/* ============================================================
   Crateforge — Landing page
   ダーク基調 + teal アクセント。アプリ本体の styles.css と統一。
   依存ゼロ・サブパス配信前提（相対パス）。
   ============================================================ */

:root {
  --bg: #0e1113;
  --bg-side: #0a0d0f;
  --bg2: #161a1d;
  --bg3: #1e2429;
  --bd: #22272b;
  --bd-strong: #2c3338;
  --ac: #6ca1b5;
  --ac-hi: #8bbacb;
  --ac-d: #325967;
  --on-ac: #06191f;
  --tx: #e4e7ea;
  --tx-strong: #f2f4f5;
  --tx2: #9da2a8;
  --mut: #737a80;
  --warn: #e0a33c;

  --ac-09: rgba(108, 161, 181, 0.09);
  --ac-14: rgba(108, 161, 181, 0.14);
  --ac-glow: rgba(108, 161, 181, 0.22);

  --maxw: 1120px;
  --radius: 14px;
  --radius-sm: 9px;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    "Noto Sans TC", "Microsoft JhengHei", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--tx);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

h1,
h2,
h3 {
  color: var(--tx-strong);
  line-height: 1.2;
  margin: 0;
  letter-spacing: -0.01em;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===================== Buttons ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease,
    border-color 0.15s ease, box-shadow 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--ac);
  color: var(--on-ac);
  box-shadow: 0 6px 22px -10px var(--ac-glow);
}

.btn-primary:hover {
  background: var(--ac-hi);
  box-shadow: 0 10px 30px -10px var(--ac-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--tx);
  border-color: var(--bd-strong);
}

.btn-ghost:hover {
  border-color: var(--ac);
  color: var(--tx-strong);
}

.btn-lg {
  padding: 14px 26px;
  font-size: 15px;
}

/* ===================== Nav ===================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  transition: background 0.2s ease, border-color 0.2s ease;
  border-bottom: 1px solid transparent;
}

.nav.is-scrolled {
  background: rgba(10, 13, 15, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--bd);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--tx-strong);
}

.nav-logo {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links > a {
  font-size: 14px;
  color: var(--tx2);
  transition: color 0.15s ease;
}

.nav-links > a:hover {
  color: var(--tx-strong);
}

.nav-gh {
  display: inline-flex;
  align-items: center;
  color: var(--tx2);
  transition: color 0.15s ease;
}

.nav-gh:hover {
  color: var(--tx-strong);
}

.nav-dl {
  padding: 8px 16px;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--bd-strong);
  border-radius: 999px;
  overflow: hidden;
  background: var(--bg2);
}

.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--tx2);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 11px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s ease, color 0.15s ease;
}

.lang-switch button:hover {
  color: var(--tx-strong);
}

.lang-switch button.is-active {
  background: var(--ac);
  color: var(--on-ac);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 38px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--bd-strong);
  border-radius: 9px;
  cursor: pointer;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--tx);
  border-radius: 2px;
}

/* ===================== Hero ===================== */
.hero {
  position: relative;
  padding: 150px 0 90px;
  text-align: center;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -180px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 700px;
  background: radial-gradient(
    closest-side,
    var(--ac-glow),
    rgba(108, 161, 181, 0.05) 55%,
    transparent 72%
  );
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--bd) 1px, transparent 1px),
    linear-gradient(90deg, var(--bd) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(
    ellipse 70% 55% at 50% 28%,
    #000 0%,
    transparent 75%
  );
  mask-image: radial-gradient(
    ellipse 70% 55% at 50% 28%,
    #000 0%,
    transparent 75%
  );
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-logo {
  width: 96px;
  height: 96px;
  margin-bottom: 26px;
  border-radius: 22px;
  filter: drop-shadow(0 10px 40px var(--ac-glow));
}

.hero-badge {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ac-hi);
  background: var(--ac-09);
  border: 1px solid var(--ac-14);
  border-radius: 999px;
  padding: 6px 14px;
}

.hero-title {
  font-size: clamp(46px, 8vw, 84px);
  font-weight: 800;
  margin: 22px 0 0;
  background: linear-gradient(180deg, #fff 0%, #c4ccd1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--tx2);
  margin: 20px 0 0;
  max-width: 620px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 26px;
}

.tech-badge {
  font-size: 12px;
  font-weight: 600;
  color: var(--tx2);
  background: var(--bg2);
  border: 1px solid var(--bd);
  border-radius: 7px;
  padding: 5px 11px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 32px;
}

.hero-platforms {
  font-size: 13px;
  color: var(--mut);
  margin: 16px 0 0;
}

/* ===================== Screenshot frames ===================== */
.shot {
  position: relative;
  margin: 0;
  border-radius: var(--radius);
  border: 1px solid var(--bd);
  background: var(--bg2);
  overflow: hidden;
}

.shot img {
  width: 100%;
  height: auto;
  display: block;
}

.shot-hero {
  width: 100%;
  max-width: 940px;
  margin: 54px auto 0;
  aspect-ratio: 16 / 10;
  box-shadow: 0 40px 80px -40px rgba(0, 0, 0, 0.8), 0 0 0 1px var(--bd) inset;
}

