/* ==========================================================================
   taomaqrcode.com — design system + T1 (trang chủ)
   Nguồn: "taomaqrcode - Design System + T1 Trang chu.dc.html" (artboard 1a/1b/1c)
   Mobile-first. Breakpoint: 375 (base) · 768 (tablet) · 1024 (desktop) · 1280 (max)
   ========================================================================== */

/* --------------------------------------------------------------- 1. Tokens */
:root {
  /* Màu chủ đạo — xanh ngọc, gợi tin cậy, không trùng nhận diện ngân hàng nào */
  --brand: #0F6E8C;
  --brand-dark: #0B5570;
  --brand-light: #E6F2F7;

  /* Màu nhấn — chỉ dùng cho hành động chính (Tạo mã QR / Tải về) */
  --accent: #84CC16;
  --accent-dark: #6DAA0F;
  --accent-ink: #0C1A08; /* tương phản 11:1 trên nền --accent */

  /* Chữ */
  --ink: #0C0F14;   /* 16.9:1 */
  --ink-2: #3A414E; /*  9.6:1 */
  --ink-3: #6B7280; /*  4.8:1 — AA */

  /* Nền & viền */
  --bg: #F6F8FA;
  --surface: #fff;
  --border: #E5E7EB;
  --border-strong: #CBD5E1;

  /* Trạng thái */
  --success: #0F7A3D;
  --success-bg: #ECFDF3;
  --success-border: #B7EBC8;
  --warning: #B45309;
  --warning-ink: #7C2D12;
  --warning-bg: #FFF7ED;
  --warning-border: #FED7AA;
  --danger: #B91C1C;
  --danger-bg: #FEF2F2;
  --danger-border: #FECACA;

  /* Nền tối (footer) */
  --dark: #0C0F14;
  --dark-ink: #CDD3DC;
  --dark-ink-2: #8B93A1;
  --dark-border: #2A313D;

  /* Spacing 4 · 8 · 12 · 16 · 24 · 32 · 48 · 64 */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px;

  /* Bo góc */
  --r-input: 8px;
  --r-card: 12px;
  --r-block: 16px;

  --container: 1200px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, .05);
  --shadow-bar: 0 -6px 20px rgba(0, 0, 0, .06);

  --font: Manrope, "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* ----------------------------------------------------------- 2. Nền tảng */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: var(--s-5); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }
img { height: auto; }

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); text-decoration: underline; }

h1, h2, h3 { margin: 0; letter-spacing: -.01em; font-weight: 800; }
h1 { font-size: 26px; line-height: 1.2; letter-spacing: -.02em; }
h2 { font-size: 24px; line-height: 1.25; }
h3 { font-size: 18px; line-height: 1.35; font-weight: 700; }
p  { margin: 0; }

input, select, textarea, button { font: inherit; color: inherit; }

:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; border-radius: 4px; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--s-4); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.icon { width: 20px; height: 20px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon--lg { width: 24px; height: 24px; }

/* ---------------------------------------------------------- 3. Component */

/* 3.1 Nút — cao 48 (mobile ≥44) */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  min-height: 48px; padding: 0 var(--s-4);
  border: 0; border-radius: 10px;
  font-size: 16px; font-weight: 700; text-align: center;
  cursor: pointer; transition: background-color .15s, border-color .15s, color .15s;
}
.btn:hover { text-decoration: none; }
.btn--accent { background: var(--accent); color: var(--accent-ink); font-weight: 800; }
.btn--accent:hover { background: var(--accent-dark); color: var(--accent-ink); }
.btn--primary { background: var(--brand); color: #fff; }
.btn--primary:hover { background: var(--brand-dark); color: #fff; }
.btn--ghost { background: var(--surface); color: var(--ink); border: 1.5px solid var(--border-strong); font-weight: 700; font-size: 15px; }
.btn--ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn--sm { min-height: 40px; font-size: 14px; }

/* 3.2 Chip / tab */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 44px; padding: 0 14px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); color: var(--ink);
  font-size: 14px; font-weight: 600; white-space: nowrap; cursor: pointer;
  transition: border-color .15s, background-color .15s, color .15s;
}
.chip:hover { border-color: var(--brand); color: var(--brand); text-decoration: none; }
.chip[aria-selected="true"], .chip.is-active {
  background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 700;
}
.chip[aria-selected="true"]:hover { color: #fff; }
.chip--quiet { background: var(--bg); }

/* 3.3 Field */
.field { display: flex; flex-direction: column; gap: 6px; }
.field__label {
  display: flex; justify-content: space-between; align-items: baseline; gap: var(--s-2);
  font-size: 14px; font-weight: 600;
}
.field__hint { color: var(--ink-3); font-weight: 500; }
.field__error { font-size: 13px; color: var(--danger); font-weight: 500; }
.input, .select, .textarea {
  width: 100%;
  border: 1.5px solid var(--border-strong); border-radius: 10px;
  background: var(--surface);
  font-size: 16px; /* ≥16px để iOS không tự phóng to khi focus */
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.input, .select { height: 48px; padding: 0 14px; }
.select { padding: 0 12px; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center; padding-right: 36px;
}
.textarea { padding: 12px 14px; resize: vertical; min-height: 96px; }
.input:focus, .select:focus, .textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-light); }
.input[aria-invalid="true"] { border-color: var(--danger); background: var(--danger-bg); }

/* 3.4 Toggle */
.toggle {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-3);
  width: 100%; min-height: 48px; padding: 0 14px;
  border: 1.5px solid var(--border-strong); border-radius: 10px;
  background: var(--surface); font-size: 15px; text-align: left; cursor: pointer;
}
.toggle__track {
  position: relative; flex-shrink: 0; width: 44px; height: 26px;
  border-radius: 13px; background: var(--border-strong); transition: background-color .2s;
}
.toggle__knob {
  position: absolute; top: 3px; left: 3px; width: 20px; height: 20px;
  border-radius: 50%; background: #fff; transition: left .2s;
}
.toggle[aria-checked="true"] .toggle__track { background: var(--brand); }
.toggle[aria-checked="true"] .toggle__knob { left: 21px; }

/* 3.5 Swatch màu */
.swatch {
  width: 24px; height: 24px; padding: 0;
  border: 2px solid #fff; border-radius: 50%;
  outline: 2px solid transparent; outline-offset: 2px;
  cursor: pointer;
}
.swatch[aria-pressed="true"] { outline-color: var(--brand); }

/* 3.6 Upload zone & slider — dùng cho trang thiết kế nâng cao (T7) và công cụ (T9) */
.dropzone {
  border: 2px dashed var(--border-strong); border-radius: var(--r-card);
  background: var(--bg); padding: 18px; text-align: center;
  font-size: 14px; color: var(--ink-2); cursor: pointer;
}
.dropzone:hover, .dropzone:focus-within { border-color: var(--brand); }
.dropzone small { display: block; color: var(--ink-3); font-size: 13px; }
.dropzone b { display: inline-block; margin-top: var(--s-2); color: var(--brand); }

.range { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.range input[type="range"] { flex: 1; height: 6px; accent-color: var(--brand); }
.range output { color: var(--ink-3); min-width: 40px; text-align: right; }

/* 3.7 Callout */
.callout { border-radius: 10px; padding: 12px 14px; font-size: 14px; line-height: 1.5; }
.callout--tip { background: var(--brand-light); color: var(--brand-dark); }
.callout--warn { background: var(--warning-bg); border: 1px solid var(--warning-border); color: var(--warning-ink); }
.callout--error { background: var(--danger-bg); border: 1px solid var(--danger-border); color: var(--danger); }
.callout--success { background: var(--success-bg); border: 1px solid var(--success-border); color: var(--success); font-weight: 600; }

/* 3.8 Card */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-card); padding: var(--s-4);
}
a.card { color: var(--ink); display: block; transition: border-color .15s; }
a.card:hover { border-color: var(--brand); text-decoration: none; }

/* 3.9 Breadcrumb */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13px; color: var(--ink-3); }
.breadcrumb [aria-current="page"] { color: var(--ink); font-weight: 600; }

/* 3.10 FAQ accordion — nội dung luôn nằm trong HTML, chỉ ẩn bằng CSS */
.faq { display: flex; flex-direction: column; gap: var(--s-2); }
.faq__item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-card); padding: 0 var(--s-4); }
.faq__q {
  display: flex; justify-content: space-between; align-items: center; gap: var(--s-3);
  min-height: 56px; font-size: 16px; font-weight: 700; cursor: pointer; list-style: none;
}
.faq__q::-webkit-details-marker { display: none; }
.faq__chevron { flex-shrink: 0; color: var(--brand); transition: transform .2s; }
.faq__item[open] .faq__chevron { transform: rotate(180deg); }
.faq__a { margin: 0 0 var(--s-4); color: var(--ink-2); }

/* 3.11 Khối CTA */
.cta {
  display: flex; flex-direction: column; gap: var(--s-2);
  background: var(--brand-dark); color: #fff;
  border-radius: var(--r-card); padding: var(--s-4);
}

/* ------------------------------------------------------------ 4. Header */
.site-header { position: relative; z-index: 20; background: var(--surface); border-bottom: 1px solid var(--border); }
.site-header__inner { display: flex; align-items: center; gap: var(--s-4); min-height: 56px; }
.logo {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-size: 18px; font-weight: 800; color: var(--ink); letter-spacing: -.01em;
}
.logo:hover { color: var(--ink); text-decoration: none; }
.logo__mark {
  display: grid; place-items: center; width: 26px; height: 26px;
  border-radius: 6px; background: var(--brand); color: #fff;
}
.nav-toggle {
  margin-left: auto; display: grid; place-items: center;
  width: 44px; height: 44px; border: 0; background: transparent; cursor: pointer; color: var(--ink);
}
.site-nav { display: none; }
.site-nav.is-open {
  display: block; position: absolute; left: 0; right: 0; top: 100%;
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: var(--s-2) var(--s-4) var(--s-4);
}
.site-nav ul { display: flex; flex-direction: column; gap: 0; margin: 0; padding: 0; list-style: none; }
.site-nav a {
  display: flex; align-items: center; min-height: 48px;
  font-size: 16px; font-weight: 600; color: var(--ink-2); border-bottom: 1px solid var(--border);
}
.site-nav li:last-child a { border-bottom: 0; }
.site-nav a:hover { color: var(--brand); text-decoration: none; }
.site-header__aside { display: none; }

/* -------------------------------------------------------------- 5. Hero */
.hero { background: var(--surface); padding: var(--s-4) 0 var(--s-5); }
.hero__inner { display: flex; flex-direction: column; gap: var(--s-4); }
.usp { display: flex; flex-wrap: wrap; gap: 4px 10px; font-size: 14px; color: var(--ink-2); }
.usp__lead { color: var(--brand); font-weight: 700; }

/* --------------------------------------------------------------- 6. Tool */
.tool { display: flex; flex-direction: column; gap: var(--s-4); }
.tool__tabs {
  display: flex; gap: var(--s-2); overflow-x: auto;
  margin: 0 calc(-1 * var(--s-4)); padding: 2px var(--s-4);
  scrollbar-width: none;
}
.tool__tabs::-webkit-scrollbar { display: none; }
.tool__tabs > * { flex-shrink: 0; }
.tool__all { display: inline-flex; align-items: center; min-height: 44px; padding: 0 var(--s-2); font-size: 14px; font-weight: 700; }

.tool__body { display: flex; flex-direction: column; gap: var(--s-4); }
.tool__col { display: flex; flex-direction: column; gap: var(--s-4); min-width: 0; }
.tool__form { display: flex; flex-direction: column; gap: var(--s-3); }
.tool__form-title { font-size: 20px; }

/* Hàng preview + tùy chỉnh (mobile: cạnh nhau để tool vừa một màn hình) */
.tool__panel {
  display: flex; gap: var(--s-4); align-items: flex-start;
  background: var(--bg); border: 1px solid var(--border); border-radius: 14px; padding: var(--s-3);
}
/* desktop: JS chuyển preview sang cột phải, tùy chỉnh xuống dưới form → panel rỗng */
#qr-tool[data-layout="desktop"] .tool__panel { display: none; }
.qr-preview { flex-shrink: 0; width: 132px; }
.qr-preview__frame {
  display: flex; flex-direction: column; align-items: center; gap: var(--s-2);
  background: #fff; /* Nền QR luôn trắng thuần để mọi máy quét đọc được */
  border: 1px solid #F1F3F6; border-radius: 10px; padding: var(--s-2);
}
.qr-preview.has-frame .qr-preview__frame { border: 3px solid var(--brand); }
.qr-preview__img { display: block; width: 100%; aspect-ratio: 1; } /* tỉ lệ cố định → không giật layout */
.qr-preview__cta { font-size: 11px; font-weight: 800; color: var(--brand); letter-spacing: .02em; }
.qr-preview:not(.has-frame) .qr-preview__cta { display: none; }
.qr-preview__meta { margin-top: 6px; font-size: 12px; color: var(--ink-3); text-align: center; }

.tool__custom { display: flex; flex-direction: column; gap: var(--s-2); flex: 1; min-width: 0; }
.tool__custom-title { display: none; font-size: 14px; font-weight: 700; color: var(--ink-3); }
/* Mobile: mỗi nhóm tùy chỉnh là một hàng riêng, tự xuống dòng trong cột hẹp */
.tool__custom-row { display: flex; flex-direction: column; gap: var(--s-2); }
.tool__custom-row > div { display: flex; flex-wrap: wrap; align-items: center; gap: 5px; min-width: 0; }
.tool__custom .qr-preview__meta { margin-top: 2px; text-align: left; }
.tool__custom-label { display: none; }
.opt__long { display: none; }
.opt {
  height: 32px; padding: 0 10px;
  border: 1px solid var(--border-strong); border-radius: var(--r-input);
  background: var(--surface); color: var(--ink);
  font-size: 12px; font-weight: 600; cursor: pointer; white-space: nowrap;
}
.opt[aria-pressed="true"] { border-color: var(--brand); background: var(--brand-light); color: var(--brand-dark); }
.opt--file { display: inline-flex; align-items: center; border-style: dashed; color: var(--brand); }
.opt--file input { display: none; }

