/* SkillSwap — giao diện tĩnh, không hiệu ứng động. Font hệ thống (không tải font ngoài).
   Bảng màu theo slide: navy #1E1B4B · coral #FF6B5B · teal #17B8A6 · violet #6C63FF.
   Mọi cặp chữ/nền đạt WCAG AA (≥ 4,5:1): chữ trắng trên violet đậm #5A50F0 (5,5:1),
   chữ navy trên coral (5,7:1) và trên teal (6,4:1). */
:root {
  --navy: #1E1B4B;
  --navy-2: #2B2768;
  --coral: #FF6B5B;
  --coral-nhat: #FFE9E6;
  --coral-chu: #B4372A;
  --teal: #17B8A6;
  --teal-nhat: #E0F6F3;
  --teal-chu: #0B6B60;
  --violet: #6C63FF;
  --chinh: #5A50F0;        /* violet đủ đậm cho chữ trắng */
  --chinh-dam: #4338CA;
  --chinh-nhat: #EEEDFF;
  --lien-ket: #4F46E5;
  --chu: #1E1B4B;
  --mo: #5B6170;
  --vien: #E2E3EE;
  --nen: #F6F7FB;
  --trang: #ffffff;
  --do: #B42318;
  --bo: 12px;
  --bong: 0 1px 2px rgba(30, 27, 75, .06), 0 2px 8px rgba(30, 27, 75, .05);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  color: var(--chu);
  line-height: 1.55;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--nen); font-size: 16px; overflow-x: hidden; }
img { max-width: 100%; height: auto; }
a { color: var(--lien-ket); text-underline-offset: 2px; }
a:hover { color: var(--chinh-dam); }
h1 { font-size: 1.8rem; line-height: 1.2; margin: .3em 0 .5em; letter-spacing: -.01em; }
h2 { font-size: 1.25rem; margin: 1.6em 0 .6em; }
h3 { font-size: 1.05rem; margin: .3em 0; overflow-wrap: anywhere; }
p { margin: .5em 0; overflow-wrap: anywhere; }
:focus-visible { outline: 3px solid var(--violet); outline-offset: 2px; }

.khung { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.khung.hep { max-width: 760px; }
main { min-height: 60vh; padding: 24px 0 56px; }
main:focus { outline: none; }
.bo-qua { position: absolute; left: -9999px; }
.bo-qua:focus { left: 8px; top: 8px; background: #fff; padding: 8px 12px; z-index: 50; }
.mo { color: var(--mo); }
.loi { color: var(--do); }
.giua { text-align: center; }
.chu-tai { color: var(--mo); }
.cat-chu { max-width: 260px; overflow-wrap: anywhere; }

/* Banner chạy thử */
.banner-chay-thu { background: #FFF6D8; border-bottom: 1px solid #F0DE9A; font-size: .88rem; color: var(--navy); }
.banner-trong { display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center; padding-top: 6px; padding-bottom: 6px; }
.chuyen-nguoi { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.chuyen-nguoi select { max-width: 100%; min-width: 0; min-height: 34px; padding: 4px 8px; }
.banner-chay-thu .nut { min-height: 34px; padding: 4px 10px; }

