/* ===========================================================================
   Delta Summit — Marketing site stylesheet
   Faithful re-creation of the Claude design ("Delta Summit Site.dc.html").
   Standard HTML/CSS/JS — no proprietary runtime.

   NOTE ON THE ACCENT: the original design tokens name the accent "Summit Gold"
   (#c9a227), but the prototype's runtime overrides every --ds-gold-* / --accent
   variable with the `accentColor` prop, whose default is BLUE #3a6bcb. That blue
   is what the live preview actually renders, so it is baked in below to match
   the design exactly. To switch to gold, set --ds-gold-500/-400 and the --accent*
   group back to the gold values noted inline.
   =========================================================================== */

/* ---------- Riviera Nights — brand typeface (self-hosted) ---------- */
/* text optical size (WebS) */
@font-face{font-family:"Riviera Nights";font-style:normal;font-weight:200;font-display:swap;src:url("assets/fonts/RivieraNights-Ultralight-WebS.woff2") format("woff2");}
@font-face{font-family:"Riviera Nights";font-style:normal;font-weight:300;font-display:swap;src:url("assets/fonts/RivieraNights-Light-WebS.woff2") format("woff2"),url("assets/fonts/RivieraNights-Light-WebS.woff") format("woff");}
@font-face{font-family:"Riviera Nights";font-style:normal;font-weight:400;font-display:swap;src:url("assets/fonts/RivieraNights-Regular-WebS.woff2") format("woff2"),url("assets/fonts/RivieraNights-Regular-WebS.woff") format("woff");}
@font-face{font-family:"Riviera Nights";font-style:normal;font-weight:500;font-display:swap;src:url("assets/fonts/RivieraNights-Medium-WebS.woff2") format("woff2"),url("assets/fonts/RivieraNights-Medium-WebS.woff") format("woff");}
@font-face{font-family:"Riviera Nights";font-style:normal;font-weight:700;font-display:swap;src:url("assets/fonts/RivieraNights-Bold-WebS.woff2") format("woff2"),url("assets/fonts/RivieraNights-Bold-WebS.woff") format("woff");}
/* display optical size (WebXL) */
@font-face{font-family:"Riviera Nights Display";font-style:normal;font-weight:200;font-display:swap;src:url("assets/fonts/RivieraNights-Ultralight-WebXL.woff2") format("woff2");}
@font-face{font-family:"Riviera Nights Display";font-style:normal;font-weight:300;font-display:swap;src:url("assets/fonts/RivieraNights-Light-WebXL.woff2") format("woff2");}
@font-face{font-family:"Riviera Nights Display";font-style:normal;font-weight:400;font-display:swap;src:url("assets/fonts/RivieraNights-Regular-WebXL.woff2") format("woff2");}
@font-face{font-family:"Riviera Nights Display";font-style:normal;font-weight:500;font-display:swap;src:url("assets/fonts/RivieraNights-Medium-WebXL.woff2") format("woff2");}
@font-face{font-family:"Riviera Nights Display";font-style:normal;font-weight:700;font-display:swap;src:url("assets/fonts/RivieraNights-Bold-WebXL.woff2") format("woff2");}

/* ===========================  COLOR TOKENS  =============================== */
:root{
  --ds-black:#020407; --ds-white:#ffffff;
  --ds-neutral-950:#020407; --ds-neutral-900:#0a0d12; --ds-neutral-850:#11151b;
  --ds-neutral-800:#181d25; --ds-neutral-700:#252b35; --ds-neutral-600:#3a414d;
  --ds-neutral-500:#5c6470; --ds-neutral-400:#858d99; --ds-neutral-300:#b4bbc4;
  --ds-neutral-200:#d7dbe0; --ds-neutral-150:#e6e9ec; --ds-neutral-100:#f1f3f5;
  --ds-neutral-50:#f8f9fa;

  /* Accent — BLUE (#3a6bcb) as the live design renders it.
     Gold reference values (unused): gold-500 #c9a227 · gold-400 #d9b94e */
  --ds-gold-700:#2a4f97;
  --ds-gold-500:#3a6bcb;   /* primary accent (was Summit Gold #c9a227) */
  --ds-gold-400:#8da9e1;   /* lightened accent rgb(141,169,225) */
  --ds-gold-300:#b6c9ec;
  --ds-gold-100:#e2eaf7;

