/* ============ AMARA RUSLAN — CARDIOTHORACIC ============ */
:root {
  --bg: #060304;
  --bg-2: #0c0507;
  --ivory: #ece3d8;
  --ivory-dim: #b3a698;
  --crimson: #a4132e;
  --crimson-hot: #e0233f;
  --hairline: rgba(236, 227, 216, 0.13);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ivory);
  font-family: "Hanken Grotesk", sans-serif;
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--crimson); color: var(--ivory); }

.mono {
  font-family: "Spline Sans Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 400;
}

em { font-style: italic; }

/* ---- grain ---- */
.grain {
  position: fixed; inset: -50%;
  width: 200%; height: 200%;
  pointer-events: none;
  z-index: 60;
  opacity: 0.055;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain-shift 0.9s steps(4) infinite;
}
@keyframes grain-shift {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-2%, 1%); }
  50% { transform: translate(1%, -2%); }
  75% { transform: translate(-1%, 2%); }
  100% { transform: translate(2%, -1%); }
}

/* ---- cursor ---- */
.cursor {
  position: fixed; top: 0; left: 0;
  width: 10px; height: 10px;
  border-radius: 50%;
  border: 1px solid var(--crimson-hot);
  pointer-events: none;
  z-index: 90;
  transform: translate(-50%, -50%);
  transition: width 0.25s var(--ease-out), height 0.25s var(--ease-out),
    background 0.25s, opacity 0.3s;
  opacity: 0;
}
.cursor.on { opacity: 1; }
.cursor.hover {
  width: 44px; height: 44px;
  background: rgba(224, 35, 63, 0.08);
}
@media (hover: none) { .cursor { display: none; } }

/* ---- nav ---- */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.4rem 3rem;
  z-index: 50;
  background: linear-gradient(rgba(6, 3, 4, 0.82), rgba(6, 3, 4, 0.55) 70%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.nav::after {
  content: "";
  position: absolute; left: 3rem; right: 3rem; bottom: 0;
  height: 1px; background: var(--hairline);
}
.nav-mark {
  font-family: "Fraunces", serif;
  font-size: 1.3rem;
  color: var(--ivory);
  text-decoration: none;
  letter-spacing: 0.06em;
}
.nav-mark span { color: var(--crimson-hot); }
.nav-links { display: flex; gap: 2.2rem; }
.nav-links a {
  color: var(--ivory-dim);
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.3s;
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute; left: 0; bottom: -4px;
  width: 100%; height: 1px;
  background: var(--crimson-hot);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s var(--ease-out);
}
.nav-links a:hover { color: var(--ivory); }
.nav-links a:hover::after { transform: scaleX(1); transform-origin: left; }
.nav-bpm { color: var(--crimson-hot); display: flex; align-items: center; gap: 0.5rem; }
.bpm-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--crimson-hot);
  animation: bpm-pulse 1.03s ease-out infinite;
}
@keyframes bpm-pulse {
  0% { box-shadow: 0 0 0 0 rgba(224, 35, 63, 0.7); }
  70% { box-shadow: 0 0 0 9px rgba(224, 35, 63, 0); }
  100% { box-shadow: 0 0 0 0 rgba(224, 35, 63, 0); }
}

