/* Ken Atelier - kenatelier.com
   Hệ màu "bạc lạnh + chàm": nền xám bạc lạnh, chữ mực than, MỘT màu nhấn xanh chàm.
   Chữ: Noto Serif Display (hiển thị) + Be Vietnam Pro (thân bài, giao diện). Cả hai có bộ dấu tiếng Việt. */

:root {
  --nen: #ECEEF1;
  --nen-2: #E0E4E9;
  --trang: #F7F8FA;
  --muc: #15181D;
  --muc-nhat: #49515B;
  --cham: #22406B;
  --cham-dam: #182F50;
  --chu-tren-cham: #F7F8FA;
  --vien: #6F7984;
  --ke: #BAC1C9;
  --loi: #8E2424;
  --serif: "Noto Serif Display", "Times New Roman", Georgia, serif;
  --sans: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --rong: 1180px;
  --le: 20px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --nen: #121519;
    --nen-2: #1A1E24;
    --trang: #1A1E24;
    --muc: #E7E9EC;
    --muc-nhat: #A7AEB7;
    --cham: #A9C0E3;
    --cham-dam: #C4D4EC;
    --chu-tren-cham: #121519;
    --vien: #7D8691;
    --ke: #343A42;
    --loi: #F0A3A3;
  }
}
:root[data-theme="dark"] {
  --nen: #121519;
  --nen-2: #1A1E24;
  --trang: #1A1E24;
  --muc: #E7E9EC;
  --muc-nhat: #A7AEB7;
  --cham: #A9C0E3;
  --cham-dam: #C4D4EC;
  --chu-tren-cham: #121519;
  --vien: #7D8691;
  --ke: #343A42;
  --loi: #F0A3A3;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--nen);
  color: var(--muc);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  overflow-wrap: break-word;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--cham); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { color: var(--cham-dam); }
:focus-visible { outline: 2px solid var(--cham); outline-offset: 3px; }
[id] { scroll-margin-top: 88px; }

.bo-qua {
  position: absolute; left: -9999px; top: 0;
  background: var(--cham); color: var(--chu-tren-cham); padding: 10px 16px; z-index: 50;
}
.bo-qua:focus { left: 16px; top: 12px; }

.khung { width: 100%; max-width: var(--rong); margin-inline: auto; padding-inline: var(--le); }
@media (min-width: 900px) { :root { --le: 40px; } }

h1, h2, h3, .serif { font-family: var(--serif); font-weight: 400; letter-spacing: -0.005em; }
h1 { font-size: clamp(2.3rem, 6.2vw, 4.4rem); line-height: 1.1; margin: 0 0 0.5em; }
h2 { font-size: clamp(1.75rem, 3.6vw, 2.75rem); line-height: 1.15; margin: 0 0 0.6em; }
h3 { font-size: 1.45rem; line-height: 1.25; margin: 1.6em 0 0.4em; }
p { margin: 0 0 1.1em; }
em { font-style: italic; }
h1 em { white-space: nowrap; }

/* Đầu trang */
.dau-trang {
  position: sticky; top: 0; z-index: 20;
  background: var(--nen);
  border-bottom: 1px solid var(--ke);
}
.dau-trang .khung { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
.ten-hieu { font-family: var(--serif); font-size: 1.45rem; color: var(--muc); text-decoration: none; letter-spacing: 0.01em; white-space: nowrap; }
.ten-hieu:hover { color: var(--muc); }
.dieu-huong { display: none; }
.dieu-huong ul { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: 28px; }
.dieu-huong a { color: var(--muc); text-decoration: none; font-size: 0.95rem; padding: 6px 0; }
.dieu-huong a:hover, .dieu-huong a[aria-current="page"] { text-decoration: underline; }
.menu-gon { position: relative; }
.menu-gon summary {
  list-style: none; cursor: pointer; font-size: 0.95rem; padding: 10px 14px;
  border: 1px solid var(--vien); border-radius: 2px; min-height: 44px; display: flex; align-items: center;
}
.menu-gon summary::-webkit-details-marker { display: none; }
.menu-gon[open] summary { background: var(--nen-2); }
.menu-gon ul {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 230px;
  list-style: none; margin: 0; padding: 8px 0; background: var(--trang); border: 1px solid var(--ke);
  box-shadow: 0 12px 28px -18px rgba(10, 14, 20, 0.45);
}
.menu-gon li a { display: block; padding: 12px 20px; color: var(--muc); text-decoration: none; }
.menu-gon li a:hover { background: var(--nen-2); }
@media (min-width: 900px) {
  .dieu-huong { display: block; }
  .menu-gon { display: none; }
}

