/* ============================================================
   AquaSentinel — Design tokens
   Palette: deep ink water + teal/cyan flow accent + amber alert
   Type: Space Grotesk (display) / Inter (body) / IBM Plex Mono (data)
   Signature: animated flow schematic (source → pump → tank → tap)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root{
  --ink-900:#0B1F2A;
  --ink-800:#122C3A;
  --teal-700:#0E7C86;
  --teal-600:#12969F;
  --cyan-400:#4FC1D6;
  --amber-500:#E8A33D;
  --paper-50:#F5F8F8;
  --paper-100:#EBF1F1;
  --slate-700:#33454C;
  --slate-500:#5D7178;
  --white:#FFFFFF;
  --green-600:#2F9E63;
  --grey-400:#9AA8AC;

  --font-display:'Space Grotesk', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;

  --radius-md:10px;
  --radius-lg:18px;
  --shadow-card: 0 8px 30px rgba(11,31,42,0.08);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--slate-700);
  background:var(--paper-50);
  line-height:1.6;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--ink-900);
  line-height:1.15;
  margin:0 0 .5em;
}
p{margin:0 0 1em;}
a{color:inherit; text-decoration:none;}
img{max-width:100%; display:block;}
.container{max-width:1180px; margin:0 auto; padding:0 24px;}
.mono{font-family:var(--font-mono); letter-spacing:.02em;}

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 26px; border-radius:999px; font-weight:600; font-size:15px;
  border:1px solid transparent; cursor:pointer; transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  font-family:var(--font-body);
}
.btn-primary{background:var(--teal-700); color:var(--white);}
.btn-primary:hover{background:var(--teal-600); box-shadow:0 6px 18px rgba(14,124,134,.35); transform:translateY(-1px);}
.btn-amber{background:var(--amber-500); color:var(--ink-900);}
.btn-amber:hover{box-shadow:0 6px 18px rgba(232,163,61,.4); transform:translateY(-1px);}
.btn-ghost{background:transparent; color:var(--white); border-color:rgba(255,255,255,.35);}
.btn-ghost:hover{background:rgba(255,255,255,.08);}
.btn-outline{background:transparent; color:var(--teal-700); border-color:var(--teal-700);}
.btn-outline:hover{background:var(--teal-700); color:var(--white);}
.btn-block{width:100%;}
.btn-sm{padding:8px 16px; font-size:13px;}

/* Top nav */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(11,31,42,.92); backdrop-filter:blur(8px);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.nav-wrap{display:flex; align-items:center; justify-content:space-between; padding:16px 24px; max-width:1180px; margin:0 auto;}
.brand{display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:700; font-size:20px; color:var(--white);}
.brand-mark{width:34px; height:34px;}
.nav-links{display:flex; align-items:center; gap:32px; list-style:none; margin:0; padding:0;}
.nav-links a{color:rgba(255,255,255,.82); font-size:15px; font-weight:500; transition:color .15s;}
.nav-links a:hover, .nav-links a.active{color:var(--cyan-400);}
.nav-cta{display:flex; gap:12px; align-items:center;}
.nav-toggle{display:none; background:none; border:none; color:var(--white); font-size:24px; cursor:pointer;}

@media (max-width: 900px){
  .nav-links{
    position:absolute; top:100%; left:0; right:0; background:var(--ink-900);
    flex-direction:column; align-items:flex-start; padding:20px 24px; gap:18px;
    display:none; border-bottom:1px solid rgba(255,255,255,.08);
  }
  .nav-links.open{display:flex;}
  .nav-toggle{display:block;}
  .nav-cta .btn{display:none;}
}

/* Hero */
.hero{
  background:radial-gradient(1100px 500px at 80% -10%, rgba(79,193,214,.16), transparent 60%), var(--ink-900);
  color:var(--white);
  padding:90px 0 70px;
  overflow:hidden;
}
.hero-grid{display:grid; grid-template-columns:1.05fr 1fr; gap:56px; align-items:center;}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px; font-family:var(--font-mono); font-size:12px;
  letter-spacing:.08em; text-transform:uppercase; color:var(--cyan-400);
  background:rgba(79,193,214,.1); border:1px solid rgba(79,193,214,.25);
  padding:6px 12px; border-radius:999px; margin-bottom:20px;
}
.hero h1{font-size:clamp(32px, 4.2vw, 52px); max-width:560px;}
.hero p.lead{color:rgba(255,255,255,.72); font-size:18px; max-width:520px;}
.hero-actions{display:flex; gap:14px; margin-top:30px; flex-wrap:wrap;}
.hero-stats{display:flex; gap:28px; margin-top:44px; flex-wrap:wrap;}
.hero-stat b{display:block; font-family:var(--font-display); font-size:26px; color:var(--white);}
.hero-stat span{font-size:13px; color:rgba(255,255,255,.55);}

/* Schematic (signature element) */
.schematic{position:relative; width:100%; height:100%; min-height:380px;}
.schematic svg{width:100%; height:auto;}
.flow-line{stroke-dasharray:6 8; animation:flow 2.2s linear infinite;}
@keyframes flow{to{stroke-dashoffset:-56;}}
.node-tag{font-family:var(--font-mono); font-size:12px;}
.node-tag .val{fill:var(--cyan-400); font-weight:600;}
.pulse{animation:pulse 2.4s ease-in-out infinite;}
@keyframes pulse{0%,100%{opacity:1;} 50%{opacity:.45;}}
@media (prefers-reduced-motion: reduce){
  .flow-line, .pulse{animation:none;}
}
@media (max-width: 900px){
  .hero-grid{grid-template-columns:1fr;}
}