.tool__actions { display: flex; flex-direction: column; gap: var(--s-2); }
.tool__sizes { display: flex; gap: 6px; }
.tool__sizes .opt { flex: 1; height: 36px; }
.tool__downloads { display: grid; grid-template-columns: 1.8fr 1fr 1fr; gap: var(--s-2); }
.tool__note { font-size: 13px; color: var(--ink-3); line-height: 1.5; }
.tool__leaf { font-size: 14px; font-weight: 700; }

/* Thanh "Tải về" bám đáy màn hình khi đang dùng tool trên mobile */
@media (max-width: 1023.98px) {
  .tool__actions {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
    background: var(--surface); border-top: 1px solid var(--border);
    box-shadow: var(--shadow-bar);
    padding: 10px var(--s-4) calc(14px + env(safe-area-inset-bottom, 0px));
    transform: translateY(110%); transition: transform .2s ease;
  }
  .tool__actions.is-pinned { transform: none; }
}

/* ------------------------------------------------------- 7. Nội dung T1 */
/* KHÔNG đặt tên class trùng class WordPress tự sinh: body_class() và
   post_class() phát ra `page`, `post`, `blog`, `home`, `single`, `category`,
   `archive`, `search`, `sticky`, `hentry`. Dùng `.page-grid`, `.post-card`. */
.page-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s-7); padding-top: var(--s-6); }
.blocks { display: flex; flex-direction: column; gap: var(--s-7); min-width: 0; }
.block { display: flex; flex-direction: column; gap: var(--s-3); }
.block > p { color: var(--ink-2); }
.block__head { display: flex; justify-content: space-between; align-items: baseline; gap: var(--s-4); flex-wrap: wrap; }

.steps { display: flex; flex-direction: column; gap: 10px; }
.step { display: flex; gap: 14px; }
.step__n { font-size: 32px; font-weight: 800; color: var(--brand); line-height: 1; }
.step h3 { margin-bottom: 4px; }
.step p { color: var(--ink-2); font-size: 15px; }

.groups { display: flex; flex-direction: column; gap: 10px; }
.group { display: flex; flex-direction: column; gap: 10px; }
.group__title {
  display: flex; align-items: center; gap: 10px;
  font-size: 16px; font-weight: 800; color: var(--ink);
}
.group__title:hover { color: var(--brand); text-decoration: none; }
.group__icon, .use__icon {
  display: grid; place-items: center; flex-shrink: 0;
  width: 32px; height: 32px; border-radius: var(--r-input);
  background: var(--brand-light); color: var(--brand);
}
.group__items { display: flex; flex-wrap: wrap; gap: 6px; }
.group__items .chip { min-height: 36px; font-size: 13px; padding: 0 10px; }

.vietqr { background: var(--brand-dark); color: #fff; border-radius: var(--r-block); padding: var(--s-5); display: flex; flex-direction: column; gap: 14px; }
.vietqr h2 { color: #fff; }
.vietqr p { font-size: 15px; opacity: .92; }
.vietqr__banks { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: var(--s-2); }
.bank {
  display: flex; align-items: center; gap: var(--s-2); min-height: 52px; line-height: 1.3;
  background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 10px; padding: var(--s-2) 10px;
  color: #fff; font-size: 13px; font-weight: 700;
}
.bank:hover { background: rgba(255, 255, 255, .16); color: #fff; text-decoration: none; }
.bank__logo {
  display: grid; place-items: center; flex-shrink: 0;
  /* Logo ngân hàng là lockup NGANG (tỉ lệ 2,5–4,3 : 1), không phải icon vuông —
     ô vuông 28px sẽ ép logo xuống còn ~10px chiều cao và không đọc được. */
  width: 72px; height: 28px; border-radius: 6px;
  background: #fff; font-size: 10px; font-weight: 800;
}
.vietqr__links { font-size: 14px; opacity: .9; }
.vietqr__links a { color: #fff; text-decoration: underline; }

.facts { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s-3); }
.fact b { font-size: 16px; }
.fact p { margin-top: 6px; font-size: 14px; color: var(--ink-2); }

.tips { margin: 0; padding-left: 20px; color: var(--ink-2); display: flex; flex-direction: column; gap: var(--s-2); font-size: 15px; }

