/* ==========================================================================
   Solar Grid System (SES) — stylesheet
   ========================================================================== */

:root {
  --deep-green: #0E5A47;
  --deep-green-dark: #0A3F32;
  --green: #7CC242;
  --green-dark: #67A836;
  --charcoal: #2E2E2E;
  --light-gray: #EBECEF;
  --white: #FFFFFF;

  --text: var(--charcoal);
  --text-muted: #63696B;

  --font-display: 'Manrope', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --container-w: 1240px;
  --gutter: clamp(20px, 5vw, 64px);

  --header-h: 84px;
  --header-h-scrolled: 68px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.55;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; color: var(--charcoal); letter-spacing: -0.01em; }

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.text-accent { color: var(--green); }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--deep-green); color: var(--white);
  padding: 12px 20px; z-index: 999;
}
.skip-link:focus { left: 0; }

::selection { background: var(--green); color: var(--deep-green-dark); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1.5px solid transparent;
  transition: transform 0.25s var(--ease), background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
  white-space: nowrap;
}
.btn span { transition: transform 0.25s var(--ease); }
.btn:hover span { transform: translateX(3px); }

.btn-primary {
  background: var(--green);
  color: var(--deep-green-dark);
}
.btn-primary:hover { background: var(--green-dark); }

.btn-outline {
  border-color: rgba(255,255,255,0.55);
  color: var(--white);
}
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.08); }

.btn-outline-dark {
  border-color: var(--deep-green);
  color: var(--deep-green);
}
.btn-outline-dark:hover { background: var(--deep-green); color: var(--white); }

.btn-sm { padding: 10px 18px; font-size: 0.85rem; }
.btn-lg { padding: 16px 34px; font-size: 1rem; }
.btn-block { width: 100%; }

.text-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-weight: 600; font-size: 0.9rem; color: var(--deep-green);
  border-bottom: 1.5px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.2s var(--ease), gap 0.2s var(--ease);
}
.text-link span { transition: transform 0.2s var(--ease); }
.text-link:hover { border-color: var(--green); }
.text-link:hover span { transform: translateX(3px); }
.text-link-lg { font-size: 1.05rem; }

/* ---------- Section heads ---------- */
.eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-dark);
  margin-bottom: 14px;
}
.eyebrow-light { color: var(--green); }

.section-head { max-width: 680px; margin-bottom: 56px; }
.section-head h2 { font-size: clamp(1.9rem, 3.2vw, 2.6rem); line-height: 1.15; }
.section-lead { margin-top: 18px; color: var(--text-muted); font-size: 1.05rem; }

section { position: relative; }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 500;
  height: var(--header-h);
  display: flex; align-items: center;
  background: transparent;
  transition: background-color 0.35s var(--ease), height 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  height: var(--header-h-scrolled);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  border-bottom-color: rgba(46,46,46,0.08);
  box-shadow: 0 8px 24px rgba(14,90,71,0.06);
}
.header-inner {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}

.logo { display: inline-flex; align-items: center; }
.logo-chip {
  display: inline-flex;
  align-items: center;
  border-radius: 6px;
  padding: 6px 10px;
  transition: background-color 0.35s var(--ease);
}
.logo-img {
  height: 40px;
  width: auto;
  display: block;
}
.footer-brand .logo-img { height: 44px; }

/* Logo art uses dark letterforms; back it with a light chip over dark/photo backgrounds */
.site-header:not(.is-scrolled) .logo-chip {
  background: rgba(255,255,255,0.94);
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
}
.footer-brand .logo-chip {
  background: rgba(255,255,255,0.94);
}

.main-nav ul { display: flex; align-items: center; gap: 36px; }
.nav-link {
  font-size: 0.92rem; font-weight: 600; color: var(--charcoal);
  position: relative; padding: 6px 0;
}
.site-header:not(.is-scrolled) .nav-link { color: var(--white); }
.nav-link::after {
  content: ''; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 2px; background: var(--green);
  transition: right 0.25s var(--ease);
}
.nav-link:hover::after, .nav-link.is-active::after { right: 0; }
.nav-link.is-active { color: var(--green-dark); }
.site-header:not(.is-scrolled) .nav-link.is-active { color: var(--green); }

