:root {
  --ink: #1e293b;
  --gray: #64748b;
  --line: #dbeafe;
  --line-strong: #93c5fd;
  --bg: #f8fafc;
  --card: #ffffff;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --maxw: 920px;
}

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

body {
  font-family: "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.85;
  font-size: 15px;
}

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

.demo-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 14px 20px;
  position: sticky;
  top: 0;
  z-index: 10;
}

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

.demo-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--accent);
}

.demo-header h1 {
  font-size: 18px;
  font-weight: 800;
}

.demo-header a {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.demo-main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 20px 72px;
}

.demo-intro {
  margin-bottom: 36px;
}

.demo-intro h2 {
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 800;
  margin-bottom: 10px;
}

.demo-intro p {
  color: var(--gray);
  font-size: 14px;
}

/* ===== Day timeline ===== */
.day-timeline {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 32px 16px 12px;
  box-shadow: 0 12px 40px rgba(15, 23, 42, .06);
}

.day-timeline-list {
  list-style: none;
  position: relative;
}

.day-timeline-list::before {
  content: "";
  position: absolute;
  left: 43px;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--line-strong), var(--line));
}

.day-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 14px;
  align-items: start;
  padding-bottom: 28px;
}

.day-timeline-item:last-child {
  padding-bottom: 8px;
}

.day-timeline-axis {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 2px;
}

.day-timeline-dot {
  position: relative;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid #fff;
  background: var(--accent-soft);
  box-shadow:
    0 0 0 2px var(--accent),
    0 0 0 6px rgba(37, 99, 235, .12),
    0 4px 12px rgba(37, 99, 235, .18);
}

.day-timeline-dot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.day-timeline-time {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--accent);
  line-height: 1;
  white-space: nowrap;
}

.day-timeline-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
  box-shadow: 0 4px 16px rgba(15, 23, 42, .05);
}

.day-timeline-title {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 6px;
}

.day-timeline-text {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.8;
}

.demo-note {
  margin-top: 28px;
  text-align: center;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
}

@media (min-width: 768px) {
  .day-timeline {
    padding: 48px 24px 28px;
  }

  .day-timeline-list::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .day-timeline-item {
    grid-template-columns: 1fr;
    min-height: 108px;
    padding-bottom: 40px;
    align-items: center;
  }

  .day-timeline-axis {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    display: grid;
    grid-template-columns: 72px 52px 72px;
    align-items: center;
    gap: 0;
    padding-top: 0;
  }

  .day-timeline-dot {
    grid-column: 2;
    grid-row: 1;
  }

  .day-timeline-item:nth-child(odd) .day-timeline-time {
    grid-column: 3;
    grid-row: 1;
    text-align: left;
    padding-left: 4px;
  }

  .day-timeline-item:nth-child(even) .day-timeline-time {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    padding-right: 4px;
  }

  .day-timeline-card {
    width: calc(50% - 56px);
    max-width: 320px;
  }

  .day-timeline-item:nth-child(odd) .day-timeline-card {
    margin-right: auto;
  }

  .day-timeline-item:nth-child(even) .day-timeline-card {
    margin-left: auto;
  }
}

@media (max-width: 767px) {
  .day-timeline-item:nth-child(even) {
    background: transparent;
  }
}