/* ---- hero ---- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
}
#heart-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
}
.hero-glow {
  position: absolute;
  top: 18%; right: 8%;
  width: 55vmin; height: 55vmin;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(164, 19, 46, 0.16), transparent 65%);
  filter: blur(10px);
  animation: glow-breathe 4.2s ease-in-out infinite;
}
@keyframes glow-breathe {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.08); opacity: 1; }
}
.hero-vignette {
  position: absolute; inset: 0;
  background:
    radial-gradient(120% 90% at 18% 55%, rgba(6, 3, 4, 0.62) 0%, transparent 55%),
    linear-gradient(rgba(6, 3, 4, 0.5), transparent 22%, transparent 78%, rgba(6, 3, 4, 0.75));
  pointer-events: none;
}
@media (max-width: 900px) {
  .hero-glow { top: 6%; right: auto; left: 50%; transform: translateX(-50%); }
  .hero-vignette {
    background: linear-gradient(rgba(6, 3, 4, 0.55), transparent 30%,
      rgba(6, 3, 4, 0.35) 60%, rgba(6, 3, 4, 0.8));
  }
}
.hero-inner {
  position: relative;
  z-index: 2;
  padding: 0 3rem;
  max-width: 1200px;
  pointer-events: none;
}
.kicker {
  color: var(--crimson-hot);
  margin-bottom: 1.6rem;
}
.hero-title {
  font-family: "Fraunces", serif;
  font-weight: 300;
  font-optical-sizing: auto;
  font-size: clamp(2.8rem, 8.2vw, 7.6rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
}
.hero-title .line { display: block; }
.hero-title em { color: var(--crimson-hot); font-weight: 400; }
.hero-sub {
  margin-top: 2rem;
  max-width: 34rem;
  color: var(--ivory-dim);
  font-size: 1.02rem;
}
.hero-foot {
  position: absolute;
  left: 3rem; right: 3rem; bottom: 2rem;
  display: flex; justify-content: space-between; align-items: flex-end;
  z-index: 2;
  color: var(--ivory-dim);
}
.hero-count, .hero-coord { color: var(--ivory-dim); }
.scroll-cue {
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
  color: var(--ivory-dim);
}
.cue-line {
  width: 1px; height: 44px;
  background: linear-gradient(var(--crimson-hot), transparent);
  animation: cue 2.2s var(--ease-out) infinite;
}
@keyframes cue {
  0% { transform: scaleY(0); transform-origin: top; }
  45% { transform: scaleY(1); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---- ecg ---- */
.ecg-wrap {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: 0.4rem 0;
  background: var(--bg-2);
}
.ecg { display: block; width: 100%; height: 64px; }
.ecg-path {
  fill: none;
  stroke: var(--crimson-hot);
  stroke-width: 1.6;
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
  filter: drop-shadow(0 0 6px rgba(224, 35, 63, 0.8));
  animation: ecg-run 5s linear infinite;
}
@keyframes ecg-run {
  0% { stroke-dashoffset: 1400; }
  60% { stroke-dashoffset: 0; opacity: 1; }
  92% { opacity: 1; }
  100% { stroke-dashoffset: 0; opacity: 0; }
}

/* ---- marquee ---- */
.marquee {
  overflow: hidden;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg-2);
}
.marquee-track {
  display: flex;
  white-space: nowrap;
  animation: marquee 38s linear infinite;
  font-family: "Fraunces", serif;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--ivory-dim);
}
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---- sections ---- */
section { padding: 9rem 3rem; max-width: 1300px; margin: 0 auto; }
.sec-head {
  display: flex; align-items: baseline; gap: 1.6rem;
  margin-bottom: 4.5rem;
}
.sec-no { color: var(--crimson-hot); }
.sec-title {
  font-family: "Fraunces", serif;
  font-weight: 300;
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  letter-spacing: -0.01em;
}

/* ---- practice ---- */
.practice-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 5rem;
}
.practice-lede {
  font-family: "Fraunces", serif;
  font-size: clamp(1.3rem, 2.2vw, 1.75rem);
  line-height: 1.5;
  font-weight: 300;
}
.practice-lede em { color: var(--crimson-hot); }
.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
.stat { background: var(--bg); padding: 2rem 1.6rem; }
.stat-num {
  font-size: clamp(2rem, 3.6vw, 3rem);
  color: var(--crimson-hot);
  letter-spacing: 0;
  text-transform: none;
}
.stat-label { color: var(--ivory-dim); font-size: 0.86rem; margin-top: 0.5rem; }

