/* PassmoreLab — technical / instrument aesthetic
   Dark slate default, monospace accents, restrained scientific type.
*/

:root {
  /* Fonts */
  --font-body: 'Inter', 'Helvetica Neue', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-display: 'Newsreader', 'Times New Roman', Georgia, serif;

  /* Type scale — restrained, no theatrical hero */
  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.8125rem, 0.78rem + 0.2vw, 0.9375rem);
  --text-base: clamp(0.9375rem, 0.9rem + 0.25vw, 1.0625rem);
  --text-lg: clamp(1.0625rem, 1rem + 0.4vw, 1.25rem);
  --text-xl: clamp(1.35rem, 1.2rem + 0.9vw, 1.75rem);
  --text-2xl: clamp(1.85rem, 1.5rem + 1.6vw, 2.75rem);
  --text-hero: clamp(2.2rem, 1.6rem + 2.6vw, 3.6rem);

  /* 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;

  /* Radii */
  --radius-sm: 2px;
  --radius-md: 3px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --content-wide: 1180px;
}

/* Dark (default) — instrument-panel slate */
[data-theme='dark'] {
  --bg: #0d1116;
  --surface: #12171e;
  --surface-2: #171d26;
  --surface-alt: #0f141a;
  --border: #212a35;
  --border-strong: #2c3846;
  --grid: rgba(255, 255, 255, 0.035);

  --text: #d6dde5;
  --text-muted: #8892a0;
  --text-faint: #5b6472;

  --accent: #7ac6b8;      /* muted phosphor teal — CRT / spectrum green-cyan */
  --accent-dim: #3a7d75;
  --accent-warm: #d7a86a; /* amber trace, used very sparingly */
}

/* Light — printed engineering paper */
[data-theme='light'] {
  --bg: #f4f2ec;
  --surface: #ffffff;
  --surface-2: #faf8f2;
  --surface-alt: #eeeae2;
  --border: #cfc9bd;
  --border-strong: #a8a196;
  --grid: rgba(0, 0, 0, 0.05);

  --text: #1a1e24;
  --text-muted: #55606d;
  --text-faint: #8a8578;

  --accent: #1f6b62;
  --accent-dim: #64988f;
  --accent-warm: #96521a;
}

/* Base reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  /* subtle graph-paper grid */
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}
ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-interactive);
}
a:hover {
  color: var(--accent);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.01em;
  text-wrap: balance;
  line-height: 1.15;
  color: var(--text);
}

p {
  text-wrap: pretty;
  max-width: 68ch;
  color: var(--text);
}

em {
  font-style: italic;
  color: var(--accent);
}

::selection {
  background: color-mix(in oklab, var(--accent) 45%, transparent);
  color: var(--text);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.container {
  width: min(100% - var(--space-8), var(--content-wide));
  margin-inline: auto;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  letter-spacing: 0.02em;
}

/* ─────────────── HEADER ─────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  gap: var(--space-6);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text);
}
.brand:hover {
  color: var(--text);
}

.brand-mark {
  color: var(--accent);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 2px;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}
.site-header nav a {
  color: var(--text-muted);
  padding-block: var(--space-2);
  border-bottom: 1px solid transparent;
}
.site-header nav a:hover {
  color: var(--text);
  border-bottom-color: var(--accent-dim);
}

.theme-toggle {
  width: 32px;
  height: 32px;
  display: inline-grid;
  place-items: center;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--border-strong);
}

@media (max-width: 640px) {
  .brand-sub {
    display: none;
  }
  .site-header nav {
    gap: var(--space-4);
  }
}

/* ─────────────── HERO ─────────────── */
.hero {
  padding-block: clamp(var(--space-12), 10vw, var(--space-24));
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.hero::before {
  /* faint concentric range-rings */
  content: '';
  position: absolute;
  right: -160px;
  top: -160px;
  width: 640px;
  height: 640px;
  border-radius: 50%;
  border: 1px dashed color-mix(in oklab, var(--accent) 22%, transparent);
  box-shadow:
    0 0 0 60px color-mix(in oklab, var(--accent) 4%, transparent),
    inset 60px 60px 0 -30px color-mix(in oklab, var(--accent) 3%, transparent);
  pointer-events: none;
  opacity: 0.7;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px color-mix(in oklab, var(--accent) 60%, transparent);
  animation: blink 2.4s ease-in-out infinite;
}
@keyframes blink {
  50% {
    opacity: 0.35;
  }
}

