/* โหมดอ่าน PDF — ธีมมืดเป็นหลักเพื่อถนอมสายตาเวลาอ่านนาน ๆ */
@import url("../ui/fonts/sarabun.css");
:root {
  --bg: #14161b;
  --bg-soft: #1b1e25;
  --bg-elev: #22262f;
  --fg: #e8ecf3;
  --fg-muted: #99a3b3;
  --border: #2c323d;
  --accent: #2dd4bf;
  --accent-fg: #06231f;
  --danger: #f87171;
  --toolbar-h: 46px;
}
:root[data-theme="light"] {
  --bg: #eceef2;
  --bg-soft: #ffffff;
  --bg-elev: #f7f8fa;
  --fg: #14181f;
  --fg-muted: #5c6675;
  --border: #d9dee7;
  --accent: #0f766e;
  --accent-fg: #ffffff;
}
:root[data-theme="sepia"] {
  --bg: #e9dfc6;
  --bg-soft: #fbf6e9;
  --bg-elev: #f1e7cf;
  --fg: #3b2f20;
  --fg-muted: #6f5f45;
  --border: #d9caa5;
  --accent: #0f766e;
  --accent-fg: #ffffff;
  --danger: #a51c1c;
}
:root[data-theme="night"] {
  --bg: #000000;
  --bg-soft: #0c0d0f;
  --bg-elev: #15171a;
  --fg: #cfd4dc;
  --fg-muted: #8b929d;
  --border: #23262b;
  --accent: #5eb8ae;
  --accent-fg: #001a17;
  --danger: #e67c7c;
}

* { box-sizing: border-box; }
/* สำคัญ: คลาสที่มี display กำหนดไว้จะทับ attribute hidden ทำให้ overlay ที่ซ่อนอยู่ยังบล็อกการคลิก */
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: "Sarabun", "Noto Sans Thai", "Leelawadee UI", "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  overflow: hidden;
}

/* ---------- toolbar ---------- */
.toolbar {
  height: var(--toolbar-h);
  display: flex; align-items: center; gap: 10px;
  padding: 0 10px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  position: relative; z-index: 20;
}
.tb-group { display: flex; align-items: center; gap: 4px; }
.tb-spacer { flex: 1; }
.tb-btn {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 10px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--fg);
  font-size: 13px; cursor: pointer; font-family: inherit; white-space: nowrap;
  text-decoration: none;
}
.tb-btn:hover { border-color: var(--accent); color: var(--accent); }
.tb-btn.is-active { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); font-weight: 600; }
.tb-btn[disabled] { opacity: .45; cursor: default; }
.tb-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); font-weight: 600; }
.tb-input {
  width: 58px; padding: 5px 6px; text-align: center;
  border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--fg); font-family: inherit; font-size: 13px;
}
.tb-label { color: var(--fg-muted); font-size: 12.5px; white-space: nowrap; }
.tb-title {
  max-width: 34vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: var(--fg-muted); font-size: 12.5px;
}

