/* ==========================================================================
   REEForge Design System & Stylesheet
   Vanilla CSS3 - High-Performance, Responsive & Accessible
   ========================================================================== */

/* --- Custom Properties / Design Tokens --- */
:root {
  /* Brand Palette */
  --color-bg-dark: #0A1214;
  --color-bg-card-dark: #0F1D20;
  --color-bg-deep-green: #08211E;
  --color-bg-forest: #0B2A26;
  --color-bg-forest-light: #103833;
  --color-bg-cream: #F5F3EC;
  --color-bg-cream-card: #FAF8F2;
  --color-border-cream: #E4E0D5;

  /* Accent Colors */
  --color-lime: #B8E936;
  --color-lime-hover: #A5D32D;
  --color-lime-glow: rgba(184, 233, 54, 0.25);
  --color-terracotta: #D26437;
  --color-terracotta-glow: rgba(210, 100, 55, 0.25);

  /* Typography Colors */
  --color-text-white: #FFFFFF;
  --color-text-light: #E4ECEB;
  --color-text-muted: #8E9F9D;
  --color-text-dark: #0D1917;
  --color-text-dark-muted: #536260;

  /* Borders & Dividers */
  --color-border-dark: rgba(255, 255, 255, 0.08);
  --color-border-dark-hover: rgba(255, 255, 255, 0.2);
  --color-border-green: rgba(184, 233, 54, 0.2);

  /* Fonts */
  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Space Mono', 'JetBrains Mono', Consolas, monospace;

  /* Layout & Spacing */
  --max-width: 1240px;
  --section-pad-y: clamp(70px, 9vw, 130px);
  --container-pad-x: clamp(20px, 4vw, 48px);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Global Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

/* --- Container Utility --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad-x);
  padding-right: var(--container-pad-x);
}

/* --- Header Scroll Progress Bar --- */
.scroll-progress-container {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2.5px;
  background: rgba(255, 255, 255, 0.04);
}

.scroll-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #B8E936, #5FBFA4);
  transition: width 0.08s ease-out;
}

/* --- Section Labels & Badges --- */
.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(184, 233, 54, 0.35);
  background: rgba(184, 233, 54, 0.08);
  color: var(--color-lime);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-lime);
  margin-bottom: 20px;
}

.section-label.light-theme {
  color: #17544C;
}

.section-title {
  font-size: clamp(2.2rem, 4.4vw, 3.6rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--color-text-white);
  margin-bottom: 20px;
}

.section-title.light-theme {
  color: var(--color-text-dark);
}

.section-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.55;
  color: var(--color-text-muted);
  max-width: 680px;
}

.section-subtitle.light-theme {
  color: var(--color-text-dark-muted);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-smooth);
  text-align: center;
}

.btn-primary {
  background-color: var(--color-lime);
  color: #0A1315;
}

.btn-primary:hover {
  background-color: var(--color-lime-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-lime-glow);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--color-text-white);
  border: 1px solid var(--color-border-dark-hover);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-2px);
}

/* --- Header / Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 18, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background-color var(--transition-smooth);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-white);
}

.brand-icon {
  width: 28px;
  height: 28px;
  color: var(--color-lime);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-light);
  position: relative;
}

.nav-link:hover {
  color: var(--color-lime);
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0%;
  height: 2px;
  background-color: var(--color-lime);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* --- Three Dots More Menu --- */
.more-menu-wrapper {
  position: relative;
}

.more-menu-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border-dark-hover);
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.more-menu-btn:hover,
.more-menu-btn[aria-expanded="true"] {
  background: rgba(184, 233, 54, 0.12);
  border-color: var(--color-lime);
  color: var(--color-lime);
}

.more-dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 240px;
  background: #0B1719;
  border: 1px solid var(--color-border-dark-hover);
  border-radius: var(--radius-md);
  padding: 8px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.65);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: 1200;
  list-style: none;
}

.more-dropdown-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.more-dropdown-item a,
.more-dropdown-item button {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--color-text-light);
  border-radius: 6px;
  text-align: left;
  border: none;
  background: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.more-dropdown-item a:hover,
.more-dropdown-item button:hover {
  background: rgba(184, 233, 54, 0.1);
  color: var(--color-lime);
}

.more-dropdown-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.08);
  margin: 6px 0;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  padding: 8px;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-white);
  transition: all var(--transition-fast);
}

/* --- Hero Section --- */
.hero-section {
  padding-top: calc(80px + clamp(40px, 6vw, 90px));
  padding-bottom: clamp(50px, 6vw, 80px);
  background: radial-gradient(circle at 80% 20%, rgba(18, 56, 50, 0.45), transparent 60%),
              radial-gradient(circle at 20% 70%, rgba(184, 233, 54, 0.04), transparent 50%),
              var(--color-bg-dark);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(40px, 5vw, 80px);
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-title {
  font-size: clamp(2.5rem, 5.2vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text-white);
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 36px;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
}