/* Nút */
.nut {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 12px 26px; border-radius: 2px;
  background: var(--cham); color: var(--chu-tren-cham); border: 1px solid var(--cham);
  font: 500 1rem/1.2 var(--sans); text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: background-color .18s ease, border-color .18s ease;
}
.nut:hover { background: var(--cham-dam); border-color: var(--cham-dam); color: var(--chu-tren-cham); }
.nut[disabled] { opacity: .65; cursor: progress; }
.nut-vien { background: transparent; color: var(--cham); }
.nut-vien:hover { background: var(--cham); color: var(--chu-tren-cham); }
.dieu-huong .nut { min-height: 40px; padding: 8px 18px; color: var(--chu-tren-cham); }
.dieu-huong .nut:hover { text-decoration: none; }
.lien-ket { font-weight: 500; }

/* Mở đầu trang chủ */
.mo-dau { padding: 40px 0 56px; }
.mo-dau .khung { display: grid; gap: 40px; align-items: center; }
.mo-dau .phu { font-size: 1.15rem; color: var(--muc-nhat); max-width: 34ch; margin-bottom: 1.6em; }
.hang-nut { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 28px; }
@media (min-width: 900px) {
  .mo-dau { padding: 64px 0 88px; }
  .mo-dau .khung { grid-template-columns: 1.15fr 0.85fr; gap: 72px; }
}

.nhan-dau { font-size: 0.82rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--cham); margin: 0 0 18px; }

/* Khối ảnh chừa sẵn: hiện là hình rập vẽ nét; thay bằng <img> ảnh thật khi có */
.khung-anh {
  margin: 0; aspect-ratio: 4 / 5; background: var(--nen-2); border: 1px solid var(--ke);
  display: flex; align-items: center; justify-content: center; padding: 8%; color: var(--muc);
  overflow: hidden;
}
.khung-anh img { width: 100%; height: 100%; object-fit: cover; }
.khung-anh svg { width: 100%; height: 100%; }
.khung-anh .net { fill: none; stroke: currentColor; stroke-width: 1.4; }
.khung-anh .chi-luoc { fill: none; stroke: var(--cham); stroke-width: 1.4; stroke-dasharray: 7 6; }
.khung-anh .ghi { font-family: var(--sans); font-size: 13px; letter-spacing: .08em; fill: var(--muc-nhat); }
@media (max-width: 899px) { .mo-dau .khung-anh { max-width: 420px; aspect-ratio: 5 / 5.4; } }

/* Đoạn tinh thần */
.tinh-than { padding: 72px 0; border-top: 1px solid var(--ke); }
.tinh-than .noi-dung { max-width: 62ch; margin-left: auto; margin-right: auto; }
.dan { font-family: var(--serif); font-size: clamp(1.35rem, 2.4vw, 1.75rem); line-height: 1.45; color: var(--muc); }
@media (min-width: 900px) { .tinh-than .noi-dung { margin-left: 16%; } }

/* Danh mục những gì may */
.dong-may { padding: 72px 0; background: var(--nen-2); }
.dong-may ul { list-style: none; margin: 32px 0 0; padding: 0; }
.dong-may li { display: grid; gap: 8px 48px; padding: 28px 0; border-bottom: 1px solid var(--ke); }
.dong-may li:first-child { border-top: 1px solid var(--ke); }
.dong-may .ten-dong { font-family: var(--serif); font-size: clamp(1.7rem, 3vw, 2.3rem); line-height: 1.15; margin: 0; }
.dong-may .ten-dong span { display: block; font-size: 1rem; font-style: italic; color: var(--muc-nhat); margin-top: 6px; }
.dong-may li p { margin: 0; color: var(--muc); max-width: 52ch; }
.dong-may .chu-thich { margin-top: 28px; color: var(--muc-nhat); }
@media (min-width: 900px) { .dong-may li { grid-template-columns: 5fr 7fr; align-items: baseline; } }