/* Đầu trang (navy) */
.dau-trang { background: var(--navy); color: #fff; position: sticky; top: 0; z-index: 20; box-shadow: 0 1px 0 rgba(255,255,255,.06); }
.dau-trong { display: flex; align-items: center; gap: 12px; min-height: 60px; flex-wrap: nowrap; }
.logo { font-weight: 800; font-size: 1.3rem; text-decoration: none; letter-spacing: -.02em; display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; flex: none; }
.dau-trang .khung { max-width: 1320px; }
.logo::before { content: ""; width: 26px; height: 26px; border-radius: 8px; background: var(--coral) url("../favicon.svg") center / cover; }
.logo-dau { color: #fff; }
.logo-sau { color: var(--coral); }
.menu { display: flex; gap: 2px; flex: 1; min-width: 0; flex-wrap: nowrap; }
.menu a { padding: 8px 9px; border-radius: 8px; text-decoration: none; color: #E4E2FF; font-weight: 500; white-space: nowrap; font-size: .94rem; }
.menu a:hover { background: var(--navy-2); color: #fff; }
.menu a.dang-o { color: #fff; background: var(--navy-2); box-shadow: inset 0 -3px 0 var(--coral); }
.cham { display: inline-block; min-width: 20px; padding: 0 6px; margin-left: 6px; border-radius: 10px; background: var(--coral); color: var(--navy); font-size: .75rem; font-weight: 800; text-align: center; line-height: 20px; }
.tai-khoan { display: flex; gap: 8px; align-items: center; flex: none; }
.diem-pill { background: var(--teal); color: var(--navy); font-weight: 800; padding: 5px 12px; border-radius: 999px; text-decoration: none; white-space: nowrap; }
.diem-pill:hover { color: var(--navy); filter: brightness(1.05); }
.ten-toi { font-weight: 600; text-decoration: none; color: #fff; max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: inline-block; }
.ten-toi:hover { color: #fff; text-decoration: underline; }
.dau-trang .nut { background: transparent; color: #fff; border-color: rgba(255,255,255,.35); }
.dau-trang .nut:hover { border-color: #fff; color: #fff; }
.dau-trang .nut-chinh { background: var(--coral); border-color: var(--coral); color: var(--navy); }
.dau-trang .nut-chinh:hover { background: #FF8576; border-color: #FF8576; color: var(--navy); }
.nut-menu { display: none; }

/* Nút */
.nut { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 10px 16px; border-radius: 10px; border: 1px solid #CDD0E0;
  background: var(--trang); color: var(--chu); font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; min-height: 42px; }
.nut:hover { border-color: var(--chinh); color: var(--chinh-dam); }
.nut-chinh { background: var(--chinh); border-color: var(--chinh); color: #fff; }
.nut-chinh:hover { background: var(--chinh-dam); border-color: var(--chinh-dam); color: #fff; }
.nut-cta { background: var(--coral); border-color: var(--coral); color: var(--navy); }
.nut-cta:hover { background: #FF8576; border-color: #FF8576; color: var(--navy); }
.nut-xoa { color: var(--do); }
.nut-xoa:hover { color: var(--do); border-color: var(--do); }
.nut-chay-thu { background: #FFF6D8; border-color: #E8CF6E; color: var(--navy); }
.nut-nho { padding: 6px 12px; min-height: 36px; font-size: .92rem; }
.nut-trong-dong { margin-left: 8px; min-height: 30px; padding: 2px 10px; }
.nut:disabled { opacity: .55; cursor: progress; }
.hang-nut { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 12px 0; }
.lien-ket { background: none; border: 0; padding: 0; color: var(--lien-ket); text-decoration: underline; font: inherit; cursor: pointer; text-align: left; overflow-wrap: anywhere; }

/* Hero (navy) */
.hero { background: var(--navy); color: #fff; margin: -24px 0 8px; padding: 48px 0 40px; border-bottom: 4px solid var(--coral); }
.hero h1 { font-size: 2.5rem; max-width: 780px; color: #fff; }
.hero h1 .nhan-manh { color: var(--coral); }
.nho-tren { color: var(--teal); font-weight: 800; text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; }
.lon { font-size: 1.12rem; max-width: 760px; color: #D9D7F5; }
.hero .nut:not(.nut-cta) { background: transparent; color: #fff; border-color: rgba(255,255,255,.45); }
.hero .nut:not(.nut-cta):hover { border-color: #fff; }
.ten-giai-thich { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 24px; max-width: 780px; }
.ten-giai-thich p { background: var(--navy-2); border-radius: var(--bo); padding: 14px 16px; margin: 0; color: #E4E2FF; border-left: 4px solid var(--teal); }
.ten-giai-thich p + p { border-left-color: var(--coral); }
.ten-giai-thich strong { color: #fff; }

/* Ô số liệu */
.luoi-so { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.o-so { background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); padding: 16px 18px; box-shadow: var(--bong); border-top: 4px solid var(--violet); }
.o-so:nth-child(2) { border-top-color: var(--coral); }
.o-so:nth-child(3) { border-top-color: var(--teal); }
.o-so:nth-child(4) { border-top-color: var(--navy); }
.o-so strong { display: block; font-size: 1.9rem; color: var(--navy); line-height: 1.2; }
.o-so span { color: var(--mo); font-size: .92rem; }
.luoi-so.nho .o-so strong { font-size: 1.35rem; }
.luoi-so.nho { margin: 16px 0; }

