/* ==========================================================================
   TerraVolts Energy Private Limited — Core Stylesheet
   Design system: "Single-Line Diagram" — grounded in the schematic language
   of power engineering (generation → charging → connectivity).
   ========================================================================== */

:root{
  /* -- Color tokens -- */
  --forest-canopy:#0F3D2E;   /* deep forest green — primary dark surface   */
  --forest-canopy-2:#0B2F23; /* darker variant for depth / gradients        */
  --signal-green:#2F9E66;    /* growth / solar-active accent                */
  --sunfield-amber:#E8A33D;  /* sun / warmth accent                         */
  --voltage-blue:#3C7FB8;    /* EV / electric accent                        */
  --paper:#F7F5EF;           /* light surface                               */
  --paper-dim:#EFEBDF;       /* light surface, secondary                   */
  --ink:#16201C;             /* primary text on light                      */
  --ink-soft:#4B564E;        /* secondary text on light                    */
  --line:#D8D2C2;            /* hairline borders on light                  */
  --line-dark:rgba(247,245,239,0.14);

  /* -- Type -- */
  --font-display:'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body:'Inter', 'Segoe UI', sans-serif;
  --font-mono:'IBM Plex Mono', 'Courier New', monospace;

  /* -- Rhythm -- */
  --gap-xs:.5rem;
  --gap-sm:1rem;
  --gap-md:2rem;
  --gap-lg:4rem;
  --gap-xl:7rem;
  --radius:6px;
  --container:1180px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }

body{
  margin:0;
  font-family:var(--font-body);
  background:var(--paper);
  color:var(--ink);
  line-height:1.6;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  line-height:1.12;
  margin:0 0 var(--gap-sm);
  letter-spacing:-0.01em;
  font-weight:600;
}

p{ margin:0 0 1rem; color:var(--ink-soft); }
a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }
ul{ margin:0; padding:0; list-style:none; }

.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 1.5rem;
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--signal-green);
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  margin-bottom:.9rem;
}
.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:var(--signal-green);
  display:inline-block;
}

/* ---------------- Buttons ---------------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:.85rem;
  letter-spacing:.03em;
  padding:.9rem 1.6rem;
  border-radius:var(--radius);
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .25s ease, background .25s ease, border-color .25s ease, color .25s ease;
  white-space:nowrap;
}
.btn-primary{
  background:var(--signal-green);
  color:var(--forest-canopy-2);
  font-weight:600;
}
.btn-primary:hover{ transform:translateY(-2px); background:#3CB374; }
.btn-outline{
  background:transparent;
  border-color:var(--line-dark);
  color:var(--paper);
}
.btn-outline:hover{ border-color:var(--signal-green); color:var(--signal-green); }
.btn-outline.on-light{ border-color:var(--line); color:var(--ink); }
.btn-outline.on-light:hover{ border-color:var(--signal-green); color:var(--signal-green); }

/* ---------------- Header / Nav ---------------- */
.site-header{
  position:fixed;
  top:0; left:0; right:0;
  z-index:100;
  padding:1.1rem 0;
  background:rgba(15,61,46,0.0);
  transition:background .35s ease, padding .35s ease, box-shadow .35s ease;
}
.site-header.is-scrolled{
  background:rgba(11,47,35,0.92);
  backdrop-filter:blur(10px);
  padding:.75rem 0;
  box-shadow:0 8px 30px rgba(0,0,0,.25);
}
.site-header .container{
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.brand{
  display:flex;
  align-items:center;
  gap:.65rem;
  color:var(--paper);
  font-family:var(--font-display);
  font-weight:600;
  font-size:1.05rem;
  letter-spacing:.01em;
}
.brand svg{ width:34px; height:34px; }
.brand .brand-sub{
  display:block;
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.14em;
  color:var(--signal-green);
  font-weight:400;
  margin-top:1px;
}

.nav-links{
  display:flex;
  align-items:center;
  gap:2.1rem;
}
.nav-links a{
  color:var(--paper);
  font-size:.92rem;
  opacity:.85;
  position:relative;
  padding:.2rem 0;
  transition:opacity .2s ease;
}
.nav-links a:hover{ opacity:1; }
.nav-links a.active{ opacity:1; color:var(--signal-green); }
.nav-links a::after{
  content:"";
  position:absolute;
  left:0; bottom:-4px;
  width:0; height:1px;
  background:var(--signal-green);
  transition:width .25s ease;
}
.nav-links a:hover::after,
.nav-links a.active::after{ width:100%; }

