:root { --ink: #0f3d2e; --mid: #3d6b58; --deep: #0b5a4c; --g2: #149a7f; --lime: #8df55f; --cream: #fbfff4; --tint: #ecfbea; --line: #cfeecf; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--cream); color: var(--ink); font-family: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', sans-serif; font-size: 17.5px; line-height: 1.7; }
a { color: var(--deep); }
.top { position: sticky; top: 0; z-index: 20; background: linear-gradient(100deg, #8df55f 0%, #4fd482 55%, #14967d 100%); }
.top .in { max-width: 1120px; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand img { width: 38px; height: 38px; }
.brand b { display: block; font-family: 'Montserrat', sans-serif; font-weight: 800; font-size: 15px; line-height: 1.15; }
.brand small { display: block; font-size: 11.5px; font-weight: 700; color: #124d36; }
.top nav a { font-weight: 700; font-size: 14.5px; text-decoration: none; color: var(--ink); padding: 8px 12px; border-radius: 99px; white-space: nowrap; }
.top nav { display: flex; align-items: center; gap: 4px; }
.top nav a.on, .top nav a:hover { background: rgba(255,255,255,.55); }
.lsw { display: inline-flex; margin-left: 6px; padding: 3px; border-radius: 99px; background: rgba(255,255,255,.55); }
.top nav .lsw a { padding: 5px 11px; font-size: 13px; font-weight: 800; letter-spacing: .04em; }
.top nav .lsw a[aria-current] { background: var(--deep); color: #fff; }
.more-h { margin: 40px 0 0; font-family: 'Montserrat', sans-serif; font-size: 20px; }
.en h3 { margin: 18px 0 0; font-size: 17px; }
.en ul { margin: 10px 0 0; padding-left: 20px; font-size: 16px; }
.sw2 { font-weight: 700; }
.ti { position: relative; display: inline-block; text-indent: 0; }
.ti-b { display: inline-flex; align-items: center; justify-content: center; width: 19px; height: 19px; margin: 0 1px 0 3px; padding: 0; vertical-align: 2px; border: 1.6px solid var(--g2); border-radius: 50%; background: #fff; color: var(--g2); font: italic 800 12px/1 Georgia, 'Times New Roman', serif; cursor: pointer; }
.ti-b:hover, .ti.on .ti-b { background: var(--g2); color: #fff; }
.ti-p { display: none; position: absolute; z-index: 40; left: 50%; bottom: calc(100% + 10px); transform: translateX(-50%); width: 290px; padding: 11px 13px; border-radius: 12px; background: var(--deep); color: #f3fff0; font-size: 14px; font-weight: 500; font-style: normal; line-height: 1.55; text-align: left; box-shadow: 0 12px 30px rgba(8, 70, 60, .28); }
.ti-p b { display: block; margin-bottom: 3px; color: #c4fba4; font-weight: 800; }
.ti.on .ti-p { display: block; }
@media (hover: hover) { .ti:hover .ti-p { display: block; } }
.pn { margin: 34px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pn a { display: block; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; background: #fff; text-decoration: none; color: var(--g2); font-size: 14px; font-weight: 800; }
.pn a b { display: block; margin-top: 4px; color: var(--ink); font-size: 15px; line-height: 1.4; font-weight: 700; }
.pn .nx { text-align: right; }
.rel { max-width: 1120px; margin: 0 auto; padding: 10px 0 10px 20px; }
.rel h2 { margin: 0 0 12px; font-family: 'Montserrat', sans-serif; font-size: 20px; }
.rel-row { display: flex; gap: 14px; overflow-x: auto; scroll-snap-type: x mandatory; padding: 2px 20px 14px 0; -webkit-overflow-scrolling: touch; scrollbar-width: thin; }
.rc { flex: 0 0 260px; scroll-snap-align: start; display: block; text-decoration: none; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.rc img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; display: block; }
.rc span { display: block; padding: 12px 14px 14px; }