.buoc { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; counter-reset: b; }
.buoc li { background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); padding: 16px; counter-increment: b; box-shadow: var(--bong); }
.buoc li::before { content: counter(b); display: inline-flex; width: 30px; height: 30px; border-radius: 50%; background: var(--coral); color: var(--navy); align-items: center; justify-content: center; font-weight: 800; margin-bottom: 8px; }
.buoc strong, .buoc span { display: block; }
.buoc span { color: var(--mo); font-size: .95rem; }

.dau-muc { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.dau-muc h1, .dau-muc h2 { margin-bottom: .3em; }

/* Thẻ */
.luoi-the { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.the-tl, .the-kh, .the-nguoi { display: block; background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); padding: 16px; color: var(--chu); text-decoration: none; min-width: 0; box-shadow: var(--bong); }
a.the-tl:hover, a.the-nguoi:hover { border-color: var(--violet); color: var(--chu); }
.the-tl-dau { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 6px; }
.the { display: inline-block; padding: 2px 9px; border-radius: 999px; background: var(--chinh-nhat); color: var(--chinh-dam); font-size: .78rem; font-weight: 700; line-height: 1.6; max-width: 100%; overflow-wrap: anywhere; }
.the.nhat { background: #EEF0F6; color: #3B3F55; }
.the.xanh { background: var(--teal-nhat); color: var(--teal-chu); }
.the.xanh.dam { background: var(--teal); color: var(--navy); }
.the.cam { background: var(--coral-nhat); color: var(--coral-chu); }
.the.xam { background: #EDEEF2; color: var(--mo); }
.ds-the { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 8px; }
.nhan-nho { font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--mo); margin: 8px 0 2px; font-weight: 800; }
.the-nguoi-dau { display: flex; gap: 12px; align-items: flex-start; }
.the-nguoi-dau > div:nth-child(2) { flex: 1; min-width: 0; }
.avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--navy); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; flex: none; box-shadow: inset 0 -3px 0 var(--coral); }
.avatar.lon { width: 64px; height: 64px; font-size: 1.5rem; }
.sao { color: #92400E; font-weight: 600; font-size: .92rem; }
.sao.mo { color: var(--mo); font-weight: 400; }
.lien-ket-ngoai { font-weight: 600; }

/* Lọc */
.thanh-loc { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.thanh-loc input, .thanh-loc select { flex: 1 1 220px; min-width: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.chip { border: 1px solid #CDD0E0; background: var(--trang); border-radius: 999px; padding: 6px 12px; font: inherit; font-size: .9rem; cursor: pointer; color: var(--chu); }
.chip:hover { border-color: var(--chinh); }
.chip.chon { background: var(--navy); border-color: var(--navy); color: #fff; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--vien); margin: 16px 0; flex-wrap: wrap; }
.tab { border: 0; background: none; padding: 10px 14px; font: inherit; font-weight: 600; color: var(--mo); cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -1px; }
.tab.chon { color: var(--navy); border-bottom-color: var(--coral); }