  --ds-success:#2f9e6b; --ds-warning:#d9952b; --ds-danger:#d24b46; --ds-info:#4a82c4;

  --surface-base:var(--ds-black); --surface-raised:var(--ds-neutral-900);
  --surface-card:var(--ds-neutral-850); --surface-overlay:var(--ds-neutral-800);
  --surface-inset:#06090d;

  --text-primary:var(--ds-white); --text-secondary:var(--ds-neutral-300);
  --text-tertiary:var(--ds-neutral-400); --text-disabled:var(--ds-neutral-600);
  --text-inverse:var(--ds-black); --text-accent:var(--ds-gold-400);

  --border-subtle:rgba(255,255,255,0.08); --border-default:rgba(255,255,255,0.14);
  --border-strong:rgba(255,255,255,0.28); --border-accent:var(--ds-gold-500);

  /* hover darkens (was #8da9e1): white button text must hold >=4.5:1 while hovered (WCAG AA) */
  --accent:#3a6bcb; --accent-hover:#2a4f97; --accent-ink:#ffffff;
  --ds-accent-rgb:58,107,203; --focus-ring:#8da9e1;

  /* ---- Typography ---- */
  --font-display:"Riviera Nights Display","Riviera Nights",system-ui,sans-serif;
  --font-text:"Riviera Nights",system-ui,-apple-system,Segoe UI,sans-serif;
  --font-mono:ui-monospace,Menlo,Consolas,monospace;

  /* ---- Radius / motion ---- */
  --radius-none:0; --radius-xs:2px; --radius-sm:4px; --radius-md:8px;
  --radius-lg:12px; --radius-xl:18px; --radius-pill:999px;
  --ease-standard:cubic-bezier(0.4,0,0.2,1); --ease-out:cubic-bezier(0.16,1,0.3,1);
  --dur-fast:140ms; --dur-base:220ms; --dur-slow:420ms;
}

/* Light scope — used by the capability-statement document card */
[data-theme="light"]{
  --surface-base:var(--ds-white); --surface-raised:var(--ds-neutral-50);
  --surface-card:var(--ds-white); --surface-overlay:var(--ds-white);
  --surface-inset:var(--ds-neutral-100);
  --text-primary:var(--ds-black); --text-secondary:var(--ds-neutral-600);
  --text-tertiary:var(--ds-neutral-500); --text-disabled:var(--ds-neutral-300);
  --text-inverse:var(--ds-white); --text-accent:var(--ds-gold-700);
  --border-subtle:rgba(2,4,7,0.07); --border-default:rgba(2,4,7,0.13);
  --border-strong:rgba(2,4,7,0.26); --accent-ink:var(--ds-black);
}

/* ===========================  BASE / RESET  ============================== */
*{box-sizing:border-box;}
html,body{margin:0;padding:0;background:#020407;}
body{-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;}
::selection{background:rgba(58,107,203,.32);color:#fff;}
input::placeholder,textarea::placeholder{color:var(--ds-neutral-400);}
img{max-width:100%;}
main{display:block;}

/* ---- Accessibility: skip link + visible keyboard focus (WCAG 2.4.1 / 2.4.7) ---- */
.skip-link{position:fixed;top:14px;left:14px;z-index:200;transform:translateY(-250%);
  background:#020407;color:#fff;border:1px solid var(--focus-ring);border-radius:var(--radius-sm);
  padding:10px 18px;font-family:var(--font-text);font-size:13px;letter-spacing:0.06em;
  text-transform:uppercase;text-decoration:none;
  transition:transform var(--dur-fast) var(--ease-standard);}
.skip-link:focus{transform:translateY(0);}
main:focus{outline:none;} /* programmatic skip-link target, not interactive */
:focus-visible{outline:2px solid var(--focus-ring);outline-offset:3px;}
.field-input:focus-visible{outline:none;} /* focus shown on the field underline instead */

