/* ============================================================
   VietKids — Component styles
   ============================================================ */

/* ---------- Buttons ---------- */
.vk-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--vk-font-display); font-weight: 600; font-size: 15px;
  padding: 11px 22px; border-radius: var(--vk-radius-pill);
  border: 2px solid transparent; cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
  text-decoration: none; line-height: 1.1;
}
.vk-btn:hover { text-decoration: none; }
.vk-btn:active { transform: translateY(1px) scale(0.99); }
.vk-btn-primary { background: var(--vk-blue); color: #fff; box-shadow: var(--vk-shadow-soft); }
.vk-btn-primary:hover { background: var(--vk-blue-dark); box-shadow: var(--vk-shadow-card); }
.vk-btn-coral { background: var(--vk-coral); color: #fff; }
.vk-btn-coral:hover { filter: brightness(0.94); }
.vk-btn-ghost { background: transparent; color: var(--vk-ink); border-color: var(--vk-border-strong); }
.vk-btn-ghost:hover { background: var(--vk-surface-alt); }
.vk-btn-outline { background: var(--vk-surface); color: var(--vk-blue-dark); border-color: var(--vk-blue); }
.vk-btn-outline:hover { background: var(--vk-blue); color: #fff; }
.vk-btn-sm { padding: 7px 16px; font-size: 13.5px; }
.vk-btn-block { width: 100%; }
.vk-btn[disabled] { opacity: 0.55; cursor: not-allowed; }
.vk-btn-icon { padding: 9px; border-radius: var(--vk-radius-pill); aspect-ratio: 1; }

/* ---------- Layout shell ---------- */
.vk-app { min-height: 100vh; display: flex; flex-direction: column; }
.vk-header {
  position: sticky; top: 0; z-index: 40; height: var(--vk-header-h);
  padding-top: env(safe-area-inset-top, 0px);
  background: var(--vk-surface); border-bottom: 1px solid var(--vk-border);
  display: flex; align-items: center;
}
.vk-header-inner {
  width: 100%; max-width: var(--vk-max-w); margin: 0 auto; padding: 0 var(--vk-space-5);
  display: flex; align-items: center; justify-content: space-between; gap: var(--vk-space-4);
}
.vk-brand { display: flex; align-items: center; gap: 9px; font-family: var(--vk-font-display);
  font-weight: 700; font-size: 20px; color: var(--vk-ink); }
.vk-brand-mark {
  width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--vk-blue), var(--vk-purple)); color: #fff; font-size: 19px;
}
.vk-header-actions { display: flex; align-items: center; gap: var(--vk-space-3); }
.vk-avatar {
  width: 36px; height: 36px; border-radius: 50%; background: var(--vk-amber);
  color: #4a3200; display: grid; place-items: center; font-weight: 700; font-family: var(--vk-font-display);
}

.vk-body { display: flex; flex: 1; width: 100%; max-width: var(--vk-max-w); margin: 0 auto; }
.vk-sidebar {
  width: var(--vk-sidebar-w); flex-shrink: 0; padding: var(--vk-space-5) var(--vk-space-3);
  border-right: 1px solid var(--vk-border); display: none;
}
.vk-nav-link {
  display: flex; align-items: center; gap: 11px; padding: 10px 14px; border-radius: var(--vk-radius-md);
  color: var(--vk-ink-soft); font-weight: 600; font-size: 14.5px; margin-bottom: 2px;
}
.vk-nav-link:hover { background: var(--vk-surface-alt); text-decoration: none; color: var(--vk-ink); }
.vk-nav-link.active { background: var(--vk-blue); color: #fff; }
.vk-nav-icon { font-size: 18px; width: 22px; text-align: center; }
.vk-nav-group-label { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--vk-ink-soft); opacity: 0.7; margin: var(--vk-space-4) 14px var(--vk-space-2); }

.vk-main { flex: 1; min-width: 0; padding: var(--vk-space-5); padding-bottom: calc(var(--vk-bottomnav-h) + var(--vk-space-5)); }

@media (min-width: 900px) {
  .vk-sidebar { display: block; }
  .vk-main { padding-bottom: var(--vk-space-6); }
}

