/* ============================================================
   CTOHA Landing Page — implemented from Claude Design prototype
   Tokens sourced from the CTOHA Design System (Brand Guidelines v1.0)
   ============================================================ */

/* ---------- Webfonts (self-hosted) ---------- */
@font-face{font-family:'Open Sans';font-style:normal;font-weight:400;font-display:swap;src:url('../assets/fonts/OpenSans-Regular.woff2') format('woff2')}
@font-face{font-family:'Open Sans';font-style:italic;font-weight:400;font-display:swap;src:url('../assets/fonts/OpenSans-Italic.woff2') format('woff2')}
@font-face{font-family:'Open Sans';font-style:normal;font-weight:600;font-display:swap;src:url('../assets/fonts/OpenSans-SemiBold.woff2') format('woff2')}
@font-face{font-family:'Open Sans';font-style:normal;font-weight:700;font-display:swap;src:url('../assets/fonts/OpenSans-Bold.woff2') format('woff2')}
@font-face{font-family:'Open Sans';font-style:normal;font-weight:800;font-display:swap;src:url('../assets/fonts/OpenSans-ExtraBold.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:400;font-display:swap;src:url('../assets/fonts/Inter-Regular.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:500;font-display:swap;src:url('../assets/fonts/Inter-Medium.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:700;font-display:swap;src:url('../assets/fonts/Inter-Bold.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:800;font-display:swap;src:url('../assets/fonts/Inter-ExtraBold.woff2') format('woff2')}

/* ---------- Tokens ---------- */
:root{
  --ctoha-green:#033431;
  --ctoha-off-white:#FFFFFB;
  --ctoha-light-gray:#F4F6F7;
  --ctoha-off-black:#011514;
  --ctoha-black:#000000;
  --ctoha-white:#FFFFFF;
  --ctoha-gray-300:#E3E8E9;
  --ctoha-gray-500:#6C7A79;
  --ctoha-green-hover:#0A4A44;

  --font-display:'Inter','Helvetica Neue',Helvetica,Arial,sans-serif;
  --font-body:'Open Sans','Segoe UI',Arial,sans-serif;
}

/* ---------- Base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ctoha-off-white);
  color:var(--ctoha-off-black);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
}
a{color:var(--ctoha-green)}
a:hover{color:var(--ctoha-off-black)}
img{max-width:100%}

.container{max-width:1200px;margin:0 auto;padding-left:40px;padding-right:40px}
.section-pad{padding-top:96px;padding-bottom:96px}
main section{scroll-margin-top:104px}

.stack-14{display:flex;flex-direction:column;gap:14px}
.stack-20{display:flex;flex-direction:column;gap:20px}
.stack-48{display:flex;flex-direction:column;gap:48px}

