/* site.css — giao diện chung của các trang mới (cổng, hướng dẫn, skills, hợp tác).
   Phong cách đọc là chính: nền sáng nhạt, chữ to, cột hẹp, nút bo tròn.
   Lấy hướng giao diện từ nghiathanhvo.com (theme xanh lá); màu được viết lại ở đây,
   không chép file. Thanh đầu trang dùng xanh đậm hơn một bậc để chữ trắng đủ tương phản.
   Sáng / tối: theo máy, hoặc theo nút trên đầu trang (lưu trong trình duyệt, site.js).
   Trang bán Bộ Cứu Hộ, checkout, admin, doi-chieu vẫn dùng styles.css riêng. */

:root {
  --bg: #f7f9f6; --ink: #1c2420; --soft: #56605a; --line: #dde5df;
  --accent: #4a7056; --accent-ink: #ffffff; --link: #3f6349;
  --code: #eef2ee; --box: #edf3ee;
  --head-bg: #4a7056; --head-ink: #ffffff; --logo-2: #e4f5b8;
  --good: #1f6b3d; --warn: #8a5a00; --bad: #a33a3a;
  --c-blue: #2563eb; --c-violet: #7c3aed; --c-amber: #b45309; --c-green: #0f7a5c; --c-red: #c2410c;
  --card: #ffffff;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131915; --ink: #e7ece8; --soft: #a3aea6; --line: #2b352f;
    --accent: #86b393; --accent-ink: #0f1511; --link: #93c4a0;
    --code: #1c241f; --box: #1a221d;
    --head-bg: #3f5f48; --head-ink: #ffffff; --logo-2: #e4f5b8;
    --good: #6fd39a; --warn: #f0c35a; --bad: #f08a8a;
    --c-blue: #8db4ff; --c-violet: #c2a8ff; --c-amber: #f5b95a; --c-green: #5fd3b0; --c-red: #ff9a7a;
    --card: #1a221d;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #131915; --ink: #e7ece8; --soft: #a3aea6; --line: #2b352f;
  --accent: #86b393; --accent-ink: #0f1511; --link: #93c4a0;
  --code: #1c241f; --box: #1a221d;
  --head-bg: #3f5f48; --head-ink: #ffffff; --logo-2: #e4f5b8;
  --good: #6fd39a; --warn: #f0c35a; --bad: #f08a8a;
  --c-blue: #8db4ff; --c-violet: #c2a8ff; --c-amber: #f5b95a; --c-green: #5fd3b0; --c-red: #ff9a7a;
  --card: #1a221d;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-size: 19px; line-height: 1.65;
}
.wrap { max-width: 700px; margin: 0 auto; padding: 0 16px; }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* đầu trang */
.site-head { background: var(--head-bg); color: var(--head-ink); margin-bottom: 44px; }
.site-head .wrap { max-width: 1000px; }
.head-row { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px 28px; padding-top: 20px; padding-bottom: 20px; }
.brand { color: var(--head-ink); text-decoration: none; line-height: 1; }
.logo-brackets { position: relative; display: inline-block; padding: 7px 12px 6px; font-weight: 800; font-size: 28px; letter-spacing: .02em; }
.logo-brackets::before, .logo-brackets::after { content: ""; position: absolute; width: 12px; height: 12px; border-color: var(--logo-2); border-style: solid; }
.logo-brackets::before { left: 0; top: 0; border-width: 3px 0 0 3px; }
.logo-brackets::after { right: 0; bottom: 0; border-width: 0 3px 3px 0; }
.logo-brackets b { color: var(--logo-2); font-weight: 800; margin-left: 6px; }
.site-head nav { display: flex; flex-wrap: wrap; gap: 6px 22px; font-size: 18px; align-items: center; }
.site-head nav a { color: var(--head-ink); text-decoration: none; opacity: .94; }
.site-head nav a:hover, .site-head nav a[aria-current] { opacity: 1; text-decoration: underline; text-underline-offset: 7px; text-decoration-thickness: 2px; }
.site-head nav a.nav-cta { color: var(--head-bg); background: var(--head-ink); font-weight: 700; opacity: 1; padding: 8px 16px; border-radius: 999px; }
.site-head nav a.nav-cta:hover { text-decoration: none; filter: brightness(.95); }
.theme-toggle {
  font: inherit; font-size: 15px; color: var(--head-ink); background: transparent;
  border: 1.5px solid rgba(255,255,255,.55); border-radius: 999px; padding: 5px 12px; cursor: pointer;
}
.theme-toggle:hover { background: rgba(255,255,255,.14); }

