/* =========================================================
   towers-ai — landing page styles  ·  LIGHT THEME
   Palette: #FFFAF3 / #FFF2DB / #FFE5BF / #F62440
   The supplied palette carries no dark value, so a warm
   near-black and two darker reds are added for text so that
   every text/background pair clears WCAG AA (4.5:1).
   Contrast reference (measured):
     ink   #241C1A on #FFFAF3 .......... 16.1:1
     mute  #6E6157 on #FFE5BF ..........  4.9:1
     link  #C9102F on #FFF2DB ..........  5.3:1
     white on button #E51739 ...........  4.7:1
   #F62440 itself is reserved for decoration (rules, the
   lattice, dots, borders) where 4.5:1 does not apply.
   The previous dark theme is preserved as styles.dark.css.bak
   ========================================================= */

:root{
  /* surfaces — from the supplied palette */
  --paper:#FFFAF3;
  --cream:#FFF2DB;
  --peach:#FFE5BF;
  --card:#FFFFFF;

  /* ink — added; the palette has no dark value */
  --ink:#241C1A;
  --ink-soft:#4A3F39;
  --ink-mute:#6E6157;

  /* accent */
  --red:#F62440;        /* brand red — decorative use only */
  --red-btn:#E51739;    /* button fill, white text, 4.65:1 */
  --red-ink:#C9102F;    /* links, kickers, small text */
  --red-tint:rgba(246,36,64,.07);

  /* lines & shadow */
  --line:rgba(36,28,26,.10);
  --line-strong:rgba(36,28,26,.20);
  --shadow-sm:0 1px 2px rgba(74,52,30,.05), 0 2px 8px rgba(74,52,30,.05);
  --shadow-md:0 2px 4px rgba(74,52,30,.05), 0 12px 28px -8px rgba(74,52,30,.14);
  --shadow-lg:0 4px 8px rgba(74,52,30,.05), 0 22px 46px -14px rgba(74,52,30,.18);

  --radius:14px;
  --radius-sm:10px;

  --font-sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --font-serif:'Instrument Serif',Georgia,'Times New Roman',serif;

  --maxw:1140px;
  --pad:clamp(20px,5vw,40px);
}

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

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;background:var(--paper)}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink-soft);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img,svg{max-width:100%}

a{color:var(--red-ink);text-decoration:none}
a:hover{color:#A60D26}

:focus-visible{
  outline:2px solid var(--red-ink);
  outline-offset:3px;
  border-radius:4px;
}

::selection{background:rgba(246,36,64,.18);color:var(--ink)}

.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding-inline:var(--pad)}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--red-btn);color:#fff;
  padding:10px 16px;border-radius:0 0 8px 0;font-weight:600;
}
.skip-link:focus{left:0}

/* ---------- typography ---------- */
h1,h2,h3{color:var(--ink);margin:0;font-weight:400;letter-spacing:-.01em}

h1{
  font-family:var(--font-serif);
  font-size:clamp(2.6rem,6.4vw,4.6rem);
  line-height:1.06;
  letter-spacing:-.02em;
}
h1 em{font-style:italic;color:var(--red-ink)}

h2{
  font-family:var(--font-serif);
  font-size:clamp(1.9rem,3.6vw,2.85rem);
  line-height:1.15;
}

h3{
  font-family:var(--font-sans);
  font-size:1.06rem;
  font-weight:600;
  letter-spacing:-.005em;
}

p{margin:0 0 1rem}
p:last-child{margin-bottom:0}

.kicker{
  font-size:.74rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--red-ink);
  font-weight:600;
  margin-bottom:.85rem;
}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,250,243,.80);
  backdrop-filter:blur(14px) saturate(1.4);
  -webkit-backdrop-filter:blur(14px) saturate(1.4);
  border-bottom:1px solid transparent;
  transition:border-color .3s ease,background .3s ease,box-shadow .3s ease;
}
.site-header.scrolled{
  border-bottom-color:var(--line);
  background:rgba(255,250,243,.94);
  box-shadow:var(--shadow-sm);
}

.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:70px;
}

.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink)}
.brand:hover{color:var(--ink)}
.brand-mark{width:26px;height:26px;flex:none;stroke:var(--red);stroke-width:1.4;fill:none;stroke-linecap:round}
.brand-mark .mark-fine{stroke-width:.8;opacity:.55}
.brand-name{
  font-size:1.16rem;font-weight:600;letter-spacing:-.02em;color:var(--ink);
}
.brand-name.small{font-size:1.05rem}
.brand-dash{color:var(--red)}

.site-nav{display:flex;align-items:center;gap:30px}
.site-nav a{color:var(--ink-soft);font-size:.92rem;font-weight:500}
.site-nav a:hover{color:var(--ink)}
.site-nav .nav-cta{
  border:1px solid var(--line-strong);
  padding:8px 16px;border-radius:999px;color:var(--ink);
  background:var(--card);
  transition:border-color .2s ease,background .2s ease,box-shadow .2s ease;
}
.site-nav .nav-cta:hover{border-color:var(--red);background:var(--red-tint);color:var(--ink)}