/* Quy trình: đường chỉ lược nối các chặng */
.quy-trinh { padding: 72px 0; }
.chang { list-style: none; margin: 36px 0 28px; padding: 0 0 0 28px; position: relative; display: grid; gap: 30px; }
.chang::before { content: ""; position: absolute; left: 5px; top: 8px; bottom: 8px; border-left: 1.5px dashed var(--cham); }
.chang li { position: relative; }
.chang li::before {
  content: ""; position: absolute; left: -28px; top: 0.55em; width: 12px; height: 1.5px; background: var(--cham);
}
.chang h3 { margin: 0 0 4px; font-size: 1.6rem; }
.chang p { margin: 0; color: var(--muc-nhat); max-width: 40ch; }
@media (min-width: 1100px) {
  .chang { grid-template-columns: repeat(5, 1fr); padding: 34px 0 0; gap: 28px; }
  .chang::before { left: 0; right: 0; top: 0; bottom: auto; border-left: 0; border-top: 1.5px dashed var(--cham); }
  .chang li::before { left: 0; top: -40px; width: 1.5px; height: 12px; }
}

/* Tạp chí trên trang chủ: một bài lớn + hai bài nhỏ */
.tap-chi-tom { padding: 72px 0; border-top: 1px solid var(--ke); }
.luoi-bai { display: grid; gap: 40px; margin-top: 32px; }
.bai-lon h3 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); margin: 0 0 12px; line-height: 1.15; }
.bai-nho h3 { font-size: 1.4rem; margin: 0 0 8px; }
.bai-lon h3 a, .bai-nho h3 a { color: var(--muc); text-decoration: none; }
.bai-lon h3 a:hover, .bai-nho h3 a:hover { text-decoration: underline; }
.bai-lon p, .bai-nho p { color: var(--muc-nhat); max-width: 52ch; }
.cot-nho { display: grid; gap: 28px; }
.bai-nho + .bai-nho { border-top: 1px solid var(--ke); padding-top: 28px; }
@media (min-width: 900px) { .luoi-bai { grid-template-columns: 7fr 5fr; gap: 72px; } }

/* Đặt lịch */
.dat-lich { padding: 72px 0 88px; background: var(--nen-2); }
.dat-lich .khung { display: grid; gap: 36px; }
.dat-lich .gioi-thieu p { color: var(--muc-nhat); max-width: 42ch; }
@media (min-width: 900px) { .dat-lich .khung { grid-template-columns: 5fr 7fr; gap: 72px; } }
form.mau { display: grid; gap: 20px; }
.o { display: grid; gap: 6px; }
.o label, fieldset legend { font-weight: 500; font-size: 0.98rem; }
.o .goi-y { font-size: 0.9rem; color: var(--muc-nhat); }
.o input[type="text"], .o input[type="tel"], .o input[type="email"], .o textarea {
  width: 100%; font: 400 1rem/1.5 var(--sans); color: var(--muc); background: var(--trang);
  border: 1px solid var(--vien); border-radius: 2px; padding: 12px 14px; min-height: 48px;
}
.o textarea { min-height: 110px; resize: vertical; }
.o input:focus-visible, .o textarea:focus-visible { outline: 2px solid var(--cham); outline-offset: 1px; border-color: var(--cham); }
.o [aria-invalid="true"] { border-color: var(--loi); }
.bao-loi { color: var(--loi); font-size: 0.92rem; min-height: 0; }
.bao-loi:empty { display: none; }
fieldset { border: 0; margin: 0; padding: 0; display: grid; gap: 10px; }
.chon { display: flex; align-items: flex-start; gap: 12px; cursor: pointer; }
.chon input { width: 20px; height: 20px; margin: 3px 0 0; flex: none; accent-color: var(--cham); }
.dong-y { border-top: 1px solid var(--ke); padding-top: 18px; display: grid; gap: 14px; font-size: 0.95rem; }
.dong-y .nhan { font-size: 0.82rem; font-weight: 600; letter-spacing: .06em; color: var(--muc-nhat); display: block; }
.o-bay { position: absolute !important; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.ket-qua { padding: 16px 18px; border: 1px solid var(--vien); background: var(--trang); }
.ket-qua:empty { display: none; }
.ket-qua.loi { border-color: var(--loi); color: var(--loi); }

