:root {
  color-scheme: light;
  --canvas: #e2ded4;
  --paper: #fffaf0;
  --ink: #28251f;
  --muted: #716c62;
  --accent: #526f79;
  --border: rgba(40, 37, 31, .12);
  --reader-size: 20px;
  --reader-line: 1.78;
  --paragraph-gap: 1.1em;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  background: var(--canvas);
  color: var(--ink);
}

* { box-sizing: border-box; }
html, body, #app { min-height: 100%; margin: 0; }
body { min-height: 100dvh; }
button, input { font: inherit; }
button { cursor: pointer; }

.app-shell { min-height: 100dvh; background: var(--canvas); }
.setup-screen { min-height: 100dvh; display: grid; place-items: center; padding: max(28px, env(safe-area-inset-top)) 24px max(28px, env(safe-area-inset-bottom)); }
.setup-card { width: min(100%, 460px); text-align: center; }
.book-mark { width: 62px; height: 62px; margin: 0 auto 20px; display: grid; place-items: center; border-radius: 20px; background: #24333a; color: #fff8e9; font-family: Georgia, serif; font-size: 32px; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 13px; font-weight: 700; letter-spacing: .08em; }
h1 { margin: 0; font-size: clamp(32px, 9vw, 44px); letter-spacing: -.04em; }
.setup-copy { margin: 18px auto 24px; max-width: 360px; color: var(--muted); line-height: 1.65; }
.primary-button, .secondary-button { min-height: 48px; border: 0; border-radius: 14px; padding: 0 18px; font-weight: 750; }
.primary-button { width: min(100%, 320px); background: var(--accent); color: white; box-shadow: 0 8px 18px rgba(45, 66, 72, .22); }
.secondary-button { background: rgba(255,255,255,.62); color: var(--ink); border: 1px solid var(--border); }
.text-button { display: block; margin: 14px auto 0; padding: 8px; border: 0; background: transparent; color: var(--accent); font-weight: 650; }
.status-message { min-height: 20px; margin: 14px auto 0; color: var(--muted); font-size: 13px; line-height: 1.5; }
.status-message.is-error { color: #a33a32; }

.library-screen { min-height: 100dvh; padding: max(18px, env(safe-area-inset-top)) 18px max(28px, env(safe-area-inset-bottom)); }
.library-header { display: flex; align-items: start; justify-content: space-between; gap: 12px; max-width: 780px; margin: 0 auto 20px; }
.library-title { margin: 0; font-size: 30px; letter-spacing: -.04em; }
.library-subtitle { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.header-actions { display: flex; gap: 4px; }
.icon-button { min-width: 44px; min-height: 44px; border: 0; border-radius: 12px; background: transparent; color: var(--ink); font-size: 15px; font-weight: 700; }
.icon-button:hover { background: rgba(255,255,255,.5); }
.library-list { max-width: 780px; margin: 0 auto; display: grid; gap: 10px; }
.book-card { width: 100%; border: 1px solid var(--border); border-radius: 18px; padding: 18px; background: var(--paper); color: var(--ink); text-align: left; box-shadow: 0 3px 12px rgba(63, 54, 42, .05); }
.book-card:active { transform: scale(.99); }
.book-card-title { display: block; font-size: 19px; font-weight: 760; }
.book-card-meta { display: block; margin-top: 6px; color: var(--muted); font-size: 13px; }
.empty-card { padding: 28px 18px; border: 1px dashed var(--border); border-radius: 18px; color: var(--muted); text-align: center; }