.vk-bottom-nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  height: calc(var(--vk-bottomnav-h) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: var(--vk-surface); border-top: 1px solid var(--vk-border);
  display: flex; align-items: stretch; justify-content: space-around;
}
@media (min-width: 900px) { .vk-bottom-nav { display: none; } }
.vk-bottom-link {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px; font-size: 11px; color: var(--vk-ink-soft); font-weight: 600;
}
.vk-bottom-link.active { color: var(--vk-blue-dark); }
.vk-bottom-link .vk-nav-icon { font-size: 21px; }

.vk-footer { text-align: center; padding: var(--vk-space-5); color: var(--vk-ink-soft); font-size: 13px; }

/* ---------- Flash messages ---------- */
.vk-flash-wrap { max-width: var(--vk-max-w); margin: var(--vk-space-4) auto 0; padding: 0 var(--vk-space-5); }
.vk-flash {
  padding: 12px 16px; border-radius: var(--vk-radius-md); margin-bottom: 10px;
  font-weight: 600; font-size: 14px; border: 1px solid transparent;
}
.vk-flash-success { background: #EDF9E1; color: #3A6B0E; border-color: #CDEBAE; }
.vk-flash-danger { background: #FDEDEC; color: #9A2E27; border-color: #F7CFCB; }
.vk-flash-info { background: #EAF3FD; color: #1E5390; border-color: #C9E0F9; }
.vk-flash-warning { background: #FFF6E1; color: #8A5A00; border-color: #FBE3AC; }

/* ---------- Cards ---------- */
.vk-card {
  background: var(--vk-surface); border: 1px solid var(--vk-border);
  border-radius: var(--vk-radius-lg); padding: var(--vk-space-5); box-shadow: var(--vk-shadow-soft);
}
.vk-card-tight { padding: var(--vk-space-4); border-radius: var(--vk-radius-md); }
.vk-grid { display: grid; gap: var(--vk-space-4); }
.vk-grid-2 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.vk-grid-3 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.vk-grid-4 { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }

.vk-stat-card { display: flex; flex-direction: column; gap: 4px; }
.vk-stat-value { font-family: var(--vk-font-display); font-size: 32px; font-weight: 700; }
.vk-stat-label { color: var(--vk-ink-soft); font-size: 13.5px; font-weight: 600; }

.vk-badge {
  display: inline-flex; align-items: center; gap: 5px; padding: 4px 12px; border-radius: var(--vk-radius-pill);
  font-size: 12.5px; font-weight: 700; background: var(--vk-surface-alt); color: var(--vk-ink-soft);
}
.vk-badge-blue { background: #E7F1FC; color: var(--vk-blue-dark); }
.vk-badge-green { background: #ECF8DE; color: #4B7A11; }
.vk-badge-amber { background: #FFF2D9; color: #92620A; }
.vk-badge-coral { background: #FDEAE8; color: #B23A31; }
.vk-badge-purple { background: #F1EAFD; color: #6D3FC4; }

/* ---------- Forms ---------- */
.vk-field { margin-bottom: var(--vk-space-4); }
.vk-label { display: block; font-weight: 700; font-size: 13.5px; margin-bottom: 6px; color: var(--vk-ink); }
.vk-input, .vk-select, textarea.vk-input {
  width: 100%; padding: 11px 14px; border-radius: var(--vk-radius-sm); border: 1.5px solid var(--vk-border-strong);
  background: var(--vk-surface); color: var(--vk-ink); font-size: 15px; font-family: var(--vk-font-body);
}
.vk-input:focus, .vk-select:focus, textarea.vk-input:focus { border-color: var(--vk-blue); }
.vk-help { font-size: 12.5px; color: var(--vk-ink-soft); margin-top: 4px; }
.vk-error { font-size: 12.5px; color: var(--vk-danger); margin-top: 4px; font-weight: 600; }
.vk-form-narrow { max-width: 400px; }
.vk-checkbox-row { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; }

/* ---------- Auth pages ---------- */
.vk-auth-wrap {
  min-height: calc(100vh - var(--vk-header-h)); display: grid; place-items: center; padding: var(--vk-space-6) var(--vk-space-4);
}
.vk-auth-card { width: 100%; max-width: 420px; }

