:root {
  --ink: #18302c;
  --ink-strong: #10231f;
  --muted: #5c6f69;
  --paper: #f8fbf7;
  --surface: #ffffff;
  --surface-soft: #eef8ec;
  --line: #cedbd2;
  --green: #087f72;
  --green-dark: #075e56;
  --lime: #dff3d5;
  --blue: #2d6fcd;
  --orange: #e17d31;
  --shadow: 0 22px 64px rgba(30, 65, 55, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "Segoe UI", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  background: var(--paper);
  line-height: 1.75;
}
img { max-width: 100%; }
a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  transform: translateY(-150%);
  padding: 10px 14px;
  background: var(--ink-strong);
  color: #fff;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 66px;
  padding: 10px clamp(18px, 4vw, 54px);
  border-bottom: 1px solid rgba(206, 219, 210, 0.82);
  background: rgba(248, 251, 247, 0.92);
  backdrop-filter: blur(14px);
}
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; text-decoration: none; }
.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 5px;
  background: var(--ink-strong);
  color: #fff;
  font-family: Georgia, serif;
}
.site-nav { display: flex; align-items: center; gap: clamp(12px, 2vw, 26px); font-size: 14px; font-weight: 700; }
.site-nav a { text-decoration: none; }
.site-nav a:not(.nav-cta):hover { color: var(--green); }
.nav-cta { min-height: 38px; display: inline-flex; align-items: center; border-radius: 7px; padding: 0 14px; background: var(--ink-strong); color: #fff; }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(360px, 0.8fr) minmax(540px, 1.2fr);
  gap: clamp(38px, 6vw, 88px);
  align-items: center;
  min-height: calc(100vh - 66px);
  overflow: hidden;
  padding: clamp(54px, 8vw, 100px) clamp(20px, 5vw, 76px);
  background:
    radial-gradient(60rem 38rem at 0 0, rgba(167, 224, 150, 0.28), transparent 62%),
    linear-gradient(135deg, #f8fbf7 0 54%, #edf7eb 100%);
}
.hero::after {
  content: "SpDL";
  position: absolute;
  z-index: 0;
  right: -0.06em;
  bottom: -0.29em;
  color: rgba(8, 127, 114, 0.04);
  font-size: clamp(160px, 26vw, 410px);
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 1;
}
.hero-copy, .hero-visual { position: relative; z-index: 1; }
.eyebrow, .section-kicker, .feature-label {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.16em;
}
.eyebrow span { display: inline-flex; margin-right: 8px; border-radius: 999px; padding: 4px 9px; background: var(--green); color: #fff; letter-spacing: 0.08em; }
.hero h1 {
  margin: 0;
  color: var(--ink-strong);
  font-size: clamp(58px, 7.4vw, 112px);
  font-weight: 900;
  letter-spacing: -0.075em;
  line-height: 0.96;
}
.hero h1 em { color: var(--green); font-style: normal; }
.hero-catch { margin: 26px 0 0; color: var(--ink-strong); font-size: clamp(20px, 2.3vw, 30px); font-weight: 800; }
.hero-lead { max-width: 680px; margin: 17px 0 0; color: var(--muted); font-size: clamp(16px, 1.55vw, 20px); }
.hero-principle {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  margin-top: 22px;
  border-left: 4px solid var(--green);
  padding: 4px 0 4px 13px;
  text-decoration: none;
}
.hero-principle span { color: var(--green); font-size: 9px; font-weight: 900; letter-spacing: 0.17em; }
.hero-principle strong { color: var(--ink-strong); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--green);
  border-radius: 8px;
  padding: 0 20px;
  color: var(--green-dark);
  font-weight: 800;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { background: var(--green); color: #fff; box-shadow: 0 10px 24px rgba(8, 127, 114, 0.22); }
.button.secondary { background: rgba(255, 255, 255, 0.62); }
.education-callout {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 7px 14px;
  margin-top: 30px;
  border-left: 4px solid var(--orange);
  padding: 9px 0 9px 14px;
}
.education-callout strong { color: var(--orange); font-size: 21px; }
.education-callout span { color: var(--muted); font-size: 14px; }