.ds-root{background:#020407;color:var(--ds-white);font-family:var(--font-text);min-height:100vh;overflow-x:hidden;}

/* ===========================  BUTTON  =================================== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;width:auto;
  border:1px solid transparent;border-radius:var(--radius-sm);font-family:var(--font-text);
  font-weight:500;text-transform:uppercase;cursor:pointer;white-space:nowrap;text-decoration:none;
  transition:background var(--dur-fast) var(--ease-standard),border-color var(--dur-fast) var(--ease-standard),color var(--dur-fast) var(--ease-standard),transform var(--dur-fast) var(--ease-standard);}
.btn:active{transform:translateY(1px);}
.btn-sm{padding:0 16px;height:36px;font-size:13px;letter-spacing:0.04em;}
.btn-md{padding:0 22px;height:44px;font-size:14px;letter-spacing:0.06em;}
.btn-lg{padding:0 30px;height:54px;font-size:15px;letter-spacing:0.08em;}
.btn-primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);}
.btn-primary:hover{background:var(--accent-hover);}
.btn-ghost{background:transparent;color:var(--text-primary);border-color:var(--border-strong);}
.btn-ghost:hover{background:rgba(255,255,255,0.06);border-color:var(--text-primary);}
.btn-secondary{background:var(--text-primary);color:var(--text-inverse);border-color:var(--text-primary);}
.btn-secondary:hover{opacity:0.88;}

/* =====================  INTERACTIVE LINK/NAV STATES  ==================== */
/* Header wordmark */
.wordmark{display:flex;align-items:baseline;gap:0.34em;background:transparent;border:none;cursor:pointer;
  font-family:var(--font-display);line-height:1;color:#fff;padding:0;text-decoration:none;}
.wordmark .w-delta{font-weight:700;font-size:19px;letter-spacing:0.14em;text-transform:uppercase;}
.wordmark .w-summit{font-weight:700;font-size:19px;letter-spacing:0.3em;text-transform:uppercase;}

/* Header / nav links */
.nav-link{background:transparent;border:none;border-bottom:1.5px solid transparent;padding:4px 0;
  font-family:var(--font-text);font-size:13.5px;letter-spacing:0.04em;color:var(--ds-neutral-400);
  cursor:pointer;transition:color .3s ease,border-color .3s ease;text-decoration:none;}
.nav-link:hover{color:var(--ds-white);}
.nav-link.is-active{color:var(--ds-white);border-bottom-color:var(--ds-gold-500);}

/* Small uppercase "deltasummit.co" / "Delta Summit ↗" link */
.smalllink{background:transparent;border:none;cursor:pointer;font-family:var(--font-text);font-size:11px;
  letter-spacing:0.16em;text-transform:uppercase;color:var(--ds-neutral-400);transition:color .3s ease;
  text-decoration:none;padding:0;}
.smalllink:hover{color:var(--ds-neutral-300);}

/* Splash door buttons */
.door{display:flex;flex-direction:column;align-items:center;gap:14px;background:#020407;border:none;
  padding:clamp(40px,5vw,72px) clamp(16px,3vw,32px);cursor:pointer;color:#fff;transition:background .45s ease;
  text-decoration:none;}
.door:hover{background:rgba(255,255,255,.045);}
.door .door-title{font-family:var(--font-display);font-weight:200;font-size:clamp(26px,3.6vw,46px);letter-spacing:0.01em;line-height:1;}
.door .door-sub{font-family:var(--font-text);font-size:clamp(12px,1.3vw,15px);letter-spacing:0.04em;color:var(--ds-neutral-400);}

/* "Read the full bio →" / "See the approach →" arrow link */
.arrow-link{display:inline-flex;align-items:center;gap:10px;background:transparent;border:none;cursor:pointer;
  font-family:var(--font-text);font-size:14px;letter-spacing:0.06em;text-transform:uppercase;
  color:var(--ds-gold-400);padding:0;transition:gap .3s ease;text-decoration:none;}
.arrow-link:hover{gap:16px;}

