:root {
  --orange: #F97316;
  --orange-light: #FED7AA;
  --orange-dark: #C2410C;
  --navy: #0F1B35;
  --navy-mid: #1E2D4F;
  --slate: #334155;
  --mid: #64748B;
  --light: #F1F5F9;
  --lighter: #F8FAFC;
  --white: #FFFFFF;
  --border: #E2E8F0;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(15,27,53,0.10);
  --shadow-lg: 0 8px 40px rgba(15,27,53,0.16);
  --font-body: 'Noto Sans JP', sans-serif;
  --font-display: 'Outfit', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--slate);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── HEADER ── */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(15,27,53,0.97);
  backdrop-filter: blur(10px);
  padding: 0 40px;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.logo-wrap {
  display: flex; align-items: center; gap: 8px; text-decoration: none;
}
.logo-suffix {
  font-family: var(--font-display);
  font-size: 15px; font-weight: 700;
  color: rgba(255,255,255,0.85);
  letter-spacing: 0.02em;
}
nav { display: flex; align-items: center; gap: 32px; }
nav a {
  font-size: 13px; font-weight: 500; color: rgba(255,255,255,0.7);
  text-decoration: none; letter-spacing: 0.02em; transition: color 0.2s;
}
nav a:hover { color: var(--white); }
.btn-nav {
  background: var(--orange); color: var(--white) !important;
  padding: 8px 20px; border-radius: 6px; font-weight: 600 !important;
  font-size: 13px !important; transition: background 0.2s, transform 0.15s !important;
}
.btn-nav:hover { background: var(--orange-dark) !important; transform: translateY(-1px); }

/* ── HERO ── */
#hero {
  min-height: 100vh;
  background: var(--navy);
  display: flex; align-items: center; justify-content: center;
  padding: 120px 40px 80px;
  position: relative; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(249,115,22,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 20% 80%, rgba(249,115,22,0.05) 0%, transparent 60%);
}
.hero-grid {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.04;
  background-image: linear-gradient(rgba(255,255,255,0.8) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,0.8) 1px, transparent 1px);
  background-size: 48px 48px;
}
.hero-inner {
  max-width: 1100px; width: 100%; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
  position: relative; z-index: 2;
}
.hero-title {
  font-size: clamp(32px, 4vw, 52px); font-weight: 900;
  color: var(--white); line-height: 1.2;
  letter-spacing: -0.02em; margin-bottom: 20px;
  animation: fadeUp 0.6s 0.1s ease both;
}
.hero-title em { color: var(--orange); font-style: normal; }
.hero-sub {
  font-size: 16px; color: rgba(255,255,255,0.65); line-height: 1.8;
  margin-bottom: 36px; font-weight: 400;
  animation: fadeUp 0.6s 0.2s ease both;
}
.hero-cta {
  display: flex; gap: 14px; flex-wrap: wrap;
  animation: fadeUp 0.6s 0.3s ease both;
}
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--orange); color: var(--white);
  padding: 14px 28px; border-radius: 8px;
  font-size: 15px; font-weight: 700; text-decoration: none;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(249,115,22,0.35);
}
.btn-primary:hover { background: var(--orange-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(249,115,22,0.45); }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent; color: rgba(255,255,255,0.8);
  padding: 14px 28px; border-radius: 8px; border: 1px solid rgba(255,255,255,0.2);
  font-size: 15px; font-weight: 500; text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.btn-secondary:hover { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.4); color: var(--white); }

/* Hero visual */
.hero-visual { animation: fadeUp 0.7s 0.35s ease both; }
.hero-card-stack { display: flex; flex-direction: column; gap: 12px; }
.hc {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: flex; align-items: center; gap: 14px;
  transition: transform 0.3s, border-color 0.3s;
}
.hc:hover { transform: translateX(6px); border-color: rgba(249,115,22,0.4); }
.hc-icon {
  width: 40px; height: 40px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.hc-icon.orange { background: rgba(249,115,22,0.15); }
.hc-icon.blue   { background: rgba(99,179,237,0.12); }
.hc-icon.green  { background: rgba(52,211,153,0.12); }
.hc-icon.purple { background: rgba(167,139,250,0.12); }
.hc-label { font-size: 11px; color: rgba(255,255,255,0.4); font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; }
.hc-title { font-size: 14px; color: var(--white); font-weight: 600; margin-top: 2px; }
.hc-status { margin-left: auto; font-size: 11px; font-weight: 600; padding: 3px 10px; border-radius: 100px; }
.hc-status.active  { background: rgba(52,211,153,0.15);  color: #34D399; }
.hc-status.pending { background: rgba(251,191,36,0.15);  color: #FBBF24; }
.hc-status.done    { background: rgba(99,179,237,0.15);  color: #63B3ED; }

