/* ==========================================================================
   音楽教室 ソナタ - Core Stylesheet
   ========================================================================== */

/* --- Custom Properties (Design Tokens) --- */
:root {
  /* Classy, Studio Brand Colors */
  --color-primary: #1e3a8a;        /* Deep Cobalt / Royal Navy */
  --color-primary-light: #eff6ff;  /* Soft Blue Whisper */
  --color-primary-dark: #1e40af;   /* Strong Cobalt Blue */
  
  --color-accent-gold: #b45309;    /* Antique Gold / Amber Brown */
  --color-accent-gold-light: #fef3c7; /* Soft Gold Cream */
  --color-accent-gold-dark: #78350f; /* Dark Antique Gold */
  
  /* Neutral Color Palette */
  --color-bg-base: #faf9f6;        /* Warm Antique White */
  --color-bg-card: #ffffff;        /* Pure White */
  --color-bg-alt: #f1f0ea;         /* Soft Canvas Gray */
  
  --color-text-main: #1c1917;      /* Warm Charcoal */
  --color-text-muted: #57534e;     /* Medium Cocoa Gray */
  --color-text-light: #a8a29e;     /* Soft Ash Clay */
  
  --color-border: #e7e5e4;         /* Soft Border Gray */
  --color-error: #b91c1c;          /* Muted Crimson Red */
  --color-error-light: #fef2f2;    /* Soft Pink Mist */
  --color-success: #047857;        /* Forest Emerald */
  
  /* Typography */
  --font-family: 'Inter', 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  --font-serif: 'Noto Serif JP', 'Georgia', serif; /* Elegant serif for classical feel */
  
  /* Sizing, Radius & Animation */
  --container-width: 1200px;
  --header-height: 80px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition-normal: 0.35s cubic-bezier(0.25, 1, 0.5, 1);
  --transition-smooth: 0.6s cubic-bezier(0.25, 1, 0.5, 1);
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(28, 25, 22, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(28, 25, 22, 0.08), 0 2px 4px -1px rgba(28, 25, 22, 0.04);
  --shadow-lg: 0 16px 24px -4px rgba(28, 25, 22, 0.12), 0 8px 8px -4px rgba(28, 25, 22, 0.04);
  --shadow-glow-blue: 0 0 0 3px rgba(30, 58, 138, 0.18);
  --shadow-glow-gold: 0 0 0 3px rgba(180, 83, 9, 0.18);
}

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

html {
  font-family: var(--font-family);
  color: var(--color-text-main);
  background-color: var(--color-bg-base);
  line-height: 1.75;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
  outline: none;
}

/* Skip Link for accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-accent-gold);
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  z-index: 9999;
  transition: top 0.2s ease;
  font-weight: 700;
  box-shadow: var(--shadow-lg);
}
.skip-link:focus {
  top: 20px;
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* Focus Ring Policy */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-accent-gold);
  outline-offset: 2px;
}

/* Visually Hidden Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Reusable Components (Buttons) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm); /* Classy square corner feel */
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  letter-spacing: 0.05em;
}

.btn-primary {
  background-color: var(--color-accent-gold);
  color: #ffffff;
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-accent-gold-dark);
  box-shadow: var(--shadow-glow-gold);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--color-accent-gold);
  color: var(--color-accent-gold);
  transform: translateY(-2px);
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-lg {
  padding: 1.1rem 2.75rem;
  font-size: 1.05rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(250, 249, 246, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: background-color var(--transition-normal);
}

.header-container {
  max-width: var(--container-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo a {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-primary);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
}
.logo-icon {
  color: var(--color-accent-gold);
}
.brand-sub {
  color: var(--color-accent-gold);
}

/* Navigation Menu */
.nav-menu {
  display: flex;
  align-items: center;
}

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

.nav-link {
  font-weight: 600;
  font-size: 0.925rem;
  color: var(--color-text-muted);
  position: relative;
  padding: 0.5rem 0;
  transition: color var(--transition-normal);
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent-gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}
.nav-link:hover {
  color: var(--color-accent-gold);
}
.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-btn {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 0.6rem 1.35rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  transition: all var(--transition-normal);
}
.nav-btn:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-blue);
}