.rc small { display: block; font-size: 12px; font-weight: 800; color: var(--g2); letter-spacing: .04em; }
.rc b { display: block; margin-top: 4px; font-size: 15px; line-height: 1.4; }
.hero { max-width: 1120px; margin: 0 auto; padding: 28px 20px 0; }
.hero img { width: 100%; height: auto; display: block; border-radius: 18px; aspect-ratio: 16 / 9; object-fit: cover; }
article { max-width: 760px; margin: 0 auto; padding: 8px 20px 40px; }
.kick { margin: 26px 0 0; font-size: 13.5px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--g2); }
h1 { margin: 10px 0 0; font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif; font-weight: 800; font-size: clamp(27px, 4.2vw, 40px); line-height: 1.2; letter-spacing: -.01em; }
.en-t { margin: 10px 0 0; font-size: 17px; font-style: italic; color: var(--mid); }
.meta { margin: 14px 0 0; font-size: 14px; color: var(--mid); }
.lead { margin: 22px 0 0; font-size: 19.5px; font-weight: 600; line-height: 1.6; }
article p { margin: 18px 0 0; }
article h2 { margin: 34px 0 0; font-family: 'Montserrat', sans-serif; font-size: 23px; line-height: 1.3; }
article ul { margin: 14px 0 0; padding-left: 22px; }
article li { margin: 10px 0 0; }
figure { margin: 26px 0 0; }
figure img { width: 100%; height: auto; display: block; border-radius: 12px; background: var(--tint); }
figure.pair div { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
figure.pair img { aspect-ratio: 3 / 2; object-fit: cover; }
figure.wall div { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
figure.wall img { aspect-ratio: 4 / 3; object-fit: cover; border-radius: 10px; }
figure.vid video { width: 100%; aspect-ratio: 16 / 9; display: block; border-radius: 12px; background: #06201a; }
figure.vid figcaption b { color: var(--ink); }
figcaption { margin-top: 8px; font-size: 14px; line-height: 1.5; color: var(--mid); }
.credit { margin: 26px 0 0; font-size: 14px; color: var(--mid); }
.en { margin: 40px 0 0; padding: 22px 24px 24px; background: var(--tint); border-radius: 16px; }
.en h2 { margin: 0; font-size: 19px; }
.en p { margin: 12px 0 0; font-size: 16.5px; }
.more { margin: 36px 0 0; display: grid; gap: 12px; }
.more a { display: grid; grid-template-columns: 120px 1fr; gap: 14px; align-items: center; text-decoration: none; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.more img { width: 120px; height: 80px; object-fit: cover; display: block; }
.more b { font-size: 15.5px; line-height: 1.4; padding-right: 12px; }
.gal { max-width: 1120px; margin: 0 auto; padding: 10px 20px 60px; }
.gal > h2 { font-family: 'Montserrat', sans-serif; font-size: 26px; margin: 10px 0 0; }
.gal > p { margin: 6px 0 0; color: var(--mid); font-size: 15px; }
.gal h3 { margin: 28px 0 10px; font-size: 17px; }
.gal h3 small { font-weight: 600; color: var(--mid); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 6px; }
.grid a { display: block; aspect-ratio: 3 / 2; overflow: hidden; border-radius: 8px; background: var(--tint); }
.grid img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .25s; }
.grid a:hover img { transform: scale(1.04); }
footer { background: var(--deep); color: #e9fbd8; }
footer .in { max-width: 1120px; margin: 0 auto; padding: 26px 20px; font-size: 14px; line-height: 1.6; }
footer a { color: #c4fba4; }
.lb { position: fixed; inset: 0; z-index: 100; background: rgba(6, 30, 24, .94); display: none; align-items: center; justify-content: center; }
.lb.on { display: flex; }
.lb.solo .p, .lb.solo .n { display: none; }
.lb img { max-width: 94vw; max-height: 84vh; object-fit: contain; border-radius: 6px; }