/* ---------- Wizard ---------- */
.vk-wizard-steps { display: flex; gap: 6px; margin-bottom: var(--vk-space-5); overflow-x: auto; padding-bottom: 4px; }
.vk-wizard-step {
  flex: 1; min-width: 78px; text-align: center; font-size: 11.5px; font-weight: 700;
  color: var(--vk-ink-soft); padding-bottom: 10px; border-bottom: 3px solid var(--vk-border); white-space: nowrap;
}
.vk-wizard-step.active { color: var(--vk-blue-dark); border-color: var(--vk-blue); }
.vk-wizard-step.done { color: var(--vk-green); border-color: var(--vk-green); }

.vk-pick-card {
  border: 2px solid var(--vk-border); border-radius: var(--vk-radius-md); padding: var(--vk-space-4);
  cursor: pointer; background: var(--vk-surface); transition: border-color 0.12s ease, transform 0.12s ease;
  display: flex; flex-direction: column; gap: 4px;
}
.vk-pick-card:hover { border-color: var(--vk-border-strong); transform: translateY(-2px); }
.vk-pick-card input { position: absolute; opacity: 0; pointer-events: none; }
.vk-pick-card.selected { border-color: var(--vk-blue); background: #F2F8FE; }
.vk-pick-emoji { font-size: 30px; }
.vk-pick-title { font-family: var(--vk-font-display); font-weight: 700; font-size: 15.5px; }
.vk-pick-sub { font-size: 12.5px; color: var(--vk-ink-soft); }

.vk-wizard-actions { display: flex; justify-content: space-between; margin-top: var(--vk-space-5); gap: 10px; }
.vk-summary-box {
  background: var(--vk-surface-alt); border-radius: var(--vk-radius-md); padding: var(--vk-space-4);
  font-size: 13.5px; margin-bottom: var(--vk-space-4);
}
.vk-summary-box dt { font-weight: 700; color: var(--vk-ink-soft); }
.vk-summary-box dd { margin: 0 0 8px; }

/* ---------- Worksheet preview ---------- */
.vk-preview-toolbar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: var(--vk-space-4); }
.vk-question-group { margin-bottom: var(--vk-space-5); }
.vk-question-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.vk-question-item { background: var(--vk-surface-alt); border-radius: var(--vk-radius-sm); padding: 9px 12px; font-size: 14px; }
.vk-question-answer { color: var(--vk-green); font-weight: 700; font-size: 12.5px; margin-top: 3px; }

/* ---------- Tables ---------- */
.vk-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.vk-table th { text-align: left; font-size: 12px; color: var(--vk-ink-soft); font-weight: 700;
  padding: 8px 10px; border-bottom: 2px solid var(--vk-border); }
.vk-table td { padding: 10px; border-bottom: 1px solid var(--vk-border); vertical-align: middle; }
.vk-table-wrap { overflow-x: auto; border-radius: var(--vk-radius-md); border: 1px solid var(--vk-border); }

/* ---------- Empty state ---------- */
.vk-empty { text-align: center; padding: var(--vk-space-7) var(--vk-space-4); color: var(--vk-ink-soft); }
.vk-empty-emoji { font-size: 44px; margin-bottom: var(--vk-space-3); }

/* ---------- Pagination ---------- */
.vk-pagination { display: flex; gap: 6px; justify-content: center; margin-top: var(--vk-space-5); }
.vk-pagination a, .vk-pagination span {
  min-width: 34px; height: 34px; display: grid; place-items: center; border-radius: var(--vk-radius-sm);
  font-weight: 700; font-size: 13px; border: 1px solid var(--vk-border);
}
.vk-pagination .current { background: var(--vk-blue); color: #fff; border-color: var(--vk-blue); }

/* ---------- Utility ---------- */
.vk-flex { display: flex; align-items: center; gap: 10px; }
.vk-flex-between { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.vk-mt-5 { margin-top: var(--vk-space-5); }
.vk-mt-6 { margin-top: var(--vk-space-6); }
.vk-muted { color: var(--vk-ink-soft); }
.vk-text-sm { font-size: 13px; }