/* ==========================================================================
   Design System & Tokens
   ========================================================================== */
:root {
  /* Color Palette */
  --color-primary: #04384c;
  --color-primary-light: #0d5c7a;
  --color-primary-dark: #022330;
  --color-primary-subtle: rgba(4, 56, 76, 0.05);

  --color-accent-blue: #0284c7;
  --color-accent-cyan: #38bdf8;
  --color-accent-amber: #f59e0b;
  --color-accent-amber-light: #fef3c7;
  --color-line-green: #06c755;
  --color-line-green-hover: #05a847;

  --color-bg-main: #f8fafc;
  --color-bg-card: #ffffff;
  --color-bg-dark: #0f172a;
  
  --color-text-main: #1e293b;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-text-white: #ffffff;

  --color-border: #e2e8f0;
  --color-border-subtle: #f1f5f9;

  /* Typography */
  --font-sans: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-en: "Outfit", -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 4px 20px rgba(4, 56, 76, 0.06);
  --shadow-card-hover: 0 12px 28px rgba(4, 56, 76, 0.12);

  /* Spacing & Sizing */
  --container-max-width: 1160px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  line-height: 1.7;
  overflow-x: hidden;
  word-break: normal;
  overflow-wrap: break-word;
  line-break: strict;
  text-rendering: optimizeLegibility;
}

/* Typography & Responsive Text Wrapping Best Practices */
h1, h2, h3, h4, h5, h6,
.section-title,
.hero-tagline,
.feature-title,
.service-title,
.work-title,
.contact-form-title {
  text-wrap: balance;
  word-break: auto-phrase;
  overflow-wrap: break-word;
}

p,
.section-desc,
.feature-desc,
.service-summary,
.work-summary,
.voc-comment,
.faq-a-content p {
  text-wrap: pretty;
  word-break: auto-phrase;
  overflow-wrap: break-word;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Sticky Navigation
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  transition: height var(--transition-normal), box-shadow var(--transition-normal);
}

.header.is-scrolled {
  height: 60px;
  box-shadow: var(--shadow-md);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.01em;
  min-width: 0;
}

.site-logo-text {
  font-size: clamp(0.85rem, 3.4vw, 1.15rem);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.logo-icon {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent-blue));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-family: var(--font-en);
  font-size: 1.1rem;
  box-shadow: 0 2px 8px rgba(4, 56, 76, 0.2);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-desktop .nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-desktop .nav-link {
  font-size: 0.925rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-main);
  position: relative;
  transition: all var(--transition-fast);
}

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

.header-cta-btn {
  margin-left: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 8px rgba(4, 56, 76, 0.2);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.header-cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(4, 56, 76, 0.28);
}

/* Mobile Menu Button */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-primary);
}

.mobile-menu-toggle svg {
  width: 28px;
  height: 28px;
}

/* Mobile Menu Drawer */
.sp-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  z-index: 1090;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.sp-menu-overlay.is-active {
  opacity: 1;
  visibility: visible;
}

.sp-menu-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: white;
  z-index: 1100;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.sp-menu-drawer.is-active {
  transform: translateX(0);
}

.sp-menu-header {
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
}

.sp-menu-title {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
}

.sp-menu-close {
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--color-text-muted);
}

.sp-menu-body {
  padding: 20px 16px;
  overflow-y: auto;
}

.sp-nav-list .nav-item {
  border-bottom: 1px solid var(--color-border-subtle);
}

.sp-nav-list .nav-link {
  display: block;
  padding: 14px 16px;
  font-weight: 600;
  color: var(--color-text-main);
  border-radius: var(--radius-sm);
}

.sp-nav-list .nav-link:active {
  background: var(--color-primary-subtle);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: 60px 0 30px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 30px;
}

.footer-logo {
  color: white;
  font-size: 1.2rem;
  font-weight: 700;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-legal-links a {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.footer-legal-links a:hover {
  color: white;
}

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

.footer-copyright {
  font-size: 0.8rem;
  color: #64748b;
}

/* ==========================================================================
   Floating Back-to-Top Button
   ========================================================================== */
.pagetop-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  border: none;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: 900;
}

.pagetop-btn.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.pagetop-btn:hover {
  background: var(--color-accent-blue);
  transform: translateY(-3px);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 960px) {
  .nav-desktop {
    display: none;
  }

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

  .pagetop-btn {
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 640px) {
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary-line, .btn-secondary-contact {
    width: 100%;
    justify-content: center;
  }

  .form-row {
    flex-direction: column;
    gap: 12px;
  }

  .contact-form-wrapper {
    padding: 24px 16px;
  }
}