/* =====================================================
   久留米工業大学 LP - CSS Design System
   ===================================================== */

/* -----------------------------------------------------
   1. CSS Variables (Design Tokens)
   ----------------------------------------------------- */
:root {
  /* Asobi Gym Inspired Colors */
  --color-primary: #00C853;
  --color-primary-light: #00E676;
  --color-primary-pale: #E8F5E9;
  --color-accent: #FF6B35;
  --color-accent-yellow: #FFB300;
  --color-accent-blue: #2196F3;
  --color-background: #FFFEF7;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-secondary: #555555;
  --color-bg-cream: #FFFEF7;
  
  /* Legacy Colors (for backward compatibility) */
  --color-primary-dark: #00B248;
  --color-white: #FFFFFF;
  --color-black: #1A1A1A;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E5E5E5;
  --color-gray-300: #D4D4D4;
  --color-gray-500: #737373;
  --color-gray-700: #404040;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  /* Typography */
  --font-family-base: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family: var(--font-family-base);
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --font-weight-black: 900;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Header/Footer specific */
  --header-height-mobile: 64px;
  --header-height-desktop: 80px;
  --header-bg: var(--color-surface);
  --header-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-normal: 0.3s ease;
  
  /* Z-index */
  --z-header: 100;
  --z-overlay: 99;
  
  /* Container */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-6);
}

/* -----------------------------------------------------
   2. CSS Reset
   ----------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100%;
  overflow-x: hidden;
}

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

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

button {
  cursor: pointer;
  background: none;
  border: none;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: inherit;
  font-weight: inherit;
}

p {
  margin: 0;
}

/* -----------------------------------------------------
   3. Base Styles
   ----------------------------------------------------- */

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Selection styles */
::selection {
  background-color: var(--color-primary-pale);
  color: var(--color-primary);
}

/* -----------------------------------------------------
   4. Heading Styles
   ----------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-black);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-black);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
}

h4 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
}

h5 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

h6 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

/* -----------------------------------------------------
   5. Link Styles
   ----------------------------------------------------- */
a {
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-light);
}

a:active {
  color: var(--color-primary);
}

/* -----------------------------------------------------
   6. Utility Classes
   ----------------------------------------------------- */

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

/* Section */
.section {
  padding-top: var(--spacing-16);
  padding-bottom: var(--spacing-16);
}

.section-sm {
  padding-top: var(--spacing-12);
  padding-bottom: var(--spacing-12);
}

.section-lg {
  padding-top: var(--spacing-24);
  padding-bottom: var(--spacing-24);
}

/* Background colors */
.bg-primary {
  background-color: var(--color-primary);
}

.bg-primary-pale {
  background-color: var(--color-primary-pale);
}

.bg-surface {
  background-color: var(--color-surface);
}

.bg-background {
  background-color: var(--color-background);
}

/* Asobi Gym Inspired Backgrounds */
.bg-cream {
  background-color: var(--color-bg-cream);
}

.bg-gradient-green {
  background: linear-gradient(135deg, #00C853 0%, #00B248 50%, #00E676 100%);
}

.bg-gradient-green-soft {
  background: linear-gradient(180deg, #E8F5E9 0%, #FFFEF7 100%);
}

.bg-gradient-warm {
  background: linear-gradient(135deg, #FFFEF7 0%, #FFF8E1 50%, #FFF3E0 100%);
}

.bg-alternate-white {
  background-color: #FFFFFF;
}

.bg-alternate-cream {
  background-color: #FFFEF7;
}

/* Text colors */
.text-primary {
  color: var(--color-primary);
}

.text-accent {
  color: var(--color-accent);
}

.text-secondary {
  color: var(--color-text-secondary);
}

.text-white {
  color: var(--color-surface);
}

/* -----------------------------------------------------
   7. Button Components
   ----------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Primary Button - Asobi Gym Green */
.btn-primary {
  background: linear-gradient(135deg, #00C853 0%, #00B248 100%);
  color: var(--color-surface);
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(0, 200, 83, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #00E676 0%, #00C853 100%);
  color: var(--color-surface);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 200, 83, 0.45);
}

.btn-primary:active {
  background: linear-gradient(135deg, #00B248 0%, #00C853 100%);
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(0, 200, 83, 0.35);
}