/* ---------- layout ---------- */
.layout { display: flex; height: calc(100% - var(--toolbar-h)); }
.sidebar {
  width: 260px; flex: 0 0 260px;
  background: var(--bg-soft); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 0;
}
.side-tabs { display: flex; border-bottom: 1px solid var(--border); }
.side-tab {
  flex: 1; padding: 9px 6px; border: 0; background: transparent; color: var(--fg-muted);
  cursor: pointer; font-family: inherit; font-size: 13px; border-bottom: 2px solid transparent;
}
.side-tab.is-active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.side-pane { flex: 1; overflow: auto; padding: 8px; min-height: 0; }
.outline-item {
  display: block; width: 100%; text-align: left; padding: 5px 7px; border-radius: 7px;
  border: 0; background: transparent; color: var(--fg); cursor: pointer; font-family: inherit; font-size: 13px;
}
.outline-item:hover { background: var(--bg-elev); color: var(--accent); }
.thumb {
  display: block; width: 100%; margin: 0 0 8px; padding: 0; border: 1px solid var(--border);
  border-radius: 6px; overflow: hidden; cursor: pointer; background: #fff; position: relative;
}
.thumb.is-active { outline: 2px solid var(--accent); }
.thumb canvas { display: block; width: 100%; height: auto; }
.thumb-label {
  position: absolute; bottom: 0; right: 0; background: rgba(0,0,0,.6); color: #fff;
  font-size: 10px; padding: 1px 5px; border-top-left-radius: 6px;
}
.search-row { display: flex; gap: 5px; margin-bottom: 8px; }
.search-row input {
  flex: 1; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--fg); font-family: inherit; font-size: 13px;
}
.search-results { display: flex; flex-direction: column; gap: 5px; }
.search-hit {
  text-align: left; padding: 7px 8px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--fg); cursor: pointer; font-family: inherit; font-size: 12.5px;
}
.search-hit:hover { border-color: var(--accent); }
.search-hit b { color: var(--accent); }

/* ---------- pages ---------- */
.viewport { flex: 1; overflow: auto; position: relative; padding: 16px 0 60px; min-width: 0; }
.pages { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.page {
  position: relative; background: #fff; box-shadow: 0 3px 14px rgba(0,0,0,.35);
  border-radius: 3px; overflow: hidden;
}
.page canvas { display: block; }
/* ย้อมสีหน้า PDF ให้เข้ากับธีม: กระดาษ = พื้นขาวกลายเป็นเหลืองอ่อน (multiply ทำให้ตัวอักษรยังเข้มเท่าเดิม),
   กลางคืน = กลับสีเป็นพื้นเข้มตัวอักษรอ่อน (รูปภาพจะกลับสีด้วย) */
:root[data-theme="sepia"] .page { background: #f6eedb; }
:root[data-theme="sepia"] .page canvas { mix-blend-mode: multiply; }
:root[data-theme="night"] .page canvas { filter: invert(.86) hue-rotate(180deg); }
:root[data-theme="night"] .page { background: #242424; box-shadow: none; }
.page-loading {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #8892a4; font-size: 12px; background: #fafbfc;
}
.page-num {
  position: absolute; bottom: -11px; right: 6px; font-size: 11px;
  color: var(--fg-muted); background: var(--bg); padding: 0 5px; border-radius: 6px;
}

/* text layer ของ pdf.js */
.textLayer {
  position: absolute; text-align: initial; inset: 0;
  overflow: clip; opacity: 1; line-height: 1;
  -webkit-text-size-adjust: none; text-size-adjust: none;
  forced-color-adjust: none; transform-origin: 0 0;
  caret-color: CanvasText; z-index: 2;
}
.textLayer span, .textLayer br {
  color: transparent; position: absolute; white-space: pre;
  cursor: text; transform-origin: 0% 0%;
}
.textLayer ::selection { background: rgba(45,212,191,.35); }
.textLayer .highlight { background: rgba(255,214,10,.45); border-radius: 2px; }
.textLayer .endOfContent {
  display: block; position: absolute; inset: 100% 0 0; z-index: -1;
  cursor: default; user-select: none;
}

