@charset "UTF-8";

/* ==========================================================================
   Variables
   ========================================================================== */
:root {
  /* Colors */
  --color-primary: #003366;
  --color-accent: #0066CC;
  --color-sub: #F5F7FA;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-white: #FFFFFF;
  --color-border: #E0E0E0;

  /* Typography */
  --font-base: "Noto Sans JP", "Helvetica Neue", "Helvetica", "Arial", sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.8;

  /* Spacing */
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 32px;
  --spacing-xl: 64px;
  --spacing-xxl: 120px;

  /* Layout */
  --container-width: 1200px;
  --header-height: 80px;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  opacity: 0.7;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: bottom;
}

ul {
  list-style: none;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--spacing-md);
}

.section-title {
  font-size: 2.5rem;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
  letter-spacing: 0.05em;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--color-accent);
  margin: var(--spacing-md) auto 0;
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--color-accent);
  text-align: center;
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xxl) 0;
}

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

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

/* ==========================================================================
   Components
   ========================================================================== */
/* Button */
.btn {
  display: inline-block;
  padding: 14px 40px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: 50px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-align: center;
  border: 2px solid transparent;
  transition: all 0.3s ease;
}

.btn:hover {
  background-color: var(--color-white);
  color: var(--color-accent);
  border-color: var(--color-accent);
  opacity: 1;
}

.btn-large {
  font-size: 1.25rem;
  padding: 16px 50px;
}

/* Card */
.card {
  background: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-content {
  padding: var(--spacing-lg);
  flex-grow: 1;
}

.card-title {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ==========================================================================
   Header
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  z-index: 1000;
  display: flex;
  align-items: center;
  backdrop-filter: blur(10px);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-weight: 500;
  color: var(--color-primary);
  position: relative;
}

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

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

.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  padding: 10px;
}

.hamburger-line {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-primary);
  margin: 5px 0;
  transition: all 0.3s ease;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  height: 85vh;
  min-height: 600px;
  background-size: cover;
  background-position: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-white);
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 51, 102, 0.6);
  /* Overlay */
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  padding: 0 var(--spacing-md);
}

.hero-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
  font-weight: 400;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.footer-nav {
  margin-bottom: var(--spacing-lg);
}

.footer-nav ul {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
}

.copyright {
  font-size: 0.875rem;
  opacity: 0.7;
}

/* ==========================================================================
   Animations
   ========================================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1200px) {
  :root {
    --container-width: 960px;
  }
}

@media (max-width: 1024px) {
  .hero-title {
    font-size: 3rem;
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
    --spacing-xxl: 80px;
  }

  .section-title {
    font-size: 2rem;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  /* Mobile Nav */
  .hamburger {
    display: block;
    z-index: 1002;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background-color: var(--color-white);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: right 0.3s ease;
    z-index: 1001;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-menu.active+.overlay {
    display: block;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .footer-nav ul {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  /* Hamburger Animation */
  .hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

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

  .hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  /* About Section Order */
  .about-grid {
    display: flex;
    flex-direction: column-reverse;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .btn-large {
    width: 100%;
    padding: 14px 20px;
  }
}