/* Secondary Button */
.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary-pale);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* Accent Button - Asobi Gym Orange */
.btn-accent {
  background: linear-gradient(135deg, #FF6B35 0%, #FF8A65 100%);
  color: var(--color-surface);
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #FF8A65 0%, #FF6B35 100%);
  border-color: transparent;
  color: var(--color-surface);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.45);
}

.btn-accent:active {
  background: linear-gradient(135deg, #E55A2B 0%, #FF6B35 100%);
  transform: translateY(0);
}

/* Accent Yellow Button */
.btn-accent-yellow {
  background: linear-gradient(135deg, #FFB300 0%, #FFCA28 100%);
  color: #1A1A1A;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(255, 179, 0, 0.35);
}

.btn-accent-yellow:hover {
  background: linear-gradient(135deg, #FFCA28 0%, #FFB300 100%);
  color: #1A1A1A;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 179, 0, 0.45);
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

/* -----------------------------------------------------
   8. Text Utilities
   ----------------------------------------------------- */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.font-medium {
  font-weight: var(--font-weight-medium);
}

.font-bold {
  font-weight: var(--font-weight-bold);
}

.font-black {
  font-weight: var(--font-weight-black);
}

/* -----------------------------------------------------
   9. Spacing Utilities
   ----------------------------------------------------- */
.mb-1 { margin-bottom: var(--spacing-1); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }
.mb-8 { margin-bottom: var(--spacing-8); }

.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); }

/* =====================================================
   Hero Section - Asobi Gym Inspired Design
   ===================================================== */

.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, #FAFAFA 0%, #F0F0F0 100%);
  padding-top: var(--header-height-mobile);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.hero .container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 1;
}

/* Background Decorations */
.hero__bg-decoration {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero__bg-circle {
  position: absolute;
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}

.hero__bg-circle--1 {
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 200, 83, 0.15) 0%, rgba(0, 200, 83, 0.05) 50%, transparent 70%);
  top: -300px;
  right: -200px;
  animation-delay: 0s;
}

.hero__bg-circle--2 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 200, 83, 0.12) 0%, transparent 60%);
  bottom: -200px;
  left: -150px;
  animation-delay: -2s;
}

.hero__bg-circle--3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 200, 83, 0.08) 0%, transparent 50%);
  top: 40%;
  left: 20%;
  animation-delay: -4s;
}

.hero__bg-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 200, 83, 0.03) 100%);
  border-radius: 100% 100% 0 0 / 100px;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.02); }
}

/* Hero Content */
.hero__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
  align-items: center;
  padding: var(--spacing-8) 0;
  position: relative;
}

/* Typography Section */
.hero__typography {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-6);
  position: relative;
  z-index: 2;
}

/* Badge */
.hero__badge-wrapper {
  margin-bottom: var(--spacing-2);
}

.hero__badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(135deg, #00C853 0%, #00B248 100%);
  color: white;
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: 16px;
  box-shadow: 
    0 8px 24px rgba(0, 200, 83, 0.35),
    0 4px 8px rgba(0, 200, 83, 0.2);
  position: relative;
  overflow: hidden;
}

.hero__badge::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  50%, 100% { left: 100%; }
}

.hero__badge-year {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.15em;
  opacity: 0.9;
  text-transform: uppercase;
}

.hero__badge-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-black);
  letter-spacing: 0.05em;
  margin-top: 2px;
}

/* Main Title */
.hero__main-title {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero__title-line {
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  font-weight: var(--font-weight-black);
  color: var(--color-text);
  display: block;
}

.hero__title-line--highlight {
  color: #00C853;
  font-size: clamp(3rem, 10vw, 6.5rem);
  position: relative;
  display: inline-block;
}

.hero__title-line--highlight::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 0;
  width: 100%;
  height: 16px;
  background: linear-gradient(90deg, rgba(0, 200, 83, 0.3) 0%, rgba(0, 200, 83, 0.1) 100%);
  border-radius: 8px;
  z-index: -1;
}

/* Catchphrase */
.hero__catchphrase {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: var(--spacing-4) 0;
}

