/* ============================================================
   BOREALIS HEALTH — style.css
   Dark-first, clinical & authoritative, medical imaging AI
   ============================================================ */

/* --- DESIGN TOKENS --- */
:root {
  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem + 0.75vw,   1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem + 4vw,      5rem);

  /* Spacing */
  --space-1: 0.25rem; --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;    --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem;    --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem;   --space-20: 5rem;   --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --content-default: 1080px;
  --content-narrow: 720px;
  --radius-sm: 0.375rem; --radius-md: 0.5rem;
  --radius-lg: 0.75rem;  --radius-xl: 1rem;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 180ms var(--ease-out);

  /* Fonts */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;
}

/* --- DARK PALETTE (default) --- */
:root, [data-theme="dark"] {
  --color-bg:         #0d0f14;
  --color-surface:    #121520;
  --color-surface-2:  #171b28;
  --color-border:     #1e2438;
  --color-border-hi:  #2a3152;

  --color-text:       #e2e6f0;
  --color-text-muted: #7a8299;
  --color-text-faint: #3d4460;

  --color-primary:        #4fc4cf;
  --color-primary-hover:  #38b2bd;
  --color-primary-dim:    rgba(79, 196, 207, 0.12);
  --color-primary-glow:   rgba(79, 196, 207, 0.06);

  --color-accent-warm: #c8a96e;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.6);
}

/* --- LIGHT PALETTE --- */
[data-theme="light"] {
  --color-bg:         #f4f6fb;
  --color-surface:    #ffffff;
  --color-surface-2:  #f0f3fa;
  --color-border:     #dde2ef;
  --color-border-hi:  #c8d0e8;

  --color-text:       #0d1124;
  --color-text-muted: #5a6380;
  --color-text-faint: #a0aac0;

  --color-primary:        #0a7a85;
  --color-primary-hover:  #085f69;
  --color-primary-dim:    rgba(10, 122, 133, 0.08);
  --color-primary-glow:   rgba(10, 122, 133, 0.04);

  --color-accent-warm: #8a6b3a;

  --shadow-sm: 0 1px 3px rgba(0,0,20,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,20,0.10);
  --shadow-lg: 0 16px 48px rgba(0,0,20,0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg: #f4f6fb; --color-surface: #ffffff; --color-surface-2: #f0f3fa;
    --color-border: #dde2ef; --color-border-hi: #c8d0e8;
    --color-text: #0d1124; --color-text-muted: #5a6380; --color-text-faint: #a0aac0;
    --color-primary: #0a7a85; --color-primary-hover: #085f69;
    --color-primary-dim: rgba(10,122,133,0.08); --color-primary-glow: rgba(10,122,133,0.04);
    --color-accent-warm: #8a6b3a;
    --shadow-sm: 0 1px 3px rgba(0,0,20,0.08); --shadow-md: 0 4px 16px rgba(0,0,20,0.10);
    --shadow-lg: 0 16px 48px rgba(0,0,20,0.12);
  }
}

/* --- BASE RESET --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth; scroll-padding-top: var(--space-20);
  text-rendering: optimizeLegibility; hanging-punctuation: first last;
}
body {
  min-height: 100dvh; font-family: var(--font-body); font-size: var(--text-base);
  color: var(--color-text); background-color: var(--color-bg); line-height: 1.65;
}
img, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"] { list-style: none; }
h1,h2,h3,h4,h5,h6 { text-wrap: balance; line-height: 1.15; }
p, li { text-wrap: pretty; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--color-primary-dim); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* --- LAYOUT --- */
.container {
  width: 100%; max-width: var(--content-default);
  margin-inline: auto; padding-inline: clamp(var(--space-5), 5vw, var(--space-16));
}
.section { padding-block: clamp(var(--space-16), 8vw, var(--space-32)); }

/* --- TYPOGRAPHY HELPERS --- */
.section-eyebrow {
  font-family: var(--font-body); font-size: var(--text-xs);
  font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-primary); margin-bottom: var(--space-4);
}
.section-header { max-width: 640px; margin-bottom: var(--space-12); }
.section-header h2 {
  font-family: var(--font-display); font-size: var(--text-xl);
  font-weight: 400; color: var(--color-text); margin-top: var(--space-3);
}

/* --- BUTTONS --- */
.btn-primary {
  display: inline-flex; align-items: center; gap: var(--space-2);
  background: var(--color-primary); color: #0d0f14;
  font-family: var(--font-body); font-size: var(--text-sm); font-weight: 600;
  padding: var(--space-3) var(--space-6); border-radius: var(--radius-md);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-primary:hover {
  background: var(--color-primary-hover); transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79, 196, 207, 0.25);
}
[data-theme="light"] .btn-primary { color: #ffffff; }
.btn-ghost {
  display: inline-flex; align-items: center; gap: var(--space-2);
  color: var(--color-text-muted); font-size: var(--text-sm); font-weight: 500;
  padding: var(--space-3) var(--space-6); border: 1px solid var(--color-border-hi);
  border-radius: var(--radius-md); transition: color var(--transition), border-color var(--transition);
}
.btn-ghost:hover { color: var(--color-text); border-color: var(--color-text-muted); }

