@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');


/* ===== CSS Custom Properties ===== */
:root {
  --color-primary: #1a7fa0;
  --color-primary-dark: #14627d;
  --color-primary-light: #e8f4f8;
  --color-white: #ffffff;
  --color-off-white: #f8f9fa;
  --color-light-gray: #f0f1f3;
  --color-medium-gray: #c8ccd0;
  --color-dark-gray: #4a4a4a;
  --color-near-black: #222222;
  --color-black: #111111;
  --color-accent-red: #d63031;

  --overlay-dark: rgba(0, 0, 0, 0.45);
  --overlay-white: rgba(255, 255, 255, 0.88);
  --overlay-white-strong: rgba(255, 255, 255, 0.94);

  --font-primary: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --font-english: 'Montserrat', 'Noto Sans JP', sans-serif;

  --text-hero-main: clamp(2.5rem, 5vw, 4rem);
  --text-hero-sub: clamp(1.1rem, 2vw, 1.5rem);
  --text-section-english: clamp(0.75rem, 1.2vw, 0.875rem);
  --text-section-title: clamp(1.5rem, 3vw, 2.25rem);
  --text-card-title: clamp(1.125rem, 2vw, 1.375rem);
  --text-body: 1rem;
  --text-body-large: 1.125rem;
  --text-small: 0.875rem;
  --text-number-large: clamp(2.5rem, 5vw, 4rem);

  --leading-tight: 1.4;
  --leading-normal: 1.8;
  --leading-loose: 2.0;

  --tracking-wide: 0.08em;
  --tracking-wider: 0.15em;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  --container-max: 1200px;
  --container-narrow: 900px;
  --container-wide: 1400px;
  --container-padding: clamp(1.25rem, 4vw, 3rem);
}

/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-body);
  font-weight: 400;
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-wide);
  color: var(--color-dark-gray);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

/* ===== Base Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--color-near-black);
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: var(--text-section-title); }
h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  margin-bottom: 15px;
  padding-left: 0.75rem;
  border-left: 3px solid var(--color-primary);
}
h4 { font-size: var(--text-card-title); }
h5 { font-size: 1rem; }

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 700;
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-white { color: var(--color-white); }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent-red); }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.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;
}

.bg-off-white { background-color: var(--color-off-white); }
.bg-light-gray { background-color: var(--color-light-gray); }
.bg-primary-light { background-color: var(--color-primary-light); }

/* ===== Preloader ===== */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1.5rem;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader__logo {
  height: 40px;
  width: auto;
}

.preloader__bar {
  width: 120px;
  height: 2px;
  background: var(--color-light-gray);
  border-radius: 2px;
  overflow: hidden;
}

.preloader__bar::after {
  content: '';
  display: block;
  width: 40%;
  height: 100%;
  background: var(--color-primary);
  border-radius: 2px;
  animation: preloaderSlide 1s ease-in-out infinite;
}

@keyframes preloaderSlide {
  0%   { transform: translateX(-100%); }
  50%  { transform: translateX(200%); }
  100% { transform: translateX(-100%); }
}

/* ===== Animation Keyframes ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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