/* ========================================
   xbs Corporate Site 2026 - Global Styles
   ======================================== */

:root {
  --color-primary: #1a1a2e;
  --color-secondary: #16213e;
  --color-accent: #0f3460;
  --color-highlight: #e94560;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  --max-width: 1200px;
  --header-height: 80px;
}

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

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a:hover {
  color: var(--color-highlight);
}

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

ul, ol {
  list-style: none;
}

/* ========================================
   Header
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid #eee;
  z-index: 1000;
}

.header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--color-primary);
}

.header__nav {
  display: flex;
  gap: 2rem;
}

.header__nav a {
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   Main Content
   ======================================== */
main {
  flex: 1;
  margin-top: var(--header-height);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Hero Section */
.hero {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: #fff;
  text-align: center;
}

.hero__title {
  font-size: 3rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.hero__subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
}

/* Page Header */
.page-header {
  padding: 60px 0;
  background-color: var(--color-bg-alt);
  text-align: center;
}

.page-header__title {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.page-header__description {
  font-size: 1.1rem;
  color: var(--color-text-light);
}

/* Section */
.section {
  padding: 80px 0;
}

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

.section__title {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 2rem;
  text-align: center;
}

/* Placeholder Content */
.placeholder {
  background-color: var(--color-bg-alt);
  border: 2px dashed #ddd;
  border-radius: 8px;
  padding: 60px 40px;
  text-align: center;
  color: var(--color-text-light);
}

.placeholder__icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.placeholder__text {
  font-size: 1.1rem;
}

/* Grid */
.grid {
  display: grid;
  gap: 2rem;
}

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

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

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

/* Card */
.card {
  background-color: var(--color-bg);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.card__image {
  width: 100%;
  height: 200px;
  background-color: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
}

.card__content {
  padding: 1.5rem;
}

.card__title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.card__text {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background-color: var(--color-primary);
  color: #fff;
  padding: 40px 0;
  margin-top: auto;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  text-align: center;
}

.footer__copyright {
  font-size: 0.875rem;
  opacity: 0.8;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }