/* ===== Avatech — Sentiment Intelligence ===== */

:root{
  --teal: #008eb2;
  --teal-dark: #006f8c;
  --coral: #ff5055;
  --dark: #0e181b;
  --gray: #6b7376;
  --bg: #f4f9fa;
  --bg-alt: #eaf2f4;
  --white: #ffffff;
  --border: rgba(14,24,27,0.08);
  --shadow: 0 20px 50px -20px rgba(14,24,27,0.15);
  --radius: 20px;
  --container: 1160px;
  --ease: cubic-bezier(.19,1,.22,1);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--dark);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img{ display:block; max-width:100%; }
a{ color: inherit; text-decoration: none; }
h1,h2,h3,h4{ margin:0; font-weight: 700; letter-spacing: -0.02em; }
p{ margin:0; }
ul{ margin:0; padding:0; list-style:none; }
svg{ display:block; }
button{ font-family: inherit; }

::selection{ background: var(--teal); color: var(--white); }

/* scrollbar */
html{ scrollbar-color: var(--gray) transparent; scrollbar-width: thin; }
::-webkit-scrollbar{ width: 11px; }
::-webkit-scrollbar-track{ background: transparent; }
::-webkit-scrollbar-thumb{ background: rgba(14,24,27,0.18); border-radius: 999px; border: 3px solid var(--bg); }
::-webkit-scrollbar-thumb:hover{ background: rgba(14,24,27,0.32); }

/* focus states — keyboard only */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
summary:focus-visible{
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link{
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 1000;
  background: var(--dark);
  color: var(--white);
  padding: 12px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: .9rem;
  transition: top .25s var(--ease);
}
.skip-link:focus{ top: 16px; }

/* reduced motion */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .blob, [data-parallax]{ transform:none !important; }
}

.container{
  width:100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- background decor / parallax ---------- */
.bg-decor{
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.blob{
  position:absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: .35;
  will-change: transform;
}
.blob-1{ width: 520px; height: 520px; top: -180px; right: -120px; background: radial-gradient(circle at 30% 30%, var(--teal), transparent 70%); }
.blob-2{ width: 420px; height: 420px; top: 620px; left: -160px; background: radial-gradient(circle at 60% 40%, var(--coral), transparent 70%); opacity:.22; }
.blob-3{ width: 480px; height: 480px; top: 1500px; right: -140px; background: radial-gradient(circle at 40% 40%, var(--teal), transparent 70%); opacity:.18; }

.dot{
  position:absolute;
  width:8px; height:8px;
  border-radius:50%;
  background: var(--teal);
  opacity:.5;
  animation: float 9s ease-in-out infinite;
}
.dot.d1{ top:18%; left:8%; animation-delay:0s; }
.dot.d2{ top:35%; left:92%; background:var(--coral); animation-delay:1.4s; }
.dot.d3{ top:70%; left:14%; animation-delay:2.6s; }
.dot.d4{ top:85%; left:80%; background:var(--coral); animation-delay:.8s; }

@keyframes float{
  0%,100%{ transform: translateY(0) translateX(0); }
  50%{ transform: translateY(-26px) translateX(10px); }
}

/* ---------- reveal on scroll ---------- */
.reveal{
  opacity:0;
  transform: translateY(28px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.in{
  opacity:1;
  transform: translateY(0);
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor:pointer;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
  white-space: nowrap;
}
.btn-primary{
  background: var(--dark);
  color: var(--white);
  box-shadow: 0 10px 24px -8px rgba(14,24,27,.4);
}
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 16px 30px -8px rgba(14,24,27,.45); }
.btn-primary:active{ transform: translateY(0); box-shadow: 0 6px 14px -6px rgba(14,24,27,.4); }
.btn-ghost{
  background: transparent;
  color: var(--dark);
  border-color: var(--border);
}
.btn-ghost:hover{ border-color: var(--dark); transform: translateY(-2px); }
.btn-ghost:active{ transform: translateY(0); }
.btn-sm{ padding: 10px 20px; font-size: .85rem; }
.btn-lg{ padding: 16px 34px; font-size: 1rem; }
.btn-full{ width:100%; }
.btn:disabled{ opacity:.65; cursor: not-allowed; transform:none !important; }
.btn-primary:focus-visible,
.btn-ghost:focus-visible{ outline-offset: 4px; }

