/* ======================================================
   VitalSoftAI — Design Tokens
   Concept: the vital-sign waveform as structural signature.
   Health research produces signal — this site reads like one.
   ====================================================== */

:root {
  /* Color */
  --paper: #eef2ee;
  --paper-alt: #e3eae4;
  --panel: #fbfcfa;
  --ink: #12211d;
  --ink-soft: #4c5d56;
  --ink-faint: #83938b;
  --teal: #0b4f4a;
  --teal-deep: #072f2c;
  --teal-bright: #12746c;
  --coral: #e15b3f;
  --coral-deep: #c4462d;
  --gold: #c98a2e;
  --line: #c7d1c9;
  --line-dark: #2b4842;

  /* Type */
  --f-display: "Fraunces", serif;
  --f-body: "IBM Plex Sans", sans-serif;
  --f-mono: "IBM Plex Mono", monospace;

  /* Layout */
  --maxw: 1180px;
  --pad: clamp(20px, 5vw, 64px);
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}
a {
  color: inherit;
}

h1,
h2,
h3,
h4 {
  font-family: var(--f-display);
  color: var(--ink);
  margin: 0 0 0.4em;
  font-weight: 600;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 1em;
  color: var(--ink-soft);
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.eyebrow {
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--coral-deep);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 1px;
  background: var(--coral-deep);
  display: inline-block;
}

/* focus visibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--teal-bright);
  outline-offset: 3px;
}

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

/* ---------------- Nav ---------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(238, 242, 238, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 19px;
  text-decoration: none;
  color: var(--ink);
}
.brand .pulse-mark {
  width: 26px;
  height: 16px;
}
.brand .pulse-mark path {
  fill: none;
  stroke: var(--coral);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  text-decoration: none;
  font-size: 14.5px;
  color: var(--ink-soft);
  font-weight: 500;
  transition: color 0.15s ease;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--teal);
}
.nav-links a.active {
  color: var(--ink);
  font-weight: 600;
}
.nav-cta {
  background: var(--ink);
  color: var(--panel) !important;
  padding: 9px 18px;
  border-radius: 3px;
  font-size: 14px !important;
  font-weight: 600 !important;
}
.nav-cta:hover {
  background: var(--teal);
  color: var(--panel) !important;
}
.nav-toggle {
  display: none;
}

@media (max-width: 820px) {
  .nav-links {
    position: fixed;
    inset: 64px 0 auto 0;
    background: var(--panel);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition:
      opacity 0.18s ease,
      transform 0.18s ease;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links li {
    width: 100%;
    border-top: 1px solid var(--line);
  }
  .nav-links a {
    display: block;
    padding: 16px var(--pad);
  }
  .nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    width: 32px;
    height: 24px;
    position: relative;
  }
  .nav-toggle span {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--ink);
    transition:
      transform 0.2s ease,
      opacity 0.2s ease;
  }
  .nav-toggle span:nth-child(1) {
    top: 2px;
  }
  .nav-toggle span:nth-child(2) {
    top: 11px;
  }
  .nav-toggle span:nth-child(3) {
    top: 20px;
  }
  .nav-toggle.open span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }
  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.open span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }
}

/* ---------------- Waveform divider (signature element) ---------------- */
.trace {
  width: 100%;
  height: 64px;
  display: block;
  overflow: visible;
}
.trace path {
  fill: none;
  stroke: var(--line-dark);
  stroke-width: 1.4;
  opacity: 0.55;
}
.trace.on-dark path {
  stroke: rgba(255, 255, 255, 0.28);
}
.trace .draw {
  stroke: var(--coral);
  stroke-width: 2;
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: draw 2.6s ease forwards 0.2s;
}
@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-body);
  font-weight: 600;
  font-size: 14.5px;
  padding: 13px 24px;
  border-radius: 3px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-primary {
  background: var(--teal);
  color: #fff;
}
.btn-primary:hover {
  background: var(--teal-deep);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-dark);
}
.btn-ghost:hover {
  border-color: var(--ink);
}
.btn-on-dark.btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}
.btn-on-dark.btn-ghost:hover {
  border-color: #fff;
}

/* ---------------- Sections generic ---------------- */
section {
  padding: 88px 0;
}
.section-tight {
  padding: 56px 0;
}
.dark {
  background: var(--teal-deep);
  color: #fff;
}
.dark p {
  color: rgba(255, 255, 255, 0.72);
}
.dark h1,
.dark h2,
.dark h3 {
  color: #fff;
}
.dark .eyebrow {
  color: var(--gold);
}
.dark .eyebrow::before {
  background: var(--gold);
}

.panel-bg {
  background: var(--panel);
}
.alt-bg {
  background: var(--paper-alt);
}

/* ---------------- Reveal on scroll ---------------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------------- Footer ---------------- */
footer {
  background: var(--teal-deep);
  color: rgba(255, 255, 255, 0.75);
  padding: 56px 0 28px;
}
footer .foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}
footer h4 {
  color: #fff;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
  font-weight: 600;
}
footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
footer li {
  margin-bottom: 9px;
}
footer a {
  text-decoration: none;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}
footer a:hover {
  color: #fff;
}
footer .brand {
  color: #fff;
}
footer .foot-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12.5px;
  font-family: var(--f-mono);
  color: rgba(255, 255, 255, 0.5);
}
@media (max-width: 760px) {
  footer .foot-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------------- Responsive overrides for inline grids ---------------- */
@media (max-width: 900px) {
  section .wrap > div[style*="grid-template-columns:1fr 1fr"],
  section .wrap > div[style*="grid-template-columns:1.15fr 1fr"],
  section .wrap > div[style*="grid-template-columns:1fr 1.15fr"],
  section .wrap > div[style*="grid-template-columns:1.3fr 1fr"],
  section .wrap > div[style*="grid-template-columns:repeat(4,1fr)"],
  section .wrap > div[style*="grid-template-columns:repeat(3,1fr)"],
  section .wrap > div[style*="grid-template-columns:repeat(2,1fr)"] {
    grid-template-columns: 1fr !important;
  }
  section .wrap > div[style*="order:2"] {
    order: 1 !important;
  }
  section .wrap > div[style*="order:1"] {
    order: 2 !important;
  }
}
@media (max-width: 620px) {
  h1 {
    font-size: clamp(30px, 9vw, 40px) !important;
  }
}