/* Chưa Tài AI – giao diện web. Màu theo Bàn giao logo/NHAN-DIEN-LOGO-OUTRO.md */
:root {
  --tim: #6A42E1;
  --tim-dam: #4F2CB8;
  --tim-nhat: #C6B8FF;
  --hong-nhat: #F8C8E6;
  --kem: #F6F3EE;
  --kem-dam: #EDE8DF;
  --chu: #141225;
  --chu-phu: #5B5770;
  --den: #000000;
  --trang: #FFFFFF;
  --vien: rgba(20, 18, 37, 0.12);
  --bong: 0 1px 2px rgba(20, 18, 37, .05), 0 8px 30px rgba(20, 18, 37, .06);
  --bo: 18px;
  --rong: 1160px;
  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--kem);
  color: var(--chu);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  overflow-x: hidden;
}
img, svg, video, iframe { max-width: 100%; }
a { color: inherit; }
::selection { background: var(--tim-nhat); }

/* Nền: lưới chấm trôi nhẹ + vệt mờ tím/hồng */
.nen {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden;
}
.nen::before {
  content: ""; position: absolute; inset: -40px;
  background-image: radial-gradient(rgba(20, 18, 37, .13) 1px, transparent 1.4px);
  background-size: 26px 26px;
  animation: troi 60s linear infinite;
}
.vet {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: .55;
  animation: lo-lung 22s ease-in-out infinite alternate;
}
.vet-1 { width: 520px; height: 520px; background: var(--tim-nhat); top: -160px; right: -120px; }
.vet-2 { width: 440px; height: 440px; background: var(--hong-nhat); top: 40%; left: -180px; animation-delay: -8s; }
@keyframes troi { to { transform: translate(26px, 26px); } }
@keyframes lo-lung { to { transform: translate(-40px, 60px) scale(1.08); } }
@media (prefers-reduced-motion: reduce) {
  .nen::before, .vet { animation: none; }
  html { scroll-behavior: auto; }
  .hien { opacity: 1 !important; transform: none !important; }
}

.khung { width: 100%; max-width: var(--rong); margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .khung { padding: 0 16px; } }

/* Đầu trang */
.dau-trang {
  position: sticky; top: 0; z-index: 20;
  background: rgba(246, 243, 238, .82);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.dau-trang.cuon { border-bottom-color: var(--vien); }
.dau-trang .khung { display: flex; align-items: center; gap: 24px; height: 68px; }
.thuong-hieu { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.thuong-hieu svg { width: 42px; height: auto; display: block; }
.thuong-hieu span { font-weight: 800; font-style: italic; font-size: 19px; letter-spacing: -.01em; }
.menu { display: flex; gap: 4px; margin-left: auto; }
.menu a {
  text-decoration: none; font-size: 15px; font-weight: 500; color: var(--chu-phu);
  padding: 8px 14px; border-radius: 999px; transition: background .2s, color .2s;
}
.menu a:hover { color: var(--chu); background: rgba(20, 18, 37, .05); }
.menu a[aria-current="page"] { color: var(--chu); background: rgba(106, 66, 225, .1); }
.nut-menu { display: none; }

@media (max-width: 760px) {
  .dau-trang .khung { gap: 12px; height: 60px; }
  .dau-trang .nut-follow { display: none; }
  .nut-menu {
    display: grid; place-items: center; margin-left: auto;
    width: 42px; height: 42px; border-radius: 12px; border: 1px solid var(--vien);
    background: var(--trang); cursor: pointer; color: var(--chu);
  }
  .menu {
    position: absolute; top: 60px; left: 0; right: 0; margin: 0;
    flex-direction: column; gap: 0; padding: 8px 16px 16px;
    background: var(--kem); border-bottom: 1px solid var(--vien);
    display: none;
  }
  .menu.mo { display: flex; }
  .menu a { padding: 14px 8px; border-radius: 10px; font-size: 17px; }
  .menu .nut-follow-mobile { display: flex !important; margin-top: 8px; }
}
.nut-follow-mobile { display: none !important; }
.menu a.nut-chinh, .menu a.nut-chinh:hover { color: var(--trang); background: var(--chu); justify-content: center; }

/* Nút */
.nut {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font: inherit; font-weight: 600; font-size: 15px; line-height: 1;
  padding: 14px 22px; border-radius: 999px; text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: transform .2s, background .2s, box-shadow .2s, border-color .2s;
  white-space: nowrap;
}
.nut svg { width: 18px; height: 18px; flex-shrink: 0; }
.nut-chinh { background: var(--chu); color: var(--trang); }
.nut-chinh:hover { background: var(--tim); transform: translateY(-1px); box-shadow: 0 8px 24px rgba(106, 66, 225, .3); }
.nut-tim { background: var(--tim); color: var(--trang); }
.nut-tim:hover { background: var(--tim-dam); transform: translateY(-1px); }
.nut-phu { background: var(--trang); color: var(--chu); border-color: var(--vien); }
.nut-phu:hover { border-color: var(--chu); transform: translateY(-1px); }
.nut-nho { padding: 10px 16px; font-size: 14px; }
.nut:focus-visible, .menu a:focus-visible, .the:focus-visible { outline: 2px solid var(--tim); outline-offset: 3px; }

/* Chữ */
.nhan {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--tim);
}
.nhan::before { content: ""; width: 18px; height: 2px; background: currentColor; border-radius: 2px; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.025em; margin: 0; font-weight: 800; }
.tieu-de-muc { font-size: clamp(28px, 4vw, 42px); margin-top: 14px; }
.mo-ta-muc { color: var(--chu-phu); font-size: 18px; max-width: 620px; margin: 14px 0 0; }
.dau-muc { display: flex; justify-content: space-between; align-items: end; gap: 24px; flex-wrap: wrap; margin-bottom: 36px; }
.lien-ket-muc { font-weight: 600; font-size: 15px; color: var(--tim); text-decoration: none; display: inline-flex; gap: 6px; align-items: center; }
.lien-ket-muc:hover { text-decoration: underline; text-underline-offset: 4px; }

.muc { padding: 96px 0; }
@media (max-width: 640px) { .muc { padding: 64px 0; } }

/* Hero */
.hero { padding: 72px 0 88px; }
.hero .khung { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(40px, 6.4vw, 76px); margin-top: 18px; letter-spacing: -.035em; }
.hero h1 em { font-style: italic; color: var(--tim); }
.hero .loi-dan { font-size: clamp(18px, 2vw, 20px); color: var(--chu-phu); max-width: 540px; margin: 22px 0 0; }
.hang-nut { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.cam-ket { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 34px 0 0; padding: 0; list-style: none; font-size: 15px; color: var(--chu-phu); }
.cam-ket li { display: flex; align-items: center; gap: 8px; }
.cam-ket svg { width: 16px; height: 16px; color: var(--tim); flex-shrink: 0; }

