/* ==========================================================================
   Design System & Variable Declarations (Classic & Intellectual Navy/Gold)
   ========================================================================== */
:root {
  /* Color Palette - Traditional, High-End & Muted Colors */
  --primary: #1a2a3a;          /* Deep Navy Blue (Intellect & Prestige) */
  --primary-light: #34485e;    /* Muted Navy */
  --primary-bg: #f5f2eb;       /* Warm Sand Beige */
  --primary-border: #ebdcc5;   /* Light Gold/Beige Border */

  --accent: #c5a880;           /* Antique Gold (Classic Premium Accent) */
  --accent-dark: #aa8c64;      /* Burnished Bronze */
  --accent-light: #faf8f5;     /* Warm Creamy Ivory */

  --dark: #111111;             /* Matte Black */
  --neutral-dark: #2b333a;     /* Charcoal Slate Text */
  --neutral-muted: #5a636a;    /* Soft Gray Text */
  --white: #ffffff;
  
  --error: #a83232;            /* Deep Muted Red (Accessible) */
  --error-bg: #fff5f5;

  /* Typography */
  --font-base: 'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;
  --font-display: 'Playfair Display', serif; /* Classical Serifs for English accents */

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.8rem;
  --spacing-lg: 3.5rem;
  --spacing-xl: 7rem;

  /* UI Tokens */
  --border-radius-sm: 2px;     /* Sharp editorial corners for a tailored look */
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  --shadow-sm: 0 4px 20px rgba(26, 42, 58, 0.03);
  --shadow-md: 0 16px 40px rgba(26, 42, 58, 0.06);
  --shadow-lg: 0 32px 80px rgba(26, 42, 58, 0.12);

  /* Motion */
  --transition-fast: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-normal: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  font-family: var(--font-base);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.85;
  color: var(--neutral-dark);
  background-color: var(--accent-light);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--primary);
  color: var(--white);
  padding: 0.8rem 1.6rem;
  z-index: 9999;
  border-radius: 0 0 4px 4px;
  font-weight: 500;
  transition: top var(--transition-fast);
  border: 1px solid var(--accent);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--accent);
}

*:focus-visible {
  outline: 2px dashed var(--accent);
  outline-offset: 4px;
}

/* ==========================================================================
   Reusable Styles (Tailored Editorial Vibe)
   ========================================================================== */
.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.section-header::after {
  content: '';
  display: block;
  width: 40px;
  height: 1.5px;
  background-color: var(--accent);
  margin: var(--spacing-sm) auto 0 auto;
}

.section-subtitle {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  color: var(--accent-dark);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: 2.3rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.05em;
}

.section-header p {
  color: var(--neutral-muted);
  max-width: 650px;
  margin: 0.8rem auto 0 auto;
  font-size: 0.95rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 2.4rem;
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border-radius: var(--border-radius-sm);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: transparent;
  color: var(--neutral-dark);
  border-color: var(--neutral-dark);
}

.btn-secondary:hover {
  background-color: var(--neutral-dark);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary);
  color: var(--white);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.main-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--primary-border);
  transition: background-color var(--transition-fast);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.2rem var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo a {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.logo-icon {
  width: 60px;
  height: 25px;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.1em;
}

.logo-subtext {
  font-family: var(--font-display);
  font-size: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--neutral-muted);
  display: block;
  margin-top: 0.15rem;
}

.main-nav ul {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 2.2rem;
}

.main-nav a {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--neutral-dark);
  padding: 0.4rem 0;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--accent);
  transition: width var(--transition-fast);
}

.main-nav a:hover {
  color: var(--accent-dark);
}

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

.main-nav .nav-cta {
  background-color: var(--primary);
  color: var(--white);
  padding: 0.7rem 1.6rem;
  border-radius: var(--border-radius-sm);
  font-weight: 500;
  border: 1.5px solid var(--primary);
  transition: all var(--transition-fast);
}

.main-nav .nav-cta:hover {
  background-color: transparent;
  color: var(--primary);
}