/* --- Periodic Table Grid (Hero Right) --- */
.element-showcase {
  background: rgba(15, 29, 32, 0.6);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.periodic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.element-card {
  position: relative;
  aspect-ratio: 1;
  background-color: var(--color-bg-card-dark);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-smooth);
  cursor: pointer;
  user-select: none;
}

.element-card:hover {
  transform: translateY(-4px) scale(1.02);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
  z-index: 2;
}

.element-number {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

.element-symbol {
  font-size: clamp(1.4rem, 2.4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-white);
}

.element-name {
  font-size: 0.68rem;
  color: var(--color-text-muted);
  opacity: 0.8;
  font-weight: 500;
}

/* Highlighted Cards (Neodymium & Dysprosium) */
.element-card.highlight-lime {
  background-color: var(--color-lime);
  border-color: var(--color-lime);
  box-shadow: 0 8px 30px var(--color-lime-glow);
}

.element-card.highlight-lime .element-number,
.element-card.highlight-lime .element-name {
  color: #1A2800;
  font-weight: 600;
}

.element-card.highlight-lime .element-symbol {
  color: #0B1400;
}

.element-card.highlight-terracotta {
  background-color: var(--color-terracotta);
  border-color: var(--color-terracotta);
  box-shadow: 0 8px 30px var(--color-terracotta-glow);
}

.element-card.highlight-terracotta .element-number,
.element-card.highlight-terracotta .element-name {
  color: #2F1005;
  font-weight: 600;
}

.element-card.highlight-terracotta .element-symbol {
  color: #170702;
}

/* Hero Bottom 3-Step Teaser Strip */
.hero-bottom-strip {
  margin-top: clamp(40px, 5vw, 60px);
  padding-top: 36px;
  border-top: 1px solid var(--color-border-dark);
}

.step-strip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.step-item-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-lime);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.step-item-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 8px;
}

.step-item-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --- Deeptech Proof Metrics Strip --- */
.metrics-strip {
  background: #081619;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 36px;
  padding-bottom: 36px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.metric-card {
  display: flex;
  flex-direction: column;
  padding: 12px 20px;
  border-left: 2px solid rgba(184, 233, 54, 0.4);
}

.metric-number {
  font-size: clamp(1.6rem, 2.8vw, 2.3rem);
  font-weight: 800;
  color: var(--color-lime);
  line-height: 1.1;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.metric-label {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 4px;
}

.metric-sub {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* --- Technology Section --- */
.tech-section {
  padding-top: var(--section-pad-y);
  padding-bottom: var(--section-pad-y);
  background: radial-gradient(circle at 90% 50%, rgba(184, 233, 54, 0.05), transparent 50%),
              var(--color-bg-forest);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.tech-header-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
  margin-bottom: clamp(50px, 7vw, 90px);
}

.protein-graphic-wrap {
  position: relative;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
}

/* Biotech Schematic Keyframe Animations */
@keyframes pulseBindingSite {
  0%, 100% {
    r: 26;
    stroke-opacity: 0.7;
  }
  50% {
    r: 30;
    stroke-opacity: 1;
    stroke-width: 2.5;
  }
}

@keyframes ionFloatSlow {
  0%, 100% {
    transform: translateY(0px) scale(1);
  }
  50% {
    transform: translateY(-5px) scale(1.05);
  }
}

@keyframes ionFloatAlt {
  0%, 100% {
    transform: translateY(0px) scale(1);
  }
  50% {
    transform: translateY(4px) scale(0.95);
  }
}

.animated-binding-ring {
  animation: pulseBindingSite 3.6s ease-in-out infinite;
  transform-origin: center;
}

.animated-ion-lime {
  animation: ionFloatSlow 4s ease-in-out infinite;
  transform-origin: center;
}

.animated-ion-terracotta {
  animation: ionFloatAlt 4.5s ease-in-out infinite;
  transform-origin: center;
}

.tech-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(24px, 3.5vw, 40px);
}

.tech-card {
  background: rgba(8, 33, 30, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: all var(--transition-smooth);
}

.tech-card:hover {
  background: rgba(8, 33, 30, 0.85);
  border-color: var(--color-lime);
  transform: translateY(-4px);
}

.tech-card-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-lime);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.tech-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 12px;
}

.tech-card-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-light);
  opacity: 0.85;
}

/* --- Section Transition Softeners --- */
.transition-curve-to-light {
  height: clamp(40px, 6vw, 70px);
  background: linear-gradient(to bottom, var(--color-bg-forest), var(--color-bg-cream));
  width: 100%;
}