/* ---------- nav ---------- */
.nav{
  position: sticky;
  top:0;
  z-index: 100;
  padding: 18px 0;
  transition: padding .3s var(--ease), background .3s var(--ease), box-shadow .3s var(--ease), backdrop-filter .3s var(--ease);
}
.nav.scrolled{
  padding: 10px 0;
  background: rgba(244,249,250,0.75);
  backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 8px 30px -12px rgba(14,24,27,.15);
}
.nav-inner{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
  display:flex;
  align-items:center;
  gap: 24px;
}
.nav-logo{ margin-right:auto; display:flex; align-items:center; }
.nav-links{ display:flex; align-items:center; gap: 28px; }
.nav-links a{
  font-size: .92rem;
  font-weight: 600;
  color: var(--gray);
  position:relative;
  padding: 4px 0;
  transition: color .2s;
}
.nav-links a::after{
  content:"";
  position:absolute;
  left:0; bottom:-2px;
  width:0; height:2px;
  background: var(--teal);
  transition: width .25s var(--ease);
}
.nav-links a:hover,
.nav-links a.active{ color: var(--dark); }
.nav-links a.active::after,
.nav-links a:hover::after{ width:100%; }

.nav-toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  background:none;
  border:none;
  cursor:pointer;
  padding: 6px;
  border-radius: 8px;
}
.nav-toggle span{ width:22px; height:2px; background: var(--dark); border-radius:2px; transition: transform .25s var(--ease), opacity .25s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

.nav-backdrop{
  position: fixed;
  inset: 0;
  background: rgba(14,24,27,.35);
  backdrop-filter: blur(2px);
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s var(--ease);
}
.nav-backdrop.show{ opacity: 1; pointer-events: auto; }

/* ---------- hero ---------- */
.hero{
  position: relative;
  z-index: 1;
  padding: 100px 0 60px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.1fr 1fr;
  align-items:center;
  gap: 40px;
}
.eyebrow{
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: .78rem;
  font-weight: 700;
  color: var(--teal-dark);
  margin: 0 0 14px;
}
.hero h1{
  font-size: clamp(2.4rem, 4.6vw, 3.6rem);
  line-height: 1.08;
  color: var(--dark);
}
.text-accent{ color: var(--coral); }
.hero-sub{
  margin-top: 22px;
  max-width: 520px;
  font-size: 1.08rem;
  line-height: 1.6;
  color: var(--gray);
}
.hero-actions{
  margin-top: 34px;
  display:flex;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-tags{
  margin-top: 40px;
  display:flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-tags span{
  font-size: .8rem;
  font-weight: 600;
  color: var(--teal-dark);
  background: rgba(0,142,178,0.08);
  border: 1px solid rgba(0,142,178,0.18);
  padding: 7px 14px;
  border-radius: 999px;
}

/* hero visual — sentiment gauge */
.hero-visual{ display:flex; justify-content:center; }
.gauge-card{
  position: relative;
  width: 340px;
  height: 340px;
  background: var(--white);
  border-radius: 28px;
  box-shadow: var(--shadow);
  display:flex;
  align-items:center;
  justify-content:center;
  border: 1px solid var(--border);
  animation: cardfloat 8s ease-in-out infinite;
}
@keyframes cardfloat{
  0%,100%{ transform: translateY(0) rotate(0deg); }
  50%{ transform: translateY(-10px) rotate(.4deg); }
}
.gauge{ width: 240px; height: 240px; }
.gauge-track{ fill:none; stroke: rgba(14,24,27,0.06); stroke-width: 14; }
.gauge-arc{ fill:none; stroke-width: 14; stroke-linecap: round; }
.gauge-arc-teal{ stroke: var(--teal); }
.gauge-arc-coral{ stroke: var(--coral); opacity:.55; }
.gauge-needle line{ stroke: var(--dark); stroke-width: 5; stroke-linecap: round; }
.gauge-hub{ fill: var(--dark); }
.gauge-needle{
  transform-origin: 120px 120px;
  animation: needle 7s ease-in-out infinite;
}
@keyframes needle{
  0%,100%{ transform: rotate(-18deg); }
  50%{ transform: rotate(22deg); }
}
.gauge-label{
  position:absolute;
  display:flex;
  flex-direction:column;
  align-items:center;
  top: 50%;
  left: 50%;
  transform: translate(-50%, 10px);
}
.gauge-score{ font-size: 2.6rem; font-weight: 800; color: var(--dark); line-height:1; }
.gauge-score-caption{ font-size: .72rem; color: var(--gray); text-transform: uppercase; letter-spacing: .08em; margin-top:4px; }