/* CTA Button */
.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-3);
  background: linear-gradient(135deg, #00C853 0%, #00B248 100%);
  color: white;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  padding: var(--spacing-4) var(--spacing-8);
  border-radius: 50px;
  text-decoration: none;
  box-shadow: 
    0 8px 24px rgba(0, 200, 83, 0.35),
    0 4px 8px rgba(0, 200, 83, 0.2);
  transition: all 0.3s ease;
  margin-top: var(--spacing-4);
}

.hero__cta:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 12px 32px rgba(0, 200, 83, 0.4),
    0 6px 12px rgba(0, 200, 83, 0.25);
  color: white;
}

.hero__cta-arrow {
  transition: transform 0.3s ease;
}

.hero__cta:hover .hero__cta-arrow {
  transform: translateX(4px);
}

/* Visual Section */
.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-6);
}

.hero__image-frame {
  position: relative;
  width: 100%;
  max-width: 480px;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 
    0 32px 64px rgba(0, 0, 0, 0.15),
    0 16px 32px rgba(0, 0, 0, 0.1);
  transform: rotate(-2deg);
  transition: transform 0.4s ease;
}

.hero__image-frame:hover {
  transform: rotate(0deg) scale(1.02);
}

.hero__image-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 4px solid white;
  border-radius: 24px;
  z-index: 2;
  pointer-events: none;
}

.hero__image {
  width: 100%;
  height: auto;
  aspect-ratio: 7/9;
  object-fit: cover;
  display: block;
}

/* Floating Elements */
.hero__floating {
  position: absolute;
  background: white;
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: 12px;
  box-shadow: 
    0 8px 24px rgba(0, 0, 0, 0.1),
    0 2px 8px rgba(0, 0, 0, 0.05);
  animation: float-element 4s ease-in-out infinite;
}

.hero__floating-text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  white-space: nowrap;
}

.hero__floating--1 {
  top: 10%;
  right: 5%;
  animation-delay: 0s;
}

.hero__floating--2 {
  bottom: 25%;
  left: 0%;
  animation-delay: -1.3s;
}

.hero__floating--3 {
  bottom: 10%;
  right: 10%;
  animation-delay: -2.6s;
}

@keyframes float-element {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Scroll Indicator - Modern Design */
.hero__scroll {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-3);
  padding-bottom: var(--spacing-8);
  margin-top: auto;
  position: relative;
}

.hero__scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(180deg, transparent 0%, #00C853 50%, transparent 100%);
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0%, 100% { 
    opacity: 0.3;
    transform: scaleY(0.5);
  }
  50% { 
    opacity: 1;
    transform: scaleY(1);
  }
}

.hero__scroll-text {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: #00C853;
  letter-spacing: 0.2em;
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.hero__scroll-mouse {
  width: 28px;
  height: 44px;
  border: 2px solid #00C853;
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
  margin-top: var(--spacing-2);
}

.hero__scroll-wheel {
  width: 4px;
  height: 8px;
  background: #00C853;
  border-radius: 2px;
  animation: scroll-wheel 2s ease-in-out infinite;
}

@keyframes scroll-wheel {
  0%, 100% { 
    opacity: 1;
    transform: translateY(0);
  }
  50% { 
    opacity: 0.3;
    transform: translateY(12px);
  }
}

/* Hero Responsive */
@media screen and (min-width: 768px) {
  .hero {
    padding-top: var(--header-height-desktop);
  }

  .hero__content {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    padding: var(--spacing-12) 0;
  }

  .hero__typography {
    gap: var(--spacing-8);
  }

  .hero__bg-circle--1 {
    width: 1000px;
    height: 1000px;
    top: -400px;
    right: -300px;
  }

  .hero__floating--1 {
    top: 15%;
    right: -10%;
  }

  .hero__floating--2 {
    bottom: 30%;
    left: -15%;
  }

  .hero__floating--3 {
    bottom: 15%;
    right: 0%;
  }
}

@media screen and (min-width: 1024px) {
  .hero__content {
    gap: var(--spacing-16);
    padding: var(--spacing-16) 0;
  }

  .hero__image-frame {
    max-width: 520px;
  }

  .hero__floating-text {
    font-size: var(--font-size-base);
  }
}

/* =====================================================
   Legacy Components (Header/Footer from previous version)
   ===================================================== */

