/* ── ESI Homepage ────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

:root {
  --color-primary: #1aac77;
  --color-primary-dark: #148d62;
  --color-primary-glow: rgba(26, 172, 119, 0.15);
  --color-ink: #0c1117;
  --color-ink-soft: #1a2332;
  --color-text: #1c2534;
  --color-text-mid: #475569;
  --color-text-muted: #8494a7;
  --color-bg: #fcfcfd;
  --color-surface: #f1f4f8;
  --color-border: #dfe4eb;
  --font: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1100px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Reset ──────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ── Scroll reveal ──────────────────────────────────────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Buttons ────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.8125rem 2rem;
  border-radius: 100px;
  border: none;
  cursor: pointer;
  transition: all 0.25s var(--ease-out);
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(26, 172, 119, 0.25);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26, 172, 119, 0.3);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
  transform: translateY(-2px);
}

.btn-white {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* ── Navigation ─────────────────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: all 0.4s var(--ease-out);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo img {
  height: 34px;
  width: auto;
  filter: brightness(0) invert(1);
  transition: filter 0.4s;
}

.nav.scrolled {
  background: rgba(252, 252, 253, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--color-border);
}
.nav.scrolled .nav-logo img { filter: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.01em;
  transition: color 0.3s;
}
.nav-links a:hover { color: #fff; }
.nav.scrolled .nav-links a { color: var(--color-text-mid); }
.nav.scrolled .nav-links a:hover { color: var(--color-text); }

.nav-cta { margin-left: 0.25rem; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: #fff;
  margin: 5px 0;
  transition: all 0.3s;
}
.nav.scrolled .nav-toggle span { background: var(--color-text); }

/* ── Hero ───────────────────────────────────────────────────────────── */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 7rem 2rem 5rem;
  background: var(--color-ink);
  overflow: hidden;
}

/* Atmospheric gradient orbs */
.hero::before {
  content: '';
  position: absolute;
  width: 140%;
  height: 140%;
  top: -40%;
  left: -20%;
  background:
    radial-gradient(ellipse 600px 500px at 25% 50%, rgba(26, 172, 119, 0.12), transparent),
    radial-gradient(ellipse 500px 600px at 75% 30%, rgba(26, 100, 172, 0.08), transparent),
    radial-gradient(ellipse 800px 400px at 50% 80%, rgba(26, 172, 119, 0.06), transparent);
  pointer-events: none;
  animation: drift 20s ease-in-out infinite alternate;
}

@keyframes drift {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(20px, -15px) scale(1.03); }
}

/* Noise grain overlay */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  pointer-events: none;
  opacity: 0.5;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
  text-align: center;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.2s var(--ease-out) forwards;
}

.hero-label::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 12px var(--color-primary);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.hero h1 {
  font-family: var(--font);
  font-size: clamp(2.75rem, 6.5vw, 4.25rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 1.75rem;
  opacity: 0;
  animation: fadeUp 0.9s 0.35s var(--ease-out) forwards;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-primary), #3ddfaa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: clamp(1rem, 1.8vw, 1.1875rem);
  color: rgba(255, 255, 255, 0.5);
  max-width: 540px;
  margin: 0 auto 2.75rem;
  line-height: 1.75;
  opacity: 0;
  animation: fadeUp 0.9s 0.5s var(--ease-out) forwards;
}

.hero-actions {
  display: flex;
  gap: 0.875rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.9s 0.65s var(--ease-out) forwards;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Scroll hint */
.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 1.2s var(--ease-out) forwards;
}

.hero-scroll span {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.3);
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.25), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { transform: scaleY(1); opacity: 0.6; }
  50%      { transform: scaleY(0.5); opacity: 0.2; }
}

/* ── Features ───────────────────────────────────────────────────────── */

.features {
  padding: 7rem 2rem;
}

.features-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-label {
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.section-heading {
  font-family: var(--font);
  font-size: clamp(1.75rem, 3.5vw, 2.375rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.section-sub {
  font-size: 1.0625rem;
  color: var(--color-text-mid);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.feature-card {
  position: relative;
  padding: 2.25rem 2rem;
  border-radius: 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  transition: all 0.4s var(--ease-out);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0;
  transition: opacity 0.4s;
}

.feature-card:hover {
  border-color: transparent;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 8px 32px rgba(0, 0, 0, 0.06);
  transform: translateY(-3px);
}
.feature-card:hover::before { opacity: 1; }

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.feature-card h3 {
  font-family: var(--font);
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--color-text-mid);
  line-height: 1.65;
}

/* ── Values ─────────────────────────────────────────────────────────── */

.values {
  padding: 7rem 2rem;
  background: var(--color-surface);
  position: relative;
}

.values-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.mission-text {
  max-width: 680px;
  margin: 0 auto 4rem;
  text-align: center;
  font-size: clamp(1.0625rem, 2vw, 1.1875rem);
  color: var(--color-text-mid);
  line-height: 1.8;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.value-card {
  text-align: center;
  padding: 2rem 1.25rem;
  border-radius: 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  transition: all 0.3s var(--ease-out);
}
.value-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.value-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-ink);
  color: var(--color-primary);
  font-size: 0.8125rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.value-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.value-card p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ── CTA Banner ─────────────────────────────────────────────────────── */

.cta-banner {
  position: relative;
  padding: 6rem 2rem;
  background: var(--color-ink);
  text-align: center;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  pointer-events: none;
}

.cta-banner h2 {
  position: relative;
  font-family: var(--font);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.cta-banner p {
  position: relative;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 2.25rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cta-banner .btn { position: relative; }

/* ── Footer ─────────────────────────────────────────────────────────── */

.footer {
  padding: 2rem 2rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--color-text); }

/* ── Responsive ─────────────────────────────────────────────────────── */

@media (max-width: 900px) {
  .features-grid { grid-template-columns: 1fr; }
  .values-grid   { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(252, 252, 253, 0.98);
    backdrop-filter: blur(16px);
    padding: 1.5rem 2rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-links.open { display: flex; }
  .nav-links.open a { color: var(--color-text-mid) !important; }
  .nav-cta { margin-left: 0; width: 100%; }
  .nav-cta .btn { width: 100%; justify-content: center; }
  .nav-toggle { display: block; }

  .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .hero { min-height: auto; padding: 8rem 1.5rem 5rem; }
  .hero-scroll { display: none; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 300px; justify-content: center; }

  .features, .values { padding: 4.5rem 1.5rem; }
  .values-grid { grid-template-columns: 1fr; }

  .footer-inner { flex-direction: column; text-align: center; }
}