/* ==========================================================================
   CLIPPER-FANS — PREMIUM BRAND IDENTITY STYLESHEET (CSS3)
   v2.0 — Full Visual Overhaul
   ========================================================================== */

/* ─── 1. DESIGN TOKENS ─── */
:root {
  /* Brand palette */
  --color-green: #009639;
  --color-green-dark: #007A2E;
  --color-green-light: #00B845;
  --color-yellow: #FFD100;
  --color-yellow-soft: #FFE566;
  --color-black: #111111;
  --color-white: #FFFFFF;
  --color-gray-dark: #1A1A1A;
  --color-gray-mid: #2A2A2A;
  --color-gray-light: #F5F5F5;
  --color-gray-border: #E0E0E0;
  --color-text-dark: #111111;
  --color-text-light: #F9F9F9;
  --color-text-muted: #6B6B6B;

  /* Typography */
  --font-headings: 'Montserrat', sans-serif;
  --font-body: 'Inter', 'Roboto', sans-serif;

  /* Motion */
  --ease-smooth: cubic-bezier(0.25, 0.8, 0.25, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.4s var(--ease-smooth);
  --transition-slow: 0.6s var(--ease-smooth);

  /* Spacing */
  --section-pad: clamp(5rem, 10vw, 9rem);
}

/* ─── 2. BASE RESET ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; scroll-padding-top: 80px; }
body {
  font-family: var(--font-body);
  background-color: var(--color-white);
  color: var(--color-text-dark);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── 3. SCROLL PROGRESS BAR ─── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-green), var(--color-yellow));
  z-index: 9999;
  width: 0%;
  transition: width 0.1s linear;
}

/* ─── 4. TYPOGRAPHY ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headings);
  text-transform: uppercase;
}
h1 {
  font-weight: 900;
  font-size: clamp(3.2rem, 9vw, 7rem);
  line-height: 0.88;
  letter-spacing: -3px;
}
h2 {
  font-weight: 800;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -1px;
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}
h2 .accent-dot {
  color: var(--color-green);
}
p {
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}
a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

/* Section label chip above headings */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-green);
  margin-bottom: 1.2rem;
}
.section-label::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 2px;
  background: var(--color-green);
}
.dark-section .section-label { color: var(--color-yellow); }
.dark-section .section-label::before { background: var(--color-yellow); }

/* H2 bottom accent line */
.section-heading-wrap {
  margin-bottom: 3.5rem;
}
.section-heading-wrap h2 {
  margin-bottom: 0;
}
.heading-underline {
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-yellow);
  margin-top: 12px;
  border-radius: 2px;
}
.text-center .heading-underline {
  margin-left: auto;
  margin-right: auto;
}

/* ─── 5. UTILITIES & CONTAINER ─── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}
.text-center { text-align: center; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--color-green);
  color: var(--color-white);
  padding: 1.1rem 2.8rem;
  font-family: var(--font-headings);
  font-weight: 800;
  text-transform: uppercase;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  letter-spacing: 1.5px;
  font-size: 0.85rem;
  transition: var(--transition-fast);
  box-shadow: 0 4px 15px rgba(0, 150, 57, 0.25);
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.5s ease;
}
.btn-primary:hover::after {
  left: 100%;
}
.btn-primary:hover {
  background-color: var(--color-black);
  color: var(--color-yellow);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(17, 17, 17, 0.35);
}
.btn-primary .btn-arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}
.btn-primary:hover .btn-arrow {
  transform: translateX(4px);
}

.badge-fan {
  background-color: var(--color-yellow);
  color: var(--color-black);
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 0.65rem;
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  display: inline-flex;
  align-items: center;
  margin-left: 10px;
  vertical-align: middle;
  animation: pulse-badge 2.5s ease-in-out infinite;
}
@keyframes pulse-badge {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 209, 0, 0.4); }
  50% { box-shadow: 0 0 0 8px rgba(255, 209, 0, 0); }
}

