/* Altitude Sickness Denver — plain CSS, no build step, no web fonts.
   Component classes follow wiki/components/component-library.md.
   Palette overridden to Intravene brand (#00b8d1). */

:root{
  --brand:#00b8d1; --brand-dark:#007585; --brand-pale:#e6f8fb;
  --navy:#123a45; --navy-dark:#0c2830;
  --alert:#C0392B; --alert-pale:#fdf0ee;
  --ink:#1a1a2e; --ink-soft:#4a5a6a;
  --line:#e3e8ee; --bg:#fff; --bg-alt:#f5f7fa;
  --max:1160px; --radius:6px;
  --font-head:Georgia,'Times New Roman',serif;
  --font-body:system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font-body);color:var(--ink);background:var(--bg);line-height:1.7;font-size:17px}
img{max-width:100%;height:auto;display:block}
a{color:#007585}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;z-index:200;background:#fff;padding:10px 14px;border-radius:var(--radius)}

h1,h2,h3,h4{font-family:var(--font-head);line-height:1.25;color:var(--navy);margin:0 0 .5em}
h1{font-size:clamp(1.8rem,1.2rem + 2.6vw,2.7rem)}
h2{font-size:clamp(1.4rem,1.1rem + 1.4vw,1.95rem);margin-top:1.8em}
h3{font-size:clamp(1.12rem,1rem + .6vw,1.35rem);margin-top:1.4em}
p,ul,ol,table{margin:0 0 1.1em}
ul,ol{padding-left:1.3em}
li{margin-bottom:.4em}
strong{color:var(--navy)}

/* ---------- header ---------- */
.site-header{border-bottom:1px solid var(--line)}
.header-top{background:var(--navy);color:#fff}
.header-top__inner{max-width:var(--max);margin:0 auto;padding:10px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.nav__logo{color:#fff;text-decoration:none;font-family:var(--font-head);font-size:1.15rem;font-weight:700;letter-spacing:.01em}
.nav__logo span{color:var(--brand)}
.header-contact{display:flex;gap:20px;flex-wrap:wrap;font-size:.85rem}
.header-contact__item{color:#cfe9ef;text-decoration:none}
.header-contact__item:hover{color:#fff}

.site-nav{background:var(--brand)}
.site-nav .wrap{display:flex;align-items:center;justify-content:space-between}
.nav__toggle{display:none;background:none;border:0;color:#fff;font-size:1.4rem;padding:12px 4px;cursor:pointer;line-height:1}
.nav__links{display:flex;list-style:none;margin:0;padding:0;flex-wrap:wrap;align-items:center}
.nav__links li{margin:0}
.nav__links a{display:block;color:var(--navy-dark);text-decoration:none;padding:13px 14px;font-size:.93rem;font-weight:700}
.nav__links a:hover{background:rgba(255,255,255,.32)}
.nav__call{background:var(--navy);color:#fff!important;border-radius:var(--radius);margin-left:8px}
.nav__call:hover{background:var(--navy-dark)!important}

/* ---------- hero ---------- */
.hero{background:linear-gradient(160deg,var(--brand-pale) 0%,#fff 78%);padding:44px 0 38px;border-bottom:1px solid var(--line)}
.hero__split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
.hero__inner{max-width:70ch}
.hero__eyebrow{display:inline-block;background:var(--navy);color:#fff;font-family:var(--font-body);font-size:.72rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;padding:5px 11px;border-radius:3px;margin:0 0 14px}
.hero__sub{font-family:var(--font-head);font-size:1.05rem;color:var(--ink-soft);margin:0 0 6px}
.hero h1{margin-bottom:.45em}
.hero__checklist{list-style:none;padding:0;margin:0 0 22px}
.hero__checklist li{position:relative;padding-left:28px;margin-bottom:9px}
.hero__checklist li::before{content:"✓";position:absolute;left:0;top:0;color:var(--brand-dark);font-weight:700}
.hero__cta{display:flex;gap:11px;flex-wrap:wrap}
.hero__photo img{border-radius:var(--radius)}

/* ---------- sections ---------- */
.section{padding:34px 0}
.section--alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section__lead{max-width:68ch}
.section__lead>*:last-child{margin-bottom:0}

/* ---------- buttons ---------- */
.btn{display:inline-block;text-decoration:none;font-weight:700;font-size:.94rem;padding:11px 20px;border-radius:var(--radius);border:2px solid transparent;transition:background .15s}
.btn--brand{background:var(--brand);color:var(--navy-dark)}
.btn--brand:hover{background:#3fcbdd}
.btn--navy{background:var(--navy);color:#fff}
.btn--navy:hover{background:var(--navy-dark)}
.btn--ghost{background:transparent;color:#fff;border-color:#fff}
.btn--ghost:hover{background:rgba(255,255,255,.14)}
.btn--outline{background:#fff;color:var(--navy);border-color:var(--navy)}
.btn--outline:hover{background:var(--bg-alt)}
.btn--lg{font-size:1.02rem;padding:14px 26px}

/* ---------- cards / grids / lists ---------- */
.grid{display:grid;gap:18px}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--line);border-top:3px solid var(--brand);border-radius:var(--radius);padding:18px 20px}
.card h3{margin-top:0}
.card p:last-child{margin-bottom:0}
.linklist{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.linklist li{margin:0}
.linklist a{display:block;border:1px solid var(--line);border-radius:var(--radius);padding:13px 15px;text-decoration:none;color:var(--navy);font-weight:600;background:#fff}
.linklist a:hover{border-color:var(--brand);background:var(--brand-pale)}