/* Form */
input, select, textarea { font: inherit; color: inherit; padding: 9px 11px; border: 1px solid #C5C9DA; border-radius: 10px; background: #fff; width: 100%; max-width: 100%; min-height: 42px; }
input:focus, select:focus, textarea:focus { border-color: var(--chinh); }
input[type=checkbox], input[type=radio] { width: auto; min-height: 0; accent-color: var(--chinh); }
input[type=file] { padding: 7px; }
textarea { resize: vertical; }
.form { display: flex; flex-direction: column; gap: 12px; }
.o-nhap { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.o-nhap .nhan { font-weight: 600; font-size: .92rem; }
.goi-y { color: var(--mo); font-size: .85rem; margin: 0; }
.o-nhap p.loi { margin: 0; font-size: .9rem; }
.o-tick { display: flex; gap: 10px; align-items: flex-start; }
.o-tick input { margin-top: 5px; }
.luoi-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.khung-vien { background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); padding: 16px; margin: 12px 0; box-shadow: var(--bong); }
.khung-vien > summary { cursor: pointer; font-weight: 600; }
.goi-y-hop { background: var(--chinh-nhat); border-left: 4px solid var(--violet); border-radius: 8px; padding: 10px 12px; }
.thong-bao { background: var(--teal-nhat); border-left: 4px solid var(--teal); border-radius: 8px; padding: 10px 12px; color: #08473F; }
.ds-sua { display: flex; flex-direction: column; gap: 8px; margin-bottom: 8px; }
.dong-sua { display: grid; grid-template-columns: 180px minmax(0, 1fr) 160px auto; gap: 8px; align-items: end; background: var(--trang); border: 1px solid var(--vien); border-radius: 10px; padding: 10px; }
.dong-sua[data-loai=hoc] { grid-template-columns: 180px minmax(0, 1fr) auto; }
.dong-sua.khoa { grid-template-columns: 130px repeat(5, minmax(0, 1fr)) auto; }
.thanh-luu { position: sticky; bottom: 0; background: var(--nen); padding: 12px 0; border-top: 1px solid var(--vien); }

/* Bảng */
.bang-cuon { overflow-x: auto; max-width: 100%; }
.bang { width: 100%; border-collapse: collapse; background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); }
.bang th, .bang td { padding: 10px 12px; border-bottom: 1px solid var(--vien); text-align: left; vertical-align: top; }
.bang th { background: var(--navy); color: #fff; font-size: .86rem; font-weight: 600; }
.bang tbody tr:nth-child(even) { background: #FAFAFE; }
.so-duong { color: var(--teal-chu); font-weight: 700; }
.so-am { color: var(--do); font-weight: 700; }

/* Hồ sơ */
.ho-so-dau { display: flex; gap: 16px; align-items: center; }
.ho-so-dau h1 { margin: 0; }
.hai-cot { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.ds { padding-left: 20px; }
.ds-danh-gia { list-style: none; padding: 0; }
.ds-danh-gia li { background: var(--trang); border: 1px solid var(--vien); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; }

/* Buổi học / trao đổi */
.ds-buoi { display: flex; flex-direction: column; gap: 10px; }
.the-buoi { background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); padding: 16px; min-width: 0; box-shadow: var(--bong); }
.the-buoi.can-xu-ly { border-left: 5px solid var(--coral); }
.khu-file { margin-top: 8px; border-top: 1px dashed var(--vien); padding-top: 8px; }
.khu-file summary { cursor: pointer; color: var(--chinh-dam); font-weight: 600; }
.ds-file { padding-left: 20px; }
.ds-file li { margin: 4px 0; }
.form-danh-gia { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 8px; }
.form-danh-gia input { flex: 1 1 200px; }
.chon-sao { display: flex; }
.sao-nut { border: 0; background: none; font-size: 1.6rem; color: #CFD3E0; cursor: pointer; padding: 0 2px; line-height: 1; }
.sao-nut.chon { color: #E8A100; }
.dl-doi { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 4px 12px; margin: 8px 0; }
.dl-doi dt { color: var(--mo); font-size: .9rem; }
.dl-doi dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }
.ds-chon-tl { display: flex; flex-direction: column; gap: 8px; margin: 8px 0 12px; }
.lua-chon { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: center; background: var(--trang); border: 1px solid var(--vien); border-radius: 10px; padding: 10px 12px; cursor: pointer; }
.lua-chon:has(input:checked) { border-color: var(--chinh); background: var(--chinh-nhat); }
.ds-nhu-cau { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 10px; }
.ds-nhu-cau li { background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); padding: 12px 14px; min-width: 0; box-shadow: var(--bong); }
.ds-chon { padding-left: 20px; }

.trong { background: var(--trang); border: 1px dashed #CDD0E0; border-radius: var(--bo); padding: 24px; text-align: center; color: var(--mo); grid-column: 1 / -1; }
.dang-tai { padding: 8px 0; grid-column: 1 / -1; }
.khung-xuong { height: 18px; background: #E6E7F0; border-radius: 6px; margin: 10px 0; max-width: 520px; }
.khung-xuong.ngan { max-width: 300px; }
.van-ban li { margin-bottom: 6px; }

