/* myNote — giao diện iPad NGANG (khung chuẩn 1180×820), kiểu Notability: sáng, bo tròn, bóng mềm. */
:root {
  --bg: #f6f7fb;
  --side: #eef1f7;
  --card: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --accent: #e8506a;
  --accent2: #ff8a4c;
  --blue: #2563eb;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .08);
  --shadow-lg: 0 10px 40px rgba(15, 23, 42, .18);
  --r: 16px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box; }
html, body { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
input, textarea, [contenteditable] { -webkit-user-select: text; user-select: text; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--ink); font-family: var(--font); overflow: hidden;
  -webkit-tap-highlight-color: transparent; -webkit-text-size-adjust: 100%; overscroll-behavior: none; }
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; padding: 0; }
input, textarea { font: inherit; color: inherit; }
.hidden { display: none !important; }
.ic { width: 20px; height: 20px; flex: none; }
.ic.sm { width: 16px; height: 16px; margin-left: auto; opacity: .5; }
#app { height: 100%; }

/* ---------- nút chung ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 18px; border-radius: 12px; font-weight: 650; font-size: 15px;
  transition: transform .12s, box-shadow .2s, background .2s; white-space: nowrap; }
.btn:active { transform: scale(.97); }
.btn.primary { background: linear-gradient(135deg, var(--accent2), var(--accent)); color: #fff; box-shadow: 0 6px 18px rgba(232, 80, 106, .35); }
.btn.ghost { background: #fff; box-shadow: inset 0 0 0 1px var(--line); color: #334155; }
.btn.danger { background: #e11d48; color: #fff; }
.icon-btn { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; color: #334155; transition: background .15s; }
.icon-btn:hover { background: rgba(15, 23, 42, .06); }
.icon-btn.round { width: 42px; height: 42px; border-radius: 50%; background: #fff; box-shadow: var(--shadow); }
.icon-btn:disabled { opacity: .3; cursor: default; }

/* ================================================================ THƯ VIỆN */
.lib { display: grid; grid-template-columns: 300px 1fr; height: 100%; }
.side { background: var(--side); padding: calc(18px + env(safe-area-inset-top)) 16px 14px; display: flex; flex-direction: column; gap: 6px; overflow: hidden;
  border-right: 1px solid #e3e7ef; }
.brand { display: flex; align-items: center; gap: 12px; padding: 4px 6px 12px; }
.brand img { width: 44px; height: 44px; border-radius: 12px; box-shadow: 0 4px 12px rgba(232, 80, 106, .3); }
.brand b { display: block; font-size: 22px; letter-spacing: -.02em; }
.brand small { display: block; font-size: 10.5px; letter-spacing: .14em; color: var(--muted); font-weight: 600; }
.search { display: flex; align-items: center; gap: 8px; height: 42px; padding: 0 12px; border-radius: 12px; background: #fff; box-shadow: inset 0 0 0 1px #dfe4ec; color: var(--muted); margin-bottom: 8px; }
.search input { border: 0; outline: 0; background: none; flex: 1; font-size: 16px; color: var(--ink); min-width: 0; }
.side-nav { display: flex; flex-direction: column; gap: 2px; }
.nav-it { display: flex; align-items: center; gap: 12px; height: 44px; padding: 0 12px; border-radius: 12px; font-size: 16.5px; font-weight: 550; color: #1e293b; text-align: left; transition: background .15s; }
.nav-it span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-it em { font-style: normal; font-size: 14px; color: var(--muted); font-weight: 500; }
.nav-it:hover { background: rgba(255, 255, 255, .6); }
.nav-it.on { background: #fff; box-shadow: var(--shadow); }
.nav-it.on .ic { color: var(--accent); }
.side-h { display: flex; align-items: center; justify-content: space-between; padding: 16px 6px 4px 12px; color: var(--muted); font-size: 14px; font-weight: 600; }