/* Mobile Toggle Hamburger */
.menu-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  cursor: pointer;
  z-index: 101;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
}

.hamburger {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-main);
  position: relative;
  transition: background-color var(--transition-normal);
}
.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-main);
  left: 0;
  transition: transform var(--transition-normal), top var(--transition-normal);
}
.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* Menu open state for hamburger */
.menu-toggle[aria-expanded="true"] .hamburger {
  background-color: transparent;
}
.menu-toggle[aria-expanded="true"] .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  max-width: var(--container-width);
  margin: calc(var(--header-height) + 2rem) auto 4rem;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 4.5rem;
  min-height: calc(80vh - var(--header-height));
}

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

.hero-tagline {
  font-size: 0.925rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  border-left: 3px solid var(--color-accent-gold);
  padding-left: 0.75rem;
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-text-main);
  margin-bottom: 1.75rem;
}

.hero-desc {
  font-size: 1.075rem;
  color: var(--color-text-muted);
  margin-bottom: 2.75rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* Hero Image frame decoration */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-img-frame {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 10px solid #ffffff;
  position: relative;
}
.hero-img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid var(--color-border);
  pointer-events: none;
}

.hero-img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1;
  transition: transform var(--transition-smooth);
}
.hero-img:hover {
  transform: scale(1.02);
}

/* ==========================================================================
   Section Common Layout
   ========================================================================== */
section {
  padding: 6.5rem 0;
}

.section-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-subtitle {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent-gold);
  margin-bottom: 0.5rem;
  display: inline-block;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 3.2vw, 2.35rem);
  font-weight: 600;
  color: var(--color-text-main);
  position: relative;
}

/* ==========================================================================
   About Section (3 Columns)
   ========================================================================== */
.about-section {
  background-color: var(--color-bg-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.about-card {
  background-color: var(--color-bg-card);
  padding: 3rem 2.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  border: 1px solid var(--color-border);
}
.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-gold);
}

.about-icon-wrapper {
  color: var(--color-accent-gold);
  background-color: var(--color-accent-gold-light);
  width: 68px;
  height: 68px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2rem;
}

.about-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--color-text-main);
}
.about-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ==========================================================================
   Courses Section
   ========================================================================== */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.course-card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}
.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.course-img-wrapper {
  width: 100%;
  height: 230px;
  overflow: hidden;
  position: relative;
}
.course-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}
.course-card:hover .course-img {
  transform: scale(1.03);
}

.course-body {
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.course-tag {
  font-size: 0.775rem;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  align-self: flex-start;
  margin-bottom: 1rem;
}

.course-body h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-main);
}

.course-price {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  margin-bottom: 1.25rem;
}

.course-text {
  color: var(--color-text-muted);
  font-size: 0.925rem;
  line-height: 1.65;
}

/* ==========================================================================
   Instructors Section
   ========================================================================== */
.instructors-section {
  background-color: var(--color-primary-light);
  background-image: radial-gradient(circle at 10% 20%, rgba(239, 246, 255, 0.4) 0%, rgba(250, 249, 246, 0) 80%);
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3.5rem;
  max-width: 960px;
  margin: 0 auto;
}

.instructor-card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 3rem 2.5rem;
  box-shadow: var(--shadow-md);
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  border: 1px solid var(--color-border);
}

.instructor-avatar-wrap {
  flex-shrink: 0;
}
.instructor-avatar-svg {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  display: block;
}

.instructor-info h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.instructor-role {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  margin-bottom: 1.25rem;
}

.instructor-bio {
  color: var(--color-text-muted);
  font-size: 0.925rem;
  line-height: 1.7;
}

/* ==========================================================================
   Simulator Section (Tuition Fee Calculator)
   ========================================================================== */
.simulator-section {
  background-color: var(--color-bg-alt);
}

.simulator-intro {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-top: 0.75rem;
}

.simulator-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.75rem;
  align-items: stretch;
}

.sim-card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 3rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.sim-fieldset {
  border: none;
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

.sim-group {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.sim-group label,
.sim-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text-main);
}

