:root {
  --visio-cream: #fbf7ef;
  --visio-paper: #f3ece0;
  --eyecare-chestnut: #5c2d18;
  --eyecare-gold: #c68b37;
  --eyecare-amber: #e0a953;
  --retina-navy: #1b2a4a;
  --pupil-ink: #221c17;
  --lens-border: #d4c2a5;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-style: 16px;
  --shadow-style: 4px 6px 18px rgba(34, 28, 23, 0.08);
  --section-pad: 10dvh;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-body);
  background-color: var(--visio-cream);
  color: var(--pupil-ink);
  line-height: 1.65;
  font-size: 17px;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--visio-cream);
  overflow-x: hidden;
}

/* Scroll progress indicator */
.opti-scroll-tracker {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: var(--eyecare-gold);
  width: 100%;
  transform-origin: left;
  z-index: 10000;
  animation: opti-progress auto linear;
  animation-timeline: scroll(root block);
}

@keyframes opti-progress {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* Header Styling - Preset J */
.opti-master-head {
  background-color: var(--visio-paper);
  border-bottom: 2px double var(--eyecare-gold);
  position: sticky;
  top: 0;
  z-index: 900;
  padding: 1.2rem 2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.opti-head-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.opti-brand-symbol {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--eyecare-chestnut);
}

.opti-brand-symbol svg {
  width: 38px;
  height: 38px;
  fill: var(--eyecare-chestnut);
}

.opti-brand-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--eyecare-chestnut);
}

.opti-nav-list {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.opti-nav-link {
  text-decoration: none;
  color: var(--retina-navy);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  position: relative;
  transition: color 0.3s ease;
  padding: 0.2rem 0;
}

.opti-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--eyecare-gold);
  transition: width 0.3s ease;
}

.opti-nav-link:hover {
  color: var(--eyecare-chestnut);
}

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

/* Hamburger CSS-only */
.opti-menu-toggle {
  display: none;
}

.opti-hamburger-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.opti-hamburger-btn span {
  width: 26px;
  height: 3px;
  background-color: var(--eyecare-chestnut);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* Layout Blocks */
.opti-hero-stage {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--section-pad) 2rem;
  background: linear-gradient(rgba(251, 247, 239, 0.85), rgba(251, 247, 239, 0.92)), url('img/bg.webp') center/cover no-repeat;
  border-bottom: 1px solid var(--lens-border);
}

.opti-hero-sepia-overlay {
  position: absolute;
  inset: 0;
  backdrop-filter: sepia(25%) brightness(0.95);
  pointer-events: none;
}

.opti-hero-container {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
}

.opti-hero-h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.15;
  color: var(--eyecare-chestnut);
  max-width: 800px;
}

.opti-hero-sub {
  font-size: 1.25rem;
  color: var(--retina-navy);
  max-width: 650px;
}

.opti-btn-pill-double {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 2.2rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--visio-cream);
  background-color: var(--eyecare-chestnut);
  text-decoration: none;
  border-radius: 999px;
  border: 3px double var(--eyecare-gold);
  box-shadow: 0 4px 12px rgba(92, 45, 24, 0.25);
  transition: all 0.3s ease;
  cursor: pointer;
}

.opti-btn-pill-double:hover {
  background-color: var(--retina-navy);
  border-color: var(--visio-cream);
  transform: translateY(-2px);
}

/* Stamp Seal in Corner */
.opti-seal-stamp {
  position: absolute;
  top: 10%;
  right: 5%;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 3px double var(--eyecare-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px;
  background: rgba(243, 236, 224, 0.7);
  transform: rotate(-12deg);
  box-shadow: var(--shadow-style);
  pointer-events: none;
}

.opti-seal-inner-text {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--eyecare-chestnut);
  letter-spacing: 1px;
}

/* Sections General */
.opti-section-wrapper {
  padding: var(--section-pad) 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.opti-content-duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.opti-vintage-frame {
  position: relative;
  border: 2px solid var(--eyecare-chestnut);
  padding: 10px;
  background-color: var(--visio-paper);
  box-shadow: 10px 10px 0px var(--eyecare-gold);
}

.opti-vintage-frame img {
  width: 100%;
  height: auto;
  display: block;
  filter: sepia(15%);
}