/* ─── 6. SCROLL REVEAL ─── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s var(--ease-smooth), transform 0.7s var(--ease-smooth);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.7s var(--ease-smooth), transform 0.7s var(--ease-smooth);
}
.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}
.reveal-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.7s var(--ease-smooth), transform 0.7s var(--ease-smooth);
}
.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}
/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.5s var(--ease-smooth), transform 0.5s var(--ease-smooth);
}
.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.15s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.3s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.45s; }
.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ─── 7. NAVIGATION / HEADER ─── */
.header {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: box-shadow 0.3s ease;
}
.header.scrolled {
  box-shadow: 0 4px 30px rgba(0,0,0,0.08);
}
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}
.logo-link {
  display: flex;
  align-items: center;
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 1.4rem;
  letter-spacing: -1px;
  color: var(--color-black);
  gap: 0;
}
.logo-link .logo-green { color: var(--color-green); }

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}
.nav-link {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-text-muted);
  padding: 0.5rem 0;
  position: relative;
  transition: color 0.2s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-green), var(--color-yellow));
  transition: width 0.3s var(--ease-smooth);
}
.nav-link:hover { color: var(--color-black); }
.nav-link:hover::after { width: 100%; }

/* Hamburger toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-black);
  transition: var(--transition-fast);
  border-radius: 2px;
}
.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translateY(5.5px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-5.5px);
}

/* ─── 8. HERO BANNER ─── */
.hero {
  position: relative;
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  background-color: var(--color-white);
  overflow: hidden;
  padding: 4rem 0;
}

/* Asymmetric diagonal green block */
.hero-bg-diagonal {
  position: absolute;
  top: 0;
  right: 0;
  width: 52%;
  height: 100%;
  background: linear-gradient(160deg, var(--color-green) 0%, var(--color-green-dark) 100%);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
  z-index: 1;
}

/* Subtle dot pattern overlay on the green block */
.hero-bg-diagonal::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: 2;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 3rem;
  z-index: 10;
  position: relative;
}
.hero-content { max-width: 580px; }

/* Accent line above title */
.hero-accent-line {
  width: 50px;
  height: 4px;
  background: var(--color-green);
  margin-bottom: 1.5rem;
  border-radius: 2px;
}

.hero h1 {
  color: var(--color-black);
  margin-bottom: 0;
}
.hero h1 .text-green { color: var(--color-green); }

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-top: 1.2rem;
  margin-bottom: 2.8rem;
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.8;
  max-width: 480px;
}

.hero-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 560px;
}

/* Glow ring behind the lighter */
.hero-image-wrapper::before {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 150, 57, 0.12), transparent 70%);
  z-index: 1;
  animation: pulse-glow 4s ease-in-out infinite;
}
@keyframes pulse-glow {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.3); opacity: 1; }
}

@keyframes float {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-18px) rotate(1.5deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}
.hero-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 25px 40px rgba(0, 0, 0, 0.2));
  animation: float 6s ease-in-out infinite;
  z-index: 2;
  position: relative;
}

/* ─── 9. STATS MARQUEE RIBBON ─── */
.stats-ribbon {
  background: var(--color-black);
  color: var(--color-white);
  padding: 1.5rem 0;
  overflow: hidden;
  position: relative;
}
.stats-ribbon-inner {
  display: flex;
  gap: 5rem;
  animation: marquee 25s linear infinite;
  white-space: nowrap;
  width: max-content;
}
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.stat-item {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.stat-number {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 1.6rem;
  color: var(--color-yellow);
  letter-spacing: -1px;
}
.stat-text {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 500;
  color: #999;
}
.stat-divider {
  width: 1px;
  height: 30px;
  background: #333;
  flex-shrink: 0;
}

/* ─── 10. HISTORY & TIMELINE ─── */
.history {
  padding: var(--section-pad) 0;
  background-color: var(--color-white);
}
.history-text {
  max-width: 780px;
  margin: 0 auto 5rem auto;
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--color-text-muted);
  text-align: center;
}