/* Custom Select Dropdowns */
select {
  width: 100%;
  min-height: 52px;
  padding: 0 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-base);
  font-size: 1rem;
  color: var(--color-text-main);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24'%3E%3Cpath fill='%2357534e' d='M7.41,8.58L12,13.17L16.59,8.58L18,10L12,16L6,10L7.41,8.58Z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1.25rem;
  transition: all var(--transition-normal);
}
select:hover {
  border-color: var(--color-text-light);
}
select:focus-visible {
  border-color: var(--color-accent-gold);
}

/* Radio Layout cards for Simulator */
.sim-radio-horizontal {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.radio-label-card {
  display: block;
  position: relative;
  cursor: pointer;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-base);
  transition: all var(--transition-normal);
}
.radio-label-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio-inner {
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.radio-inner span:first-child {
  font-weight: 700;
  font-size: 0.95rem;
}
.radio-subtext {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.radio-label-card:hover {
  border-color: var(--color-text-light);
}

/* Style selected state via :has() */
.radio-label-card:has(input:checked) {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}
.radio-label-card:has(input:checked) .radio-inner span:first-child {
  color: var(--color-primary-dark);
}

/* Checkbox styling */
.checkbox-container {
  display: flex;
  align-items: center;
  position: relative;
  cursor: pointer;
  user-select: none;
}
.checkbox-container input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.checkbox-container:has(input:checked) .checkbox-label {
  color: var(--color-text-main);
}

.checkbox-label::before {
  content: "";
  display: inline-block;
  width: 1.35rem;
  height: 1.35rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-base);
  transition: all var(--transition-normal);
  flex-shrink: 0;
}

.checkbox-container input:checked + .checkbox-label::before {
  background-color: var(--color-accent-gold);
  border-color: var(--color-accent-gold);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24'%3E%3Cpath fill='%23ffffff' d='M9,16.17L4.83,12L3.41,13.41L9,19L21,7L19.59,5.59L9,16.17Z'/%3E%3C/svg%3E");
  background-size: 0.9rem;
  background-position: center;
  background-repeat: no-repeat;
}

.checkbox-container input:focus-visible + .checkbox-label::before {
  outline: 3px solid var(--color-accent-gold);
  outline-offset: 2px;
}

/* Result Card Side */
.sim-result-side {
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.sim-result-side h3 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 600;
  margin-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 1rem;
}

.result-breakdown {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  flex-grow: 1;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  color: var(--color-primary-light);
}
.breakdown-row span:last-child {
  color: #ffffff;
  font-weight: 700;
}

.sim-divider {
  border: 0;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.15);
  margin: 1.25rem 0;
}

.final-total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}
.final-total-row span:first-child {
  font-size: 1.05rem;
  font-weight: 700;
}

.total-price-display {
  font-family: var(--font-serif);
  font-size: 2.35rem;
  font-weight: 700;
  color: #ffffff;
  text-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.sim-result-actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.sim-result-actions .btn {
  background-color: var(--color-accent-gold);
  color: #ffffff;
}
.sim-result-actions .btn:hover {
  background-color: var(--color-accent-gold-dark);
}

.sim-disclaimer {
  font-size: 0.8rem;
  color: var(--color-primary-light);
  line-height: 1.4;
}

/* ==========================================================================
   Booking Form Section
   ========================================================================== */
.reserve-section {
  background-color: var(--color-bg-base);
}

.section-header-center {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3.5rem;
}
.reserve-intro {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-top: 0.75rem;
}

/* Status Assist Banner */
.status-assist-banner {
  max-width: 760px;
  margin: 0 auto 2.25rem;
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.4rem;
  box-shadow: var(--shadow-sm);
  background-color: var(--color-accent-gold-light);
  border: 1px solid rgba(180, 83, 9, 0.25);
  color: var(--color-accent-gold-dark);
}

.banner-content-inner {
  display: flex;
  gap: 0.85rem;
  align-items: center;
}
.alert-icon-svg {
  flex-shrink: 0;
  color: var(--color-accent-gold);
}
.status-assist-banner p {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.5;
}

/* Form Styles */
.form-outer-wrapper {
  max-width: 760px;
  margin: 0 auto;
  background-color: var(--color-bg-card);
  padding: 3.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.form-section-fieldset {
  border: none;
  margin-bottom: 2.75rem;
}
.form-section-fieldset legend {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 0.5rem;
  width: 100%;
}