.main-nav .nav-cta::after {
  display: none;
}

/* Mobile Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-toggle .bar {
  width: 100%;
  height: 1.5px;
  background-color: var(--primary);
  transition: all var(--transition-fast);
}

/* ==========================================================================
   Mobile Menu Overlay
   ========================================================================== */
.mobile-menu {
  position: fixed;
  top: 75px;
  left: 0;
  width: 100%;
  height: calc(100vh - 75px);
  background-color: var(--accent-light);
  z-index: 999;
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: translateY(0);
  opacity: 1;
  transition: all var(--transition-normal);
}

.mobile-menu[hidden] {
  transform: translateY(-15px);
  opacity: 0;
  pointer-events: none;
  display: none !important;
}

.mobile-menu ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.mobile-menu a {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--neutral-dark);
  display: block;
  padding: 0.6rem 0;
  border-bottom: 1.5px solid var(--primary-border);
}

.mobile-menu .nav-cta {
  background-color: var(--primary);
  color: var(--white);
  text-align: center;
  border-radius: var(--border-radius-sm);
  border-bottom: none;
  padding: 0.8rem 0;
}

/* ==========================================================================
   Hero Section (Geometric Split Layout)
   ========================================================================== */
.hero-section {
  background: linear-gradient(135deg, var(--white) 35%, var(--primary-bg) 100%);
  padding: 4.5rem 0;
  position: relative;
  overflow: hidden;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-text-side h1 {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  line-height: 1.35;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--spacing-md);
}

.hero-text-side .highlight {
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.hero-text-side .highlight::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 0;
  width: 100%;
  height: 6px;
  background-color: var(--accent);
  z-index: -1;
}

.hero-text-side p {
  font-size: 1.05rem;
  color: var(--neutral-muted);
  margin-bottom: 2.5rem;
  max-width: 530px;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
}

/* Hero Geometric Visual Stack */
.hero-visual-side {
  position: relative;
  height: 440px;
}

.hero-geometric-illustration {
  position: relative;
  width: 100%;
  height: 100%;
}

.geo-bg-pattern {
  position: absolute;
  top: 15%;
  left: 10%;
  width: 320px;
  height: 320px;
  border: 1px dashed var(--accent);
  border-radius: 50%;
  z-index: 1;
}

.geo-bg-pattern::before {
  content: '';
  position: absolute;
  top: -20px;
  left: -20px;
  right: -20px;
  bottom: -20px;
  border: 1px solid rgba(197, 168, 128, 0.15);
  border-radius: 50%;
  transform: rotate(45deg);
}

.geo-card {
  position: absolute;
  background-color: var(--white);
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-md);
  border: 1.5px solid var(--primary-border);
  padding: 1.2rem;
  z-index: 2;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.main-glass-card {
  left: 0;
  top: 10%;
  width: 88%;
  perspective: 1000px;
}

.main-glass-card:hover {
  transform: translateY(-6px) rotateX(2deg) rotateY(-2deg);
  box-shadow: var(--shadow-lg);
  z-index: 4;
}

.glasses-detail-svg {
  width: 100%;
  height: auto;
  display: block;
}

.geo-card-label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-style: italic;
  color: var(--accent-dark);
  text-align: center;
  margin-top: 0.8rem;
  letter-spacing: 0.05em;
}

.sub-measure-card {
  right: 5%;
  bottom: 8%;
  width: 44%;
  z-index: 3;
}

.sub-measure-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.geo-measure-title {
  display: block;
  font-family: var(--font-display);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--accent-dark);
  margin-bottom: 0.5rem;
}

.geo-grid-pattern {
  position: relative;
  height: 50px;
  background-color: var(--accent-light);
  border: 1px solid var(--primary-border);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.grid-line-vertical {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  background-color: rgba(26, 42, 58, 0.1);
  left: 50%;
}

.grid-dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent);
  border-radius: 50%;
  z-index: 2;
  box-shadow: 0 0 8px var(--accent);
}

