/* ==========================================================================
   Ortho website — single shared stylesheet
   Plain CSS, no build step. Every page links this file.
   Palette is defined once as custom properties; dark mode swaps the tokens.
   ========================================================================== */

:root {
  --bg:        #fbfaf8;
  --surface:   #ffffff;
  --border:    #e4e1db;
  --text:      #1f2426;
  --text-soft: #5b6266;
  --accent:    #1f6f78;
  --accent-ink:#12454b;
  --accent-bg: #e8f2f2;
  --focus:     #1f6f78;
  --maxw:      64rem;
  --prose:     42rem;
  --radius:    10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #14181a;
    --surface:   #1c2224;
    --border:    #2f3739;
    --text:      #e7e9e9;
    --text-soft: #a2acae;
    --accent:    #5bb5bd;
    --accent-ink:#bfe4e7;
    --accent-bg: #1e3033;
    --focus:     #5bb5bd;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent-ink); }

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

h1, h2, h3 { line-height: 1.25; font-weight: 650; }
h1 { font-size: 2rem; margin: 0 0 .5rem; }
h2 { font-size: 1.4rem; margin: 2.25rem 0 .75rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 .4rem; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }
.prose { max-width: var(--prose); }
.prose p, .prose ul, .prose ol { margin: 0 0 1rem; }

/* ---- Skip link ---------------------------------------------------------- */
.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--surface); color: var(--text);
  padding: .6rem 1rem; border: 1px solid var(--border); border-radius: var(--radius);
}
.skip:focus { left: 1rem; top: 1rem; z-index: 100; }

/* ---- Site header ------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(6px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 60px;
}
.brand {
  font-weight: 700; font-size: 1.05rem; color: var(--text); text-decoration: none;
  letter-spacing: -0.01em;
}
.brand span { color: var(--accent); }
.nav { display: flex; flex-wrap: wrap; gap: .25rem 1.1rem; align-items: center; }
.nav a {
  color: var(--text-soft); text-decoration: none; font-size: .95rem;
  padding: .35rem 0; border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--text); }
.nav a[aria-current="page"] { color: var(--text); border-bottom-color: var(--accent); }

/* ---- Buttons ---------------------------------------------------------- */
.btn {
  display: inline-block; padding: .7rem 1.15rem; border-radius: var(--radius);
  font-size: .98rem; font-weight: 600; text-decoration: none; cursor: pointer;
  border: 1px solid var(--accent); background: var(--accent); color: #fff;
}
.btn:hover { background: var(--accent-ink); border-color: var(--accent-ink); color: #fff; }
.btn.secondary { background: transparent; color: var(--accent); }
.btn.secondary:hover { background: var(--accent-bg); color: var(--accent-ink); }
.btn-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.25rem; }

/* ---- Hero ------------------------------------------------------------- */
.hero { padding: 3.5rem 0 2.5rem; border-bottom: 1px solid var(--border); }
.hero .eyebrow {
  text-transform: uppercase; letter-spacing: .08em; font-size: .8rem;
  font-weight: 700; color: var(--accent); margin: 0 0 .6rem;
}
.hero h1 { font-size: 2.4rem; letter-spacing: -0.02em; }
.hero p.lead { font-size: 1.15rem; color: var(--text-soft); max-width: 40rem; }

/* ---- Sections ------------------------------------------------------- */
section { padding: 2.5rem 0; }
section + section { border-top: 1px solid var(--border); }
.section-title { font-size: 1rem; text-transform: uppercase; letter-spacing: .07em;
  color: var(--text-soft); margin: 0 0 1.25rem; }

/* ---- Card grid ------------------------------------------------------- */
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); }
.card {
  display: block; padding: 1.15rem 1.25rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  text-decoration: none; color: var(--text);
}
.card:hover { border-color: var(--accent); }
.card h3 { margin: 0 0 .25rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--text-soft); font-size: .92rem; }

/* ---- Conditions index --------------------------------------------- */
.region-block { margin-bottom: 2rem; }
.region-block h2 { margin-top: 0; }
.link-list { list-style: none; padding: 0; margin: 0;
  display: grid; gap: .4rem; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); }
.link-list a { display: block; padding: .55rem .75rem; border: 1px solid var(--border);
  border-radius: 8px; background: var(--surface); text-decoration: none; color: var(--text); }
.link-list a:hover { border-color: var(--accent); color: var(--accent-ink); }

/* ---- Procedure page ---------------------------------------------- */
.proc-meta { color: var(--text-soft); font-size: .95rem; margin: 0 0 1.5rem; }
.proc-meta a { color: var(--text-soft); }
.callout {
  background: var(--accent-bg); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--radius); padding: 1rem 1.15rem; margin: 1.5rem 0;
}
.callout p { margin: 0; }
.timeline { list-style: none; padding: 0; margin: 1rem 0; border-left: 2px solid var(--border); }
.timeline li { position: relative; padding: .3rem 0 1rem 1.25rem; }
.timeline li::before {
  content: ""; position: absolute; left: -6px; top: .7rem;
  width: 10px; height: 10px; border-radius: 50%; background: var(--accent);
}
.timeline strong { display: block; }

/* ---- Disclaimer / footer -------------------------------------- */
.disclaimer {
  font-size: .88rem; color: var(--text-soft);
  border-top: 1px solid var(--border); margin-top: 3rem; padding-top: 1.25rem;
}
.site-footer {
  border-top: 1px solid var(--border); background: var(--surface);
  padding: 2rem 0; margin-top: 3rem; font-size: .9rem; color: var(--text-soft);
}
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 1rem 2rem; justify-content: space-between; }
.site-footer a { color: var(--text-soft); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; }

/* ---- Placeholder marker (delete as you fill content) ---------- */
.todo {
  background: repeating-linear-gradient(45deg, #ffe9b0, #ffe9b0 10px, #ffe08a 10px, #ffe08a 20px);
  color: #5a4300; padding: 0 .3em; border-radius: 3px; font-weight: 600;
}
@media (prefers-color-scheme: dark) {
  .todo { background: #5a4300; color: #ffe08a; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero h1 { font-size: 1.9rem; }
  .site-header .wrap { flex-direction: column; align-items: flex-start; gap: .4rem; padding-top: .6rem; padding-bottom: .6rem; }
}