.form-grid-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
  margin-bottom: 1.75rem;
}

.form-group-unit {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
}

.form-group-unit label {
  font-size: 0.925rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.req-star {
  color: var(--color-error);
  font-size: 0.9rem;
  margin-left: 0.2rem;
}

/* Input Fields Style */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
textarea {
  width: 100%;
  min-height: 52px;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-base);
  font-size: 1rem;
  color: var(--color-text-main);
  transition: all var(--transition-normal);
}

textarea {
  resize: vertical;
}

input:hover,
textarea:hover {
  border-color: var(--color-text-light);
}

input:focus,
textarea:focus {
  border-color: var(--color-primary);
  background-color: var(--color-bg-card);
  box-shadow: var(--shadow-glow-blue);
}

.field-hint-text {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.form-error-msg {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-error);
  display: none;
  margin-top: 0.25rem;
}

/* live form validation using :user-invalid and :has() */
input:user-invalid,
select:user-invalid {
  border-color: var(--color-error);
  background-color: var(--color-error-light);
}

.form-group-unit:has(:user-invalid) .form-error-msg {
  display: block;
}

/* Conditional Kids Fields animation */
.conditional-fields {
  animation: slide-reveal 0.4s cubic-bezier(0.25, 1, 0.5, 1) forwards;
}

@keyframes slide-reveal {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.form-btn-row {
  display: flex;
  justify-content: center;
  border-top: 1px solid var(--color-border);
  padding-top: 2.75rem;
  margin-top: 2rem;
}

/* ==========================================================================
   FAQ Section (Accordions)
   ========================================================================== */
.faq-section {
  background-color: var(--color-bg-alt);
}

.faq-accordion-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.sonata-accordion {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: all var(--transition-normal);
}
.sonata-accordion:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-text-light);
}
.sonata-accordion[open] {
  border-color: var(--color-accent-gold);
}

.accordion-summary {
  padding: 1.5rem;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  user-select: none;
}
.accordion-summary::-webkit-details-marker {
  display: none;
}

.accordion-icon-box {
  width: 22px;
  height: 22px;
  position: relative;
  flex-shrink: 0;
  transition: transform var(--transition-normal);
}
.accordion-icon-box::before,
.accordion-icon-box::after {
  content: "";
  position: absolute;
  background-color: var(--color-text-muted);
  transition: all var(--transition-normal);
}
/* Horizontal */
.accordion-icon-box::before {
  width: 14px;
  height: 2px;
  top: 10px;
  left: 4px;
}
/* Vertical */
.accordion-icon-box::after {
  width: 2px;
  height: 14px;
  top: 4px;
  left: 10px;
}

.sonata-accordion[open] .accordion-summary .accordion-icon-box {
  transform: rotate(45deg);
}
.sonata-accordion[open] .accordion-summary .accordion-icon-box::before,
.sonata-accordion[open] .accordion-summary .accordion-icon-box::after {
  background-color: var(--color-accent-gold);
}

/* Content Area transition */
.accordion-content-box {
  padding: 0 1.5rem 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid transparent;
  animation: fade-slide-reveal 0.35s ease-out forwards;
}
.sonata-accordion[open] .accordion-content-box {
  border-top-color: var(--color-border);
}

@keyframes fade-slide-reveal {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: #1c1917; /* Slate Black */
  color: #ffffff;
  padding: 5.5rem 0 2rem;
  border-top: 4px solid var(--color-accent-gold);
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr 1fr;
  gap: 4.5rem;
  margin-bottom: 4.5rem;
}

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-accent-gold-light);
  margin-bottom: 1.75rem;
}
.footer-brand-logo .logo-icon {
  color: var(--color-accent-gold);
}

.footer-postal-addr {
  font-size: 0.95rem;
  color: #d6d3d1;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.footer-tel {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.footer-hours {
  font-size: 0.85rem;
  color: #a8a29e;
  line-height: 1.6;
}