/* ── SECTION COMMON ── */
section { padding: 96px 40px; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-label {
  font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--orange); margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 3vw, 38px); font-weight: 900; color: var(--navy);
  line-height: 1.25; letter-spacing: -0.02em;
}
.section-sub { font-size: 16px; color: var(--mid); line-height: 1.8; margin-top: 14px; }
.section-head { margin-bottom: 56px; }

/* ── PROBLEMS ── */
#problems { background: var(--lighter); }
.problems-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.prob-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px; border: 1px solid var(--border);
  display: flex; gap: 16px; align-items: flex-start;
  transition: box-shadow 0.2s;
}
.prob-card:hover { box-shadow: var(--shadow); }
.prob-num {
  font-family: var(--font-display); font-size: 36px; font-weight: 800;
  color: var(--orange); opacity: 0.2; line-height: 1; flex-shrink: 0; min-width: 48px;
}
.prob-body h3 { font-size: 15px; font-weight: 700; color: var(--navy); margin-bottom: 6px; }
.prob-body p  { font-size: 13px; color: var(--mid); line-height: 1.7; }

/* ── OVERVIEW ── */
#overview { background: var(--navy); position: relative; overflow: hidden; }
#overview .section-title { color: var(--white); }
#overview .section-sub   { color: rgba(255,255,255,0.55); }
#overview .section-label { color: var(--orange); }
.overview-bg {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 60% 80% at 80% 50%, rgba(249,115,22,0.07) 0%, transparent 70%);
}
.overview-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.overview-points { display: flex; flex-direction: column; gap: 20px; }
.ov-point {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 20px; border-radius: var(--radius);
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  transition: border-color 0.2s, background 0.2s;
}
.ov-point:hover { border-color: rgba(249,115,22,0.3); background: rgba(249,115,22,0.04); }
.ov-icon { font-size: 22px; flex-shrink: 0; margin-top: 2px; }
.ov-text h3 { font-size: 15px; font-weight: 700; color: var(--white); margin-bottom: 4px; }
.ov-text p  { font-size: 13px; color: rgba(255,255,255,0.5); line-height: 1.7; }

/* ── FEATURES ── */
#features { background: var(--white); }
.features-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.feat-card {
  border-radius: var(--radius-lg); padding: 36px;
  border: 1px solid var(--border); background: var(--lighter);
  transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
  position: relative; overflow: hidden;
}
.feat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--orange-dark));
  transform: scaleX(0); transform-origin: left; transition: transform 0.3s;
}
.feat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--orange-light); }
.feat-card:hover::before { transform: scaleX(1); }
.feat-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: linear-gradient(135deg, rgba(249,115,22,0.12), rgba(249,115,22,0.06));
  border: 1px solid rgba(249,115,22,0.2);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 20px;
}
.feat-card h3 { font-size: 19px; font-weight: 800; color: var(--navy); margin-bottom: 10px; }
.feat-card p  { font-size: 14px; color: var(--mid); line-height: 1.8; }
.feat-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.feat-tag {
  font-size: 11px; font-weight: 600; color: var(--orange);
  background: rgba(249,115,22,0.08); border: 1px solid rgba(249,115,22,0.15);
  padding: 3px 10px; border-radius: 100px;
}

/* ── EFFECTS ── */
#effects { background: var(--lighter); }
.effects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.eff-card {
  background: var(--white); border-radius: var(--radius-lg); padding: 32px;
  border: 1px solid var(--border); text-align: center;
  transition: box-shadow 0.2s, transform 0.2s;
}
.eff-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.eff-num {
  font-family: var(--font-display); font-size: 52px; font-weight: 800;
  color: var(--orange); line-height: 1; letter-spacing: -0.03em;
}
.eff-unit  { font-size: 16px; font-weight: 700; }
.eff-label { font-size: 14px; color: var(--mid); margin-top: 10px; line-height: 1.6; }
.eff-icon  { font-size: 32px; margin-bottom: 12px; }