.uses { display: flex; flex-direction: column; gap: var(--s-2); }
.use { display: flex; gap: var(--s-3); align-items: center; padding: 12px 14px; }
.use b { display: block; font-size: 15px; }
.use span span { font-size: 13px; color: var(--ink-2); }

.posts { display: flex; flex-direction: column; gap: 10px; }
.post-card { display: flex; gap: var(--s-3); overflow: hidden; padding: 0; }
.post__thumb {
  display: grid; place-items: center; flex-shrink: 0;
  width: 110px; aspect-ratio: 16 / 9; /* tỉ lệ cố định → tránh CLS khi thay ảnh thật */
  background: var(--brand-light); color: var(--brand);
  font-size: 10px; text-align: center; padding: 6px;
}
.post__body { display: flex; flex-direction: column; gap: 4px; padding: var(--s-3) var(--s-3) var(--s-3) 0; }
.post__cat { font-size: 11px; font-weight: 700; color: var(--brand); text-transform: uppercase; }
.post__title { font-size: 15px; font-weight: 700; line-height: 1.35; }

.sidebar { display: none; }
.sidebar__title { font-size: 14px; font-weight: 700; color: var(--ink-3); text-transform: uppercase; letter-spacing: .05em; }
.sidebar__box { display: flex; flex-direction: column; gap: var(--s-2); }
.sidebar__box a { font-size: 14px; color: var(--ink-2); }
.sidebar__box a:hover { color: var(--brand); }
.sidebar__box--tools a { font-weight: 600; color: var(--brand); }

/* ------------------------------------------------------------ 8. Footer */
.site-footer { margin-top: var(--s-7); background: var(--dark); color: var(--dark-ink); padding: var(--s-6) 0; font-size: 14px; }
.site-footer a { color: var(--dark-ink); }
.site-footer a:hover { color: #fff; }
.site-footer__cols { display: flex; flex-direction: column; gap: 14px; }
.site-footer__brand b { display: block; color: #fff; font-size: 17px; margin-bottom: var(--s-2); }
.site-footer__brand span { line-height: 1.55; }
.site-footer__col { display: none; flex-direction: column; gap: var(--s-2); }
.site-footer__col b { color: #fff; }
.site-footer__links { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-2) var(--s-4); }
.site-footer__legal { margin-top: var(--s-4); padding-top: var(--s-3); border-top: 1px solid var(--dark-border); font-size: 12px; color: var(--dark-ink-2); }

/* Chừa chỗ cho thanh tải về cố định trên mobile */
@media (max-width: 1023.98px) {
  body.has-pinned-bar { padding-bottom: 120px; }
}

/* ------------------------------------------------- 9. Tablet ≥ 768px */
@media (min-width: 768px) {
  .container { padding: 0 var(--s-5); }
  h1 { font-size: 34px; }
  h2 { font-size: 28px; }
  h3 { font-size: 20px; }

  .hero { padding: var(--s-6) 0 var(--s-5); }
  .usp { font-size: 17px; gap: 6px 14px; }

  .tool__tabs { flex-wrap: wrap; overflow: visible; margin: 0; padding: 0; }
  .tool__panel { gap: var(--s-5); padding: var(--s-4); }
  .qr-preview { width: 220px; }
  .qr-preview__cta { font-size: 16px; }

  .steps, .facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); }
  .step { flex-direction: column; gap: var(--s-2); background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-card); padding: var(--s-5); }
  .step__n { font-size: 40px; }
  .groups { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-4); align-items: start; }
  .vietqr { padding: var(--s-6); }
  .vietqr p { font-size: 16px; }
  .vietqr__banks { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .uses { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-4); }
  .use { flex-direction: column; align-items: flex-start; gap: var(--s-2); padding: var(--s-4); }
  .posts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); }
  .post-card { flex-direction: column; gap: 0; }
  .post__thumb { width: 100%; }
  .post__body { padding: 14px; }
  .post__title { font-size: 16px; }
  .site-footer__cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-5); }
  .site-footer__brand { grid-column: 1 / -1; }
  .site-footer__col { display: flex; }
  .site-footer__links { display: none; }
}

/* ------------------------------------------------ 10. Desktop ≥ 1024px */
@media (min-width: 1024px) {
  h1 { font-size: 40px; line-height: 1.15; }

  .site-header__inner { min-height: 64px; gap: var(--s-6); }
  .logo { font-size: 20px; }
  .logo__mark { width: 28px; height: 28px; border-radius: 7px; }
  .nav-toggle { display: none; }
  .site-nav, .site-nav.is-open { display: block; position: static; padding: 0; border: 0; }
  .site-nav ul { flex-direction: row; gap: var(--s-5); }
  .site-nav a { min-height: 0; font-size: 15px; border: 0; }
  .site-header__aside { display: block; margin-left: auto; font-size: 14px; font-weight: 700; }
  .site-nav__extra { display: none; }