/* ---------- Type ---------- */
.eyebrow{
  font-weight:700;font-size:13px;letter-spacing:0.08em;
  text-transform:uppercase;color:var(--ctoha-green);
}
.eyebrow-on-dark{color:var(--ctoha-off-white);opacity:0.75}
.section-heading{
  margin:0;max-width:760px;
  font-family:var(--font-display);font-weight:700;
  font-size:36px;line-height:1.15;letter-spacing:-0.01em;
  color:var(--ctoha-black);
}
.section-heading.on-dark{color:var(--ctoha-off-white)}
.section-body{margin:0;max-width:760px;font-size:16px;line-height:1.6}
.on-dark-body{margin:0;max-width:760px;font-size:16px;line-height:1.6;color:var(--ctoha-off-white);opacity:0.85}
.on-dark-lead{margin:8px 0 0;max-width:760px;font-weight:700;font-size:19px;line-height:1.55;color:var(--ctoha-off-white)}
.inline-link{color:var(--ctoha-green);font-weight:700;text-decoration:none}
.inline-link:hover{color:var(--ctoha-off-black);text-decoration:underline}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;padding:16px 32px;border:none;cursor:pointer;
  font-family:var(--font-body);font-weight:700;font-size:16px;line-height:1;
  text-decoration:none;white-space:nowrap;
}
.btn-primary{background:var(--ctoha-green);color:var(--ctoha-off-white)}
.btn-primary:hover{background:var(--ctoha-green-hover);color:var(--ctoha-off-white)}
.btn-outline{background:var(--ctoha-white);color:var(--ctoha-black);border:2px solid var(--ctoha-black);padding:14px 30px}
.btn-outline:hover{background:var(--ctoha-light-gray);color:var(--ctoha-black)}
.btn-dark{background:var(--ctoha-off-black);color:var(--ctoha-white);padding:13px 26px;font-size:15px}
.btn-dark:hover{background:var(--ctoha-black);color:var(--ctoha-white)}
.btn-light{background:var(--ctoha-off-white);color:var(--ctoha-off-black)}
.btn-light:hover{background:var(--ctoha-white);color:var(--ctoha-off-black)}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--ctoha-white);
  border-bottom:1px solid var(--ctoha-gray-300);
}
.header-inner{
  height:104px;display:flex;align-items:center;
  justify-content:space-between;gap:32px;
}
.logo{display:inline-flex;align-items:flex-start;gap:3px;text-decoration:none}
.logo-box{
  width:34px;height:34px;border:1.7px solid var(--ctoha-black);
  font-family:var(--font-display);font-weight:700;font-size:30px;line-height:31px;
  text-align:center;color:var(--ctoha-black);
}
.logo-word{
  margin-left:5px;white-space:nowrap;color:var(--ctoha-black);
  font-family:var(--font-display);font-weight:700;font-size:30px;line-height:34px;
  letter-spacing:-0.016em;
}
.header-nav{display:flex;align-items:center;gap:36px}
.header-nav a:not(.btn){
  white-space:nowrap;font-weight:700;font-size:15px;
  color:var(--ctoha-off-black);text-decoration:none;
}
.header-nav a:not(.btn):hover{color:var(--ctoha-green)}

/* ---------- Hero ---------- */
.hero{
  display:grid;grid-template-columns:46fr 54fr;
  background:var(--ctoha-light-gray);min-height:560px;
}
.hero-copy{
  display:flex;flex-direction:column;justify-content:center;
  gap:24px;padding:80px 72px;
}
.hero-copy h1{
  margin:0;font-family:var(--font-display);font-weight:700;
  font-size:60px;line-height:1.08;letter-spacing:-0.02em;
  color:var(--ctoha-black);text-wrap:pretty;
}
.hero-copy p{margin:0;max-width:44ch;font-size:19px;line-height:1.55}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:8px}
.hero-image{
  width:100%;height:100%;min-height:320px;
  object-fit:cover;display:block;
}

/* ---------- Who We Are / Join CTA ---------- */
.who-we-are{background:var(--ctoha-green)}
.join-cta{background:var(--ctoha-green);padding:96px 40px}
.join-inner{
  display:flex;flex-direction:column;align-items:center;
  gap:28px;text-align:center;padding-left:0;padding-right:0;
}
.join-body{max-width:640px}