.gauge-pill{
  position:absolute;
  background: var(--white);
  border: 1px solid var(--border);
  box-shadow: 0 12px 24px -12px rgba(14,24,27,.25);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: .78rem;
  font-weight: 600;
  display:flex;
  align-items:center;
  gap:8px;
  animation: bob 6s ease-in-out infinite;
}
.gauge-pill-1{ top: -6px; right: -6px; color: var(--dark); }
.gauge-pill-2{ bottom: 4px; left: -18px; color: var(--teal-dark); animation-delay: 1.5s; }
@keyframes bob{
  0%,100%{ transform: translateY(0); }
  50%{ transform: translateY(-8px); }
}
.pulse{
  width:8px; height:8px; border-radius:50%;
  background: var(--coral);
  box-shadow: 0 0 0 0 rgba(255,80,85,.5);
  animation: pulse 1.8s infinite;
}
@keyframes pulse{
  0%{ box-shadow: 0 0 0 0 rgba(255,80,85,.5); }
  70%{ box-shadow: 0 0 0 8px rgba(255,80,85,0); }
  100%{ box-shadow: 0 0 0 0 rgba(255,80,85,0); }
}

.scroll-cue{
  display:flex;
  justify-content:center;
  margin-top: 50px;
}
.scroll-cue span{
  width: 22px; height: 36px;
  border: 2px solid var(--border);
  border-radius: 14px;
  position: relative;
}
.scroll-cue span::after{
  content:"";
  position:absolute;
  top:6px; left:50%;
  width:4px; height:4px;
  border-radius:50%;
  background: var(--teal);
  transform: translateX(-50%);
  animation: scrolldown 1.8s infinite;
}
@keyframes scrolldown{
  0%{ opacity:1; top:6px; }
  70%{ opacity:0; top:20px; }
  100%{ opacity:0; top:6px; }
}

/* ---------- capability strip ---------- */
.strip{
  position: relative; z-index:1;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.5);
}
.strip-inner{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 30px 28px;
  gap: 20px;
}
.strip-item{ display:flex; flex-direction:column; gap:6px; text-align:center; }
.strip-item strong{ color: var(--dark); font-size: 1.05rem; }
.strip-item span{ color: var(--gray); font-size: .85rem; }

/* ---------- sections ---------- */
#hero, #platform, #how, #sources, #why, #faq, #contact{ scroll-margin-top: 84px; }
.section{ position:relative; z-index:1; padding: 96px 0; }
.section-alt{ background: var(--bg-alt); }
.section-head{ max-width: 640px; margin: 0 auto 56px; text-align:center; }
.section-head h2{ font-size: clamp(1.8rem, 3vw, 2.4rem); margin-top: 6px; color: var(--dark); }
.section-sub{ margin-top: 16px; color: var(--gray); font-size: 1.05rem; line-height:1.6; }
.section-head .eyebrow{ text-align:center; }

/* cards */
.cards{ display:grid; gap: 24px; }
.cards-4{ grid-template-columns: repeat(4, 1fr); }
.card{
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.card:hover{ transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.card-icon{
  width: 46px; height:46px;
  border-radius: 14px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom: 18px;
  transition: transform .35s var(--ease), background .35s var(--ease), color .35s var(--ease);
}
.card-icon svg{ width: 22px; height:22px; }
.icon-teal{ background: rgba(0,142,178,0.1); color: var(--teal); }
.icon-coral{ background: rgba(255,80,85,0.1); color: var(--coral); }
.card:hover .icon-teal{ background: var(--teal); color: var(--white); transform: rotate(-6deg) scale(1.06); }
.card:hover .icon-coral{ background: var(--coral); color: var(--white); transform: rotate(-6deg) scale(1.06); }
.card h3{ font-size: 1.05rem; color: var(--dark); margin-bottom: 10px; }
.card p{ color: var(--gray); font-size: .93rem; line-height: 1.6; }