  .hero { padding: 36px 0 var(--s-6); }
  .hero__intro { max-width: 880px; }
  .hero__inner { gap: var(--s-5); }

  /* Tool: khung nền + hai cột (form trái · preview phải 380px) */
  .tool { background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-block); padding: var(--s-5); gap: 18px; }
  .tool__body { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: var(--s-5); align-items: start; }
  .tool__col { gap: 14px; }
  .tool__custom {
    gap: var(--s-3); border-top: 1px solid var(--border); padding-top: 14px;
  }
  .tool__custom-title { display: block; }
  .tool__custom-row { flex-direction: row; flex-wrap: wrap; align-items: center; gap: var(--s-5); }
  .tool__custom-row > div { gap: var(--s-2); }
  .tool__custom-label { display: inline; font-size: 14px; color: var(--ink); }
  .opt { height: 32px; padding: 0 12px; font-size: 13px; }
  .opt__long { display: inline; }
  .swatch { width: 28px; height: 28px; }

  .qr-preview {
    width: 100%;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--r-block); padding: 18px; box-shadow: var(--shadow-card);
  }
  .qr-preview__frame { padding: 14px; border-radius: 14px; gap: var(--s-2); }
  .qr-preview__img { max-width: 280px; margin: 0 auto; }
  .qr-preview__cta { font-size: 18px; }
  .qr-preview__meta { font-size: 13px; }
  .tool__sizes .opt { height: 40px; font-size: 13px; }
  .tool__downloads { grid-template-columns: 1.6fr 1fr 1fr; }

  /* Nội dung: 2 cột + sidebar dính */
  .page-grid { grid-template-columns: minmax(0, 1fr) 300px; gap: 40px; padding-top: var(--s-7); }
  .blocks { gap: 56px; }
  .block { gap: var(--s-4); }
  .block--wide { gap: var(--s-5); }
  .sidebar { display: flex; flex-direction: column; gap: var(--s-4); position: sticky; top: var(--s-5); }
  .steps { gap: var(--s-5); }
  .uses, .posts { gap: var(--s-4); }
  .uses { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .vietqr__banks { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .vietqr__head { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--s-5); flex-wrap: wrap; }
  .vietqr__head > div { max-width: 600px; }
  .site-footer { padding: 40px 0 28px; }
  .site-footer__cols { grid-template-columns: 1.3fr repeat(5, 1fr); gap: var(--s-6); }
  .site-footer__brand { grid-column: auto; }
}

/* ---------------------------------------------------------------- T3 · T4
   Bổ sung cho hub VietQR và trang từng ngân hàng.
   Chỉ dùng token có sẵn ở :root, không thêm giá trị màu mới. */

/* Breadcrumb — danh sách nằm ngang, không đánh số, phân cách bằng dấu ›.
   (.breadcrumb ở trên chỉ style phần tử bao ngoài.) */
.breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "›";
  color: var(--ink-3);
}

.breadcrumb { margin: var(--s-3) 0; }

/* Thẻ ngân hàng trên NỀN SÁNG.
   .bank mặc định là chữ trắng vì khối .vietqr ở trang chủ có nền brand đậm;
   ở hub và trang leaf các thẻ nằm trong .block nền trắng nên phải đảo màu. */
.banks-light {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--s-2);
}

.banks-light .bank {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--ink);
}

.banks-light .bank:hover {
  background: var(--brand-light);
  border-color: var(--brand);
  color: var(--ink);
}

/* Logo thật thay ô chữ viết tắt: vừa khít ô 28px, nền trắng, tỉ lệ cố định. */
.bank__logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  padding: 2px;
  box-sizing: border-box;
}

/* Huy hiệu ngân hàng ở hero trang leaf — màu nhận diện chỉ dùng ở viền và nền,
   không đổi màu toàn trang (theo design brief T4). */
.bank-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  padding: 6px 12px 6px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-2);
}

.bank-badge img {
  width: 72px;
  height: 28px;
  border-radius: 6px;
  background: #fff;
  object-fit: contain;
}

@media (max-width: 767px) {
  .banks-light { grid-template-columns: repeat(auto-fill, minmax(165px, 1fr)); }
}

/* Dòng chú thích nhỏ dưới một khối, trên nền sáng. */
.note-line {
  margin: 0;
  font-size: 14px;
  color: var(--ink-2);
}

/* `display: flex` của .tool__tabs đè lên thuộc tính hidden của HTML, nên phải
   khai báo tường minh. Dùng khi trang chỉ phục vụ một loại QR (T3, T4). */
.tool__tabs[hidden] { display: none; }

