/*
 * Design system thuần CSS cho hub.congdongxanh.edu.vn — biên soạn thủ công dựa
 * trên design tokens của website chính congdongxanh-web (không nhúng Tailwind
 * runtime, không phụ thuộc CDN font). Xem DOCS/UI_NAVIGATION_IMPLEMENTATION_PLAN.md.
 */

:root {
  --cdx-bg: #fbfaf6;
  --cdx-surface: #ffffff;
  --cdx-text: #14312f;
  --cdx-muted: #6b7280;
  --cdx-brand: #188e90;
  --cdx-brand-dark: #106365;
  --cdx-brand-deep: #0b4547;
  --cdx-brand-soft: #e7f5f5;
  --cdx-accent: #f79820;
  --cdx-accent-dark: #d97706;
  --cdx-success: #1b7a3d;
  --cdx-success-soft: #e7f5ec;
  --cdx-danger: #b00020;
  --cdx-danger-soft: #fbe9ec;
  --cdx-warning: #8a4b00;
  --cdx-warning-soft: #fdf0dc;
  --cdx-border: #d9e7e6;
  --cdx-radius-sm: 8px;
  --cdx-radius-md: 16px;
  --cdx-radius-lg: 28px;
  --cdx-shadow: 0 10px 30px rgba(20, 49, 47, 0.08);
  --cdx-content: 1152px;
  --cdx-header-h: 64px;
}

/* ---------- Reset / base ---------- */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body.site-body {
  margin: 0;
  background: var(--cdx-bg);
  color: var(--cdx-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--cdx-brand-dark); }
a:hover { color: var(--cdx-brand); }

h1, h2, h3 { color: var(--cdx-brand-deep); line-height: 1.25; }
h1 { font-size: 1.5rem; margin: 0 0 .6em; }
h2 { font-size: 1.15rem; margin: 1.6em 0 .6em; }
h3 { font-size: 1rem; margin: 1.4em 0 .5em; }

:focus-visible {
  outline: 3px solid var(--cdx-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: no-preference) {
  .site-nav__link, .btn, .hamburger { transition: background-color .15s ease, color .15s ease; }
}

/* ---------- Layout shell ---------- */

.page-shell {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--cdx-content);
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.page-shell--narrow { max-width: 480px; }
.page-shell--full { max-width: none; padding-left: 0; padding-right: 0; }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--cdx-border);
}

.site-header__bar {
  max-width: var(--cdx-content);
  margin: 0 auto;
  padding: 0 16px;
  min-height: var(--cdx-header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 4px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--cdx-text);
  padding: 8px 0;
}

.site-brand__logo { width: 40px; height: 40px; flex-shrink: 0; }
.site-brand__text { line-height: 1.2; }
.site-brand__title { display: block; font-weight: 800; color: var(--cdx-brand-dark); }
.site-brand__subtitle { display: block; font-size: .7rem; color: var(--cdx-muted); }

.hamburger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--cdx-radius-sm);
  border: 1px solid transparent;
  background: none;
  color: var(--cdx-brand-deep);
  cursor: pointer;
}
.hamburger:hover { background: var(--cdx-brand-soft); }

/* ---------- Nav ---------- */

.site-nav[hidden] { display: none; }
.site-nav {
  width: 100%;
  flex-basis: 100%;
  order: 10;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 0 16px;
  border-top: 1px solid var(--cdx-border);
}

.site-nav__group { display: flex; flex-direction: column; gap: 2px; }
.site-nav__group + .site-nav__group { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--cdx-border); }
.site-nav__group--actions { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--cdx-border); }

.site-nav__group-label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--cdx-muted);
  padding: 6px 12px 2px;
}

.site-nav__link {
  display: block;
  padding: 12px;
  min-height: 44px;
  border-radius: var(--cdx-radius-sm);
  text-decoration: none;
  color: var(--cdx-text);
  font-weight: 600;
  font-size: .95rem;
  border: none;
  background: none;
  text-align: left;
  width: 100%;
  cursor: pointer;
  font-family: inherit;
}
.site-nav__link:hover { background: var(--cdx-brand-soft); color: var(--cdx-brand-dark); }
.site-nav__link[aria-current="page"] { background: var(--cdx-brand); color: #fff; }
.site-nav__link[aria-current="page"]:hover { color: #fff; }

.site-nav__link--external { color: var(--cdx-brand-dark); }
.site-nav__link--cta { background: var(--cdx-brand); color: #fff; text-align: center; }
.site-nav__link--cta:hover { background: var(--cdx-brand-dark); color: #fff; }
.site-nav__link--button { color: var(--cdx-danger); }
.site-nav__logout-form { margin: 0; }

/* Dropdown (nhóm CÓ nhãn, VD "Vận hành") — nút bấm chỉ có tác dụng/hiển thị ở
   desktop; trên mobile bị ẩn hẳn (display:none) nên .nav-dropdown__menu luôn ở
   trạng thái hiển thị bình thường trong luồng, giống mọi .site-nav__group khác. */
.nav-dropdown { position: relative; }
.nav-dropdown__trigger { display: none; }

