/* ==========================================================
   ห้องสมุดฟลิปบุ๊ก — สไตล์หลัก
   ========================================================== */

/* ---------- ฟอนต์ (เก็บในเว็บเอง ไม่ต้องพึ่ง Google Fonts) — Prompt ตามเว็บ talmw.or.th ---------- */
@font-face { font-family: "Prompt"; font-weight: 400; font-display: swap; src: url("../fonts/prompt-latin-400-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Prompt"; font-weight: 400; font-display: swap; src: url("../fonts/prompt-thai-400-normal.woff2") format("woff2"); unicode-range: U+02D7, U+0303, U+0331, U+0E01-0E5B, U+200C-200D, U+25CC; }
@font-face { font-family: "Prompt"; font-weight: 500; font-display: swap; src: url("../fonts/prompt-latin-500-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Prompt"; font-weight: 500; font-display: swap; src: url("../fonts/prompt-thai-500-normal.woff2") format("woff2"); unicode-range: U+02D7, U+0303, U+0331, U+0E01-0E5B, U+200C-200D, U+25CC; }
@font-face { font-family: "Prompt"; font-weight: 600; font-display: swap; src: url("../fonts/prompt-latin-600-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Prompt"; font-weight: 600; font-display: swap; src: url("../fonts/prompt-thai-600-normal.woff2") format("woff2"); unicode-range: U+02D7, U+0303, U+0331, U+0E01-0E5B, U+200C-200D, U+25CC; }
@font-face { font-family: "Prompt"; font-weight: 700; font-display: swap; src: url("../fonts/prompt-latin-700-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Prompt"; font-weight: 700; font-display: swap; src: url("../fonts/prompt-thai-700-normal.woff2") format("woff2"); unicode-range: U+02D7, U+0303, U+0331, U+0E01-0E5B, U+200C-200D, U+25CC; }

/* ---------- โทเคนสี / ตัวอักษร ---------- */
:root {
  --ink:      #122a46;   /* น้ำเงินกรมท่าเข้ม: หัวข้อ, ตัวอักษรเข้ม */
  --leaf:     #1c6fd6;   /* ฟ้าสด: ปุ่มหลัก, ลิงก์, ไอคอนเน้น */
  --leaf-dk:  #14509f;   /* ฟ้าเข้ม: hover/active */
  --tint:     #e4f1fe;   /* ฟ้าอ่อนมาก: พื้นป้าย, ไอคอนกล่องอ่อน */
  --marigold: #f0a81c;   /* สีเน้นเฉพาะหน้าอ่านหนังสือ (ธีมมืด): โฟกัส, ตัวเลื่อนหน้า */
  --mist:     #eff5fc;   /* พื้นหลังหน้าเว็บ ฟ้าอ่อนเกือบขาว */
  --paper:    #ffffff;
  --text:     #33475b;
  --muted:    #64778d;
  --line:     #e1e8f1;

  --font-body:    "Prompt", "IBM Plex Sans Thai", "Noto Sans Thai", "Sarabun", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: var(--font-body);

  --bs-body-font-family: var(--font-body);
  --bs-body-color: var(--text);
  --bs-body-bg: var(--mist);
  --bs-primary: var(--leaf);
  --bs-primary-rgb: 28, 111, 214;
  --bs-link-color: var(--leaf);
  --bs-link-color-rgb: 28, 111, 214;
  --bs-link-hover-color: var(--leaf-dk);
  --bs-border-color: var(--line);
  --bs-border-radius: .75rem;
}

body { font-family: var(--font-body); line-height: 1.65; -webkit-font-smoothing: antialiased; }
h1, h2, h3, .display-font { font-family: var(--font-display); font-weight: 700; line-height: 1.35; color: var(--ink); }