/* ---- procedures ---- */
.proc-list { list-style: none; border-top: 1px solid var(--hairline); }
.proc {
  display: grid;
  grid-template-columns: 6rem 1fr 1.2fr;
  gap: 2.5rem;
  align-items: baseline;
  padding: 2.4rem 0.5rem;
  border-bottom: 1px solid var(--hairline);
  position: relative;
  transition: background 0.45s var(--ease-out), padding-left 0.45s var(--ease-out);
}
.proc::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--crimson-hot);
  transform: scaleY(0);
  transition: transform 0.45s var(--ease-out);
}
.proc:hover { background: rgba(224, 35, 63, 0.045); padding-left: 1.4rem; }
.proc:hover::before { transform: scaleY(1); }
.proc-idx { color: var(--crimson-hot); }
.proc-name {
  font-family: "Fraunces", serif;
  font-weight: 400;
  font-size: clamp(1.25rem, 2.4vw, 1.8rem);
  line-height: 1.2;
}
.proc-desc { color: var(--ivory-dim); font-size: 0.95rem; }

/* ---- principles ---- */
.prin-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
.prin { background: var(--bg); padding: 3rem 2.2rem 3.4rem; position: relative; overflow: hidden; }
.prin::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--crimson-hot);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s var(--ease-out);
}
.prin:hover::after { transform: scaleX(1); }
.prin-no {
  color: var(--crimson-hot);
  font-size: 1rem;
  display: block;
  margin-bottom: 1.4rem;
}
.prin h3 {
  font-family: "Fraunces", serif;
  font-weight: 400;
  font-size: 1.5rem;
  margin-bottom: 1rem;
  line-height: 1.25;
}
.prin p { color: var(--ivory-dim); font-size: 0.95rem; }

/* ---- contact ---- */
.contact { text-align: center; padding-bottom: 7rem; }
.contact-title {
  font-family: "Fraunces", serif;
  font-weight: 300;
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 1.05;
  margin: 1.4rem 0 2.6rem;
}
.contact-title em { color: var(--crimson-hot); }
.contact-link {
  font-family: "Spline Sans Mono", monospace;
  font-size: clamp(1rem, 2.4vw, 1.5rem);
  color: var(--ivory);
  text-decoration: none;
  border-bottom: 1px solid var(--crimson-hot);
  padding-bottom: 0.3rem;
  transition: color 0.3s, border-color 0.3s;
}
.contact-link:hover { color: var(--crimson-hot); }
.contact-meta { color: var(--ivory-dim); margin-top: 2.4rem; }

/* ---- footer ---- */
.footer {
  border-top: 1px solid var(--hairline);
  padding: 2.2rem 3rem 2.8rem;
  color: var(--ivory-dim);
}
.footer-row {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  margin-bottom: 1rem;
}
.footer-row a { color: var(--crimson-hot); text-decoration: none; }
.footer-row a:hover { text-decoration: underline; }
.footer-note { font-size: 0.8rem; max-width: 46rem; opacity: 0.7; }
.footer-note a { color: var(--crimson-hot); text-decoration: none; border-bottom: 1px solid rgba(224,35,63,0.35); }
.footer-note a:hover { border-bottom-color: var(--crimson-hot); }

/* ---- reveals ---- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.18s; }
.reveal.d3 { transition-delay: 0.28s; }
.reveal.d4 { transition-delay: 0.42s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .marquee-track, .ecg-path, .grain, .cue-line { animation: none; }
}

/* ---- responsive ---- */
@media (max-width: 900px) {
  .nav { padding: 1.1rem 1.4rem; }
  .nav::after { left: 1.4rem; right: 1.4rem; }
  .nav-links { display: none; }
  section { padding: 5.5rem 1.4rem; }
  .hero-inner { padding: 0 1.4rem; }
  .hero-foot { left: 1.4rem; right: 1.4rem; }
  .hero-coord { display: none; }
  .practice-grid { grid-template-columns: 1fr; gap: 3rem; }
  .proc { grid-template-columns: 1fr; gap: 0.7rem; padding: 1.8rem 0.5rem; }
  .prin-grid { grid-template-columns: 1fr; }
  .footer { padding: 2rem 1.4rem; }
}