/* -- RESET & BASE -- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --p50:  #EEEDFE;
  --p100: #CECBF6;
  --p200: #AFA9EC;
  --p400: #7F77DD;
  --p600: #534AB7;
  --p800: #3C3489;
  --p900: #26215C;
  --g50:  #F6F5F3;
  --g100: #EBEBEB;
  --g200: #D4D4D4;
  --g400: #9E9E9E;
  --g600: #666666;
  --g800: #333333;
  --teal: #1D9E75;
  --teal-bg: #E1F5EE;
  --bg:   #ffffff;
  --bg2:  #F8F7FD;
  --bg3:  #F0EEF9;
  --txt:  #1a1830;
  --txt2: #5a5880;
  --txt3: #9896b8;
  --bdr:  rgba(100, 90, 180, 0.14);
  --bdr2: rgba(100, 90, 180, 0.28);
  --r:    8px;
  --r-lg: 12px;
  --mono: 'JetBrains Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', 'Hiragino Sans', 'Meiryo', sans-serif;
  background: var(--bg);
  color: var(--txt);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* -- UTILITIES -- */
.inner { max-width: 980px; margin: 0 auto; padding: 0 28px; }
code {
  font-family: var(--mono);
  font-size: 0.82em;
  background: var(--p50);
  color: var(--p800);
  border: 1px solid var(--p100);
  border-radius: 4px;
  padding: 1px 6px;
}
a { color: var(--p600); text-decoration: none; }
a:hover { text-decoration: underline; }

/* -- HEADER / NAV -- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--bdr);
  padding: 0;
}
.header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 28px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-logo {
  font-size: 14px;
  font-weight: 700;
  color: var(--p800);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--p400);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}
.nav-links a {
  font-size: 13px;
  color: var(--txt2);
  font-weight: 500;
}
.nav-links a:hover { color: var(--p600); text-decoration: none; }
.nav-gh-btn {
  background: var(--p600);
  color: #fff !important;
  border-radius: var(--r);
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 700;
}
.nav-gh-btn:hover { background: var(--p800); }
.nav-lang-btn {
  border: 1px solid var(--bdr2);
  border-radius: var(--r);
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--p600) !important;
}
.nav-lang-btn:hover { background: var(--p50); text-decoration: none; }

/* -- HERO -- */
.hero {
  padding: 56px 0 0;
  border-bottom: 1px solid var(--bdr);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--p50);
  border: 1px solid var(--p100);
  color: var(--p800);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 18px;
}
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--p400); }
.hero-title {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--txt);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.hero-title em { font-style: normal; color: var(--p600); display: block; }
.hero-sub {
  font-size: 15px;
  color: var(--txt2);
  line-height: 1.85;
  margin-bottom: 24px;
}
.flow-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.flow-chip {
  background: var(--bg3);
  border: 1px solid var(--p100);
  border-radius: var(--r);
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--p800);
}
.flow-arr { color: var(--p300); font-size: 16px; color: var(--p400); }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.btn-primary {
  background: var(--p600);
  color: #fff;
  border: none;
  border-radius: var(--r);
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--p800); text-decoration: none; color: #fff; }
.btn-secondary {
  background: #fff;
  color: var(--p800);
  border: 1.5px solid var(--p400);
  border-radius: var(--r);
  padding: 11px 22px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: background 0.15s, border-color 0.15s;
}
.btn-secondary:hover { background: var(--p50); text-decoration: none; color: var(--p800); }
.hero-img-wrap {
  border-top: 1px solid var(--bdr);
  margin-top: 4px;
}
.hero-img-wrap img {
  width: 100%;
  display: block;
}
.hero-caption {
  font-size: 12px;
  color: var(--txt3);
  text-align: center;
  padding: 10px 0 12px;
  border-top: 1px solid var(--bdr);
}

/* -- SECTION SHARED -- */
.sec { padding: 64px 0; border-bottom: 1px solid var(--bdr); }
.sec-bg2 { background: var(--bg2); }
.sec-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--p400);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.sec-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--txt);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.sec-sub {
  font-size: 14px;
  color: var(--txt2);
  margin-bottom: 36px;
  line-height: 1.8;
}