.the-logo {
  position: relative; aspect-ratio: 1 / 1; border-radius: 28px;
  background: var(--trang); box-shadow: var(--bong); border: 1px solid var(--vien);
  display: grid; place-items: center; overflow: hidden;
}
.the-logo::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(106, 66, 225, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(106, 66, 225, .07) 1px, transparent 1px);
  background-size: calc(100% / 23) calc(100% / 23);
}
.the-logo .logo-lon { position: relative; width: calc(100% * 14 / 23); }
.the-logo .logo-lon .p { transform-box: fill-box; }
.the-logo .chu-the {
  position: absolute; left: 0; right: 0; bottom: 9%; text-align: center;
}
.the-logo .chu-the b { display: block; font-weight: 800; font-style: italic; font-size: clamp(18px, 2.4vw, 26px); letter-spacing: -.01em; }
.the-logo .chu-the span { font-size: clamp(12px, 1.3vw, 14px); color: var(--chu-phu); }
.the-logo .goc {
  position: absolute; top: 18px; left: 20px; font-size: 12px; font-weight: 600; letter-spacing: .06em;
  color: var(--chu-phu); text-transform: uppercase;
}

/* Logo ráp lần lượt như outro */
.logo-lon .p { opacity: 0; animation: rap .7s cubic-bezier(.2, .8, .2, 1) forwards; }
.logo-lon .p1 { --tu: translateX(-30%); animation-delay: .25s; }
.logo-lon .p2 { --tu: translateY(-40%); animation-delay: .4s; }
.logo-lon .p3 { --tu: translateX(30%); animation-delay: .1s; }
.logo-lon .p4 { --tu: translateY(30%); animation-delay: .55s; }
.logo-lon .p5 { --tu: scale(.2); animation-delay: .85s; transform-origin: center; }
.logo-lon .p6 { --tu: translateY(40%); animation-delay: .7s; }
@keyframes rap { from { opacity: 0; transform: var(--tu); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .logo-lon .p { animation: none; opacity: 1; } }

@media (max-width: 900px) {
  .hero { padding: 40px 0 64px; }
  .hero .khung { grid-template-columns: 1fr; gap: 40px; }
  .the-logo { max-width: 420px; width: 100%; margin: 0 auto; }
}

/* Thẻ chung */
.luoi { display: grid; gap: 20px; }
.luoi-3 { grid-template-columns: repeat(3, 1fr); }
.luoi-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) { .luoi-4 { grid-template-columns: repeat(2, 1fr); } .luoi-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .luoi-4, .luoi-3 { grid-template-columns: 1fr; } }

.the {
  position: relative; display: flex; flex-direction: column;
  background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo);
  padding: 26px; text-decoration: none; color: inherit;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
a.the:hover { transform: translateY(-3px); box-shadow: var(--bong); border-color: rgba(106, 66, 225, .35); }
.the h3 { font-size: 20px; letter-spacing: -.015em; }
.the p { color: var(--chu-phu); font-size: 15.5px; margin: 10px 0 0; }

/* Tuyến nội dung */
.the-tuyen .so { font-size: 13px; font-weight: 700; color: var(--tim); letter-spacing: .06em; }
.the-tuyen .bieu-tuong {
  width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center;
  background: rgba(106, 66, 225, .1); color: var(--tim); margin: 18px 0 20px;
}
.the-tuyen .bieu-tuong svg { width: 24px; height: 24px; }
.the-tuyen:nth-child(2) .bieu-tuong { background: rgba(248, 200, 230, .55); color: #B0377F; }
.the-tuyen:nth-child(4) .bieu-tuong { background: rgba(20, 18, 37, .07); color: var(--chu); }

/* Video TikTok */
.luoi-video { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: start; }
@media (max-width: 960px) { .luoi-video { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .luoi-video { grid-template-columns: 1fr; justify-items: center; } }
.luoi-video .tiktok-embed { margin: 0 !important; min-width: 0 !important; max-width: 340px !important; width: 100%; }
.video-trong {
  aspect-ratio: 9 / 14; border-radius: var(--bo); border: 1.5px dashed rgba(106, 66, 225, .35);
  background: rgba(255, 255, 255, .55); display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 28px; text-decoration: none; transition: background .2s, border-color .2s; width: 100%;
}
.video-trong:hover { background: var(--trang); border-color: var(--tim); }
.video-trong .vong {
  width: 64px; height: 64px; border-radius: 50%; background: var(--chu); color: var(--trang);
  display: grid; place-items: center; margin-bottom: 18px;
}
.video-trong .vong svg { width: 26px; height: 26px; margin-left: 3px; }
.video-trong b { font-size: 17px; }
.video-trong span { color: var(--chu-phu); font-size: 14.5px; margin-top: 6px; }
@media (max-width: 620px) { .video-trong { aspect-ratio: auto; min-height: 220px; } .luoi-video .video-trong:nth-child(n+2) { display: none; } }

/* Thẻ bài blog */
.the-bai .meta { display: flex; gap: 10px; align-items: center; font-size: 13.5px; color: var(--chu-phu); margin-bottom: 14px; flex-wrap: wrap; }
.the-bai h3 { font-size: 21px; line-height: 1.3; }
.the-bai p { flex: 1; }
.the-bai .doc { margin-top: 20px; font-weight: 600; font-size: 14.5px; color: var(--tim); }
.the {
  overflow-wrap: anywhere;
}
.chip {
  display: inline-flex; align-items: center; font-size: 12.5px; font-weight: 600;
  padding: 4px 10px; border-radius: 999px; background: rgba(106, 66, 225, .1); color: var(--tim-dam);
}
.chip-hong { background: rgba(248, 200, 230, .6); color: #8E2A66; }
.chip-den { background: rgba(20, 18, 37, .07); color: var(--chu); }
.chip-nhap { background: #FFE9A8; color: #6B4E00; }

/* Bài nổi bật trong trang blog */
.bai-dau { display: grid; grid-template-columns: 1fr 1fr; gap: 0; padding: 0; overflow: hidden; }
.bai-dau .bia {
  background: var(--chu); color: var(--trang); padding: 40px; display: flex; flex-direction: column; justify-content: space-between;
  min-height: 300px; position: relative; overflow: hidden;
}
.bai-dau .bia::after {
  content: ""; position: absolute; width: 320px; height: 320px; border-radius: 50%; right: -90px; bottom: -120px;
  background: var(--tim); filter: blur(60px); opacity: .7;
}
.bai-dau .bia .so-lon { font-size: 15px; font-weight: 600; opacity: .7; position: relative; z-index: 1; }
.bai-dau .bia .chu-bia { font-size: clamp(26px, 3.2vw, 36px); font-weight: 800; line-height: 1.15; letter-spacing: -.02em; position: relative; z-index: 1; }
.bai-dau .noi-dung-the { padding: 40px; display: flex; flex-direction: column; justify-content: center; }
.bai-dau h3 { font-size: clamp(22px, 2.4vw, 28px); line-height: 1.25; }
@media (max-width: 760px) {
  .bai-dau { grid-template-columns: 1fr; }
  .bai-dau .bia { min-height: 200px; padding: 28px; }
  .bai-dau .noi-dung-the { padding: 28px; }
}