/* ---------- โหมดอ่าน (ข้อความไหลตามจอ) ---------- */
body.is-reading .tb-pdf-only { display: none; }
.reader {
  --rd-size: 18px; --rd-lh: 1.8; --rd-width: 38em;
  max-width: calc(var(--rd-width) + 48px); margin: 0 auto; padding: 0 16px;
  font-size: var(--rd-size);
}
.rd-bar {
  position: sticky; top: 0; z-index: 5;
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  margin: -16px -16px 16px; padding: 12px 16px;
  background: var(--bg); border-bottom: 1px solid var(--border);
}
.rd-bar .tb-btn, .rd-nav .tb-btn { font-size: 14px; }
/* ปุ่มเปิด/ปิดที่กดอยู่ใช้สีอ่อน เพื่อไม่ให้แข่งกับปุ่มหลัก (หน้าถัดไป) */
.rd-bar .tb-btn.is-active {
  background: color-mix(in srgb, var(--accent) 14%, var(--bg-elev)); color: var(--accent);
  border-color: var(--accent); font-weight: 600;
}
.rd-settings {
  display: flex; flex-direction: column; gap: 12px;
  margin-bottom: 16px; padding: 16px;
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px;
}
.rd-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.rd-row > .tb-label { min-width: 120px; }
.rd-seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.rd-seg button {
  padding: 6px 12px; border: 0; border-right: 1px solid var(--border);
  background: var(--bg-elev); color: var(--fg); font-family: inherit; font-size: 14px; cursor: pointer;
}
.rd-seg button:last-child { border-right: 0; }
.rd-seg button.is-active { background: var(--accent); color: var(--accent-fg); font-weight: 600; }
.rd-check { cursor: pointer; color: var(--fg); }
.rd-check input { width: 18px; height: 18px; accent-color: var(--accent); }

.rd-article {
  position: relative;
  max-width: var(--rd-width); margin: 0 auto;
  padding: 24px; border-radius: 8px;
  background: var(--bg-soft); border: 1px solid var(--border);
  line-height: var(--rd-lh);
}
.rd-block + .rd-block { margin-top: 1em; }
.rd-para { margin: 0; color: var(--fg); position: relative; z-index: 1; }
.rd-th {
  margin: .4em 0 0; padding-left: 12px; border-left: 3px solid var(--accent);
  color: var(--fg-muted); font-size: .92em; position: relative; z-index: 1;
}
.rd-th:empty { display: none; }
.rd-th.is-pending { font-style: italic; }
.rd-th.is-error { color: var(--danger); cursor: pointer; }
.rd-known {
  background: color-mix(in srgb, var(--accent) 16%, transparent); color: inherit;
  border-bottom: 2px dotted var(--accent); border-radius: 3px; padding: 0 1px; cursor: pointer;
}
.rd-status { margin: 0; color: var(--fg-muted); font-size: 15px; }
/* แถบไล่บรรทัด: ไฮไลต์จาง ๆ ตามบรรทัดที่กำลังอ่าน */
.rd-ruler-band {
  position: absolute; left: 0; right: 0; top: 0; z-index: 0; pointer-events: none;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-top: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  transition: transform .06s linear;
}

.rd-digest {
  max-width: var(--rd-width); margin: 0 auto 16px; padding: 16px 24px;
  background: var(--bg-soft); border: 1px solid var(--accent); border-radius: 8px;
  font-size: 15px; line-height: 1.7;
}
.rd-digest h3 { margin: 0 0 8px; font-size: 15px; color: var(--accent); }
.rd-digest ul { margin: 0 0 16px; padding-left: 20px; }
.rd-digest .tb-btn { margin-top: 8px; }
.rd-quiz { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 16px; }
.rd-q { margin: 0 0 8px; font-weight: 600; }
.rd-choices { display: flex; flex-direction: column; gap: 8px; }
.rd-choice {
  text-align: left; padding: 8px 12px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--fg); font-family: inherit; font-size: 15px;
}
.rd-choice:hover:not([disabled]) { border-color: var(--accent); }
.rd-choice[disabled] { cursor: default; }
.rd-choice.is-correct { border-color: var(--ok, #16a34a); background: color-mix(in srgb, #16a34a 16%, var(--bg-elev)); }
.rd-choice.is-wrong { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 14%, var(--bg-elev)); }
.rd-explain { margin: 8px 0 0; color: var(--fg-muted); }

.rd-nav {
  max-width: var(--rd-width); margin: 16px auto 0;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}