/* -------------------------------------------
   Header
   ------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height-mobile);
  background-color: var(--header-bg);
  box-shadow: var(--header-shadow);
  z-index: var(--z-header);
  transition: transform var(--transition-normal);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.header__logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.header__logo:hover {
  color: var(--color-primary-dark);
}

.header__cta {
  display: none;
}

.header__cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
  border: none;
}

.header__cta-button:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
}

.header__cta-button:active {
  transform: translateY(0);
}

/* Hamburger Menu */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: calc(var(--z-header) + 1);
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  margin: 3px 0;
}

.hamburger.is-active .hamburger__line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger.is-active .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger.is-active .hamburger__line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu Overlay */
.mobile-menu {
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  padding: 40px 24px;
}

.mobile-menu.is-active {
  transform: translateX(0);
}

.mobile-menu__cta {
  margin-top: auto;
}

.mobile-menu__cta-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 16px 24px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  transition: background-color var(--transition-fast);
}

.mobile-menu__cta-button:hover {
  background-color: var(--color-primary-dark);
}

/* Mobile Menu Navigation */
.mobile-menu__nav {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-menu__list {
  list-style: none;
  padding: 0;
  margin: 0;
  width: 100%;
  max-width: 300px;
}

.mobile-menu__item {
  margin-bottom: 8px;
}

.mobile-menu__link {
  display: block;
  padding: 16px 24px;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  text-align: center;
  border-radius: 12px;
  transition: all 0.3s ease;
}

.mobile-menu__link:hover {
  background-color: var(--color-primary-pale);
  color: var(--color-primary);
}

/* -------------------------------------------
   Footer
   ------------------------------------------- */
.footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 48px 0 24px;
}

.footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.footer__content {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.footer__brand {
  text-align: center;
}

.footer__logo {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.footer__tagline {
  font-size: 14px;
  opacity: 0.9;
}

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer__contact-title {
  font-size: 14px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
  opacity: 0.8;
}

.footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: center;
}

.footer__contact-label {
  font-size: 12px;
  font-weight: 500;
  opacity: 0.7;
}

.footer__contact-value {
  font-size: 14px;
  font-weight: 400;
}

.footer__contact-value a {
  color: var(--color-white);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.footer__contact-value a:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.footer__bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
}

.footer__copyright {
  font-size: 12px;
  opacity: 0.8;
}

/* -------------------------------------------
   Responsive - Tablet & Desktop
   ------------------------------------------- */
@media screen and (min-width: 768px) {
  .header {
    height: var(--header-height-desktop);
  }
  
  .header__inner {
    padding: 0 24px;
  }
  
  .header__logo {
    font-size: 22px;
  }
  
  .header__cta {
    display: block;
  }
  
  .hamburger {
    display: none;
  }
  
  .mobile-menu {
    display: none;
  }
  
  .footer {
    padding: 64px 0 32px;
  }
  
  .footer__inner {
    padding: 0 24px;
  }
  
  .footer__content {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 48px;
  }
  
  .footer__brand {
    text-align: left;
    flex: 1;
  }
  
  .footer__logo {
    font-size: 24px;
  }
  
  .footer__contact {
    flex: 1;
    gap: 12px;
  }
  
  .footer__contact-title {
    text-align: left;
    margin-bottom: 12px;
  }
  
  .footer__contact-item {
    text-align: left;
    flex-direction: row;
    gap: 12px;
  }
  
  .footer__contact-label {
    min-width: 60px;
  }
  
  .footer__bottom {
    margin-top: 48px;
  }
}

@media screen and (min-width: 1024px) {
  .header__inner,
  .footer__inner {
    padding: 0 32px;
  }
}

/* -----------------------------------------------------
   10. Course Card Components - Asobi Gym Inspired
   ----------------------------------------------------- */

/* コースグリッド */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
}

/* コースカードベース - 大きく丸みを帯びたモダンデザイン */
.course-card {
  position: relative;
  background: var(--color-surface);
  border-radius: 32px;
  box-shadow: 
    0 8px 32px rgba(0, 200, 83, 0.08),
    0 2px 8px rgba(0, 0, 0, 0.04);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  border: 1px solid rgba(0, 200, 83, 0.06);
}

