/* ==========================================================
   SHIKHAR POWER — Energy Vertical Design System
   Typography: IBM Plex Sans (headings) / Source Sans 3 (body)
   ========================================================== */

:root {
  --ep-dark:      #0D1B14;
  --ep-dark-2:    #122218;
  --ep-dark-3:    #0A1510;
  --ep-green:     #3EA87A;
  --ep-green-dim: rgba(62, 168, 122, 0.14);
  --ep-primary:   #1F5A37;
  --ep-brass:     #C9A14A;
  --ep-bg:        #F8F7F3;
  --ep-bg-alt:    #EFECE4;
  --ep-ink:       #1B1B1B;
  --ep-ink-muted: #5C5C5C;
  --ep-line-dark: rgba(255, 255, 255, 0.09);
  --ep-line-lt:   rgba(27, 27, 27, 0.13);
  --ep-max:       1200px;
}

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

body {
  margin: 0;
  background: var(--ep-dark);
  color: var(--ep-ink);
  font-family: 'Source Sans 3', 'Source Sans Pro', ui-sans-serif, system-ui, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a   { color: inherit; text-decoration: none; }
h1, h2, h3, p, dl, ol, ul { margin-top: 0; }

h1, h2, h3,
.ep-logo-name,
.ep-hero-title,
.ep-h2,
.ep-eyebrow,
.ep-eyebrow-green,
.ep-eyebrow-light,
.ep-metric strong,
.ep-callout-stat strong,
.ep-flow-text strong,
.ep-chain-node strong,
.ep-impact-card h3,
.ep-facility-card dt,
.ep-biomass-facts dt,
.ep-nav a,
.ep-footer-name,
.ep-footer-col h4 {
  font-family: 'IBM Plex Sans', ui-sans-serif, sans-serif;
}

/* ==========================================================
   SHARED UTILITIES
   ========================================================== */
.ep-wrap {
  width: min(var(--ep-max), calc(100% - 48px));
  margin: 0 auto;
}

.ep-section { padding: 96px 0; }

.ep-eyebrow,
.ep-eyebrow-green,
.ep-eyebrow-light {
  display: block;
  margin-bottom: 16px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-family: 'IBM Plex Sans', sans-serif;
}

.ep-eyebrow       { color: rgba(255, 255, 255, 0.38); }
.ep-eyebrow-green { color: var(--ep-green); }
.ep-eyebrow-light { color: rgba(255, 255, 255, 0.32); }

.ep-h2 {
  font-size: clamp(28px, 3.6vw, 50px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ep-ink);
  margin-bottom: 0;
}

.ep-h2-light { color: #fff; }

/* ==========================================================
   HEADER
   ========================================================== */
.ep-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  padding: 0 clamp(20px, 4vw, 60px);
  border-bottom: 1px solid transparent;
  transition: background 240ms ease, border-color 240ms ease;
}

.ep-header.scrolled {
  background: var(--ep-dark);
  border-bottom-color: var(--ep-line-dark);
}

.ep-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ep-logo-mark { width: 32px; height: 32px; object-fit: contain; }

.ep-logo-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  line-height: 1;
}

.ep-logo-name {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
}

.ep-logo-sub {
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.32);
  font-family: 'Source Sans 3', sans-serif;
}

.ep-nav {
  display: flex;
  align-items: center;
}

.ep-nav a {
  display: inline-flex;
  align-items: center;
  height: 60px;
  padding: 0 16px;
  color: rgba(255, 255, 255, 0.52);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 2px solid transparent;
  transition: color 150ms, border-color 150ms;
}

.ep-nav a:hover           { color: #fff; border-bottom-color: var(--ep-green); }
.ep-nav .ep-nav-group     { color: rgba(255, 255, 255, 0.3); font-size: 11px; }
.ep-nav .ep-nav-group:hover { color: rgba(255, 255, 255, 0.65); border-bottom-color: transparent; }

/* ==========================================================
   HERO
   ========================================================== */
.ep-hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.ep-hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('assets/energy-hero.jpg');
  background-size: cover;
  background-position: center 40%;
  background-color: var(--ep-dark-3);
  /* Subtle structural gradient even without a photo */
  background-image:
    url('assets/energy-hero.jpg'),
    radial-gradient(ellipse at 60% 30%, rgba(31, 90, 55, 0.18) 0%, transparent 55%),
    linear-gradient(160deg, #081210 0%, #0F2018 50%, #070E0B 100%);
}

.ep-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(8, 18, 12, 0.38) 0%,
    rgba(8, 18, 12, 0.60) 55%,
    rgba(8, 18, 12, 0.92) 100%
  );
}

