/* ===== Design tokens ===== */
:root {
  --ink: #15243b;          /* 深い紺：信頼感 */
  --ink-soft: #3a4a63;
  --accent: #d4453b;       /* 台湾を想起させる赤 */
  --accent-dark: #b5362d;
  --bg: #ffffff;
  --bg-alt: #f5f6f8;
  --bg-band: #15243b;
  --border: #e4e7ec;
  --muted: #6b7686;
  --white: #ffffff;

  --font: "Zen Kaku Gothic New", "Noto Sans JP", -apple-system, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;

  --header-h: 72px;
  --maxw: 1120px;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(21, 36, 59, 0.08);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

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

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.85;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ===== Layout ===== */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }
.center { text-align: center; }

.section { padding: clamp(64px, 11vw, 120px) 0; }
.section-alt { background: var(--bg-alt); }

.section-eyebrow {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 14px;
}
.section-eyebrow.light { color: #ffb4ae; }

.section-title {
  font-size: clamp(1.6rem, 4.2vw, 2.4rem); font-weight: 700;
  line-height: 1.4; letter-spacing: 0.01em; margin-bottom: 28px;
}
.section-title.light { color: var(--white); }

.section-sub { color: var(--muted); margin: -14px auto 48px; max-width: 620px; }

p { margin-bottom: 1.1em; }
p:last-child { margin-bottom: 0; }

/* ===== Header ===== */
.site-header {
  position: fixed; inset: 0 0 auto 0; height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; z-index: 1000;
  background: rgba(255,255,255,0.82); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.site-header.scrolled { border-color: var(--border); box-shadow: 0 2px 20px rgba(21,36,59,0.05); }

.logo { font-weight: 700; font-size: 1.12rem; letter-spacing: 0.02em; color: var(--ink); }
.logo-flag { margin-left: 2px; }

.main-nav ul { list-style: none; display: flex; align-items: center; gap: 30px; }
.main-nav a { font-size: 0.92rem; font-weight: 500; color: var(--ink-soft); transition: color 0.2s; position: relative; }
.main-nav a:not(.nav-cta)::after {
  content: ''; position: absolute; left: 0; bottom: -6px; height: 2px; width: 0;
  background: var(--accent); transition: width 0.25s var(--ease);
}
.main-nav a:not(.nav-cta):hover { color: var(--ink); }
.main-nav a:not(.nav-cta):hover::after { width: 100%; }

.nav-cta {
  background: var(--accent); color: var(--white) !important; padding: 9px 20px;
  border-radius: 999px; font-weight: 700; transition: background 0.2s, transform 0.2s;
}
.nav-cta:hover { background: var(--accent-dark); transform: translateY(-1px); }

.menu-toggle {
  display: none; flex-direction: column; gap: 5px; background: none; border: none;
  cursor: pointer; padding: 8px; z-index: 1100;
}
.menu-toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform 0.3s, opacity 0.3s; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100svh; display: flex; align-items: center;
  justify-content: center; text-align: center; padding: var(--header-h) 24px 60px;
  overflow: hidden; color: var(--white);
}
.hero-bg {
  position: absolute; inset: 0; z-index: -2;
  background:
    radial-gradient(circle at 78% 18%, rgba(212,69,59,0.55), transparent 45%),
    radial-gradient(circle at 12% 88%, rgba(40,76,140,0.55), transparent 50%),
    linear-gradient(135deg, #15243b 0%, #1d3354 55%, #24324d 100%);
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 22px 22px;
}
.hero-inner { max-width: 760px; }
.hero-eyebrow {
  display: inline-block; font-size: 0.82rem; font-weight: 500; letter-spacing: 0.18em;
  color: #ffd0cb; border: 1px solid rgba(255,255,255,0.3); padding: 6px 16px;
  border-radius: 999px; margin-bottom: 28px;
}
.hero h1 {
  font-size: clamp(2.2rem, 7vw, 4rem); font-weight: 700; line-height: 1.3;
  letter-spacing: 0.01em; margin-bottom: 26px;
}
.hero-lead { font-size: clamp(1rem, 2.4vw, 1.2rem); color: rgba(255,255,255,0.9); max-width: 600px; margin: 0 auto 40px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.scroll-cue {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  width: 22px; height: 36px; border: 2px solid rgba(255,255,255,0.5); border-radius: 12px;
}
.scroll-cue::before {
  content: ''; position: absolute; left: 50%; top: 7px; width: 3px; height: 7px;
  background: rgba(255,255,255,0.8); border-radius: 2px; transform: translateX(-50%);
  animation: scrolldot 1.6s infinite;
}
@keyframes scrolldot { 0% { opacity: 0; transform: translate(-50%,0); } 40% { opacity: 1; } 80%,100% { opacity: 0; transform: translate(-50%,10px); } }