/* Trang con & bài viết */
.dau-muc { padding: 56px 0 32px; }
.dau-muc .dan { max-width: 46ch; color: var(--muc-nhat); }
.than-trang { padding: 8px 0 80px; }
.cot-doc { max-width: 68ch; }
.khung.cot-doc { max-width: var(--rong); }
.khung.cot-doc > * { max-width: 68ch; }
.cot-doc h2 { margin-top: 1.8em; font-size: clamp(1.6rem, 3vw, 2.15rem); }
.cot-doc ul, .cot-doc ol { padding-left: 1.2em; margin: 0 0 1.2em; }
.cot-doc li { margin-bottom: 0.45em; }
.dong-tin { color: var(--muc-nhat); font-size: 0.95rem; margin-bottom: 2em; }
.nguon { margin-top: 3em; padding-top: 1.4em; border-top: 1px solid var(--ke); font-size: 0.95rem; color: var(--muc-nhat); }
.nguon h2 { font-size: 1.35rem; margin-top: 0; }
.ket { margin-top: 2.2em; padding: 22px 24px; background: var(--nen-2); border-left: 2px solid var(--cham); }
.hai-cot { display: grid; gap: 40px; }
@media (min-width: 900px) { .hai-cot { grid-template-columns: 7fr 5fr; gap: 72px; align-items: start; } .hai-cot .khung-anh { position: sticky; top: 100px; } }
.nguyen-tac h2 { font-size: clamp(1.5rem, 2.8vw, 2rem); margin: 1.6em 0 0.4em; }
.nguyen-tac h2:first-child { margin-top: 0; }
.chang-chi-tiet { border-top: 1px solid var(--ke); padding-top: 28px; margin-top: 36px; }
.chang-chi-tiet h2 { margin-top: 0; }
.hoi-dap dt { font-family: var(--serif); font-size: 1.3rem; margin-top: 1.2em; }
.hoi-dap dd { margin: 0.3em 0 0; color: var(--muc-nhat); }
.danh-sach-bai { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; }
.danh-sach-bai li { padding: 30px 0; border-bottom: 1px solid var(--ke); }
.danh-sach-bai li:first-child { border-top: 1px solid var(--ke); }
.danh-sach-bai h2 { margin: 0 0 8px; font-size: clamp(1.5rem, 3vw, 2.1rem); }
.danh-sach-bai h2 a { color: var(--muc); text-decoration: none; }
.danh-sach-bai h2 a:hover { text-decoration: underline; }
.danh-sach-bai p { margin: 0; color: var(--muc-nhat); max-width: 60ch; }
table.phien-ban { width: 100%; border-collapse: collapse; font-size: 0.95rem; margin: 1em 0 1.4em; }
table.phien-ban th, table.phien-ban td { text-align: left; vertical-align: top; padding: 12px 10px; border-bottom: 1px solid var(--ke); }
table.phien-ban th { font-weight: 600; }
.cuon-ngang { overflow-x: auto; }

/* Chân trang */
.chan-trang { border-top: 1px solid var(--ke); padding: 48px 0 40px; font-size: 0.95rem; color: var(--muc-nhat); }
.chan-trang .khung { display: grid; gap: 24px; }
.chan-trang .ten-hieu { font-size: 1.6rem; }
.chan-trang ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 24px; }
.chan-trang a { color: var(--muc); }
@media (min-width: 900px) { .chan-trang .khung { grid-template-columns: 1fr auto; align-items: end; } }

/* Thông báo cookie (bấm "Đã hiểu" chỉ ẩn thông báo) */
.thong-bao-cookie {
  position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 40; max-width: 620px; margin-left: auto;
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px;
  background: var(--trang); color: var(--muc); border: 1px solid var(--vien); padding: 14px 16px;
  font-size: 0.9rem; line-height: 1.55; box-shadow: 0 14px 30px -20px rgba(10, 14, 20, 0.5);
}
.thong-bao-cookie[hidden] { display: none; }
.thong-bao-cookie p { margin: 0; flex: 1 1 280px; }
.nut-nho { min-height: 44px; padding: 8px 18px; font-size: 0.95rem; }
.thong-bao-cookie .hai-nut { display: flex; gap: 10px; flex: 1 1 100%; }
.thong-bao-cookie .hai-nut .nut { flex: 1 1 0; min-width: 110px; }
@media (min-width: 640px) { .thong-bao-cookie .hai-nut { flex: 0 0 auto; } }
.bao-cookie { margin: 0; flex: 1 1 100%; color: var(--muc-nhat); }
.bao-cookie:empty { display: none; }
.nut-chu { background: none; border: 0; padding: 0; min-height: 24px; font: inherit; color: var(--muc); text-decoration: underline; text-underline-offset: 0.2em; cursor: pointer; }
.nut-chu:hover { color: var(--cham); }
form.mau > .goi-y { font-size: 0.9rem; color: var(--muc-nhat); margin: 0; }

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