.nav-toggle{
  display:none;background:none;border:0;cursor:pointer;
  width:40px;height:40px;padding:10px;
}
.nav-toggle span{display:block;height:1.5px;background:var(--ink);margin:5px 0;transition:transform .25s ease,opacity .25s ease}
.nav-toggle[aria-expanded="true"] span:first-child{transform:translateY(3.25px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:last-child{transform:translateY(-3.25px) rotate(-45deg)}

.mobile-nav{
  display:none;flex-direction:column;
  border-top:1px solid var(--line);
  background:var(--paper);
  padding:8px var(--pad) 18px;
  box-shadow:var(--shadow-md);
}
.mobile-nav a{
  color:var(--ink-soft);padding:12px 0;font-size:1rem;
  border-bottom:1px solid var(--line);
}
.mobile-nav a:last-child{border-bottom:0}
.mobile-nav[hidden]{display:none}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;
  padding:clamp(70px,12vw,130px) 0 clamp(60px,9vw,100px);
  background:linear-gradient(178deg,var(--paper) 0%,var(--paper) 32%,var(--cream) 78%,var(--peach) 100%);
}

.hero-bg{position:absolute;inset:0;pointer-events:none}
.hero-bg .lattice{position:absolute;top:-10%;right:-8%;width:min(720px,68%);height:120%;opacity:.9}

.glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.7}
.glow-a{width:520px;height:520px;top:-190px;right:-110px;background:radial-gradient(circle,rgba(255,229,191,.95),transparent 70%)}
.glow-b{width:460px;height:460px;bottom:-230px;left:-150px;background:radial-gradient(circle,rgba(246,36,64,.10),transparent 70%)}

.hero-inner{position:relative;max-width:830px}

.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-mute);font-weight:500;
  border:1px solid var(--line);border-radius:999px;
  padding:7px 18px 7px 13px;margin:0 0 1.9rem;
  background:rgba(255,255,255,.75);
  box-shadow:var(--shadow-sm);
  max-width:100%;
}
@media (max-width:420px){.eyebrow{font-size:.7rem;letter-spacing:.06em}}
.eyebrow .dot{
  width:6px;height:6px;border-radius:50%;background:var(--red);
  box-shadow:0 0 0 0 rgba(246,36,64,.6);
  animation:pulse 2.6s ease-out infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(246,36,64,.5)}
  70%{box-shadow:0 0 0 8px rgba(246,36,64,0)}
  100%{box-shadow:0 0 0 0 rgba(246,36,64,0)}
}

.lede{
  font-size:clamp(1.02rem,1.55vw,1.2rem);
  color:var(--ink-soft);
  max-width:60ch;
  margin:1.6rem 0 0;
}

.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:2.3rem}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font-family:inherit;font-size:.95rem;font-weight:600;
  padding:13px 26px;border-radius:999px;border:1px solid transparent;
  cursor:pointer;transition:transform .18s ease,background .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.btn-primary{
  background:var(--red-btn);color:#fff;
  box-shadow:0 10px 22px -10px rgba(197,16,47,.55);
}
.btn-primary:hover{background:var(--red-ink);color:#fff;transform:translateY(-1px);box-shadow:0 14px 26px -10px rgba(197,16,47,.6)}
.btn-ghost{border-color:var(--line-strong);color:var(--ink);background:var(--card)}
.btn-ghost:hover{border-color:var(--red);color:var(--ink);background:var(--red-tint)}
.btn-block{width:100%;margin-top:6px}

.hero-facts{
  list-style:none;margin:3.2rem 0 0;padding:2rem 0 0;
  border-top:1px solid var(--line-strong);
  display:flex;flex-wrap:wrap;gap:clamp(28px,6vw,64px);
}
.hero-facts li{display:flex;flex-direction:column;gap:2px}
.hero-facts strong{font-family:var(--font-serif);font-size:1.5rem;font-weight:400;color:var(--ink)}
.hero-facts span{font-size:.85rem;color:var(--ink-mute)}

/* ---------- sections ---------- */
.section{padding:clamp(70px,10vw,115px) 0}
.section-alt{background:var(--cream);border-block:1px solid var(--line)}

.section-head{max-width:640px;margin-bottom:clamp(40px,6vw,62px)}
.section-sub{margin-top:1.1rem;color:var(--ink-mute)}