.transition-curve-to-dark {
  height: clamp(40px, 6vw, 70px);
  background: linear-gradient(to bottom, var(--color-bg-cream), var(--color-bg-forest));
  width: 100%;
}

/* --- Feedstocks Section (Warm Sandstone Theme) --- */
.feedstocks-section {
  padding-top: clamp(40px, 5vw, 80px);
  padding-bottom: clamp(50px, 6vw, 90px);
  background-color: var(--color-bg-cream);
  color: var(--color-text-dark);
}

.feedstocks-header {
  margin-bottom: clamp(40px, 6vw, 70px);
}

.feedstocks-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feedstock-card {
  background-color: var(--color-bg-cream-card);
  border: 1px solid var(--color-border-cream);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 215px;
  transition: all var(--transition-smooth);
}

.feedstock-card:hover {
  transform: translateY(-4px);
  border-color: #C7C2B2;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
}

.feedstock-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.feedstock-icon-wrap {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: rgba(23, 84, 76, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #17544C;
  flex-shrink: 0;
}

.feedstock-icon-wrap svg {
  width: 20px;
  height: 20px;
}

.feedstock-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #17544C;
  display: block;
}

.feedstock-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 10px;
  line-height: 1.25;
}

.feedstock-desc {
  font-size: 0.9rem;
  color: var(--color-text-dark-muted);
  line-height: 1.45;
}

/* CTA Feedstock Card */
.feedstock-card.cta-card {
  background-color: #0B2B27;
  border-color: #0B2B27;
  color: var(--color-text-white);
  justify-content: space-between;
}

.feedstock-card.cta-card:hover {
  box-shadow: 0 16px 36px rgba(11, 43, 39, 0.25);
}

.feedstock-card.cta-card .feedstock-icon-wrap {
  background: rgba(184, 233, 54, 0.15);
  color: var(--color-lime);
}

.feedstock-card.cta-card .feedstock-title {
  color: var(--color-text-white);
  font-size: 1.35rem;
  line-height: 1.3;
}

.feedstock-card.cta-card .btn {
  width: 100%;
  padding: 12px 18px;
  font-size: 0.88rem;
  margin-top: 16px;
}

/* --- About Section --- */
.about-section {
  padding-top: clamp(40px, 5vw, 80px);
  padding-bottom: var(--section-pad-y);
  background-color: var(--color-bg-forest);
}

.about-header {
  margin-bottom: clamp(48px, 6vw, 75px);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(24px, 3.5vw, 40px);
}

.team-card {
  display: flex;
  flex-direction: column;
}

.team-avatar-box {
  width: 100%;
  aspect-ratio: 1 / 1;
  background-color: #0D332E;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  transition: all var(--transition-smooth);
}

.team-card:hover .team-avatar-box {
  border-color: var(--color-lime);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45), 0 0 24px rgba(184, 233, 54, 0.2);
}

.team-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
  display: block;
  transition: transform var(--transition-smooth);
}

.team-photo--anusha {
  object-position: center 18%;
}

.team-card:hover .team-photo {
  transform: scale(1.04);
}

.team-avatar-box.avatar-lime {
  background-color: var(--color-lime);
  border-color: var(--color-lime);
}

.team-initial {
  font-size: clamp(3.5rem, 6vw, 5.5rem);
  font-weight: 800;
  color: var(--color-text-white);
  user-select: none;
}

.team-avatar-box.avatar-lime .team-initial {
  color: #0D1917;
}

.photo-badge {
  position: absolute;
  bottom: 12px;
  right: 14px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.team-avatar-box.avatar-lime .photo-badge {
  color: #2F4000;
}

.team-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 6px;
}

.team-role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-lime);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.team-bio {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-text-light);
  opacity: 0.85;
}

/* --- For Investors / Contact Section --- */
.contact-section {
  padding-top: var(--section-pad-y);
  padding-bottom: var(--section-pad-y);
  background-color: var(--color-bg-dark);
  border-top: 1px solid var(--color-border-dark);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: flex-start;
}

.contact-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 36px;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding-top: 10px;
}

.contact-info-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 20px;
}

.contact-info-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.contact-info-val {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  font-weight: 700;
  color: var(--color-text-white);
}

.contact-info-val a:hover {
  color: var(--color-lime);
}

/* --- Footer --- */
.site-footer {
  background-color: #070D0E;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 48px;
  padding-bottom: 48px;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-lime);
}

/* --- Floating Back to Top Button --- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 900;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(15, 29, 32, 0.85);
  border: 1px solid rgba(184, 233, 54, 0.4);
  color: var(--color-lime);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-smooth);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-lime);
  color: #0A1315;
  transform: translateY(-3px);
  box-shadow: 0 10px 30px var(--color-lime-glow);
}