/* Thư viện skill */
.the-skill .dong-tren { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 18px; }
.the-skill dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 18px 0 0; font-size: 14.5px; }
.the-skill dt { color: var(--chu-phu); }
.the-skill dd { margin: 0; font-weight: 500; }
.the-skill .hang-nut { margin-top: 24px; gap: 10px; }
.the-skill .hang-nut .nut { flex: 1; }
.nut[aria-disabled="true"] { opacity: .45; pointer-events: none; }

/* Mục lục 2 loại skill */
.muc-luc-skill { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.muc-luc-skill a {
  display: inline-flex; align-items: center; gap: 10px; padding: 10px 14px 10px 16px; border-radius: 999px;
  background: var(--trang); border: 1px solid var(--vien); text-decoration: none; font-weight: 600; font-size: 15px;
  transition: border-color .2s, transform .2s;
}
.muc-luc-skill a:hover { border-color: var(--tim); transform: translateY(-1px); }
.muc-luc-skill svg { width: 26px; height: auto; }
.muc-luc-skill a span {
  min-width: 26px; height: 26px; padding: 0 8px; border-radius: 999px; display: grid; place-items: center;
  background: rgba(106, 66, 225, .1); color: var(--tim-dam); font-size: 13px;
}
.nhom-skill { padding: 40px 0 56px; scroll-margin-top: 80px; }
.nhom-skill + .nhom-skill { border-top: 1px solid var(--vien); padding-top: 64px; }
.nhom-skill .dau-muc { margin-bottom: 28px; }

.the-skill .cac-chip { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.nhan-loai { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.nhan-loai svg { width: 28px; height: auto; }

/* Của kênh: thẻ trắng, viền tím trên cùng */
.the-cua-kenh { border-top: 4px solid var(--tim); padding-top: 22px; }
.the-cua-kenh .nhan-loai { color: var(--tim-dam); }

/* Sưu tầm: thẻ nhạt hơn, viền đứt, có dòng tác giả */
.the-suu-tam { background: rgba(255, 255, 255, .55); border-style: dashed; border-color: rgba(20, 18, 37, .22); }
.the-suu-tam .nhan-loai { color: var(--chu-phu); padding: 4px 10px; border: 1px solid var(--vien); border-radius: 999px; background: var(--trang); }
.tac-gia-skill { font-size: 14.5px; color: var(--chu-phu); margin-top: 4px; }
.tac-gia-skill a { color: var(--tim-dam); font-weight: 600; text-underline-offset: 3px; }

.the-goi-y {
  background: var(--chu); color: var(--trang); border-color: transparent;
}
.the-goi-y p { color: rgba(255, 255, 255, .72); }
.the-goi-y .nut-phu { background: transparent; color: var(--trang); border-color: rgba(255, 255, 255, .35); }
.the-goi-y .nut-phu:hover { border-color: var(--trang); }

/* Quyền lợi khi vào web */
.the-quyen-loi { padding: 28px 26px 24px; }
.the-quyen-loi .bieu-tuong {
  width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; margin-bottom: 22px;
  background: var(--tim); color: var(--trang); box-shadow: 0 8px 20px rgba(106, 66, 225, .25);
}
.the-quyen-loi:nth-child(2) .bieu-tuong { background: var(--hong-nhat); color: #8E2A66; box-shadow: 0 8px 20px rgba(248, 200, 230, .5); }
.the-quyen-loi:nth-child(3) .bieu-tuong { background: var(--chu); box-shadow: 0 8px 20px rgba(20, 18, 37, .2); }
.the-quyen-loi:nth-child(4) .bieu-tuong { background: var(--tim-nhat); color: var(--tim-dam); box-shadow: 0 8px 20px rgba(198, 184, 255, .5); }
.the-quyen-loi .bieu-tuong svg { width: 26px; height: 26px; }
.the-quyen-loi h3 { font-size: 19px; }
.the-quyen-loi p { flex: 1; }
.the-quyen-loi .dem {
  display: flex; align-items: center; gap: 6px; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--vien);
  font-size: 14px; color: var(--chu-phu);
}
.the-quyen-loi .dem b { color: var(--chu); font-weight: 800; }
.the-quyen-loi .mui { margin-left: auto; color: var(--tim); display: inline-flex; transition: transform .2s; }
.the-quyen-loi .mui svg { width: 18px; height: 18px; }
a.the-quyen-loi:hover .mui { transform: translateX(4px); }

/* Ô thư viện skill ở trang chủ */
.o-thu-vien { padding: 40px; display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: center; }
.o-thu-vien .nhan { color: var(--tim-nhat); }
.o-thu-vien .tieu-de-muc { font-size: clamp(24px, 3vw, 34px); }
.o-thu-vien p { font-size: 17px; max-width: 560px; }
.o-thu-vien .nut-chinh { background: var(--trang); color: var(--chu); }
.o-thu-vien .nut-chinh:hover { background: var(--tim-nhat); }
@media (max-width: 700px) {
  .o-thu-vien { grid-template-columns: 1fr; padding: 28px 24px; gap: 22px; }
  .o-thu-vien .nut { justify-self: start; }
}

/* Về kênh */
.ve-kenh { display: grid; grid-template-columns: .9fr 1.1fr; gap: 64px; align-items: start; }
.ve-kenh .trich { font-size: clamp(24px, 3vw, 34px); font-weight: 700; line-height: 1.3; letter-spacing: -.02em; margin: 18px 0 0; }
.ve-kenh .trich em { color: var(--tim); font-style: italic; }
.nguyen-tac { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; border-top: 1px solid var(--vien); }
.nguyen-tac li { display: grid; grid-template-columns: 48px 1fr; gap: 12px; padding: 22px 0; border-bottom: 1px solid var(--vien); }
.nguyen-tac .so { font-weight: 800; font-style: italic; color: var(--tim); font-size: 18px; }
.nguyen-tac b { display: block; font-size: 17.5px; }
.nguyen-tac span { color: var(--chu-phu); font-size: 15.5px; }
@media (max-width: 860px) { .ve-kenh { grid-template-columns: 1fr; gap: 32px; } }

/* Dải kêu gọi */
.dai-cta {
  position: relative; overflow: hidden; border-radius: 28px; background: var(--tim); color: var(--trang);
  padding: 64px 56px; display: grid; grid-template-columns: 1.3fr .7fr; gap: 32px; align-items: center;
}
.dai-cta::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, .18) 1px, transparent 1.4px); background-size: 22px 22px;
}
.dai-cta::after {
  content: ""; position: absolute; width: 420px; height: 420px; right: -120px; top: -160px; border-radius: 50%;
  background: var(--hong-nhat); filter: blur(90px); opacity: .55;
}
.dai-cta > * { position: relative; z-index: 1; }
.dai-cta h2 { font-size: clamp(30px, 4.2vw, 48px); }
.dai-cta p { margin: 14px 0 0; font-size: 18px; color: rgba(255, 255, 255, .85); max-width: 520px; }
.dai-cta .hang-nut { margin: 0; justify-content: flex-end; }
.dai-cta .nut-chinh { background: var(--trang); color: var(--chu); }
.dai-cta .nut-chinh:hover { background: var(--chu); color: var(--trang); }
.dai-cta .nut-phu { background: transparent; color: var(--trang); border-color: rgba(255, 255, 255, .5); }
.dai-cta .nut-phu:hover { border-color: var(--trang); }
@media (max-width: 860px) {
  .dai-cta { grid-template-columns: 1fr; padding: 44px 24px; border-radius: 22px; }
  .dai-cta .hang-nut { justify-content: flex-start; }
}