.ep-hero-content {
  position: relative;
  z-index: 5;
  padding-bottom: 72px;
  padding-top: 120px;
}

.ep-hero-title {
  margin: 16px 0 24px;
  color: #fff;
  font-size: clamp(34px, 4.8vw, 68px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.01em;
  max-width: 820px;
}

.ep-hero-sub {
  max-width: 580px;
  color: rgba(255, 255, 255, 0.52);
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.72;
  margin-bottom: 56px;
}

/* Metrics — 4 cells with ruled vertical separators */
.ep-metrics {
  display: flex;
  border: 1px solid rgba(255, 255, 255, 0.12);
  width: max-content;
  max-width: 100%;
}

.ep-metric {
  padding: 20px 32px;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
  min-width: 140px;
}

.ep-metric:last-child { border-right: none; }

.ep-metric strong {
  display: block;
  font-size: clamp(20px, 2vw, 28px);
  font-weight: 700;
  color: #fff;
  line-height: 1.1;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.ep-metric span {
  display: block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  font-family: 'Source Sans 3', sans-serif;
}

/* ==========================================================
   ABOUT
   ========================================================== */
.ep-about {
  background: var(--ep-bg);
  border-top: 1px solid var(--ep-line-lt);
}

.ep-about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(48px, 7vw, 110px);
  align-items: start;
}

.ep-about-left { display: grid; gap: 20px; }

.ep-about-lead {
  color: var(--ep-ink);
  font-size: 18px;
  line-height: 1.72;
  margin: 0;
}

.ep-about-body {
  color: var(--ep-ink-muted);
  font-size: 16px;
  line-height: 1.7;
  margin: 0;
}

/* Callout panel — flat ruled box */
.ep-callout {
  border: 1px solid var(--ep-line-lt);
  background: var(--ep-bg);
}

.ep-callout-stat {
  padding: 28px 28px 24px;
  border-bottom: 1px solid var(--ep-line-lt);
}

.ep-callout-stat strong {
  display: block;
  font-size: 48px;
  font-weight: 700;
  color: var(--ep-primary);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.ep-callout-stat span {
  color: var(--ep-ink-muted);
  font-size: 13px;
  line-height: 1.5;
}

.ep-callout-divider { display: none; }

.ep-callout-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 28px;
  border-bottom: 1px solid var(--ep-line-lt);
  color: var(--ep-ink-muted);
  font-size: 14px;
}

.ep-callout-item:last-child { border-bottom: none; }

.ep-callout-item svg {
  flex-shrink: 0;
  color: var(--ep-green);
}

/* ==========================================================
   IMPACT
   ========================================================== */
.ep-impact {
  background: var(--ep-dark);
  border-top: 1px solid var(--ep-line-dark);
}

.ep-impact .ep-h2-light { margin-bottom: 48px; }

.ep-impact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--ep-line-dark);
  border-right: none;
}

.ep-impact-card {
  padding: 32px 28px 36px;
  border-right: 1px solid var(--ep-line-dark);
  background: var(--ep-dark);
  transition: background 180ms;
}

.ep-impact-card:hover { background: var(--ep-dark-2); }

.ep-impact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(62, 168, 122, 0.2);
  color: var(--ep-green);
  margin-bottom: 22px;
}

.ep-impact-card h3 {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.2;
}

.ep-impact-card p {
  color: rgba(255, 255, 255, 0.42);
  font-size: 14px;
  line-height: 1.65;
  margin: 0;
}

/* ==========================================================
   FACILITY OVERVIEW
   ========================================================== */
.ep-facility {
  background: var(--ep-bg);
  border-top: 1px solid var(--ep-line-lt);
}

.ep-facility .ep-h2 { margin-bottom: 48px; }

.ep-facility-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid var(--ep-line-lt);
  border-right: none;
}

.ep-facility-card {
  padding: 28px 24px 32px;
  border-right: 1px solid var(--ep-line-lt);
  display: grid;
  align-content: start;
  gap: 10px;
  transition: background 180ms;
}

.ep-facility-card:hover { background: var(--ep-bg-alt); }

.ep-facility-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(31, 90, 55, 0.2);
  color: var(--ep-primary);
  margin-bottom: 6px;
}

.ep-facility-card dt {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ep-ink-muted);
}

.ep-facility-card dd {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ep-ink);
  line-height: 1.35;
  font-family: 'IBM Plex Sans', sans-serif;
}

/* ==========================================================
   SUSTAINABILITY FLOW
   ========================================================== */
.ep-sustain {
  background: var(--ep-primary);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.ep-sustain-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(48px, 7vw, 110px);
  align-items: center;
}