.shot-hero img {
  height: 100%;
  object-fit: cover;
}

.shot-ph {
  display: none;
}

.shot-cap {
  padding: 11px 14px;
  font-size: 13px;
  color: var(--tx2);
  border-top: 1px solid var(--bd);
  background: var(--bg-side);
}

.shot.is-empty {
  aspect-ratio: 16 / 10;
  border-style: dashed;
  border-color: var(--bd-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  background: repeating-linear-gradient(
      135deg,
      transparent,
      transparent 12px,
      var(--ac-09) 12px,
      var(--ac-09) 13px
    ),
    var(--bg2);
}

.shot.is-empty img,
.shot.is-empty .shot-cap {
  display: none;
}

.shot.is-empty .shot-ph {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  height: 100%;
  font-size: 14px;
  font-weight: 600;
  color: var(--mut);
  border: 0;
  background: transparent;
  padding: 16px;
  text-align: center;
}

.shot.is-empty .shot-ph::before {
  content: "📷";
  font-size: 18px;
}

/* ===================== Sections ===================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-alt {
  background: var(--bg-side);
  border-top: 1px solid var(--bd);
  border-bottom: 1px solid var(--bd);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 52px;
}

.section-title {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
}

.section-sub {
  font-size: 16px;
  color: var(--tx2);
  margin: 14px 0 0;
}

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ac);
  margin-bottom: 14px;
}

/* ===================== Features ===================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.card {
  background: var(--bg2);
  border: 1px solid var(--bd);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.18s ease, border-color 0.18s ease,
    background 0.18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--ac-d);
  background: var(--bg3);
}

.card-icon {
  font-size: 26px;
  line-height: 1;
  margin-bottom: 14px;
}

.card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.card p {
  font-size: 13.5px;
  color: var(--tx2);
  margin: 0;
}

/* ===================== DJ analysis ===================== */
.analysis-layout,
.ai-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.analysis-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.analysis-list li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 18px;
  position: relative;
}

.analysis-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--ac);
  transform: rotate(45deg);
}

.analysis-list strong {
  color: var(--tx-strong);
  font-size: 15px;
}

.analysis-list span {
  color: var(--tx2);
  font-size: 14px;
}

/* ===================== Gallery ===================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

/* ===================== AI curation ===================== */
.code-block {
  background: #0b0e10;
  border: 1px solid var(--bd);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 30px 60px -40px rgba(0, 0, 0, 0.8);
}

.code-head {
  display: flex;
  gap: 7px;
  padding: 12px 16px;
  background: var(--bg2);
  border-bottom: 1px solid var(--bd);
}

.code-head .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bd-strong);
}

.code-head .dot:first-child {
  background: #e06c5b;
}

.code-head .dot:nth-child(2) {
  background: var(--warn);
}

.code-head .dot:nth-child(3) {
  background: #6cb58a;
}

.code-block pre {
  margin: 0;
  padding: 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
}

.code-block code {
  font-family: inherit;
  white-space: pre;
}

.c-step {
  display: block;
  color: var(--mut);
}

.c-cmd {
  display: block;
  color: var(--ac-hi);
  margin-bottom: 14px;
}

.c-cmd:last-child {
  margin-bottom: 0;
}

.ai-text .btn {
  margin-top: 24px;
}

/* ===================== Download ===================== */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 40px;
}

.platform-card {
  background: var(--bg2);
  border: 1px solid var(--bd);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.platform-card:hover {
  transform: translateY(-3px);
  border-color: var(--ac-d);
}

.platform-icon {
  font-size: 34px;
  margin-bottom: 12px;
}

.platform-card h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.platform-card p {
  font-size: 13px;
  color: var(--tx2);
  margin: 0;
  font-family: var(--mono);
}

.download-cta {
  text-align: center;
}

.download-note {
  font-size: 13px;
  color: var(--mut);
  margin: 16px 0 0;
}

/* ===================== Footer ===================== */
.footer {
  border-top: 1px solid var(--bd);
  background: var(--bg-side);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 13px;
}

.footer-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.footer-brand strong {
  display: block;
  color: var(--tx-strong);
  font-size: 16px;
}

.footer-tagline {
  display: block;
  font-size: 13px;
  color: var(--mut);
}

.footer-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  font-size: 13px;
  color: var(--tx2);
}

.footer-meta a:hover {
  color: var(--ac-hi);
}

.footer-license,
.footer-built {
  color: var(--mut);
}

/* ===================== Reveal ===================== */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ===================== Responsive ===================== */
@media (max-width: 940px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .analysis-layout,
  .ai-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    padding: 20px 24px 26px;
    background: rgba(10, 13, 15, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--bd);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .nav-links.is-open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }
  .lang-switch,
  .nav-dl {
    align-self: flex-start;
  }
  .hero {
    padding: 120px 0 70px;
  }
  .gallery-grid,
  .platform-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-meta {
    align-items: flex-start;
  }
}

@media (max-width: 460px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}