/* Royalis: nền chung (màu, chữ, header, nút, chân trang), khối Thử thêu tên, hỏi đáp.
   Các khối còn lại của trang chủ nằm ở home.css. Đỏ #b3121b, trắng kem, chữ đen ấm. */
:root {
  color-scheme: light;
  --red: #b3121b;
  --red-dark: #8c0d14;
  --red-tint: #fbeceb;
  --ink: #1d1a17;
  --ink-2: #4a433d;
  --muted: #6b625a;
  --cream: #f7f1e8;
  --paper: #fffdfa;
  --line: #e7ddd0;
  --radius: 16px;
  --maxw: 1120px;
  --font-body: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Playfair Display", Georgia, "Times New Roman", serif;
  --font-script: "Dancing Script", "Segoe Script", "Brush Script MT", cursive;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 400 16px/1.6 var(--font-body);
  color: var(--ink);
  background: var(--paper);
}
img, svg { max-width: 100%; }
h1, h2, h3, p { margin: 0; }
a { color: inherit; }
[hidden] { display: none !important; }

.wrap { width: min(100% - 32px, var(--maxw)); margin-inline: auto; }
.narrow { max-width: 760px; }
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip {
  position: absolute; left: 16px; top: -48px; z-index: 100;
  background: var(--ink); color: #fff; padding: 10px 14px; border-radius: 8px;
}
.skip:focus { top: 12px; }
:focus-visible { outline: 3px solid var(--red); outline-offset: 3px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgb(255 253 250 / .92);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.bar { display: flex; align-items: center; gap: 24px; min-height: 60px; }
.logo {
  display: inline-flex; align-items: center; gap: 8px; color: var(--red);
  text-decoration: none; font: 700 1.5rem/1 var(--font-display); letter-spacing: .01em;
}
.nav { display: none; margin-left: auto; gap: 22px; font-size: .95rem; }
.nav a { text-decoration: none; color: var(--ink-2); padding: 8px 0; }
.nav a:hover { color: var(--red); }
.site-header .btn { margin-left: auto; }
@media (min-width: 900px) {
  .nav { display: flex; }
  .site-header .btn { margin-left: 0; }
}

/* Nút */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 22px; border-radius: 999px; border: 2px solid var(--red);
  background: var(--red); color: #fff; font: 600 1rem/1 var(--font-body);
  text-decoration: none; cursor: pointer; text-align: center;
  transition: background .15s, color .15s, transform .15s;
}
.btn:hover { background: var(--red-dark); border-color: var(--red-dark); }
.btn:active { transform: translateY(1px); }
.btn-sm { min-height: 40px; padding: 0 18px; font-size: .95rem; }
.btn-ghost { background: transparent; color: var(--red); }
.btn-ghost:hover { background: var(--red-tint); color: var(--red-dark); }
.btn-light { background: #fff; border-color: #fff; color: var(--red); }
.btn-light:hover { background: var(--cream); border-color: var(--cream); color: var(--red-dark); }

/* Chữ */
h1 {
  font: 700 clamp(2.3rem, 7vw, 4.2rem)/1.06 var(--font-display);
  letter-spacing: -.01em;
}
h2 {
  font: 700 clamp(1.7rem, 4.2vw, 2.6rem)/1.15 var(--font-display);
  letter-spacing: -.005em; max-width: 24ch;
}
h3 { font: 600 1.125rem/1.35 var(--font-body); }
.lead { font-size: clamp(1.02rem, 2.4vw, 1.2rem); color: var(--ink-2); margin-top: 14px; max-width: 46ch; }
.sub { color: var(--ink-2); margin-top: 12px; max-width: 62ch; }

/* Hình khăn thêu minh họa (vẽ bằng mã, xem towel.js) */
.towel-svg { display: block; width: 100%; height: auto; }
.towel-svg .towel-body { fill: var(--towel, #f3e9d8); }
.towel-svg .band { fill: var(--band, #e3d6bf); }
.towel-svg .f { fill: var(--thread, #b3121b); stroke: var(--thread-dark, #7a0c12); stroke-width: 1; stroke-dasharray: 2.5 2; stroke-linejoin: round; }
.towel-svg .d { fill: var(--thread-dark, #7a0c12); }
.towel-svg .m { fill: none; stroke: var(--thread-dark, #7a0c12); stroke-width: 2; stroke-linecap: round; }
.towel-svg .name-main {
  font-family: var(--font-script); font-weight: 700;
  fill: var(--thread, #b3121b); stroke: var(--thread-dark, #7a0c12);
  stroke-width: .9; stroke-dasharray: 3 2.4; paint-order: stroke;
}
.towel-svg .name-hi { font-family: var(--font-script); font-weight: 700; fill: #fff; opacity: .35; transform: translate(-1px, -1px); }
.towel-svg .logo-box { fill: none; stroke: var(--thread, #b3121b); stroke-width: 3; stroke-dasharray: 6 5; }
.towel-svg .logo-txt { fill: var(--thread, #b3121b); font: 700 20px var(--font-body); letter-spacing: .12em; }
.box-svg { display: block; }