.grid-val {
  position: absolute;
  bottom: 2px;
  right: 4px;
  font-size: 0.6rem;
  font-family: var(--font-display);
  color: var(--neutral-muted);
}

.sub-measure-card p {
  font-size: 0.75rem;
  color: var(--neutral-muted);
  line-height: 1.4;
}

/* ==========================================================================
   Philosophy Section (Visual Lens Masking Effect)
   ========================================================================== */
.philosophy-section {
  background-color: var(--white);
}

.philosophy-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 5rem;
  align-items: center;
}

.philosophy-text-pane h2 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.35;
}

.lead-text {
  font-size: 1.1rem;
  color: var(--accent-dark);
  margin-bottom: 2.2rem;
  font-weight: 400;
}

.feature-item {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.feature-item:last-of-type {
  margin-bottom: 0;
}

.feat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--accent);
  font-weight: 400;
  line-height: 1;
}

.feature-item h3 {
  font-size: 1.15rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 0.4rem;
}

.feature-item p {
  font-size: 0.9rem;
  color: var(--neutral-muted);
  line-height: 1.7;
}

/* Decorative Lens Visual Container */
.philosophy-deco-pane {
  display: flex;
  justify-content: center;
}

.oval-mask-wrapper {
  position: relative;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background-color: var(--primary-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: inset 0 8px 32px rgba(26, 42, 58, 0.04);
}

.lens-visual {
  width: 250px;
  height: 250px;
  position: relative;
  cursor: pointer;
  transition: transform var(--transition-normal);
}

.lens-visual:hover {
  transform: scale(1.05);
}

.lens-rim {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 10px solid var(--primary);
  border-radius: 50%;
  z-index: 3;
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
}

.lens-glass {
  position: absolute;
  top: 8px;
  left: 8px;
  right: 8px;
  bottom: 8px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0) 60%), rgba(197, 168, 128, 0.05);
  backdrop-filter: blur(2px);
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
}

.lens-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--primary);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.1em;
}

/* ==========================================================================
   Collection / Frames Section (Tab Panels)
   ========================================================================== */
.collection-section {
  background-color: var(--accent-light);
}

.collection-tabs-container {
  max-width: 1000px;
  margin: 0 auto;
}

.collection-tab-list {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--primary-border);
  padding-bottom: 1rem;
  role: tablist;
}

.collection-tab-btn {
  background: none;
  border: none;
  color: var(--neutral-muted);
  font-size: 1.05rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0.5rem 1rem;
  position: relative;
  transition: color var(--transition-fast);
}

.collection-tab-btn::after {
  content: '';
  position: absolute;
  bottom: -18px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

.collection-tab-btn:hover {
  color: var(--primary);
}

.collection-tab-btn.active {
  color: var(--primary);
  font-weight: 600;
}

.collection-tab-btn.active::after {
  transform: scaleX(1);
}

/* Panel displaying */
.collection-panel {
  display: none;
}

.collection-panel:not([hidden]) {
  display: block;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
}

.frame-card {
  background-color: var(--white);
  border: 1px solid var(--primary-border);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.frame-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.frame-visual {
  background-color: var(--accent-light);
  padding: 3rem 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  border-bottom: 1.5px solid var(--primary-border);
}

.frame-draw-svg {
  width: 65%;
  height: auto;
  display: block;
  transition: transform 0.6s ease-in-out;
}

.frame-card:hover .frame-draw-svg {
  transform: scale(1.08) rotate(1.5deg);
}

.frame-tag {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background-color: var(--primary);
  color: var(--white);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.3rem 0.8rem;
  font-weight: 500;
}

.frame-info {
  padding: 2rem;
  text-align: left;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.frame-info h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.frame-desc {
  font-size: 0.85rem;
  color: var(--neutral-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.frame-price {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--accent-dark);
  font-weight: 600;
}

/* ==========================================================================
   Guide Section (until-found Accordion)
   ========================================================================== */
.guide-section {
  background-color: var(--white);
}