/* ---------- ETO → CTO chart ---------- */
.eto-cto{background:var(--ctoha-off-white)}
.chart-card{
  background:var(--ctoha-white);border:1px solid var(--ctoha-gray-300);
  padding:40px 40px 28px;display:flex;flex-direction:column;
}
.chart-row{display:grid;grid-template-columns:220px 1fr;gap:0 28px;align-items:center;padding:12px 0}
.chart-head{margin-bottom:12px;padding:0}
.chart-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.chart-cols span{
  text-align:center;font-weight:700;font-size:12px;
  letter-spacing:0.07em;text-transform:uppercase;
  color:var(--ctoha-off-black);opacity:0.6;
}
.chart-label{display:flex;flex-direction:column;gap:2px}
.chart-row-cto .chart-label{gap:4px;align-items:flex-start}
.chart-name{
  font-family:var(--font-display);font-weight:700;font-size:19px;
  letter-spacing:-0.01em;color:var(--ctoha-black);
}
.chart-name.is-green{color:var(--ctoha-green)}
.chart-sub{font-size:12.5px;line-height:1.4;color:var(--ctoha-off-black);opacity:0.6}
.chart-badge{
  background:var(--ctoha-green);color:var(--ctoha-off-white);
  font-size:10.5px;font-weight:700;letter-spacing:0.07em;
  text-transform:uppercase;padding:3px 8px;
}
.chart-bars{
  position:relative;display:grid;grid-template-columns:repeat(4,1fr);
  gap:8px;height:52px;
}
.cell.standard{background:var(--ctoha-green)}
.cell.custom{background:var(--ctoha-white);border:1.5px solid var(--ctoha-off-black)}
.order-point{position:absolute;top:-8px;bottom:-8px;width:4px;background:var(--ctoha-black)}
.op-eto{left:-6px}
.op-mto{left:calc((100% - 24px)/4 + 2px)}
.op-cto{left:calc((100% - 24px)/2 + 10px)}
.op-sto{left:calc((100% - 24px)*3/4 + 18px)}
.chart-axis{margin-top:4px;padding:0}
.chart-axis-labels{
  display:flex;justify-content:space-between;gap:16px;
  font-size:12.5px;color:var(--ctoha-off-black);opacity:0.6;
}
.chart-legend{
  display:flex;flex-wrap:wrap;gap:14px 32px;align-items:center;
  border-top:1px solid var(--ctoha-gray-300);margin-top:24px;padding-top:20px;
}
.legend-item{display:inline-flex;align-items:center;gap:10px;font-size:13.5px}
.swatch{flex:none}
.swatch-standard{width:14px;height:14px;background:var(--ctoha-green)}
.swatch-custom{width:14px;height:14px;background:var(--ctoha-white);border:1.5px solid var(--ctoha-off-black)}
.swatch-order{width:4px;height:16px;background:var(--ctoha-black)}
.chart-citation{margin:14px 0 0;font-size:12px;line-height:1.5;color:var(--ctoha-off-black);opacity:0.55}

/* ---------- What We Do ---------- */
.what-we-do{background:var(--ctoha-light-gray)}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:var(--ctoha-white);border:1px solid var(--ctoha-gray-300);
  display:flex;flex-direction:column;overflow:hidden;
}
.card img{display:block;width:100%;aspect-ratio:3/2;object-fit:cover}
.card-body{display:flex;flex-direction:column;gap:10px;padding:24px}
.card-body h3{
  margin:0;font-family:var(--font-display);font-weight:700;
  font-size:20px;line-height:1.25;letter-spacing:-0.01em;color:var(--ctoha-black);
}
.card-body p{margin:0;font-size:15px;line-height:1.6}

/* ---------- Stay Informed ---------- */
.stay-informed{background:var(--ctoha-off-white)}
.stay-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start}
.signup-panel{
  background:var(--ctoha-light-gray);border:1px solid var(--ctoha-gray-300);
  padding:40px;display:flex;flex-direction:column;
}
.signup-form{gap:20px}
.signup-success{gap:12px}
.signup-success h3{
  margin:0;font-family:var(--font-display);font-weight:700;
  font-size:22px;letter-spacing:-0.01em;color:var(--ctoha-black);
}
.signup-success p{margin:0;font-size:15px;line-height:1.6}
.success-link{color:var(--ctoha-green);font-weight:600;text-decoration:none}
.success-link:hover{color:var(--ctoha-off-black)}
.field{display:flex;flex-direction:column;gap:8px}
.field label{font-weight:700;font-size:14px;color:var(--ctoha-off-black)}
.field input{
  width:100%;border:1px solid var(--ctoha-gray-300);
  background:var(--ctoha-white);color:var(--ctoha-off-black);
  font-family:var(--font-body);font-size:15px;padding:13px 14px;
}
.field input:focus{border-color:var(--ctoha-green);outline:none}
.field input::placeholder{color:var(--ctoha-gray-500)}
.honeypot{display:none}
.form-error{margin:0;font-size:14px;line-height:1.5;color:#8A1F1A}
.form-error a{color:inherit;font-weight:700}
.signup-form button[disabled]{opacity:0.7;cursor:default}