.nav-cta{ display:flex; align-items:center; gap:1.2rem; }
.nav-phone{
  display:flex; align-items:center; gap:.5rem;
  color:var(--paper); font-family:var(--font-mono); font-size:.85rem;
}
.nav-phone svg{ width:16px; height:16px; stroke:var(--sunfield-amber); }

.nav-toggle{
  display:none;
  background:none; border:none; cursor:pointer;
  width:32px; height:24px; position:relative;
}
.nav-toggle span{
  position:absolute; left:0; width:100%; height:2px; background:var(--paper);
  transition:all .3s ease;
}
.nav-toggle span:nth-child(1){ top:0; }
.nav-toggle span:nth-child(2){ top:11px; }
.nav-toggle span:nth-child(3){ top:22px; }

/* ---------------- Hero ---------------- */
.hero{
  position:relative;
  background:linear-gradient(180deg,var(--forest-canopy) 0%, var(--forest-canopy-2) 100%);
  color:var(--paper);
  padding:9.5rem 0 6rem;
  overflow:hidden;
}
.hero-grid{
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-dark) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 20%, black 40%, transparent 90%);
  opacity:.5;
}
.hero .container{ position:relative; z-index:2; }
.hero-inner{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:var(--gap-lg);
  align-items:center;
}
.hero h1{
  font-size:clamp(2.4rem, 4.6vw, 3.8rem);
  margin-bottom:1.2rem;
}
.hero h1 .accent{ color:var(--signal-green); }
.hero-lede{
  font-size:1.08rem;
  max-width:46ch;
  color:rgba(247,245,239,.75);
}
.hero-actions{
  display:flex; align-items:center; gap:1.4rem;
  margin-top:2.2rem; flex-wrap:wrap;
}
.hero-call{
  font-family:var(--font-mono); font-size:.85rem; color:rgba(247,245,239,.7);
}
.hero-call strong{ color:var(--paper); display:block; font-size:1.05rem; letter-spacing:.02em; }

/* Signature element: single-line power-flow schematic */
.flow-diagram{ width:100%; height:auto; }
.flow-diagram .flow-path{
  fill:none;
  stroke:var(--signal-green);
  stroke-width:1.6;
  stroke-dasharray:6 7;
  animation:flowdash 3.2s linear infinite;
}
.flow-diagram .flow-node circle{ fill:var(--forest-canopy-2); stroke:var(--signal-green); stroke-width:1.6; }
.flow-diagram .flow-node.is-amber circle{ stroke:var(--sunfield-amber); }
.flow-diagram .flow-node.is-blue circle{ stroke:var(--voltage-blue); }
.flow-diagram .flow-label{
  font-family:var(--font-mono);
  font-size:9px;
  fill:rgba(247,245,239,.65);
  letter-spacing:.05em;
}
.flow-diagram .flow-value{
  font-family:var(--font-mono);
  font-size:8px;
  fill:var(--signal-green);
}
@keyframes flowdash{ to{ stroke-dashoffset:-130; } }

/* Divider version reused between sections */
.section-divider{ display:block; width:100%; height:auto; margin:0 0 -1px; }
.section-divider .flow-path{
  fill:none; stroke:var(--line); stroke-width:1; stroke-dasharray:4 6;
  animation:flowdash 5s linear infinite;
}
.section-divider .flow-node circle{ fill:var(--paper); stroke:var(--signal-green); stroke-width:1.4; }

/* ---------------- Stat strip ---------------- */
.stat-strip{
  background:var(--forest-canopy-2);
  border-top:1px solid var(--line-dark);
  padding:2.2rem 0;
}
.stat-strip .container{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:var(--gap-md);
}
.stat{ color:var(--paper); }
.stat .stat-num{
  font-family:var(--font-mono);
  font-size:1.9rem;
  color:var(--signal-green);
  display:block;
}
.stat .stat-label{
  font-size:.78rem; letter-spacing:.04em; color:rgba(247,245,239,.6);
}