.lb button { position: absolute; border: 0; background: rgba(255,255,255,.14); color: #fff; width: 48px; height: 48px; border-radius: 50%; font-size: 30px; line-height: 1; cursor: pointer; }
.lb .x { top: 14px; right: 14px; } .lb .p { left: 14px; top: 50%; transform: translateY(-50%); } .lb .n { right: 14px; top: 50%; transform: translateY(-50%); }
.lb .c { position: absolute; left: 0; right: 0; bottom: 14px; text-align: center; color: #e9fbd8; font-size: 14px; padding: 0 70px; }
@media (max-width: 640px) { .ti-p { position: fixed; left: 12px; right: 12px; bottom: 16px; top: auto; transform: none; width: auto; font-size: 15px; } .pn { grid-template-columns: 1fr; } .pn .nx { text-align: left; } .rc { flex-basis: 78%; } body { font-size: 16.5px; } .top nav a.site { display: none; } .top .in { padding: 8px 12px; } .brand small { display: none; } .brand b { font-size: 14px; } .brand img { width: 32px; height: 32px; } .top nav a { padding: 6px 10px; font-size: 13.5px; } .hero { padding: 14px 12px 0; } .hero img { border-radius: 12px; } .grid { grid-template-columns: repeat(3, 1fr); gap: 4px; } .lb button { width: 40px; height: 40px; font-size: 24px; } }

/* chuỗi 2: bài không có ảnh sự kiện dùng logo làm ảnh đầu */
.hero.lg { display: flex; align-items: center; justify-content: center; background: #eef8f0; padding: 36px 20px; min-height: 0; }
.hero.lg img { max-height: 200px; max-width: min(560px, 80vw); width: auto; height: auto; object-fit: contain; }
.rc.lg img, .more a.lg img { object-fit: contain; background: #eef8f0; padding: 10px; box-sizing: border-box; }
.wall.cp div { align-items: start; } .wall.cp div figure { margin: 0; } .wall.cp div figcaption { margin-top: 6px; font-size: 13px; line-height: 1.45; }
.org { margin: 22px 0 0; padding: 14px 16px; border-left: 4px solid var(--g2); background: #f3fbf4; border-radius: 0 12px 12px 0; font-size: 15px; line-height: 1.55; color: var(--ink); }
/* chuỗi 2: khối chân dung người sáng lập */
.who { margin: 24px 0 0; display: grid; grid-template-columns: 168px 1fr; gap: 18px; align-items: center; padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: linear-gradient(135deg, #f3fbf4, #ffffff); }
.who img { width: 168px; height: 210px; object-fit: cover; border-radius: 14px; margin: 0; }
.who figcaption { margin: 0; font-size: 15px; color: var(--ink); }
.who b { display: block; font-family: 'Montserrat', sans-serif; font-size: 20px; color: var(--deep); }
.who span { display: block; margin-top: 4px; font-size: 13.5px; font-weight: 600; color: var(--g2); line-height: 1.45; }
.who q { display: block; margin-top: 10px; font-style: italic; font-size: 15.5px; line-height: 1.55; color: var(--mid); quotes: "“" "”"; }
.pt { margin-top: 18px; } .pt img { max-height: 520px; width: auto; max-width: 100%; margin: 0 auto; }
@media (max-width: 640px) { .who { grid-template-columns: 112px 1fr; gap: 12px; padding: 12px; } .who img { width: 112px; height: 140px; } .who b { font-size: 17px; } .who span { font-size: 12.5px; } .who q { font-size: 14.5px; } }

/* chuỗi 2b: chứng nhận tri ân trong bài */
.pt.cn img { max-height: none; width: 100%; max-width: 760px; border-radius: 10px; box-shadow: 0 6px 24px rgba(10, 60, 40, .16); }
.pt.cn figcaption { text-align: center; }

/* chuỗi 2c: khối sách và form đăng ký nhận sách */
.book { margin: 26px 0 8px; scroll-margin-top: 90px; }
.bk-card { display: grid; grid-template-columns: 230px 1fr; border-radius: 20px; overflow: hidden; border: 1px solid #f1d27a; background: #fff; box-shadow: 0 10px 30px rgba(120, 90, 10, .12); }
.bk-cover { display: flex; align-items: center; justify-content: center; padding: 22px 18px; background: #f9bd19; }