.opti-section-h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  color: var(--eyecare-chestnut);
  margin-bottom: 1.2rem;
  line-height: 1.25;
}

.opti-bullet-star-list {
  list-style: none;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.opti-bullet-star-list li {
  position: relative;
  padding-left: 2rem;
  font-size: 1.05rem;
}

.opti-bullet-star-list li::before {
  content: "✦";
  position: absolute;
  left: 0;
  color: var(--eyecare-gold);
  font-size: 1.2rem;
}

/* Guarantee Seals Feature Grid */
.opti-seal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.opti-guarantee-seal-card {
  background-color: var(--visio-paper);
  border: 2px double var(--eyecare-gold);
  border-radius: var(--radius-style);
  padding: 2.5rem 1.8rem;
  text-align: center;
  position: relative;
  transition: transform 0.3s ease;
}

.opti-guarantee-seal-card:hover {
  transform: translateY(-5px);
}

.opti-seal-icon-badge {
  width: 70px;
  height: 70px;
  margin: 0 auto 1.2rem auto;
  border-radius: 50%;
  border: 2px dashed var(--eyecare-chestnut);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--visio-cream);
  color: var(--eyecare-chestnut);
}

.opti-seal-icon-badge svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
}

.opti-dotted-sep {
  border-bottom: 2px dotted var(--lens-border);
  margin: 1rem auto;
  width: 60%;
}

.opti-card-h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--retina-navy);
  margin-bottom: 0.5rem;
}

/* How it works Horizontal Steps */
.opti-steps-horizontal {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  position: relative;
  margin-top: 3rem;
}

.opti-steps-horizontal::before {
  content: "";
  position: absolute;
  top: 40px;
  left: 10%;
  right: 10%;
  height: 2px;
  border-top: 2px dashed var(--eyecare-gold);
  z-index: 1;
}

.opti-step-item {
  position: relative;
  z-index: 2;
  background-color: var(--visio-cream);
  padding: 1rem;
  text-align: center;
}

.opti-step-ring {
  width: 60px;
  height: 60px;
  margin: 0 auto 1rem auto;
  border-radius: 50%;
  background-color: var(--visio-paper);
  border: 3px double var(--eyecare-chestnut);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--eyecare-chestnut);
}

/* CTA Strip */
.opti-cta-vintage-box {
  background-color: var(--retina-navy);
  color: var(--visio-cream);
  padding: 4rem 2rem;
  border-radius: var(--radius-style);
  border: 3px double var(--eyecare-gold);
  text-align: center;
  margin: 4rem auto;
  max-width: 1000px;
}

.opti-cta-vintage-box h2 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--eyecare-amber);
  margin-bottom: 1rem;
}

.opti-cta-vintage-box p {
  max-width: 650px;
  margin: 0 auto 2rem auto;
  font-size: 1.1rem;
  opacity: 0.95;
}

/* Expert Page Specifics */
.opti-expert-frame-center {
  max-width: 55%;
  margin: 0 auto 2.5rem auto;
}

.opti-stat-cluster {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.opti-stat-seal {
  width: 150px;
  height: 150px;
  margin: 0 auto;
  border-radius: 50%;
  border: 4px double var(--eyecare-chestnut);
  background-color: var(--visio-paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px;
  box-shadow: var(--shadow-style);
}

.opti-stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--eyecare-chestnut);
  line-height: 1;
}

.opti-stat-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--retina-navy);
  margin-top: 5px;
  font-weight: 600;
}

.opti-quote-box {
  border-left: 4px solid var(--eyecare-gold);
  padding: 1.5rem 2rem;
  background-color: var(--visio-paper);
  margin: 2.5rem 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-style: italic;
  color: var(--eyecare-chestnut);
  position: relative;
}

/* Reserve / Form Styling */
.opti-form-vintage-card {
  background-color: var(--visio-paper);
  border: 3px double var(--eyecare-chestnut);
  padding: 3rem 2.5rem;
  border-radius: var(--radius-style);
  max-width: 650px;
  margin: 0 auto;
  box-shadow: var(--shadow-style);
}

.opti-field-group {
  margin-bottom: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.opti-field-label {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--eyecare-chestnut);
}

