:root {
  color-scheme: dark;
  --navy: #0d1430; --gold: #d0ad64; --ink: #f8f7f3; --muted: #bac2d6;
  --app-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-text-size-adjust: 100%;
}
@supports (height: 100dvh) { :root { --app-height: 100dvh; } }
* { box-sizing: border-box; }
html, body { margin: 0; width: 100%; height: 100%; overflow: hidden; }
body { color: var(--ink); background: var(--navy); }
button, input { font: inherit; }
button { color: inherit; cursor: pointer; touch-action: manipulation; }
button:disabled { opacity: .3; cursor: default; }
button, a, input { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }
[hidden] { display: none !important; }
.icon-defs { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex: 0 0 auto; }
.app { width: 100%; height: var(--app-height); display: grid; grid-template-rows: auto minmax(0,1fr); background: radial-gradient(ellipse at 50% 30%, #303b5c, #111a35 65%, #0d1430); }
.brandbar { min-height: 94px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 20px; padding: calc(8px + env(safe-area-inset-top)) max(24px, env(safe-area-inset-right)) 8px max(24px, env(safe-area-inset-left)); color: #14213a; background: white; border-bottom: 2px solid var(--gold); }
.brand { display: inline-flex; width: max-content; min-height: 44px; align-items: center; }
.brand-logo { width: auto; height: 72px; display: block; object-fit: contain; }
.brandbar h1 { font: 400 22px Georgia, serif; letter-spacing: .025em; margin: 0; }
.website-link { justify-self: end; display: flex; align-items: center; gap: 12px; min-height: 44px; color: #14213a; text-decoration: none; }
.website-link:hover strong { text-decoration: underline; text-underline-offset: 4px; }
.website-label { display: block; font-size: 13px; line-height: 1.5; }
.website-link strong { display: block; font-size: 17px; line-height: 1.4; }
.reader { min-height: 0; display: grid; grid-template-rows: auto minmax(0,1fr) auto auto; }
.rotate-notice { display: none; }
.book-stage { grid-row: 2; position: relative; min-height: 0; display: flex; align-items: center; justify-content: center; overflow: hidden; padding: 16px max(64px, env(safe-area-inset-right)) 16px max(64px, env(safe-area-inset-left)); touch-action: none; overscroll-behavior: contain; user-select: none; -webkit-user-select: none; }
.pan-layer { flex: 0 0 auto; width: 800px; height: 365px; position: relative; transform-origin: center; }
.book { position: relative; width: 100%; height: 100%; perspective: 2400px; -webkit-perspective: 2400px; transform-style: preserve-3d; }
.page { position: absolute; top: 0; width: 50%; height: 100%; margin: 0; background: #fff; box-shadow: 0 12px 30px #0005; cursor: grab; }
.page-left { left: 0; }
.page-right { right: 0; }
.page.is-empty { visibility: hidden; }
.page img, .leaf-face img { display: block; width: 100%; height: 100%; object-fit: contain; pointer-events: none; -webkit-user-drag: none; }
.book-stage.is-dragging .page, .book-stage.is-zoomed .page { cursor: grabbing; }
.book-spine { position: absolute; left: 50%; top: 0; width: 14px; height: 100%; transform: translateX(-50%); z-index: 3; pointer-events: none; background: linear-gradient(90deg, transparent, #0002 45%, #fff2 52%, transparent); }
.turn-leaf { position: absolute; top: 0; width: 50%; height: 100%; z-index: 6; transform-style: preserve-3d; -webkit-transform-style: preserve-3d; pointer-events: none; }
.turn-leaf.forward { left: 50%; transform-origin: left center; }
.turn-leaf.backward { left: 0; transform-origin: right center; }
.leaf-face { position: absolute; inset: 0; background: white; backface-visibility: hidden; -webkit-backface-visibility: hidden; box-shadow: 0 6px 16px #0003; }