/* Toast + modal */
#toasts { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; gap: 8px; z-index: 100; width: min(92vw, 480px); }
.toast { background: var(--navy); color: #fff; padding: 12px 16px; border-radius: 10px; box-shadow: 0 8px 24px rgba(30,27,75,.25); border-left: 4px solid var(--teal); }
.toast-loi { background: var(--do); border-left-color: var(--coral-nhat); }
.modal-nen { position: fixed; inset: 0; background: rgba(30, 27, 75, .5); display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 90; }
.modal { background: #fff; border-radius: 14px; padding: 20px; width: min(560px, 100%); max-height: 90vh; overflow: auto; border-top: 5px solid var(--coral); }
.modal-dau { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.modal-dau h2 { margin: 0; }
.nut-x { border: 0; background: none; font-size: 1.6rem; line-height: 1; cursor: pointer; color: var(--mo); padding: 4px 8px; }

.chan-trang { background: var(--navy); color: #C9C6F0; font-size: .9rem; padding: 20px 0; border-top: 4px solid var(--teal); }
.chan-trang a { color: #fff; }
.chan-trang strong { color: #fff; }

/* Màn hình vừa: thu gọn đầu trang để không xuống dòng */
@media (max-width: 1240px) {
  .menu a { padding: 8px 6px; font-size: .9rem; }
  .ten-toi { max-width: 100px; }
  .dau-trong { gap: 8px; }
}
/* ----- Điện thoại / máy tính bảng ----- */
@media (max-width: 1100px) {
  .buoc, .luoi-so { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dong-sua, .dong-sua[data-loai=hoc], .dong-sua.khoa { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dong-sua .rong { grid-column: 1 / -1; }
  .dau-trong { flex-wrap: wrap; gap: 8px; padding-top: 8px; padding-bottom: 8px; }
  .nut-menu { display: inline-flex; margin-left: auto; order: 2; padding: 6px 12px; min-height: 36px; border: 1px solid rgba(255,255,255,.4); border-radius: 8px; background: transparent; color: #fff; font: inherit; font-weight: 600; }
  .logo { order: 1; }
  .tai-khoan { order: 3; width: 100%; flex-wrap: wrap; }
  .menu { order: 4; display: none; flex-direction: column; width: 100%; flex: none; }
  .menu.mo { display: flex; }
  .menu a { padding: 10px 8px; font-size: 1rem; }
  .ten-toi { max-width: 160px; }
  .dau-trang { position: static; }
}
@media (max-width: 760px) {
  .khung { padding: 0 14px; }
  h1 { font-size: 1.45rem; }
  .hero h1 { font-size: 1.8rem; }
  .hero { padding: 28px 0; }
  .ten-giai-thich, .hai-cot, .luoi-form { grid-template-columns: minmax(0, 1fr); }
  .luoi-the { grid-template-columns: minmax(0, 1fr); }
  .dl-doi { grid-template-columns: minmax(0, 1fr); }
  .dl-doi dd { margin-bottom: 6px; }
  /* Bảng → thẻ trên điện thoại */
  .bang thead { display: none; }
  .bang, .bang tbody, .bang tr, .bang td { display: block; width: 100%; }
  .bang tr { border-bottom: 1px solid var(--vien); padding: 6px 0; }
  .bang tbody tr:nth-child(even) { background: transparent; }
  .bang td { border: 0; padding: 4px 12px; display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 8px; }
  .bang td::before { content: attr(data-nhan); color: var(--mo); font-size: .85rem; }
  .cat-chu { max-width: none; }
  .lua-chon { grid-template-columns: auto minmax(0, 1fr); }
  .lua-chon .the { grid-column: 2; justify-self: start; }
}
@media (max-width: 420px) {
  .buoc, .luoi-so { grid-template-columns: minmax(0, 1fr); }
  .luoi-so.nho { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dong-sua, .dong-sua[data-loai=hoc], .dong-sua.khoa { grid-template-columns: minmax(0, 1fr); }
}