/* Chân trang */
.chan-trang { padding: 56px 0 40px; border-top: 1px solid var(--vien); margin-top: 96px; }
.chan-trang .khung { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.chan-trang .thuong-hieu svg { width: 54px; }
.chan-trang .khau-hieu { color: var(--chu-phu); margin: 14px 0 0; font-size: 15px; }
.chan-trang h4 { margin: 0 0 14px; font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--chu-phu); }
.chan-trang ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; font-size: 15px; }
.chan-trang ul a { text-decoration: none; }
.chan-trang ul a:hover { color: var(--tim); }
.chan-trang .dong-cuoi {
  grid-column: 1 / -1; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  border-top: 1px solid var(--vien); padding-top: 24px; font-size: 13.5px; color: var(--chu-phu);
}
@media (max-width: 760px) { .chan-trang .khung { grid-template-columns: 1fr 1fr; } .chan-trang .cot-dau { grid-column: 1 / -1; } }

/* Đầu trang con */
.dau-trang-con { padding: 64px 0 40px; }
.dau-trang-con h1 { font-size: clamp(36px, 5.4vw, 60px); margin-top: 16px; letter-spacing: -.03em; }
.dau-trang-con p { font-size: 19px; color: var(--chu-phu); max-width: 640px; margin: 18px 0 0; }
@media (max-width: 640px) { .dau-trang-con { padding: 40px 0 28px; } }

.loc { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 28px; }
.loc button {
  font: inherit; font-size: 14.5px; font-weight: 500; padding: 9px 16px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--vien); background: var(--trang); color: var(--chu-phu); transition: all .2s;
}
.loc button:hover { color: var(--chu); border-color: var(--chu); }
.loc button[aria-pressed="true"] { background: var(--chu); color: var(--trang); border-color: var(--chu); }

/* Bài viết */
.bai-viet { padding: 40px 0 0; }
.duong-dan { font-size: 14px; color: var(--chu-phu); display: flex; gap: 8px; flex-wrap: wrap; }
.duong-dan a { text-decoration: none; }
.duong-dan a:hover { color: var(--tim); }
.bai-viet header { max-width: 760px; margin: 28px auto 0; }
.bai-viet header h1 { font-size: clamp(32px, 4.8vw, 52px); letter-spacing: -.03em; line-height: 1.12; margin-top: 18px; }
.bai-viet .sapo { font-size: 20px; color: var(--chu-phu); margin: 20px 0 0; line-height: 1.55; }
.bai-viet .meta-bai { display: flex; gap: 10px 18px; flex-wrap: wrap; align-items: center; margin-top: 26px; padding-bottom: 28px; border-bottom: 1px solid var(--vien); font-size: 14.5px; color: var(--chu-phu); }
.bai-viet .meta-bai .tac-gia { display: flex; align-items: center; gap: 10px; color: var(--chu); font-weight: 600; }
.bai-viet .meta-bai .tac-gia svg { width: 34px; }

.noi-dung { max-width: 720px; margin: 36px auto 0; font-size: 18px; line-height: 1.75; }
.noi-dung > * + * { margin-top: 1.1em; }
.noi-dung h2 { font-size: 27px; margin-top: 2em; letter-spacing: -.02em; }
.noi-dung h3 { font-size: 21px; margin-top: 1.7em; }
.noi-dung p, .noi-dung ul, .noi-dung ol { margin-bottom: 0; }
.noi-dung ul, .noi-dung ol { padding-left: 1.3em; }
.noi-dung li + li { margin-top: .45em; }
.noi-dung li::marker { color: var(--tim); font-weight: 700; }
.noi-dung a { color: var(--tim-dam); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.noi-dung a:hover { color: var(--tim); }
.noi-dung strong { font-weight: 700; }
.noi-dung code {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: .86em;
  background: rgba(106, 66, 225, .09); color: var(--tim-dam); padding: .15em .4em; border-radius: 6px; overflow-wrap: anywhere;
}
.noi-dung pre {
  background: var(--chu); color: #EDEAF7; padding: 20px 22px; border-radius: 14px; overflow-x: auto; font-size: 15px; line-height: 1.6;
}
.noi-dung pre code { background: none; color: inherit; padding: 0; font-size: inherit; }
.noi-dung blockquote {
  margin-left: 0; margin-right: 0; padding: 18px 22px; border-radius: 14px;
  background: rgba(198, 184, 255, .3); border-left: 4px solid var(--tim);
}
.noi-dung blockquote p { margin: 0; }
.noi-dung hr { border: 0; border-top: 1px solid var(--vien); margin: 2.4em 0; }

.hop-nguon { max-width: 720px; margin: 48px auto 0; padding: 24px 26px; background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); }
.hop-nguon h2 { font-size: 15px; text-transform: uppercase; letter-spacing: .08em; color: var(--chu-phu); }
.hop-nguon ul { margin: 14px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; font-size: 15.5px; }
.hop-nguon a { color: var(--tim-dam); text-underline-offset: 3px; overflow-wrap: anywhere; }

.hop-tiktok {
  max-width: 720px; margin: 28px auto 0; padding: 28px; border-radius: 22px; background: var(--chu); color: var(--trang);
  display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: center; position: relative; overflow: hidden;
}
.hop-tiktok::after { content: ""; position: absolute; width: 260px; height: 260px; border-radius: 50%; right: -80px; top: -100px; background: var(--tim); filter: blur(70px); opacity: .6; }
.hop-tiktok > * { position: relative; z-index: 1; }
.hop-tiktok .logo-nho { width: 64px; height: 64px; border-radius: 18px; background: var(--kem); display: grid; place-items: center; }
.hop-tiktok .logo-nho svg { width: 42px; }
.hop-tiktok b { font-size: 19px; display: block; }
.hop-tiktok p { margin: 4px 0 0; color: rgba(255, 255, 255, .75); font-size: 15.5px; }
.hop-tiktok .hang-nut { grid-column: 1 / -1; margin: 0; }
.hop-tiktok .nut-chinh { background: var(--trang); color: var(--chu); }
.hop-tiktok .nut-chinh:hover { background: var(--tim-nhat); }
.hop-tiktok .nut-phu { background: transparent; color: var(--trang); border-color: rgba(255, 255, 255, .4); }
@media (max-width: 560px) { .hop-tiktok { grid-template-columns: 1fr; padding: 24px; } }

.video-bai { max-width: 720px; margin: 36px auto 0; display: flex; justify-content: center; }

.banner-nhap {
  background: #FFE9A8; color: #4A3600; font-size: 14.5px; text-align: center; padding: 10px 16px; font-weight: 500;
}

.lien-quan { margin-top: 80px; }

/* Hiện dần khi cuộn */
.hien { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s cubic-bezier(.2, .8, .2, 1); }
.hien.da-hien { opacity: 1; transform: none; }
.khong-js .hien { opacity: 1; transform: none; }