/* ===== Buttons ===== */
.btn {
  display: inline-block; padding: 14px 32px; border-radius: 999px; font-weight: 700;
  font-size: 0.95rem; cursor: pointer; transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}
.btn-primary { background: var(--accent); color: var(--white); box-shadow: 0 8px 22px rgba(212,69,59,0.32); }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); }
.btn-ghost { background: rgba(255,255,255,0.08); color: var(--white); border: 1px solid rgba(255,255,255,0.45); }
.btn-ghost:hover { background: rgba(255,255,255,0.16); transform: translateY(-2px); }

/* ===== About list ===== */
.about-list {
  list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 28px;
  max-width: 760px; margin: 48px auto 0;
}
.about-list li {
  position: relative; padding-left: 28px; color: var(--ink-soft); font-size: 0.96rem;
}
.about-list li::before {
  content: ''; position: absolute; left: 0; top: 0.62em; width: 14px; height: 8px;
  border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}

/* ===== Grids ===== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-top: 12px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }

/* Service cards */
.card-service {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 38px 30px; transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.card-service:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.card-icon {
  width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(135deg, #fde8e6, #fbd5d1); color: var(--accent); margin-bottom: 22px;
}
.card-icon svg { width: 28px; height: 28px; }
.card-service h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.card-service p { color: var(--muted); font-size: 0.95rem; }

/* Steps（進出3段階） */
.steps-grid { margin-top: 28px; }
.step-card {
  position: relative; background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 44px 30px 30px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.step-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.step-no {
  position: absolute; top: -24px; left: 30px; width: 58px; height: 58px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700; font-size: 1.6rem;
  display: grid; place-items: center; box-shadow: 0 6px 16px rgba(212,69,59,0.32);
}
.step-card h3 { font-size: 1.25rem; font-weight: 700; margin: 6px 0 12px; }
.step-card h3 small { display: block; font-size: 0.85rem; color: var(--muted); font-weight: 500; margin-top: 4px; }
.step-card p { color: var(--muted); font-size: 0.95rem; }
.step-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.step-tags span { font-size: 0.78rem; font-weight: 500; color: var(--accent-dark); background: #fdecea; padding: 5px 12px; border-radius: 999px; }

/* Capability tags */
.cap-grid { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; max-width: 860px; margin: 0 auto 52px; }
.cap-grid span {
  font-size: 0.92rem; font-weight: 500; color: var(--ink); background: var(--bg-alt);
  border: 1px solid var(--border); padding: 10px 18px; border-radius: 999px;
}

/* Flagship case */
.flagship {
  background: var(--white); border: 1px solid var(--border); border-left: 4px solid var(--accent);
  border-radius: var(--radius); padding: 34px 36px; box-shadow: var(--shadow); margin-bottom: 52px;
}
.flagship .work-tag { font-size: 1rem; }
.flagship p { color: var(--ink-soft); margin-bottom: 18px; }
.flagship-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 28px; }
.flagship-list li { position: relative; padding-left: 26px; font-size: 0.93rem; color: var(--ink-soft); }
.flagship-list li::before { content: ''; position: absolute; left: 0; top: 0.5em; width: 12px; height: 7px; border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(-45deg); }
@media (max-width: 600px) { .flagship-list { grid-template-columns: 1fr; } }

.works-sub { text-align: center; font-size: 1.1rem; font-weight: 700; color: var(--ink-soft); margin-bottom: 28px; }

/* Work cards */
.works-grid { margin-top: 12px; }
.card-work {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  border-left: 4px solid var(--accent); padding: 28px 26px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.card-work:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.work-tag {
  display: inline-block; font-weight: 700; font-size: 0.92rem; color: var(--ink);
  margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px dashed var(--border); width: 100%;
}
.card-work p { color: var(--muted); font-size: 0.92rem; }