.btn-primary {
  --bs-btn-bg: var(--leaf); --bs-btn-border-color: var(--leaf);
  --bs-btn-hover-bg: var(--leaf-dk); --bs-btn-hover-border-color: var(--leaf-dk);
  --bs-btn-active-bg: var(--leaf-dk); --bs-btn-active-border-color: var(--leaf-dk);
  --bs-btn-disabled-bg: var(--leaf); --bs-btn-disabled-border-color: var(--leaf);
  --bs-btn-focus-shadow-rgb: 28, 111, 214;
}
.btn-outline-primary {
  --bs-btn-color: var(--leaf); --bs-btn-border-color: var(--leaf);
  --bs-btn-hover-bg: var(--leaf); --bs-btn-hover-border-color: var(--leaf);
  --bs-btn-active-bg: var(--leaf-dk); --bs-btn-active-border-color: var(--leaf-dk);
}
.form-control:focus, .form-select:focus, .form-check-input:focus {
  border-color: var(--leaf);
  box-shadow: 0 0 0 .25rem rgba(28, 111, 214, .22);
}
.form-check-input:checked { background-color: var(--leaf); border-color: var(--leaf); }
:focus-visible { outline: 3px solid var(--marigold); outline-offset: 2px; }

/* ---------- แถบหัวเว็บ (ใช้ร่วมกัน) ---------- */
.site-nav { background: var(--paper); border-bottom: 1px solid var(--line); }
.site-nav .brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--ink); text-decoration: none; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; }
.site-nav .brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px; background: linear-gradient(135deg, var(--leaf), var(--leaf-dk)); color: #fff; font-size: 1.1rem; }
.site-nav .nav-link-lite { color: var(--ink); text-decoration: none; font-size: .92rem; font-weight: 500; padding: .5rem 1.1rem; border-radius: 999px; border: 1px solid var(--line); transition: border-color .15s, background .15s; }
.site-nav .nav-link-lite:hover { border-color: var(--leaf); background: var(--tint); color: var(--leaf-dk); }

/* ==========================================================
   หน้าห้องสมุด (public)
   ========================================================== */
.hero {
  background: radial-gradient(1100px 480px at 88% -12%, var(--tint), transparent 60%), var(--mist);
  color: var(--text); padding: 3.25rem 0 5.5rem; position: relative; overflow: hidden;
}
.hero > .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 2.5rem; align-items: center; }
@media (max-width: 991.98px) { .hero-grid { grid-template-columns: 1fr; } }

.hero-badge {
  display: inline-block; background: var(--tint); color: var(--leaf-dk); font-size: .85rem; font-weight: 600;
  padding: .45rem 1rem; border-radius: 999px; margin-bottom: 1.1rem;
}
.hero-back { display: inline-flex; align-items: center; color: var(--muted); text-decoration: none; font-size: .9rem; font-weight: 500; margin-bottom: 1rem; }
.hero-back:hover { color: var(--leaf); }
.hero h1 { font-size: clamp(2rem, 4vw, 2.9rem); margin: 0 0 .5rem; letter-spacing: -.01em; }
.hero h1 .accent { color: var(--leaf); display: block; }
.hero p { color: var(--muted); font-size: 1.05rem; max-width: 32rem; margin-bottom: 1.75rem; }
.search-row { display: flex; flex-wrap: wrap; gap: .75rem; align-items: stretch; }
.search-box { position: relative; flex: 1 1 18rem; max-width: 28rem; }
.search-box .bi { position: absolute; left: 1.15rem; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; }
.search-box input { width: 100%; padding: .8rem 1rem .8rem 2.9rem; border: 1px solid var(--line); border-radius: 999px; font-size: 1rem; box-shadow: 0 10px 24px -14px rgba(18,42,70,.18); }
.category-pick { flex: 0 1 12rem; border: 1px solid var(--line); border-radius: 999px; padding: .8rem 2rem .8rem 1.1rem; font-size: .92rem; box-shadow: 0 10px 24px -14px rgba(18,42,70,.18); }

