/*
  ============================================
  株式会社周栄 - メインスタイルシート
  Modern, Minimalist Design for 2025
  ============================================
*/

/* ============================================
   CSS Variables - Color Themes
   ============================================ */
:root {
  /* Light Theme Colors */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-alt: #F1F5F9;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: #DBEAFE;
  --secondary: #10B981;
  --accent: #F59E0B;
  --border: #E2E8F0;
  --shadow: rgba(15, 23, 42, 0.08);
  --shadow-lg: rgba(15, 23, 42, 0.15);

  /* Spacing */
  --container-width: 1200px;
  --section-padding: 5rem;
  --card-padding: 2rem;

  /* Typography */
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "ヒラギノ角ゴ ProN W3", Meiryo, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* ============================================
   Utilities
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

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

.mobile-break {
  display: none;
}

/* Focus Styles for Accessibility */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================
   Section Header
   ============================================ */
.section__header {
  text-align: center;
  margin-bottom: 3rem;
}

.section__badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--primary-light);
  color: var(--primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.section__title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn--primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn--primary:hover,
.btn--primary:focus {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
}

.btn--secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}

.btn--secondary:hover,
.btn--secondary:focus {
  border-color: var(--primary);
  color: var(--primary);
}

.btn--large {
  padding: 1rem 2rem;
  font-size: var(--font-size-lg);
}

.btn--full {
  width: 100%;
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--card-padding);
  box-shadow: 0 1px 3px var(--shadow);
  transition: all var(--transition-base);
  height: 100%;
}

.card:hover {
  box-shadow: 0 8px 24px var(--shadow-lg);
  transform: translateY(-4px);
}

.card__icon {
  width: 4rem;
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
  color: var(--primary);
  background: var(--primary-light);
}

.card__icon--primary {
  color: var(--primary);
  background: var(--primary-light);
}

.card__icon--secondary {
  color: var(--secondary);
  background: rgba(16, 185, 129, 0.1);
}

.card__icon--accent {
  color: var(--accent);
  background: rgba(245, 158, 11, 0.1);
}

.card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.card__text {
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.card__list {
  list-style: none;
  padding: 0;
}

.card__list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.card__list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
}

/* ============================================
   Header
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition-base);
}

.header--scrolled {
  box-shadow: 0 4px 12px var(--shadow);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

/* Logo */
.logo {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.logo__text {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
}

.logo__sub {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  font-weight: 500;
}

/* Navigation */
.nav__list {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-base);
  position: relative;
}

.nav__link:hover,
.nav__link:focus {
  color: var(--primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -0.25rem;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.nav__link:hover::after {
  transform: scaleX(1);
}

/* Mobile Menu Toggle */
.nav__toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem;
}

.nav__toggle-icon,
.nav__toggle-icon::before,
.nav__toggle-icon::after {
  display: block;
  width: 1.5rem;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-base);
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  display: flex;
  align-items: center;
  padding: 8rem 0 6rem;
  position: relative;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero__content {
  animation: fadeInUp 0.8s ease;
}

.hero__badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--primary-light);
  color: var(--primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__image {
  animation: fadeInRight 0.8s ease 0.2s both;
  position: relative;
}

.hero__image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 60px var(--shadow-lg);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  animation: bounce 2s infinite;
}

.scroll-indicator__text {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ============================================
   About Section
   ============================================ */
.about__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card--feature {
  text-align: center;
  padding: 2.5rem;
}

.card--feature .card__icon {
  margin: 0 auto 1.5rem;
}

/* Company Info */
.company-info {
  margin-top: 4rem;
}

.company-info__card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: 0 4px 12px var(--shadow);
  border: 2px solid var(--border);
}

.company-info__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2rem;
  text-align: center;
  padding-bottom: 1rem;
  border-bottom: 3px solid var(--primary);
}

.company-info__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.company-info__item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.company-info__label {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.company-info__value {
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  font-weight: 500;
}

/* ============================================
   Services Section
   ============================================ */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card--service {
  border: 1px solid var(--border);
}

/* ============================================
   Portfolio Section
   ============================================ */
.portfolio__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card--portfolio {
  padding: 0;
  overflow: hidden;
}

.card__image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card--portfolio:hover .card__image img {
  transform: scale(1.05);
}

.card__body {
  padding: 1.5rem;
}

.card__category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--primary-light);
  color: var(--primary);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

/* ============================================
   Testimonials Section
   ============================================ */
.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card--testimonial {
  position: relative;
  padding: 2rem;
}

.card__quote {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.card__author {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.card__author-name {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.card__author-title {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ============================================
   Contact Section
   ============================================ */
.contact__grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
}

/* Form Styles */
.form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form__label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.form__required {
  color: #EF4444;
}

.form__input,
.form__textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: all var(--transition-base);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

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

/* Info Card */
.info-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: 2rem;
  height: fit-content;
}

.info-card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.info-card__item {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.info-card__item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.info-card__icon {
  flex-shrink: 0;
  color: var(--primary);
}

.info-card__content strong {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.info-card__content p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

.info-card__content a {
  color: var(--primary);
  transition: color var(--transition-base);
}

.info-card__content a:hover {
  color: var(--primary-hover);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.logo--footer {
  flex-direction: column;
  align-items: flex-start;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.footer__text {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.footer__title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer__list a {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  transition: color var(--transition-base);
}

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

.footer__list li {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

/* Social Links */
.social {
  display: flex;
  gap: 1rem;
}

.social__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-alt);
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

.social__link:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

/* Footer Bottom */
.footer__bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: white;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-hover);
  transform: translateY(-4px);
}

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

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

@keyframes bounce {
  0%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(-10px);
  }
}

/* Fade in on scroll (applied by JS) */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

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

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet */
@media (max-width: 768px) {
  :root {
    --section-padding: 3rem;
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
  }

  /* Navigation */
  .nav__toggle {
    display: flex;
  }

  .nav__list {
    position: fixed;
    top: 4.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: 0 8px 16px var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-base);
  }

  .nav__list.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  /* Hero */
  .hero__container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero__image {
    order: -1;
  }

  .hero__title {
    font-size: var(--font-size-4xl);
  }

  .hero__actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .mobile-break {
    display: inline;
  }

  /* Grids */
  .about__grid,
  .services__grid,
  .portfolio__grid,
  .testimonials__grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .company-info__grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .company-info__card {
    padding: 2rem;
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

/* Mobile */
@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .hero__title {
    font-size: var(--font-size-3xl);
  }

  .section__title {
    font-size: var(--font-size-3xl);
  }

  .footer__grid {
    grid-template-columns: 1fr;
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 2.5rem;
    height: 2.5rem;
  }
}

/* Large Desktop */
@media (min-width: 1440px) {
  :root {
    --container-width: 1320px;
    --font-size-5xl: 3.5rem;
  }
}