.nav-mobile-actions { display: none; }

.header-actions { display: flex; align-items: center; gap: 22px; }

.lang-switch { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; font-weight: 700; }
.lang-btn { color: var(--text-muted); padding: 4px; letter-spacing: 0.02em; }
.site-header:not(.is-scrolled) .lang-btn { color: rgba(255,255,255,0.65); }
.lang-btn.is-active { color: var(--deep-green); }
.site-header:not(.is-scrolled) .lang-btn.is-active { color: var(--white); }
.lang-sep { color: var(--text-muted); opacity: 0.5; }
.site-header:not(.is-scrolled) .lang-sep { color: rgba(255,255,255,0.5); }

.hamburger {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; padding: 0;
}
.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--charcoal);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease), background-color 0.3s var(--ease);
}
.site-header:not(.is-scrolled) .hamburger span { background: var(--white); }
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.hamburger[aria-expanded="true"] span { background: var(--charcoal) !important; }

.nav-overlay {
  position: fixed; inset: 0; background: rgba(14,90,71,0.35);
  opacity: 0; visibility: hidden; transition: opacity 0.3s var(--ease), visibility 0.3s var(--ease);
  z-index: 400;
}
.nav-overlay.is-visible { opacity: 1; visibility: visible; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: var(--white);
  padding-top: var(--header-h);
}
.hero-visual { position: absolute; inset: 0; z-index: 0; overflow: hidden; }
.hero-photo { width: 100%; height: 100%; object-fit: cover; object-position: center 60%; }
.hero-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(6,38,30,0.65) 0%, rgba(8,42,33,0.35) 38%, rgba(6,38,30,0.85) 100%),
    linear-gradient(90deg, rgba(6,38,30,0.55) 0%, rgba(6,38,30,0.1) 55%);
}

.hero-inner { position: relative; z-index: 1; padding-bottom: 96px; padding-top: 64px; }
.hero-eyebrow {
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.24em;
  color: var(--green); margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(2.6rem, 6.4vw, 5.2rem);
  line-height: 1.03;
  font-weight: 800;
  max-width: 900px;
  color: var(--white);
}
.hero-sub {
  margin-top: 26px;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  font-weight: 500;
  color: rgba(255,255,255,0.92);
}
.hero-support {
  margin-top: 10px;
  font-size: 1rem;
  color: rgba(255,255,255,0.7);
  max-width: 480px;
}
.hero-ctas { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 42px; }

.hero-values {
  display: flex; flex-wrap: wrap; gap: 12px 36px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.18);
}
.hero-values li {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.88rem; font-weight: 600; color: rgba(255,255,255,0.85);
}
.value-icon { color: var(--green); font-size: 0.5rem; }

.hero-scroll-cue {
  position: absolute; left: 50%; bottom: 28px; transform: translateX(-50%);
  z-index: 1;
  width: 26px; height: 42px; border: 1.5px solid rgba(255,255,255,0.5); border-radius: 20px;
}
.hero-scroll-cue span {
  display: block; width: 4px; height: 8px; background: var(--green);
  border-radius: 3px; margin: 8px auto 0; animation: scrollCue 1.8s infinite;
}
@keyframes scrollCue {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(14px); opacity: 0; }
  100% { opacity: 0; }
}

/* ==========================================================================
   Solutions
   ========================================================================== */
.solutions { padding: clamp(80px, 10vw, 140px) 0; }

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--light-gray);
  border: 1px solid var(--light-gray);
}
.solution-card {
  display: block;
  position: relative;
  overflow: hidden;
  line-height: 0;
}
.solution-img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s var(--ease);
}
.solution-card:hover .solution-img { transform: scale(1.025); }

/* ==========================================================================
   Solar size calculator
   ========================================================================== */
.calculator { padding: clamp(80px, 10vw, 140px) 0; background: var(--light-gray); }