@media (min-width: 768px) {
  .hamburger { display: none; }

  .site-nav, .site-nav[hidden] {
    display: flex;
    flex-basis: auto;
    order: 0;
    width: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 2px;
    padding: 0;
    border-top: none;
  }

  .site-nav__group { flex-direction: row; align-items: center; gap: 2px; }
  .site-nav__group + .site-nav__group,
  .site-nav__group--actions {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    padding-left: 10px;
    margin-left: 6px;
    border-left: 1px solid var(--cdx-border);
  }
  .site-nav__group-label { padding: 0 4px 0 0; }
  .site-nav__link { width: auto; min-height: 0; padding: 8px 14px; border-radius: 999px; }

  /* Desktop: ẩn nhãn tĩnh, thay bằng nút dropdown cùng chữ + mũi tên. */
  .nav-dropdown .site-nav__group-label { display: none; }
  .nav-dropdown__trigger {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    min-height: 0;
    padding: 8px 14px;
    border-radius: 999px;
    border: none;
    background: none;
    color: var(--cdx-muted);
    font: inherit;
    font-weight: 700;
    font-size: .82rem;
    letter-spacing: .02em;
    cursor: pointer;
  }
  .nav-dropdown__trigger:hover,
  .nav-dropdown__trigger[aria-expanded="true"] { background: var(--cdx-brand-soft); color: var(--cdx-brand-dark); }
  .nav-dropdown__caret { font-size: .7em; }

  .nav-dropdown__menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 210px;
    background: var(--cdx-surface);
    border: 1px solid var(--cdx-border);
    border-radius: var(--cdx-radius-sm);
    box-shadow: var(--cdx-shadow);
    padding: 6px;
    z-index: 50;
  }
  .nav-dropdown.is-open .nav-dropdown__menu { display: flex; }
  .nav-dropdown__menu .site-nav__link {
    width: 100%;
    border-radius: var(--cdx-radius-sm);
    color: var(--cdx-text);
    text-align: left;
  }
}

/* ---------- Footer ---------- */

.site-footer {
  flex-shrink: 0;
  background: var(--cdx-brand-deep);
  color: #eafaf7;
  margin-top: 48px;
}
.site-footer__inner {
  max-width: var(--cdx-content);
  margin: 0 auto;
  padding: 28px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.site-footer a { color: #c7ece9; }
.site-footer__col p { margin: .4em 0 0; color: #b7d8d4; font-size: .9rem; }
.site-footer__col { display: flex; flex-direction: column; gap: 6px; }

@media (min-width: 768px) {
  .site-footer__inner { flex-direction: row; justify-content: space-between; }
  .site-footer__col--nav { flex-direction: row; gap: 20px; align-items: center; }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: .95rem;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
}

.btn--primary { background: var(--cdx-brand); color: #fff; }
.btn--primary:hover { background: var(--cdx-brand-dark); color: #fff; }

.btn--accent { background: var(--cdx-accent); color: #fff; }
.btn--accent:hover { background: var(--cdx-accent-dark); color: #fff; }

.btn--secondary { background: var(--cdx-surface); color: var(--cdx-brand-dark); border-color: var(--cdx-border); }
.btn--secondary:hover { background: var(--cdx-brand-soft); }

.btn--danger { background: var(--cdx-surface); color: var(--cdx-danger); border-color: var(--cdx-danger); }
.btn--danger:hover { background: var(--cdx-danger-soft); }

.btn--block { width: 100%; }
.btn--sm { min-height: 36px; padding: 6px 14px; font-size: .85rem; }

/* ---------- Cards ---------- */

.card {
  background: var(--cdx-surface);
  border: 1px solid var(--cdx-border);
  border-radius: var(--cdx-radius-md);
  box-shadow: var(--cdx-shadow);
  padding: 20px;
}
.card + .card { margin-top: 16px; }
.card > h1:first-child, .card > h2:first-child, .card > h3:first-child { margin-top: 0; }
.card--center { text-align: center; }

/* ---------- Alerts ---------- */

.alert {
  border-radius: var(--cdx-radius-sm);
  padding: 12px 16px;
  margin: 0 0 16px;
  font-size: .92rem;
  border: 1px solid transparent;
}
.alert--success { background: var(--cdx-success-soft); color: var(--cdx-success); border-color: #bfe3cc; }
.alert--error { background: var(--cdx-danger-soft); color: var(--cdx-danger); border-color: #f0c1cb; }
.alert--warning { background: var(--cdx-warning-soft); color: var(--cdx-warning); border-color: #f2ddb3; }
.alert--info { background: var(--cdx-brand-soft); color: var(--cdx-brand-deep); border-color: var(--cdx-border); }

