:root {
  --bg: #0f1115;
  --panel: #171a21;
  --text: #eceef2;
  --muted: #9aa1ad;
  --accent: #ffb020;
  --border: #2a2e38;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Helvetica Neue", Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.7;
}

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 15px;
}

.nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
  letter-spacing: 0.05em;
}

.nav a {
  color: var(--muted);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.nav a:hover,
.nav a.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.hero {
  max-width: 960px;
  margin: 0 auto;
  padding: 96px 32px 64px;
  text-align: center;
}

.hero h1 {
  font-size: 42px;
  letter-spacing: 0.04em;
  margin: 0 0 12px;
}

.tagline {
  color: var(--muted);
  font-size: 16px;
  margin: 0 0 56px;
}

.hero-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 640px) {
  .hero-links { grid-template-columns: 1fr; }
}

.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 24px;
  text-align: left;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card h2 {
  margin: 0 0 8px;
  font-size: 20px;
  letter-spacing: 0.05em;
}

.card-logo {
  display: block;
  width: 160px;
  height: auto;
  margin: 0 0 16px;
}

.page-logo {
  display: block;
  width: 260px;
  height: auto;
  margin: 0 0 20px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 32px 96px;
}

.page h1 {
  font-size: 32px;
  letter-spacing: 0.04em;
  margin: 0 0 12px;
}

.breadcrumb {
  margin: 0 0 24px;
}

.breadcrumb a {
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb a:hover {
  color: var(--text);
}

.app-cta {
  margin: 24px 0 8px;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: #14151a;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 12px 24px;
  border-radius: 8px;
}

.button:hover {
  opacity: 0.9;
}

.button.disabled {
  background: var(--panel);
  color: var(--muted);
  border: 1px solid var(--border);
  cursor: default;
  pointer-events: none;
}

.feature-list {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.feature-list li {
  margin: 6px 0;
}

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.link-list li {
  margin: 10px 0;
}

.link-list a {
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
}

.link-list a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.sns-links {
  display: flex;
  gap: 16px;
}

.sns-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.sns-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.sns-links svg {
  width: 22px;
  height: 22px;
}

.about-photo {
  display: block;
  width: 220px;
  height: 220px;
  object-fit: cover;
  border-radius: 12px;
  margin: 0 0 20px;
}

.screenshot {
  display: block;
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.screenshot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 640px) {
  .screenshot-grid { grid-template-columns: 1fr; }
}

.screenshot-grid figure {
  margin: 0;
}

.screenshot-grid figcaption {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-align: center;
}

.video-wrap {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.video-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.block {
  padding: 28px 0;
  border-top: 1px solid var(--border);
}

.block h2 {
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0 0 12px;
}

.placeholder {
  color: var(--muted);
  font-style: italic;
}

.app-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 640px) {
  .app-grid { grid-template-columns: 1fr; }
}

.app-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.app-card:hover {
  border-color: var(--accent);
}

.app-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.app-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.placeholder-card {
  opacity: 0.5;
}

.footer {
  text-align: center;
  padding: 32px;
  color: var(--muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
}