.calc-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.calc-appliances {
  background: var(--white);
  border: 1px solid rgba(46,46,46,0.08);
}
.calc-row {
  display: grid;
  grid-template-columns: 1.8fr 0.8fr 0.6fr 0.9fr 0.8fr;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--light-gray);
}
.calc-row:last-child { border-bottom: none; }
.calc-row-head {
  background: var(--light-gray);
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-muted);
}
.calc-col-watt, .calc-col-qty, .calc-col-hours, .calc-col-sub { text-align: center; }

.calc-check { display: flex; align-items: center; gap: 10px; font-size: 0.92rem; font-weight: 500; }
.calc-check input[type="checkbox"] { width: 17px; height: 17px; accent-color: var(--green); flex-shrink: 0; }
.calc-row:not(.calc-row-head):has(input[data-role="enable"]:not(:checked)) { opacity: 0.45; }

.calc-watt { text-align: center; font-size: 0.85rem; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.calc-watt-wrap { display: flex; align-items: center; justify-content: center; gap: 4px; font-size: 0.8rem; color: var(--text-muted); }
.calc-watt-wrap .calc-watt-input { width: 56px; }

.calc-input {
  width: 100%;
  max-width: 64px;
  margin: 0 auto;
  display: block;
  text-align: center;
  padding: 7px 4px;
  border: 1px solid rgba(46,46,46,0.15);
  background: var(--white);
  color: var(--charcoal);
  font: inherit;
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}
.calc-input:focus { outline: none; border-color: var(--green); }
.calc-input:disabled { background: var(--light-gray); color: var(--text-muted); }

.calc-subtotal {
  text-align: center;
  font-weight: 700;
  color: var(--deep-green);
  font-variant-numeric: tabular-nums;
  font-size: 0.92rem;
}

.calc-result {
  position: sticky;
  top: calc(var(--header-h-scrolled) + 20px);
  background: var(--deep-green-dark);
  color: var(--white);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
}
.calc-result-label {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  color: rgba(255,255,255,0.6);
}
.calc-result-value {
  font-family: var(--font-display); font-weight: 800;
  font-size: 2.2rem; color: var(--white);
  margin: 8px 0 26px;
  font-variant-numeric: tabular-nums;
}
.calc-result-value small { font-size: 1rem; font-weight: 600; color: rgba(255,255,255,0.55); }
.calc-result-highlight { color: var(--green); }
.calc-result-highlight small { color: rgba(124,194,66,0.7); }

.calc-sun-input { margin-bottom: 26px; }
.calc-sun-input label {
  display: block; font-size: 0.78rem; color: rgba(255,255,255,0.65); margin-bottom: 10px;
}
.calc-sun-input input[type="range"] {
  width: 100%; accent-color: var(--green); margin-bottom: 8px;
}
.calc-sun-value { font-size: 0.85rem; font-weight: 700; color: var(--green); }

.calc-note {
  font-size: 0.78rem; line-height: 1.6; color: rgba(255,255,255,0.55);
  margin-bottom: 22px;
}

/* ==========================================================================
   InduS+
   ========================================================================== */
.indus {
  background: var(--deep-green-dark);
  background-image: radial-gradient(circle at 85% 10%, rgba(124,194,66,0.16), transparent 45%);
  color: var(--white);
  padding: clamp(80px, 10vw, 150px) 0;
}
.indus-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: center;
}
.indus-title { font-size: clamp(3rem, 6vw, 4.5rem); line-height: 1; color: var(--white); }
.indus-subtitle { font-size: 1.15rem; font-weight: 600; color: var(--green); margin-top: 14px; }
.indus-desc { margin-top: 20px; color: rgba(255,255,255,0.75); font-size: 1.02rem; max-width: 520px; }

.indus-features {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px;
  margin: 36px 0 40px;
}
.indus-features li {
  font-size: 0.9rem; font-weight: 500; color: rgba(255,255,255,0.88);
  padding-left: 18px; position: relative;
}
.indus-features li::before {
  content: ''; position: absolute; left: 0; top: 8px;
  width: 7px; height: 7px; background: var(--green);
}