.hero-visual {
  overflow: hidden;
  border: 1px solid #b9c8bd;
  border-radius: 13px;
  background: #fff;
  box-shadow: var(--shadow);
}
.window-bar { display: flex; align-items: center; gap: 6px; height: 32px; padding: 0 11px; border-bottom: 1px solid #cad7cc; background: #e8f4e5; }
.window-bar span { width: 8px; height: 8px; border-radius: 50%; background: #90a39a; }
.window-bar small { margin-left: 5px; color: #597068; font-size: 10px; font-weight: 800; letter-spacing: 0.1em; }
.hero-visual img { display: block; width: 100%; height: auto; }
.visual-note { margin: 0; padding: 8px 12px; color: var(--muted); font-size: 11px; text-align: right; }

.promise { display: grid; grid-template-columns: repeat(3, 1fr); border-block: 1px solid var(--line); background: #fff; }
.promise p { margin: 0; padding: 20px clamp(16px, 3vw, 42px); color: var(--muted); font-size: 13px; text-align: center; }
.promise p + p { border-left: 1px solid var(--line); }
.promise span { display: block; color: var(--green); font-size: 10px; font-weight: 900; letter-spacing: 0.15em; }

.section-shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.context-principle {
  position: relative;
  overflow: hidden;
  padding-block: clamp(82px, 11vw, 142px);
  background:
    radial-gradient(50rem 34rem at 100% 0, rgba(38, 145, 127, 0.2), transparent 66%),
    var(--ink-strong);
  color: #fff;
}
.context-principle::after {
  content: "CONTEXT";
  position: absolute;
  right: -0.04em;
  bottom: -0.25em;
  color: rgba(255, 255, 255, 0.025);
  font-size: clamp(110px, 22vw, 320px);
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 1;
  pointer-events: none;
}
.context-principle .section-shell { position: relative; z-index: 1; }
.context-principle .section-kicker { color: #78d4c4; }
.principle-lead { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(46px, 7vw, 88px); align-items: end; }
.principle-index { margin: 0 0 17px; color: #78d4c4; font-size: 11px; font-weight: 900; letter-spacing: 0.15em; }
.principle-lead h2 { margin: 0; color: #fff; font-size: clamp(54px, 6vw, 84px); letter-spacing: -0.075em; line-height: 0.96; }
.principle-lead h2 em { color: #78d4c4; font-style: normal; }
.principle-copy p { margin: 0; color: #c5d5d0; font-size: clamp(16px, 1.8vw, 21px); }
.principle-copy strong { display: block; margin-top: 26px; border-left: 3px solid #78d4c4; padding-left: 18px; color: #fff; font-size: clamp(17px, 2vw, 23px); line-height: 1.6; }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: clamp(56px, 8vw, 96px); border: 1px solid rgba(255, 255, 255, 0.15); background: rgba(255, 255, 255, 0.15); }
.principle-grid article { min-height: 330px; padding: clamp(26px, 4vw, 42px); background: rgba(13, 39, 34, 0.95); }
.principle-grid span { color: #78d4c4; font-size: 10px; font-weight: 900; letter-spacing: 0.16em; }
.principle-grid h3 { margin: 36px 0 18px; color: #fff; font-size: clamp(25px, 3vw, 35px); letter-spacing: -0.04em; line-height: 1.3; }
.principle-grid p { margin: 0; color: #b9cac4; font-size: 14px; }
.direction-note { margin: 22px 0 0; border: 1px solid rgba(120, 212, 196, 0.28); padding: 16px 18px; color: #aebfba; font-size: 12px; }
.direction-note strong { color: #78d4c4; }