.ep-sustain-left { display: grid; gap: 20px; }

.ep-sustain-desc {
  color: rgba(255, 255, 255, 0.55);
  font-size: 17px;
  line-height: 1.72;
  margin: 0;
  max-width: 440px;
}

/* Stepped vertical flow list */
.ep-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  counter-reset: flow;
}

.ep-flow-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  counter-increment: flow;
  transition: background 160ms;
}

.ep-flow-item:hover  { background: rgba(255, 255, 255, 0.04); }
.ep-flow-last        { border-bottom: none; }

/* Step number from counter — top-right badge */
.ep-flow-item::before {
  content: "0" counter(flow);
  position: absolute;
  top: 18px; right: 20px;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.22);
}

.ep-flow-node {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.65);
  flex-shrink: 0;
}

.ep-flow-text { display: grid; gap: 4px; }

.ep-flow-text strong {
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.ep-flow-text span {
  color: rgba(255, 255, 255, 0.42);
  font-size: 12px;
  font-family: 'Source Sans 3', sans-serif;
}

/* ==========================================================
   WHY BIOMASS
   ========================================================== */
.ep-biomass {
  background: var(--ep-bg);
  border-top: 1px solid var(--ep-line-lt);
}

.ep-biomass-inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: clamp(48px, 7vw, 110px);
  align-items: start;
}

.ep-biomass-left { display: grid; gap: 14px; padding-top: 6px; }

.ep-biomass-lead {
  margin: 0 0 32px;
  color: var(--ep-ink);
  font-size: 18px;
  line-height: 1.7;
}

/* Ruled fact list */
.ep-biomass-facts {
  border: 1px solid var(--ep-line-lt);
  display: grid;
}

.ep-biomass-fact {
  padding: 20px 24px;
  border-bottom: 1px solid var(--ep-line-lt);
  display: grid;
  gap: 6px;
}

.ep-biomass-fact:last-child { border-bottom: none; }

.ep-biomass-facts dt {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ep-primary);
}

.ep-biomass-facts dd {
  margin: 0;
  font-size: 14px;
  color: var(--ep-ink-muted);
  line-height: 1.6;
}

/* ==========================================================
   VISION
   ========================================================== */
.ep-vision {
  background: var(--ep-dark-3);
  border-top: 1px solid var(--ep-line-dark);
}

.ep-vision-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  display: grid;
  gap: 24px;
  justify-items: center;
}

.ep-vision-text {
  color: rgba(255, 255, 255, 0.5);
  font-size: 18px;
  line-height: 1.8;
  margin: 0;
  max-width: 620px;
}

.ep-vision-rule {
  width: 48px;
  height: 1px;
  background: rgba(255, 255, 255, 0.15);
}

.ep-vision-statement {
  color: rgba(255, 255, 255, 0.32);
  font-size: 14px;
  line-height: 1.7;
  font-style: italic;
  margin: 0;
  max-width: 540px;
  font-family: 'IBM Plex Sans', sans-serif;
}

/* ==========================================================
   FROM AGRICULTURE TO ENERGY
   ========================================================== */
.ep-agri-energy {
  background: var(--ep-bg);
  border-top: 1px solid var(--ep-line-lt);
}

.ep-agri-energy .ep-h2 { margin-bottom: 16px; }

.ep-agri-intro {
  max-width: 560px;
  color: var(--ep-ink-muted);
  font-size: 17px;
  line-height: 1.7;
  margin-bottom: 56px;
}

/* Horizontal 5-node chain */
.ep-chain {
  display: flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--ep-line-lt);
  border-right: none;
  overflow-x: auto;
}

.ep-chain-node {
  flex: 1;
  min-width: 150px;
  padding: 28px 20px 32px;
  border-right: 1px solid var(--ep-line-lt);
  display: grid;
  align-content: start;
  gap: 10px;
  transition: background 180ms;
}

.ep-chain-node:hover { background: var(--ep-bg-alt); }

.ep-chain-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(31, 90, 55, 0.18);
  color: var(--ep-primary);
  margin-bottom: 4px;
}

.ep-chain-node strong {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--ep-ink);
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.ep-chain-node span {
  display: block;
  font-size: 11px;
  color: var(--ep-ink-muted);
  line-height: 1.4;
}

.ep-chain-arrow {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  color: rgba(27, 27, 27, 0.22);
}

/* ==========================================================
   FOOTER
   ========================================================== */
.ep-footer {
  background: var(--ep-dark);
  border-top: 1px solid var(--ep-line-dark);
  padding: 56px 0 24px;
}

