/* ===================== Theme tokens ===================== */
:root {
  --reader-font-size: 19px;
  --reader-measure: 38rem;

  --bg: #15171b;
  --bg-elev: #1d2026;
  --bg-elev2: #262a32;
  --text: #e6e8ec;
  --text-dim: #9aa1ad;
  --border: #2f343d;
  --accent: #4f86ff;
  --accent-text: #ffffff;
  --danger: #ff6b8a;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.45);

  --serif: ui-serif, "Noto Serif KR", "Nanum Myeongjo", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", "Noto Sans KR", "Malgun Gothic", sans-serif;
}

:root[data-theme="light"] {
  --bg: #faf7f0;
  --bg-elev: #ffffff;
  --bg-elev2: #f1ece1;
  --text: #20242b;
  --text-dim: #6b7280;
  --border: #e3ddd0;
  --accent: #2f6bff;
  --accent-text: #ffffff;
  --danger: #d6336c;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-text-size-adjust: 100%;
}

body { min-height: 100dvh; }

/* ===================== Views ===================== */
.view { display: none; }
.view.is-active { display: block; }

/* ===================== Top bars ===================== */
.topbar,
.readerbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.9rem;
  padding-top: calc(0.6rem + env(safe-area-inset-top));
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}

.topbar__title { font-size: 1.05rem; margin: 0; font-weight: 700; }
.topbar__actions { margin-left: auto; display: flex; gap: 0.4rem; }

.readerbar__meta {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.readerbar__title {
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.readerbar__progress { font-size: 0.72rem; color: var(--text-dim); }
.readerbar__actions { display: flex; gap: 0.25rem; }

/* ===================== Buttons ===================== */
.btn {
  font: inherit;
  color: var(--text);
  background: var(--bg-elev2);
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  line-height: 1;
  transition: background 0.15s, border-color 0.15s, transform 0.05s;
}
.btn:hover { background: var(--bg-elev); }
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: transparent;
  font-weight: 600;
}
.btn--primary:hover { filter: brightness(1.07); background: var(--accent); }
.btn--icon { padding: 0.45rem 0.55rem; min-width: 2.2rem; }

/* ===================== Library ===================== */
.library {
  list-style: none;
  margin: 0 auto;
  padding: 0.6rem;
  max-width: 46rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.library__item {
  display: flex;
  align-items: stretch;
  gap: 0.4rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  overflow: hidden;
}
.library__open {
  flex: 1;
  min-width: 0;
  text-align: left;
  background: transparent;
  border: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.library__open:hover { background: var(--bg-elev2); }
.library__name {
  font-size: 1rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.library__meta { display: flex; align-items: center; gap: 0.5rem; }
.library__bar {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: var(--bg-elev2);
  overflow: hidden;
}
.library__bar-fill { display: block; height: 100%; background: var(--accent); }
.library__pct { font-size: 0.74rem; color: var(--text-dim); min-width: 2.6rem; text-align: right; }
.library__del {
  border: 0;
  border-left: 1px solid var(--border);
  border-radius: 0;
  background: transparent;
  color: var(--text-dim);
  padding: 0 0.85rem;
}
.library__del:hover { background: var(--bg-elev2); color: var(--danger); }

/* ===================== Empty / status ===================== */
.empty {
  max-width: 34rem;
  margin: 3rem auto;
  padding: 0 1.2rem;
  text-align: center;
  color: var(--text-dim);
}
.empty__title { font-size: 1.1rem; color: var(--text); font-weight: 600; }
.empty__hint { line-height: 1.7; font-size: 0.92rem; }
.empty code,
.dialog code {
  background: var(--bg-elev2);
  padding: 0.05rem 0.35rem;
  border-radius: 0.35rem;
  font-size: 0.9em;
}
.status { padding: 0.8rem 1rem; color: var(--text-dim); text-align: center; }
.status--center { margin: 4rem auto; }

