:root {
  --bg-a: #fff5eb;
  --bg-b: #eef7ff;
  --panel: rgba(255, 255, 255, 0.94);
  --line: rgba(28, 63, 92, 0.12);
  --text: #1a3550;
  --muted: #64788b;
  --accent: #ef8e3f;
  --accent-top: #ffbf7a;
  --accent-soft: #fff1df;
  --shadow: 0 20px 40px rgba(35, 73, 104, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  background:
    radial-gradient(circle at 14% 12%, rgba(255, 211, 145, 0.38), transparent 16%),
    radial-gradient(circle at 88% 14%, rgba(209, 237, 255, 0.5), transparent 16%),
    radial-gradient(circle at 14% 88%, rgba(255, 255, 255, 0.6), transparent 18%),
    linear-gradient(180deg, var(--bg-a), var(--bg-b));
}

body.theme-grade3 {
  --accent: #58a95b;
  --accent-top: #8ed18f;
  --accent-soft: #ebf8ea;
}

body.theme-pre2 {
  --accent: #4f8cff;
  --accent-top: #8ab5ff;
  --accent-soft: #eaf2ff;
}

body.theme-grade2 {
  --accent: #d96896;
  --accent-top: #f09cbb;
  --accent-soft: #ffeaf3;
}

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

.page {
  width: min(100vw, 1180px);
  min-height: 100dvh;
  margin: 0 auto;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right))
    max(20px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  display: grid;
  gap: 16px;
  align-content: start;
}

.top-nav {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
  box-shadow: 0 10px 20px rgba(35, 73, 104, 0.08);
  font-weight: 800;
}

.hero,
.panel-card,
.note-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.hero {
  padding: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.05;
}

.lede {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.grid.compact {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.panel-card {
  padding: 16px;
  display: grid;
  gap: 10px;
}

.panel-card.coming-soon {
  background: rgba(255, 255, 255, 0.8);
}

.thumb {
  width: 100%;
  height: 124px;
  border-radius: 20px;
  display: block;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(240, 247, 255, 0.95));
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 900;
}

.subtags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.subtags span {
  padding: 6px 9px;
  border-radius: 999px;
  background: rgba(26, 53, 80, 0.06);
  font-size: 0.73rem;
  font-weight: 800;
}

.panel-card h2 {
  margin-bottom: 0;
  font-size: 1.08rem;
  line-height: 1.2;
}

.panel-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.87rem;
}

.panel-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.panel-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 16px;
  background: linear-gradient(180deg, var(--accent-top), var(--accent));
  color: #fff;
  font-weight: 900;
  box-shadow: 0 12px 24px rgba(35, 73, 104, 0.14);
}

.panel-button.secondary {
  background: rgba(26, 53, 80, 0.06);
  color: var(--text);
  box-shadow: none;
}

.panel-button.disabled {
  background: rgba(26, 53, 80, 0.08);
  color: var(--muted);
  box-shadow: none;
  cursor: default;
}

.note-card {
  padding: 18px 20px;
}

.note-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
}

@media (max-width: 980px) {
  .grid,
  .grid.compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

  .top-nav {
    flex-wrap: wrap;
  }

  .hero {
    padding: 22px;
  }
}