.folders { display: flex; flex-direction: column; gap: 2px; overflow-y: auto; flex: 1; margin: 0 -4px; padding: 0 4px; }
.nav-it .fic { display: grid; flex: none; }
.nav-it.folder.on .ic { color: inherit; }
.folder .fic .ic { fill: currentColor; fill-opacity: .18; }
.side-empty { color: var(--muted); font-size: 13.5px; padding: 8px 12px; }
.side-foot { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted); padding: 8px 0 0 8px; border-top: 1px solid #dfe4ec; }
.acct { flex: 1; display: flex; align-items: center; gap: 8px; min-width: 0; text-align: left; font-size: 12.5px; color: var(--muted); padding: 4px 0; }
.acct .acct-t { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.acct:not(.in) .acct-t { color: var(--blue); font-weight: 650; }
.acct.in .sync-dot { background: #22c55e; box-shadow: 0 0 0 3px rgba(34, 197, 94, .2); }
.acct img.sync-dot { width: 24px; height: 24px; box-shadow: 0 0 0 2px #22c55e; }
.side-foot .icon-btn { width: 40px; height: 40px; color: #475569; }
.side-foot .icon-btn .ic { width: 22px; height: 22px; transition: transform .3s; }
.side-foot .icon-btn:hover .ic { transform: rotate(35deg); }
/* hộp cài đặt */
.modal.set { width: min(520px, calc(100vw - 32px)); padding: 0; overflow: hidden; }
.set-h { display: flex; align-items: center; justify-content: space-between; padding: 18px 18px 12px 22px; }
.set-h h3 { margin: 0; }
.set-b { padding: 0 22px 22px; max-height: min(70vh, 640px); overflow-y: auto; }
.set-g { font-size: 12.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin: 16px 0 8px; }
.set-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 12px 14px; background: #f8fafc; border-radius: 12px; margin-bottom: 6px; }
.set-row b { display: block; font-size: 15px; }
.set-row small { display: block; color: var(--muted); font-size: 12.5px; margin-top: 2px; }
.seg2 { display: flex; background: #e9edf3; border-radius: 10px; padding: 3px; flex: none; }
.seg2 button { padding: 7px 11px; border-radius: 8px; font-size: 13px; font-weight: 650; color: #475569; }
.seg2 button.on { background: #fff; color: var(--ink); box-shadow: 0 1px 3px rgba(15,23,42,.12); }
.sw-t { width: 50px; height: 30px; border-radius: 15px; background: #cbd5e1; position: relative; flex: none; transition: background .2s; }
.sw-t::after { content: ""; position: absolute; top: 3px; left: 3px; width: 24px; height: 24px; border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.2); transition: transform .2s; }
.sw-t.on { background: #22c55e; }
.sw-t.on::after { transform: translateX(20px); }
.set-row .btn { height: 36px; padding: 0 14px; font-size: 13.5px; }
.sync-dot { width: 8px; height: 8px; border-radius: 50%; background: #f59e0b; box-shadow: 0 0 0 3px rgba(245, 158, 11, .2); }

.main { overflow-y: auto; padding: calc(26px + env(safe-area-inset-top)) 34px 40px; -webkit-overflow-scrolling: touch; }
.main-h { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 18px; }
.main-h h1 { margin: 6px 0 4px; font-size: 38px; font-weight: 800; letter-spacing: -.03em; }
.main-acts { display: flex; align-items: center; gap: 10px; padding-top: 6px; }
.icon-btn.round.big { width: 44px; height: 44px; color: #334155; }
.quick { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.quick:empty { display: none; }
.qa { background: var(--card); border-radius: var(--r); padding: 16px; text-align: left; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 4px; transition: transform .15s, box-shadow .2s; }
.qa:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.qa:active { transform: scale(.98); }
.qa-ic { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 8px; color: var(--c); background: color-mix(in srgb, var(--c) 13%, white); }
.qa b { font-size: 16px; }
.qa small { color: var(--muted); font-size: 13px; }