.hero-features { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.feature-card { background: var(--paper); border: 1px solid var(--line); border-radius: 1rem; padding: 1.15rem 1.1rem; box-shadow: 0 14px 30px -22px rgba(18,42,70,.25); }
.feature-card:nth-child(2), .feature-card:nth-child(3) { margin-top: 1.75rem; }
.feature-card .icon { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; background: var(--tint); color: var(--leaf); font-size: 1.15rem; margin-bottom: .75rem; }
.feature-card h3 { font-size: .95rem; margin: 0 0 .15rem; }
.feature-card p { font-size: .82rem; color: var(--muted); margin: 0; max-width: none; }

.shelf { margin-top: -2.5rem; position: relative; z-index: 2; padding-bottom: 4rem; display: flow-root; }

.category-section + .category-section { margin-top: 3rem; }
.category-section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.category-section-head h2 { font-size: 1.35rem; margin: 0; display: flex; align-items: baseline; gap: .6rem; }
.category-section-head .count { font-size: .85rem; font-weight: 500; color: var(--muted); font-family: var(--font-body); }

.book { display: block; color: inherit; text-decoration: none; }
.book:hover { color: inherit; }
.book-cover {
  position: relative; aspect-ratio: 3 / 4; background: #fff; overflow: hidden;
  border-radius: 3px 7px 7px 3px;
  box-shadow:
    1px 0 0 #e4eaf3, 3px 0 0 #fff, 4px 0 0 #d7e0ec, 6px 0 0 #fff, 7px 0 0 #cad5e4,
    0 22px 26px -18px rgba(18, 42, 70, .35);
  transform-origin: 0 50%;
  transition: transform .28s ease;
}
.book-cover::after { /* รอยพับสันปก */
  content: ""; position: absolute; inset: 0 auto 0 0; width: 16px; z-index: 2; pointer-events: none;
  background: linear-gradient(90deg, rgba(0,0,0,.30), rgba(255,255,255,.22) 45%, rgba(0,0,0,0) 100%);
}
.book-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.book:hover .book-cover, .book:focus-visible .book-cover { transform: perspective(900px) rotateY(-16deg); }
@media (prefers-reduced-motion: reduce) { .book-cover { transition: none; } .book:hover .book-cover { transform: none; } }

.cover-fallback { position: absolute; inset: 0; display: flex; align-items: flex-end; padding: 1.4rem 1rem 1.1rem 1.6rem; color: #fff;
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; line-height: 1.4; }
.tone-0 { background: linear-gradient(160deg, #1c6fd6, #122a46); }
.tone-1 { background: linear-gradient(160deg, #37508f, #1a2a55); }
.tone-2 { background: linear-gradient(160deg, #8a4a2f, #4a2415); }
.tone-3 { background: linear-gradient(160deg, #6b3f7c, #33193f); }
.tone-4 { background: linear-gradient(160deg, #b07a10, #5e3e05); }

.book-info { padding: 1.05rem .25rem 0 .5rem; }
.book-title { font-weight: 600; font-size: 1rem; line-height: 1.45; margin: 0 0 .25rem;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.book-meta { display: flex; justify-content: space-between; gap: .5rem; color: var(--muted); font-size: .85rem; }

.empty-state { text-align: center; padding: 4rem 1rem; background: var(--paper); border-radius: 1rem; border: 1px dashed var(--line); }
.empty-state .bi { font-size: 2.6rem; color: var(--leaf); }

.site-foot { color: var(--muted); font-size: .88rem; padding: 1.5rem 0 2.5rem; border-top: 1px solid var(--line); }
.site-foot a { color: var(--muted); }

/* ==========================================================
   หลังบ้าน (admin)
   ========================================================== */
.admin-wrap { padding: 2rem 0 4rem; }
.panel { --bs-body-bg: #fff; background: var(--paper); border: 1px solid var(--line); border-radius: 1rem; }
.form-control, .form-select { background-color: #fff; }
.panel-head { padding: 1rem 1.25rem; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.panel-head h2 { font-size: 1.15rem; margin: 0; }
.panel-body { padding: 1.25rem; }