/* Vertical Timeline */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-green), var(--color-yellow), var(--color-green));
  transform: translateX(-50%);
}
.timeline-item {
  position: relative;
  width: 50%;
  padding: 1.5rem 3rem;
  margin-bottom: 1rem;
}
.timeline-item:nth-child(odd) { left: 0; text-align: right; }
.timeline-item:nth-child(even) { left: 50%; text-align: left; }

/* Dot on Timeline */
.timeline-dot {
  position: absolute;
  top: 2rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-green);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 3px var(--color-green), 0 0 20px rgba(0, 150, 57, 0.2);
  z-index: 5;
  transition: transform 0.3s var(--ease-bounce), box-shadow 0.3s ease;
}
.timeline-item:hover .timeline-dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 3px var(--color-yellow), 0 0 25px rgba(255, 209, 0, 0.3);
}
.timeline-item:nth-child(odd) .timeline-dot { right: -8px; }
.timeline-item:nth-child(even) .timeline-dot { left: -8px; }

.timeline-year {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 1.8rem;
  color: var(--color-green);
  margin-bottom: 0.75rem;
  letter-spacing: -1px;
}
.timeline-item:nth-child(even) .timeline-year { color: var(--color-black); }

.timeline-content {
  background-color: var(--color-white);
  padding: 2rem;
  border-radius: 6px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.04);
  transition: var(--transition-normal);
  border: 1px solid var(--color-gray-border);
  border-left: 4px solid var(--color-green);
}
.timeline-item:nth-child(odd) .timeline-content {
  border-left: none;
  border-right: 4px solid var(--color-green);
}
.timeline-content:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 35px rgba(0,0,0,0.07);
  border-color: var(--color-green);
}
.timeline-title {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 1rem;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-dark);
}
.timeline-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
  line-height: 1.7;
}

/* ─── 11. ANATOMY / ENGINEERING ─── */
.anatomy {
  padding: var(--section-pad) 0;
  background-color: var(--color-black);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}
/* Subtle grid pattern */
.anatomy::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 0;
}
.anatomy .container { position: relative; z-index: 1; }

.anatomy-header {
  text-align: center;
  margin-bottom: 5rem;
}

.anatomy-grid-outer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}
.anatomy-image-container {
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #1a1a1a 0%, #0d0d0d 100%);
  padding: 3rem;
  border-radius: 12px;
  border: 1px solid #2a2a2a;
  position: relative;
  overflow: hidden;
}
/* Corner accent marks */
.anatomy-image-container::before,
.anatomy-image-container::after {
  content: '';
  position: absolute;
  width: 30px;
  height: 30px;
  border-color: var(--color-green);
  border-style: solid;
}
.anatomy-image-container::before {
  top: 16px;
  left: 16px;
  border-width: 2px 0 0 2px;
}
.anatomy-image-container::after {
  bottom: 16px;
  right: 16px;
  border-width: 0 2px 2px 0;
}

.anatomy-image {
  max-width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: contain;
  filter: drop-shadow(0 10px 25px rgba(0,0,0,0.5));
}

.features-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
.feature-item {
  padding-left: 1.8rem;
  border-left: 3px solid var(--color-yellow);
  position: relative;
  transition: var(--transition-fast);
}
.feature-item:hover {
  border-left-color: var(--color-green);
  padding-left: 2.2rem;
}
.feature-number {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 0.7rem;
  color: var(--color-yellow);
  letter-spacing: 3px;
  margin-bottom: 0.4rem;
  opacity: 0.6;
}
.feature-title {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  color: var(--color-white);
  letter-spacing: 0.5px;
}
.feature-desc {
  font-size: 0.95rem;
  color: #999;
  margin-bottom: 0;
  line-height: 1.7;
}

/* ─── 12. SUPPLY / ECOSYSTEM ─── */
.supply {
  padding: var(--section-pad) 0;
  background-color: var(--color-gray-light);
}
.supply-header {
  text-align: center;
  margin-bottom: 4rem;
}
.supply-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.supply-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: 0px;
  padding: 2.5rem 2rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}
/* Top accent bar on cards */
.supply-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-black);
  transition: background 0.3s ease;
}
.supply-card:hover::before {
  background: linear-gradient(90deg, var(--color-green), var(--color-yellow));
}
.supply-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.08);
  border-color: var(--color-green);
}