.course-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 
    0 24px 48px rgba(0, 200, 83, 0.15),
    0 8px 16px rgba(0, 0, 0, 0.08);
}

/* カード画像コンテナ - 円形フレーム */
.course-card__image-wrapper {
  position: relative;
  padding: 1.5rem 1.5rem 0;
  display: flex;
  justify-content: center;
}

/* カード画像 - 円形 */
.course-card__image {
  width: 160px;
  height: 160px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--color-surface);
  box-shadow: 
    0 8px 24px rgba(0, 200, 83, 0.2),
    0 4px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.4s ease;
}

.course-card:hover .course-card__image {
  transform: scale(1.05);
  box-shadow: 
    0 12px 32px rgba(0, 200, 83, 0.3),
    0 6px 12px rgba(0, 0, 0, 0.15);
}

/* 画像周りの装飾リング */
.course-card__image-ring {
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 3px dashed var(--color-primary);
  opacity: 0.3;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.4s ease;
  pointer-events: none;
}

.course-card:hover .course-card__image-ring {
  transform: translate(-50%, -50%) rotate(180deg);
  opacity: 0.5;
}

/* カードコンテンツ */
.course-card__content {
  padding: 1.5rem 2rem 2rem;
  text-align: center;
}

.course-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: 0.75rem;
  color: var(--color-text);
  transition: color 0.3s ease;
}

.course-card:hover .course-card__title {
  color: var(--color-primary);
}

.course-card__description {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

/* バッジ - 目立つ右上配置 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.badge--new {
  background: linear-gradient(135deg, #FF6B35 0%, #FF8A65 100%);
  color: white;
}

.badge--renamed {
  background: linear-gradient(135deg, #FFB300 0%, #FFCA28 100%);
  color: #1A1A1A;
}

.badge--merged {
  background: linear-gradient(135deg, #00C853 0%, #00E676 100%);
  color: white;
}

.course-card .badge {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 2;
  animation: badge-float 3s ease-in-out infinite;
}

@keyframes badge-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* カテゴリ別カラー */
.course-card--green .course-card__title {
  color: var(--color-primary);
}

.course-card--blue .course-card__title {
  color: var(--color-accent-blue);
}

.course-card--red .course-card__title {
  color: var(--color-accent);
}

/* スキルリスト - 親しみやすいデザイン */
.course-card__skills {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.course-card__skills li {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  background: var(--color-primary-pale);
  border-radius: 50px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary-dark);
  transition: all 0.3s ease;
}

.course-card__skills li::before {
  content: "✓";
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.course-card:hover .course-card__skills li {
  background: rgba(0, 200, 83, 0.15);
  transform: scale(1.02);
}

.course-card__old-name {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  padding: 0.375rem 0.875rem;
  background: var(--color-gray-100);
  border-radius: 50px;
}

.course-card__old-name::before {
  content: "←";
  font-size: 0.75rem;
  opacity: 0.6;
}

/* =====================================================
   Overview Section - Asobi Gym Inspired Visual Design
   ===================================================== */

.overview {
  background-color: var(--color-background);
}

.overview .section-title {
  text-align: center;
  color: var(--color-text);
  margin-bottom: var(--spacing-4);
}

.overview .section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-12);
}

/* =====================================================
   Change Summary Section - Visual Impact Design
   ===================================================== */

.change-summary {
  display: flex;
  justify-content: center;
  gap: var(--spacing-8);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-16);
}

.summary-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-8) var(--spacing-10);
  border-radius: 32px;
  min-width: 180px;
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.08),
    0 2px 8px rgba(0, 0, 0, 0.04);
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.summary-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.3) 0%, transparent 50%);
  pointer-events: none;
}

.summary-box:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 
    0 16px 48px rgba(0, 0, 0, 0.12),
    0 4px 12px rgba(0, 0, 0, 0.06);
}

/* Summary Box Variants by Type */
.summary-box--new {
  background: linear-gradient(135deg, #E8F5E9 0%, #C8E6C9 100%);
  border: 3px solid #4CAF50;
}

.summary-box--new .summary-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-2);
  animation: icon-bounce 2s ease-in-out infinite;
}

.summary-box--new .summary-number {
  color: #2E7D32;
}

.summary-box--new .summary-label {
  color: #1B5E20;
}

.summary-box--renamed {
  background: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 100%);
  border: 3px solid #2196F3;
}

