/* ampless LP — signal/oscilloscope dark-tech. 外部依存ゼロ・相対パスのみ */

:root {
  --bg:     #06070d;
  --bg-2:   #0a0c16;
  --panel:  rgba(16, 20, 34, 0.55);
  --ink:    #e9edf8;
  --muted:  #8b94ad;
  --dim:    #565d75;
  --cyan:   #34f5ff;
  --magenta:#ff4fa3;
  --amber:  #ffc24d;
  --line:   rgba(120, 150, 220, 0.10);
  --line-2: rgba(120, 150, 220, 0.18);

  --font-display: ui-monospace, "Cascadia Code", "JetBrains Mono", "Fira Code", SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;

  --maxw: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---- 背景レイヤ ---- */
#waveCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  /* 上部（ヒーロー）で濃く、下へフェード */
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 42%, transparent 78%);
          mask-image: linear-gradient(180deg, #000 0%, #000 42%, transparent 78%);
}

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 100% 64px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 64px 100%,
    radial-gradient(120% 80% at 50% -10%, rgba(52,245,255,0.10), transparent 60%),
    radial-gradient(100% 70% at 100% 0%, rgba(255,79,163,0.08), transparent 55%);
  -webkit-mask-image: radial-gradient(130% 100% at 50% 0%, #000 55%, transparent 100%);
          mask-image: radial-gradient(130% 100% at 50% 0%, #000 55%, transparent 100%);
}

.scanlines {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(255,255,255,0.018) 0 1px, transparent 1px 3px);
  mix-blend-mode: overlay;
  opacity: 0.6;
}

/* ---- レイアウト土台 ---- */
.site-header, main, .site-footer { position: relative; z-index: 2; }

main > section,
.site-header,
.site-footer {
  width: min(100% - 2.5rem, var(--maxw));
  margin-inline: auto;
}

/* ---- ヘッダ ---- */
.site-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.1rem 0;
  position: sticky;
  top: 0;
  z-index: 20;
  width: 100%;
}
.site-header::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 50%;
  width: 100vw;
  transform: translateX(-50%);
  background: rgba(6,7,13,0.62);
  -webkit-backdrop-filter: blur(10px);
          backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  z-index: -1;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-right: auto;
}
.brand-mark { color: var(--cyan); display: inline-flex; filter: drop-shadow(0 0 8px rgba(52,245,255,0.6)); }
.brand-text { font-size: 1.15rem; }
.brand-text.small { font-size: 1rem; }
.amp { color: var(--cyan); text-shadow: 0 0 14px rgba(52,245,255,0.5); }

.nav-links { display: flex; gap: 1.5rem; }
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-family: var(--font-display);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--cyan); }

.caret { color: var(--cyan); animation: blink 1.1s step-end infinite; }

/* ---- ボタン ---- */
.btn {
  --b: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.7rem 1.15rem;
  border-radius: 9px;
  border: 1px solid color-mix(in srgb, var(--b) 55%, transparent);
  color: var(--b);
  background: color-mix(in srgb, var(--b) 8%, transparent);
  transition: transform 0.18s ease, box-shadow 0.25s, background 0.25s, border-color 0.25s;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); background: color-mix(in srgb, var(--b) 18%, transparent); box-shadow: 0 8px 30px color-mix(in srgb, var(--b) 30%, transparent); }
.btn-ghost { --b: var(--muted); color: var(--ink); }
.btn-ghost:hover { --b: var(--cyan); color: var(--cyan); }
.btn-primary {
  color: #04111a;
  background: linear-gradient(100deg, var(--cyan), var(--magenta));
  border: none;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.06) inset, 0 10px 34px rgba(52,245,255,0.25);
}
.btn-primary:hover { box-shadow: 0 0 0 1px rgba(255,255,255,0.12) inset, 0 14px 44px rgba(255,79,163,0.34); }
.btn-lg { font-size: 1.05rem; padding: 0.95rem 1.6rem; }
.nav-cta { padding: 0.5rem 0.85rem; font-size: 0.82rem; }

/* ---- ヒーロー ---- */
.hero { padding: clamp(3.5rem, 11vh, 8rem) 0 4rem; text-align: left; }
.eyebrow {
  font-family: var(--font-display);
  color: var(--cyan);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  margin: 0 0 1.4rem;
  opacity: 0.85;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 8.5vw, 6rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 0 0 1.6rem;
}
.hero-title .line { display: block; }
.grad {
  background: linear-gradient(92deg, var(--cyan), var(--magenta) 60%, var(--amber));
  background-size: 220% 100%;
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  animation: gradShift 7s linear infinite;
}
.hero-sub {
  max-width: 46ch;
  color: var(--muted);
  font-size: clamp(1rem, 2.3vw, 1.22rem);
  margin: 0 0 2.2rem;
}
.hero-sub code, .hero-sub :is(code) { color: var(--ink); }
code {
  font-family: var(--font-display);
  background: rgba(120,150,220,0.12);
  border: 1px solid var(--line);
  padding: 0.1em 0.4em;
  border-radius: 5px;
  font-size: 0.86em;
}
.hero-actions { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-bottom: 3rem; }