/* -- HOW IT WORKS (flow steps) -- */
.flow-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--bdr);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.flow-card {
  padding: 24px 20px;
  border-right: 1px solid var(--bdr);
  position: relative;
  background: var(--bg);
}
.flow-card:last-child { border-right: none; }
.fc-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--p600);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 12px;
}
.fc-title { font-size: 13px; font-weight: 700; color: var(--txt); margin-bottom: 6px; }
.fc-desc { font-size: 12px; color: var(--txt2); line-height: 1.65; }
.fc-tag {
  display: inline-block;
  margin-top: 8px;
  background: var(--p50);
  color: var(--p800);
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
}
.fc-tag-opt { background: var(--g50); color: var(--g600); }

/* -- FEATURES -- */
.feat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.feat-card {
  border: 1px solid var(--bdr);
  border-radius: var(--r-lg);
  padding: 20px 18px;
  background: var(--bg);
  transition: border-color 0.15s;
}
.feat-card:hover { border-color: var(--bdr2); }
.feat-icon {
  width: 36px; height: 36px;
  border-radius: 9px;
  background: var(--p50);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  margin-bottom: 12px;
}
.feat-title { font-size: 13px; font-weight: 700; color: var(--txt); margin-bottom: 6px; }
.feat-body { font-size: 12px; color: var(--txt2); line-height: 1.7; }
.tag-new {
  display: inline-block;
  background: var(--teal-bg);
  color: var(--teal);
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 700;
  margin-left: 4px;
  vertical-align: middle;
}

/* -- SETUP -- */
.setup-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.steps { display: flex; flex-direction: column; gap: 20px; }
.step-row { display: flex; gap: 16px; }
.step-num {
  width: 30px; height: 30px;
  border-radius: 50%;
  border: 2px solid var(--p400);
  color: var(--p600);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.step-head { font-size: 14px; font-weight: 700; color: var(--txt); margin-bottom: 4px; }
.step-body { font-size: 13px; color: var(--txt2); line-height: 1.7; }

/* -- Windows-style browser mockup -- */
.mock-win {
  border: 1px solid var(--g200);
  border-radius: 6px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.mock-titlebar {
  background: #f3f3f3;
  border-bottom: 1px solid #ddd;
  height: 32px;
  display: flex;
  align-items: stretch;
}
.mock-tb-left {
  display: flex;
  align-items: center;
  padding: 0 10px;
  gap: 8px;
  flex: 1;
}
.mock-favicon {
  width: 14px; height: 14px;
  background: var(--p100);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mock-favicon-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--p400); }
.mock-urlbar {
  background: #fff;
  border: 1px solid #c8c8c8;
  border-radius: 2px;
  padding: 2px 10px;
  font-family: var(--mono);
  font-size: 11px;
  color: #444;
  flex: 1;
  max-width: 240px;
}
.mock-winbtns {
  display: flex;
  align-items: stretch;
}
.mock-winbtn {
  width: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mock-winbtn svg { width: 10px; height: 10px; }
.mock-winbtn:last-child:hover { background: #e81123; }
.mock-winbtn:last-child:hover svg line { stroke: #fff; }
.mock-body {
  padding: 14px 16px;
  background: #faf9ff;
}
.mock-lbl { font-size: 10px; color: var(--txt3); margin-bottom: 4px; }
.mock-field {
  background: #fff;
  border: 1px solid var(--p100);
  border-radius: 5px;
  padding: 7px 11px;
  font-size: 12px;
  color: var(--txt);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.mock-field-blue { border-color: #378ADD; background: #f0f7ff; }
.mock-field-green {
  border-color: #639922;
  background: #f5faea;
  flex-direction: column;
  align-items: flex-start;
  gap: 5px;
}
.llm-badge {
  background: var(--p50);
  color: var(--p800);
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 700;
}
.mock-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.mock-tag {
  background: #e8f4ff;
  border: 1px solid #b8d8f4;
  border-radius: 3px;
  padding: 2px 7px;
  font-size: 11px;
  color: #1a5f9e;
  font-family: var(--mono);
}
.mock-gen-btn {
  background: var(--p600);
  color: #fff;
  width: 100%;
  text-align: center;
  padding: 9px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 700;
  margin-top: 2px;
}
.mock-prog-wrap {
  background: var(--p50);
  border-radius: 3px;
  height: 5px;
  margin-top: 8px;
}
.mock-prog {
  background: var(--p400);
  border-radius: 3px;
  height: 5px;
  width: 62%;
}
.mock-hint { font-size: 10px; color: var(--txt3); margin-top: 4px; }
.color-note {
  display: flex;
  gap: 14px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.cn-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--txt2);
}
.cn-dot-blue {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #b8d8f4;
  border: 1.5px solid #378ADD;
}
.cn-dot-green {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #c0dd97;
  border: 1.5px solid #639922;
}