/* --- HEADER --- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 80%, transparent);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.header--scrolled { box-shadow: var(--shadow-md); }
.header-inner {
  display: flex; align-items: center; gap: var(--space-8);
  max-width: var(--content-default); margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-16));
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: var(--space-3); flex-shrink: 0;
  color: var(--color-text); transition: opacity var(--transition);
}
.logo:hover { opacity: 0.8; }
.logo-text { font-size: var(--text-sm); font-weight: 600; letter-spacing: -0.01em; }
.nav { display: flex; align-items: center; gap: var(--space-6); margin-left: auto; }
.nav a {
  font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 450;
  transition: color var(--transition);
}
.nav a:hover { color: var(--color-text); }
.nav a.nav-active { color: var(--color-text); }
.nav-cta {
  background: var(--color-primary-dim) !important; color: var(--color-primary) !important;
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-md);
  font-weight: 600 !important; border: 1px solid color-mix(in srgb, var(--color-primary) 20%, transparent);
  transition: background var(--transition), color var(--transition) !important;
}
.nav-cta:hover { background: var(--color-primary) !important; color: #0d0f14 !important; }
[data-theme="light"] .nav-cta:hover { color: #ffffff !important; }
.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: var(--radius-md);
  color: var(--color-text-muted); border: 1px solid var(--color-border);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-border-hi); background: var(--color-surface); }

/* --- HERO --- */
.hero {
  position: relative; overflow: hidden; min-height: 90vh;
  display: flex; align-items: center;
  padding-block: clamp(var(--space-20), 10vw, var(--space-32));
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none; overflow: hidden;
}
.aurora {
  position: absolute; border-radius: 50%; filter: blur(80px);
  animation: drift 12s ease-in-out infinite alternate;
}
.aurora-1 {
  width: 60vw; height: 60vw; max-width: 800px; max-height: 800px;
  top: -20%; left: -10%; opacity: 0.07;
  background: radial-gradient(circle, #4fc4cf 0%, transparent 70%);
  animation-delay: 0s;
}
.aurora-2 {
  width: 40vw; height: 40vw; max-width: 600px; max-height: 600px;
  top: 10%; right: -5%; opacity: 0.05;
  background: radial-gradient(circle, #6b8cff 0%, transparent 70%);
  animation-delay: -4s;
}
.aurora-3 {
  width: 30vw; height: 30vw; max-width: 400px; max-height: 400px;
  bottom: -10%; left: 30%; opacity: 0.04;
  background: radial-gradient(circle, #4fc4cf 0%, transparent 70%);
  animation-delay: -8s;
}
@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(3%, 5%) scale(1.08); }
}
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 64px 64px; opacity: 0.25;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 100%);
}
[data-theme="light"] .grid-overlay { opacity: 0.4; }
[data-theme="light"] .aurora-1 { opacity: 0.12; }
[data-theme="light"] .aurora-2 { opacity: 0.08; }
[data-theme="light"] .aurora-3 { opacity: 0.07; }

.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-eyebrow {
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--color-primary);
  margin-bottom: var(--space-5);
}
h1 {
  font-family: var(--font-display); font-size: var(--text-3xl);
  font-weight: 400; line-height: 1.08; color: var(--color-text);
  margin-bottom: var(--space-6);
}
h1 em {
  font-style: italic; color: var(--color-primary);
}
.hero-sub {
  font-size: var(--text-base); color: var(--color-text-muted);
  max-width: 580px; line-height: 1.7; margin-bottom: var(--space-8);
}
.hero-actions { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-16); }

/* Stats bar */
.hero-stats {
  display: flex; align-items: center; gap: 0;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-5) var(--space-8);
  width: fit-content; flex-wrap: wrap; gap: var(--space-6);
}
.stat { display: flex; flex-direction: column; gap: var(--space-1); }
.stat-number {
  font-family: var(--font-display); font-size: var(--text-xl);
  font-weight: 400; color: var(--color-text); line-height: 1;
}
.stat-unit { font-size: 0.6em; color: var(--color-text-muted); }
.stat-label { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 500; }
.stat-divider { width: 1px; height: 40px; background: var(--color-border); flex-shrink: 0; }

/* --- SERVICES --- */
.services { background: var(--color-surface); }
.services-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); }
.service-card {
  padding: var(--space-8); border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.service-card:hover { border-color: var(--color-border-hi); box-shadow: var(--shadow-md); }
.service-card--accent {
  border-color: color-mix(in srgb, var(--color-primary) 25%, transparent);
  background: color-mix(in srgb, var(--color-primary) 4%, var(--color-bg));
}
.service-card--accent:hover {
  border-color: color-mix(in srgb, var(--color-primary) 45%, transparent);
}
.service-icon {
  width: 52px; height: 52px; border-radius: var(--radius-lg);
  background: var(--color-primary-dim);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary); margin-bottom: var(--space-5);
}
.service-card h3 {
  font-family: var(--font-display); font-size: var(--text-lg);
  font-weight: 400; color: var(--color-text); margin-bottom: var(--space-3);
}
.service-card p {
  font-size: var(--text-sm); color: var(--color-text-muted);
  line-height: 1.7; margin-bottom: var(--space-5);
}
.service-list { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-6); }
.service-list li {
  font-size: var(--text-sm); color: var(--color-text-muted);
  padding-left: var(--space-4); position: relative;
}
.service-list li::before {
  content: ''; position: absolute; left: 0; top: 0.55em;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-primary); opacity: 0.7;
}
.service-market {
  font-size: var(--text-xs); color: var(--color-text-faint);
  font-weight: 500; letter-spacing: 0.04em;
  padding-top: var(--space-4); border-top: 1px solid var(--color-border);
}

