:root {
  --bg: #f4efe6; --bg2: #fbf8f2; --ink: #1f1a15; --ink2: #5d554c; --line: #e2d9cb;
  --accent: #b8471c; --accent-ink: #fff; --ok: #2f7d4f; --err: #b3261e;
  --shadow: 0 1px 2px rgba(40,30,20,.06), 0 8px 24px rgba(40,30,20,.08);
  --r: 16px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #141216; --bg2: #1d1a20; --ink: #efe9df; --ink2: #a79e92; --line: #2e2a33; --accent: #f28b5c; --accent-ink: #1a0d06; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35); }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.55 Inter, system-ui, -apple-system, "Segoe UI", sans-serif; }
h1, h2, h3 { font-family: Fraunces, Georgia, serif; font-weight: 700; letter-spacing: -.01em; margin: 0; }
a { color: inherit; text-decoration: none; }
code { font: 13px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; background: color-mix(in srgb, var(--ink) 8%, transparent); padding: 2px 6px; border-radius: 6px; word-break: break-all; }
.muted { color: var(--ink2); } .small { font-size: .85rem; }

.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px max(16px, env(safe-area-inset-left)); background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 8px; font-family: Fraunces, serif; font-size: 1.15rem; }
.brand b { color: var(--accent); }
.logo { font-size: 1.3rem; }
.top-actions { display: flex; align-items: center; gap: 10px; }
.count { color: var(--ink2); font-size: .85rem; }

main { max-width: 900px; margin: 0 auto; padding: 8px 16px 80px; }
.hero { padding: 28px 0 18px; }
.hero h1 { font-size: clamp(1.7rem, 4.5vw, 2.5rem); line-height: 1.12; }
.hero h1 em { font-style: italic; color: var(--accent); }
.lead { color: var(--ink2); max-width: 60ch; margin: 12px 0 0; }

.btn { border: 1px solid var(--line); background: var(--bg2); color: var(--ink); border-radius: 999px; padding: 8px 14px; font: inherit; font-weight: 500; cursor: pointer; transition: transform .08s, border-color .15s, background .15s; }
.btn:hover { border-color: var(--accent); } .btn:active { transform: scale(.97); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn.ghost { background: transparent; }
.btn.tiny { padding: 3px 9px; font-size: .78rem; }
.btn.danger { color: var(--err); }
.btn[disabled] { opacity: .5; cursor: default; }

.intake { margin-top: 8px; }
.tabs { display: inline-flex; gap: 4px; padding: 4px; background: color-mix(in srgb, var(--ink) 6%, transparent); border-radius: 999px; margin-bottom: 12px; }
.tab { border: 0; background: transparent; color: var(--ink2); font: inherit; font-weight: 500; padding: 6px 14px; border-radius: 999px; cursor: pointer; }
.tab.active { background: var(--bg2); color: var(--ink); box-shadow: var(--shadow); }
.panel { background: var(--bg2); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); }
.drop { display: block; padding: 34px 20px; text-align: center; cursor: pointer; border: 2px dashed var(--line); transition: border-color .15s, background .15s, transform .15s; }
.drop:hover, .drop.over { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 6%, var(--bg2)); }
.drop.over { transform: scale(1.01); }
.drop input { display: none; }
.drop-icon { font-size: 2rem; line-height: 1; color: var(--accent); }
.drop-title { font-weight: 600; margin-top: 10px; }
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin-top: 12px; }
.chips span { font-size: .78rem; padding: 3px 9px; border-radius: 999px; background: color-mix(in srgb, var(--ink) 7%, transparent); color: var(--ink2); }
.text-panel { padding: 16px; display: grid; gap: 10px; }
.input { width: 100%; font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; }
.input:focus { outline: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); border-color: var(--accent); }
textarea.input { resize: vertical; font-family: ui-monospace, Consolas, monospace; font-size: .9rem; }
.row-end { display: flex; justify-content: flex-end; }