.hero h1 {
  font-size: var(--text-hero);
  max-width: 22ch;
  font-weight: 400;
  margin-bottom: var(--space-6);
}

.lede {
  font-size: var(--text-lg);
  color: var(--text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-10);
}

.waterfall {
  border: 1px solid var(--border);
  background: var(--surface-alt);
  padding: var(--space-3);
  margin-bottom: var(--space-8);
  position: relative;
}
.waterfall::before {
  content: 'CH.A · 24-HR SPECTRAL BASELINE';
  position: absolute;
  top: 6px;
  left: 10px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--text-faint);
}
.waterfall svg {
  width: 100%;
  height: 120px;
  display: block;
}

/* Stat strip */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--border);
  background: var(--surface);
}
.stat-strip > div {
  padding: var(--space-4) var(--space-5);
  border-right: 1px solid var(--border);
}
.stat-strip > div:last-child {
  border-right: none;
}
.stat-strip dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}
.stat-strip dd {
  font-size: var(--text-sm);
  color: var(--text);
}

.live-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 6px;
  box-shadow: 0 0 8px var(--accent);
  animation: blink 2s ease-in-out infinite;
}

@media (max-width: 800px) {
  .stat-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-strip > div {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .stat-strip > div:nth-child(odd) {
    border-right: 1px solid var(--border);
  }
  .stat-strip > div:nth-last-child(-n + 2) {
    border-bottom: none;
  }
}

/* ─────────────── SECTIONS ─────────────── */
.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  border-bottom: 1px solid var(--border);
}
.section-alt {
  background: var(--surface-alt);
}

.section-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.section-head {
  margin-bottom: var(--space-12);
  max-width: 62ch;
}
.section-head h2 {
  font-size: var(--text-2xl);
  margin-top: var(--space-3);
}
.section-sub {
  margin-top: var(--space-4);
  color: var(--text-muted);
}

.two-col {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-12);
  align-items: start;
}
.two-col .col-label {
  position: sticky;
  top: 100px;
}
.two-col h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}
.two-col p {
  margin-bottom: var(--space-4);
  color: var(--text-muted);
}
.two-col p.prose-lead {
  color: var(--text);
  font-size: var(--text-lg);
}
@media (max-width: 720px) {
  .two-col {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .two-col .col-label {
    position: static;
  }
}

/* Research grid */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0;
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}

.research-card {
  padding: var(--space-6);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: relative;
  transition: background var(--transition-interactive);
}
.research-card:hover {
  background: var(--surface-2);
}

.card-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  margin-bottom: var(--space-4);
}
.research-card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}
.research-card p {
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: 1.65;
}

/* Project list */
.project-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}
.project-list li {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-8);
  padding-block: var(--space-6);
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.proj-body {
  min-width: 0;
}
.proj-body p {
  max-width: 72ch;
}
.proj-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-family: var(--font-mono);
}
.proj-id {
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.08em;
}
.proj-tag {
  font-size: 0.68rem;
  color: var(--text-faint);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.project-list h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}
.project-list p {
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: 1.65;
}
@media (max-width: 720px) {
  .project-list li {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  .proj-meta {
    flex-direction: row;
    align-items: center;
    gap: var(--space-4);
  }
}

/* Hero notice callout */
.hero-notice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-10);
  background: color-mix(in oklab, var(--accent) 8%, var(--surface));
  border: 1px solid color-mix(in oklab, var(--accent) 35%, var(--border));
  border-left: 3px solid var(--accent);
  max-width: 62ch;
}
.hero-notice-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 3px;
  flex-shrink: 0;
}
.hero-notice p {
  color: var(--text);
  font-size: var(--text-sm);
  margin: 0;
}

/* Contact */
.contact-body h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}
.contact-line {
  margin-block: var(--space-6);
  font-size: var(--text-lg);
}
.mono-link {
  font-family: var(--font-mono);
  color: var(--accent);
  border-bottom: 1px solid var(--accent-dim);
  padding-bottom: 2px;
}
.mono-link:hover {
  color: var(--text);
  border-bottom-color: var(--accent);
}
.contact-note {
  font-size: var(--text-sm);
  color: var(--text-faint);
  max-width: 60ch;
}

/* ─────────────── FOOTER ─────────────── */
.site-footer {
  padding-block: var(--space-8);
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
}
.footer-meta {
  font-size: 0.75rem;
  color: var(--text-faint);
}
@media (max-width: 600px) {
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

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