/* =====================================================================
   NỀN KHẢO SÁT SocialLife — main.css
   Hướng thiết kế: điềm tĩnh, đáng tin, dễ đọc, ưu tiên điện thoại.
   Đối tượng trả lời gồm người lao động, người chăm sóc, trẻ em -> rõ ràng
   và vùng chạm lớn quan trọng hơn sự cầu kỳ.
   ===================================================================== */
:root {
  --ink: #1c2b33;          /* chữ chính: xanh mực trầm */
  --ink-soft: #4a5a62;
  --paper: #f6f7f5;        /* nền: trắng ngà mát, không vàng kem */
  --card: #ffffff;
  --line: #dfe3e0;
  --primary: #166b6b;      /* xanh teal viện nghiên cứu */
  --primary-d: #0f5050;
  --accent: #c2603a;       /* đất nung, dùng rất tiết chế */
  --ok: #1f7a4d;
  --err: #b23b3b;
  --radius: 12px;
  --maxw: 720px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px; line-height: 1.55;
  padding-bottom: 96px; /* chừa chỗ cho thanh gửi */
}
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 18px; }

.site-header { background: var(--primary); color: #fff; padding: 18px 0 22px; }
.site-header .brand { font-size: 13px; opacity: .9; letter-spacing: .02em; }
.site-header h1 { margin: 6px 0 0; font-size: 22px; font-weight: 700; line-height: 1.25; }

main { padding-top: 18px; }

.block { margin: 26px 0; }
.section-title {
  font-size: 15px; font-weight: 700; color: var(--primary-d);
  text-transform: uppercase; letter-spacing: .04em;
  margin: 0 0 14px; padding-bottom: 8px; border-bottom: 2px solid var(--line);
}

.question {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 16px 8px; margin: 14px 0;
}
.q-text { font-weight: 600; margin-bottom: 4px; }
.q-text .req { color: var(--accent); }
.q-hint { font-size: 14px; color: var(--ink-soft); margin-bottom: 10px; }
.q-body { margin-top: 10px; }

/* phương án chọn: vùng chạm lớn */
.opt {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 10px; border-radius: 10px; cursor: pointer;
  min-height: 44px;
}
.opt:hover { background: #f0f3f1; }
.opt input { width: 22px; height: 22px; margin-top: 1px; accent-color: var(--primary); flex: none; }
.opt.rank { justify-content: space-between; align-items: center; }
.open-text { display: block; margin-top: 6px; width: 100%; }
.rank-sel { min-width: 64px; min-height: 40px; }

/* ma trận thang đo */
.matrix { padding-top: 14px; }
.matrix-anchors { font-size: 13px; color: var(--ink-soft); margin-bottom: 10px; font-style: italic; }
.matrix-row { padding: 10px 0; border-top: 1px solid var(--line); }
.matrix-row:first-of-type { border-top: 0; }
.matrix-label { font-weight: 500; margin-bottom: 8px; }
.seg { display: flex; gap: 8px; flex-wrap: wrap; }
.seg-btn {
  flex: 1 1 0; min-width: 44px; min-height: 46px;
  border: 1.5px solid var(--line); background: #fff; color: var(--ink);
  border-radius: 10px; font: inherit; font-weight: 600; cursor: pointer;
}
.seg-btn:hover { border-color: var(--primary); }
.seg-btn.on { background: var(--primary); border-color: var(--primary); color: #fff; }

/* nhập số / văn bản */
.num, .txt, .open-text, .rank-sel {
  font: inherit; color: var(--ink); background: #fff;
  border: 1.5px solid var(--line); border-radius: 10px; padding: 10px 12px;
}
.num { width: 140px; }
textarea.txt { width: 100%; resize: vertical; }
input.txt { width: 100%; }

/* tiêu điểm bàn phím */
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 8px; }