/* ---------- Footer ---------- */
.site-footer{
  background:var(--ctoha-off-black);color:var(--ctoha-off-white);
  padding:64px 0 40px;
}
.footer-inner{display:flex;flex-direction:column;gap:48px}
.footer-top{
  display:flex;flex-wrap:wrap;justify-content:space-between;
  gap:40px;align-items:flex-start;
}
.footer-logo{display:inline-flex}
.fl-box{
  width:40px;height:40px;margin-right:3px;
  font-family:var(--font-display);font-weight:700;font-size:35px;
  text-align:center;
}
.fl-outline{border:2px solid var(--ctoha-off-white);color:var(--ctoha-off-white);line-height:36px}
.fl-gap{margin-right:4px}
.fl-solid{background:var(--ctoha-off-white);color:var(--ctoha-off-black);line-height:40px}
.fl-solid:last-child{margin-right:0}
.footer-nav{display:flex;flex-wrap:wrap;gap:28px;align-items:center}
.footer-nav a{
  font-weight:700;font-size:14px;color:var(--ctoha-off-white);
  text-decoration:none;opacity:0.85;
}
.footer-nav a:hover{opacity:1;text-decoration:underline}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;
  border-top:1px solid rgba(255,255,251,0.18);padding-top:24px;
  font-size:13px;line-height:1.5;color:rgba(255,255,251,0.66);
}
.footer-bottom a{color:inherit;font-weight:600;text-decoration:none}
.footer-bottom a:hover{color:var(--ctoha-off-white)}

/* ---------- Back to top ---------- */
.back-to-top{
  position:fixed;right:28px;bottom:28px;z-index:60;
  width:52px;height:52px;border:none;cursor:pointer;
  background:var(--ctoha-green);color:var(--ctoha-off-white);
  font-family:var(--font-display);font-weight:700;font-size:22px;line-height:1;
}
.back-to-top:hover{background:var(--ctoha-green-hover)}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .hero-copy{padding:64px 48px}
  .hero-copy h1{font-size:48px}
}

@media (max-width:960px){
  .header-inner{height:auto;flex-direction:column;align-items:flex-start;padding-top:16px;padding-bottom:16px;gap:14px}
  .header-nav{flex-wrap:wrap;gap:14px 20px}
  main section{scroll-margin-top:0}
}

@media (max-width:900px){
  .hero{grid-template-columns:1fr;min-height:0}
  .hero-image{min-height:0;height:360px}
  .stay-grid{grid-template-columns:1fr;gap:48px}
  .card-grid{grid-template-columns:1fr;max-width:520px}
}

@media (max-width:720px){
  .container{padding-left:24px;padding-right:24px}
  .section-pad{padding-top:64px;padding-bottom:64px}
  .join-cta{padding:64px 24px}
  .hero-copy{padding:56px 24px}
  .hero-copy h1{font-size:38px}
  .logo-box{width:28px;height:28px;font-size:24px;line-height:25px;border-width:1.5px}
  .logo-word{font-size:24px;line-height:28px}
  .chart-card{padding:24px 20px 20px}
  .chart-row{grid-template-columns:1fr;gap:10px}
  .chart-head > span:first-child,.chart-axis > span:first-child{display:none}
  .signup-panel{padding:28px 22px}
  .footer-bottom{flex-direction:column}
}