/* Footer explore links */
.footlink{background:none;border:none;padding:0;cursor:pointer;font-family:var(--font-text);font-size:15px;
  color:var(--ds-neutral-300);transition:color .3s ease;text-align:left;text-decoration:none;}
.footlink:hover{color:#fff;}

/* News-coverage inline link (About → Service) */
.newslink{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-text);font-size:13px;
  letter-spacing:0.04em;color:var(--ds-gold-400);text-decoration:none;
  border-bottom:1px solid rgba(58,107,203,.5);padding-bottom:3px;}

/* Email link (kept visually identical to the design's plain text) */
.maillink{color:#fff;text-decoration:none;}
.maillink:hover{color:var(--ds-gold-400);}

/* Form fields — underline style */
.field-label{display:block;}
.field-label > span{display:block;font-size:12px;letter-spacing:0.14em;text-transform:uppercase;color:var(--ds-neutral-400);margin-bottom:10px;}
.field-input{width:100%;background:transparent;border:none;border-bottom:1px solid rgba(255,255,255,.4);
  color:#fff;font-family:var(--font-text);font-size:17px;padding:8px 0;outline:none;transition:border-color .3s ease;}
.field-input:focus{border-bottom-color:var(--ds-gold-500);box-shadow:0 1px 0 0 var(--ds-gold-500);}
textarea.field-input{resize:vertical;}

/* ===========================  REVEAL ANIMATION  ========================= */
@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.01ms !important;transition-duration:0.01ms !important;}
}

/* ===========================  RESPONSIVE / MOBILE  ====================== */
/* Fixed two-column content grids collapse to a single column on phones.
   (!important overrides the desktop grid-template-columns set inline.) */
@media (max-width: 768px){
  .ds-2col{ grid-template-columns: 1fr !important; gap: clamp(22px,6vw,40px) !important; }
}
/* Splash "Government / Commercial" doors stack on the narrowest screens */
@media (max-width: 480px){
  .splash-doors{ grid-template-columns: 1fr !important; }
}
/* Long CTA labels wrap instead of overflowing on small phones */
@media (max-width: 520px){
  .btn{ white-space: normal; text-align: center; line-height: 1.2; }
  .btn-lg{ height: auto; min-height: 54px; padding-top: 12px; padding-bottom: 12px; }
  .btn-md{ height: auto; min-height: 44px; padding-top: 10px; padding-bottom: 10px; }
  .btn-sm{ height: auto; min-height: 36px; padding-top: 8px; padding-bottom: 8px; }
}

/* ---- Mobile header (hamburger menu) ---- */
.nav-toggle{ display:none; }
.nav-menu{ display:contents; }           /* desktop: children flow into the header flex row */

@media (max-width: 900px){
  .site-header{ flex-wrap: wrap; }
  .nav-toggle{
    display:flex; flex-direction:column; justify-content:center; gap:5px;
    width:42px; height:42px; padding:0; background:transparent; border:none; cursor:pointer; flex-shrink:0;
  }
  .nav-toggle span{ display:block; width:24px; height:2px; background:#fff; border-radius:2px;
    transition:transform .3s ease, opacity .2s ease; }
  .site-header.is-open .nav-toggle span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
  .site-header.is-open .nav-toggle span:nth-child(2){ opacity:0; }
  .site-header.is-open .nav-toggle span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

  /* visibility keeps collapsed-menu links out of the keyboard tab order */
  .nav-menu{ display:block; order:3; width:100%; overflow:hidden; max-height:0; visibility:hidden;
    transition:max-height .35s ease, visibility 0s linear .35s; }
  .site-header.is-open .nav-menu{ max-height:75vh; visibility:visible;
    transition:max-height .35s ease, visibility 0s; }
  .nav-menu nav{ flex-direction:column; align-items:flex-start !important;
    flex-wrap:nowrap !important; gap:2px !important; padding-top:12px; }
  .nav-menu .nav-link{ padding:11px 0; font-size:16px; }
  .nav-menu .nav-actions{ flex-direction:column; align-items:flex-start; gap:16px; padding:14px 0 6px; }
  .nav-menu .btn{ width:100%; }
}