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

:root {
  --bg1: #07111d;
  --bg2: #0b1d33;
  --bg3: #102846;
  --panel: rgba(9, 20, 36, 0.78);
  --panel-border: rgba(116, 208, 255, 0.25);
  --text: rgba(255, 255, 255, 0.93);
  --muted: rgba(255, 255, 255, 0.65);
  --accent: #79e0ff;
  --accent-strong: #43cfff;
  --btn1: #1d6fff;
  --btn2: #00c6ff;
  --shadow: 0 0 30px rgba(0, 180, 255, 0.12);
}

body {
  min-height: 100vh;
  font-family: "Yu Gothic", "Hiragino Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(60, 140, 255, 0.16), transparent 30%),
    radial-gradient(circle at top right, rgba(0, 220, 255, 0.10), transparent 25%),
    linear-gradient(180deg, var(--bg1) 0%, var(--bg2) 55%, var(--bg3) 100%);
  overflow-x: hidden;
}

.story-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px),
    radial-gradient(circle, rgba(121,224,255,0.08) 1px, transparent 1px);
  background-size: 120px 120px, 180px 180px;
  background-position: 0 0, 60px 40px;
  opacity: 0.25;
}

.top-header {
  position: static;
  backdrop-filter: blur(12px);
  background: rgba(4, 12, 24, 0.62);
  border-bottom: 1px solid rgba(121, 224, 255, 0.12);
}


.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
}

.brand-area h1 {
  font-size: 2rem;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.brand-area p {
  color: var(--muted);
}

.back-link {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
}

.back-link:hover {
  opacity: 0.8;
}

.header-controls {
  display: flex;
  align-items: end;
  gap: 16px;
  flex-wrap: wrap;
}

.control-box {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-box label {
  font-size: 0.9rem;
  color: var(--muted);
}

#seasonSelect,
#fontSizeRange {
  min-width: 180px;
}

#seasonSelect {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.92);
  color: #111;
  font-size: 1rem;
}

.story-layout {
  max-width: 1400px;
  margin: 0 auto;
  padding: 28px 24px 40px;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
}

.sidebar-card,
.reader-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.sidebar-card {
  padding: 22px 18px;
  position: sticky;
  top: 112px;
}

.sidebar-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.sidebar-title-row h2 {
  font-size: 1.1rem;
}

.chapter-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chapter-btn {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid rgba(116, 208, 255, 0.18);
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(21, 43, 71, 0.95), rgba(13, 28, 49, 0.95));
  color: rgba(255,255,255,0.92);
  text-align: left;
  cursor: pointer;
  transition: 0.22s ease;
  line-height: 1.5;
}

.chapter-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(121, 224, 255, 0.42);
  box-shadow: 0 0 20px rgba(0, 180, 255, 0.16);
}

.chapter-btn.active {
  background: linear-gradient(135deg, rgba(29,111,255,0.95), rgba(0,198,255,0.92));
  border-color: rgba(255,255,255,0.35);
  box-shadow: 0 0 20px rgba(0, 200, 255, 0.28);
}

.reader-card {
  padding: 28px;
  min-height: 70vh;
}

.reader-top {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 18px;
  margin-bottom: 12px;
}

.season-label {
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: 0.08em;
  font-size: 0.95rem;
}

#chapterTitle {
  font-size: 1.7rem;
  line-height: 1.4;
}

.story-meta {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.story-text {
  max-width: 860px;
  min-height: 420px;
  line-height: 2.2;
  font-size: 18px;
  white-space: pre-wrap;
  color: var(--text);
  padding: 24px 0;
  transition: opacity 0.25s ease;
}

.story-text.loading {
  opacity: 0.45;
}

.reader-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.nav-btn,
.ghost-btn,
.mini-btn {
  border: none;
  cursor: pointer;
  transition: 0.22s ease;
}

.nav-btn {
  padding: 14px 22px;
  border-radius: 999px;
  font-size: 1rem;
  color: white;
  background: linear-gradient(135deg, var(--btn1), var(--btn2));
  box-shadow: 0 0 18px rgba(0, 180, 255, 0.18);
}

.nav-btn:hover {
  transform: translateY(-1px) scale(1.01);
}

.ghost-btn,
.mini-btn {
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255,255,255,0.08);
  color: white;
  border: 1px solid rgba(255,255,255,0.08);
}

.ghost-btn:hover,
.mini-btn:hover {
  background: rgba(255,255,255,0.14);
}

@media (max-width: 980px) {
  .story-layout {
    grid-template-columns: 1fr;
  }

  .sidebar-card {
    position: static;
  }

  .reader-card {
    min-height: auto;
  }

  .header-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .reader-top {
    flex-direction: column;
  }
}

@media (max-width: 600px) {
  .top-header {
    position: static;
  }

  .story-layout {
    padding: 18px 14px 30px;
    gap: 18px;
  }

  .reader-card,
  .sidebar-card {
    padding: 18px 14px;
    border-radius: 18px;
  }

  .brand-area h1 {
    font-size: 1.6rem;
  }

  #chapterTitle {
    font-size: 1.3rem;
  }

  .story-text {
    font-size: 17px;
    line-height: 2.05;
  }

  .nav-btn {
    width: 100%;
  }
}