.stat { display: flex; align-items: center; gap: .9rem; padding: 1rem 1.25rem; }
.stat .bi { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 10px; background: var(--tint); color: var(--leaf); font-size: 1.3rem; }
.stat b { display: block; font-size: 1.5rem; line-height: 1.2; font-family: var(--font-display); color: var(--ink); }
.stat span { color: var(--muted); font-size: .88rem; }

.dropzone { border: 2px dashed #a9c3e6; border-radius: 1rem; background: #f5f9fe; padding: 2rem 1rem; text-align: center; cursor: pointer; transition: background .15s, border-color .15s; }
.dropzone:hover, .dropzone.is-over { background: var(--tint); border-color: var(--leaf); }
.dropzone .bi { font-size: 2.2rem; color: var(--leaf); }
.dropzone .picked { display: flex; align-items: center; gap: 1rem; text-align: left; }
.cover-preview { width: 72px; height: 96px; border-radius: 3px 6px 6px 3px; background: #e9eef5; object-fit: cover; box-shadow: 1px 0 0 #e4eaf3, 3px 0 0 #fff, 4px 0 0 #d7e0ec; flex: none; }

.min-w-0 { min-width: 0; }
.col-lg-6:has(#pdfFile:focus-visible) .dropzone { outline: 3px solid var(--marigold); outline-offset: 2px; }

.table > :not(caption) > * > * { vertical-align: middle; }
.thumb { width: 46px; height: 62px; object-fit: cover; border-radius: 2px 4px 4px 2px; background: #e9eef5; box-shadow: 1px 0 0 #d7e0ec; display: block; }
.thumb-empty { width: 46px; height: 62px; border-radius: 2px 4px 4px 2px; display: grid; place-items: center; color: rgba(255,255,255,.85); font-size: 1.2rem; }
.row-title { font-weight: 600; color: var(--ink); }
.row-desc { color: var(--muted); font-size: .85rem; max-width: 28rem; }
.cat-badge { background: var(--tint); color: var(--leaf-dk); font-weight: 500; font-size: .8rem; padding: .35em .7em; }

.login-card { max-width: 25rem; margin: 5rem auto; }

/* ==========================================================
   หน้าอ่าน (reader)
   ========================================================== */
.reader-body { height: 100vh; height: 100dvh; margin: 0; display: flex; flex-direction: column; overflow: hidden; color: var(--ink);
  background: linear-gradient(173deg, #ffffff 0%, #e0f2fe 30%, #eafaf1 55%, #f8fafc 80%, #f8fafc 100%); }

.reader-bar { flex: none; display: flex; align-items: center; gap: .75rem; padding: .6rem .9rem; padding-top: calc(.6rem + env(safe-area-inset-top, 0px)); background: rgba(255,255,255,.72); border-bottom: 1px solid var(--line); backdrop-filter: blur(8px); z-index: 5; }
.reader-title { flex: 1; min-width: 0; font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--ink); }
.rbtn { width: 40px; height: 40px; flex: none; display: inline-grid; place-items: center; border: 0; border-radius: 50%; background: rgba(18,42,70,.06); color: var(--ink); font-size: 1.1rem; text-decoration: none; transition: background .15s; }
.rbtn:hover:not(:disabled) { background: rgba(18,42,70,.12); color: var(--ink); }
.rbtn:disabled { opacity: .35; cursor: default; }
.rbtn.wide { width: auto; min-width: 58px; padding: 0 .8rem; border-radius: 999px; font-size: .9rem; font-weight: 500; font-variant-numeric: tabular-nums; }
.rbtn.off { opacity: .6; }
.zoom-ctl { display: flex; align-items: center; gap: .35rem; }
@media (max-width: 575.98px) { .reader-bar { gap: .4rem; padding-left: .5rem; padding-right: .5rem; } .zoom-ctl { gap: .25rem; } }