.guide-accordion-group {
  max-width: 850px;
  margin: 0 auto;
}

.accordion-item {
  border: 1.5px solid var(--primary-border);
  margin-bottom: 1.5rem;
  border-radius: var(--border-radius-sm);
  background-color: var(--accent-light);
  overflow: hidden;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.accordion-item:hover {
  border-color: var(--accent);
}

.accordion-header {
  width: 100%;
  background: none;
  border: none;
  padding: 1.6rem 2rem;
  display: flex;
  align-items: center;
  text-align: left;
  cursor: pointer;
}

.q-badge {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--accent-dark);
  margin-right: 1.2rem;
  font-weight: 600;
}

.accordion-header h3 {
  font-size: 1.05rem;
  color: var(--primary);
  font-weight: 500;
  flex-grow: 1;
  padding-right: 1.5rem;
}

.toggle-icon {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent);
  font-weight: 400;
  transition: transform var(--transition-fast);
}

/* Content Panel */
.accordion-content {
  /* Default hides when until-found is stripped, browser overrides display */
  display: none;
}

.accordion-content:not([hidden]) {
  display: block;
}

.accordion-inner {
  padding: 0 2rem 2.2rem 4.5rem;
}

.accordion-inner p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--neutral-dark);
  margin-bottom: 1rem;
}

.accordion-inner ul {
  list-style: none;
  margin-bottom: 1.5rem;
  padding-left: 0.5rem;
}

.accordion-inner li {
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  position: relative;
  padding-left: 1.2rem;
  color: var(--neutral-muted);
}

.accordion-inner li::before {
  content: '▪';
  color: var(--accent);
  position: absolute;
  left: 0;
  top: -1px;
}

.recommend-box {
  background-color: var(--white);
  border: 1px solid var(--primary-border);
  border-left: 4px solid var(--accent);
  padding: 1.2rem;
  border-radius: var(--border-radius-sm);
  margin-top: 1.8rem;
}

.recommend-box h4 {
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 0.3rem;
  letter-spacing: 0.05em;
}

.recommend-box p {
  font-size: 0.85rem;
  color: var(--neutral-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* Active states via JS */
.accordion-item.active {
  background-color: var(--white);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.accordion-item.active .toggle-icon {
  transform: rotate(45deg);
}

/* ==========================================================================
   Access Section
   ========================================================================== */
.access-section {
  background-color: var(--primary-bg);
}

.access-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 5rem;
  align-items: center;
}

.access-info-pane h2 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.access-intro-text {
  color: var(--neutral-muted);
  margin-bottom: 2rem;
}

.access-details-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.access-details-list li {
  font-size: 0.95rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--primary-border);
}

.access-details-list strong {
  color: var(--primary);
  display: inline-block;
  width: 150px;
  font-weight: 500;
}

.time-block {
  display: block;
  padding-left: 150px;
  margin-top: 0.2rem;
}

.time-block:first-of-type {
  margin-top: -1.5rem;
}

.access-map-pane {
  background-color: var(--white);
  padding: 1rem;
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--primary-border);
}

.map-frame {
  position: relative;
  overflow: hidden;
}

.map-svg {
  width: 100%;
  height: auto;
  display: block;
}

.map-btn-overlay {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
}

/* ==========================================================================
   Booking Reservation Form (Dynamic Slot Selection)
   ========================================================================== */
.booking-section {
  background-color: var(--white);
}

.booking-card-wrapper {
  max-width: 900px;
  margin: 0 auto;
  background-color: var(--accent-light);
  border: 1px solid var(--primary-border);
  border-radius: var(--border-radius-sm);
  padding: 4rem;
  box-shadow: var(--shadow-sm);
}

.booking-step-block {
  margin-bottom: 3rem;
  border-bottom: 1.5px dashed var(--primary-border);
  padding-bottom: 3rem;
  position: relative;
}

.booking-step-block:last-of-type {
  border-bottom: none;
  padding-bottom: 1rem;
}