.intro { padding-block: clamp(74px, 10vw, 128px); text-align: center; }
.intro h2, .more-features h2, .video-roadmap h2, .pricing h2, .faq h2, .closing h2 {
  margin: 0;
  color: var(--ink-strong);
  font-size: clamp(34px, 5vw, 62px);
  letter-spacing: -0.05em;
  line-height: 1.2;
}
.section-lead { width: min(800px, 100%); margin: 22px auto 0; color: var(--muted); font-size: clamp(16px, 2vw, 20px); }

.feature-story { border-top: 1px solid var(--line); }
.feature-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 54px);
  align-items: center;
  width: min(1320px, calc(100% - 40px));
  padding-block: clamp(70px, 9vw, 116px);
}
.feature-row + .feature-row { border-top: 1px solid var(--line); }
.feature-copy { width: min(780px, 100%); }
.feature-row.reverse .feature-copy { margin-left: auto; }
.feature-number { display: block; margin-bottom: 20px; color: rgba(8, 127, 114, 0.18); font: 900 clamp(62px, 8vw, 112px)/0.75 Georgia, serif; }
.feature-copy h2 { margin: 0; color: var(--ink-strong); font-size: clamp(31px, 4.3vw, 56px); letter-spacing: -0.055em; line-height: 1.16; }
.feature-copy > p:not(.feature-label) { margin: 22px 0 0; color: var(--muted); }
.feature-copy ul { display: grid; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.feature-copy li { position: relative; padding-left: 22px; font-size: 14px; font-weight: 700; }
.feature-copy li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 10px; height: 2px; background: var(--green); }
.feature-shot { position: relative; margin: 0; }
.feature-shot img { display: block; width: 100%; height: auto; object-fit: contain; border: 1px solid #b9c9bd; border-radius: 10px; background: #fff; box-shadow: var(--shadow); }
.shot-number { position: absolute; z-index: 2; top: -16px; left: -16px; display: grid; width: 50px; height: 50px; place-items: center; border-radius: 50%; background: var(--green); color: #fff; font: 800 16px/1 Georgia, serif; box-shadow: 0 8px 20px rgba(8, 127, 114, 0.28); }
.feature-shot figcaption { margin-top: 12px; color: var(--muted); font-size: 12px; }

.more-features { padding-block: clamp(76px, 10vw, 126px); background: var(--ink-strong); color: #fff; }
.more-features h2 { color: #fff; }
.more-features .section-kicker { color: #78d4c4; }
.detail-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 42px; border: 1px solid rgba(255, 255, 255, 0.16); background: rgba(255, 255, 255, 0.16); }
.detail-grid article { min-height: 230px; padding: 28px; background: #132b26; }
.detail-grid span { color: #78d4c4; font-size: 10px; font-weight: 900; letter-spacing: 0.16em; }
.detail-grid h3 { margin: 18px 0 8px; font-size: 21px; }
.detail-grid p { margin: 0; color: #b9cac4; font-size: 14px; }