/* -- GALLERY -- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gal-card {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--bdr);
  background: var(--bg);
  transition: border-color 0.15s;
}
.gal-card:hover { border-color: var(--bdr2); }
.gal-card img {
  width: 100%;
  display: block;
  aspect-ratio: 3/4;
  object-fit: cover;
}
.gal-meta { padding: 10px 12px; }
.gal-name { font-size: 13px; font-weight: 700; color: var(--txt); }
.gal-scene { font-size: 12px; color: var(--txt3); }
.gal-placeholder {
  aspect-ratio: 3/4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg2);
  gap: 8px;
}
.gal-plus { font-size: 28px; color: var(--p200); }
.gal-placeholder-text { font-size: 12px; color: var(--txt3); text-align: center; line-height: 1.6; }

/* -- REQUIREMENTS -- */
.req-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.req-card {
  border: 1px solid var(--bdr);
  border-radius: var(--r-lg);
  padding: 20px 18px;
  background: var(--bg);
}
.req-name { font-size: 14px; font-weight: 700; color: var(--txt); margin-bottom: 6px; }
.req-ver {
  display: inline-block;
  background: var(--p50);
  color: var(--p800);
  font-size: 11px;
  padding: 2px 9px;
  border-radius: 4px;
  font-weight: 700;
  margin-bottom: 8px;
}
.req-ver-opt { background: var(--g50); color: var(--g600); }
.req-desc { font-size: 13px; color: var(--txt2); line-height: 1.7; }
.req-opt { font-size: 11px; color: var(--txt3); margin-top: 6px; }

/* -- CTA -- */
.cta-sec {
  padding: 72px 0 80px;
  background: var(--bg3);
  border-bottom: none;
  text-align: center;
}
.cta-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--txt);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.cta-sub {
  font-size: 15px;
  color: var(--txt2);
  line-height: 1.85;
  margin-bottom: 32px;
}
.cta-btns {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}
.cta-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.cta-link {
  font-size: 13px;
  color: var(--p600);
  font-weight: 600;
  border-bottom: 1px solid var(--p400);
  padding-bottom: 1px;
}
.cta-link:hover { color: var(--p800); text-decoration: none; }

/* -- FOOTER -- */
.site-footer {
  background: var(--g800);
  color: #aaa;
  padding: 24px 28px;
  font-size: 12px;
  text-align: center;
}
.site-footer a { color: #bbb; }

/* -- RESPONSIVE -- */
@media (max-width: 720px) {
  .flow-cards { grid-template-columns: 1fr 1fr; }
  .flow-card { border-right: none; border-bottom: 1px solid var(--bdr); }
  .flow-card:nth-child(odd) { border-right: 1px solid var(--bdr); }
  .flow-card:last-child { border-bottom: none; }
  .feat-grid { grid-template-columns: 1fr 1fr; }
  .setup-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .req-grid { grid-template-columns: 1fr; }
  .nav-links li:not(:nth-last-child(-n+2)) { display: none; }
  .cta-btns { width: 100%; }
  .btn-primary, .btn-secondary { width: 100%; text-align: center; }
}
@media (max-width: 480px) {
  .feat-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 24px; }
}