/* ================================
   Minimalist Black & White Design
   Inspired by NOT A HOTEL & Kyu Camera
   Portfolio by Ryo Tsuzukihashi
   ================================ */

/* ========== Variables ========== */
:root {
  /* Minimalist Black & White Color Palette */
  --color-primary: #000000;
  --color-secondary: #666666;
  --color-text: #1a1a1a;
  --color-text-light: #999999;
  --color-background: #FFFFFF;
  --color-accent: #fafafa;
  --color-border: #e0e0e0;

  /* Accent Colors - Memories & Technology */
  --color-accent-warm: #000000;
  --color-accent-cool: #000000;

  /* Typography */
  --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-accent: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Spacing - Generous whitespace */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 8rem;

  /* Animation - Subtle and refined */
  --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  --animation-float: float 12s ease-in-out infinite;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background-color: var(--color-background);
  line-height: 1.8;
  font-weight: 300;
  letter-spacing: -0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========== Typography ========== */
h1 {
  font-size: clamp(3.5rem, 6vw, 6rem);
  font-weight: 200;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(2.5rem, 4.5vw, 4rem);
  font-weight: 200;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

h3 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

p {
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
  color: var(--color-secondary);
  font-weight: 300;
  line-height: 1.9;
}

.text-gradient {
  color: var(--color-primary);
  font-weight: 400;
}

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-xs) 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  transition: var(--transition-normal);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  padding: var(--space-xs) 0;
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.03);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 400;
  font-family: var(--font-accent);
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-normal);
  letter-spacing: -0.01em;
}

.nav-logo:hover {
  color: var(--color-secondary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  position: relative;
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--color-secondary);
  text-decoration: none;
  transition: var(--transition-normal);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition-spring);
  border-radius: 2px;
}

.nav-link:hover {
  color: var(--color-primary);
  transform: translateY(-2px);
}

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

.nav-link.active {
  color: #1a1a1a;
}

.nav-link.active::after {
  width: 100%;
  background: #1a1a1a;
}

/* ========== Hero Section ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: var(--space-2xl) var(--space-xl);
  background: var(--color-background);
  background-image: url('../images/main_image.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-background);
  opacity: 0.92;
  z-index: 1;
}

.hero-content {
  max-width: 1200px;
  width: 100%;
  text-align: center;
  z-index: 2;
  position: relative;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  margin-bottom: 3rem;
  background: var(--color-primary);
  border-radius: var(--radius-xl);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-background);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: none;
  animation: slideDown 0.8s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.hero-title {
  margin-bottom: var(--space-xl);
  animation: slideUp 0.8s ease 0.2s both;
}

.hero-subtitle {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  color: var(--color-secondary);
  margin-bottom: var(--space-2xl);
  font-weight: 300;
  line-height: 1.8;
  animation: slideUp 0.8s ease 0.4s both;
}

.hero-cta {
  display: inline-flex;
  gap: var(--space-md);
  animation: slideUp 0.8s ease 0.6s both;
}

/* ========== Buttons ========== */
.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: var(--transition-spring);
  cursor: pointer;
  border: 2px solid var(--color-primary);
  font-family: var(--font-main);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

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

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

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

.btn-secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-background);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* ========== Memory Cards (Portfolio) ========== */
.memory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-2xl);
  margin-top: var(--space-xl);
}

.memory-card {
  background: var(--color-background);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: var(--transition-spring);
  cursor: pointer;
  position: relative;
}

.memory-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.memory-card:hover::before {
  transform: scaleX(1);
}

.memory-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.08);
  border-color: var(--color-primary);
}

.memory-card-image {
  position: relative;
  height: 300px;
  overflow: hidden;
  background: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.memory-card-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: var(--transition-slow);
}

.memory-card:hover .memory-card-image img {
  transform: scale(1.02);
}

.memory-card-badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-background);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.memory-card-content {
  padding: var(--space-lg);
}

.memory-card-title {
  font-size: 1.75rem;
  font-weight: 300;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.memory-card-description {
  font-size: 1rem;
  color: var(--color-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.8;
  font-weight: 300;
}

.memory-card-stats {
  display: flex;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.memory-stat {
  display: flex;
  flex-direction: column;
}

.memory-stat-value {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.memory-stat-label {
  font-size: 0.75rem;
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 300;
}

/* ========== Timeline (Journey) ========== */
.timeline {
  position: relative;
  padding: var(--space-xl) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-border);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-2xl);
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-content {
  width: 45%;
  padding: var(--space-lg);
  background: var(--color-background);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  position: relative;
  transition: var(--transition-spring);
}

.timeline-content:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.1);
}

.timeline-year {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 80px;
  height: 80px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-background);
  font-weight: 600;
  font-size: 1.25rem;
  border: none;
  letter-spacing: -0.02em;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.timeline-item:nth-child(odd) .timeline-year {
  right: -40px;
}