/* Dashboard mockup */
.indus-dashboard { position: relative; }

.laptop-frame { position: relative; filter: drop-shadow(0 40px 60px rgba(0,0,0,0.45)); }
.laptop-screen {
  position: relative;
  background: #060f0c;
  border-radius: 12px 12px 3px 3px;
  padding: 14px 14px 18px;
  border: 1px solid rgba(124,194,66,0.15);
}
.laptop-notch {
  position: absolute;
  top: 4px; left: 50%; transform: translateX(-50%);
  width: 46px; height: 5px; border-radius: 3px;
  background: rgba(124,194,66,0.15);
}
.laptop-base {
  height: 16px;
  margin: 0 -10px;
  background: linear-gradient(180deg, #0d1f19 0%, #081711 100%);
  border-radius: 0 0 10px 10px;
  position: relative;
}
.laptop-base::after {
  content: '';
  position: absolute; left: 50%; top: 0; transform: translateX(-50%);
  width: 90px; height: 6px;
  background: #060f0c;
  border-radius: 0 0 6px 6px;
}

.dash-panel {
  background: #0A2A21;
  border: 1px solid rgba(124,194,66,0.25);
}
.dash-titlebar {
  display: flex; align-items: center; gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(124,194,66,0.18);
}
.dash-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,0.18); }
.dash-title {
  margin-left: 10px; font-size: 0.78rem; font-weight: 600; color: rgba(255,255,255,0.7);
  letter-spacing: 0.02em;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0;
}
.dash-status {
  margin-left: auto; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em;
  color: var(--green); border: 1px solid rgba(124,194,66,0.4);
  padding: 3px 9px;
  flex-shrink: 0;
}
.dash-status::before { content: '● '; }

.dash-metrics {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: rgba(124,194,66,0.15);
}
.dash-metric {
  background: #0A2A21; padding: 20px 20px 22px;
  display: flex; flex-direction: column; gap: 8px;
}
.dash-metric-label { font-size: 0.72rem; color: rgba(255,255,255,0.55); font-weight: 600; letter-spacing: 0.03em; }
.dash-metric-value {
  font-family: var(--font-display); font-size: 1.7rem; font-weight: 700; color: var(--white);
  font-variant-numeric: tabular-nums;
}
.dash-metric-value small { font-size: 0.9rem; font-weight: 600; color: rgba(255,255,255,0.5); }

.dash-flow {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 16px; border-top: 1px solid rgba(124,194,66,0.18);
  flex-wrap: wrap; gap: 8px 4px;
}
.flow-node {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  font-size: 0.66rem; color: rgba(255,255,255,0.7); font-weight: 600;
}
.flow-icon {
  width: 30px; height: 30px; display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(124,194,66,0.35); color: var(--green); font-size: 0.9rem;
  background: rgba(124,194,66,0.06);
}
.flow-arrow { color: rgba(124,194,66,0.5); font-size: 0.8rem; }

.dash-chart {
  padding: 14px 18px 20px; border-top: 1px solid rgba(124,194,66,0.18);
}
.dash-chart svg { width: 100%; height: 70px; }

/* ==========================================================================
   Ecosystem flow
   ========================================================================== */
.ecosystem { padding: clamp(80px, 10vw, 140px) 0; background: var(--light-gray); }

.flow-diagram {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px;
}
.flow-item {
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: 10px;
  flex: 1; min-width: 0;
}
.flow-item-icon {
  width: 74px; height: 74px; border-radius: 50%;
  background: var(--white); border: 1.5px solid rgba(14,90,71,0.15);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.flow-item:hover .flow-item-icon { border-color: var(--green); transform: translateY(-4px); }
.flow-item-icon svg { width: 100%; height: 100%; }
.flow-item-title { font-family: var(--font-display); font-weight: 700; font-size: 0.85rem; letter-spacing: 0.04em; margin-top: 4px; }
.flow-item-sub { font-size: 0.78rem; color: var(--text-muted); }

.flow-connector { flex: 0 0 auto; width: clamp(24px, 5vw, 64px); display: flex; align-items: center; margin-bottom: 34px; }
.flow-connector span {
  display: block; width: 100%; height: 2px; background: var(--green);
  position: relative;
}
.flow-connector span::after {
  content: ''; position: absolute; right: -1px; top: 50%; transform: translateY(-50%);
  border: 4px solid transparent; border-left-color: var(--green);
}