.queue { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 8px; }
.queue li { display: grid; grid-template-columns: 22px 1fr auto; align-items: center; gap: 10px; padding: 10px 12px; background: var(--bg2); border: 1px solid var(--line); border-radius: 12px; font-size: .92rem; }
.queue .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.queue .st { color: var(--ink2); font-size: .82rem; }
.queue li.ok .st { color: var(--ok); } .queue li.err .st { color: var(--err); }
.spin { width: 16px; height: 16px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.shelf { margin-top: 36px; }
.shelf-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.shelf-head h2 { font-size: 1.35rem; }
.search { max-width: 240px; padding: 8px 12px; border-radius: 999px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }
.book { background: var(--bg2); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column; animation: pop .25s ease-out; }
@keyframes pop { from { opacity: 0; transform: translateY(6px); } }
.cover { aspect-ratio: 2 / 3; display: flex; align-items: flex-end; padding: 12px; color: #fff; font-family: Fraunces, serif; font-weight: 700; font-size: 1.05rem; line-height: 1.15; text-shadow: 0 1px 2px rgba(0,0,0,.35); position: relative; }
.cover::after { content: ""; position: absolute; left: 10px; top: 0; bottom: 0; width: 2px; background: rgba(255,255,255,.25); }
.cover span { display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.meta { padding: 10px 12px 8px; font-size: .82rem; color: var(--ink2); line-height: 1.35; }
.meta b { display: block; color: var(--ink); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.acts { display: flex; gap: 6px; padding: 0 10px 10px; margin-top: auto; }
.acts .btn { flex: 1; padding: 6px 8px; font-size: .82rem; text-align: center; }
.empty { text-align: center; padding: 44px 16px; color: var(--ink2); border: 1px dashed var(--line); border-radius: var(--r); }
.empty-art { font-size: 2.4rem; }

.sheet-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.35); z-index: 20; }
.sheet { position: fixed; z-index: 21; left: 0; right: 0; bottom: 0; background: var(--bg2); border-radius: 20px 20px 0 0; padding: 18px 18px calc(18px + env(safe-area-inset-bottom)); box-shadow: 0 -12px 40px rgba(0,0,0,.25); max-height: 85vh; overflow: auto; animation: up .22s ease-out; }
@keyframes up { from { transform: translateY(24px); opacity: 0; } }
@media (min-width: 700px) { .sheet { left: auto; top: 0; bottom: 0; width: 420px; border-radius: 20px 0 0 20px; animation: none; } }
.sheet-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.steps { padding-left: 20px; display: grid; gap: 12px; }
.kv { display: grid; grid-template-columns: 72px 1fr auto; align-items: center; gap: 8px; margin: 8px 0; font-size: .9rem; }
.kv span { color: var(--ink2); }

.toasts { position: fixed; left: 50%; bottom: calc(18px + env(safe-area-inset-bottom)); transform: translateX(-50%); display: grid; gap: 8px; z-index: 30; pointer-events: none; }
.toast { background: var(--ink); color: var(--bg); padding: 10px 14px; border-radius: 12px; font-size: .9rem; box-shadow: var(--shadow); animation: up .2s ease-out; }
.toast.err { background: var(--err); color: #fff; }

/* ── Đăng nhập / đăng ký ── */
.hero-sm { padding: 20px 0 12px; }
.hero-sm h1 { font-size: clamp(1.4rem, 3.6vw, 2rem); }
.points { margin: 16px 0 0; padding-left: 20px; color: var(--ink2); display: grid; gap: 6px; max-width: 60ch; }
.auth-card { max-width: 420px; padding: 18px; margin: 18px 0 40px; }
.auth-card .tabs { margin-bottom: 14px; }
.auth-form { display: grid; gap: 12px; }
.field { display: grid; gap: 6px; font-size: .9rem; font-weight: 500; }
.field span { color: var(--ink2); }
.hint { margin: 0; line-height: 1.45; }
.form-error { margin: 0; padding: 10px 12px; border-radius: 10px; background: color-mix(in srgb, var(--err) 12%, transparent); color: var(--err); font-size: .9rem; }
.btn.wide { width: 100%; padding: 11px 14px; }
.usage { margin: -6px 0 14px; }
.sheet h4 { margin: 22px 0 8px; font-size: .95rem; }
.sheet .auth-form { gap: 8px; }
.danger-title { color: var(--err); }
code.key.fresh { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--ink); font-weight: 600; letter-spacing: .03em; }
/* Header không xuống dòng trên điện thoại */
.brand, .top .btn { white-space: nowrap; }
.brand { flex-shrink: 0; }
.top-actions { min-width: 0; }
#accountBtn { max-width: 40vw; overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 480px) {
  .top-actions { gap: 6px; }
  .top-actions .btn { padding: 7px 10px; }
  .count { display: none; }
  /* Đã đăng nhập thì chỉ giữ logo cho đủ chỗ hai nút */
  .top:has(#topActions:not([hidden])) .brand-text { display: none; }
  #accountBtn { max-width: 34vw; }
}
.drop:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Chọn cách chuyển PDF */
.pdf-mode { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; margin-top: 10px; font-size: .88rem; }
.pdf-mode label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }
.pdf-mode input { accent-color: var(--accent); }