/* ---------------- Sections (generic) ---------------- */
section{ padding:var(--gap-xl) 0; }
.section-head{
  max-width:640px;
  margin-bottom:var(--gap-lg);
}
.section-head h2{ font-size:clamp(1.8rem,3vw,2.5rem); }
.on-dark{ background:var(--forest-canopy); color:var(--paper); }
.on-dark p{ color:rgba(247,245,239,.72); }
.on-dark .section-head h2{ color:var(--paper); }

/* ---------------- Service Cards ---------------- */
.service-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1.6rem;
}
.service-card{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:2rem 1.8rem;
  position:relative;
  transition:transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.service-card:hover{
  transform:translateY(-6px);
  box-shadow:0 24px 50px -20px rgba(15,61,46,.25);
  border-color:var(--signal-green);
}
.service-card .tag{
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--voltage-blue);
}
.service-card.solar .tag{ color:var(--sunfield-amber); }
.service-card.telecom .tag{ color:var(--voltage-blue); }
.service-card.ev .tag{ color:var(--signal-green); }
.service-card h3{ font-size:1.35rem; margin:.6rem 0 .8rem; }
.service-card ul{ margin-top:1rem; }
.service-card ul li{
  font-size:.92rem; color:var(--ink-soft);
  padding:.4rem 0; border-top:1px solid var(--line);
  display:flex; align-items:center; gap:.6rem;
}
.service-card ul li:first-child{ border-top:none; }
.service-card ul li::before{
  content:"";
  width:6px; height:6px; border-radius:50%;
  background:var(--signal-green); flex-shrink:0;
}
.service-card .icon-mark{ width:44px; height:44px; margin-bottom:.4rem; }

/* ---------------- Why-choose-us ---------------- */
.reason-grid{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:1.2rem;
}
.reason{
  text-align:left;
  padding:1.4rem 1rem 1.4rem 0;
  border-top:1px solid var(--line-dark);
}
.reason .reason-num{
  font-family:var(--font-mono);
  font-size:.75rem;
  color:var(--signal-green);
}
.reason h4{ font-size:1rem; margin:.6rem 0 .4rem; color:var(--paper); }
.reason p{ font-size:.85rem; margin:0; }

/* ---------------- Vision / Mission ---------------- */
.vm-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:1.6rem;
}
.vm-card{
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:2.4rem;
  background:var(--paper);
}
.vm-card.mission{ background:var(--paper-dim); }
.vm-card .eyebrow{ margin-bottom:1.2rem; }
.vm-card p{ font-size:1.05rem; color:var(--ink-soft); }

/* ---------------- CTA band ---------------- */
.cta-band{
  background:var(--forest-canopy);
  color:var(--paper);
  padding:var(--gap-xl) 0;
  position:relative;
  overflow:hidden;
}
.cta-band .container{
  position:relative; z-index:2;
  display:flex; align-items:center; justify-content:space-between; gap:2rem; flex-wrap:wrap;
}
.cta-band h2{ font-size:clamp(1.9rem,3.4vw,2.6rem); max-width:20ch; }
.cta-contacts{ display:flex; flex-direction:column; gap:.8rem; }
.cta-contacts a{
  display:flex; align-items:center; gap:.7rem;
  font-family:var(--font-mono); font-size:1rem;
}
.cta-contacts svg{ width:18px; height:18px; stroke:var(--signal-green); }

/* ---------------- Footer ---------------- */
.site-footer{
  background:var(--forest-canopy-2);
  color:rgba(247,245,239,.7);
  padding:3.6rem 0 1.6rem;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:2rem;
  padding-bottom:2.4rem;
  border-bottom:1px solid var(--line-dark);
}
.footer-brand .brand{ color:var(--paper); margin-bottom:.8rem; }
.footer-brand p{ font-size:.88rem; max-width:32ch; }
.footer-col h5{
  font-family:var(--font-mono);
  font-size:.72rem; letter-spacing:.1em; text-transform:uppercase;
  color:var(--signal-green); margin-bottom:1rem;
}
.footer-col a{
  display:block; font-size:.9rem; padding:.35rem 0; opacity:.85;
  transition:opacity .2s ease, color .2s ease;
}
.footer-col a:hover{ opacity:1; color:var(--signal-green); }
.footer-bottom{
  display:flex; justify-content:space-between; align-items:center;
  padding-top:1.6rem; font-size:.8rem; flex-wrap:wrap; gap:1rem;
}
.social-icons{ display:flex; gap:.9rem; }
.social-icons a{
  width:34px; height:34px; border:1px solid var(--line-dark); border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  transition:border-color .2s ease, transform .2s ease;
}
.social-icons a:hover{ border-color:var(--signal-green); transform:translateY(-2px); }
.social-icons svg{ width:15px; height:15px; }