/* steps */
.steps{
  position: relative;
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.steps-line{
  position:absolute;
  top: 22px;
  left: 6%;
  right: 6%;
  height: 2px;
  background: linear-gradient(to right, var(--teal), var(--coral));
  opacity:.25;
}
.step{ position:relative; background: var(--white); border:1px solid var(--border); border-radius: var(--radius); padding: 28px 22px; }
.step-num{
  display:inline-flex;
  align-items:center; justify-content:center;
  width: 44px; height:44px;
  border-radius: 50%;
  background: var(--dark);
  color: var(--white);
  font-weight:700;
  font-size: .85rem;
  margin-bottom: 18px;
}
.step h3{ font-size: 1.05rem; color: var(--dark); margin-bottom: 8px; }
.step p{ color: var(--gray); font-size: .9rem; line-height:1.6; }

/* sources */
.source-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.source-item{
  display:flex;
  align-items:center;
  gap: 14px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 22px;
  font-weight:600;
  color: var(--dark);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.source-item:hover{ transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.source-item svg{ width: 26px; height:26px; color: var(--teal); flex-shrink:0; transition: transform .3s var(--ease); }
.source-item:hover svg{ transform: scale(1.12); color: var(--coral); }

/* why */
.why-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items:center; }
.why-list{ margin-top: 30px; display:flex; flex-direction:column; gap: 26px; }
.why-list li{ display:flex; gap: 16px; align-items:flex-start; }
.why-mark{
  flex-shrink:0;
  width: 10px; height:10px;
  margin-top: 6px;
  border-radius: 3px;
  background: var(--coral);
  transform: rotate(45deg);
}
.why-list h4{ font-size: 1.02rem; color: var(--dark); margin-bottom: 6px; }
.why-list p{ color: var(--gray); font-size: .92rem; line-height:1.6; }

.trend-card{
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.trend-head{ display:flex; justify-content:space-between; align-items:center; font-size: .85rem; color: var(--gray); margin-bottom: 18px; }
.trend-up{ color: var(--teal-dark); font-weight:700; background: rgba(0,142,178,.1); padding: 4px 10px; border-radius: 999px; }
.trend-svg{ width:100%; height: 140px; }
.trend-line{
  fill:none; stroke: var(--teal); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: 420;
  stroke-dashoffset: 420;
  transition: stroke-dashoffset 1.6s var(--ease);
}
.trend-line.drawn{ stroke-dashoffset: 0; }
.trend-fill{
  fill: rgba(0,142,178,.08); stroke:none;
  opacity: 0;
  transition: opacity 1s var(--ease) .6s;
}
.trend-fill.drawn{ opacity: 1; }

/* faq */
.faq-list{ max-width: 760px; margin: 0 auto; display:flex; flex-direction:column; gap: 14px; }
.faq-item{
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  transition: border-color .25s, box-shadow .25s;
  overflow: hidden;
}
.faq-item:has(.faq-trigger[aria-expanded="true"]){
  border-color: rgba(0,142,178,0.25);
  box-shadow: 0 12px 30px -18px rgba(14,24,27,.25);
}
.faq-q{ margin:0; }
.faq-trigger{
  width: 100%;
  cursor: pointer;
  background: none;
  border: none;
  text-align: left;
  padding: 20px 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 16px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--dark);
  transition: color .2s;
}
.faq-trigger:hover{ color: var(--teal-dark); }
.faq-icon{
  flex-shrink:0;
  width: 26px; height:26px;
  border-radius:50%;
  background: rgba(0,142,178,0.1);
  color: var(--teal-dark);
  position: relative;
  transition: transform .3s var(--ease), background .3s, color .3s;
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  top:50%; left:50%;
  background: currentColor;
  transition: transform .3s var(--ease);
}
.faq-icon::before{ width:10px; height:2px; transform: translate(-50%,-50%); }
.faq-icon::after{ width:2px; height:10px; transform: translate(-50%,-50%); }
.faq-trigger[aria-expanded="true"] .faq-icon{ transform: rotate(180deg); background: rgba(255,80,85,0.12); color: var(--coral); }
.faq-trigger[aria-expanded="true"] .faq-icon::after{ transform: translate(-50%,-50%) scaleY(0); }
.faq-panel{
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .35s var(--ease);
}
.faq-q:has(.faq-trigger[aria-expanded="true"]) + .faq-panel{ grid-template-rows: 1fr; }
.faq-panel > p{
  overflow: hidden;
  min-height: 0;
  padding: 0 24px;
  color: var(--gray);
  font-size: .93rem;
  line-height:1.6;
}
.faq-q:has(.faq-trigger[aria-expanded="true"]) + .faq-panel > p{ padding-bottom: 22px; }
@supports not (grid-template-rows: 0fr){
  .faq-panel{ display:block; height:0; overflow:hidden; transition: height .35s var(--ease); }
}

