/* Peak Research — design tokens and component classes.
   Plain CSS on plain HTML: no JavaScript, no build step. */
@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@400;600;800&display=swap');

:root {
  /* Dark medical-tech theme — teal/slate branding */
  --color-bg: #0E2024;        /* deep teal-black ground */
  --color-surface: #163037;   /* raised teal surface */
  --color-text: #F4F7F6;      /* crisp cool off-white ink */
  --color-divider: color-mix(in srgb, #F4F7F6 20%, transparent);

  --color-accent: #3A8795;    /* medium teal — marks, stats, banner */
  --color-accent-100: #E4EEF0;
  --color-accent-400: #57A6B4;
  --color-accent-500: #3A8795;
  --color-accent-600: #2C6773;
  --color-accent-700: #8FC6D0; /* light teal — small accent text on dark */
  --color-accent-800: #163A42;
  --color-accent-900: #112A30;

  --color-neutral-100: #f8f4f4;
  --color-neutral-800: #444141;

  --font-heading: "Archivo", system-ui, sans-serif;
  --font-heading-weight: 800;
  --font-body: "Archivo", system-ui, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
}

html { scroll-behavior: smooth; }

* , *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  font-weight: 400;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0 0 var(--space-2);
}
h1 { font-size: 42px; }
h2 { font-size: 32px; }
h3 { font-size: 25px; }

p { margin: 0 0 var(--space-3); }
a { color: var(--color-accent); text-underline-offset: 3px; }
img { display: block; max-width: 100%; }
figure { margin: 0; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-accent) 30%, transparent); }

.pr-mono { font-feature-settings: "tnum" 1; }
.grayscale { filter: grayscale(1) contrast(1.08); }

/* — rules — */
.hr {
  height: 2px; border: 0; margin: var(--space-4) 0;
  background: var(--color-divider);
}

/* — buttons — */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  cursor: pointer; text-decoration: none;
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 14px; line-height: 1.2; color: var(--color-text);
  background: transparent; border: 1px solid transparent;
  padding: var(--space-2) calc(var(--space-3) * 1.2);
  border-radius: 0;
}
.btn-primary { background: #1E4E59; color: #FFFFFF; }  /* deep slate primary */
.btn-primary:hover { background: #3A8795; }            /* accent-teal on hover */
.btn-primary:active { background: #2C6773; }
.btn-ghost { color: var(--color-accent); padding-inline: var(--space-1); }
.btn-ghost:hover { background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.btn-ghost:active { background: color-mix(in srgb, var(--color-accent) 18%, transparent); }

/* — tags — */
.tag {
  display: inline-flex; align-items: center; font-size: 11px;
  letter-spacing: 0.02em; padding: 3px 10px; border-radius: 0;
}
.tag-accent { background: var(--color-accent-100); color: var(--color-accent-800); }
.tag-neutral { background: var(--color-neutral-100); color: var(--color-neutral-800); }

/* — navigation — */
.nav {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
}
.nav-brand {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 18px;
}
.nav a { color: inherit; text-decoration: none; font-size: 14px; }
.nav a:hover { color: var(--color-accent); }
@media (max-width: 760px) { .pr-nav-links { display: none !important; } }

/* — tables — */
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th {
  text-align: left; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 60%, transparent);
  padding: var(--space-2); border-bottom: 2px solid var(--color-divider);
}
.table td {
  padding: var(--space-2);
  border-bottom: 1px solid var(--color-divider);
}
.table tbody tr:hover { background: color-mix(in srgb, var(--color-text) 4%, transparent); }

/* — placeholder photo — */
.placeholder-photo {
  display: flex; align-items: center; justify-content: center; text-align: center;
  background: var(--color-surface);
  border: 2px dashed var(--color-accent-600);
  color: var(--color-accent-700);
  font-size: 14px; line-height: 1.5; padding: 24px;
}