/* ---------------------------------------------------------------- T6 · T2
   Lưới chọn loại mã QR và bảng so sánh. */

.type-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--s-2);
}

.type-card {
  display: flex;
  align-items: flex-start;
  gap: var(--s-3);
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  color: var(--ink);
  min-height: 44px;
}

.type-card:hover {
  border-color: var(--brand);
  background: var(--brand-light);
  color: var(--ink);
  text-decoration: none;
}

.type-card__icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--brand-light);
  color: var(--brand);
}

.type-card:hover .type-card__icon { background: #fff; }

.type-card__body { display: block; min-width: 0; }
.type-card__body b { display: block; font-size: 15px; }
.type-card__body span { display: block; margin-top: 2px; font-size: 13px; color: var(--ink-2); }

/* Bảng so sánh — cuộn ngang trên mobile thay vì phá vỡ bố cục. */
.block table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.block table th,
.block table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.block table th {
  font-weight: 700;
  color: var(--ink);
  background: var(--surface);
}

.block table tr:last-child td { border-bottom: 0; }

/* ============================================================ T5 · T7–T14
   Component cho blog, trang tĩnh, công cụ bổ trợ, thư viện mẫu và bảng QR.
   Chỉ dùng token có sẵn ở :root. */

/* --- Bài viết và trang tĩnh (T10, T13, T14) --- */
.article { max-width: 100%; }
.article__head h1 { margin-bottom: 8px; }
.article__meta { margin: 0 0 var(--s-3); font-size: 14px; color: var(--ink-2); }
.article__summary { margin-bottom: var(--s-3); }

.article__body { font-size: 17px; line-height: 1.7; color: var(--ink); max-width: 72ch; }
.article__body h2 { margin: var(--s-5) 0 var(--s-2); font-size: 24px; }
.article__body h3 { margin: var(--s-4) 0 var(--s-2); font-size: 19px; }
.article__body p, .article__body ul, .article__body ol { margin: 0 0 var(--s-3); }
.article__body ul, .article__body ol { padding-left: 22px; }
.article__body li { margin-bottom: 6px; }
.article__body img { height: auto; border-radius: var(--r-card); }
.article__body blockquote {
  margin: 0 0 var(--s-3);
  padding: 12px var(--s-3);
  border-left: 3px solid var(--brand);
  background: var(--surface);
  border-radius: 0 var(--r-card) var(--r-card) 0;
}

/* CTA tool chèn ngay đầu bài, theo CLAUDE.md mục 5. */
.article__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
  margin: 0 0 var(--s-4);
  padding: 14px var(--s-3);
  background: var(--brand-light);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
}
.article__cta b { display: block; font-size: 16px; }
.article__cta span { display: block; font-size: 14px; color: var(--ink-2); }

/* --- Mục lục (T13, T14) --- */
.toc {
  margin: 0 0 var(--s-4);
  padding: var(--s-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
}
.toc__title { display: block; margin-bottom: 8px; font-size: 14px; color: var(--ink-2); }
.toc ul { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 4px; }
.toc a { font-size: 15px; }

/* --- Thanh lọc danh mục blog (T11) --- */
.cat-nav { display: flex; flex-wrap: wrap; gap: 8px; margin: var(--s-3) 0 var(--s-4); }
.chip--on { background: var(--brand); border-color: var(--brand); color: #fff; }
.chip--on:hover { color: #fff; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }

/* --- Công cụ bổ trợ (T9) --- */
.tool--simple .tool__body { display: block; }
.tool__output { margin-top: var(--s-3); }

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 180px;
  padding: var(--s-4);
  text-align: center;
  border: 2px dashed var(--border);
  border-radius: var(--r-card);
  background: var(--surface);
  cursor: pointer;
  color: var(--ink-2);
}
.dropzone:hover, .dropzone:focus-visible, .dropzone--on {
  border-color: var(--brand);
  background: var(--brand-light);
}
.dropzone b { font-size: 16px; color: var(--ink); }
.dropzone span { font-size: 13px; }

.result { margin-top: var(--s-3); }
.result__label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--ink-2); }
.result__text {
  margin: 0 0 var(--s-3);
  padding: 12px var(--s-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-all;
}
.result__actions { display: flex; flex-wrap: wrap; gap: 8px; }

.cam { margin-top: var(--s-3); }
.cam__video { width: 100%; max-width: 420px; margin-top: var(--s-2); border-radius: var(--r-card); background: #000; display: block; }

.table-wrap { overflow-x: auto; margin-bottom: var(--s-3); }
.barcode-preview {
  display: grid;
  place-items: center;
  padding: var(--s-3);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
}
.barcode-preview svg { max-width: 100%; height: auto; }