.step-num-tag {
  position: absolute;
  top: -1rem;
  left: 0;
  background-color: var(--accent);
  color: var(--primary);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  letter-spacing: 0.1em;
}

.form-fieldset {
  border: none;
}

.form-fieldset legend {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1.5rem;
  padding-top: 1rem;
  display: block;
}

/* Menu radio card grid */
.menu-selection-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.menu-radio-card {
  cursor: pointer;
}

.menu-radio-card input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.menu-card-inner {
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1.2rem;
  background-color: var(--white);
  border: 1.5px solid var(--primary-border);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  height: 100%;
}

.m-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.m-desc {
  font-size: 0.75rem;
  color: var(--neutral-muted);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.m-duration {
  font-family: var(--font-base);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent-dark);
}

.menu-radio-card:hover .menu-card-inner {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.menu-radio-card input:checked + .menu-card-inner {
  border-color: var(--primary);
  background-color: var(--primary-bg);
  box-shadow: var(--shadow-sm);
}

/* Step 2 Inputs */
.datetime-fields-group {
  padding-top: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

/* Dynamic Alert badge switching via :has() */
.duration-badge-box {
  background-color: var(--white);
  border: 1px solid var(--primary-border);
  padding: 1.5rem;
  border-radius: var(--border-radius-sm);
  min-height: 120px;
  display: flex;
  align-items: center;
}

.badge-item {
  display: none;
  animation: fade-in-scale 0.4s ease;
}

@keyframes fade-in-scale {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

.badge-item strong {
  display: block;
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 0.4rem;
}

.badge-item p {
  font-size: 0.75rem;
  color: var(--neutral-muted);
  line-height: 1.5;
}

/* :has() dynamic routing logic */
.booking-form:has(input[value="full"]:checked) .alert-full { display: block; }
.booking-form:has(input[value="frame_only"]:checked) .alert-frame { display: block; }
.booking-form:has(input[value="prescription_receive"]:checked) .alert-prescription { display: block; }

/* Step 3 Inputs Grid */
.patient-fields-grid {
  padding-top: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.full-width {
  grid-column: span 2;
}

/* Field styling */
.field-group {
  display: flex;
  flex-direction: column;
  position: relative;
}

.field-group label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.required {
  color: var(--error);
  font-size: 0.8rem;
  margin-left: 0.2rem;
  vertical-align: middle;
}

.input-wrapper {
  position: relative;
}

.input-wrapper input[type="text"],
.input-wrapper input[type="tel"],
.input-wrapper input[type="email"],
.input-wrapper input[type="datetime-local"],
.input-wrapper textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--primary-border);
  background-color: var(--white);
  border-radius: var(--border-radius-sm);
  color: var(--neutral-dark);
  transition: all var(--transition-fast);
}

.input-wrapper textarea {
  resize: vertical;
}

.input-wrapper input:focus,
.input-wrapper textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 42, 58, 0.04);
}

.help-text {
  font-size: 0.75rem;
  color: var(--neutral-muted);
  margin-top: 0.4rem;
  line-height: 1.4;
}

/* ==========================================================================
   CSS Form Validation using :has() & :user-invalid
   ========================================================================== */
.error-message {
  display: none;
  color: var(--error);
  font-size: 0.75rem;
  font-weight: 500;
  margin-top: 0.4rem;
}

/* User invalid states styling */
.field-group:has(:user-invalid) input,
.field-group:has(:user-invalid) textarea {
  border-color: var(--error);
  background-color: var(--error-bg);
}

.field-group:has(:user-invalid) .error-message {
  display: block;
}

.field-group:has(:user-invalid) label {
  color: var(--error);
}

/* Validation status icon */
.val-icon {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  display: none;
  pointer-events: none;
}

.field-group:has(:user-invalid) .val-icon {
  display: block;
}

.field-group:has(:user-invalid) .val-icon::after {
  content: '⚠️';
}

/* JS Fallback validation support classes */
.field-group.has-error input,
.field-group.has-error textarea {
  border-color: var(--error);
  background-color: var(--error-bg);
}
.field-group.has-error .error-message {
  display: block;
}
.field-group.has-error label {
  color: var(--error);
}