/* cta */
.cta{ position:relative; z-index:1; padding: 90px 0; }
.cta-inner{
  text-align:center;
  background: var(--dark);
  color: var(--white);
  border-radius: 32px;
  padding: 64px 40px;
  max-width: 900px;
}
.cta h2{ font-size: clamp(1.6rem, 3vw, 2.2rem); }
.cta p{ margin-top: 14px; color: rgba(255,255,255,.7); max-width: 460px; margin-left:auto; margin-right:auto; }
.cta .btn-primary{ margin-top: 30px; background: var(--white); color: var(--dark); }
.cta .btn-primary:hover{ box-shadow: 0 16px 30px -8px rgba(0,0,0,.4); }

/* contact */
.contact-grid{ display:grid; grid-template-columns: .9fr 1.1fr; gap: 60px; }
.contact-email{
  position: relative;
  display:inline-flex;
  align-items: baseline;
  gap: 10px;
  margin-top: 26px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--teal-dark);
  border-bottom: 2px solid transparent;
  transition: border-color .2s;
  cursor: pointer;
}
.contact-email:hover{ border-color: var(--teal-dark); }
.copy-tip{
  font-size: .72rem;
  font-weight: 600;
  color: var(--gray);
  background: var(--bg-alt);
  border-radius: 999px;
  padding: 4px 10px;
  opacity: 0;
  transform: translateY(2px);
  transition: opacity .2s, transform .2s;
}
.contact-email:hover .copy-tip{ opacity: 1; transform: translateY(0); }
.contact-form{
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px;
  box-shadow: var(--shadow);
  display:flex;
  flex-direction:column;
  gap: 18px;
}
.form-row{ display:flex; flex-direction:column; gap: 8px; }
.form-row label{ font-size: .82rem; font-weight:600; color: var(--dark); }
.form-row input,
.form-row textarea{
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: .95rem;
  font-family: inherit;
  color: var(--dark);
  resize: vertical;
  transition: border-color .2s, box-shadow .2s;
}
.form-row input:focus,
.form-row textarea:focus{
  outline:none;
  border-color: var(--teal);
  box-shadow: 0 0 0 4px rgba(0,142,178,.12);
}
.form-note{ font-size: .78rem; color: var(--gray); text-align:center; }

/* footer */
.footer{ position:relative; z-index:1; border-top: 1px solid var(--border); padding: 40px 0 24px; }
.footer-inner{ display:flex; align-items:center; gap: 28px; flex-wrap:wrap; justify-content:space-between; }
.footer-links{ display:flex; gap: 22px; flex-wrap:wrap; }
.footer-links a{ font-size: .88rem; color: var(--gray); font-weight:600; }
.footer-links a:hover{ color: var(--dark); }
.footer-email{ font-weight:700; color: var(--teal-dark); font-size: .9rem; }
.footer-bottom{
  display:flex; justify-content:space-between;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: .78rem;
  color: var(--gray);
}

/* back to top */
.back-to-top{
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 80;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--dark);
  color: var(--white);
  border: none;
  cursor: pointer;
  display:flex; align-items:center; justify-content:center;
  box-shadow: 0 12px 24px -8px rgba(14,24,27,.4);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity .3s var(--ease), transform .3s var(--ease), background .2s;
}
.back-to-top svg{ width: 18px; height:18px; }
.back-to-top.show{ opacity:1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover{ background: var(--teal-dark); }

/* toast */
.toast{
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 16px);
  background: var(--dark);
  color: var(--white);
  font-size: .85rem;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 999px;
  box-shadow: 0 16px 32px -12px rgba(14,24,27,.5);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}
.toast.show{ opacity: 1; transform: translate(-50%, 0); }