/* chữ */
h1, h2, h3 { color: var(--ink); line-height: 1.2; letter-spacing: -.015em; }
h1 { font-size: 34px; margin: 0 0 14px; }
h2 { font-size: 25px; margin: 44px 0 12px; }
h3 { font-size: 20px; margin: 28px 0 8px; }
p, ul, ol { margin: 0 0 18px; }
li { margin-bottom: 6px; }
.lead { color: var(--soft); font-size: 21px; }
.fine { color: var(--soft); font-size: 16px; }
code { font-family: var(--mono); font-size: .82em; background: var(--code); padding: 2px 5px; border-radius: 4px; }

/* cổng: danh sách thẻ liên kết */
.hero { margin-bottom: 30px; }
.cards { list-style: none; padding: 0; margin: 0 0 30px; display: grid; gap: 12px; }
.card-link {
  display: block; text-decoration: none; color: var(--ink);
  background: var(--box); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px;
}
.card-link:hover { border-color: var(--accent); }
.card-link b { display: block; font-size: 20px; line-height: 1.3; }
.card-link span { display: block; color: var(--soft); font-size: 17px; }
.card-link .tag { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--warn); margin-bottom: 2px; }
.contact-list { list-style: none; padding: 0; margin: 0 0 30px; }
.contact-list li { padding: 10px 0; border-bottom: 1px solid var(--line); margin: 0; }
.contact-list li span { display: inline-block; min-width: 96px; color: var(--soft); }

/* hướng dẫn: menu bên trái + danh sách */
.wrap-wide { max-width: 1000px; }
.sub-layout { display: grid; grid-template-columns: 1fr; gap: 26px; }
@media (min-width: 820px) { .sub-layout { grid-template-columns: 220px 1fr; gap: 44px; } }
.side { font-size: 17px; }
.side h2 { font-size: 14px; letter-spacing: .06em; text-transform: uppercase; color: var(--soft); margin: 0 0 8px; }
.side ul { list-style: none; padding: 0; margin: 0 0 22px; }
.side a { display: block; padding: 5px 0; color: var(--ink); text-decoration: none; }
.side a:hover, .side a[aria-current] { color: var(--link); text-decoration: underline; }
.post-list { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 14px; }
.post-list .card-link h3 { margin: 0 0 4px; font-size: 21px; }
.post-list .meta { color: var(--soft); font-size: 15px; }
.empty { background: var(--box); border: 1px dashed var(--line); border-radius: 12px; padding: 18px 20px; color: var(--soft); }

/* khối chú ý dùng chung */
.luu-y { background: var(--box); border: 1px solid var(--line); border-left: 4px solid var(--warn); border-radius: 10px; padding: 14px 16px; margin: 18px 0; }
.luu-y p:last-child { margin-bottom: 0; }

/* chân trang */
.site-foot { border-top: 1px solid var(--line); margin-top: 56px; padding: 26px 0 56px; color: var(--soft); font-size: 16px; }
.site-foot p { margin: 0 0 8px; }
.site-foot a { color: var(--soft); }

@media (max-width: 520px) {
  body { font-size: 18px; }
  h1 { font-size: 30px; }
  .head-row { gap: 12px 16px; }
  .site-head nav { gap: 6px 16px; font-size: 17px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }

/* cổng "/": thẻ giữa trang kiểu link-in-bio (cấu trúc lấy từ everestchris.com, màu và logo của mình) */
.card-page { min-height: 100vh; }
.theme-toggle.float { position: fixed; top: 14px; right: 14px; z-index: 5; color: var(--ink); background: var(--bg); border-color: var(--line); }
.theme-toggle.float:hover { background: var(--box); }
.card-wrap { max-width: 460px; margin: 0 auto; padding: 56px 16px 40px; }
.card-main { background: var(--card); border: 1px solid var(--line); border-radius: 20px; overflow: hidden; box-shadow: 0 10px 34px rgba(20, 40, 28, .12); }
.banner {
  padding: 26px 24px 28px; color: #fff;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(228,245,184,.32), transparent 55%),
    radial-gradient(90% 80% at 0% 100%, rgba(16,32,22,.55), transparent 60%),
    linear-gradient(135deg, #2c4636, #4a7056);
}
.banner .avatar { display: block; width: 96px; height: 96px; border-radius: 50%; border: 3px solid rgba(255,255,255,.92); box-shadow: 0 4px 14px rgba(0,0,0,.35); background: #3f6349; }
.banner h1 { color: #fff; font-size: 30px; margin: 14px 0 4px; }
.banner p { margin: 0; color: rgba(255,255,255,.9); font-size: 16px; line-height: 1.45; }
.rows { list-style: none; margin: 0; padding: 10px 12px 12px; }
.rows > li { margin: 0; }
.row { display: flex; align-items: center; gap: 14px; padding: 12px; border-radius: 12px; text-decoration: none; color: var(--ink); cursor: pointer; list-style: none; }
.row:hover { background: var(--box); }
.row::-webkit-details-marker { display: none; }
.tile {
  flex: none; width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  color: var(--c); background: rgba(0,0,0,.06);
  background: color-mix(in srgb, var(--c) 15%, transparent);
}
.txt { flex: 1; min-width: 0; }
.txt b { display: block; font-size: 17px; font-weight: 600; line-height: 1.3; }
.txt > span { display: block; color: var(--soft); font-size: 15px; line-height: 1.4; }
.tag { display: inline-block; vertical-align: 1px; margin-left: 6px; font-size: 12px; font-weight: 700; color: var(--warn); background: rgba(138,90,0,.13); border-radius: 999px; padding: 1px 8px; }
.chev { flex: none; color: var(--soft); }
.row-details[open] .chev.down { transform: rotate(180deg); }
.contact-list.in-card { margin: 2px 12px 10px 68px; }
.contact-list.in-card li { font-size: 16px; padding: 7px 0; }
.contact-list.in-card li span { min-width: 60px; }
.card-foot { text-align: center; color: var(--soft); font-size: 14px; margin: 18px 6px 0; }
@media (max-width: 420px) { .card-wrap { padding-top: 60px; } .banner h1 { font-size: 28px; } }

/* lưới ô có ảnh bìa: dùng cho /huong-dan/, /san-pham, /skills */
.wrap-wide .lead { max-width: 640px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; }
.chip { font: inherit; font-size: 15px; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 5px 14px; cursor: pointer; }
.chip:hover { border-color: var(--accent); }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.grid { list-style: none; padding: 0; margin: 0 0 30px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.grid > li { margin: 0; }
.grid > li[hidden] { display: none; }
.gcard { display: block; height: 100%; padding: 10px; border-radius: 18px; color: var(--ink); text-decoration: none; }
.gcard:hover, .gcard:focus-visible { background: var(--box); }
.gimg { display: block; aspect-ratio: 1 / 1; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: var(--box); }
.gimg img { display: block; width: 100%; height: 100%; object-fit: cover; }
.gcard h3 { margin: 14px 4px 6px; font-size: 20px; line-height: 1.3; }
.gcard:hover h3::after, .gcard:focus-visible h3::after { content: " \2192"; }
.gcard p { margin: 0 4px 10px; color: var(--soft); font-size: 16px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.gmeta { display: block; margin: 0 4px; color: var(--soft); font-size: 15px; }
.gmeta .dot { margin: 0 6px; }
.gmeta .tag { margin-left: 0; }
@media (max-width: 860px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .grid { grid-template-columns: minmax(0, 1fr); } }
/* ảnh bìa có nền sáng cố định: hạ độ sáng chút khi nền tối cho đỡ chói */
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .gimg img { filter: brightness(.9); } }
:root[data-theme="dark"] .gimg img { filter: brightness(.9); }

/* nút (trang sản phẩm có nút mua) */
.btn { display: inline-block; font: inherit; font-weight: 700; text-decoration: none; text-align: center; cursor: pointer; border: 0; border-radius: 999px; padding: 12px 24px; background: var(--accent); color: var(--accent-ink); }
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn-lg { padding: 14px 30px; font-size: 18px; }