.trong { text-align: center; padding: 60px 20px; color: var(--chu-phu); border: 1.5px dashed var(--vien); border-radius: var(--bo); }
.an { display: none !important; }

/* Nút Follow luôn hiện trên đầu trang điện thoại */
.nut-tiktok-dt { display: none; }
@media (max-width: 760px) {
  .nut-tiktok-dt {
    display: inline-flex; align-items: center; gap: 6px; margin-left: auto;
    height: 40px; padding: 0 14px; border-radius: 999px; background: var(--chu); color: var(--trang);
    font-weight: 600; font-size: 14px; text-decoration: none;
  }
  .nut-tiktok-dt svg { width: 16px; height: 16px; }
  .dau-trang .nut-menu { margin-left: 0; }
}
@media (max-width: 360px) { .thuong-hieu span { display: none; } }

/* Số follower */
.so-follow { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 6px; margin: 20px 0 0; font-size: 15px; color: var(--chu-phu); }
.so-follow b { color: var(--chu); font-weight: 800; }
.so-follow .ngay-cn { font-size: 13.5px; opacity: .8; white-space: nowrap; }
.cham-song { width: 8px; height: 8px; border-radius: 50%; background: #22B573; margin-right: 4px; box-shadow: 0 0 0 0 rgba(34, 181, 115, .5); animation: song 2.4s ease-out infinite; }
@keyframes song { 70% { box-shadow: 0 0 0 7px rgba(34, 181, 115, 0); } 100% { box-shadow: 0 0 0 0 rgba(34, 181, 115, 0); } }
.so-follow.tren-tim { color: rgba(255, 255, 255, .8); margin-top: 18px; }
.so-follow.tren-tim b { color: var(--trang); }
@media (prefers-reduced-motion: reduce) { .cham-song { animation: none; } }

/* Dải video khi chưa có video nổi bật */
.dai-video {
  display: grid; grid-template-columns: auto 1fr auto; gap: 22px; align-items: center;
  padding: 24px 28px; border-radius: var(--bo); background: var(--trang); border: 1px solid var(--vien);
  text-decoration: none; transition: border-color .2s, box-shadow .2s, transform .2s;
}
.dai-video:hover { border-color: rgba(106, 66, 225, .35); box-shadow: var(--bong); transform: translateY(-2px); }
.dai-video .vong { width: 56px; height: 56px; border-radius: 50%; background: var(--tim); color: var(--trang); display: grid; place-items: center; }
.dai-video .vong svg { width: 22px; height: 22px; margin-left: 3px; }
.dai-video .chu b { display: block; font-size: 18px; }
.dai-video .chu span { color: var(--chu-phu); font-size: 15px; }
@media (max-width: 620px) {
  .dai-video { grid-template-columns: auto 1fr; padding: 20px; gap: 16px; }
  .dai-video .nut { grid-column: 1 / -1; justify-self: start; }
}

/* Ảnh bìa bài */
.bia-bai {
  position: relative; overflow: hidden; aspect-ratio: 1200 / 630; container-type: inline-size;
  background: var(--tim); color: var(--trang); isolation: isolate;
}
.bia-trong {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between;
  padding: 6cqw 6.5cqw; text-align: left;
}
.bia-bai::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background-image: radial-gradient(rgba(255, 255, 255, .22) 1px, transparent 1.4px); background-size: 4.4cqw 4.4cqw;
}
.bia-bai::after {
  content: ""; position: absolute; z-index: -1; width: 70cqw; height: 70cqw; right: -22cqw; top: -30cqw; border-radius: 50%;
  background: var(--hong-nhat); filter: blur(9cqw); opacity: .6;
}
.bia-tuyen { display: inline-flex; align-items: center; gap: 1.6cqw; font-size: max(11px, 4.2cqw); font-weight: 700; letter-spacing: .02em; }
.bia-tuyen svg { width: 1.3em; height: 1.3em; }
.bia-chu { font-size: 15cqw; font-weight: 800; font-style: italic; line-height: .95; letter-spacing: -.035em; margin-top: auto; }
.bia-chu.dai { font-size: 9.5cqw; }
.bia-chu.rat-dai { font-size: 7.5cqw; white-space: normal; }
.bia-chu { white-space: nowrap; }
.bia-logo {
  position: absolute; right: 5cqw; bottom: 5cqw; width: 15cqw; aspect-ratio: 1; border-radius: 3.6cqw;
  background: var(--kem); display: grid; place-items: center;
}
.bia-logo svg { width: 72%; height: auto; }
.bia-bai .bia-chu { padding-right: 18cqw; }
.bia-xoa-mu { background: var(--hong-nhat); color: var(--chu); }
.bia-xoa-mu::before { background-image: radial-gradient(rgba(20, 18, 37, .16) 1px, transparent 1.4px); }
.bia-xoa-mu::after { background: var(--tim-nhat); }
.bia-huong-dan { background: var(--chu); }
.bia-huong-dan::after { background: var(--tim); opacity: .8; }
.bia-huong-dan .bia-chu { color: var(--tim-nhat); }
.bia-xep-hang { background: var(--tim-nhat); color: var(--chu); }
.bia-xep-hang::before { background-image: radial-gradient(rgba(20, 18, 37, .14) 1px, transparent 1.4px); }

.the-bai { overflow: hidden; }
.the-bai > .bia-bai { margin: -26px -26px 22px; transition: transform .5s cubic-bezier(.2, .8, .2, 1); }
a.the-bai:hover > .bia-bai .bia-chu { transform: translateX(4px); }
.bia-chu { transition: transform .4s cubic-bezier(.2, .8, .2, 1); }

/* Bài nổi bật trang blog dùng ảnh bìa */
.bai-dau .bia { padding: 0; min-height: 320px; background: none; display: block; position: relative; }
.bai-dau .bia::after { display: none; }
.bai-dau .bia .bia-bai { position: absolute; inset: 0; aspect-ratio: auto; }
@media (max-width: 760px) { .bai-dau .bia { min-height: 0; aspect-ratio: 1200 / 630; } }
.bai-dau .bia .so-lon {
  position: absolute; right: 20px; top: 20px; z-index: 2; font-size: 13px; font-weight: 600; opacity: 1;
  background: rgba(20, 18, 37, .75); color: var(--trang); padding: 6px 12px; border-radius: 999px;
}

/* Ảnh bìa đầu bài viết */
.bia-dau-bai { max-width: 760px; margin: 32px auto 0; }
.bia-dau-bai .bia-bai { border-radius: 22px; }

/* Dòng mời giữa bài */
.noi-dung .moi-giua {
  display: flex; gap: 12px; align-items: center; margin: 2em 0 0; padding: 14px 18px;
  border-radius: 14px; background: var(--trang); border: 1px solid var(--vien); font-size: 16px; color: var(--chu-phu);
}
.noi-dung .moi-giua svg { width: 20px; height: 20px; flex-shrink: 0; color: var(--chu); }
.noi-dung .moi-giua a { font-weight: 600; }