/* コードカード */
.hero-card, .showcase-code {
  border: 1px solid var(--line-2);
  border-radius: 13px;
  background: linear-gradient(180deg, rgba(16,20,34,0.85), rgba(8,10,18,0.85));
  box-shadow: 0 30px 80px rgba(0,0,0,0.5), 0 0 0 1px rgba(52,245,255,0.05);
  overflow: hidden;
  max-width: 640px;
}
.hero-card { animation: float 7s ease-in-out infinite; }
.card-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
}
.card-bar i { width: 11px; height: 11px; border-radius: 50%; background: var(--dim); }
.card-bar i:nth-child(1) { background: #ff5f57; }
.card-bar i:nth-child(2) { background: #febc2e; }
.card-bar i:nth-child(3) { background: #28c840; }
.card-bar span { margin-left: auto; font-family: var(--font-display); font-size: 0.78rem; color: var(--dim); }
.code {
  margin: 0;
  padding: 1.05rem 1.15rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--ink);
  overflow-x: auto;
  white-space: pre;
}
.c-prompt { color: var(--magenta); }
.c-cmd { color: var(--cyan); font-weight: 600; }
.c-str { color: var(--amber); }
.c-flag { color: var(--muted); }
.c-dim { color: var(--dim); }
.c-ok { color: #4be38b; }
.c-link { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }

/* ---- 指標 ---- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  margin-top: 1rem;
  margin-bottom: clamp(4rem, 10vh, 7rem);
}
.stat { background: var(--bg-2); padding: 1.7rem 1.4rem; }
.stat-num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  text-shadow: 0 0 22px rgba(52,245,255,0.28);
}
.stat-num .unit { font-size: 0.5em; color: var(--magenta); margin-left: 0.1em; }
.stat-num .inf { color: var(--magenta); text-shadow: 0 0 22px rgba(255,79,163,0.3); }
.stat-label { margin-top: 0.7rem; color: var(--muted); font-size: 0.82rem; line-height: 1.45; }

/* ---- セクション共通 ---- */
.section-head { margin-bottom: 2.6rem; }
.kicker {
  font-family: var(--font-display);
  color: var(--magenta);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  margin: 0 0 0.7rem;
}
h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4.5vw, 2.9rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 0;
}

/* ---- 特徴 ---- */
.features { padding-bottom: clamp(4rem, 10vh, 7rem); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1rem;
}
.feature {
  position: relative;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--panel);
  transition: transform 0.25s ease, border-color 0.25s, box-shadow 0.3s;
  overflow: hidden;
}
.feature::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(80% 60% at 0% 0%, rgba(52,245,255,0.10), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.feature:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--cyan) 45%, transparent); box-shadow: 0 18px 50px rgba(0,0,0,0.45); }
.feature:hover::after { opacity: 1; }
.f-icon {
  display: inline-flex;
  padding: 0.55rem;
  border-radius: 10px;
  border: 1px solid var(--line-2);
  background: rgba(52,245,255,0.06);
  margin-bottom: 1rem;
}
.f-icon svg { width: 22px; height: 22px; fill: none; stroke: var(--cyan); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.feature h3 { font-family: var(--font-display); font-size: 1.08rem; margin: 0 0 0.5rem; letter-spacing: -0.01em; }
.feature p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* ---- 仕組み ---- */
.showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  padding-bottom: clamp(4rem, 10vh, 7rem);
}
.steps { list-style: none; padding: 0; margin: 1.8rem 0 0; }
.steps li {
  display: flex;
  gap: 0.9rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}
.step-n { font-family: var(--font-display); color: var(--cyan); font-weight: 700; font-size: 0.9rem; }
.showcase-code { max-width: none; }
.code.tree { font-size: 0.82rem; }

/* ---- CTA ---- */
.cta { text-align: center; padding: clamp(4rem, 12vh, 8rem) 0; }
.cta-inner {
  border: 1px solid var(--line-2);
  border-radius: 22px;
  padding: clamp(2.5rem, 7vw, 4.5rem) 1.5rem;
  background:
    radial-gradient(90% 130% at 50% 0%, rgba(52,245,255,0.10), transparent 55%),
    radial-gradient(90% 130% at 50% 100%, rgba(255,79,163,0.10), transparent 55%),
    var(--bg-2);
  position: relative;
  overflow: hidden;
}
.cta-title { font-family: var(--font-display); font-size: clamp(2rem, 6vw, 3.6rem); line-height: 1.04; letter-spacing: -0.03em; margin: 0 0 1rem; }
.cta-sub { color: var(--muted); margin: 0 0 2rem; font-size: 1.05rem; }
.cta-cmd { margin: 1.6rem 0 0; }
.cta-cmd code { font-size: 0.95rem; padding: 0.45em 0.85em; }

/* ---- フッター ---- */
.site-footer {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  margin-top: 2rem;
}
.foot-links { display: flex; gap: 1.3rem; margin-right: auto; }
.foot-links a { color: var(--muted); text-decoration: none; font-family: var(--font-display); font-size: 0.85rem; }
.foot-links a:hover { color: var(--cyan); }
.foot-meta { color: var(--dim); font-family: var(--font-display); font-size: 0.78rem; }

/* ---- reveal ---- */
[data-animate] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.75s cubic-bezier(.2,.7,.2,1), transform 0.75s cubic-bezier(.2,.7,.2,1);
  will-change: opacity, transform;
}
[data-animate].in-view { opacity: 1; transform: none; }
[data-animate][data-delay="1"] { transition-delay: 0.08s; }
[data-animate][data-delay="2"] { transition-delay: 0.16s; }
[data-animate][data-delay="3"] { transition-delay: 0.24s; }
[data-animate][data-delay="4"] { transition-delay: 0.32s; }
[data-animate][data-delay="5"] { transition-delay: 0.40s; }

/* ---- keyframes ---- */
@keyframes gradShift { to { background-position: 220% 0; } }
@keyframes blink { 50% { opacity: 0; } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* ---- レスポンシブ ---- */
@media (max-width: 820px) {
  .showcase { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .nav-links { display: none; }
  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  [data-animate] { opacity: 1; transform: none; }
}