.timeline-item:nth-child(even) .timeline-year {
  left: -40px;
}

/* ========== Sections ========== */
.section {
  padding: var(--space-2xl) 0;
  position: relative;
}

.section-alt {
  background: var(--color-accent);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  margin-bottom: var(--space-md);
  background: var(--color-primary);
  color: var(--color-background);
  border-radius: var(--radius-xl);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.section-title {
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

.section-description {
  max-width: 900px;
  margin: 0 auto;
  font-size: 1.25rem;
  color: var(--color-secondary);
  line-height: 1.9;
  font-weight: 300;
}

/* ========== Floating Memory Shapes (Minimized for clean design) ========== */
.memory-shapes {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
  display: none; /* Hidden for minimal design */
}

/* ========== Stats Counter ========== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.stat-card {
  text-align: center;
  padding: var(--space-xl);
  background: var(--color-background);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: var(--transition-spring);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.03), transparent);
  transition: left 0.5s;
}

.stat-card:hover::before {
  left: 100%;
}

.stat-card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: var(--color-primary);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.1);
}

.stat-number {
  font-size: 4rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.03em;
  transition: transform 0.3s ease;
}

.stat-card:hover .stat-number {
  transform: scale(1.1);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-secondary);
  font-weight: 300;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-xs);
}

.stat-description {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: var(--space-xs);
  font-weight: 300;
  line-height: 1.6;
}

/* ========== Animations ========== */
@keyframes float {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-20px) rotate(5deg);
  }
  50% {
    transform: translateY(10px) rotate(-5deg);
  }
  75% {
    transform: translateY(-10px) rotate(3deg);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
  from {
    opacity: 0;
    transform: translateY(30px);
  }
}

/* ========== Responsive ========== */

/* Tablet & Mobile (768px以下) */
@media (max-width: 768px) {
  /* コンテナのパディング調整 */
  .container {
    padding: 0 var(--space-md);
  }

  .nav-container {
    padding: 0 var(--space-md);
  }

  /* ナビゲーション - HIG準拠フルスクリーンメニュー */
  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1001;
  }

  .nav-menu.active {
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    font-size: 1.5rem;
    font-weight: 500;
    padding: 16px 32px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-transform: none;
    letter-spacing: 0;
    color: var(--color-primary);
  }

  .nav-link:active {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 12px;
  }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    cursor: pointer;
    z-index: 1002;
    -webkit-tap-highlight-color: transparent;
  }

  .nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
    transition: all 0.3s ease;
    margin: 3px 0;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
  }

  /* ヒーローセクション */
  .hero {
    padding: var(--space-xl) var(--space-md);
    min-height: auto;
    padding-top: 100px;
  }

  .hero-badge {
    font-size: 0.65rem;
    padding: 0.4rem 1rem;
    margin-bottom: 2rem;
  }

  .hero-title {
    margin-bottom: var(--space-lg);
  }

  h1 {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: var(--space-xl);
    line-height: 1.7;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
    padding: 0.875rem 2rem;
  }

  /* セクション */
  .section {
    padding: var(--space-xl) 0;
  }

  .section-header {
    margin-bottom: var(--space-xl);
  }

  h2 {
    font-size: clamp(1.75rem, 6vw, 2.5rem);
  }

  .section-description {
    font-size: 1rem;
    line-height: 1.8;
  }

  /* メモリーカードグリッド */
  .memory-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .memory-card-image {
    height: 200px;
    padding: var(--space-md);
  }

  .memory-card-content {
    padding: var(--space-md);
  }

  .memory-card-title {
    font-size: 1.375rem;
  }

  .memory-card-stats {
    gap: var(--space-md);
  }

  .memory-stat-value {
    font-size: 1.25rem;
  }

  /* タイムライン */
  .timeline {
    padding: var(--space-lg) 0;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    flex-direction: row;
    margin-bottom: var(--space-xl);
  }

  .timeline-content {
    width: calc(100% - 70px);
    margin-left: 50px;
    padding: var(--space-md);
  }

  .timeline-content h3 {
    font-size: 1.125rem;
  }

  .timeline-content p {
    font-size: 0.9375rem;
    margin-bottom: 0;
  }

  .timeline-year {
    position: absolute;
    left: 0 !important;
    right: auto !important;
    width: 50px;
    height: 50px;
    font-size: 0.875rem;
  }

  /* 統計グリッド */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  .stat-card {
    padding: var(--space-md);
  }

  .stat-number {
    font-size: 2rem;
  }

  .stat-label {
    font-size: 0.75rem;
  }

  .stat-description {
    font-size: 0.75rem;
  }

  /* フッター */
  .footer {
    padding: var(--space-xl) 0 var(--space-lg) 0;
  }

  .footer-content {
    padding: 0 var(--space-md);
  }

  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .footer-link {
    margin: 0;
  }