/* Thanh tiến độ đọc */
.tien-do { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 40; pointer-events: none; }
.tien-do span { display: block; height: 100%; background: linear-gradient(90deg, var(--tim), #B57BE8); transform: scaleX(0); transform-origin: 0 50%; }


/* ---------- Hướng dẫn cài từng bước ---------- */
.an-mat { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.nhay-cai-dat {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 18px; padding: 10px 16px; border-radius: 999px;
  background: rgba(106, 66, 225, .1); color: var(--tim-dam); font-weight: 600; font-size: 15px; text-decoration: none;
  transition: background .2s;
}
.nhay-cai-dat:hover { background: rgba(106, 66, 225, .18); }
.nhay-cai-dat svg { width: 18px; height: 18px; }

.noi-dung .huong-dan {
  margin: 2.4em -28px 0; padding: 32px 28px 28px; border-radius: 24px;
  background: var(--trang); border: 1px solid var(--vien); box-shadow: var(--bong); scroll-margin-top: 84px;
}
@media (max-width: 760px) { .noi-dung .huong-dan { margin-left: 0; margin-right: 0; padding: 24px 18px 20px; border-radius: 20px; } }
.huong-dan .hd-tieu-de { font-size: clamp(24px, 3vw, 30px); margin: 10px 0 0; letter-spacing: -.02em; }
.hd-tien-do { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 14px; font-size: 14.5px; color: var(--chu-phu); }
.hd-dem b { color: var(--chu); }
.hd-thanh { flex: 1; min-width: 120px; height: 6px; border-radius: 99px; background: rgba(106, 66, 225, .12); overflow: hidden; }
.hd-thanh span { display: block; height: 100%; width: 0; background: var(--tim); border-radius: 99px; transition: width .4s cubic-bezier(.2, .8, .2, 1); }

.hd-chuan-bi { margin-top: 24px; padding: 18px 20px; border-radius: 16px; background: var(--kem); }
.hd-chuan-bi .hd-nhan { display: block; font-size: 13px; letter-spacing: .06em; text-transform: uppercase; color: var(--chu-phu); }
.noi-dung .hd-chuan-bi ul { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 6px; }
.noi-dung .hd-chuan-bi li { position: relative; padding-left: 28px; margin: 0; }
.noi-dung .hd-chuan-bi li::before {
  content: ""; position: absolute; left: 0; top: .32em; width: 18px; height: 18px; border-radius: 6px;
  background: var(--tim) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5 12.5 4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / 12px no-repeat;
}

.noi-dung .hd-cac-buoc { list-style: none; padding: 0; margin: 28px 0 0; counter-reset: none; }
.noi-dung .hd-buoc { position: relative; display: grid; grid-template-columns: 44px 1fr; gap: 16px; margin: 0; padding-bottom: 28px; }
.noi-dung .hd-buoc + .hd-buoc { margin-top: 0; }
.hd-buoc::before { content: ""; position: absolute; left: 21px; top: 48px; bottom: 6px; width: 2px; background: var(--vien); border-radius: 2px; }
.hd-buoc:last-child { padding-bottom: 4px; }
.hd-buoc:last-child::before { display: none; }
.hd-so {
  width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; position: relative; z-index: 1;
  background: var(--chu); color: var(--trang); font-weight: 800; font-size: 17px; transition: background .25s, transform .25s;
}
.hd-so svg { display: none; width: 22px; height: 22px; }
.hd-than { min-width: 0; padding-top: 8px; }
.noi-dung .hd-than > * + * { margin-top: .8em; }
.huong-dan .hd-ten-buoc { font-size: 19px; margin: 0; line-height: 1.35; letter-spacing: -.01em; }
.noi-dung .hd-than p { margin-bottom: 0; }
.hd-xong {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 16px !important; padding: 8px 14px; border-radius: 999px;
  font: inherit; font-size: 14px; font-weight: 600; cursor: pointer; color: var(--chu-phu);
  background: var(--trang); border: 1.5px dashed rgba(20, 18, 37, .25); transition: all .2s;
}
.hd-xong svg { width: 16px; height: 16px; opacity: .35; }
.hd-xong:hover { border-color: var(--tim); color: var(--tim-dam); }
.hd-xong:focus-visible { outline: 2px solid var(--tim); outline-offset: 2px; }
.hd-buoc.da-xong .hd-so { background: #22B573; }
.hd-buoc.da-xong .hd-so-chu { display: none; }
.hd-buoc.da-xong .hd-so svg { display: block; }
.hd-buoc.da-xong::before { background: #22B573; opacity: .4; }
.hd-buoc.da-xong .hd-xong { border-style: solid; border-color: #22B573; background: rgba(34, 181, 115, .1); color: #137a4c; }
.hd-buoc.da-xong .hd-xong svg { opacity: 1; }
.hd-buoc.da-xong .hd-than > :not(.hd-ten-buoc):not(.hd-xong) { opacity: .6; }

.hd-loi { margin-top: 18px; border: 1px solid var(--vien); border-radius: 14px; background: var(--kem); }
.hd-loi summary { cursor: pointer; padding: 14px 18px; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 10px; }
.hd-loi summary::-webkit-details-marker { display: none; }
.hd-loi summary::before { content: "+"; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--chu); color: var(--trang); font-size: 15px; line-height: 1; flex-shrink: 0; }
.hd-loi[open] summary::before { content: "−"; }
.hd-loi > div { padding: 0 18px 16px; }
.noi-dung .hd-loi > div > * + * { margin-top: .8em; }

.hd-xong-het {
  margin-top: 22px; padding: 22px; border-radius: 18px; text-align: center;
  background: linear-gradient(135deg, rgba(34, 181, 115, .12), rgba(106, 66, 225, .1));
}
.hd-xong-het b { font-size: 19px; display: block; }
.noi-dung .hd-xong-het p { margin: 6px 0 14px; color: var(--chu-phu); }
.noi-dung .hd-xong-het a { color: var(--trang); text-decoration: none; }

.hd-thieu { margin-top: 2em; padding: 16px 18px; border-radius: 14px; background: #FFE9A8; color: #4A3600; font-size: 15px; border: 1.5px dashed #C9A227; }

/* Nút chép lệnh: thanh nhỏ phía trên khối code */
.khoi-lenh { border-radius: 14px; overflow: hidden; background: var(--chu); }
.thanh-lenh {
  display: flex; align-items: center; justify-content: space-between; padding: 8px 10px 8px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, .1); font-size: 12.5px; color: rgba(237, 234, 247, .6); font-weight: 600; letter-spacing: .04em;
}
.nut-chep {
  font: inherit; font-size: 12.5px; font-weight: 600; cursor: pointer; letter-spacing: 0;
  padding: 5px 12px; border-radius: 8px; border: 1px solid rgba(255, 255, 255, .25); background: rgba(255, 255, 255, .08); color: #EDEAF7;
  transition: background .2s;
}
.nut-chep:hover { background: rgba(255, 255, 255, .18); }
.nut-chep.da-chep { background: #22B573; border-color: #22B573; color: #fff; }
.noi-dung .khoi-lenh pre { margin: 0; border-radius: 0; }
@media (max-width: 760px) {
  .noi-dung .hd-buoc { grid-template-columns: 34px 1fr; gap: 12px; }
  .hd-so { width: 34px; height: 34px; font-size: 15px; }
  .hd-buoc::before { left: 16px; top: 38px; }
  .hd-than { padding-top: 4px; }
  .noi-dung pre { font-size: 13.5px; padding: 16px; }
}