/* form validation */
.form-row input.invalid,
.form-row textarea.invalid{
  border-color: var(--coral);
  box-shadow: 0 0 0 4px rgba(255,80,85,.12);
}
.form-row.shake{ animation: shake .4s var(--ease); }
@keyframes shake{
  0%,100%{ transform: translateX(0); }
  25%{ transform: translateX(-6px); }
  75%{ transform: translateX(6px); }
}

/* ---------- responsive ---------- */
@media (max-width: 980px){
  .hero-grid{ grid-template-columns: 1fr; }
  .hero-visual{ order:-1; }
  .cards-4{ grid-template-columns: repeat(2, 1fr); }
  .steps{ grid-template-columns: repeat(2, 1fr); }
  .steps-line{ display:none; }
  .strip-inner{ grid-template-columns: repeat(2,1fr); }
  .why-grid{ grid-template-columns: 1fr; gap: 44px; }
  .contact-grid{ grid-template-columns: 1fr; gap: 40px; }
  .source-grid{ grid-template-columns: repeat(2,1fr); }
  .section{ padding: 72px 0; }
  .cta{ padding: 64px 0; }
}
.nav-cta-mobile{ display:none; }

@media (max-width: 760px){
  body.menu-open{ overflow: hidden; }
  .nav-links{
    position:absolute;
    top: calc(100% + 8px);
    left: 16px; right:16px;
    background: var(--white);
    flex-direction:column;
    align-items:stretch;
    padding: 22px 24px;
    gap: 18px;
    box-shadow: var(--shadow);
    border-radius: 20px;
    border: 1px solid var(--border);
    z-index: 95;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px) scale(.98);
    transform-origin: top right;
    transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s;
  }
  .nav-links a{ font-size: 1rem; }
  .nav-links.open{ visibility: visible; opacity:1; transform: translateY(0) scale(1); }
  .nav-cta{ display:none; }
  .nav-cta-mobile{ display:inline-flex; margin-top: 4px; }
  .nav-toggle{ display:flex; }
  .cards-4{ grid-template-columns: 1fr; }
  .steps{ grid-template-columns: 1fr; }
  .strip-inner{ grid-template-columns: repeat(2,1fr); }
  .source-grid{ grid-template-columns: 1fr; }
  .gauge-card{ width: 280px; height: 280px; }
  .gauge{ width: 200px; height:200px; }

  .hero{ padding: 36px 0 40px; }
  .hero-grid{ gap: 32px; }
  .hero-actions{ margin-top: 26px; }
  .hero-tags{ margin-top: 28px; gap: 10px; }
  .scroll-cue{ margin-top: 32px; }

  .section{ padding: 56px 0; }
  .section-head{ margin-bottom: 40px; }
  .section-sub{ font-size: 1rem; }

  .strip-inner{ padding: 26px 28px; gap: 24px 20px; }

  .cards{ gap: 18px; }
  .card{ padding: 26px 22px; }

  .steps{ gap: 16px; }
  .step{ padding: 24px 20px; }

  .source-grid{ gap: 14px; }

  .faq-list{ gap: 12px; }
  .faq-trigger{ padding: 18px 20px; font-size: .95rem; }

  .cta{ padding: 48px 0; }
  .cta-inner{ padding: 44px 26px; border-radius: 24px; }
  .cta .btn-primary{ margin-top: 24px; }

  .contact-form{ padding: 26px; }
  .contact-copy .section-sub{ margin-bottom: 4px; }

  .footer{ padding: 32px 0 20px; }
  .footer-bottom{ flex-direction: column; gap: 6px; text-align:center; }

  .back-to-top{ width: 42px; height:42px; right: 16px; bottom: 16px; }
}

@media (max-width: 420px){
  .container{ padding: 0 20px; }
  .nav-inner{ padding: 0 20px; }
  .hero h1{ font-size: 2.1rem; }
  .gauge-card{ width: 240px; height: 240px; }
  .gauge{ width: 172px; height:172px; }
  .gauge-score{ font-size: 2.1rem; }
  .gauge-pill{ font-size: .72rem; padding: 7px 11px; }
  .gauge-pill-2{ left: -8px; }
  .gauge-pill-1{ right: -8px; }
  .cta-inner h2{ font-size: 1.5rem; }
}