; border-bottom: 1px solid transparent; }
.nav-links a:hover { border-color: var(--antique-gold); color: var(--antique-gold); }
.nav-cta {
  display: none;
  flex-shrink: 0;
  white-space: nowrap;
  padding: 0.55rem 1.15rem;
  font-size: 0.72rem;
}

@media (min-width: 720px) {
  .nav-cta { display: inline-flex; }
}
@media (max-width: 719px) {
  .nav-toggle-label { display: flex; }
  .nav-panel {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 1.75rem var(--gutter) 2.25rem;
    background: var(--soft-charcoal);
    border-bottom: 1px solid rgba(196, 154, 82, 0.15);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height 0.25s ease, opacity 0.2s ease;
  }
  .nav-links {
    flex-direction: column;
    gap: 1.25rem;
  }
  .nav-cta { display: inline-flex; }
  #nav-toggle:checked ~ .nav-panel {
    max-height: 22rem;
    opacity: 1;
    pointer-events: auto;
  }
  #nav-toggle:checked ~ .nav-toggle-label .nav-toggle-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  #nav-toggle:checked ~ .nav-toggle-label .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }
  #nav-toggle:checked ~ .nav-toggle-label .nav-toggle-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--midnight-indigo);
}
.hero-media {
  position: absolute;
  inset: 0;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center right;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    rgba(17, 24, 39, 0.92) 0%,
    rgba(17, 24, 39, 0.65) 38%,
    rgba(17, 24, 39, 0.15) 70%
  );
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
  padding: var(--gutter);
  padding-bottom: clamp(3rem, 8vw, 6rem);
  text-shadow: 0 2px 16px rgba(17, 24, 39, 0.55);
}

@media (max-width: 680px) {
  .hero-overlay {
    background: linear-gradient(
      180deg,
      rgba(17, 24, 39, 0.35) 0%,
      rgba(17, 24, 39, 0.55) 45%,
      rgba(17, 24, 39, 0.92) 78%
    );
  }
  .hero { align-items: flex-end; }
  .hero-content { max-width: 100%; }
}
.eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--antique-gold);
  margin-bottom: 1rem;
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.75rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--warm-ivory);
}
.hero-subtitle {
  margin-top: 0.6rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.35rem, 2.6vw, 2.15rem);
  color: var(--antique-gold);
}
.hero-copy {
  margin-top: 1.5rem;
  max-width: 42ch;
  font-size: 1.05rem;
  color: var(--ivory-muted);
}
.hero-actions {
  margin-top: 2.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ---------- Section heading ---------- */
.section-heading { margin-bottom: 2.5rem; }
.section-heading h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}
.section-subtitle {
  margin-top: 0.5rem;
  color: var(--ivory-muted);
  font-size: 0.95rem;
}

/* ---------- Recordings ---------- */
.recordings {
  background: var(--midnight-indigo);
  padding-block: clamp(4rem, 8vw, 7rem);
}
.recordings-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 780px) {
  .recordings-grid { grid-template-columns: repeat(3, 1fr); }
}
.recording-card {
  background: var(--soft-charcoal);
  border: 1px solid rgba(196, 154, 82, 0.15);
}
.recording-link { display: block; }
.recording-link img {
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}
.recording-info { padding: 1.25rem 1.4rem 1.5rem; }
.recording-info h3 {
  font-size: 1.4rem;
  margin-bottom: 0.4rem;
}
.recording-meta {
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--ivory-muted);
}
.recording-card:hover .recording-info h3 { color: var(--antique-gold); }
.recordings-more { margin-top: 3rem; text-align: center; }

/* ---------- Lineage ---------- */
.lineage {
  background: var(--soft-charcoal);
  padding-block: clamp(4rem, 8vw, 7rem);
}
.lineage-inner { max-width: 760px; text-align: center; }
.lineage-path {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  gap: 0.75rem 0.5rem;
  margin: 2rem 0 2.5rem;
}
.lineage-path li {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ivory-muted);
}
.lineage-path li:last-child .lineage-name { color: var(--antique-gold); }
.lineage-path li:not(:last-child)::after {
  content: "";
  display: inline-block;
  width: 2.5rem;
  height: 1px;
  background: var(--gold-muted);
  margin-left: 0.75rem;
  vertical-align: middle;
}
.lineage-copy {
  color: var(--ivory-muted);
  font-size: 1rem;
}
.lineage-link {
  display: inline-block;
  margin-top: 1.75rem;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--antique-gold);
  border-bottom: 1px solid var(--gold-muted);
  padding-bottom: 0.15rem;
}
.lineage-link:hover { border-color: var(--antique-gold); }

/* ---------- About ---------- */
.about {
  background: var(--midnight-indigo);
  padding-block: clamp(4rem, 8vw, 7rem);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}
@media (min-width: 780px) {
  .about-grid { grid-template-columns: 0.85fr 1.15fr; gap: 4rem; }
}
.about-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 35% 30%;
}
.about-copy h2 { margin-bottom: 1.25rem; }
.about-copy p {
  color: var(--ivory-muted);
  font-size: 1rem;
  max-width: 58ch;
}

/* ---------- Final CTA ---------- */
.final-cta {
  background: var(--deep-burgundy);
  padding-block: clamp(4rem, 8vw, 6rem);
}
.final-cta-inner { text-align: center; max-width: 640px; }
.final-cta h2 {
  font-size: clamp(1.9rem, 3.5vw, 2.75rem);
  margin-bottom: 2rem;
}
.final-cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}
.final-cta-links {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ivory-muted);
}
.final-cta-links a:hover { color: var(--warm-ivory); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--soft-charcoal);
  padding-block: 2.5rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}
.footer-copy {
  font-size: 0.8rem;
  color: var(--ivory-muted);
}
.footer-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.footer-links a:hover { color: var(--antique-gold); }