/* ---------- Forms ---------- */

.form-group { margin: 0 0 16px; }
.form-group label,
.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: .9rem;
  color: var(--cdx-brand-deep);
}
.form-control,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="datetime-local"],
select,
textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--cdx-border);
  border-radius: var(--cdx-radius-sm);
  background: var(--cdx-surface);
  color: var(--cdx-text);
  font-size: 1rem;
  font-family: inherit;
}
textarea { min-height: 88px; }
.form-help { font-size: .8rem; color: var(--cdx-muted); margin-top: 4px; }
.form-actions { margin-top: 20px; }
.form-inline { display: inline; margin: 0; }
.form-group--inline { margin: 0; }
.form-row {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  align-items: center;
}
.input-grow { flex: 1; min-width: 180px; }
.input-compact { width: 140px; flex: none; }

fieldset { border: 1px solid var(--cdx-border); border-radius: var(--cdx-radius-sm); padding: 12px 16px; margin: 0 0 16px; }
legend { font-weight: 700; color: var(--cdx-brand-deep); padding: 0 6px; }

/* ---------- Tables ---------- */

.table-scroll { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--cdx-surface);
}

/* Bảng nhiều cột (danh sách quản trị) cần bề rộng tối thiểu để không bị bóp chữ —
   .table-scroll xử lý scroll ngang khi đó. Bảng ít cột (VD điều kiện lên chặng ở
   trang cá nhân) không nên bị ép min-width, kẻo tràn ngang không cần thiết. */
.data-table--wide { min-width: 560px; }
.data-table th, .data-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--cdx-border);
  font-size: .9rem;
}
.data-table th {
  background: var(--cdx-brand-soft);
  color: var(--cdx-brand-deep);
  font-weight: 700;
  white-space: nowrap;
}
.data-table tbody tr:hover { background: #f6fbfa; }

/* ---------- Badges ---------- */

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 700;
}
.badge--active { background: var(--cdx-success-soft); color: var(--cdx-success); }
.badge--muted { background: #eef0ef; color: var(--cdx-muted); }
.badge--danger { background: var(--cdx-danger-soft); color: var(--cdx-danger); }
.badge--warning { background: var(--cdx-warning-soft); color: var(--cdx-warning); }

/* ---------- Utility ---------- */

.text-muted { color: var(--cdx-muted); }
.text-success { color: var(--cdx-success); }
.text-warning { color: var(--cdx-warning); }
.text-center { text-align: center; }
.mt-lg { margin-top: 2em; }
.stack { display: flex; flex-direction: column; gap: 10px; }
.cluster { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.empty-note { color: var(--cdx-muted); font-style: italic; }
.achievements-list { padding-left: 1.2em; }

/* ---------- Trang chủ / QR check-in (card đơn, CTA full width) ---------- */

.hero-card {
  max-width: 480px;
  margin: 40px auto;
  text-align: center;
}
.hero-card .hero-icon { font-size: 3rem; }

.checkin-card { max-width: 420px; margin: 40px auto; text-align: center; }

/* ---------- Trang cá nhân (cây theo cấp / hành trình) ---------- */

.seed-tree { text-align: center; background: var(--cdx-brand-soft); border-radius: var(--cdx-radius-md); padding: 24px; }
.seed-tree .icon { font-size: 3rem; }
.seed-tree h2 { margin: .2em 0; }

.journey { text-align: center; margin: 24px 0; }
.journey .dots { font-size: 1.4rem; letter-spacing: 2px; color: var(--cdx-success); word-break: break-all; }
.journey .chain { font-size: .8rem; color: var(--cdx-muted); margin-top: .5em; }
.journey .chain b { color: var(--cdx-brand); }

.tiles { display: flex; gap: 10px; margin: 1em 0; flex-wrap: wrap; }
.tile { flex: 1 1 100px; text-align: center; background: var(--cdx-brand-soft); border-radius: var(--cdx-radius-sm); padding: 12px; }
.tile b { font-size: 1.3rem; display: block; color: var(--cdx-brand-dark); }

/* ---------- Bảng vinh danh ---------- */

.board-grid { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin-top: 24px; }
.board-card { background: var(--cdx-surface); border-radius: var(--cdx-radius-md); padding: 16px; text-align: center; width: 140px; box-shadow: var(--cdx-shadow); }
.board-card .icon { font-size: 2rem; }
.board-card .name { font-weight: 700; margin: .3em 0; }
.board-card .level { color: var(--cdx-success); font-size: .85rem; }
.board-card .month { color: var(--cdx-muted); font-size: .75rem; margin-top: .3em; }

.growth-row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 24px; }
.growth-card { background: var(--cdx-surface); border-radius: var(--cdx-radius-sm); padding: 12px; width: 150px; text-align: center; font-size: .85rem; box-shadow: var(--cdx-shadow); }
.growth-card .icon { font-size: 1.6rem; }
.board-page-title { text-align: center; }
.board-lead { text-align: center; }