.summary-box--renamed .summary-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-2);
  animation: icon-pulse 2s ease-in-out infinite;
}

.summary-box--renamed .summary-number {
  color: #1565C0;
}

.summary-box--renamed .summary-label {
  color: #0D47A1;
}

.summary-box--merged {
  background: linear-gradient(135deg, #FFF3E0 0%, #FFE0B2 100%);
  border: 3px solid #FF9800;
}

.summary-box--merged .summary-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-2);
  animation: icon-rotate 3s ease-in-out infinite;
}

.summary-box--merged .summary-number {
  color: #EF6C00;
}

.summary-box--merged .summary-label {
  color: #E65100;
}

/* Summary Content */
.summary-number {
  font-size: 4rem;
  font-weight: var(--font-weight-black);
  line-height: 1;
  margin-bottom: var(--spacing-2);
}

.summary-label {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.05em;
}

/* Icon Animations */
@keyframes icon-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes icon-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes icon-rotate {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-10deg); }
  75% { transform: rotate(10deg); }
}

/* =====================================================
   Before/After Comparison - Improved Design
   ===================================================== */

.overview__comparison {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--spacing-8);
  align-items: stretch;
}

.overview__before,
.overview__after {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
}

.overview__before h3,
.overview__after h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--spacing-6);
  text-align: center;
  padding-bottom: var(--spacing-4);
  border-bottom: 2px solid var(--color-gray-200);
}

.overview__before ul,
.overview__after ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.overview__before li {
  font-size: var(--font-size-base);
  color: var(--color-text);
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: 1px solid var(--color-gray-100);
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  transition: background-color 0.2s ease;
  border-radius: 8px;
}

.overview__before li:hover {
  background-color: var(--color-gray-100);
}

.overview__after li {
  font-size: var(--font-size-base);
  color: var(--color-text);
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: 1px solid var(--color-gray-100);
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  flex-wrap: wrap;
  transition: background-color 0.2s ease;
  border-radius: 8px;
}

.overview__after li:hover {
  background-color: var(--color-gray-100);
}

.overview__before li:last-child,
.overview__after li:last-child {
  border-bottom: none;
}

/* Arrow */
.overview__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  animation: arrow-pulse 2s ease-in-out infinite;
}

.overview__arrow svg {
  filter: drop-shadow(0 4px 8px rgba(0, 200, 83, 0.3));
}

@keyframes arrow-pulse {
  0%,
  100% {
    transform: translateX(0);
    opacity: 1;
  }
  50% {
    transform: translateX(8px);
    opacity: 0.7;
  }
}

/* Change Tags */
.change-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: 50px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.change-tag--new {
  background: linear-gradient(135deg, #4CAF50 0%, #66BB6A 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.4);
}

.change-tag--renamed {
  background: linear-gradient(135deg, #2196F3 0%, #42A5F5 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(33, 150, 243, 0.4);
}

.change-tag--merged {
  background: linear-gradient(135deg, #FF9800 0%, #FFB74D 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(255, 152, 0, 0.4);
}

.course-name {
  font-weight: var(--font-weight-medium);
  flex: 1;
}

/* Legacy badge classes for backward compatibility */
.badge-new {
  background-color: var(--color-accent);
  color: white;
}

.badge-renamed {
  background-color: var(--color-accent-blue);
  color: white;
}

.badge-merged {
  background-color: var(--color-primary);
  color: white;
}

/* Legacy summary styles for backward compatibility */
.overview__summary {
  display: none;
}

.summary-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2);
}

.summary-item .summary-number {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-black);
  color: var(--color-primary);
  line-height: 1;
}

.summary-item .summary-label {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

/* Overview Responsive */
@media screen and (max-width: 768px) {
  .hero__content {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }

  .hero__typography {
    align-items: center;
    text-align: center;
  }

  .hero__main-title {
    align-items: center;
  }

  .hero__title-line {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  .hero__title-line--highlight {
    font-size: clamp(2.5rem, 12vw, 3.5rem);
  }

  .hero__catchphrase {
    font-size: var(--font-size-lg);
    text-align: center;
  }

