:root {
  color-scheme: dark;
  --bg: #101214;
  --surface: #171a1e;
  --surface-2: #202429;
  --border: #2e343b;
  --text: #f2f4f7;
  --muted: #a3adb8;
  --accent: #b6ef64;
  --accent-hover: #c5f47e;
  --ink: #14210a;
  --danger: #ff8fa1;
  --danger-bg: rgba(255, 99, 120, 0.08);
  --danger-border: rgba(255, 99, 120, 0.38);
  --jp: "Noto Sans JP", "Hiragino Sans", system-ui, sans-serif;
  --en: "Outfit", var(--jp);
  --mono: "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(circle at 12% 0%, rgba(182, 239, 100, 0.08), transparent 36%),
    radial-gradient(circle at 88% 12%, rgba(182, 239, 100, 0.05), transparent 34%);
  color: var(--text);
  font: 16px/1.75 var(--jp);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; }
.muted { color: var(--muted); }
.grad { color: var(--accent); }

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(14px);
  background: rgba(16, 18, 20, 0.85);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px clamp(16px, 4vw, 48px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}
.logo img {
  border-radius: 8px;
  border: 1px solid var(--border);
  flex: none;
}
.logo span {
  display: block;
  font: 700 16px/1.2 var(--en);
}
.logo b {
  font-family: var(--jp);
  font-weight: 800;
}
.logo small {
  display: block;
  margin-top: 2px;
  font: 500 10px/1.2 var(--mono);
  letter-spacing: 0.08em;
  color: var(--muted);
}
.nav nav {
  display: flex;
  gap: 20px;
  align-items: center;
  font-size: 14px;
}
.nav nav a {
  text-decoration: none;
  color: var(--muted);
  transition: color 0.15s;
  white-space: nowrap;
}
.nav nav a:hover { color: var(--text); }
.nav .pill {
  color: var(--ink) !important;
  background: var(--accent);
  font-weight: 700;
  padding: 7px 16px;
  border-radius: 10px;
  transition: background 0.15s, transform 0.15s;
}
.nav .pill:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition: transform 0.15s, background 0.15s, border-color 0.15s;
}
.btn.primary {
  background: var(--accent);
  color: var(--ink);
  border: 1px solid transparent;
}
.btn.primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}
.btn.ghost {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}
.btn.ghost:hover {
  background: var(--surface-2);
  border-color: var(--muted);
  transform: translateY(-2px);
}

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: clamp(32px, 4vw, 56px);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 84px) clamp(16px, 4vw, 48px);
}
.hero-copy { min-width: 0; }
.eyebrow-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(182, 239, 100, 0.35);
  background: rgba(182, 239, 100, 0.1);
  font: 600 12px/1.4 var(--mono);
  color: var(--accent);
}
.eyebrow.subtle {
  border-color: var(--border);
  background: var(--surface);
  color: var(--muted);
}
.hero h1 {
  margin: 0;
  font-size: clamp(30px, 3.8vw, 48px);
  line-height: 1.28;
  font-weight: 900;
  letter-spacing: -0.01em;
}
.lead {
  color: var(--muted);
  font-size: 16px;
  margin: 20px 0 28px;
}
.lead strong { color: var(--text); }
.cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-notices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 22px;
}
.info-note {
  margin: 0;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.6;
}
.info-note strong { color: var(--text); }
.cta-warn {
  margin: 0;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--danger-border);
  background: var(--danger-bg);
  color: #ffd0d7;
  font-size: 13.5px;
  line-height: 1.6;
}
.cta-warn strong { color: var(--danger); }

/* ---------- Mock Preview (Non-overlapping Split Layout) ---------- */
.mock { min-width: 0; }
.mock-browser {
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.75);
  overflow: hidden;
}
.mock-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: #131619;
  border-bottom: 1px solid var(--border);
  font: 11px var(--mono);
  color: var(--muted);
}
.mock-dots { display: flex; gap: 6px; }
.mock-dots i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #30353b;
}
.mock-url {
  flex: 1;
  min-width: 0;
  padding: 3px 10px;
  border-radius: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.mock-tag {
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(182, 239, 100, 0.12);
  color: var(--accent);
  font-size: 10px;
  font-weight: 600;
  white-space: nowrap;
}
.mock-workspace {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
}
.mock-page {
  padding: 16px;
  background: #131619;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
}
.mock-kicker {
  display: inline-block;
  font: 600 10px var(--mono);
  color: var(--muted);
  letter-spacing: 0.08em;
}
.mock-title {
  font-size: 13px;
  font-weight: 700;
  margin: 2px 0 10px;
  color: var(--text);
}
.line {
  height: 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.09);
  margin-bottom: 8px;
}
.w45 { width: 45%; }
.w60 { width: 60%; }
.w75 { width: 75%; }
.w80 { width: 80%; }
.w90 { width: 90%; }
.mock-io {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}
.mock-io > div {
  padding: 6px 8px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
}
.mock-io small {
  display: block;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 2px;
}
.mock-io code {
  display: block;
  padding: 0;
  background: none;
  color: var(--text);
  font: 10.5px/1.35 var(--mono);
  white-space: pre;
}
.code-lines {
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
}
.code-head {
  display: flex;
  justify-content: space-between;
  font: 10px var(--mono);
  color: var(--muted);
  margin-bottom: 8px;
}
.code-lines .line {
  background: rgba(182, 239, 100, 0.22);
  margin-bottom: 6px;
}
.code-lines .line:last-child { margin-bottom: 0; }
.mock-fab-row {
  display: flex;
  justify-content: flex-end;
  padding-top: 2px;
}
.mock-fab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--accent);
  background: var(--bg);
  color: var(--text);
  font: 700 12px var(--jp);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
}
.mock-fab-icon {
  font: 600 12px var(--mono);
  color: var(--accent);
}