.ep-footer-top {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(48px, 6vw, 100px);
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--ep-line-dark);
}

.ep-footer-brand { display: grid; gap: 20px; align-content: start; }

.ep-footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
}

.ep-footer-logo img { opacity: 0.7; }

.ep-footer-name {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  line-height: 1;
}

.ep-footer-sub-brand {
  display: block;
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.28);
  margin-top: 4px;
  font-family: 'Source Sans 3', sans-serif;
}

.ep-footer-statement {
  color: rgba(255, 255, 255, 0.32);
  font-size: 13px;
  line-height: 1.75;
  font-style: italic;
  margin: 0;
  max-width: 340px;
  font-family: 'IBM Plex Sans', sans-serif;
}

.ep-footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.ep-footer-col { display: grid; align-content: start; gap: 12px; }

.ep-footer-col h4 {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.28);
  margin: 0;
}

.ep-footer-col a {
  display: block;
  color: rgba(255, 255, 255, 0.48);
  font-size: 13px;
  font-weight: 400;
  transition: color 150ms;
}

.ep-footer-col a:hover { color: rgba(255, 255, 255, 0.78); }

.ep-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.ep-footer-bottom span {
  color: rgba(255, 255, 255, 0.2);
  font-size: 11px;
  letter-spacing: 0.06em;
  font-family: 'IBM Plex Sans', sans-serif;
}

.ep-footer-bottom a {
  color: rgba(255, 255, 255, 0.28);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  transition: color 150ms;
}

.ep-footer-bottom a:hover { color: rgba(255, 255, 255, 0.65); }

/* ==========================================================
   RESPONSIVE — 1024px
   ========================================================== */
@media (max-width: 1024px) {
  .ep-facility-grid { grid-template-columns: repeat(3, 1fr); }
  .ep-facility-card:nth-child(3) { border-right: none; }
  .ep-facility-card:nth-child(n+4) { border-top: 1px solid var(--ep-line-lt); }
}

/* ==========================================================
   RESPONSIVE — 860px (tablet)
   ========================================================== */
@media (max-width: 860px) {
  .ep-nav a { padding: 0 12px; font-size: 11px; }

  .ep-about-grid,
  .ep-sustain-grid,
  .ep-biomass-inner { grid-template-columns: 1fr; }

  .ep-impact-grid { grid-template-columns: 1fr 1fr; border-right: none; }
  .ep-impact-card { border-right: 1px solid var(--ep-line-dark); }
  .ep-impact-card:nth-child(2n) { border-right: none; }
  .ep-impact-card:nth-child(n+3) { border-top: 1px solid var(--ep-line-dark); }

  .ep-facility-grid { grid-template-columns: 1fr 1fr; }
  .ep-facility-card { border-right: 1px solid var(--ep-line-lt); }
  .ep-facility-card:nth-child(2n) { border-right: none; }
  .ep-facility-card:nth-child(n+3) { border-top: 1px solid var(--ep-line-lt); }

  .ep-chain { flex-direction: column; border-right: 1px solid var(--ep-line-lt); }
  .ep-chain-node { width: 100%; border-right: none; border-bottom: 1px solid var(--ep-line-lt); }
  .ep-chain-arrow { transform: rotate(90deg); margin: -8px 0; z-index: 1; }

  .ep-footer-top    { grid-template-columns: 1fr; }
  .ep-footer-links  { grid-template-columns: 1fr 1fr; }
}

/* ==========================================================
   RESPONSIVE — 600px (mobile)
   ========================================================== */
@media (max-width: 600px) {
  .ep-header { padding: 0 20px; }
  .ep-section { padding: 64px 0; }

  .ep-metrics { flex-direction: column; width: 100%; }
  .ep-metric  { border-right: none; border-bottom: 1px solid rgba(255, 255, 255, 0.1); padding: 16px 20px; }
  .ep-metric:last-child { border-bottom: none; }

  .ep-impact-grid { grid-template-columns: 1fr; border-right: 1px solid var(--ep-line-dark); }
  .ep-impact-card { border-right: none; border-bottom: 1px solid var(--ep-line-dark); }
  .ep-impact-card:last-child { border-bottom: none; }

  .ep-facility-grid { grid-template-columns: 1fr; }
  .ep-facility-card { border-right: 1px solid var(--ep-line-lt); border-bottom: 1px solid var(--ep-line-lt); }
  .ep-facility-card:last-child { border-bottom: none; }

  .ep-footer-links { grid-template-columns: 1fr; }

  .ep-nav a:not(.ep-nav-group) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; }
}