/* ===================== Reader ===================== */
.reader {
  max-width: var(--reader-measure);
  margin: 0 auto;
  padding: 1.4rem 1.25rem 40vh;
  padding-left: max(1.25rem, env(safe-area-inset-left));
  padding-right: max(1.25rem, env(safe-area-inset-right));
  font-size: var(--reader-font-size);
  line-height: 1.95;
  letter-spacing: 0.01em;
  outline: none;
}
:root[data-serif="on"] .reader { font-family: var(--serif); }

.reader p { margin: 0 0 1.15em; }
.reader h1, .reader h2, .reader h3, .reader h4 {
  line-height: 1.4;
  margin: 1.8em 0 0.7em;
  font-family: var(--sans);
}
.reader h1 { font-size: 1.5em; }
.reader h2 { font-size: 1.3em; }
.reader h3 { font-size: 1.12em; }
.reader hr { border: 0; border-top: 1px solid var(--border); margin: 2.2em 0; }
.reader blockquote {
  margin: 1.2em 0;
  padding: 0.2em 1em;
  border-left: 3px solid var(--accent);
  color: var(--text-dim);
}
.reader img { max-width: 100%; height: auto; border-radius: 0.5rem; }
.reader a { color: var(--accent); text-underline-offset: 2px; }
.reader code {
  background: var(--bg-elev2);
  padding: 0.05em 0.35em;
  border-radius: 0.3rem;
  font-size: 0.92em;
}
.reader pre {
  background: var(--bg-elev2);
  padding: 0.9em 1em;
  border-radius: 0.6rem;
  overflow-x: auto;
}
.reader pre code { background: none; padding: 0; }
.reader em { font-style: italic; }
.reader strong { font-weight: 700; }

/* Resume banner */
.resume-banner {
  position: fixed;
  left: 50%;
  bottom: calc(1.4rem + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 30;
  background: var(--accent);
  color: var(--accent-text);
  border: 0;
  border-radius: 999px;
  padding: 0.6rem 1.1rem;
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: var(--shadow);
}

/* Reading progress bar (top of reader, under the bar) */
.progressbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 25;
  background: transparent;
  pointer-events: none;
}
.progressbar__fill { height: 100%; width: 0; background: var(--accent); transition: width 0.1s linear; }

/* ===================== Dialog ===================== */
.dialog {
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--bg-elev);
  color: var(--text);
  padding: 0;
  width: min(28rem, 92vw);
  box-shadow: var(--shadow);
}
.dialog::backdrop { background: rgba(0, 0, 0, 0.5); }
.dialog__form { padding: 1.3rem; display: flex; flex-direction: column; gap: 0.85rem; }
.dialog__title { margin: 0; font-size: 1.15rem; }
.dialog__desc { margin: 0; color: var(--text-dim); font-size: 0.85rem; line-height: 1.6; }
.field { display: flex; flex-direction: column; gap: 0.3rem; }
.field--check { flex-direction: row; align-items: flex-start; gap: 0.5rem; }
.field__label { font-size: 0.85rem; font-weight: 600; }
.field__opt { color: var(--text-dim); font-weight: 400; }
.field__input {
  font: inherit;
  padding: 0.55rem 0.65rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.field__input:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
.dialog__status { font-size: 0.85rem; color: var(--danger); }
.dialog__actions { display: flex; justify-content: flex-end; gap: 0.5rem; margin-top: 0.3rem; }

/* ===================== Toast ===================== */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(1.5rem + env(safe-area-inset-bottom));
  transform: translate(-50%, 1rem);
  z-index: 50;
  background: var(--bg-elev2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  padding: 0.7rem 1.1rem;
  font-size: 0.9rem;
  max-width: min(30rem, 90vw);
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
}
.toast--show { opacity: 1; transform: translate(-50%, 0); }

@media (prefers-reduced-motion: reduce) {
  .toast, .progressbar__fill, .btn { transition: none; }
}