/* ---------------- Inner page hero (About/Services/Contact) ---------------- */
.page-hero{
  background:linear-gradient(180deg,var(--forest-canopy) 0%, var(--forest-canopy-2) 100%);
  color:var(--paper);
  padding:8.5rem 0 4.5rem;
  position:relative;
  overflow:hidden;
}
.page-hero .container{ position:relative; z-index:2; }
.page-hero h1{ font-size:clamp(2rem,4vw,3rem); max-width:16ch; }
.page-hero p{ max-width:52ch; color:rgba(247,245,239,.72); font-size:1.05rem; }
.breadcrumb{
  font-family:var(--font-mono); font-size:.78rem; color:var(--signal-green);
  margin-bottom:1rem; letter-spacing:.05em;
}

/* ---------------- Timeline / process (About) ---------------- */
.process-line{ position:relative; padding-left:2.2rem; }
.process-line::before{
  content:""; position:absolute; left:5px; top:6px; bottom:6px; width:1px;
  background:repeating-linear-gradient(180deg,var(--line) 0 6px, transparent 6px 12px);
}
.process-step{ position:relative; padding-bottom:2.6rem; }
.process-step:last-child{ padding-bottom:0; }
.process-step::before{
  content:""; position:absolute; left:-2.2rem; top:4px;
  width:11px; height:11px; border-radius:50%;
  background:var(--paper); border:2px solid var(--signal-green);
}
.process-step h4{ font-size:1.1rem; margin-bottom:.3rem; }
.process-step .step-tag{
  font-family:var(--font-mono); font-size:.7rem; color:var(--voltage-blue); letter-spacing:.06em;
}

/* ---------------- Values grid (About) ---------------- */
.values-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:1.4rem; }
.value-card{ padding:1.8rem; border:1px solid var(--line); border-radius:var(--radius); }
.value-card h4{ font-size:1.05rem; }

/* ---------------- Contact page ---------------- */
.contact-grid{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:var(--gap-lg);
}
.contact-info-card{
  background:var(--forest-canopy);
  color:var(--paper);
  border-radius:var(--radius);
  padding:2.4rem;
}
.contact-info-card .info-row{
  display:flex; gap:1rem; padding:1.1rem 0; border-top:1px solid var(--line-dark);
}
.contact-info-card .info-row:first-of-type{ border-top:none; }
.contact-info-card .info-row svg{ width:20px; height:20px; stroke:var(--signal-green); flex-shrink:0; margin-top:2px; }
.contact-info-card .info-row h5{ font-family:var(--font-mono); font-size:.75rem; letter-spacing:.06em; color:rgba(247,245,239,.55); margin-bottom:.3rem; text-transform:uppercase; }
.contact-info-card .info-row p{ margin:0; color:var(--paper); font-size:.95rem; }

.form-card{
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:2.4rem;
}
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:1rem; }
.field{ margin-bottom:1.2rem; }
.field label{
  display:block; font-family:var(--font-mono); font-size:.72rem;
  letter-spacing:.06em; text-transform:uppercase; color:var(--ink-soft); margin-bottom:.5rem;
}
.field input, .field select, .field textarea{
  width:100%; padding:.85rem 1rem; border:1px solid var(--line); border-radius:var(--radius);
  font-family:var(--font-body); font-size:.95rem; background:var(--paper); color:var(--ink);
  transition:border-color .2s ease;
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline:none; border-color:var(--signal-green);
}
.field textarea{ resize:vertical; min-height:110px; }
.form-note{ font-size:.82rem; color:var(--ink-soft); margin-top:.6rem; }

.map-wrap{
  border-radius:var(--radius); overflow:hidden; border:1px solid var(--line); margin-top:var(--gap-md);
}
.map-wrap iframe{ width:100%; height:340px; border:0; display:block; }

/* ---------------- Scroll reveal base ---------------- */
[data-reveal]{ opacity:0; transform:translateY(24px); transition:opacity .7s ease, transform .7s ease; }
[data-reveal].is-visible{ opacity:1; transform:translateY(0); }

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--signal-green); outline-offset:2px;
}