/* twin net - Main Stylesheet */

:root {
  --color-primary: #1a5f7a;
  --color-primary-dark: #134559;
  --color-primary-light: #2d8cb8;
  --color-accent: #57c5b6;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f8fa;
  --color-border: #e0e6eb;
  --font-main: 'Noto Sans JP', sans-serif;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  line-height: 1.8;
  background: var(--color-bg);
}

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

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

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-bg);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.logo:hover {
  color: var(--color-primary-dark);
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.main-nav a {
  display: block;
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* Hero */
.hero {
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  background-image: url('https://images.unsplash.com/photo-1558618666-fcd25c85cd64?w=1600&q=80');
  background-size: cover;
  background-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26, 95, 122, 0.85) 0%, rgba(45, 140, 184, 0.75) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 4rem 1.5rem;
}

.hero-lead {
  font-size: 1.25rem;
  color: #fff;
  font-weight: 500;
  max-width: 700px;
  line-height: 1.9;
}

.hero-lead a {
  color: var(--color-accent);
  text-decoration: underline;
}

.hero-lead a:hover {
  color: #fff;
}

/* Carousel */
.carousel-section {
  padding: 4rem 0;
  background: var(--color-bg-alt);
}

.carousel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  background: var(--color-bg);
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease;
}

.carousel-slide {
  min-width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.slide-image {
  min-height: 320px;
  background-size: cover;
  background-position: center;
}

.slide-body {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-body h2 {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.slide-body p {
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.9);
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition);
  z-index: 10;
}

.carousel-btn:hover {
  background: #fff;
}

.carousel-prev { left: 1rem; }
.carousel-next { right: 1rem; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--color-bg);
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: var(--color-border);
  cursor: pointer;
  transition: background var(--transition);
}

.carousel-dot.active {
  background: var(--color-primary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font-main);
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-align: center;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}

.btn-secondary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-secondary:hover {
  background: #45b0a1;
  border-color: #45b0a1;
  color: #fff;
}

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

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-block {
  width: 100%;
}

/* About Section */
.about-section {
  padding: 5rem 0;
}

.section-title {
  font-size: 1.75rem;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 1.5rem;
}

.section-text {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 2rem;
  color: var(--color-text-light);
}

/* Cards */
.cards-section {
  padding: 3rem 0 5rem;
  background: var(--color-bg-alt);
}

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

.card {
  background: var(--color-bg);
  padding: 2.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.card p {
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
  text-align: left;
}

/* Page layouts */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  padding: 3rem 0;
  text-align: center;
}

.page-hero h1 {
  color: #fff;
  font-size: 2rem;
}

.page-content {
  padding: 3rem 0 5rem;
}

.content-narrow {
  max-width: 760px;
}

.content-narrow p {
  margin-bottom: 1.25rem;
  color: var(--color-text-light);
}

.content-narrow h2 {
  font-size: 1.35rem;
  color: var(--color-primary);
  margin: 2rem 0 1rem;
}

.page-banner {
  height: 240px;
  border-radius: var(--radius);
  background-size: cover;
  background-position: center;
  margin-bottom: 2rem;
}

.styled-list {
  list-style: none;
  margin-bottom: 1.5rem;
}

.styled-list li {
  padding: 0.5rem 0 0.5rem 1.5rem;
  position: relative;
  color: var(--color-text-light);
}

.styled-list li::before {
  content: '●';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.6rem;
  top: 0.85rem;
}

/* Consulting page */
.app-card {
  background: var(--color-bg-alt);
  padding: 2rem;
  border-radius: var(--radius);
  text-align: center;
  margin: 2rem 0;
  border: 1px solid var(--color-border);
}

.app-card h2 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.app-subtitle {
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
}

.feature-list {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.feature-item .feature-image {
  height: 200px;
  border-radius: var(--radius);
  background-size: cover;
  background-position: center;
  margin-bottom: 1rem;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.skill-item {
  background: var(--color-bg-alt);
  padding: 1.5rem;
  border-radius: var(--radius);
  border-left: 4px solid var(--color-accent);
}

.skill-item h3 {
  color: var(--color-primary);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.skill-item p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin: 0;
}

.info-box {
  background: #fff8e6;
  border: 1px solid #ffe082;
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 2rem 0;
}

.info-box p {
  margin: 0;
  font-size: 0.9rem;
}

/* Contact form */
.contact-form {
  margin-top: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--color-text);
}

.required {
  color: #e53935;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-main);
  font-size: 1rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-success {
  background: #e8f5e9;
  border: 1px solid #a5d6a7;
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 2rem;
  text-align: center;
}

.form-success p {
  color: #2e7d32;
  margin: 0;
}

/* Legal */
.legal-content h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
}

/* Footer */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.85);
  padding-top: 3rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-bottom: 2rem;
}

.footer-brand h2 {
  color: #fff;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.footer-brand h3 {
  font-size: 0.9rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.footer-brand ul {
  list-style: none;
}

.footer-brand li {
  font-size: 0.9rem;
  padding: 0.15rem 0;
}

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

.footer-links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 1.25rem 0;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  text-align: center;
}

/* Responsive */
@media (max-width: 900px) {
  .carousel-slide {
    grid-template-columns: 1fr;
  }

  .slide-image {
    min-height: 200px;
  }

  .cards-grid,
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  .main-nav.open {
    max-height: 500px;
  }

  .main-nav ul {
    flex-direction: column;
    padding: 1rem;
  }

  .main-nav a {
    padding: 0.75rem 1rem;
  }

  .hero-lead {
    font-size: 1.05rem;
  }

  .carousel-btn {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .slide-body {
    padding: 1.5rem;
  }
}