.leaf-front { transform: rotateY(0deg) translateZ(.2px); }
.leaf-back { transform: rotateY(180deg) translateZ(.2px); }
.leaf-shade { position: absolute; inset: 0; background: linear-gradient(90deg, #0009, transparent 80%); opacity: var(--shade, 0); }
.leaf-back .leaf-shade { background: linear-gradient(270deg, #0009, transparent 80%); }
.turn-shadow { position: absolute; inset: 0; z-index: 4; pointer-events: none; background: linear-gradient(90deg, transparent 25%, #0008 50%, transparent 75%); opacity: 0; }
.edge-button { position: absolute; top: 50%; transform: translateY(-50%); z-index: 10; display: grid; place-items: center; width: 44px; height: 56px; border: 1px solid #ffffff25; border-radius: 12px; background: #101830cc; }
.edge-prev { left: max(10px, env(safe-area-inset-left)); }
.edge-next { right: max(10px, env(safe-area-inset-right)); }
.loading { position: absolute; z-index: 12; bottom: 22px; padding: 10px 18px; border-radius: 24px; font-size: 14px; background: #0d1430ee; box-shadow: 0 2px 12px #0004; }
.page-error { position: absolute; z-index: 13; max-width: min(340px, 90%); padding: 20px; border: 1px solid var(--gold); border-radius: 12px; background: #0d1430f5; text-align: center; font-size: 14px; }
.page-error button { min-height: 44px; padding: 8px 20px; border: 1px solid var(--gold); border-radius: 8px; background: transparent; }
.reading-meta { grid-row: 3; display: flex; justify-content: center; gap: 24px; padding: 3px 16px 11px; font-size: 12px; line-height: 1.4; color: var(--muted); }
#spreadLabel { color: var(--ink); }
.toolbar { grid-row: 4; display: flex; align-items: center; justify-content: center; gap: 20px; padding: 10px max(12px, env(safe-area-inset-right)) calc(10px + env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left)); border-top: 1px solid #ffffff18; background: #0d1430ee; flex-wrap: wrap; }
.tool-group { display: flex; align-items: center; justify-content: center; gap: 5px; }
.toolbar button:not(.sr-only), .thumbnail-head button { display: grid; place-items: center; flex: 0 0 44px; width: 44px; height: 44px; padding: 0; border: 1px solid #ffffff20; border-radius: 9px; background: #ffffff08; }
@media (hover: hover) { button:hover:not(:disabled) { background-color: #d0ad6424; border-color: var(--gold); } }
.page-jump { display: flex; align-items: center; gap: 5px; height: 44px; margin: 0 3px; padding: 0 9px; border: 1px solid #ffffff20; border-radius: 9px; font-size: 12px; color: var(--muted); }
.page-jump input { width: 31px; height: 34px; border: 0; border-bottom: 1px solid var(--gold); border-radius: 0; background: transparent; color: white; text-align: center; font-size: 16px; }
.zoom-label { min-width: 42px; text-align: center; font-size: 12px; color: var(--muted); }
.thumbnail-panel { width: min(560px,94vw); max-height: 88vh; max-height: 88dvh; padding: 0; border: 1px solid #d0ad6466; border-radius: 16px; background: #131e38; color: var(--ink); box-shadow: 0 20px 70px #0008; overflow: hidden; }
.thumbnail-panel[open] { display: flex; flex-direction: column; }
.thumbnail-panel::backdrop { background: #03091ac9; }
.thumbnail-head { display: flex; justify-content: space-between; align-items: center; padding: 16px 18px; border-bottom: 1px solid #ffffff18; }
.thumbnail-head h2 { margin: 0 0 4px; font: 22px Georgia, serif; }
.thumbnail-head span { font-size: 12px; color: var(--muted); }
.thumbnail-grid { min-height: 0; overflow: auto; -webkit-overflow-scrolling: touch; overscroll-behavior: contain; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; padding: 16px; }
.thumb { padding: 6px; border: 1px solid #ffffff18; border-radius: 8px; background: #ffffff08; }
.thumb img { display: block; width: 100%; aspect-ratio: 3260 / 2975; object-fit: contain; background: #fff; }