/* ==========================================================================
   Energy storage
   ========================================================================== */
.storage { padding: clamp(80px, 10vw, 140px) 0; }
.storage-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(40px, 6vw, 90px);
  align-items: center;
}
.storage-visuals {
  display: flex; align-items: flex-end; gap: 28px;
  background: var(--light-gray);
  padding: 40px 30px 0;
  position: relative;
  min-height: 380px;
  overflow: hidden;
}
.storage-unit { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.storage-unit-residential { width: 34%; }
.storage-unit-residential svg { width: 100%; }
.storage-unit-commercial { width: 60%; }
.storage-unit-commercial svg { width: 100%; }
.storage-visual-label {
  font-size: 0.72rem; font-weight: 700; color: var(--deep-green);
  text-transform: uppercase; letter-spacing: 0.05em; text-align: center;
  padding-bottom: 22px;
}

.storage-list { margin: 28px 0 36px; display: flex; flex-direction: column; gap: 14px; }
.storage-list li {
  font-size: 1rem; font-weight: 500; padding-left: 30px; position: relative;
}
.storage-list li::before {
  content: ''; position: absolute; left: 0; top: 7px;
  width: 16px; height: 2px; background: var(--green);
}

/* ==========================================================================
   Mongolia
   ========================================================================== */
.mongolia { padding: clamp(80px, 10vw, 140px) 0; background: var(--deep-green-dark); color: var(--white); }
.mongolia .eyebrow { color: var(--green); }
.mongolia .section-head h2 { color: var(--white); }
.mongolia .section-lead { color: rgba(255,255,255,0.65); }

.mongolia-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.mongolia-panel { position: relative; }
.mongolia-visual {
  aspect-ratio: 4 / 3; overflow: hidden; position: relative;
  border: 1px solid rgba(124,194,66,0.2);
}
.mongolia-visual img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease); }
.mongolia-panel:hover .mongolia-visual img { transform: scale(1.06); }
.mongolia-visual::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(200deg, rgba(8,42,33,0.35) 0%, rgba(8,42,33,0.05) 55%);
  pointer-events: none;
}
.mongolia-panel h3 {
  margin-top: 22px; color: var(--white); font-size: 1.15rem;
}
.mongolia-panel p { margin-top: 8px; color: rgba(255,255,255,0.6); font-size: 0.92rem; }

/* ==========================================================================
   Why SES
   ========================================================================== */
.why-ses { padding: clamp(80px, 10vw, 140px) 0; }
.why-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--light-gray);
}
.why-item {
  padding: 36px 28px; border-right: 1px solid var(--light-gray); border-bottom: 1px solid var(--light-gray);
}
.why-number { font-family: var(--font-display); font-weight: 800; font-size: 0.85rem; color: var(--green-dark); }
.why-item h3 { margin-top: 16px; font-size: 1.2rem; }
.why-item p { margin-top: 10px; color: var(--text-muted); font-size: 0.92rem; }

/* ==========================================================================
   About
   ========================================================================== */
.about { padding: clamp(70px, 9vw, 120px) 0; background: var(--light-gray); }
.about-inner { max-width: 760px; }
.about-text { font-size: clamp(1.2rem, 2vw, 1.5rem); line-height: 1.5; font-weight: 500; color: var(--charcoal); margin-bottom: 30px; }

/* ==========================================================================
   CTA
   ========================================================================== */
.cta {
  position: relative;
  background: var(--deep-green-dark);
  color: var(--white);
  padding: clamp(90px, 12vw, 160px) 0;
  text-align: center;
  overflow: hidden;
}
.cta-visual { position: absolute; inset: 0; z-index: 0; }
.cta-visual img { width: 100%; height: 100%; object-fit: cover; object-position: center 30%; }
.cta-visual::after {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 15% 90%, rgba(124,194,66,0.25), transparent 50%),
    linear-gradient(180deg, rgba(8,42,33,0.88) 0%, rgba(8,42,33,0.82) 100%);
}
.cta-inner { position: relative; z-index: 1; max-width: 720px; margin: 0 auto; }
.cta h2 { color: var(--white); font-size: clamp(2rem, 4vw, 3rem); line-height: 1.15; }
.cta p { margin-top: 20px; color: rgba(255,255,255,0.75); font-size: 1.05rem; }
.cta-buttons { display: flex; justify-content: center; flex-wrap: wrap; gap: 18px; margin-top: 42px; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { background: #082922; color: rgba(255,255,255,0.8); }
.footer-inner {
  padding: 80px 0 60px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand .logo { margin-bottom: 18px; }
.footer-tagline { font-size: 0.92rem; color: rgba(255,255,255,0.55); max-width: 220px; }