/* thanh gửi cố định đáy */
.submitbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  background: rgba(255,255,255,.96); border-top: 1px solid var(--line);
  backdrop-filter: blur(6px); padding: 10px 0 calc(10px + env(safe-area-inset-bottom));
}
.bar-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.bar-note { font-size: 13px; color: var(--ink-soft); }
.btn-primary {
  background: var(--primary); color: #fff; border: 0; border-radius: 10px;
  font: inherit; font-weight: 700; padding: 13px 22px; min-height: 48px; cursor: pointer;
}
.btn-primary:hover { background: var(--primary-d); }
.btn-primary:disabled { opacity: .55; cursor: default; }

/* thông báo */
.notice { padding: 14px 16px; border-radius: var(--radius); margin: 14px 0; background: #eef3f1; }
.notice.err { background: #fbeceb; color: var(--err); }
.notice.ok { background: #eaf5ee; color: var(--ok); }
.notice.ok h2 { margin: 0 0 6px; }
.notice code { background: rgba(0,0,0,.06); padding: 1px 6px; border-radius: 6px; }

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

/* ===== Trang chủ workspace (hub) ===== */
.hub { margin-top: 4px; }
.hub-intro { color: var(--ink-soft); margin: 0 0 16px; line-height: 1.55; }
.hub-list { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .hub-list { grid-template-columns: 1fr 1fr; } }
.hub-card {
  display: block; text-decoration: none; color: inherit;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; box-shadow: 0 1px 2px rgba(20,40,40,.05);
  transition: border-color .15s, box-shadow .15s, transform .05s;
}
.hub-card:hover { border-color: var(--primary); box-shadow: 0 4px 14px rgba(15,80,80,.12); }
.hub-card:active { transform: translateY(1px); }
.hub-card-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.hub-title { font-size: 1.12rem; line-height: 1.35; margin: 10px 0 8px; color: var(--ink); }
.hub-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; color: var(--ink-soft); font-size: .9rem; }
.hub-code { font-weight: 600; letter-spacing: .02em; }
.hub-action { color: var(--primary); font-weight: 600; font-size: .92rem; white-space: nowrap; }
.hub-badge { font-size: .8rem; font-weight: 600; padding: 3px 10px; border-radius: 999px; }
.hub-badge.todo  { background: #eef2f0; color: var(--ink-soft); }
.hub-badge.doing { background: #fbe9df; color: var(--accent); }
.hub-badge.done  { background: #e3f3ea; color: var(--ok); }
.hub-tag { display: inline-block; margin-top: 10px; font-size: .8rem; color: var(--ink-soft);
  background: #eef2f0; border-radius: 8px; padding: 3px 9px; }

/* =====================================================================
   NHẬN DIỆN THƯƠNG HIỆU + WORKSPACE (đè lên cuối — quy tắc sau thắng)
   ===================================================================== */
:root{
  --primary:#2e8e8e; --primary-d:#246f6f; --accent:#e79a47;
  --teal-tint:#eef5f4; --teal-line:#cfe3e0;
  --ink:#1b2b30; --ink-soft:#5a6b6e; --line:#e2e7e6; --card:#ffffff;
  --radius:14px;
}
body{ background:var(--paper,#f6f7f5); }

/* ----- Header trắng mang logo ----- */
.site-header{ background:#fff; border-bottom:1px solid var(--line); box-shadow:0 1px 0 rgba(20,40,40,.02); position:sticky; top:0; z-index:20; }
.site-header .header-inner{ display:flex; align-items:center; min-height:64px; padding-top:10px; padding-bottom:10px; }
.brand-logo{ height:40px; width:auto; display:block; }
@media (max-width:560px){ .brand-logo{ height:32px; } .site-header .header-inner{ min-height:54px; } }

/* ----- Khối tiêu đề (hero) ----- */
.hero{ background:linear-gradient(180deg,var(--teal-tint),#fff); border-bottom:1px solid var(--teal-line); }
.hero .wrap{ padding:22px 0 20px; }
.hero-eyebrow{ margin:0 0 4px; color:var(--primary-d); font-weight:600; font-size:.82rem; letter-spacing:.06em; text-transform:uppercase; }
#survey-title{ margin:0; color:var(--ink); font-weight:800; line-height:1.18; font-size:clamp(1.4rem,4.6vw,2rem); }