.stage { flex: 1; min-height: 0; position: relative; touch-action: none; }
.stage.zoomed { overflow: hidden; }
#book { position: absolute; top: 26px; bottom: 26px; left: 18px; right: 18px; visibility: hidden; }
#book { transform-origin: 50% 50%; }
#book.ready { visibility: visible; }

/* ชั้นโปร่งใสรับการลากเลื่อนดูตอนซูม (ซ่อนไว้เมื่ออยู่ที่ 100%) */
.zoom-layer { position: absolute; inset: 0; z-index: 3; display: none; cursor: grab; touch-action: none; }
.zoom-layer.on { display: block; }
.zoom-layer.dragging { cursor: grabbing; }
@media (max-width: 575.98px) { #book { left: 4px; right: 4px; top: 6px; bottom: 6px; } }

.page { background: #fff; overflow: hidden; }
.page .page-img { width: 100%; height: 100%; display: block; object-fit: contain; user-select: none; -webkit-user-drag: none; }
.page .page-img:not([src]) { visibility: hidden; }
.page::before { /* วงหมุนระหว่างรอเรนเดอร์หน้านั้น */
  content: ""; position: absolute; left: 50%; top: 50%; width: 26px; height: 26px; margin: -13px 0 0 -13px;
  border: 3px solid #d7e1de; border-top-color: var(--leaf); border-radius: 50%; animation: spin .8s linear infinite; }
.page.is-loaded::before { display: none; }
.page-shade { position: absolute; inset: 0; pointer-events: none; }
.page.--left  .page-shade { background: linear-gradient(270deg, rgba(0,0,0,.13) 0, rgba(0,0,0,.04) 6%, rgba(0,0,0,0) 14%); }
.page.--right .page-shade { background: linear-gradient(90deg,  rgba(0,0,0,.13) 0, rgba(0,0,0,.04) 6%, rgba(0,0,0,0) 14%); }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .page::before { animation-duration: 2s; } }

.reader-foot { flex: none; display: flex; align-items: center; gap: 1rem; padding: .6rem 1.1rem; padding-bottom: calc(.6rem + env(safe-area-inset-bottom, 0px)); background: rgba(255,255,255,.72); border-top: 1px solid var(--line); backdrop-filter: blur(8px); z-index: 5; }
.page-label { min-width: 6.2rem; text-align: center; font-variant-numeric: tabular-nums; font-weight: 500; color: var(--ink); }
.reader-foot input[type=range] { flex: 1; -webkit-appearance: none; appearance: none; height: 6px; border-radius: 999px; background: linear-gradient(90deg, var(--leaf) var(--p, 0%), rgba(18,42,70,.14) var(--p, 0%)); outline-offset: 6px; }
.reader-foot input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%; background: #fff; border: 3px solid var(--leaf); box-shadow: 0 1px 4px rgba(18,42,70,.35); cursor: pointer; }
.reader-foot input[type=range]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 3px solid var(--leaf); box-shadow: 0 1px 4px rgba(18,42,70,.35); cursor: pointer; }

.loader { position: absolute; inset: 0; z-index: 6; display: grid; place-items: center; text-align: center; background: transparent; transition: opacity .3s; }
.loader.done { opacity: 0; pointer-events: none; }
.loader .bar { width: min(280px, 70vw); height: 6px; border-radius: 999px; background: rgba(18,42,70,.12); overflow: hidden; margin: .9rem auto 0; }
.loader .bar > i { display: block; height: 100%; width: 0; background: var(--leaf); transition: width .2s; }
.loader .bi { font-size: 2.2rem; color: var(--leaf); }
.loader.error .bi { color: #d64545; }

.toast-lite { position: fixed; left: 50%; bottom: 76px; transform: translateX(-50%); background: var(--ink); color: #fff; padding: .5rem 1rem; border-radius: 999px; font-size: .92rem; font-weight: 500; z-index: 20; box-shadow: 0 8px 24px rgba(18,42,70,.35); opacity: 0; pointer-events: none; transition: opacity .2s; }
.toast-lite.show { opacity: 1; }