.mock-panel {
  padding: 16px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}
.mock-panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.mock-panel-brand {
  font: 700 12px var(--jp);
  color: var(--text);
}
.mock-panel-badge {
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--muted);
  font-size: 10px;
}
.mock-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
}
.mock-steps span {
  text-align: center;
  padding: 5px 4px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
}
.mock-steps b {
  font-family: var(--mono);
  margin-right: 2px;
}
.mock-steps .on {
  color: var(--ink);
  border-color: var(--accent);
  background: var(--accent);
}
.mock-card {
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 12px;
  line-height: 1.6;
}
.mock-card-label {
  font: 600 10px var(--mono);
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.mock-card p {
  margin: 0;
  color: var(--muted);
}
.caret {
  display: inline-block;
  width: 5px;
  height: 1em;
  background: var(--accent);
  vertical-align: text-bottom;
  margin-left: 3px;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- Sections ---------- */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(48px, 6vw, 84px) clamp(16px, 4vw, 48px);
}
.section-head {
  text-align: center;
  margin-bottom: 36px;
}
.section-eyebrow {
  margin: 0 0 8px;
  font: 600 11px var(--mono);
  letter-spacing: 0.14em;
  color: var(--accent);
}
.section h2 {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 900;
}
.section h2 small {
  font: 600 16px var(--mono);
  color: var(--muted);
  margin-left: 6px;
}

/* ---------- 3-Step Cards (No overlapping watermarks) ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.card {
  padding: 24px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.2s, border-color 0.2s;
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(182, 239, 100, 0.5);
}
.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.step-pill {
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(182, 239, 100, 0.14);
  border: 1px solid rgba(182, 239, 100, 0.35);
  color: var(--accent);
  font: 700 11px var(--mono);
  letter-spacing: 0.06em;
}
.step-sub {
  font: 600 11px var(--mono);
  color: var(--muted);
  letter-spacing: 0.08em;
}
.card h3 {
  margin: 2px 0 0;
  font-size: 19px;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.7;
}

/* ---------- Features Grid ---------- */
.features {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.features li {
  padding: 20px 22px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.7;
}
.features b {
  display: block;
  color: var(--text);
  margin-bottom: 6px;
  font-size: 15.5px;
}
kbd {
  padding: 2px 7px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  font: 12px var(--mono);
  color: var(--text);
}

/* ---------- Warning Section ---------- */
.warn-section { padding-top: 8px; padding-bottom: 8px; }
.warn-box {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 28px 30px;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--danger-border);
  background: linear-gradient(135deg, rgba(255, 70, 100, 0.12), rgba(255, 140, 60, 0.05));
}
.warn-box::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: repeating-linear-gradient(-45deg, #ff5a76 0 12px, #2a0d18 12px 24px);
}
.warn-icon {
  flex: none;
  font-size: 36px;
  line-height: 1;
  margin-top: 4px;
}
.warn-content { min-width: 0; }
.warn-box h2 {
  text-align: left;
  margin: 0 0 8px;
  font-size: clamp(20px, 2.6vw, 26px);
  color: var(--danger);
}
.warn-lead {
  margin: 0 0 12px;
  font-size: 15.5px;
}
.warn-lead strong {
  color: #fff;
  background: linear-gradient(transparent 65%, rgba(255, 90, 118, 0.4) 65%);
}
.warn-box ul {
  margin: 0 0 12px;
  padding-left: 1.25em;
  color: #f3c9d0;
  font-size: 14.5px;
}
.warn-box li { margin: 4px 0; }
.warn-foot {
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
}

/* ---------- Installation Steps ---------- */
.install-lead {
  max-width: 760px;
  margin: 0 auto 24px;
  text-align: center;
  color: var(--muted);
  font-size: 15px;
}
.steps {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 780px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.steps li {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 20px 24px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
}
.step-num {
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--ink);
  font: 800 16px var(--mono);
}
.steps h3 {
  margin: 0 0 4px;
  font-size: 16.5px;
}
.steps p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}
.steps a {
  color: var(--accent);
  font-weight: 700;
}
code {
  font: 12.5px var(--mono);
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--accent);
}
.note {
  max-width: 780px;
  margin: 24px auto 0;
  padding: 14px 18px;
  border-radius: 12px;
  border: 1px solid var(--danger-border);
  background: var(--danger-bg);
  color: #ffc2cc;
  font-size: 14px;
}
.note strong { color: var(--danger); }

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 36px 16px 48px;
  border-top: 1px solid var(--border);
  font-size: 13px;
}
.footer p { margin: 4px 0; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav nav a:not(.pill) { display: none; }
  .mock-workspace { grid-template-columns: 1fr; }
  .mock-page { border-right: 0; border-bottom: 1px solid var(--border); }
  .warn-box { flex-direction: column; gap: 12px; padding: 22px 20px; }
  .steps li { padding: 18px; gap: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}