/* ========================================
   jerisites -- Styles
   Dark, modern, clean theme
   ======================================== */

:root {
  --bg: #0F1626;
  --bg-alt: #1A2332;
  --bg-accent: #1E2A3A;
  --accent: #4A90D9;
  --accent-hover: #5BA0E9;
  --heading: #FFFFFF;
  --body: #B0B8C8;
  --body-light: #8892A4;
  --emphasis: #F0F0F0;
  --white: #FFFFFF;
  --border: #2A3444;
  --radius: 12px;
  --shadow: 0 2px 20px rgba(0,0,0,0.2);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.35);
  --max-w: 940px;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-sans: 'Noto Sans JP', system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  color: var(--heading);
  font-weight: 400;
  line-height: 1.3;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; display: block; }

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--accent);
  color: var(--white);
  padding: 8px 16px;
  border-radius: 6px;
  z-index: 200;
  font-size: 14px;
}
.skip-link:focus { top: 10px; }

/* Language visibility */
html.lang-en [data-lang="ja"] { display: none; }
html.lang-ja [data-lang="en"] { display: none; }

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

/* -- SECTION SPACING -- */
.section { padding: 100px 0; }
.section--alt { background: var(--bg-alt); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 { font-size: 2rem; letter-spacing: -0.02em; }

/* Subtle divider between sections */
.section + .section:not(.section--alt) { border-top: 1px solid var(--border); }
.section--alt + .section { border-top: none; }

/* ========================================
   NAVIGATION
   ======================================== */
.nav {
  position: sticky;
  top: 0;
  background: rgba(15, 22, 38, 0.92);
  backdrop-filter: blur(12px);
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav__logo {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 700;
  color: var(--heading);
  letter-spacing: -0.5px;
}
.nav__logo:hover { color: var(--heading); }

.nav__links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav__links a {
  color: var(--body);
  font-size: 15px;
  font-weight: 500;
}
.nav__links a:hover { color: var(--heading); }

.lang-toggle {
  background: none;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  padding: 5px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: background 0.2s, color 0.2s;
}
.lang-toggle:hover { background: var(--accent); color: var(--white); }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__hamburger span {
  width: 22px;
  height: 2px;
  background: var(--heading);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile overlay */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 72px 0 0 0;
  background: var(--bg);
  z-index: 99;
  padding: 48px 24px;
}
.mobile-menu.open { display: flex; flex-direction: column; gap: 28px; }
.mobile-menu a { font-size: 22px; color: var(--heading); font-weight: 500; }
.mobile-menu .lang-toggle { align-self: flex-start; margin-top: 8px; }

/* ========================================
   HERO
   ======================================== */
.hero {
  padding: 120px 0 100px;
  text-align: center;
  background: linear-gradient(rgba(15, 22, 38, 0.82), rgba(15, 22, 38, 0.88)), url('../images/hero-bg.jpg') center / cover no-repeat;
}
.hero h1 {
  font-size: 2.5rem;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
.hero__sub {
  font-size: 1.15rem;
  line-height: 1.8;
  max-width: 580px;
  margin: 0 auto 40px;
  color: var(--body);
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: 15px 40px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-sans);
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}
.btn:hover { background: var(--accent-hover); color: var(--white); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

/* ========================================
   ABOUT
   ======================================== */
#about {
  background: linear-gradient(rgba(15, 22, 38, 0.88), rgba(15, 22, 38, 0.92)), url('../images/about-bg.jpg') center / cover no-repeat;
}
.about__inner { display: flex; gap: 48px; align-items: flex-start; }

.avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 3px solid var(--accent);
  overflow: hidden;
  flex-shrink: 0;
}
.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about__text h2 { font-size: 1.75rem; margin-bottom: 24px; }
.about__text p { margin-bottom: 18px; }
.about__text p:last-child { margin-bottom: 0; }

/* ========================================
   SERVICES
   ======================================== */
.services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent);
  transition: box-shadow 0.25s, transform 0.25s;
}
.card:hover { box-shadow: 0 8px 30px rgba(74, 144, 217, 0.15); transform: translateY(-3px); }
.card h3 { font-size: 1.25rem; margin-bottom: 14px; }
.card p { color: var(--body); }