/* ----- Workspace ----- */
.hub{ margin-top:18px; }
.hub-intro{ color:var(--ink-soft); margin:0 0 18px; line-height:1.6; max-width:62ch; }
.hub-list{ display:grid; gap:14px; grid-template-columns:1fr; }
@media (min-width:720px){ .hub-list{ grid-template-columns:1fr 1fr; } }

.hub-card{ position:relative; display:flex; text-decoration:none; color:inherit; background:var(--card);
  border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  box-shadow:0 1px 2px rgba(20,40,40,.05); transition:border-color .15s, box-shadow .15s, transform .06s; }
.hub-card:hover{ border-color:var(--primary); box-shadow:0 8px 22px rgba(20,90,90,.13); transform:translateY(-1px); }
.hub-card:active{ transform:translateY(0); }
.hub-card:focus-visible{ outline:3px solid var(--primary); outline-offset:2px; }
.hub-rail{ width:6px; flex:0 0 6px; background:var(--line); }
.hub-card--todo  .hub-rail{ background:#b9c6c6; }
.hub-card--doing .hub-rail{ background:var(--accent); }
.hub-card--done  .hub-rail{ background:var(--primary); }
.hub-card-body{ padding:16px 18px; flex:1 1 auto; }
.hub-card-top{ display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:8px; }
.hub-icon{ display:inline-flex; align-items:center; justify-content:center; width:38px; height:38px; border-radius:11px;
  background:var(--teal-tint); color:var(--primary-d); }
.hub-title{ font-size:1.12rem; line-height:1.35; margin:2px 0 10px; color:var(--ink); font-weight:700; }
.hub-meta{ display:flex; flex-wrap:wrap; gap:6px 14px; color:var(--ink-soft); font-size:.9rem; }
.hub-code{ font-weight:600; letter-spacing:.02em; }
.hub-badge{ font-size:.78rem; font-weight:700; padding:4px 11px; border-radius:999px; white-space:nowrap; }
.hub-badge.todo { background:#eef2f1; color:var(--ink-soft); }
.hub-badge.doing{ background:#fbeadb; color:#b9701f; }
.hub-badge.done { background:#e2f1ea; color:#1f7a4d; }
.hub-tag{ display:inline-block; margin-top:12px; font-size:.78rem; color:var(--primary-d);
  background:var(--teal-tint); border:1px solid var(--teal-line); border-radius:8px; padding:3px 9px; }
.hub-cta{ display:block; margin-top:14px; color:var(--primary-d); font-weight:700; font-size:.96rem; }
.hub-empty{ background:var(--card); border:1px dashed var(--teal-line); border-radius:var(--radius);
  padding:18px; color:var(--ink-soft); line-height:1.55; }

/* ----- Bảng nhập mã tham gia ----- */
.codepanel{ margin:26px 0 8px; padding:20px; background:var(--teal-tint); border:1px solid var(--teal-line); border-radius:var(--radius); }
.codepanel-title{ margin:0 0 4px; font-size:1.06rem; font-weight:700; color:var(--ink); }
.codepanel-sub{ margin:0 0 14px; color:var(--ink-soft); line-height:1.55; max-width:60ch; }
.codepanel-row{ display:flex; gap:10px; flex-wrap:wrap; }
.codepanel-input{ flex:1 1 220px; min-width:0; padding:12px 14px; font-size:1.05rem; font-family:inherit;
  border:1.5px solid var(--teal-line); border-radius:10px; background:#fff; color:var(--ink); }
.codepanel-input:focus{ outline:none; border-color:var(--primary); box-shadow:0 0 0 3px rgba(46,142,142,.18); }
.codepanel .btn-primary{ flex:0 0 auto; }
.codepanel-msg{ margin-top:10px; font-size:.92rem; color:var(--ink-soft); min-height:1.2em; }
.codepanel-msg.err{ color:var(--err); }
@media (max-width:520px){ .codepanel-row .btn-primary{ width:100%; } }