/* Đăng nhập bằng Google — nút trắng viền xám theo hướng dẫn thương hiệu của Google */
.btn.google { display: inline-flex; align-items: center; justify-content: center; gap: 10px; background: #fff; color: #1f1f1f; border-color: #747775; font-family: Roboto, Inter, system-ui, sans-serif; font-weight: 500; }
.btn.google:hover { border-color: #1f1f1f; background: #f8f8f8; }
.g-logo { width: 18px; height: 18px; flex: none; }
.or { display: flex; align-items: center; gap: 10px; margin: 14px 0; color: var(--ink2); font-size: .82rem; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.pick-title { font-family: Fraunces, Georgia, serif; font-size: 1.3rem; margin: 0 0 6px; }
#googleSection .btn { margin-top: 4px; }

/* Mã cho ứng dụng */
.token-list { list-style: none; margin: 8px 0; padding: 0; display: grid; gap: 6px; }
.token-list li { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; font-size: .88rem; }
.token-list li > div { flex: 1; min-width: 0; }
.token-list b { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.token-new { margin: 8px 0; }

/* Dán link */
.clip-row { display: flex; gap: 8px; }
.clip-row .input { flex: 1; min-width: 0; }
.share-help { margin-top: 6px; }
.share-help summary { cursor: pointer; }
.share-help p { margin: 6px 0; }

/* Nhắc cần firmware CrossPoint */
.need-fw { margin: 0 0 10px; padding: 10px 12px; border-radius: 12px; background: color-mix(in srgb, var(--accent) 10%, transparent); line-height: 1.5; }
.need-fw a, .points a { color: var(--accent); }

/* Nút chuyển ngôn ngữ */
.lang-btn { margin-left: auto; margin-right: 8px; padding: 6px 10px; font-size: .8rem; letter-spacing: .04em; }

/* Chân trang: tự dựng bản riêng */
.foot { max-width: 1100px; margin: 40px auto 0; padding: 20px max(16px, env(safe-area-inset-left)) calc(28px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); text-align: center; display: grid; gap: 10px; justify-items: center; }
.foot p { margin: 0; max-width: 60ch; }
.foot a { color: var(--accent); }
.foot-actions .btn, .foot .deploy-btn { color: inherit; }
.foot .deploy-btn { color: #fff; }
.foot-self { display: grid; gap: 10px; justify-items: center; }
.foot-actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.foot-actions .btn { text-decoration: none; }
.deploy-btn { background: #f38020; color: #fff; border-color: transparent; font-weight: 600; }
.deploy-btn:hover { background: #e06d0f; border-color: transparent; }
.hint a { color: var(--accent); font-weight: 600; }

/* Nút "Tự dựng" trên thanh đầu trang */
.self-btn { margin-left: 10px; padding: 6px 12px; font-size: .85rem; display: inline-flex; align-items: center; gap: 6px; color: #f38020; border-color: color-mix(in srgb, #f38020 45%, var(--line)); }
.self-btn:hover { border-color: #f38020; }
@media (max-width: 560px) { .self-label { display: none; } .self-btn { margin-left: 6px; padding: 6px 9px; } }
#selfSheet .steps code { font-size: .8em; }
#selfSheet .foot-actions { margin: 14px 0 10px; justify-content: flex-start; }

/* Thanh "bản dùng thử" (chỉ bản chung) */
.demo-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 6px 12px; padding: 8px max(16px, env(safe-area-inset-left)); background: color-mix(in srgb, #f38020 12%, var(--bg)); border-bottom: 1px solid color-mix(in srgb, #f38020 30%, var(--line)); font-size: .85rem; text-align: center; }
.demo-link { border: 0; background: none; color: #f38020; font: inherit; font-weight: 600; cursor: pointer; padding: 2px 4px; }
.demo-link:hover { text-decoration: underline; }