/* =============================================================
   K03 — thanh phan rieng cua trang khoa hoc (dung chung token styles.css)
   Moi section tu khai background: xem bay "nen body" trong README.
   ============================================================= */

/* ---------- HERO chu (khong dung poster) ---------- */
.k-hero{background:var(--cream);padding-block:clamp(28px,6vw,72px) clamp(40px,7vw,88px)}
.k-hero__grid{display:grid;gap:clamp(22px,4vw,48px);align-items:center}
@media (min-width:960px){.k-hero__grid{grid-template-columns:1.15fr .85fr}}
.k-eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:var(--fs-eyebrow);font-weight:800;
  letter-spacing:.14em;text-transform:uppercase;color:var(--red)}
.k-eyebrow::before{content:"";width:26px;height:2px;background:var(--red)}
.k-hero h1{margin-top:14px;font-size:clamp(27px,6.2vw,50px);line-height:1.18;font-weight:800;color:var(--ink);
  letter-spacing:-.01em;text-wrap:balance}
.k-hero h1 .hl{display:block}
.k-hero__sub{margin-top:16px;font-size:var(--fs-lead);line-height:1.75;color:var(--body);max-width:56ch}
.k-hero__meta{margin-top:20px;display:grid;gap:10px;grid-template-columns:1fr 1fr}
.k-hero__meta li{background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:11px 13px;
  font-size:var(--fs-small);line-height:1.45;color:var(--body)}
.k-hero__meta b{display:block;color:var(--ink);font-size:clamp(14px,3.6vw,16px)}
.k-hero__cta{margin-top:22px;display:grid;gap:10px}
.k-hero__note{font-size:var(--fs-small);color:var(--muted);text-align:center}
@media (min-width:600px){.k-hero__cta{justify-items:start}.k-hero__note{text-align:left}}
.k-hero__anh{position:relative}
.k-hero__anh img{width:100%;border-radius:var(--r-lg);box-shadow:var(--sh-3);aspect-ratio:4/5;object-fit:cover}
.k-hero__tag{position:absolute;left:12px;right:12px;bottom:12px;background:rgba(14,17,20,.82);color:#fff;
  border-radius:var(--r-sm);padding:10px 14px;font-size:13px;line-height:1.45}
.k-hero__tag b{color:#fff;display:block;font-size:15px}
@media (max-width:959px){.k-hero__anh{max-width:420px;margin-inline:auto;width:100%}}

/* ---------- STATEMENT ngan ---------- */
.k-noi{margin-top:clamp(26px,4.6vw,44px);background:var(--ink);color:#fff;border-radius:var(--r-lg);
  padding:clamp(22px,4.4vw,40px);text-align:center;font-size:clamp(17px,4.2vw,26px);line-height:1.5;font-weight:700}
.k-noi .hl{color:#FF7A8D}

/* ---------- 4 BUOC ---------- */
.k-steps{display:grid;gap:16px;counter-reset:b}
@media (min-width:760px){.k-steps{grid-template-columns:1fr 1fr;gap:22px}}
.k-step{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:clamp(18px,3.4vw,26px);
  box-shadow:var(--sh-1);position:relative}
.k-step__so{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--red);
  color:#fff;font-weight:800;font-size:17px}
.k-step h3{margin-top:12px;font-size:clamp(17px,4vw,20px);line-height:1.35;color:var(--ink);font-weight:800}
.k-step p{margin-top:8px;line-height:1.75}

/* ---------- THONG KE ---------- */
.k-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:clamp(26px,4.6vw,40px)}
.k-stat{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:16px 10px;text-align:center}
.k-stat b{display:block;font-size:clamp(24px,6vw,42px);line-height:1.1;color:var(--red);font-weight:800}
.k-stat span{display:block;margin-top:6px;font-size:clamp(12px,3.2vw,14px);line-height:1.4;color:var(--body)}

/* ---------- BANG GIA TRI ---------- */
.k-vt{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-2)}
.k-vt__nhom{background:var(--ink);color:#fff;padding:12px clamp(14px,3vw,22px);font-weight:800;font-size:clamp(13px,3.4vw,15px);
  letter-spacing:.04em}
.k-vt__nhom .hl{color:#FF7A8D}
.k-vt__dong{display:grid;grid-template-columns:1fr auto;gap:12px;padding:13px clamp(14px,3vw,22px);
  border-bottom:1px solid var(--line);font-size:var(--fs-small);line-height:1.6;align-items:center}
.k-vt__dong em{font-style:normal;font-weight:800;color:var(--ink);white-space:nowrap}
.k-vt__dong em.tang{color:var(--red)}
.k-vt__tong{display:grid;grid-template-columns:1fr auto;gap:12px;padding:16px clamp(14px,3vw,22px);
  background:var(--red-tint);font-weight:800;color:var(--ink);font-size:clamp(16px,4vw,20px)}
.k-vt__tong em{font-style:normal;color:var(--red)}