.video-roadmap { padding-block: clamp(82px, 11vw, 142px); background: #f3f7f2; }
.roadmap-heading { display: grid; grid-template-columns: 0.58fr 1.42fr; gap: clamp(40px, 8vw, 110px); align-items: start; }
.roadmap-badge { display: inline-flex; border-radius: 999px; padding: 7px 13px; background: var(--orange); color: #fff; font-size: 12px; font-weight: 900; letter-spacing: 0.08em; }
.roadmap-heading h2 { margin: 0; }
.roadmap-heading > div:last-child > p { max-width: 780px; margin: 24px 0 0; color: var(--muted); font-size: clamp(16px, 1.8vw, 20px); }
.generation-boundary { display: grid; grid-template-columns: 1fr minmax(180px, 0.52fr) 1.15fr; gap: 18px; align-items: stretch; margin-top: clamp(50px, 7vw, 82px); }
.source-vault, .model-card, .explicit-gate { border: 1px solid var(--line); border-radius: 10px; }
.source-vault { padding: clamp(28px, 4vw, 42px); background: var(--ink-strong); color: #fff; box-shadow: var(--shadow); }
.source-vault > span, .model-card > span, .explicit-gate > span { font-size: 9px; font-weight: 900; letter-spacing: 0.14em; }
.source-vault > span { color: #78d4c4; }
.source-vault h3 { margin: 22px 0; font-size: 27px; }
.source-vault ul { display: grid; gap: 9px; margin: 0; padding: 0; list-style: none; }
.source-vault li { position: relative; padding-left: 18px; color: #c2d1cc; font-size: 14px; }
.source-vault li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 8px; height: 2px; background: #78d4c4; }
.source-vault strong { display: block; margin-top: 30px; border-top: 1px solid rgba(255, 255, 255, 0.16); padding-top: 16px; color: #78d4c4; }
.explicit-gate { position: relative; display: flex; flex-direction: column; justify-content: center; padding: 24px; background: #fff; text-align: center; }
.explicit-gate::before, .explicit-gate::after { content: ""; position: absolute; top: 50%; width: 18px; height: 1px; background: var(--green); }
.explicit-gate::before { left: -19px; }
.explicit-gate::after { right: -19px; }
.explicit-gate > span { color: var(--green); }
.explicit-gate strong { margin-top: 16px; color: var(--ink-strong); font-size: 17px; }
.explicit-gate p { margin: 14px 0 0; color: var(--muted); font-size: 11px; }
.model-options { display: grid; gap: 12px; }
.model-card { padding: 26px 28px; background: #fff; }
.model-card > span { color: var(--green); }
.model-card h3 { margin: 12px 0 7px; color: var(--ink-strong); font-size: 21px; }
.model-card p { margin: 0; color: var(--muted); font-size: 13px; }
.local-model { border-left: 6px solid var(--green); }
.cloud-model { border-left: 6px solid #7c8f89; }
.cloud-model > span { color: #697c76; }
.roadmap-status { display: grid; grid-template-columns: minmax(150px, 0.25fr) 1fr; gap: 24px; margin-top: 18px; border: 1px solid #d2c3b8; border-radius: 9px; padding: 20px 24px; background: #fffaf6; }
.roadmap-status strong { color: #9c591f; }
.roadmap-status p { margin: 0; color: #78685c; font-size: 13px; }
.platform-roadmap { display: grid; grid-template-columns: 1.25fr repeat(3, 1fr); gap: 1px; margin-top: clamp(56px, 8vw, 90px); border: 1px solid var(--line); background: var(--line); }
.platform-intro, .platform-card { min-height: 230px; padding: clamp(25px, 3.2vw, 36px); background: #fff; }
.platform-intro { background: var(--ink-strong); }
.platform-intro .section-kicker { color: #78d4c4; }
.platform-intro h3 { margin: 22px 0 0; color: #fff; font-size: clamp(25px, 2.8vw, 34px); letter-spacing: -0.04em; line-height: 1.3; }
.platform-card { display: flex; flex-direction: column; }
.platform-card span { font-size: 9px; font-weight: 900; letter-spacing: 0.16em; }
.platform-card.current span { color: var(--green); }
.platform-card.planned span { color: var(--orange); }
.platform-card h4 { margin: auto 0 5px; color: var(--ink-strong); font-size: 27px; }
.platform-card p { margin: 0; color: var(--muted); font-size: 12px; }