/* Khối Thử thêu tên: bản xem thử bên trái, lựa chọn bên phải */
.builder {
  display: grid; gap: 18px; margin-top: 32px;
  background: #fff; border: 1px solid var(--line); border-radius: 24px;
  padding: clamp(14px, 3vw, 28px); box-shadow: 0 18px 40px -26px rgb(60 30 20 / .4);
}
@media (min-width: 900px) {
  .builder { grid-template-columns: 1.05fr .95fr; align-items: center; gap: 36px; }
}
.preview {
  margin: 0; padding: clamp(10px, 3vw, 28px); border-radius: 18px;
  background: linear-gradient(180deg, var(--cream), #f0e6d8);
}
.preview figcaption { color: var(--muted); font-size: .82rem; text-align: center; margin-top: 4px; }

.controls { display: grid; gap: 14px; }
.field { border: 0; margin: 0; padding: 0; min-width: 0; }
.lbl { display: block; font-weight: 600; font-size: .92rem; margin-bottom: 8px; padding: 0; }
#ten {
  width: 100%; min-height: 52px; padding: 0 16px; font: 500 1.1rem/1 var(--font-body);
  border: 2px solid var(--line); border-radius: 14px; background: var(--paper); color: var(--ink);
}
#ten:focus { border-color: var(--red); outline: none; box-shadow: 0 0 0 4px var(--red-tint); }
#ten::placeholder { color: #756b62; }
.hint { color: var(--muted); font-size: .8rem; margin-top: 6px; }

.sw { display: flex; flex-wrap: wrap; gap: 10px; }
.sw label { position: relative; display: block; }
.sw input { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }
.sw .dot {
  display: block; width: 40px; height: 40px; border-radius: 50%; background: var(--c);
  border: 3px solid #fff; box-shadow: 0 0 0 1px var(--line); transition: box-shadow .12s;
}
.sw input:checked + .dot { box-shadow: 0 0 0 3px var(--ink); }
.sw input:focus-visible + .dot { outline: 3px solid var(--red); outline-offset: 4px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips label { position: relative; display: block; }
.chips input { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }
.chips .chip {
  display: block; padding: 10px 16px; border-radius: 999px; border: 2px solid var(--line);
  font-size: .92rem; font-weight: 500; background: #fff; color: var(--ink-2);
}
.chips input:checked + .chip { background: var(--ink); border-color: var(--ink); color: #fff; }
.chips input:focus-visible + .chip { outline: 3px solid var(--red); outline-offset: 3px; }

.actions { display: grid; gap: 10px; }
@media (min-width: 520px) { .actions { grid-template-columns: auto 1fr; } }
.status { min-height: 1.4em; font-size: .9rem; color: var(--red-dark); margin-top: -4px; }

/* Hỏi đáp */
.faq { margin-top: 24px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; list-style: none; padding: 18px 36px 18px 0; font-weight: 600; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font: 400 1.6rem/1 var(--font-body); color: var(--red);
}
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--ink-2); padding: 0 0 18px; max-width: 62ch; }
.faq details a { color: var(--red); }

/* Chân trang */
.site-footer { background: var(--ink); color: #efe8dd; padding: 36px 0; }
.foot { display: grid; gap: 20px; }
@media (min-width: 700px) { .foot { grid-template-columns: 1fr auto; align-items: end; } }
.foot-logo { font: 700 1.6rem/1.1 var(--font-display); color: #fff; margin-bottom: 6px; }
.site-footer a { color: #fff; }
.site-footer .copy { margin-top: 6px; color: #b9afa2; font-size: .9rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* Khi khối Thử thêu tên xếp dọc, không để bản xem thử quá to */
@media (max-width: 899px) {
  .preview { width: 100%; max-width: 540px; margin-inline: auto; }
}