/* Trang riêng của skill */
.ten-skill { text-decoration: none; }
.ten-skill:hover { color: var(--tim); }
.the-thong-tin { margin-top: 24px; padding: 22px 24px; border-radius: var(--bo); background: var(--trang); border: 1px solid var(--vien); }
.the-thong-tin dl { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; margin: 0; font-size: 15.5px; }
.the-thong-tin dt { color: var(--chu-phu); }
.the-thong-tin dd { margin: 0; font-weight: 500; }
.the-thong-tin .hang-nut { margin-top: 20px; }
.trang-skill header { padding-bottom: 8px; }


/* ---------- Trang chủ: thẻ "mới nhất" ở hero ---------- */
.the-moi {
  display: block; border-radius: 28px; overflow: hidden; background: var(--trang); border: 1px solid var(--vien);
  box-shadow: var(--bong); text-decoration: none; transition: transform .3s cubic-bezier(.2, .8, .2, 1), box-shadow .3s;
}
.the-moi:hover { transform: translateY(-4px) rotate(-.3deg); box-shadow: 0 2px 4px rgba(20, 18, 37, .05), 0 18px 50px rgba(106, 66, 225, .18); }
.the-moi-than { display: flex; flex-direction: column; gap: 10px; padding: 24px 26px 26px; }
.the-moi .nhan-nho { font-size: 13px; font-weight: 600; color: var(--chu-phu); letter-spacing: .02em; }
.the-moi b { font-size: clamp(20px, 2.2vw, 25px); line-height: 1.3; letter-spacing: -.015em; }
.the-moi .doc { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 15px; color: var(--tim); }
.the-moi .doc svg { width: 16px; height: 16px; transition: transform .2s; }
.the-moi:hover .doc svg { transform: translateX(4px); }
@media (max-width: 900px) { .the-moi { max-width: 520px; width: 100%; margin: 0 auto; } }

/* Danh sách câu hỏi gợi tò mò */
.ds-cau-hoi { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--vien); }
.ds-cau-hoi li { border-bottom: 1px solid var(--vien); }
.ds-cau-hoi a {
  display: grid; grid-template-columns: 56px 1fr auto; gap: 18px; align-items: center; padding: 24px 8px;
  text-decoration: none; transition: background .2s, padding .25s;
}
.ds-cau-hoi a:hover { background: rgba(255, 255, 255, .7); padding-left: 16px; padding-right: 16px; }
.ds-cau-hoi .so { font-weight: 800; font-style: italic; font-size: 20px; color: var(--tim); }
.ds-cau-hoi b { display: block; font-size: clamp(19px, 2.2vw, 24px); line-height: 1.3; letter-spacing: -.015em; }
.ds-cau-hoi .meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 8px; font-size: 14px; color: var(--chu-phu); }
.ds-cau-hoi .mui {
  width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center;
  border: 1px solid var(--vien); background: var(--trang); color: var(--chu); transition: background .2s, color .2s, transform .2s;
}
.ds-cau-hoi .mui svg { width: 18px; height: 18px; }
.ds-cau-hoi a:hover .mui { background: var(--tim); color: var(--trang); border-color: var(--tim); transform: translateX(4px); }
@media (max-width: 620px) {
  .ds-cau-hoi a { grid-template-columns: 36px 1fr; gap: 12px; padding: 20px 4px; }
  .ds-cau-hoi .mui { display: none; }
  .ds-cau-hoi .so { font-size: 17px; }
}

/* Hợp tác */
.hop-tac {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center;
  padding: 48px; border-radius: 28px; background: var(--trang); border: 1px solid var(--vien); position: relative; overflow: hidden;
}
.hop-tac::after {
  content: ""; position: absolute; width: 360px; height: 360px; left: -140px; bottom: -200px; border-radius: 50%;
  background: var(--hong-nhat); filter: blur(80px); opacity: .55; pointer-events: none;
}
.hop-tac > * { position: relative; z-index: 1; }
.hinh-thuc { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.hinh-thuc li { display: flex; gap: 12px; align-items: flex-start; font-weight: 500; }
.hinh-thuc svg { width: 22px; height: 22px; flex-shrink: 0; padding: 4px; border-radius: 7px; background: var(--tim); color: var(--trang); margin-top: 1px; }
.hop-tac .hang-nut { margin-top: 26px; }
.email-chu { margin: 14px 0 0; font-size: 14.5px; color: var(--chu-phu); }
.email-chu b { color: var(--chu); user-select: all; }
@media (max-width: 860px) { .hop-tac { grid-template-columns: 1fr; gap: 28px; padding: 32px 22px; border-radius: 22px; } }


/* ---------- Nhấn "miễn phí" ---------- */
.dong-nhan { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; }
.huy-hieu-free {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px 5px 8px; border-radius: 999px;
  background: #DDF5E9; color: #0F6B42; font-size: 13px; font-weight: 700; letter-spacing: .02em;
  box-shadow: inset 0 0 0 1px rgba(15, 107, 66, .15);
}
.huy-hieu-free svg { width: 16px; height: 16px; padding: 2px; border-radius: 50%; background: #22B573; color: #fff; }
.nhan-free { color: #0F6B42; font-weight: 700; background: linear-gradient(transparent 62%, #C9F0DC 62%); }
.cam-ket .la-free { color: #0F6B42; font-weight: 600; }
.cam-ket .la-free svg { color: #22B573; }
.chip-free { background: #DDF5E9; color: #0F6B42; }

/* Hợp tác & dịch vụ: 2 thẻ */
.luoi-hop-tac { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 860px) { .luoi-hop-tac { grid-template-columns: 1fr; } }
.the-ht {
  position: relative; overflow: hidden; display: flex; flex-direction: column; padding: 34px 32px 30px; border-radius: 26px;
  background: var(--trang); border: 1px solid var(--vien);
}
.the-ht > * { position: relative; z-index: 1; }
.the-ht .cho-ai { font-size: 13px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--tim); }
.the-ht h3 { font-size: clamp(22px, 2.4vw, 28px); margin-top: 10px; letter-spacing: -.02em; }
.the-ht p { color: var(--chu-phu); margin: 12px 0 22px; }
.the-ht .hinh-thuc { margin-bottom: 4px; }
.the-ht .hang-nut { margin-top: auto; padding-top: 26px; }
.the-dich-vu { background: var(--chu); color: var(--trang); border-color: transparent; }
.the-dich-vu::after {
  content: ""; position: absolute; width: 380px; height: 380px; right: -140px; top: -180px; border-radius: 50%;
  background: var(--tim); filter: blur(80px); opacity: .75;
}
.the-dich-vu .cho-ai { color: var(--tim-nhat); }
.the-dich-vu p { color: rgba(255, 255, 255, .75); }
.the-dich-vu .hinh-thuc svg { background: var(--tim-nhat); color: var(--chu); }
.the-dich-vu .nut-chinh { background: var(--trang); color: var(--chu); }
.the-dich-vu .nut-chinh:hover { background: var(--tim-nhat); }
.the-hop-tac::after {
  content: ""; position: absolute; width: 340px; height: 340px; left: -140px; bottom: -200px; border-radius: 50%;
  background: var(--hong-nhat); filter: blur(80px); opacity: .55;
}
#hop-tac .dau-muc .so-follow { margin: 0; align-self: end; }
#hop-tac .email-chu { text-align: center; margin-top: 18px; }
#hop-tac .email-chu a { color: var(--tim-dam); }


