/* ============================================
   合同会社 斉シン コーポレートサイト
   ============================================ */

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

:root {
  --color-navy: #1B2A6E;
  --color-navy-dark: #0F1B4A;
  --color-navy-light: #2A3F8F;
  --color-accent: #C0392B;
  --color-accent-light: #E74C3C;
  --color-white: #ffffff;
  --color-bg: #ffffff;
  --color-bg-alt: #F7F8FC;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #E0E4EF;
  --font-sans: 'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;
  --header-height: 80px;
  --section-padding: 100px;
  --container-width: 1100px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

/* --- Container --- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  text-align: center;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(192, 57, 43, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-navy);
  border-color: var(--color-navy);
}

.btn-outline:hover {
  background: var(--color-navy);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(27, 42, 110, 0.2);
}

/* --- Section --- */
.section {
  padding: var(--section-padding) 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-navy-dark);
  letter-spacing: 0.05em;
}

.section-description {
  margin-top: 16px;
  color: var(--color-text-light);
  font-size: 15px;
}

/* ============================================
   Header
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-image {
  height: 72px;
  width: auto;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.03em;
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-navy);
  transition: width var(--transition);
}

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

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

/* Hamburger */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-navy-dark);
  position: absolute;
  left: 0;
  transition: all var(--transition);
}

.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.hamburger span:nth-child(3) { bottom: 0; }

.hamburger.active span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url('../mv.jpg') center center / cover no-repeat;
  z-index: 0;
}

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(15, 27, 74, 0.15);
}

.hero-bg::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to top, rgba(15, 27, 74, 0.3), transparent);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.4;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.8);
  line-height: 2;
  margin-bottom: 40px;
  font-weight: 300;
}

.hero .btn-primary {
  padding: 16px 48px;
  font-size: 16px;
}

.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  z-index: 3;
  line-height: 0;
}

.hero-wave svg {
  width: 100%;
  height: 80px;
}

/* ============================================
   About
   ============================================ */
.about {
  background: var(--color-bg);
}

.about-content {
  max-width: 760px;
  margin: 0 auto;
}

.about-text p {
  margin-bottom: 20px;
  font-size: 15px;
  line-height: 2;
  color: var(--color-text);
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Products
   ============================================ */
.products {
  background: var(--color-bg-alt);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.product-card {
  background: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  transition: all var(--transition);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.product-image {
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-image-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  letter-spacing: 0.1em;
}

.product-icon {
  width: 56px;
  height: 56px;
  color: rgba(255, 255, 255, 0.7);
}

.product-body {
  padding: 28px 24px;
}

.product-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-navy-dark);
  margin-bottom: 12px;
}

.product-description {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.product-body .btn {
  padding: 10px 24px;
  font-size: 13px;
}

/* ============================================
   Features
   ============================================ */
.features {
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  color: var(--color-navy);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-navy-dark);
  margin-bottom: 16px;
}

.feature-description {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.9;
}

/* ============================================
   Company
   ============================================ */
.company {
  background: var(--color-bg-alt);
}

.company-table-wrapper {
  max-width: 700px;
  margin: 0 auto;
}

.company-table {
  width: 100%;
  border-collapse: collapse;
}

.company-table th,
.company-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  font-size: 15px;
  vertical-align: top;
}

.company-table th {
  width: 140px;
  font-weight: 500;
  color: var(--color-navy-dark);
  white-space: nowrap;
}

.company-table td {
  color: var(--color-text);
}

.company-table tr:last-child th,
.company-table tr:last-child td {
  border-bottom: none;
}

/* ============================================
   Contact
   ============================================ */
.contact {
  background: var(--color-bg);
}

.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-description {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 2;
  margin-bottom: 32px;
}

.contact-info {
  margin-bottom: 40px;
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
  color: var(--color-navy);
  font-weight: 500;
}

.contact-icon {
  width: 24px;
  height: 24px;
  color: var(--color-navy);
}

/* --- Contact Form --- */
.contact-form {
  max-width: 600px;
  margin: 40px auto 0;
  text-align: left;
}

.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-navy-dark);
  margin-bottom: 8px;
}

.form-required {
  font-size: 12px;
  color: var(--color-accent);
  margin-left: 4px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: border-color var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-navy);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23666' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-submit {
  display: block;
  width: 100%;
  padding: 16px;
  font-size: 16px;
  margin-top: 8px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: #3E2723;
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 0;
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo-image {
  height: 32px;
  width: auto;
  filter: brightness(0) invert(1);
}

.footer-tagline {
  margin-top: 8px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-nav {
  display: flex;
  gap: 24px;
}

.footer-nav a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--color-white);
}

.footer-bottom {
  text-align: center;
  padding: 24px 0;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   Scroll Animations
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 900px) {
  :root {
    --section-padding: 72px;
  }

  .products-grid {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin: 0 auto;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    max-width: 480px;
    margin: 0 auto;
  }

  .footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
  }

  .footer-nav {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .hamburger {
    display: block;
  }

  .nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: var(--color-white);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    transition: transform var(--transition);
    padding: 100px 32px 40px;
    z-index: 999;
  }

  .nav.open {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: 16px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-link::after {
    display: none;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 14px;
  }

  .hero-wave svg {
    height: 48px;
  }

  .section-title {
    font-size: 26px;
  }

  .company-table th,
  .company-table td {
    display: block;
    padding: 12px 0;
  }

  .company-table th {
    padding-bottom: 4px;
    border-bottom: none;
  }

  .company-table tr {
    border-bottom: 1px solid var(--color-border);
  }

  .company-table tr:last-child {
    border-bottom: none;
  }

  .contact-description br {
    display: none;
  }
}

/* Overlay for mobile menu */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition);
}

.nav-overlay.active {
  display: block;
  opacity: 1;
}