/* ---------- Utility ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Lineage page ---------- */
.lineage-page {
  background: var(--midnight-indigo);
  padding-block: clamp(7rem, 14vw, 10rem) clamp(4rem, 8vw, 7rem);
}
.lineage-page-inner {
  max-width: 760px;
}
.lineage-page-wide {
  max-width: 1040px;
}
.lineage-page-header {
  text-align: center;
  margin-bottom: clamp(3rem, 6vw, 4.5rem);
}
.lineage-page-header h1 {
  font-size: clamp(2.25rem, 4vw, 3rem);
  margin-top: 0.75rem;
}
.lineage-page-section {
  margin-bottom: clamp(3rem, 6vw, 4.5rem);
}
.lineage-page-section h2 {
  font-size: clamp(1.5rem, 2.5vw, 1.9rem);
  margin-bottom: 1.25rem;
}
.lineage-page-section p {
  color: var(--ivory-muted);
  font-size: 1rem;
  margin-bottom: 1.1rem;
}
.lineage-page-section p:last-child { margin-bottom: 0; }
.lineage-page-intro p:first-child {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--warm-ivory);
}
.lineage-page-closing {
  border-top: 1px solid rgba(196, 154, 82, 0.15);
  padding-top: clamp(2.5rem, 5vw, 3.5rem);
}
.lineage-page-closing p:first-child {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--warm-ivory);
}

.chain-vertical {
  display: flex;
  flex-direction: column;
  align-items: center;
  list-style: none;
  margin: 2rem 0;
  padding: 0;
}
.chain-vertical li {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--ivory-muted);
  text-align: center;
}
.chain-vertical li:last-child { color: var(--antique-gold); }
.chain-vertical li:not(:last-child)::after {
  content: "";
  display: block;
  width: 1px;
  height: 1.75rem;
  background: var(--gold-muted);
  margin: 0.6rem auto;
}
.chain-vertical--compact {
  margin: 0;
}
.chain-vertical--compact li {
  font-size: 0.92rem;
  line-height: 1.3;
}
.chain-vertical--compact li:not(:last-child)::after {
  height: 1.25rem;
  margin: 0.45rem auto;
}

.archival-placeholder {
  margin-top: 1.5rem;
  border: 1px dashed var(--gold-muted);
  padding: 1.5rem;
  text-align: center;
}
.archival-placeholder span {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ivory-muted);
}

/* Lineage tree diagrams (single tree + multi-stream) */
.tree {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 2.5rem auto 0;
  max-width: 520px;
}
.tree-node {
  font-family: var(--font-display);
  font-size: 0.95rem;
  text-align: center;
  line-height: 1.3;
  padding: 0.3rem 0.5rem;
  color: var(--warm-ivory);
}
.tree-node--accent,
.tree-node--current {
  color: var(--antique-gold);
}
.tree-node--muted {
  color: var(--ivory-muted);
}

/* Three Musical Lineages (streams) diagram */
.streams-diagram {
  margin-top: 2.5rem;
}
.streams {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: end;
  gap: 2.5rem;
}
.stream {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.stream-label {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--antique-gold);
  text-align: center;
  margin-bottom: 1.5rem;
}
.streams-convergence-bar {
  position: relative;
  width: 100%;
  height: 2rem;
  margin-top: 1.5rem;
}
.streams-convergence-bar .bar {
  position: absolute;
  bottom: 0;
  left: calc(100% / 6);
  right: calc(100% / 6);
  height: 1px;
  background: var(--gold-muted);
}
.streams-convergence-bar .stem {
  position: absolute;
  top: 0;
  width: 1px;
  height: 100%;
  background: var(--gold-muted);
}
.streams-convergence-bar .stem--col1 { left: calc(100% / 6); }
.streams-convergence-bar .stem--col2 { left: 50%; }
.streams-convergence-bar .stem--col3 { left: calc(100% * 5 / 6); }
.streams-diagram > .tree-line { margin: 0 auto; }
.streams-diagram > .tree-node { margin: 0 auto; }

@media (max-width: 860px) {
  .streams {
    grid-template-columns: 1fr;
    align-items: stretch;
    gap: 3rem;
  }
  .streams-convergence-bar { display: none; }
  .streams-diagram > .tree-line { margin-top: 3rem; }
}
.tree-line {
  width: 1px;
  height: 1.5rem;
  background: var(--gold-muted);
}
.tree-row {
  display: flex;
  width: 100%;
  gap: 1.5rem;
}
.tree-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}
.tree-connector {
  position: relative;
  width: 100%;
  height: 1.5rem;
}
.tree-connector .bar {
  position: absolute;
  top: 50%;
  left: 25%;
  right: 25%;
  height: 1px;
  background: var(--gold-muted);
}
.tree-connector .stem {
  position: absolute;
  width: 1px;
  background: var(--gold-muted);
}
.tree-connector.split .stem--center { left: 50%; top: 0; height: 50%; }
.tree-connector.split .stem--left { left: 25%; top: 50%; height: 50%; }
.tree-connector.split .stem--right { left: 75%; top: 50%; height: 50%; }
.tree-connector.merge .stem--center { left: 50%; top: 50%; height: 50%; }
.tree-connector.merge .stem--left { left: 25%; top: 0; height: 50%; }
.tree-connector.merge .stem--right { left: 75%; top: 0; height: 50%; }