/* --- SECTION RULE --- */
.section-rule {
  height: 1px; background: var(--color-border);
  margin-inline: clamp(var(--space-5), 5vw, var(--space-16));
}

/* --- ABOUT --- */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(var(--space-12), 6vw, var(--space-24));
  margin-bottom: var(--space-16);
}
.about-left .section-eyebrow { margin-bottom: var(--space-3); }
.about-left h2 {
  font-family: var(--font-display); font-size: var(--text-xl);
  font-weight: 400; color: var(--color-text);
  margin-bottom: var(--space-6); margin-top: var(--space-3);
}
.about-left p {
  font-size: var(--text-sm); color: var(--color-text-muted);
  line-height: 1.75; margin-bottom: var(--space-4);
}
.about-left .btn-primary { margin-top: var(--space-4); }

/* Timeline */
.career-timeline { display: flex; flex-direction: column; gap: 0; }
.timeline-item {
  padding: var(--space-5) 0 var(--space-5) var(--space-6);
  border-left: 1px solid var(--color-border);
  position: relative;
  transition: border-color var(--transition);
}
.timeline-item::before {
  content: ''; position: absolute; left: -4px; top: var(--space-5);
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--color-primary); opacity: 0.5;
  transition: opacity var(--transition);
}
.timeline-item:first-child::before { opacity: 1; }
.timeline-item:first-child { border-left-color: var(--color-primary); }
.timeline-period {
  font-size: var(--text-xs); color: var(--color-primary);
  font-weight: 600; letter-spacing: 0.06em; margin-bottom: var(--space-1);
}
.timeline-role {
  font-size: var(--text-sm); color: var(--color-text);
  font-weight: 600; margin-bottom: var(--space-1);
}
.timeline-org {
  font-size: var(--text-sm); color: var(--color-accent-warm);
  font-weight: 500; margin-bottom: var(--space-2);
}
.timeline-desc {
  font-size: var(--text-xs); color: var(--color-text-muted); line-height: 1.65;
}

/* Credentials bar */
.credentials-bar {
  display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-6);
  padding: var(--space-6) var(--space-8);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}
.credential { display: flex; flex-direction: column; gap: 2px; }
.cred-label { font-size: var(--text-xs); font-weight: 600; color: var(--color-text); }
.cred-org { font-size: var(--text-xs); color: var(--color-text-muted); }
.cred-divider { width: 1px; height: 32px; background: var(--color-border); flex-shrink: 0; }

/* --- CONTACT --- */
.contact {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}
.contact-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-16);
}
.contact-content { max-width: 520px; }
.contact-content h2 {
  font-family: var(--font-display); font-size: var(--text-xl);
  font-weight: 400; color: var(--color-text);
  margin-top: var(--space-3); margin-bottom: var(--space-5);
}
.contact-content p {
  font-size: var(--text-sm); color: var(--color-text-muted);
  line-height: 1.75; margin-bottom: var(--space-8);
}
.contact-email {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-base); font-weight: 600;
  color: var(--color-primary); margin-bottom: var(--space-4);
  transition: gap var(--transition), opacity var(--transition);
}
.contact-email:hover { gap: var(--space-4); opacity: 0.8; }
.contact-location {
  display: flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); color: var(--color-text-muted);
}
.contact-mark { color: var(--color-primary); flex-shrink: 0; opacity: 0.6; }

/* --- FOOTER --- */
.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
  background: var(--color-bg);
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: var(--space-4);
}
.footer-brand {
  display: flex; align-items: center; gap: var(--space-3);
  color: var(--color-text-muted); font-size: var(--text-sm); font-weight: 500;
}
.footer-copy { font-size: var(--text-xs); color: var(--color-text-faint); }

/* --- RESPONSIVE --- */
@media (max-width: 900px) {
  .services-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-inner { flex-direction: column; }
  .contact-mark { display: none; }
  .hero-stats { gap: var(--space-4); }
  .stat-divider { display: none; }
}
@media (max-width: 640px) {
  h1 { line-height: 1.1; }
  .nav a:not(.nav-cta) { display: none; }
  .credentials-bar { gap: var(--space-4); }
  .cred-divider { display: none; }
  .hero-stats { padding: var(--space-4) var(--space-5); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* --- SCROLL REVEAL (JS driven) --- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out); }
.reveal.visible { opacity: 1; transform: none; }