  .hero__floating {
    display: none;
  }

  .hero__bg-circle--1 {
    width: 500px;
    height: 500px;
    top: -200px;
    right: -150px;
  }

  .hero__bg-circle--2 {
    width: 400px;
    height: 400px;
    bottom: -150px;
    left: -100px;
  }

  .hero__image-frame {
    max-width: 320px;
    transform: rotate(0deg);
  }

  .overview__comparison {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }

  .overview__arrow {
    transform: rotate(90deg);
    padding: var(--spacing-4) 0;
  }

  @keyframes arrow-pulse {
    0%,
    100% {
      transform: rotate(90deg) translateX(0);
      opacity: 1;
    }
    50% {
      transform: rotate(90deg) translateX(8px);
      opacity: 0.7;
    }
  }

  .overview__before,
  .overview__after {
    padding: var(--spacing-6);
  }

  .overview__summary {
    gap: var(--spacing-8);
  }

  .summary-number {
    font-size: var(--font-size-4xl);
  }

  /* Change Summary - Tablet */
  .change-summary {
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-12);
  }

  .summary-box {
    min-width: 160px;
    padding: var(--spacing-6) var(--spacing-8);
  }

  .summary-box .summary-number {
    font-size: 3.5rem;
  }

  .courses-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }

  .section-title {
    font-size: var(--font-size-3xl);
  }

  .section-subtitle {
    font-size: var(--font-size-base);
  }

  .section {
    padding-top: var(--spacing-12);
    padding-bottom: var(--spacing-12);
  }
}

/* モバイル (640px以下) */
@media (max-width: 640px) {
  .header {
    height: var(--header-height-mobile);
  }

  .hero {
    padding-top: var(--header-height-mobile);
    min-height: auto;
    padding-bottom: var(--spacing-8);
  }

  .hero__badge {
    padding: var(--spacing-2) var(--spacing-4);
  }

  .hero__badge-year {
    font-size: 10px;
  }

  .hero__badge-text {
    font-size: var(--font-size-lg);
  }

  .hero__title-line {
    font-size: 2rem;
  }

  .hero__title-line--highlight {
    font-size: 2.5rem;
  }

  .hero__title-line--highlight::after {
    height: 8px;
    bottom: 4px;
  }

  .hero__catchphrase {
    font-size: var(--font-size-base);
  }

  .hero__cta {
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
  }

  .hero__scroll {
    margin-top: var(--spacing-8);
  }

  .hero__scroll-line {
    height: 40px;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .container {
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
  }

  .course-card__image {
    height: 160px;
  }

  .course-card__content {
    padding: var(--spacing-4);
  }

  .course-card__title {
    font-size: var(--font-size-lg);
  }

  .overview__before h3,
  .overview__after h3 {
    font-size: var(--font-size-lg);
  }

  .overview__before li,
  .overview__after li {
    font-size: var(--font-size-sm);
  }

  .summary-number {
    font-size: var(--font-size-3xl);
  }

  .summary-label {
    font-size: var(--font-size-sm);
  }

  /* Change Summary - Mobile */
  .change-summary {
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-10);
  }

  .summary-box {
    min-width: 140px;
    padding: var(--spacing-6) var(--spacing-8);
    border-radius: 24px;
  }

  .summary-box .summary-icon {
    font-size: 2rem;
  }

  .summary-box .summary-number {
    font-size: 3rem;
  }

  .summary-box .summary-label {
    font-size: var(--font-size-base);
  }

  /* Change Tags - Mobile */
  .change-tag {
    padding: 2px var(--spacing-2);
    font-size: 10px;
  }

  .course-name {
    font-size: var(--font-size-sm);
  }

  .overview__after li {
    padding: var(--spacing-2) var(--spacing-3);
  }

  .hero__bg-circle--1 {
    width: 300px;
    height: 300px;
    top: -100px;
    right: -80px;
  }

  .hero__bg-circle--2 {
    width: 250px;
    height: 250px;
    bottom: -80px;
    left: -60px;
  }

  .btn-lg {
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
  }
}

/* タッチターゲット */
.btn,
.hamburger,
.mobile-menu__cta-button {
  min-height: 44px;
  min-width: 44px;
}

.hamburger {
  width: 44px;
  height: 44px;
  padding: 10px;
}