.sec-h { grid-column: 1 / -1; margin: 18px 0 0; font-size: 20px; font-weight: 750; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 22px; margin-top: 16px; }
.card { background: var(--card); border-radius: var(--r); box-shadow: var(--shadow); overflow: hidden; cursor: pointer; transition: transform .15s, box-shadow .2s;
  -webkit-touch-callout: none; user-select: none; -webkit-user-select: none; animation: rise .35s both; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card:active { transform: scale(.985); }
.thumb { position: relative; aspect-ratio: 4 / 3; background: #f1f5f9; overflow: hidden; border-bottom: 1px solid var(--line); }
.thumb img { width: 100%; height: 100%; object-fit: cover; object-position: top; display: block; }
.thumb .fav { position: absolute; top: 10px; left: 10px; color: #f59e0b; background: #fff; border-radius: 50%; width: 30px; height: 30px; display: grid; place-items: center; box-shadow: var(--shadow); }
.thumb .fav .ic { width: 16px; height: 16px; fill: currentColor; }
.thumb .pc { position: absolute; right: 10px; bottom: 10px; font-size: 12px; font-weight: 650; background: rgba(15, 23, 42, .7); color: #fff; padding: 3px 8px; border-radius: 99px; }
.card-b { display: flex; align-items: center; gap: 8px; padding: 12px 10px 14px 16px; }
.card-b > div { flex: 1; min-width: 0; }
.card-b b { display: block; font-size: 16.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card-b small { color: var(--muted); font-size: 14px; }
.empty { grid-column: 1 / -1; display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 70px 0; color: var(--muted); text-align: center; }
.empty .ic { width: 52px; height: 52px; color: #cbd5e1; }
.empty b { color: var(--ink); font-size: 19px; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }

/* ================================================================ MÀN VIẾT */
.ed { position: relative; height: 100%; background: #e9ecf2; -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
.ed { --edtop: calc(env(safe-area-inset-top) + 72px); }
/* v0.3.0 (thầy 25/10: "viền trên cùng bị mờ do nằm sát thanh trạng thái iOS") — dải công cụ là DẢI ĐẶC, trang giấy KHÔNG còn
   cuộn lên dưới thanh trạng thái (iOS làm mờ phần nội dung nằm dưới thanh đó). Khung viết bắt đầu ngay dưới dải. */
.ed-top { position: absolute; z-index: 5; top: 0; left: 0; right: 0; height: var(--edtop); display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: env(safe-area-inset-top) 14px 0; background: #eef1f6; border-bottom: 1px solid #dde3ec; }
.ed-top > * { pointer-events: auto; }
.ed-left, .ed-right { display: flex; align-items: center; gap: 8px; }
.ed-left { flex: 1; min-width: 0; }
.ed-right { flex: 1; justify-content: flex-end; }
.ed-title { border: 0; outline: 0; background: #fff; border-radius: 12px;
  height: 42px; padding: 0 12px; font-size: 16px; font-weight: 650; min-width: 0; width: 100%; max-width: 220px; box-shadow: var(--shadow); text-overflow: ellipsis; }
.ed-title:focus { box-shadow: 0 0 0 2px var(--blue); }
.palette { display: flex; align-items: center; gap: 4px; padding: 6px 8px; background: #fff;
  border-radius: 18px; box-shadow: 0 1px 2px rgba(15,23,42,.08), 0 4px 14px rgba(15,23,42,.08); flex: none; }
.palette .sep { width: 1px; height: 28px; background: var(--line); margin: 0 4px; }
.tools, .colors, .sizes { display: flex; align-items: center; gap: 2px; }
.tool { position: relative; width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; color: #334155; transition: background .15s, color .15s; }
.tool .ic { width: 22px; height: 22px; }
.tool:hover { background: rgba(15, 23, 42, .05); }
.tool.on { background: #eef2ff; color: var(--blue); }
.tool .tip { position: absolute; bottom: 5px; left: 50%; width: 16px; height: 4px; margin-left: -8px; border-radius: 3px; }
.sw { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; position: relative; }