  .footer-sns {
    gap: var(--space-sm);
  }

  .sns-link {
    width: 40px;
    height: 40px;
  }

  .sns-icon {
    width: 18px;
    height: 18px;
  }
}

/* スマートフォン (480px以下) */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-sm);
  }

  .nav-container {
    padding: 0 var(--space-sm);
  }

  .nav {
    padding: var(--space-sm) 0;
  }

  .nav-logo {
    font-size: 1.125rem;
  }

  /* ヒーロー */
  .hero {
    padding: var(--space-lg) var(--space-sm);
    padding-top: 80px;
  }

  .hero-badge {
    font-size: 0.6rem;
    padding: 0.35rem 0.875rem;
  }

  h1 {
    font-size: clamp(1.75rem, 7vw, 2.5rem);
    line-height: 1.2;
  }

  .hero-subtitle {
    font-size: 0.9375rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.8125rem;
  }

  /* セクション */
  .section {
    padding: var(--space-lg) 0;
  }

  .section-badge {
    font-size: 0.6875rem;
    padding: 0.4rem 1rem;
  }

  h2 {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }

  .section-description {
    font-size: 0.9375rem;
  }

  /* カード */
  .memory-card-image {
    height: 180px;
  }

  .memory-card-badge {
    font-size: 0.625rem;
    padding: 0.375rem 0.75rem;
    top: var(--space-sm);
    right: var(--space-sm);
  }

  .memory-card-title {
    font-size: 1.25rem;
  }

  .memory-card-description {
    font-size: 0.9375rem;
  }

  .memory-card-stats {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .memory-stat-value {
    font-size: 1.125rem;
  }

  .memory-stat-label {
    font-size: 0.6875rem;
  }

  /* タイムライン */
  .timeline::before {
    left: 15px;
  }

  .timeline-content {
    width: calc(100% - 55px);
    margin-left: 40px;
    padding: var(--space-sm);
  }

  .timeline-content h3 {
    font-size: 1rem;
  }

  .timeline-content p {
    font-size: 0.875rem;
  }

  .timeline-year {
    width: 40px;
    height: 40px;
    font-size: 0.75rem;
  }

  /* 統計 */
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .stat-card {
    padding: var(--space-sm);
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .stat-label {
    font-size: 0.625rem;
    letter-spacing: 0.05em;
  }

  .stat-description {
    font-size: 0.625rem;
    display: none;
  }

  /* フッター */
  .footer-copyright,
  .footer-tagline {
    font-size: 0.75rem;
  }

  .footer-link {
    font-size: 0.75rem;
  }

  /* 引用文のサイズ調整 */
  blockquote {
    font-size: 1.125rem !important;
    padding: 0 var(--space-sm);
  }
}

/* 小型スマートフォン (320px以下) */
@media (max-width: 320px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .hero-badge {
    font-size: 0.5625rem;
  }

  .hero-subtitle {
    font-size: 0.875rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-number {
    font-size: 2rem;
  }

  .stat-description {
    display: block;
  }
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none;
  }
}

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

.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

/* ========== Footer ========== */
.footer {
  background: var(--color-primary);
  color: var(--color-background);
  padding: var(--space-2xl) 0 var(--space-xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-secondary);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.footer-copyright {
  color: var(--color-background);
  opacity: 0.9;
  margin-bottom: var(--space-sm);
  margin-top: var(--space-lg);
  font-size: 0.875rem;
  font-weight: 400;
}

.footer-tagline {
  color: var(--color-background);
  opacity: 0.7;
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
  font-weight: 300;
}

.footer-links {
  margin-top: var(--space-lg);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-link {
  color: var(--color-background);
  opacity: 0.7;
  margin: 0 var(--space-sm);
  text-decoration: none;
  font-size: 0.875rem;
  transition: var(--transition-normal);
  position: relative;
  padding-bottom: 4px;
}

.footer-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-background);
  transition: var(--transition-normal);
}

.footer-link:hover {
  opacity: 1;
}

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

/* ========== Footer SNS Icons ========== */
.footer-sns {
  margin-top: var(--space-lg);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
}

.sns-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition-spring);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.sns-link::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.4s, height 0.4s;
}

.sns-link:hover::before {
  width: 100px;
  height: 100px;
}

.sns-link:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-4px) rotate(5deg) scale(1.1);
}

.sns-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
  transition: var(--transition-normal);
  opacity: 0.9;
}

.sns-link:hover .sns-icon {
  opacity: 1;
}

@media (max-width: 768px) {
  .footer-sns {
    gap: 1rem;
  }
  
  .sns-link {
    width: 36px;
    height: 36px;
  }
  
  .sns-icon {
    width: 20px;
    height: 20px;
  }
}