:root {
  --bg: #0a1116;
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.75);
  --muted2: rgba(255, 255, 255, 0.62);
  --border: rgba(255, 255, 255, 0.14);
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.58);
  --radius: 16px;
  --radius-sm: 12px;
  --accent: #d9b15d;
  --accent2: #b6423c;
  --paper: #f3e6cf;
  --ink: #1b1a17;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial,
    "Apple Color Emoji",
    "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
}

a {
  color: inherit;
}

.header {
  padding: 28px 16px 14px;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.title {
  margin: 0;
  font-family:
    ui-serif,
    Georgia,
    "Times New Roman",
    Times,
    serif;
  font-size: clamp(24px, 3vw, 40px);
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 8px 0 0;
  color: var(--muted);
}

.note {
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  background:
    radial-gradient(700px 240px at 15% 20%, rgba(217, 177, 93, 0.22), transparent 55%),
    radial-gradient(520px 220px at 90% 35%, rgba(182, 66, 60, 0.14), transparent 60%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0.06));
  box-shadow: 0 14px 46px rgba(0, 0, 0, 0.32);
}

.note p {
  margin: 0 0 10px;
  color: rgba(255, 255, 255, 0.86);
  line-height: 1.45;
}

.note p:last-child {
  margin-bottom: 0;
}

.note-script {
  font-family:
    "Snell Roundhand",
    "Apple Chancery",
    "Bradley Hand",
    "Segoe Script",
    "Brush Script MT",
    cursive;
  font-size: 19px;
}

.note-lead {
  font-weight: 700;
  letter-spacing: -0.01em;
  color: rgba(255, 255, 255, 0.95);
}

.signature {
  color: rgba(255, 255, 255, 0.95);
  font-weight: 800;
}

.main {
  padding: 0 16px 30px;
}

.viewer {
  max-width: 1100px;
  margin: 0 auto;
}

.toolbar {
  position: sticky;
  top: 10px;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  background:
    radial-gradient(520px 140px at 15% 30%, rgba(217, 177, 93, 0.18), transparent 60%),
    radial-gradient(520px 140px at 85% 40%, rgba(182, 66, 60, 0.12), transparent 62%),
    rgba(12, 18, 22, 0.86);
  backdrop-filter: blur(10px);
}

.divider {
  width: 1px;
  height: 28px;
  background: var(--border);
}

.spacer {
  flex: 1;
}

.btn {
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.09);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.btn:active {
  transform: translateY(1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
}

.page-jump {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-weight: 600;
}

.page-input {
  width: 70px;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  outline: none;
}

.page-input:focus {
  border-color: rgba(217, 177, 93, 0.65);
  box-shadow: 0 0 0 4px rgba(217, 177, 93, 0.14);
}

.page-total {
  color: var(--muted2);
}

.book-wrap {
  margin-top: 16px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background:
    radial-gradient(900px 420px at 20% 10%, rgba(243, 230, 207, 0.10), transparent 55%),
    radial-gradient(900px 420px at 80% 18%, rgba(217, 177, 93, 0.10), transparent 58%),
    radial-gradient(900px 420px at 50% 90%, rgba(182, 66, 60, 0.08), transparent 62%),
    rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow);
  padding: 18px;
}

.book {
  width: min(980px, 100%);
  height: clamp(520px, 68vh, 760px);
  margin: 4px auto 0;
}

.page {
  background: #ffffff;
  width: 100%;
  height: 100%;
}

.page img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  cursor: zoom-in;
}

.hint {
  margin: 12px 6px 0;
  color: var(--muted2);
}

.dialog {
  width: min(1060px, calc(100vw - 24px));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  background: rgba(10, 15, 28, 0.92);
  backdrop-filter: blur(12px);
  color: var(--text);
  box-shadow: var(--shadow);
}

.dialog::backdrop {
  background: rgba(0, 0, 0, 0.65);
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 14px 12px;
  border-bottom: 1px solid var(--border);
}

.dialog-title {
  font-weight: 800;
  letter-spacing: -0.01em;
}

.dialog-actions {
  display: inline-flex;
  gap: 10px;
  align-items: center;
}

.grid {
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}

.thumb {
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}

.thumb:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.09);
}

.thumb img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  display: block;
}

.thumb .thumb-label {
  padding: 8px 10px;
  color: var(--muted);
  font-weight: 700;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-dialog {
  width: min(1200px, calc(100vw - 24px));
}

.page-preview {
  padding: 14px;
}

.page-preview img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: #ffffff;
}

@media (max-width: 720px) {
  .toolbar {
    flex-wrap: wrap;
  }

  .divider,
  .spacer {
    display: none;
  }

  .book {
    height: 66vh;
  }
}