.sw::before { content: ""; width: 24px; height: 24px; border-radius: 50%; background: var(--c); box-shadow: inset 0 0 0 1px rgba(15, 23, 42, .12); transition: transform .15s; }
.sw.on::after { content: ""; position: absolute; inset: 1px; border-radius: 50%; box-shadow: 0 0 0 2px var(--blue); }
.sw.custom::before { background: conic-gradient(#ef4444, #f59e0b, #eab308, #22c55e, #06b6d4, #3b82f6, #a855f7, #ef4444); }
.sw.custom.on::before { background: var(--c); }
.sw.custom .ic { position: absolute; width: 14px; height: 14px; color: #fff; filter: drop-shadow(0 0 1px rgba(0, 0, 0, .6)); }
.sw.custom input { position: absolute; inset: 0; opacity: 0; width: 100%; height: 100%; cursor: pointer; }
.size { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; }
.size i { width: var(--d); height: var(--d); border-radius: 50%; background: #475569; }
.size.on { background: #eef2ff; }
.size.on i { background: var(--blue); }
.chip { height: 32px; padding: 0 12px; border-radius: 99px; background: #f1f5f9; font-size: 13.5px; font-weight: 600; }
.hint { font-size: 13px; color: var(--muted); padding: 0 8px; max-width: 220px; line-height: 1.2; }
.colors:empty, .sizes:empty { display: none; }
.live-btn { display: flex; align-items: center; gap: 8px; height: 42px; padding: 0 14px; border-radius: 21px; background: #fff; box-shadow: var(--shadow); font-weight: 750; font-size: 14px; letter-spacing: .02em; color: #334155; white-space: nowrap; }
.live-btn.on { background: #fff1f2; color: #e11d48; box-shadow: inset 0 0 0 1.5px #fda4af, var(--shadow); }
.live-btn.on::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: #f59e0b; animation: pulse 1.2s infinite; }
.live-btn.ok::before { background: #e11d48; }
@keyframes pulse { 50% { opacity: .3; } }

.wrap { position: absolute; left: 0; right: 0; bottom: 0; top: var(--edtop); overflow: auto; touch-action: none; scrollbar-width: none; -webkit-overflow-scrolling: auto; overscroll-behavior: none; }
.wrap::-webkit-scrollbar { display: none; }
.inner { padding-top: 18px; padding-bottom: 140px; margin: 0 auto; }
.page { position: relative; margin: 0 auto; background: #fff; box-shadow: 0 1px 3px rgba(15, 23, 42, .12), 0 6px 20px rgba(15, 23, 42, .07); }
.page canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.page canvas.overlay { pointer-events: none; z-index: 2; }
.page canvas.overlay.hl { mix-blend-mode: multiply; }
.wrap[data-tool="pen"], .wrap[data-tool="hl"] { cursor: crosshair; }
.wrap[data-tool="text"] { cursor: text; }
.add-page { display: flex; align-items: center; gap: 8px; margin: 6px auto 0; height: 46px; padding: 0 22px; border-radius: 23px; background: #fff; box-shadow: var(--shadow); font-weight: 650; color: #475569; }
.laser-layer { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 4; }
/* v0.3.0 — lớp nét đang viết: CỠ KHUNG VIẾT (không phải cỡ trang), nằm ngay trên khung cuộn */
.live-layer { position: absolute; left: 0; right: 0; bottom: 0; top: var(--edtop); width: 100%; height: calc(100% - var(--edtop)); pointer-events: none; z-index: 3; }
.live-layer.hl { mix-blend-mode: multiply; }
.pager { position: absolute; z-index: 5; right: 16px; bottom: calc(18px + env(safe-area-inset-bottom)); display: flex; flex-direction: column; align-items: center; gap: 2px;
  background: #fff; border-radius: 16px; padding: 6px 4px; box-shadow: var(--shadow); }
.pager button { width: 36px; height: 34px; display: grid; place-items: center; color: #475569; }
.pg-n { font-size: 12.5px; font-weight: 650; color: #475569; padding: 2px 0; text-align: center; width: 44px; }
.zoom-badge { position: absolute; z-index: 6; left: 50%; top: 50%; transform: translate(-50%, -50%) scale(.9); background: rgba(15, 23, 42, .78); color: #fff; font-weight: 750; font-size: 18px;