.supply-card-number {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 3.5rem;
  color: var(--color-gray-light);
  line-height: 1;
  margin-bottom: 1rem;
  letter-spacing: -2px;
  transition: color 0.3s ease;
}
.supply-card:hover .supply-card-number {
  color: rgba(0, 150, 57, 0.1);
}

.supply-card-top h3 {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 1.35rem;
  margin-bottom: 0.8rem;
  color: var(--color-black);
  letter-spacing: -0.5px;
}
.supply-card-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  flex-grow: 1;
  line-height: 1.7;
}
.supply-link {
  align-self: flex-start;
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-green);
  padding-bottom: 4px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  position: relative;
}
.supply-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-green);
  transition: width 0.3s ease;
}
.supply-card:hover .supply-link::after {
  width: 100%;
}
.supply-link-arrow {
  transition: transform 0.2s ease;
  font-size: 1rem;
}
.supply-card:hover .supply-link-arrow {
  transform: translateX(4px);
}

/* ─── 13. FOOTER ─── */
.footer {
  background-color: var(--color-black);
  color: #666;
  padding: 5rem 0 3rem;
  position: relative;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-green), var(--color-yellow), var(--color-green), transparent);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand-block {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.footer-logo {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 1.5rem;
  color: var(--color-white);
  letter-spacing: -0.5px;
}
.footer-logo .logo-green { color: var(--color-green); }
.footer-tagline {
  font-size: 0.85rem;
  color: #555;
  line-height: 1.7;
  max-width: 280px;
}

.footer-links-col {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}
.footer-links-col h4 {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: #555;
  margin-bottom: 0.5rem;
}
.footer-links-col a {
  font-size: 0.9rem;
  color: #888;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-links-col a:hover {
  color: var(--color-white);
  padding-left: 4px;
}

.footer-cta-block {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1rem;
}
.footer-cta-text {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer-cta-text .text-green { color: var(--color-green); }

.footer-bottom {
  border-top: 1px solid #222;
  padding-top: 2rem;
  text-align: center;
}
.footer-disclaimer {
  font-size: 0.78rem;
  line-height: 1.8;
  margin-bottom: 0;
  color: #555;
}

/* ─── 14. BACK TO TOP BUTTON ─── */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--color-green);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(0,150,57,0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s var(--ease-smooth);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--color-black);
  color: var(--color-yellow);
  transform: translateY(-3px);
}

/* ─── 15. RESPONSIVE DESIGN ─── */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
  .hero-content { max-width: 100%; margin: 0 auto; }
  .hero-accent-line { margin: 0 auto 1.5rem; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-image-wrapper { height: 400px; }
  .hero-bg-diagonal {
    width: 100%;
    height: 45%;
    top: 55%;
    clip-path: polygon(0 25%, 100% 0, 100% 100%, 0% 100%);
  }
  .anatomy-grid-outer {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .anatomy-image-container { order: -1; }
  .supply-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
  .footer-brand-block { align-items: center; }
  .footer-tagline { max-width: 100%; }
  .footer-cta-block { align-items: center; text-align: center; }
  .stats-ribbon-inner { gap: 3rem; }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 15px 30px rgba(0,0,0,0.08);
    text-align: center;
  }
  .nav-menu.active { display: flex; }
  .nav-toggle { display: flex; }

  /* Timeline Responsive */
  .timeline::before { left: 20px; }
  .timeline-item {
    width: 100%;
    padding-left: 55px;
    padding-right: 0;
    text-align: left !important;
  }
  .timeline-item:nth-child(even) { left: 0; }
  .timeline-dot {
    left: 12px !important;
    right: auto !important;
  }
  .timeline-item:nth-child(odd) .timeline-content {
    border-right: none;
    border-left: 4px solid var(--color-green);
  }

  .supply-grid { grid-template-columns: 1fr; }

  h1 { letter-spacing: -1px; }

  .stats-ribbon-inner { gap: 2rem; }
  .stat-number { font-size: 1.3rem; }
}