/* ---------- translation panel ---------- */
.trans-panel {
  width: 420px; flex: 0 0 420px; background: var(--bg-soft);
  border-left: 1px solid var(--border); display: flex; flex-direction: column; min-height: 0;
}
.trans-head {
  display: flex; align-items: center; gap: 8px; padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.trans-head .tb-label { flex: 1; }
.trans-body { flex: 1; overflow: auto; padding: 12px 14px; line-height: 1.85; font-size: 15px; }
.trans-body h3 { font-size: 13px; color: var(--fg-muted); margin: 14px 0 6px; font-weight: 700; }
.trans-body p { margin: 0 0 10px; }
.trans-body .src { color: var(--fg-muted); font-size: 12.5px; }

/* ---------- states ---------- */
.dropzone {
  position: absolute; inset: 0; display: grid; place-items: center;
  background: rgba(10,12,16,.75); z-index: 30;
}
.dz-box { text-align: center; }
.dz-icon { font-size: 42px; }
.dz-text { margin: 8px 0 14px; color: var(--fg); }
.toast {
  position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%);
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--fg);
  padding: 8px 14px; border-radius: 10px; font-size: 13px; z-index: 60;
  box-shadow: 0 8px 26px rgba(0,0,0,.35);
}
.loading {
  position: fixed; inset: 0; display: grid; place-items: center; gap: 10px;
  background: rgba(10,12,16,.6); z-index: 50; color: var(--fg);
}
.loading .spinner {
  width: 34px; height: 34px; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--accent);
  animation: spin .8s linear infinite; margin: 0 auto 10px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.error-panel { position: fixed; inset: 0; display: grid; place-items: center; background: rgba(10,12,16,.85); z-index: 70; }
.err-box {
  max-width: 620px; background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px 24px; line-height: 1.7;
}
.err-box h2 { margin: 0 0 8px; font-size: 18px; color: var(--danger); }
.err-hints { color: var(--fg-muted); font-size: 13px; padding-left: 20px; }
.err-actions { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; }

/* ---------- จอมือถือ: แถบเครื่องมือเลื่อนได้ + แผงข้างซ้อนทับหน้า ---------- */
@media (max-width: 760px) {
  :root { --toolbar-h: 50px; }
  .toolbar { overflow-x: auto; gap: 6px; padding: 0 8px; scrollbar-width: none; }
  .toolbar::-webkit-scrollbar { display: none; }
  .tb-title { display: none; }
  .tb-btn { padding: 8px 11px; font-size: 13.5px; -webkit-tap-highlight-color: transparent; }
  .tb-input { width: 50px; font-size: 16px; }
  .layout { position: relative; }
  .sidebar {
    position: absolute; top: 0; bottom: 0; left: 0; z-index: 30;
    width: min(86vw, 320px); box-shadow: 0 0 30px rgba(0, 0, 0, .55);
  }
  .trans-panel {
    position: absolute; top: 0; bottom: 0; right: 0; z-index: 30;
    width: min(92vw, 460px); box-shadow: 0 0 30px rgba(0, 0, 0, .55);
  }
  .viewport { padding: 10px 0 50px; }
  .page { border-radius: 0; }
  .trans-body { font-size: 16px; line-height: 1.9; }
  .side-tab { padding: 11px 6px; font-size: 13.5px; }
  .outline-item, .search-hit { padding: 9px 8px; font-size: 13.5px; }
  .err-box { margin: 14px; padding: 18px; }
  .err-actions .tb-btn { padding: 10px 14px; }
  .reader { padding: 0 8px; }
  .rd-bar { margin: -10px -8px 12px; padding: 8px; }
  .rd-bar .tb-btn, .rd-nav .tb-btn, .rd-seg button, .rd-choice { min-height: 44px; }
  .rd-article { padding: 16px; }
  .rd-digest { padding: 12px 16px; }
  .rd-row > .tb-label { min-width: 100%; }
}