/* ---------- tables ---------- */
.table-scroll{overflow-x:auto;margin:0 0 1.1em}
table{border-collapse:collapse;width:100%;font-size:.94rem}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--navy);color:#fff;font-family:var(--font-body);font-size:.86rem;letter-spacing:.02em}
tbody tr:nth-child(even){background:var(--bg-alt)}

/* ---------- alert box (NEW — add back to component library) ---------- */
.alert-box{background:var(--alert-pale);border-left:4px solid var(--alert);border-radius:0 var(--radius) var(--radius) 0;padding:18px 22px;margin:26px 0}
.alert-box h2,.alert-box h3{color:var(--alert);margin-top:0}
.alert-box ul{margin-bottom:.6em}
.alert-box>*:last-child{margin-bottom:0}

/* ---------- FAQ ---------- */
.faq details{border:1px solid var(--line);border-radius:var(--radius);margin-bottom:10px;background:#fff}
.faq summary{cursor:pointer;padding:14px 46px 14px 17px;font-weight:700;color:var(--navy);font-family:var(--font-head);font-size:1.04rem;position:relative;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:18px;top:12px;font-size:1.4rem;color:var(--brand-dark);font-family:var(--font-body)}
.faq details[open] summary::after{content:"–"}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq .faq__a{padding:14px 17px}
.faq .faq__a>*:last-child{margin-bottom:0}

/* ---------- phone strip ---------- */
.phone-strip{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:30px 0;margin:34px 0 0}
.phone-strip h2{margin-top:0}
.phone-strip .sub{color:var(--ink-soft);max-width:60ch}
.phone-strip .btns{display:flex;gap:11px;flex-wrap:wrap;margin-top:16px}

/* ---------- form ---------- */
.form-card{background:var(--brand-pale);border:1px solid #bfe9f1;border-radius:var(--radius);padding:22px 24px}
.form-card h3{margin-top:0}
.field{margin-bottom:14px}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:5px;color:var(--navy)}
.field input,.field textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:var(--radius);font:inherit;font-size:.95rem;background:#fff}
.field textarea{min-height:100px;resize:vertical}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* ---------- byline / meta ---------- */
.byline{border-top:1px solid var(--line);margin-top:34px;padding-top:18px;font-size:.9rem;color:var(--ink-soft)}
.byline p{margin-bottom:.5em}
.breadcrumb{font-size:.85rem;color:var(--ink-soft);padding:12px 0 0}
.breadcrumb a{color:var(--ink-soft)}

/* ---------- footer ---------- */
.site-footer{background:var(--navy);color:#c9dde3;margin-top:46px;padding:38px 0 0;font-size:.92rem}
.site-footer a{color:#c9dde3;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.site-footer .footer-grid h2{color:#fff;font-size:.98rem;margin:0 0 12px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:28px;padding-bottom:26px}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin-bottom:7px}
.footer-brand{font-family:var(--font-head);font-size:1.1rem;color:#fff;margin-bottom:10px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);padding:16px 0;font-size:.84rem;color:#9dbcc5}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .nav__toggle{display:block}
  .nav__links{display:none;width:100%;flex-direction:column;align-items:stretch;padding-bottom:8px}
  .nav__links.open{display:flex}
  .site-nav .wrap{flex-wrap:wrap}
  .nav__call{margin:6px 0 0}
  .hero__split{grid-template-columns:1fr}
  .hero__photo{order:-1}
  .grid--3,.linklist{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  body{font-size:16px}
  .grid--2,.grid--3,.linklist,.form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero__cta,.phone-strip .btns{flex-direction:column;align-items:stretch}
  .btn{text-align:center}
  .header-contact{gap:12px;font-size:.8rem}
}
@media print{
  .site-nav,.phone-strip,.site-footer,.nav__toggle{display:none}
  .faq details{border:0}
  .faq .faq__a{display:block!important}
}

/* ---------- imagery ---------- */
.image-band{padding:8px 0 22px}
.image-band img{width:100%;max-height:340px;object-fit:cover;border-radius:var(--radius)}
.hero__photo img{border-radius:var(--radius);box-shadow:0 2px 18px rgba(18,58,69,.13)}
.portrait{margin:0 0 24px;max-width:290px;float:right;padding:0 0 14px 22px}
.portrait img{border-radius:var(--radius);background:var(--brand-pale)}
.portrait figcaption{font-size:.84rem;color:var(--ink-soft);padding-top:8px;line-height:1.5}
@media (max-width:700px){.portrait{float:none;max-width:100%;padding:0 0 14px}}

/* footer column headings are h2 for heading-order validity, styled small */
.site-footer .footer-grid h2{color:#fff;font-size:.98rem;margin:0 0 12px;font-family:var(--font-head);line-height:1.25}

/* ---------- transparent phone CTA (what you're calling for, then the number) ---------- */
.btn--phone{display:inline-flex;flex-direction:column;align-items:flex-start;gap:1px;
  padding:9px 20px;line-height:1.2;text-align:left}
.btn--phone .btn__what{font-size:.68rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.03em;opacity:.82}
.btn--phone .btn__number{font-size:1.04rem;font-weight:800}
@media (max-width:600px){
  .btn--phone .btn__what{font-size:.64rem}
}

/* phone-strip CTA row: align the button and the secondary link on one baseline */
.phone-strip .btns{align-items:center}
.phone-strip .btns a:not(.btn){color:var(--brand-dark);font-weight:600;text-decoration:underline}