.pricing { padding-block: clamp(76px, 10vw, 126px); background: linear-gradient(140deg, #edf8eb, #f8fbf7 58%); }
.pricing-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 42px; }
.price-card { position: relative; min-height: 390px; border: 1px solid var(--line); border-radius: 12px; padding: clamp(26px, 4vw, 42px); background: #fff; box-shadow: 0 16px 40px rgba(31, 65, 55, 0.08); }
.price-card.education { border-top: 7px solid var(--orange); }
.price-card.standard { border-top: 7px solid var(--green); }
.price-for { margin: 0; color: var(--muted); font-weight: 800; }
.price { display: flex; align-items: baseline; gap: 8px; margin: 18px 0 0; }
.price strong { color: var(--ink-strong); font-size: clamp(48px, 7vw, 78px); letter-spacing: -0.06em; line-height: 1; }
.price span { font-size: 20px; font-weight: 700; }
.tax { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
.price-summary { margin: 24px 0 0; font-weight: 700; }
.price-card ul { display: grid; gap: 9px; margin: 24px 0 0; padding: 0; list-style: none; }
.price-card li { position: relative; padding-left: 24px; color: var(--muted); }
.price-card li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 900; }
.education li::before { color: var(--orange); }
.ai-price-note { display: grid; grid-template-columns: minmax(180px, 0.28fr) 1fr; gap: 24px; align-items: center; margin-top: 18px; border: 1px solid #bed5c6; border-radius: 10px; padding: 22px 26px; background: rgba(255, 255, 255, 0.72); }
.ai-price-note strong { color: var(--green-dark); font-size: 20px; }
.ai-price-note p { margin: 0; color: var(--muted); }
.pricing-fineprint { margin: 16px 0 0; color: var(--muted); font-size: 12px; text-align: center; }
.center-action { display: flex; justify-content: center; margin-top: 28px; }

.faq { padding-block: clamp(76px, 10vw, 126px); }
.faq-list { margin-top: 38px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 0 4px; }
.faq summary { cursor: pointer; padding: 22px 34px 22px 0; color: var(--ink-strong); font-size: 17px; font-weight: 800; }
.faq details p { max-width: 840px; margin: -5px 0 24px; color: var(--muted); }

.closing { padding-block: clamp(76px, 10vw, 126px); background: linear-gradient(150deg, #dff3d5, #eef8ec 60%, #fff); text-align: center; }
.closing p:not(.section-kicker) { margin: 18px 0 0; color: var(--muted); font-size: 18px; }
.closing .hero-actions { justify-content: center; }

.site-footer { display: flex; justify-content: space-between; gap: 24px; padding: 28px clamp(20px, 5vw, 72px); border-top: 1px solid var(--line); background: #fff; color: var(--muted); font-size: 13px; }
.site-footer p { margin: 0; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
.site-footer a { text-decoration: none; }

@media (max-width: 1000px) {
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .hero-copy { max-width: 800px; }
  .principle-lead, .roadmap-heading { grid-template-columns: 1fr; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article { min-height: 0; }
  .generation-boundary { grid-template-columns: 1fr; }
  .explicit-gate::before, .explicit-gate::after { display: none; }
  .platform-roadmap { grid-template-columns: 1fr 1fr; }
  .detail-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 700px) {
  .site-header { align-items: flex-start; }
  .brand span:last-child { display: none; }
  .site-nav { justify-content: flex-end; gap: 10px 14px; }
  .site-nav a[href="#faq"], .site-nav a[href="#features"] { display: none; }
  .nav-cta { min-height: 34px; padding-inline: 10px; }
  .hero { padding-top: 48px; }
  .hero h1 { font-size: clamp(54px, 19vw, 84px); }
  .promise { grid-template-columns: 1fr; }
  .promise p + p { border-top: 1px solid var(--line); border-left: 0; }
  .feature-row { gap: 36px; }
  .shot-number { top: -12px; left: -8px; width: 44px; height: 44px; }
  .detail-grid, .pricing-grid { grid-template-columns: 1fr; }
  .detail-grid article { min-height: 0; }
  .platform-roadmap { grid-template-columns: 1fr; }
  .platform-intro, .platform-card { min-height: 0; }
  .platform-card h4 { margin-top: 30px; }
  .roadmap-status { grid-template-columns: 1fr; gap: 6px; }
  .ai-price-note { grid-template-columns: 1fr; gap: 6px; }
  .site-footer { flex-direction: column; }
}

@media (max-width: 430px) {
  .site-nav a[href="#principle"] { display: none; }
  .hero-principle strong { font-size: 16px; }
  .principle-grid article, .source-vault, .model-card { padding: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}