.bk-cover img { width: 100%; max-width: 190px; height: auto; margin: 0; filter: drop-shadow(0 10px 18px rgba(80, 50, 0, .35)); }
.bk-info { padding: 22px 24px; }
.bk-k { margin: 0; font-size: 12.5px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: #c0392b; }
.bk-info h3 { margin: 6px 0 4px; font-family: 'Montserrat', sans-serif; font-size: 26px; line-height: 1.2; color: var(--ink); }
.bk-s { margin: 0; font-size: 14.5px; font-style: italic; color: var(--mid); }
.bk-a { margin: 12px 0 0; font-size: 15.5px; }
.bk-info ul { margin: 10px 0 0; padding-left: 18px; font-size: 14.5px; line-height: 1.6; color: var(--mid); }
.bk-go { display: inline-block; margin-top: 14px; padding: 10px 18px; border-radius: 99px; background: #c0392b; color: #fff; font-weight: 800; font-size: 14.5px; text-decoration: none; }
.bk-go:hover { background: #a93226; }
.bk-form { margin-top: 16px; padding: 20px 22px; border: 1px solid var(--line); border-radius: 18px; background: linear-gradient(135deg, #fffbea, #ffffff); scroll-margin-top: 90px; }
.bk-form h3 { margin: 0; font-family: 'Montserrat', sans-serif; font-size: 21px; color: var(--deep); }
.bk-form > p { margin: 4px 0 0; font-size: 15px; color: var(--mid); }
.bk-g { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 14px; margin-top: 14px; }
.bk-g label span { display: block; font-size: 13.5px; font-weight: 700; color: var(--ink); margin-bottom: 4px; }
.bk-g label b { color: #c0392b; }
.bk-g input { width: 100%; box-sizing: border-box; padding: 11px 12px; border: 1.5px solid var(--line); border-radius: 12px; font: inherit; font-size: 16px; background: #fff; color: var(--ink); }
.bk-g input:focus { outline: none; border-color: var(--g2); box-shadow: 0 0 0 3px rgba(20, 154, 127, .15); }
.bk-g input.bad { border-color: #c0392b; background: #fff6f5; }
.bk-form .bk-h { margin-top: 8px; font-size: 13px; }
.bk-hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.bk-form button { margin-top: 14px; padding: 12px 22px; border: 0; border-radius: 99px; background: var(--deep); color: #fff; font: inherit; font-weight: 800; font-size: 15.5px; cursor: pointer; }
.bk-form button:hover { background: var(--g2); } .bk-form button:disabled { opacity: .6; cursor: wait; }
.bk-form .bk-st { margin-top: 10px; font-weight: 700; font-size: 15px; } .bk-st.ok { color: var(--g2); } .bk-st.err { color: #c0392b; }
.bk-form .bk-pv { margin-top: 6px; font-size: 12.5px; color: var(--mid); }
.bk-form.done .bk-g, .bk-form.done .bk-h, .bk-form.done button { display: none; }
.bk-ph { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px; }
.bk-ph figure { margin: 0; } .bk-ph img { width: 100%; aspect-ratio: 4 / 3; height: auto; object-fit: cover; border-radius: 12px; margin: 0; } .bk-ph img.top { object-position: top; }
.bk-ph figcaption { margin-top: 6px; font-size: 13px; line-height: 1.45; color: var(--mid); }
.bk-pc { margin: 6px 0 0; font-size: 12.5px; color: var(--mid); }
/* ảnh chèn giữa bài (::anh ...::) */
.ip { margin: 18px 0 22px; } .ip figure { margin: 0; } .ip img { width: 100%; height: auto; border-radius: 14px; margin: 0; }
.ip figcaption { margin-top: 6px; font-size: 13.5px; line-height: 1.45; color: var(--mid); }
.ip2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; } .ip2 img { aspect-ratio: 4 / 3; object-fit: cover; }
@media (max-width: 640px) { .bk-card { grid-template-columns: 1fr; } .bk-cover { padding: 20px; } .bk-cover img { max-width: 170px; } .bk-info { padding: 16px 18px 20px; } .bk-info h3 { font-size: 22px; }
  .bk-g { grid-template-columns: 1fr; } .bk-form { padding: 16px; } .bk-ph { grid-template-columns: 1fr 1fr; } .bk-ph figure:first-child { grid-column: 1 / -1; } }