.footer-col h4 {
  color: var(--white); font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 20px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 12px; }
.footer-col li { font-size: 0.9rem; color: rgba(255,255,255,0.65); }
.footer-col a { transition: color 0.2s var(--ease); }
.footer-col a:hover { color: var(--green); }

.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); }
.footer-bottom-inner { padding: 24px var(--gutter); }
.footer-bottom p { font-size: 0.82rem; color: rgba(255,255,255,0.45); }

/* ==========================================================================
   Scroll reveal
   ========================================================================== */
.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.js .reveal.in-view { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-scroll-cue span { animation: none; }
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1080px) {
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; margin-bottom: 20px; }
}

@media (max-width: 920px) {
  .indus-inner { grid-template-columns: 1fr; }
  .indus-dashboard { order: -1; }
  .storage-inner { grid-template-columns: 1fr; }
  .storage-visuals { order: -1; }
  .mongolia-grid { grid-template-columns: 1fr; gap: 36px; }

  .calc-grid { grid-template-columns: 1fr; }
  .calc-result { position: static; }
}

@media (max-width: 600px) {
  .calc-row {
    grid-template-columns: 1.6fr 0.7fr 0.55fr 0.8fr 0.7fr;
    gap: 6px;
    padding: 12px 12px;
  }
  .calc-check { font-size: 0.8rem; gap: 6px; }
  .calc-watt, .calc-subtotal { font-size: 0.72rem; }
  .calc-row-head { font-size: 0.6rem; }
  .calc-input { max-width: 44px; padding: 6px 2px; font-size: 0.78rem; }
  .calc-watt-wrap .calc-watt-input { width: 40px; }
}

@media (max-width: 768px) {
  :root { --header-h: 72px; --header-h-scrolled: 64px; }

  .main-nav {
    position: fixed; top: var(--header-h); right: 0; bottom: 0;
    width: min(340px, 82vw);
    background: var(--white);
    padding: 32px 28px;
    transform: translateX(100%);
    transition: transform 0.35s var(--ease);
    z-index: 450;
    box-shadow: -20px 0 50px rgba(0,0,0,0.15);
    overflow-y: auto;
  }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav ul { flex-direction: column; align-items: flex-start; gap: 4px; }
  .main-nav .nav-link { display: block; width: 100%; padding: 14px 0; font-size: 1.05rem; color: var(--charcoal) !important; }
  .nav-mobile-actions { display: block; margin-top: 24px; }

  .header-actions .lang-switch { display: none; }
  .header-actions .btn-sm { display: none; }
  .hamburger { display: flex; }

  .hero-values { flex-direction: column; gap: 14px; }

  .solutions-grid { grid-template-columns: 1fr; }
  .indus-features { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .why-item { border-right: none; }

  .flow-diagram { flex-direction: column; }
  .flow-connector { width: 2px; height: 32px; margin-bottom: 0; }
  .flow-connector span { width: 2px; height: 100%; }
  .flow-connector span::after {
    right: auto; top: auto; left: 50%; bottom: -1px; transform: translateX(-50%) rotate(90deg);
  }

  .dash-metrics { grid-template-columns: 1fr 1fr; }
  .dash-flow { justify-content: center; }

  .footer-inner { grid-template-columns: 1fr 1fr; padding: 60px 0 40px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .footer-inner { grid-template-columns: 1fr; }
  .storage-visuals { flex-direction: column; align-items: center; }
  .storage-unit-residential, .storage-unit-commercial { width: 70%; }
}