/* ===== Volunteer band ===== */
.band { background: var(--bg-band); padding: clamp(60px, 9vw, 96px) 0; position: relative; overflow: hidden; }
.band::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 85% 30%, rgba(212,69,59,0.35), transparent 50%);
}
.band .container { position: relative; }
.band-text { color: rgba(255,255,255,0.86); font-size: 1.02rem; }

/* ===== Tools ===== */
.tools-grid { margin-top: 12px; }
.card-tool {
  display: block; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 34px 32px; transition: transform 0.3s var(--ease), box-shadow 0.3s, border-color 0.3s;
}
.card-tool:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--accent); }
.card-tool h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 10px; color: var(--ink); }
.card-tool p { color: var(--muted); font-size: 0.95rem; }

/* ===== Contact form ===== */
.contact-form { display: flex; flex-direction: column; gap: 20px; max-width: 620px; margin: 0 auto; }
.form-group { display: flex; flex-direction: column; text-align: left; }
.form-group label { font-size: 0.88rem; font-weight: 500; color: var(--ink-soft); margin-bottom: 8px; }
.form-group input, .form-group textarea {
  width: 100%; padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px;
  font-family: inherit; font-size: 1rem; color: var(--ink); background: var(--white);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(212,69,59,0.12);
}
.form-group textarea { min-height: 150px; resize: vertical; }
.contact-form .btn { align-self: center; margin-top: 8px; min-width: 200px; border: none; }

/* ===== Footer ===== */
.site-footer { background: #0f1a2b; color: rgba(255,255,255,0.75); padding: 64px 0 0; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; align-items: start; }
.site-footer .logo { color: var(--white); font-size: 1.2rem; }
.footer-tagline { color: rgba(255,255,255,0.6); font-size: 0.9rem; margin-top: 12px; }
.footer-links { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 0.92rem; color: rgba(255,255,255,0.75); transition: color 0.2s; }
.footer-links a:hover { color: var(--white); }
.social-label { display: block; font-size: 0.8rem; letter-spacing: 0.16em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: 16px; }
.footer-social ul { list-style: none; display: flex; gap: 14px; }
.footer-social a {
  width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center;
  background: rgba(255,255,255,0.08); color: var(--white); transition: background 0.2s, transform 0.2s;
}
.footer-social a:hover { background: var(--accent); transform: translateY(-3px); }
.footer-social svg { width: 20px; height: 20px; }
.footer-bottom {
  margin-top: 56px; border-top: 1px solid rgba(255,255,255,0.1); padding: 22px 0;
  text-align: center; font-size: 0.82rem; color: rgba(255,255,255,0.5);
}

/* ===== Reveal animation ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .scroll-cue::before { animation: none; }
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .grid-3 { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 720px) {
  .menu-toggle { display: flex; }
  /* すりガラス効果を切る：これが無いと中のメニュー(fixed)がヘッダー内に閉じ込められ全画面表示できない */
  .site-header,
  .site-header.scrolled { -webkit-backdrop-filter: none; backdrop-filter: none; background: rgba(255, 255, 255, 0.95); }
  .main-nav {
    position: fixed; inset: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(8px);
    display: flex; flex-direction: column; align-items: center; justify-content: flex-start;
    overflow-y: auto; -webkit-overflow-scrolling: touch;
    padding: calc(var(--header-h) + 28px) 24px 48px; box-sizing: border-box;
    opacity: 0; pointer-events: none; transition: opacity 0.3s var(--ease);
  }
  .main-nav.open { opacity: 1; pointer-events: auto; }
  .main-nav ul {
    display: flex; flex-direction: column; align-items: center; gap: 26px; width: 100%;
  }
  .main-nav a { font-size: 1.2rem; }
  .nav-cta { padding: 12px 28px; }

  .grid-2 { grid-template-columns: 1fr; }
  .about-list { grid-template-columns: 1fr; max-width: 420px; }
  .hero-actions { flex-direction: column; align-items: stretch; max-width: 320px; margin: 40px auto 0; }
  .section { padding: 72px 0; }
}