/* ── LINEUP ── */
#lineup { background: var(--white); }
.lineup-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.lineup-card {
  border-radius: var(--radius-lg); padding: 32px;
  border: 2px solid var(--border); transition: border-color 0.2s, box-shadow 0.2s;
}
.lineup-card.active { border-color: var(--orange); box-shadow: 0 0 0 4px rgba(249,115,22,0.1); }
.lineup-tag {
  font-size: 10px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 3px 10px; border-radius: 100px; display: inline-block; margin-bottom: 14px;
}
.lineup-tag.core      { background: rgba(99,179,237,0.1);  color: #3B82F6; }
.lineup-tag.partners  { background: rgba(52,211,153,0.1);  color: #10B981; }
.lineup-tag.suppliers { background: rgba(249,115,22,0.12); color: var(--orange); }
.lineup-card h3 { font-size: 18px; font-weight: 800; color: var(--navy); margin-bottom: 8px; }
.lineup-card p  { font-size: 13px; color: var(--mid); line-height: 1.7; }
.lineup-badge {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 11px; font-weight: 600; color: var(--orange);
  background: rgba(249,115,22,0.08); padding: 4px 10px; border-radius: 100px;
  margin-top: 14px;
}

/* ── STEPS ── */
#steps { background: var(--lighter); }
.steps-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.steps-row::before {
  content: ''; position: absolute; top: 40px; left: 12.5%; right: 12.5%;
  height: 2px; background: linear-gradient(90deg, var(--orange), var(--orange-dark));
  z-index: 0;
}
.step-item { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 0 16px; position: relative; z-index: 1; }
.step-dot {
  width: 80px; height: 80px; border-radius: 50%;
  background: linear-gradient(135deg, var(--orange), var(--orange-dark));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 22px; font-weight: 800; color: var(--white);
  margin-bottom: 20px; box-shadow: 0 4px 16px rgba(249,115,22,0.35);
}
.step-item h3 { font-size: 15px; font-weight: 800; color: var(--navy); margin-bottom: 6px; }
.step-item p  { font-size: 13px; color: var(--mid); line-height: 1.7; }

/* ── FAQ ── */
#faq { background: var(--white); }
.faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 720px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.faq-q {
  display: flex; align-items: center; gap: 14px; padding: 20px 24px;
  cursor: pointer; user-select: none;
  background: var(--white); transition: background 0.15s;
}
.faq-q:hover { background: var(--lighter); }
.faq-q-icon {
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--orange), var(--orange-dark));
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800; color: var(--white); flex-shrink: 0;
}
.faq-q-text { font-size: 14px; font-weight: 700; color: var(--navy); flex: 1; }
.faq-arrow  { color: var(--orange); font-size: 14px; transition: transform 0.25s; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-a {
  display: none; padding: 0 24px 20px 66px;
  font-size: 14px; color: var(--mid); line-height: 1.8;
}
.faq-item.open .faq-a { display: block; }

/* ── CONTACT ── */
#contact {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  text-align: center; position: relative; overflow: hidden;
}
#contact .section-title { color: var(--white); }
#contact .section-sub   { color: rgba(255,255,255,0.55); }
#contact .section-label { color: var(--orange); }
.contact-bg {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 60% 80% at 50% 0%, rgba(249,115,22,0.08) 0%, transparent 70%);
}

/* ── FOOTER ── */
footer {
  background: #080E1F; padding: 32px 40px;
  display: flex; align-items: center; justify-content: space-between;
}
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 12px; color: rgba(255,255,255,0.35); text-decoration: none; transition: color 0.2s; }
.footer-links a:hover { color: rgba(255,255,255,0.7); }
.footer-copy { font-size: 11px; color: rgba(255,255,255,0.25); }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  header { padding: 0 20px; }
  nav { display: none; }
  section { padding: 72px 24px; }
  .hero-inner       { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual      { display: none; }
  .problems-grid    { grid-template-columns: 1fr; }
  .overview-grid    { grid-template-columns: 1fr; gap: 40px; }
  .features-grid    { grid-template-columns: 1fr; }
  .effects-grid     { grid-template-columns: 1fr; }
  .lineup-grid      { grid-template-columns: 1fr; }
  .steps-row        { grid-template-columns: 1fr; }
  .steps-row::before { display: none; }
  footer { flex-direction: column; gap: 16px; text-align: center; }
}