/* Section basics */
.section{padding:80px 0;}
.section-tight{padding:56px 0;}
.section-head{max-width:640px; margin:0 0 44px;}
.section-head .eyebrow{color:var(--teal-700); background:rgba(14,124,134,.08); border-color:rgba(14,124,134,.2);}
.section-alt{background:var(--paper-100);}
.section-dark{background:var(--ink-900); color:rgba(255,255,255,.85);}
.section-dark h2, .section-dark h3{color:var(--white);}

/* Feature grid */
.grid{display:grid; gap:24px;}
.grid-3{grid-template-columns:repeat(3, 1fr);}
.grid-4{grid-template-columns:repeat(4, 1fr);}
.grid-2{grid-template-columns:repeat(2, 1fr);}
@media (max-width:900px){.grid-3,.grid-4,.grid-2{grid-template-columns:1fr 1fr;}}
@media (max-width:640px){.grid-3,.grid-4,.grid-2{grid-template-columns:1fr;}}

.card{
  background:var(--white); border-radius:var(--radius-lg); padding:28px;
  box-shadow:var(--shadow-card); border:1px solid rgba(11,31,42,.05);
}
.card .icon-badge{
  width:46px; height:46px; border-radius:12px; background:rgba(14,124,134,.09);
  display:flex; align-items:center; justify-content:center; margin-bottom:16px; color:var(--teal-700);
}
.card h3{font-size:18px; margin-bottom:8px;}
.card p{font-size:14.5px; color:var(--slate-500); margin:0;}

/* Segment tabs (residential/apartment/commercial) */
.segment-tabs{display:flex; gap:10px; flex-wrap:wrap; margin-bottom:32px;}
.segment-tab{
  padding:10px 18px; border-radius:999px; border:1px solid rgba(11,31,42,.12);
  font-weight:600; font-size:14px; color:var(--slate-700); cursor:pointer; background:var(--white);
}
.segment-tab.active{background:var(--ink-900); color:var(--white); border-color:var(--ink-900);}

/* Process steps */
.steps{display:grid; grid-template-columns:repeat(4,1fr); gap:20px;}
@media (max-width:900px){.steps{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.steps{grid-template-columns:1fr;}}
.step{position:relative; padding-top:14px;}
.step .num{font-family:var(--font-mono); color:var(--cyan-400); font-size:13px; background:var(--ink-900); display:inline-block; padding:4px 10px; border-radius:6px; margin-bottom:14px;}
.step h4{font-size:16.5px; margin-bottom:6px; color:var(--ink-900);}
.step p{font-size:14px; color:var(--slate-500);}

/* CTA band */
.cta-band{
  background:linear-gradient(120deg, var(--teal-700), var(--ink-900));
  border-radius:var(--radius-lg); padding:52px; color:var(--white);
  display:flex; align-items:center; justify-content:space-between; gap:32px; flex-wrap:wrap;
}
.cta-band h3{color:var(--white); font-size:26px; margin-bottom:6px;}
.cta-band p{color:rgba(255,255,255,.75); margin:0;}

/* Forms */
.form-card{
  background:var(--white); border-radius:var(--radius-lg); padding:36px;
  box-shadow:var(--shadow-card); border:1px solid rgba(11,31,42,.05);
}
.form-row{display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-bottom:18px;}
@media (max-width:640px){.form-row{grid-template-columns:1fr;}}
.field label{display:block; font-size:13.5px; font-weight:600; color:var(--ink-900); margin-bottom:7px;}
.field input, .field select, .field textarea{
  width:100%; padding:12px 14px; border-radius:9px; border:1px solid rgba(11,31,42,.15);
  font-family:var(--font-body); font-size:14.5px; color:var(--slate-700); background:var(--paper-50);
  transition:border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline:none; border-color:var(--teal-700); background:var(--white);
}
.field textarea{resize:vertical; min-height:110px;}
.field-full{grid-column:1 / -1;}

.alert{padding:14px 18px; border-radius:10px; font-size:14px; margin-bottom:22px; font-weight:500;}
.alert-success{background:rgba(47,158,99,.1); color:#227a4c; border:1px solid rgba(47,158,99,.25);}
.alert-error{background:rgba(224,80,80,.1); color:#b23b3b; border:1px solid rgba(224,80,80,.25);}

/* Badges (shared with admin) */
.badge{display:inline-block; padding:4px 11px; border-radius:999px; font-size:12px; font-weight:600; font-family:var(--font-mono);}
.badge-blue{background:#E7F0FB; color:#2A63A8;}
.badge-amber{background:#FCF0DD; color:#9C6B12;}
.badge-teal{background:#DEF3F1; color:#0E7C86;}
.badge-green{background:#E1F6E9; color:#227a4c;}
.badge-grey{background:#EEF1F2; color:#5D7178;}

/* Footer */
.site-footer{background:var(--ink-900); color:rgba(255,255,255,.65); padding:60px 0 26px;}
.footer-grid{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:36px; margin-bottom:44px;}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;}}
.footer-grid h5{color:var(--white); font-family:var(--font-display); font-size:14px; margin-bottom:14px; letter-spacing:.03em;}
.footer-grid ul{list-style:none; margin:0; padding:0;}
.footer-grid li{margin-bottom:10px; font-size:14px;}
.footer-grid a:hover{color:var(--cyan-400);}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08); padding-top:22px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:13px;}

/* Utility */
.text-center{text-align:center;}
.mt-0{margin-top:0;}
.small{font-size:13.5px; color:var(--slate-500);}