/* ----- Chân trang thương hiệu ----- */
.site-footer{ margin-top:40px; border-top:1px solid var(--line); background:#fff; }
.site-footer .footer-inner{ display:flex; align-items:center; gap:14px; padding:18px 0 26px; flex-wrap:wrap; }
.footer-logo{ height:34px; width:auto; }
.footer-text{ color:var(--ink-soft); font-size:.88rem; line-height:1.5; }
.footer-text strong{ color:var(--ink); font-weight:600; }
.footer-text a{ color:var(--primary-d); text-decoration:none; }
.footer-text a:hover{ text-decoration:underline; }

/* ----- Thanh tiến độ trong phiếu ----- */
.progress{ margin:16px 0 6px; }
.progress-track{ height:9px; background:var(--teal-line); border-radius:999px; overflow:hidden; }
.progress-fill{ height:100%; width:0; background:var(--primary); border-radius:999px; transition:width .25s ease; }
.progress-label{ margin-top:7px; font-size:.86rem; color:var(--ink-soft); font-weight:500; }
@media (prefers-reduced-motion: reduce){ .progress-fill{ transition:none; } .hub-card{ transition:none; } }

/* v7 — phần khảo sát gập/mở (accordion) cho gọn phiếu dài */
.section-head {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  font: inherit; cursor: pointer; -webkit-appearance: none; appearance: none;
  background: var(--teal-tint); border: 1px solid var(--teal-line);
  border-radius: 12px; padding: 12px 16px; margin: 0;
}
.section-head:hover { background: #e6f1ef; }
.section-head .section-title { flex: 1; margin: 0; padding: 0; border: 0; }
.section-count { font-size: 13px; font-weight: 700; color: var(--ink-soft); white-space: nowrap; }
.section-chevron { color: var(--primary-d); font-size: 13px; transition: transform .15s ease; }
.block:not(.collapsed) > .section-head .section-chevron { transform: rotate(180deg); }
.block.collapsed .block-body { display: none; }
.block-body { margin-top: 14px; }

/* v8 — báo lỗi tại chỗ cho câu bắt buộc + khả năng tiếp cận */
.question.q-missing { border-color: var(--err); box-shadow: 0 0 0 3px rgba(178, 59, 59, .12); }
.matrix-row.q-missing { outline: 2px solid var(--err); outline-offset: 2px; border-radius: 8px; }
.q-err { display: none; color: var(--err); font-weight: 600; font-size: 13px; margin-top: 8px; }
.question.q-missing .q-err { display: block; }
.opt input:focus-visible, .seg-btn:focus-visible, .num:focus-visible, .txt:focus-visible,
.rank-sel:focus-visible, .open-text:focus-visible, .section-head:focus-visible {
  outline: 2px solid var(--primary); outline-offset: 2px;
}
.opt { min-height: 40px; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }

/* ── Nút điều hướng bổ sung (v10) ───────────────────────────── */
.back-hub{display:inline-flex;align-items:center;gap:6px;margin:2px 0 16px;color:var(--primary);
  background:#fff;border:1.5px solid var(--primary);
  text-decoration:none;font-weight:700;font-size:14px;padding:8px 16px;border-radius:999px;
  box-shadow:0 1px 4px rgba(15,80,80,.14)}
.back-hub:hover{background:var(--primary);color:#fff}
.hub-adminbar{display:flex;align-items:center;justify-content:space-between;gap:14px;
  flex-wrap:wrap;background:#f1f7f6;border:1px solid #d6e6e3;border-radius:14px;
  padding:14px 18px;margin:4px 0 18px}
.hub-admin-note{font-size:14px;color:#34534f;max-width:62ch;line-height:1.5}
.btn-admin{display:inline-flex;align-items:center;white-space:nowrap;background:var(--primary);
  color:#fff;border-radius:10px;padding:11px 18px;font-weight:700;text-decoration:none}
.btn-admin:hover{background:var(--primary-d)}