/* ---------- HOC PHI ---------- */
.k-gia{display:grid;gap:clamp(18px,3.4vw,28px)}
@media (min-width:980px){.k-gia{grid-template-columns:1fr 1fr;align-items:start}}
.k-gia__the{background:var(--ink);color:#fff;border-radius:var(--r-lg);padding:clamp(22px,4.4vw,36px);text-align:center;
  box-shadow:var(--sh-3)}
.k-gia__nhan{font-size:13px;letter-spacing:.14em;font-weight:800;color:#FF7A8D;text-transform:uppercase}
.k-gia__cu{margin-top:10px;color:#9AA3AD;text-decoration:line-through;font-size:clamp(16px,4vw,20px)}
.k-gia__moi{margin-top:4px;font-size:clamp(38px,10vw,60px);line-height:1.05;font-weight:800;color:#fff}
.k-gia__han{margin-top:12px;display:inline-block;background:var(--red);color:#fff;border-radius:var(--r-pill);
  padding:7px 16px;font-weight:700;font-size:var(--fs-small)}
.k-gia__dot{margin-top:22px;display:grid;gap:8px;text-align:left}
.k-gia__dot li{display:grid;grid-template-columns:1fr auto;gap:10px;padding:10px 0;border-top:1px solid rgba(255,255,255,.14);
  font-size:var(--fs-small);color:#D5DAE0}
.k-gia__dot li b{color:#fff}
.k-box{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:clamp(18px,3.6vw,28px)}
.k-box + .k-box{margin-top:16px}
.k-box h3{font-size:clamp(17px,4vw,21px);line-height:1.35;color:var(--ink);font-weight:800}
.k-box h3 .hl{color:var(--red)}
.k-box p,.k-box li{margin-top:10px;line-height:1.72}
.k-box ul li{position:relative;padding-left:22px}
.k-box ul li::before{content:"";position:absolute;left:4px;top:.72em;width:8px;height:8px;border-radius:50%;background:var(--red)}
.k-box--do{border:2px solid var(--red);background:var(--red-tint)}

/* ---------- CHUYEN KHOAN ---------- */
.k-ck{display:grid;gap:16px;align-items:center}
@media (min-width:600px){.k-ck{grid-template-columns:190px 1fr}}
.k-ck img{width:100%;max-width:220px;margin-inline:auto;border-radius:var(--r-md);border:1px solid var(--line)}
.k-ck dl{margin:0;display:grid;gap:6px}
.k-ck dt{font-size:12.5px;color:var(--muted);margin:0}
.k-ck dd{margin:0 0 6px;font-weight:800;color:var(--ink);font-size:clamp(15px,3.8vw,17px)}

/* ---------- FAQ ---------- */
.k-faq{display:grid;gap:12px;max-width:860px;margin-inline:auto}
.k-faq details{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:0 clamp(14px,3vw,22px)}
.k-faq summary{cursor:pointer;list-style:none;padding:16px 32px 16px 0;font-weight:700;color:var(--ink);position:relative;
  line-height:1.5}
.k-faq summary::-webkit-details-marker{display:none}
.k-faq summary::after{content:"+";position:absolute;right:0;top:12px;font-size:24px;color:var(--red);font-weight:700}
.k-faq details[open] summary::after{content:"–"}
.k-faq details p{padding-bottom:16px;line-height:1.75}

/* ---------- 4 video ---------- */
@media (min-width:760px){.video-grid--4{grid-template-columns:1fr 1fr}}
@media (min-width:1100px){.video-grid--4{grid-template-columns:repeat(4,1fr)}}

/* ---------- Nut Zalo phu ---------- */
.btn--vien{background:#fff;color:var(--red);border:2px solid var(--red);box-shadow:none}
.btn--vien:hover{background:var(--red-tint);color:var(--red)}
.k-lienhe{margin-top:18px;display:grid;gap:10px;justify-items:center}

/* ---------- danh sach dau tick (khong can SVG) ---------- */
.k-ticks{display:grid;gap:12px}
.k-ticks li{position:relative;padding-left:32px;line-height:1.7}
.k-ticks li::before{content:"";position:absolute;left:0;top:.2em;width:22px;height:22px;border-radius:50%;
  background:var(--red) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 12.5 4 4L18 8'/%3E%3C/svg%3E") center/14px no-repeat}
.mod .k-ticks{margin-top:4px}
.k-ban{margin-top:14px;font-size:var(--fs-small);line-height:1.7;background:var(--cream);border-radius:var(--r-sm);padding:12px 14px}
.k-ban b{color:var(--red)}
.k-khong{margin-top:clamp(22px,4vw,34px);background:#fff;border:1px dashed rgba(14,17,20,.25);border-radius:var(--r-md);padding:16px 18px;font-size:var(--fs-small);line-height:1.7}
.k-khong b{display:block;color:var(--ink);margin-bottom:6px}

/* mod khong co icon: tieu de chiem tron dong */
.mod__top{grid-template-columns:1fr !important}