.opti-input-underline {
  border: none;
  border-bottom: 2px solid var(--eyecare-chestnut);
  background: transparent;
  padding: 0.7rem 0.2rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--pupil-ink);
  outline: none;
  transition: border-color 0.3s ease;
}

.opti-input-underline:focus {
  border-bottom-color: var(--eyecare-gold);
}

.opti-checkbox-wrap {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.opti-checkbox-wrap input[type="checkbox"] {
  margin-top: 0.2rem;
  accent-color: var(--eyecare-chestnut);
}

.opti-faq-stack {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  margin-top: 3rem;
}

.opti-faq-item {
  background-color: var(--visio-paper);
  border: 1px solid var(--lens-border);
  padding: 1.5rem;
  border-radius: 8px;
}

.opti-faq-q {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--eyecare-chestnut);
  margin-bottom: 0.5rem;
}

/* Legal & Thank Pages */
.opti-legal-doc {
  max-width: 900px;
  margin: 3rem auto;
  padding: 2.5rem;
  background-color: var(--visio-paper);
  border: 1px solid var(--lens-border);
  border-radius: var(--radius-style);
}

.opti-legal-doc h1 {
  font-family: var(--font-display);
  color: var(--eyecare-chestnut);
  margin-bottom: 1.5rem;
}

.opti-legal-doc h2 {
  font-family: var(--font-display);
  color: var(--retina-navy);
  margin: 2rem 0 1rem 0;
  font-size: 1.4rem;
}

.opti-legal-doc p {
  margin-bottom: 1.2rem;
}

.opti-thank-box {
  text-align: center;
  max-width: 700px;
  margin: 4rem auto;
  padding: 3rem;
  background-color: var(--visio-paper);
  border: 3px double var(--eyecare-gold);
  border-radius: var(--radius-style);
}

.opti-thank-img {
  max-width: 300px;
  height: auto;
  margin: 1.5rem auto;
  border-radius: 8px;
  border: 2px solid var(--eyecare-chestnut);
}

/* Footer */
.opti-master-foot {
  background-color: var(--retina-navy);
  color: var(--visio-cream);
  margin-top: auto;
  padding: 3.5rem 2rem 1.5rem 2rem;
  border-top: 3px double var(--eyecare-gold);
}

.opti-foot-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
  text-align: center;
}

.opti-foot-links {
  display: flex;
  gap: 1.8rem;
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
}

.opti-foot-links a {
  color: var(--visio-paper);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.3s ease;
}

.opti-foot-links a:hover {
  color: var(--eyecare-amber);
}

.opti-disclaimer {
  max-width: 800px;
  font-size: 0.85rem;
  opacity: 0.8;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
}

.opti-copy {
  font-size: 0.85rem;
  opacity: 0.6;
}

/* Cookie Banner */
.opti-cookie-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--pupil-ink);
  color: var(--visio-cream);
  padding: 1.2rem 2rem;
  z-index: 9999;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
  border-top: 2px solid var(--eyecare-gold);
}

.opti-cookie-actions {
  display: flex;
  gap: 1rem;
}

.opti-btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: 0.9rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: opacity 0.3s ease;
}

.opti-btn-accept {
  background-color: var(--eyecare-gold);
  color: var(--pupil-ink);
}

.opti-btn-decline {
  background-color: transparent;
  color: var(--visio-cream);
  border: 1px solid var(--visio-cream);
}

.opti-btn-sm:hover {
  opacity: 0.85;
}

/* Animations Scroll View */
.opti-view-anim {
  animation: opti-fade-in auto linear;
  animation-timeline: view();
  animation-range: entry 10% cover 30%;
}

@keyframes opti-fade-in {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .opti-content-duo {
    grid-template-columns: 1fr;
  }

  .opti-steps-horizontal {
    grid-template-columns: 1fr;
  }

  .opti-steps-horizontal::before {
    display: none;
  }

  .opti-expert-frame-center {
    max-width: 100%;
  }

  .opti-hamburger-btn {
    display: flex;
  }

  .opti-nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--visio-paper);
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 2px double var(--eyecare-gold);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
  }

  .opti-menu-toggle:checked ~ .opti-nav-list {
    display: flex;
  }

  .opti-seal-stamp {
    display: none;
  }

  .opti-cookie-bar {
    flex-direction: column;
    text-align: center;
  }
}