/* ========================================
   VALUE PROPS
   ======================================== */
.value__tagline {
  text-align: center;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--body);
  max-width: 520px;
  margin: -32px auto 52px;
}
.value__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.value-block {
  text-align: center;
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 36px 24px;
  border: 1px solid var(--border);
  transition: box-shadow 0.25s, transform 0.25s;
}
.value-block:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.value-block__icon {
  margin-bottom: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(74, 144, 217, 0.1);
  border: 1px solid rgba(74, 144, 217, 0.25);
}
.value-block__icon svg { stroke: var(--accent); width: 32px; height: 32px; }
.value-block h3 { font-size: 1.1rem; margin-bottom: 8px; }
.value-block p { font-size: 0.95rem; color: var(--body); max-width: 300px; margin: 0 auto; }

/* ========================================
   PORTFOLIO
   ======================================== */
.portfolio__sub {
  text-align: center;
  max-width: 560px;
  margin: -36px auto 52px;
  color: var(--body);
  font-size: 1.05rem;
}
.portfolio__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.project-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: box-shadow 0.25s, transform 0.25s;
  position: relative;
}
.project-card:hover { box-shadow: 0 8px 30px rgba(74, 144, 217, 0.15); transform: translateY(-4px); }

.project-screenshot-wrapper {
  position: relative;
  overflow: hidden;
}
.project-screenshot-wrapper::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(15, 22, 38, 0.5);
  opacity: 0;
  transition: opacity 0.3s;
}
.project-card:hover .project-screenshot-wrapper::after { opacity: 1; }

.project-screenshot {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
  transition: transform 0.3s;
}
.project-card:hover .project-screenshot { transform: scale(1.05); }
.project-card__body { padding: 24px 28px 28px; }
.project-card__body h3 { font-size: 1.1rem; margin-bottom: 8px; }
.project-card__body p { font-size: 0.93rem; color: var(--body); margin-bottom: 14px; }
.project-link { font-size: 0.93rem; font-weight: 600; }

/* ========================================
   FOUNDING OFFER
   ======================================== */
#founding {
  background: linear-gradient(rgba(30, 42, 58, 0.9), rgba(30, 42, 58, 0.93)), url('../images/founding-bg.jpg') center / cover no-repeat;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.founding__content {
  max-width: 640px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.85;
}
.founding__content p { margin-bottom: 18px; }
.founding__content strong { color: var(--emphasis); }
.founding__cta { text-align: center; margin-top: 40px; }
.founding__cta .btn {
  box-shadow: 0 0 20px rgba(74, 144, 217, 0.3);
}
.founding__cta .btn:hover {
  box-shadow: 0 0 30px rgba(74, 144, 217, 0.5);
}

/* ========================================
   CONTACT
   ======================================== */
#contact {
  background: linear-gradient(rgba(26, 35, 50, 0.9), rgba(26, 35, 50, 0.93)), url('../images/contact-bg.jpg') center / cover no-repeat;
}
.contact__intro {
  text-align: center;
  max-width: 520px;
  margin: 0 auto 48px;
  color: var(--body);
  font-size: 1.05rem;
}
.contact__form {
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--emphasis);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--heading);
  background: var(--bg-alt);
  transition: border-color 0.2s;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--body-light);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.15);
}
.form-group textarea { min-height: 140px; resize: vertical; }
.contact__form .btn { align-self: flex-start; }

/* ========================================
   FOOTER
   ======================================== */
.footer {
  padding: 36px 0;
  border-top: 1px solid var(--border);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  color: var(--body-light);
}
.footer__links { display: flex; gap: 24px; list-style: none; }
.footer__links a { color: var(--body-light); font-size: 14px; }
.footer__links a:hover { color: var(--accent); }

/* ========================================
   RESPONSIVE -- Tablet (768px+)
   ======================================== */
@media (min-width: 768px) {
  .section { padding: 120px 0; }
  .hero { padding: 140px 0 120px; }
  .hero h1 { font-size: 3rem; }
  .services__grid { grid-template-columns: 1fr 1fr; }
  .value__grid { grid-template-columns: 1fr 1fr; }
  .portfolio__grid { grid-template-columns: 1fr 1fr; }
}

/* ========================================
   RESPONSIVE -- Desktop (1024px+)
   ======================================== */
@media (min-width: 1024px) {
  .hero h1 { font-size: 3.4rem; }
  .hero { padding: 160px 0 130px; }
  .portfolio__grid { grid-template-columns: 1fr 1fr 1fr; }
  .section-header h2 { font-size: 2.2rem; }
}

/* ========================================
   RESPONSIVE -- Mobile (<768px)
   ======================================== */
@media (max-width: 767px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
  .about__inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .about__text h2 { text-align: center; }
  .hero h1 { font-size: 2rem; }
  .section { padding: 72px 0; }
  .hero { padding: 80px 0 64px; }
  .section-header { margin-bottom: 40px; }
}