/* Submit area */
.form-submit-area {
  margin-top: 1rem;
}

.btn-submit {
  width: 100%;
  background-color: var(--primary);
  color: var(--white);
  font-size: 1rem;
  padding: 1.1rem 0;
  font-weight: 500;
}

.btn-submit:hover {
  background-color: var(--accent-dark);
  border-color: var(--accent-dark);
}

.btn-submit:disabled {
  background-color: var(--neutral-muted);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Spinner */
.spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: var(--white);
  animation: spin 0.8s linear infinite;
  margin-left: 0.5rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.btn-submit.loading .spinner {
  display: inline-block;
}

.btn-submit.loading .btn-text {
  opacity: 0.8;
}

/* Form success box */
.form-success-box {
  background-color: var(--primary-bg);
  border: 1px solid var(--accent);
  border-radius: var(--border-radius-sm);
  padding: 3rem;
  text-align: center;
  margin-top: 1rem;
  animation: fade-in-up var(--transition-normal);
}

.success-icon {
  width: 54px;
  height: 54px;
  background-color: var(--accent);
  color: var(--primary);
  border-radius: 50%;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem auto;
  box-shadow: 0 4px 16px rgba(197, 168, 128, 0.2);
}

.form-success-box h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.form-success-box p {
  font-size: 0.88rem;
  color: var(--neutral-dark);
  line-height: 1.75;
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Footer Section
   ========================================================================== */
.main-footer {
  background-color: var(--primary);
  color: var(--white);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--accent);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  text-align: center;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.footer-tagline {
  font-size: 0.9rem;
  color: var(--primary-border);
  margin-bottom: 2.5rem;
  letter-spacing: 0.05em;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 2.2rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--white);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--accent);
}

.footer-bottom {
  font-size: 0.78rem;
  color: var(--primary-border);
  opacity: 0.7;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 2rem;
}

/* ==========================================================================
   Scroll-driven Animation (Visual Scale & Fade-in)
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  @supports ((animation-timeline: view()) and (animation-range: entry)) {
    @keyframes megane-reveal {
      from {
        opacity: 0;
        transform: translateY(30px) scale(0.98);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    .scroll-trigger {
      animation: megane-reveal auto linear forwards;
      animation-timeline: view();
      animation-range: entry 5% entry 30%;
    }
  }
}

/* JS Fallback style */
.js-scroll-animate {
  opacity: 0;
  transform: translateY(20px) scale(0.98);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.js-scroll-animate.animated {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .hero-text-side {
    text-align: center;
  }
  
  .hero-text-side p {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-visual-side {
    height: 380px;
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
  }

  .philosophy-layout {
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }

  .showcase-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .frame-desc {
    margin-bottom: 1.2rem;
  }

  .access-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .hero-text-side h1 {
    font-size: 2.4rem;
  }
  
  .section-header h2 {
    font-size: 1.85rem;
  }
  
  .collection-tab-list {
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    border-bottom: none;
  }
  
  .collection-tab-btn {
    width: 100%;
    text-align: center;
    border-bottom: 1.5px solid var(--primary-border);
    padding: 0.8rem 0;
  }
  
  .collection-tab-btn::after {
    display: none;
  }

  .accordion-inner {
    padding: 0 1.5rem 1.8rem 1.5rem;
  }
  
  .accordion-header {
    padding: 1.2rem 1.5rem;
  }

  .menu-selection-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .datetime-fields-group {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .patient-fields-grid {
    grid-template-columns: 1fr;
  }
  
  .full-width {
    grid-column: span 1;
  }
  
  .booking-card-wrapper {
    padding: 2rem 1.5rem;
  }
  
  .time-block {
    padding-left: 0;
    margin-top: 0.2rem;
  }

  .time-block:first-of-type {
    margin-top: 0;
  }
}