.footer-nav-links h4,
.footer-map-container h4 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: #ffffff;
  margin-bottom: 1.75rem;
  position: relative;
  padding-bottom: 0.5rem;
}
.footer-nav-links h4::after,
.footer-map-container h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 45px;
  height: 2px;
  background-color: var(--color-accent-gold);
}

.footer-nav-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.footer-nav-links a {
  font-size: 0.95rem;
  color: #d6d3d1;
  transition: all var(--transition-normal);
}
.footer-nav-links a:hover {
  color: var(--color-accent-gold-light);
  padding-left: 5px;
}

/* Access Map canvas */
.map-inner-canvas {
  width: 100%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: 0 12px 24px rgba(0,0,0,0.3);
  border: 1px solid #292524;
}
.map-svg-element {
  width: 100%;
  height: auto;
  display: block;
}

.footer-bottom-info {
  border-top: 1px solid #292524;
  padding-top: 2rem;
  text-align: center;
}
.footer-bottom-info p {
  font-size: 0.85rem;
  color: #78716c;
}

/* ==========================================================================
   Completion Dialog (Modal Popup)
   ========================================================================== */
.completion-dialog {
  border: none;
  border-radius: var(--radius-md);
  padding: 0;
  box-shadow: var(--shadow-lg);
  max-width: 580px;
  width: 90%;
  margin: auto;
  overflow: hidden;
  background-color: var(--color-bg-card);
}

.completion-dialog::backdrop {
  background-color: rgba(28, 25, 22, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: fade-in-backdrop 0.3s ease-out;
}

.dialog-content-inner {
  padding: 3.5rem 2.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  animation: pop-up-modal 0.45s cubic-bezier(0.25, 1, 0.5, 1);
}

.dialog-success-icon-wrap {
  width: 80px;
  height: 80px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.75rem;
}

.dialog-content-inner h2 {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.dialog-message-body {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

/* Summary breakdown inside modal */
.receipt-summary-box {
  width: 100%;
  background-color: var(--color-bg-base);
  border-radius: var(--radius-sm);
  padding: 1.75rem;
  margin-bottom: 2.25rem;
  text-align: left;
  border: 1px solid var(--color-border);
}
.receipt-summary-box h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.summary-dl-list {
  display: grid;
  grid-template-columns: auto 1fr;
  row-gap: 0.85rem;
  column-gap: 1.5rem;
  font-size: 0.9rem;
}
.summary-dl-list dt {
  font-weight: 700;
  color: var(--color-text-muted);
}
.summary-dl-list dd {
  color: var(--color-text-main);
}

.dialog-close-row {
  width: 100%;
  display: flex;
  justify-content: center;
}

@keyframes fade-in-backdrop {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pop-up-modal {
  from { opacity: 0; transform: scale(0.9) translateY(24px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 3.5rem;
    text-align: center;
    margin-top: calc(var(--header-height) + 1rem);
  }
  .hero-content {
    align-items: center;
  }
  .hero-actions {
    justify-content: center;
  }
  
  .about-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .courses-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .instructors-grid {
    grid-template-columns: 1fr;
    max-width: 600px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 70px;
  }
  
  section {
    padding: 4.5rem 0;
  }
  
  /* Mobile Navigation active Drawer */
  .menu-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-bg-base);
    padding: 3rem 1.5rem;
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: 99;
    flex-direction: column;
    justify-content: flex-start;
  }
  
  .nav-menu.active {
    transform: translateX(0);
  }
  
  .nav-list {
    flex-direction: column;
    gap: 2rem;
    width: 100%;
    text-align: center;
  }
  
  .nav-link {
    font-size: 1.15rem;
    display: block;
    width: 100%;
  }
  
  .nav-btn {
    display: inline-block;
    width: 80%;
    font-size: 1.1rem;
    padding: 0.85rem;
  }
  
  /* Grid items layout stacked */
  .about-grid,
  .courses-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .simulator-layout {
    grid-template-columns: 1fr;
  }
  
  .form-outer-wrapper {
    padding: 2.25rem 1.5rem;
  }
  
  .form-grid-columns {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    margin-bottom: 0;
  }
  .form-group-unit {
    margin-bottom: 1.25rem;
  }
  
  .sim-radio-horizontal {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }
  
  .instructor-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}