.toast {
  margin-top: var(--s-3);
  padding: 10px var(--s-3);
  border-radius: var(--r-card);
  font-size: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
}
.toast--ok { background: #ECFDF3; border-color: #B7EBC8; color: #0F7A3D; }
.toast--error { background: #FEF2F2; border-color: #FECACA; color: #B91C1C; }

/* --- Thư viện mẫu (T8) --- */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--s-3);
  margin-bottom: var(--s-4);
}
.gallery__item { display: block; color: var(--ink); }
.gallery__item:hover { text-decoration: none; }
.gallery__item:hover .gallery__thumb { border-color: var(--brand); }
.gallery__thumb {
  display: grid;
  place-items: center;
  gap: 8px;
  aspect-ratio: 3 / 4;
  margin-bottom: 8px;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: #fff;
  color: var(--m-color, var(--brand));
}
.gallery__thumb em { font-style: normal; font-size: 12px; font-weight: 700; }
.gallery__item b { display: block; font-size: 15px; }
.gallery__item > span:last-child { display: block; margin-top: 2px; font-size: 13px; color: var(--ink-2); }

/* --- Bảng QR để bàn (T5) --- */
.board-wrap { display: grid; place-items: center; }
.board {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  max-width: 300px;
  padding: var(--s-4) var(--s-3);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  text-align: center;
}
.board--a5 { aspect-ratio: 148 / 210; }
.board--a6 { aspect-ratio: 105 / 148; }
.board__shop { font-size: 17px; font-weight: 800; }
.board__title { font-size: 13px; font-weight: 800; letter-spacing: .04em; color: var(--brand); }
.board__sub { font-size: 12px; color: var(--ink-3); }
.board__qr { width: 62%; margin: 4px 0; }
.board__qr svg { width: 100%; height: auto; display: block; }
.board__qr-empty {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border: 1px dashed var(--border);
  border-radius: 8px;
  font-size: 12px;
  color: var(--ink-3);
  padding: 8px;
}
.board__bank { font-size: 14px; font-weight: 700; }
.board__name { font-size: 13px; font-weight: 700; }
.board__acc { font-size: 13px; color: var(--ink-2); }
.board__amount { font-size: 16px; font-weight: 800; color: #4D7C0F; }
.board__memo { font-size: 12px; color: var(--ink-2); }
.board__foot { margin-top: auto; font-size: 10px; color: var(--ink-3); }

@media (max-width: 767px) {
  .article__body { font-size: 16px; }
  .gallery { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .article__cta { flex-direction: column; align-items: flex-start; }
}

/* --- Ảnh xem trước của thư viện mẫu (T8) --- */
/* Mỗi mẫu vẽ hoạ tiết riêng theo màu và kiểu điểm của nó, thay cho một icon
   dùng chung — xem inc/templates-gallery.php: taomaqrcode_gallery_preview_svg(). */
.gallery__qr { width: 62%; max-width: 120px; height: auto; display: block; }
.gallery__thumb--frame { border-color: var(--m-color, var(--brand)); border-width: 2px; }
.gallery__thumb em { color: var(--m-color, var(--brand)); text-align: center; padding: 0 6px; }

/* --- Ảnh bài viết (thumbnail sinh sẵn 1200×630) --- */
/* aspect-ratio cố định để ảnh chưa tải xong không làm nhảy layout (CLS). */
.post__thumb { display: block; width: 100%; height: auto; aspect-ratio: 1200 / 630; object-fit: cover; }
.type-card--thumb { flex-direction: column; align-items: stretch; gap: 0; padding: 0; overflow: hidden; }
.type-card__img { display: block; width: 100%; height: auto; aspect-ratio: 1200 / 630; object-fit: cover; }
.type-card--thumb .type-card__body { padding: var(--s-3); }

/* --- Phân trang (trang /blog/, danh mục, trang tác giả) --- */
/* Bộ này áp cho cả the_posts_pagination() lẫn paginate_links() tự bọc, vì cả hai
   đều dùng .nav-links + .page-numbers. */
.navigation.pagination { margin-top: var(--s-5); }
.navigation.pagination .screen-reader-text { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.nav-links { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.page-numbers {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 44px; height: 44px; padding: 0 12px;
  border: 1px solid var(--border); border-radius: var(--r-card);
  font-size: 15px; font-weight: 600; color: var(--ink); background: #fff;
  text-decoration: none;
}
.page-numbers:hover { border-color: var(--brand); color: var(--brand); }
.page-numbers.current { background: var(--brand); border-color: var(--brand); color: #fff; }
.page-numbers.dots { border-color: transparent; background: none; }
.page-numbers.prev, .page-numbers.next { font-weight: 700; }