/* --- Accessible Modal / Dialog --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-container {
  background-color: var(--color-bg-card-dark);
  border: 1px solid var(--color-border-dark-hover);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 560px;
  padding: clamp(24px, 4vw, 36px);
  position: relative;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
  transform: translateY(20px);
  transition: transform var(--transition-smooth);
}

.modal-overlay.active .modal-container {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: background var(--transition-fast);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-text-white);
}

.modal-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 8px;
}

.modal-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}

.notice-banner {
  background: rgba(184, 233, 54, 0.08);
  border-left: 3px solid var(--color-lime);
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 20px;
  line-height: 1.5;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--color-border-dark);
  color: var(--color-text-white);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-lime);
}

textarea.form-control {
  resize: vertical;
  min-height: 90px;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

/* --- Element Details Drawer/Popup --- */
.element-tooltip-box {
  margin-top: 14px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.85rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.element-tooltip-box .badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-lime);
}

/* --- Responsive Media Queries --- */
.nav-mobile-action {
  display: none;
}

@media (max-width: 1080px) {
  .feedstocks-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .site-header {
    padding-top: max(14px, env(safe-area-inset-top));
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .tech-header-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .tech-features-grid,
  .step-strip-grid,
  .team-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .mobile-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 10px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border-dark);
  }

  .mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text-white);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
    transform-origin: center;
  }

  .mobile-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .mobile-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .mobile-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .nav-menu {
    position: fixed;
    top: 76px;
    right: -100%;
    width: min(320px, 86vw);
    height: calc(100dvh - 76px);
    height: calc(100vh - 76px);
    background: rgba(9, 19, 21, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid rgba(255, 255, 255, 0.08);
    flex-direction: column;
    align-items: flex-start;
    padding: 28px 24px;
    padding-bottom: max(32px, env(safe-area-inset-bottom));
    gap: 16px;
    transition: right var(--transition-smooth);
    box-shadow: -10px 0 35px rgba(0, 0, 0, 0.65);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: 1000;
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu .nav-link {
    display: block;
    width: 100%;
    padding: 10px 0;
    font-size: 1.1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

  .nav-mobile-action {
    display: block;
    width: 100%;
    margin-top: 8px;
    padding-top: 8px;
  }

  .nav-actions .btn-primary {
    display: none;
  }
}

@media (max-width: 600px) {
  /* Prevent iOS Safari automatic zoom on inputs */
  .form-control,
  input[type="text"],
  input[type="email"],
  textarea {
    font-size: 16px !important;
  }

  .hero-section {
    padding-top: calc(76px + 28px);
    padding-bottom: 48px;
  }

  .hero-title {
    font-size: clamp(2.1rem, 8.5vw, 2.75rem);
    letter-spacing: -0.025em;
  }

  .section-title {
    font-size: clamp(1.8rem, 7vw, 2.3rem);
  }

  .feedstocks-grid,
  .metrics-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .hero-cta-group,
  .contact-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-cta-group .btn,
  .contact-cta-group .btn {
    width: 100%;
    padding: 14px 20px;
  }

  /* Periodic Table on Mobile */
  .periodic-table-card {
    padding: 18px 14px;
    border-radius: var(--radius-md);
  }

  .periodic-grid {
    gap: 6px;
  }

  .element-card {
    padding: 6px;
    min-height: 72px;
  }

  .element-number {
    font-size: 0.65rem;
  }

  .element-symbol {
    font-size: 1.5rem;
  }

  .element-name {
    font-size: 0.6rem;
  }

  .element-desc-box {
    padding: 12px 14px;
    margin-top: 14px;
  }

  /* Founder Cards on Mobile */
  .team-card {
    max-width: 360px;
    margin-inline: auto;
    width: 100%;
  }

  .team-avatar-box {
    margin-bottom: 16px;
  }

  /* Accessible Touch Modals */
  .modal-overlay {
    padding: 12px;
    align-items: flex-end; /* Mobile bottom sheet alignment */
  }

  .modal-container {
    border-radius: var(--radius-lg) var(--radius-lg) 12px 12px;
    padding: 24px 18px;
    max-height: 86dvh;
    max-height: 86vh;
    padding-bottom: max(24px, env(safe-area-inset-bottom));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .modal-close-btn {
    width: 44px;
    height: 44px;
    top: 10px;
    right: 10px;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .back-to-top {
    bottom: max(20px, env(safe-area-inset-bottom));
    right: max(20px, env(safe-area-inset-right));
    width: 44px;
    height: 44px;
  }
}