:root {
  /* Colors */
  --bg: #FFFFFF;
  --surface: #F7FAFF;
  --text: #15202B;
  --muted: #5C6B7A;
  --primary: #E53935;
  --primary-2: #FF5A57;
  --secondary: #33A9FF;
  --secondary-2: #7BD3FF;
  --accent: #FFD166;
  --line: #E6EEF8;
  --shadow: rgba(21, 32, 43, 0.12);
  --ok: #2CB67D;
  --danger: #D64545;

  /* Gradients */
  --grad-hero: linear-gradient(90deg, rgba(229, 57, 53, 0.14) 0%, rgba(51, 169, 255, 0.14) 100%);

  /* Typography */
  --font-jp: 'Noto Sans JP', sans-serif;
  --font-en: 'Inter', sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;
  --space-3xl: 48px;
  --space-4xl: 64px;

  /* Border Radius */
  --radius-card: 16px;
  --radius-btn: 999px;
  --radius-sm: 8px;
}

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

body {
  font-family: var(--font-en), var(--font-jp);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-lg);
}

a {
  text-decoration: none;
  color: inherit;
  transition: opacity 0.3s ease;
}

ul {
  list-style: none;
}

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

/* Utility Classes */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: 80px 0;
}

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

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

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

/* Typography Scale */
.text-xs {
  font-size: 12px;
}

.text-sm {
  font-size: 14px;
}

.text-base {
  font-size: 16px;
}

.text-lg {
  font-size: 18px;
}

.text-xl {
  font-size: 24px;
}

.text-2xl {
  font-size: 32px;
}

.text-3xl {
  font-size: 44px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  border-radius: var(--radius-btn);
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(229, 57, 53, 0.3);
}

.btn-primary:hover {
  background-color: var(--primary-2);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(229, 57, 53, 0.4);
}

.btn-secondary {
  background-color: var(--secondary);
  color: white;
  box-shadow: 0 4px 12px rgba(51, 169, 255, 0.3);
}

.btn-secondary:hover {
  background-color: var(--secondary-2);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(51, 169, 255, 0.4);
}

.btn-ghost {
  background-color: transparent;
  border: 2px solid var(--line);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--muted);
  background-color: var(--surface);
}

/* Cards */
.card {
  background: white;
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  box-shadow: 0 4px 20px var(--shadow);
  transition: all 0.3s ease;
  border: 1px solid var(--line);
}

.card:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 32px rgba(21, 32, 43, 0.15);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px var(--shadow);
  padding: var(--space-md) 0;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-menu {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  font-weight: 500;
  font-size: 15px;
  color: var(--text);
  position: relative;
}

.nav-link:hover {
  color: var(--primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--primary);
  transition: width 0.3s ease;
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
}

/* Footer */
.footer {
  background-color: var(--surface);
  padding: 60px 0 20px;
  border-top: 1px solid var(--line);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

/* Animations (Intersection Observer Targets) */
.anim-target {
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.is-visible {
  opacity: 1;
}

.slide-up {
  transform: translateY(30px);
}

.slide-up.is-visible {
  transform: translateY(0);
  opacity: 1;
}

.slide-left {
  transform: translateX(-30px);
}

.slide-left.is-visible {
  transform: translateX(0);
  opacity: 1;
}

.slide-right {
  transform: translateX(30px);
}

.slide-right.is-visible {
  transform: translateX(0);
  opacity: 1;
}

.stagger-group .stagger-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-group.is-visible .stagger-item:nth-child(1) {
  transition-delay: 0.1s;
  opacity: 1;
  transform: translateY(0);
}

.stagger-group.is-visible .stagger-item:nth-child(2) {
  transition-delay: 0.2s;
  opacity: 1;
  transform: translateY(0);
}

.stagger-group.is-visible .stagger-item:nth-child(3) {
  transition-delay: 0.3s;
  opacity: 1;
  transform: translateY(0);
}

.stagger-group.is-visible .stagger-item:nth-child(4) {
  transition-delay: 0.4s;
  opacity: 1;
  transform: translateY(0);
}

.stagger-group.is-visible .stagger-item:nth-child(5) {
  transition-delay: 0.5s;
  opacity: 1;
  transform: translateY(0);
}

.stagger-group.is-visible .stagger-item:nth-child(6) {
  transition-delay: 0.6s;
  opacity: 1;
  transform: translateY(0);
}

.stagger-group.is-visible .stagger-item:nth-child(7) {
  transition-delay: 0.7s;
  opacity: 1;
  transform: translateY(0);
}

.stagger-group.is-visible .stagger-item:nth-child(8) {
  transition-delay: 0.8s;
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {

  .anim-target,
  .stagger-item {
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: white;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-150%);
    transition: transform 0.4s ease;
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .mobile-menu-btn {
    display: block;
  }

  .text-3xl {
    font-size: 32px;
  }

  .section {
    padding: 50px 0;
  }

  /* Reset Promises layout on mobile */
  .promises-container {
    flex-direction: column;
    align-items: center;
  }
}

/* Promises Section Special Styles */
.promises-section {
  position: relative;
  background-size: cover;
  background-position: center;
  padding: 100px 0;
  overflow: hidden;
}

.promises-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0) 100%);
}

.promises-layout {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  /* Align left */
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
}

.card-glass {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  color: var(--text);
  margin-bottom: 24px;
  max-width: 450px;
  /* Limit width for the vertical list */
  width: 100%;
  transform-origin: left center;
}

.card-glass:hover {
  background: rgba(255, 255, 255, 0.95);
  transform: scale(1.02) translateX(10px);
}

.section-title-white {
  color: white;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  margin-bottom: 48px;
}