/* ---------- Bộ nút skill dùng chung ---------- */
.nut-skill { display: grid; grid-template-columns: 1fr; gap: 8px; margin-top: 22px; }
.nut-skill .nut { white-space: nowrap; text-align: center; line-height: 1.25; }
.nut-skill > .nut-chinh { grid-column: 1 / -1; }
.nut-skill > .nut:last-child:nth-child(2) { grid-column: 1 / -1; }
.the-skill { overflow-wrap: normal; }
.the-skill dl { margin-bottom: 4px; }
.the-skill .nut-skill { margin-top: auto; padding-top: 22px; }
.the-skill .hang-nut .nut { flex: initial; }
.the-thong-tin .nut-skill { grid-template-columns: repeat(3, auto); justify-content: start; }
.the-thong-tin .nut-skill > .nut-chinh { grid-column: auto; }
@media (max-width: 700px) {
  .the-thong-tin .nut-skill { grid-template-columns: 1fr 1fr; }
  .the-thong-tin .nut-skill > .nut-chinh { grid-column: 1 / -1; }
}

/* Thẻ bài: link chính + dải skill bên dưới (không lồng link) */
.the-bai .lien-the { display: flex; flex-direction: column; flex: 1; text-decoration: none; color: inherit; }
.the-bai > .lien-the > .bia-bai { margin: -26px -26px 22px; }
.the-bai .lien-the p { flex: 1; }
div.the-bai { transition: transform .25s, box-shadow .25s, border-color .25s; }
div.the-bai:has(.lien-the:hover) { transform: translateY(-3px); box-shadow: var(--bong); border-color: rgba(106, 66, 225, .35); }
div.the-bai:has(.lien-the:hover) .bia-chu { transform: translateX(4px); }
.the-bai .lien-the:focus-visible { outline: 2px solid var(--tim); outline-offset: 4px; border-radius: 8px; }
.skill-the { margin: 20px -26px -26px; padding: 16px 26px 20px; background: var(--kem); border-top: 1px solid var(--vien); display: grid; gap: 16px; }
.skill-the-ten { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--chu-phu); }
.skill-the-ten svg { width: 16px; height: 16px; color: var(--tim); flex-shrink: 0; }
.skill-the-ten a { color: var(--chu); font-weight: 700; text-decoration: none; }
.skill-the-ten a:hover { color: var(--tim); }
.skill-the .nut-skill { margin-top: 12px; }

/* Bài nổi bật trang blog */
.bai-dau .noi-dung-the .lien-the { display: flex; flex-direction: column; }
.bai-dau .noi-dung-the .skill-the { margin: 22px -40px -40px; padding: 18px 40px 24px; }
@media (max-width: 760px) { .bai-dau .noi-dung-the .skill-the { margin: 20px -28px -28px; padding: 16px 28px 20px; } }
div.bai-dau:has(a:hover) { box-shadow: var(--bong); border-color: rgba(106, 66, 225, .35); }

/* Đầu bài: bộ nút skill */
.skill-dau-bai { display: grid; gap: 12px; margin-top: 20px; }
.sdb-mot { padding: 14px 16px; border-radius: 16px; background: var(--trang); border: 1px solid var(--vien); }
.sdb-mot .nut-skill { margin-top: 10px; grid-template-columns: repeat(3, auto); justify-content: start; }
.sdb-mot .nut-skill > .nut-chinh { grid-column: auto; }
@media (max-width: 700px) { .sdb-mot .nut-skill { grid-template-columns: 1fr; } }

/* Khối skill trong bài viết */
.noi-dung .skill-trong-bai { margin-top: 2.4em; display: grid; gap: 14px; scroll-margin-top: 84px; }
.the-skill-ngang {
  display: grid; grid-template-columns: 1fr; gap: 4px; padding: 24px; border-radius: 20px;
  background: var(--trang); border: 1px solid var(--vien); border-top: 4px solid var(--tim);
}
.the-skill-ngang.la-suu-tam { border-top: 1px dashed rgba(20, 18, 37, .22); border-style: dashed; background: rgba(255, 255, 255, .7); }
.the-skill-ngang .nhan-loai { color: var(--tim-dam); }
.the-skill-ngang.la-suu-tam .nhan-loai { color: var(--chu-phu); }
.the-skill-ngang b { font-size: 21px; margin-top: 6px; letter-spacing: -.01em; }
.the-skill-ngang b a { text-decoration: none; color: var(--chu); }
.the-skill-ngang b a:hover { color: var(--tim); }
.noi-dung .the-skill-ngang p { margin: 6px 0 0; font-size: 16px; color: var(--chu-phu); }
.noi-dung .the-skill-ngang a.nut { text-decoration: none; }
.noi-dung .the-skill-ngang a.nut-chinh { color: var(--trang); }
.noi-dung .the-skill-ngang a.nut-phu { color: var(--chu); }
.noi-dung .the-skill-ngang .tac-gia-skill a { color: var(--tim-dam); }
@media (min-width: 761px) { .the-skill-ngang .nut-skill { grid-template-columns: repeat(3, auto); justify-content: start; } .the-skill-ngang .nut-skill > .nut-chinh { grid-column: auto; } }
@media (max-width: 1080px) and (min-width: 761px) { .the-thong-tin .nut-skill { grid-template-columns: 1fr 1fr; } .the-thong-tin .nut-skill > .nut-chinh { grid-column: 1 / -1; } }

/* Trang skill chưa có hướng dẫn */
.hd-dang-viet p { color: var(--chu-phu); margin-top: 12px !important; }
.hd-dang-viet .hang-nut { margin-top: 18px; }
.noi-dung .hd-dang-viet a.nut { text-decoration: none; }
.noi-dung .hd-dang-viet a.nut-chinh { color: var(--trang); }
.noi-dung .hd-dang-viet a.nut-phu { color: var(--chu); }


/* ---------- Ảnh trong bài ---------- */
.noi-dung img { max-width: 100%; height: auto; border-radius: 12px; vertical-align: middle; }
.noi-dung .anh-bai { margin: 1.6em 0 0; }
.noi-dung .anh-bai img { display: block; width: 100%; border-radius: 16px; border: 1px solid var(--vien); background: var(--trang); box-shadow: var(--bong); }
.noi-dung .anh-bai figcaption { margin-top: 10px; font-size: 14.5px; color: var(--chu-phu); text-align: center; }
.noi-dung .hd-than .anh-bai { margin-top: 1em; }
.noi-dung .hd-than .anh-bai img { box-shadow: none; }