/* ---------- capability cards ---------- */
.cards{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px;
}
@media (max-width:760px){.cards{grid-template-columns:1fr}}
.card{
  position:relative;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:30px 26px 28px;
  box-shadow:var(--shadow-sm);
  transition:border-color .25s ease,transform .25s ease,box-shadow .25s ease;
}
.card:hover{border-color:rgba(246,36,64,.35);transform:translateY(-3px);box-shadow:var(--shadow-md)}
.card-num{
  font-family:var(--font-serif);font-size:.95rem;color:var(--red-ink);
  letter-spacing:.1em;margin-bottom:1.1rem;
}
.card h3{margin-bottom:.75rem}
.card p{font-size:.94rem;color:var(--ink-mute)}
.card-list{
  list-style:none;margin:1.3rem 0 0;padding:1.2rem 0 0;
  border-top:1px solid var(--line);
  font-size:.87rem;color:var(--ink-soft);
}
.card-list li{position:relative;padding-left:18px;margin-bottom:.55rem}
.card-list li:last-child{margin-bottom:0}
.card-list li::before{
  content:"";position:absolute;left:0;top:.62em;
  width:6px;height:1.5px;background:var(--red);opacity:.9;
}

/* ---------- approach ---------- */
.approach-grid{
  display:grid;grid-template-columns:1fr 1fr;
  gap:clamp(36px,6vw,80px);align-items:start;
}
.approach-copy p{color:var(--ink-mute);margin-top:1.2rem}
.approach-copy h2{margin-bottom:.4rem}

.principles{display:grid;gap:26px}
.principle{position:relative;padding-left:22px}
.p-rule{position:absolute;left:0;top:.45em;bottom:.2em;width:2px;background:linear-gradient(var(--red),rgba(246,36,64,0));border-radius:2px;opacity:.85}
.principle h3{margin-bottom:.35rem}
.principle p{font-size:.92rem;color:var(--ink-mute)}

/* ---------- contact ---------- */
.contact-wrap{
  display:grid;grid-template-columns:1fr 1fr;
  gap:clamp(36px,6vw,72px);align-items:start;
}
.contact-copy p{color:var(--ink-mute);margin-top:1.1rem}
.contact-direct{font-size:.94rem;margin-top:1.6rem!important;color:var(--ink-soft)!important}

.contact-form{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(24px,3.5vw,34px);
  box-shadow:var(--shadow-lg);
}
.field{margin-bottom:18px}
.field label{
  display:block;font-size:.83rem;font-weight:500;
  color:var(--ink-soft);margin-bottom:7px;letter-spacing:.01em;
}
.field .opt{color:var(--ink-mute);font-weight:400}
.field input,.field textarea{
  width:100%;font-family:inherit;font-size:.95rem;color:var(--ink);
  background:var(--paper);
  border:1px solid var(--line-strong);
  border-radius:var(--radius-sm);
  padding:12px 14px;
  transition:border-color .2s ease,background .2s ease,box-shadow .2s ease;
}
.field textarea{resize:vertical;min-height:110px}
.field input::placeholder,.field textarea::placeholder{color:var(--ink-mute)}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--red);background:#fff;
  box-shadow:0 0 0 3px rgba(246,36,64,.14);
}
.field input[aria-invalid="true"],.field textarea[aria-invalid="true"]{border-color:var(--red-ink)}

.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

.form-note{
  font-size:.85rem;margin-top:14px;min-height:1.2em;
  color:var(--ink-mute);
}
.form-note.ok{color:#1F7A4D}
.form-note.err{color:var(--red-ink)}

/* ---------- footer ---------- */
.site-footer{
  background:var(--peach);
  border-top:1px solid var(--line);
  padding:clamp(44px,6vw,64px) 0 26px;
  color:var(--ink-soft);
}
.footer-inner{
  display:flex;flex-wrap:wrap;gap:28px;
  justify-content:space-between;align-items:flex-start;
  padding-bottom:30px;border-bottom:1px solid rgba(36,28,26,.14);
}
.footer-brand p{font-size:.9rem;color:var(--ink-mute);margin-top:.5rem;max-width:34ch}
.footer-links{display:flex;flex-wrap:wrap;gap:24px;font-size:.9rem}
.footer-links a{color:var(--ink-soft)}
.footer-links a:hover{color:var(--red-ink)}

.footer-base{
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  padding-top:22px;font-size:.83rem;color:var(--ink-mute);
}
.footer-base a{color:var(--ink-mute)}
.footer-base a:hover{color:var(--red-ink)}

/* ---------- reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}}
@media print{.reveal{opacity:1!important;transform:none!important}}

/* ---------- print ---------- */
@media print{
  .site-header,.nav-toggle,.mobile-nav,.hero-bg,.contact-form{display:none!important}
  body{background:#fff;color:#000}
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .approach-grid,.contact-wrap{grid-template-columns:1fr}
}
@media (max-width:820px){
  .hero-bg .lattice{width:120%;right:-30%;opacity:.5}
}
@media (max-width:720px){
  .site-nav{display:none}
  .nav-toggle{display:block}
  .mobile-nav{display:flex}
  .hero-facts{gap:24px}
  .hero-facts li{min-width:44%}
  .footer-inner{flex-direction:column}
}