.reader-screen { height: 100dvh; display: flex; flex-direction: column; background: var(--canvas); overflow: hidden; }
.reader-header { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 4px; padding: max(4px, env(safe-area-inset-top)) 6px 4px; background: var(--canvas); }
.reader-title-wrap { min-width: 0; text-align: center; }
.reader-title { overflow: hidden; margin: 0; text-overflow: ellipsis; white-space: nowrap; font-size: 15px; font-weight: 780; }
.reader-summary { overflow: hidden; margin: 2px 0 0; color: var(--muted); text-overflow: ellipsis; white-space: nowrap; font-size: 11px; }
.reader-header .icon-button { min-width: 54px; }
.reader-canvas { position: relative; flex: 1; min-height: 0; margin: 0 10px 7px; overflow: hidden; border-radius: 16px; background: var(--paper); box-shadow: 0 5px 22px rgba(55, 46, 32, .08); }
.reader-scroll { height: 100%; overflow-y: auto; overscroll-behavior: contain; padding: 28px 24px calc(34px + env(safe-area-inset-bottom)); -webkit-overflow-scrolling: touch; }
.reader-text { margin: 0 auto; max-width: 760px; font-size: var(--reader-size); line-height: var(--reader-line); font-family: var(--reader-font, Georgia, "Nanum Myeongjo", serif); word-break: keep-all; overflow-wrap: anywhere; }
.reader-text p { margin: 0 0 var(--paragraph-gap); }
.reader-text h2 { margin: 1.2em 0 .75em; font-size: 1.2em; line-height: 1.45; }
.reader-text blockquote { margin: 0 0 var(--paragraph-gap); padding-left: .9em; border-left: 3px solid color-mix(in srgb, var(--accent) 55%, transparent); color: color-mix(in srgb, var(--ink) 82%, var(--muted)); }
.reader-text .divider { margin: 1.5em 0; color: var(--muted); text-align: center; letter-spacing: .42em; }
.reader-text ul { margin: 0 0 var(--paragraph-gap); padding-left: 1.35em; }
.progress-panel { position: absolute; z-index: 2; top: 0; right: 0; left: 0; padding: 8px 16px 10px; background: color-mix(in srgb, var(--paper) 96%, transparent); border-bottom: 1px solid var(--border); box-shadow: 0 6px 14px rgba(47, 41, 31, .12); }
.progress-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 11px; }
.progress-control { display: grid; grid-template-columns: 26px 1fr 35px; align-items: center; gap: 7px; margin-top: 5px; color: var(--muted); font-size: 10px; }
.progress-control input { width: 100%; accent-color: var(--accent); }
.settings-sheet { position: absolute; z-index: 4; right: 12px; bottom: 12px; left: 12px; max-width: 560px; margin: auto; padding: 18px; border: 1px solid var(--border); border-radius: 20px; background: var(--paper); box-shadow: 0 16px 42px rgba(38, 32, 21, .28); }
.settings-title { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; font-size: 17px; font-weight: 800; }
.settings-group { margin-top: 13px; }
.settings-label { display: flex; justify-content: space-between; margin-bottom: 6px; font-size: 13px; font-weight: 700; }
.settings-label span { color: var(--muted); font-weight: 500; }
.settings-group input[type="range"] { width: 100%; accent-color: var(--accent); }
.choice-row { display: flex; flex-wrap: wrap; gap: 7px; }
.choice { border: 1px solid var(--border); border-radius: 999px; padding: 7px 11px; background: transparent; color: var(--ink); font-size: 13px; }
.choice.is-selected { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, var(--paper)); color: #25424b; font-weight: 750; }
.loading { display: grid; min-height: 180px; place-items: center; color: var(--muted); }

[data-theme="sepia"] { --canvas: #b8a689; --paper: #f0e0ba; --ink: #382b1a; --muted: #73624a; --accent: #776146; }
[data-theme="night"] { color-scheme: dark; --canvas: #131518; --paper: #222429; --ink: #d7d7d7; --muted: #a6a7aa; --accent: #9bbbc3; --border: rgba(255,255,255,.13); }
[data-font="sans"] { --reader-font: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif; }

@media (min-width: 760px) {
  .reader-canvas { margin: 0 auto 14px; width: min(100% - 40px, 980px); }
  .reader-scroll { padding-right: 54px; padding-left: 54px; }
}