  padding: 10px 18px; border-radius: 14px; opacity: 0; transition: opacity .2s, transform .2s; pointer-events: none; }
.zoom-badge.in { opacity: 1; transform: translate(-50%, -50%) scale(1); }

.sel { position: absolute; z-index: 3; border: 1.5px dashed var(--blue); border-radius: 6px; background: rgba(37, 99, 235, .05); cursor: move; }
.sel-menu { position: absolute; left: 50%; bottom: calc(100% + 10px); transform: translateX(-50%); display: flex; gap: 2px; background: #0f172a; border-radius: 12px; padding: 4px; box-shadow: var(--shadow-lg); white-space: nowrap; }
.sel-menu button { display: flex; align-items: center; gap: 6px; color: #fff; font-size: 13.5px; font-weight: 600; padding: 7px 11px; border-radius: 9px; }
.sel-menu button:hover { background: rgba(255, 255, 255, .12); }
.sel-menu .ic { width: 16px; height: 16px; }
.text-edit { position: absolute; z-index: 3; border: 0; outline: 1.5px dashed rgba(37, 99, 235, .6); outline-offset: 4px; background: rgba(255, 255, 255, .55); resize: none; padding: 0; margin: 0;
  line-height: 1.3; overflow: hidden; -webkit-user-select: text; user-select: text; min-height: 1.3em; }

/* ================================================================ MENU / HỘP THOẠI */
.menu-back { position: fixed; inset: 0; z-index: 50; }
.menu { position: fixed; min-width: 220px; background: rgba(255, 255, 255, .97); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-radius: 14px; padding: 6px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(15, 23, 42, .06); opacity: 0; transform: scale(.96); transform-origin: top left; transition: opacity .14s, transform .14s; }
.menu.in { opacity: 1; transform: none; }
.menu-it { display: flex; align-items: center; gap: 12px; width: 100%; padding: 10px 12px; border-radius: 9px; font-size: 15px; text-align: left; }
.menu-it:hover { background: #f1f5f9; }
.menu-it.on { color: var(--blue); font-weight: 650; }
.menu-it.danger { color: #e11d48; }
.menu-it .ic { width: 18px; height: 18px; }
.menu-it .dot { width: 14px; height: 14px; border-radius: 50%; flex: none; }
.menu-sep { height: 1px; background: var(--line); margin: 5px 8px; }
.modal-back { position: fixed; inset: 0; z-index: 60; background: rgba(15, 23, 42, .32); display: grid; place-items: center; opacity: 0; transition: opacity .18s; }
.modal-back.in { opacity: 1; }
.modal { width: min(420px, calc(100vw - 32px)); background: #fff; border-radius: 20px; padding: 22px; box-shadow: var(--shadow-lg); transform: translateY(10px); transition: transform .2s; }
.modal-back.in .modal { transform: none; }
.modal h3 { margin: 0 0 14px; font-size: 20px; }
.modal p { color: #475569; margin: 0 0 6px; line-height: 1.5; }
.field { width: 100%; height: 46px; border-radius: 12px; border: 0; box-shadow: inset 0 0 0 1.5px var(--line); padding: 0 14px; font-size: 17px; outline: 0; }
.field:focus { box-shadow: inset 0 0 0 2px var(--blue); }
.modal-acts { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
.toast { position: fixed; z-index: 70; left: 50%; bottom: 28px; transform: translate(-50%, 20px); background: rgba(15, 23, 42, .9); color: #fff; padding: 12px 20px; border-radius: 14px;
  font-weight: 600; font-size: 15px; opacity: 0; transition: opacity .2s, transform .2s; pointer-events: none; max-width: 90vw; }
.toast.in { opacity: 1; transform: translate(-50%, 0); }

/* iPad dọc / màn hẹp: thu thanh bên (thầy dùng iPad ngang — đây chỉ là đường lùi) */
@media (max-width: 900px) {
  .lib { grid-template-columns: 230px 1fr; }
  .quick { grid-template-columns: repeat(2, 1fr); }
  .palette .sizes, .palette .sep:nth-of-type(3) { display: none; }
  .ed-title { max-width: 120px; }
  .live-btn span { display: none; }
}
@media (max-width: 1100px) { .live-btn.on span { max-width: 80px; overflow: hidden; text-overflow: ellipsis; } }