.thumb span { display: block; padding: 7px 0 2px; font-size: 12px; }
.thumb[aria-current="page"] { border-color: var(--gold); background: #d0ad6426; }
.toast { position: fixed; left: 50%; bottom: calc(145px + env(safe-area-inset-bottom)); transform: translateX(-50%); z-index: 50; width: max-content; max-width: 90vw; padding: 12px 18px; border: 1px solid #d0ad6466; border-radius: 10px; background: #0d1430f5; font-size: 13px; text-align: center; }
.app.is-expanded { grid-template-rows: 0 minmax(0,1fr); }
.app.is-expanded .brandbar { visibility: hidden; min-height: 0; padding: 0; overflow: hidden; }
.app:fullscreen, .app:-webkit-full-screen { height: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
noscript { position: fixed; inset: 100px 20px auto; background: white; color: #111; padding: 20px; z-index: 100; }
@media (max-width: 900px) {
  .brandbar { grid-template-columns: 1fr auto; }
  .brandbar h1 { display: none; }
}
@media (max-width: 600px) {
  .brandbar { min-height: 84px; padding-left: 18px; padding-right: 18px; gap: 12px; }
  .brand-logo { height: 66px; }
  .website-label { font-size: 12px; }
  .website-link strong { font-size: 16px; }
  .website-link { gap: 7px; }
  .website-link .icon { width: 17px; height: 17px; }
  .book-stage { padding: 12px 44px; }
  .edge-button { border: 0; background: transparent; }
  .edge-prev { left: 0; } .edge-next { right: 0; }
  .toolbar { gap: 6px; padding-top: 8px; padding-bottom: calc(8px + env(safe-area-inset-bottom)); }
  .view-tools { flex-basis: 100%; }
  #gestureHint { display: none; }
  .thumbnail-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 900px) and (orientation: portrait) {
  .rotate-notice { grid-row: 1; display: flex; align-items: center; gap: 13px; margin: 14px 16px 0; padding: 13px 15px; border: 1px solid #d0ad6470; border-radius: 12px; background: #0d143096; }
  .rotate-notice .icon { width: 28px; height: 28px; color: var(--gold); }
  .rotate-notice strong { font-size: 14px; font-weight: 600; }
  .rotate-notice p { margin: 5px 0 0; font-size: 12px; line-height: 1.55; color: #d4d9e5; }
}
@media (orientation: landscape) and (max-height: 600px) {
  .brandbar { min-height: 48px; padding-top: 3px; padding-bottom: 3px; padding-left: max(18px,env(safe-area-inset-left)); padding-right: max(18px,env(safe-area-inset-right)); }
  .brand-logo { height: 40px; }
  .website-link > span { display: flex; gap: 8px; align-items: baseline; }
  .website-label { font-size: 12px; }
  .website-link strong { font-size: 14px; }
  .book-stage { padding: 6px max(48px,env(safe-area-inset-right)) 6px max(48px,env(safe-area-inset-left)); }
  .edge-prev { left: max(2px,env(safe-area-inset-left)); } .edge-next { right: max(2px,env(safe-area-inset-right)); }
  .reading-meta { padding: 1px 12px 3px; font-size: 11px; }
  #gestureHint { display: none; }
  .toolbar { gap: 12px; padding-top: 4px; padding-bottom: calc(4px + env(safe-area-inset-bottom)); flex-wrap: nowrap; }
  .view-tools { flex-basis: auto; }
  .page-jump label, .zoom-label { display: none; }
  .tool-group { gap: 3px; }
  .thumbnail-panel { width: min(700px,94vw); }
  .thumbnail-grid { grid-template-columns: repeat(5,minmax(0,1fr)); }
}
@media (orientation: landscape) and (max-width: 700px) {
  .toolbar { gap: 6px; padding-left: 4px; padding-right: 4px; }
  .tool-group { gap: 1px; }
  .page-jump { margin: 0; padding: 0 5px; }
  .website-label { display: none; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; } }
@media (max-width: 360px) {
  .page-jump label { display: none; }
  .page-jump { margin: 0; padding-left: 7px; padding-right: 7px; }
  .brandbar { padding-left: 12px; padding-right: 12px; }
}