*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --bg2: #f8f9fa;
  --fg: #1a1a2e;
  --fg2: #6b7280;
  --fg3: #9ca3af;
  --accent: #3ea8ff;
  --accent-bg: #e8f4ff;
  --border: #e5e7eb;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --sans: 'Inter', 'Noto Sans JP', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.07), 0 1px 3px rgba(0,0,0,0.04);
  --shadow-hover: 0 8px 28px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171923;
    --bg2: #1e2130;
    --fg: #e8eaf0;
    --fg2: #9aa0b2;
    --fg3: #6b7280;
    --border: #2d3148;
    --accent-bg: #1a2a3a;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow: 0 4px 16px rgba(0,0,0,0.3);
    --shadow-hover: 0 8px 28px rgba(0,0,0,0.4);
  }
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  max-width: 770px;
  margin: auto;
}

/* ── MARQUEE ── */
.marquee-wrap {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  padding: 0.6rem 0;
  white-space: nowrap;
}
.marquee-inner {
  display: inline-block;
  animation: ticker 22s linear infinite;
}
.marquee-inner span {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg3);
  margin-right: 2.5rem;
}
.marquee-inner .sep { color: var(--accent); margin-right: 2.5rem; }
@keyframes ticker {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ── HERO ── */
.hero {
  padding: 5rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.hero-title .dot { color: var(--accent); }
.hero-body {
  font-size: 0.95rem;
  color: var(--fg2);
  line-height: 1.75;
  max-width: 44ch;
  margin-bottom: 2rem;
}
.hero-body-title {
  font-weight: bold;
  font-size: 20px;
  img{
    margin: 0 0 -3px 3px;
  }
}
.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 20px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--fg2);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.2rem;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.btn:hover { background: var(--bg2); color: var(--fg); }

/* ── SECTION ── */
section {
  padding: 2.5rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.sec-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}
.sec-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.sec-more {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
}
.sec-more:hover { text-decoration: underline; }

/* ── PROJECT CARDS ── */
.carousel {
  display: flex;
  gap: 0.875rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 0.5rem;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}
.carousel::-webkit-scrollbar { display: none; }

.p-card {
  flex: 0 0 min(75vw, 280px);
  scroll-snap-align: start;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--fg);
  display: block;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s;
}
.p-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}
.p-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg2);
}
.p-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s;
}
.p-card:hover .p-img img { transform: scale(1.04); }
.p-body { padding: 0.875rem 1rem 1rem; }
.p-meta {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}
.p-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
}
.p-desc { font-size: 0.8rem; color: var(--fg2); line-height: 1.55; }

.carousel-dots {
  display: flex;
  gap: 5px;
  justify-content: center;
  margin-top: 1rem;
}
.cdot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, width 0.2s;
}
.cdot.active {
  background: var(--accent);
  width: 14px;
  border-radius: 99px;
}

/* ── YOUTUBE ── */
.yt-tabs {
  display: flex;
  gap: 0.375rem;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
}
.yt-tab {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg2);
  cursor: pointer;
  font-family: var(--sans);
  transition: all 0.15s;
}
.yt-tab.active {
  background: var(--accent-bg);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}
.yt-tab:hover:not(.active) { background: var(--bg2); color: var(--fg); }

.yt-player {
  aspect-ratio: 16/9;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin-bottom: 0.875rem;
  background: #000;
}
.yt-player iframe { width: 100%; height: 100%; border: none; display: block; }

.yt-thumbs {
  display: flex;
  gap: 0.625rem;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 0.25rem;
}
.yt-thumbs::-webkit-scrollbar { display: none; }
.yt-thumb {
  flex: 0 0 min(36vw, 140px);
  cursor: pointer;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1.5px solid transparent;
  transition: border-color 0.15s, transform 0.15s;
  box-shadow: var(--shadow-sm);
}
.yt-thumb.active { border-color: var(--accent); }
.yt-thumb:hover { transform: scale(1.03); }
.yt-thumb img { width: 100%; display: block; aspect-ratio: 16/9; object-fit: cover; }

.yt-pls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.25rem;
}
.yt-pl {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.32rem 0.8rem;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--bg2);
  color: var(--fg2);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: all 0.15s;
}
.yt-pl:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-bg); }