/* NDH Academy — Logged-in home shell: sidebar + header + widget column */

/* ===== Shell layout ===== */
.app-shell { display: flex; min-height: 100vh; background: var(--bg-page); }

/* ===== Sidebar ===== */
.sidebar {
  width: 232px; flex-shrink: 0;
  background: var(--color-neutral-900);
  color: var(--text-inverse-secondary);
  padding: var(--space-6) var(--space-4);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  z-index: 60;
}
.sidebar > * { flex-shrink: 0; }
.sidebar-brand { display: flex; align-items: center; gap: var(--space-3); padding: 0 var(--space-2) var(--space-6); }
.sidebar-brand .brand__name, .sidebar-brand .brand__tagline { color: var(--text-inverse); }
.sidebar-brand .brand__tagline { color: var(--text-inverse-secondary); }

.sidebar-label {
  font-size: 11px; font-weight: var(--font-weight-semibold); letter-spacing: 0.08em; text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  padding: var(--space-4) var(--space-2) var(--space-2);
}
.sidebar-nav { display: flex; flex-direction: column; gap: 2px; }
.sidebar-nav a {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--text-inverse-secondary);
  border-left: 2px solid transparent;
  transition: background var(--duration-micro) var(--ease-out), color var(--duration-micro) var(--ease-out);
}
.sidebar-nav a svg { width: 18px; height: 18px; flex-shrink: 0; }
.sidebar-nav a:hover { background: rgba(255,255,255,0.06); color: #fff; }
.sidebar-nav a.is-active { background: rgba(99,102,241,0.14); color: var(--color-primary-300); border-left-color: var(--color-primary-400); }

.sidebar-categories { display: flex; flex-direction: column; gap: 2px; }
.sidebar-categories a {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--text-inverse-secondary);
}
.sidebar-categories a svg { width: 16px; height: 16px; flex-shrink: 0; opacity: 0.8; }
.sidebar-categories a:hover { background: rgba(255,255,255,0.06); color: #fff; }

/* Thẻ nâng cấp gói Pro */
.sidebar-upgrade {
  margin-top: auto;
  background: linear-gradient(155deg, var(--color-primary-600), var(--color-primary-800));
  border-radius: var(--radius-md);
  padding: var(--space-4);
  position: relative;
  overflow: hidden;
}
.sidebar-upgrade::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(120px 90px at 100% 0%, rgba(255,255,255,0.18), transparent 70%);
}
.sidebar-upgrade__icon { position: relative; margin-bottom: var(--space-2); }
.sidebar-upgrade h4 { position: relative; color: #fff; font-size: var(--font-size-sm); font-family: var(--font-body); margin: 0; }
.sidebar-upgrade p { position: relative; font-size: 12px; color: rgba(255,255,255,0.75); margin-top: var(--space-1); line-height: 1.5; }
.sidebar-upgrade .btn { position: relative; margin-top: var(--space-3); background: #fff; color: var(--color-primary-700); width: 100%; }
.sidebar-upgrade .btn:hover { background: var(--color-neutral-100); }

.sidebar-footer { padding-top: var(--space-4); margin-top: var(--space-4); border-top: 1px solid rgba(255,255,255,0.08); display: flex; flex-direction: column; gap: 2px; }
.sidebar-footer a {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--text-inverse-secondary);
}
.sidebar-footer a svg { width: 18px; height: 18px; flex-shrink: 0; }
.sidebar-footer a:hover { background: rgba(255,255,255,0.06); color: #fff; }
.sidebar-toggle-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-2) var(--space-3); font-size: var(--font-size-sm); color: var(--text-inverse-secondary);
}
.switch { position: relative; width: 38px; height: 22px; flex-shrink: 0; }
.switch input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.switch__track { position: absolute; inset: 0; background: rgba(255,255,255,0.16); border-radius: var(--radius-full); transition: background var(--duration-micro); }
.switch__track::before { content: ''; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; background: #fff; border-radius: 50%; transition: transform var(--duration-micro) var(--ease-out); }
.switch input:checked + .switch__track { background: var(--color-primary-500); }
.switch input:checked + .switch__track::before { transform: translateX(16px); }

.sidebar-toggle { display: none; }

@media (max-width: 1200px) {
  .sidebar { position: fixed; left: -280px; top: 0; transition: left var(--duration-page) var(--ease-out); }
  .sidebar.is-open { left: 0; }
  .sidebar-toggle { display: inline-flex; }
  .sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(10,9,6,0.5); z-index: 55; }
  .sidebar-backdrop.is-open { display: block; }
}

/* ===== Main column / header ===== */
.main-col { flex: 1; min-width: 0; }
.app-header {
  position: sticky; top: 0; z-index: 40;
  background: var(--bg-header);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-default);
}
.app-header__row { display: flex; align-items: center; gap: var(--space-4); height: 80px; padding-inline: var(--space-8); max-width: 1680px; margin-inline: auto; }
.category-dropdown {
  display: flex; align-items: center; gap: var(--space-2);
  height: 44px; padding-inline: var(--space-4);
  border: 1px solid var(--border-default); border-radius: var(--radius-md);
  font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  flex-shrink: 0; background: none;
}
.category-menu { position: relative; flex-shrink: 0; }
.category-dropdown__chevron { transition: transform var(--duration-micro) var(--ease-out); }
[aria-expanded='true'] > .category-dropdown__chevron { transform: rotate(180deg); }
.category-dropdown[aria-expanded='true'] { border-color: var(--color-primary-400); }
.category-menu__panel {
  display: none;
  position: absolute; top: calc(100% + 8px); left: 0; z-index: 45;
  width: 260px; padding: var(--space-2);
  background: var(--bg-page); border: 1px solid var(--border-default); border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}
.category-menu__panel.is-open { display: block; }
.category-menu__panel a {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}
.category-menu__panel a:hover { background: var(--bg-surface); }
.category-menu__panel .cat-icon { width: 32px; height: 32px; }
.category-menu__panel .cat-icon svg { width: 16px; height: 16px; }

.app-header .header-search { max-width: 420px; }
.app-header .header-search button {
  position: absolute; right: var(--space-4); top: 50%; transform: translateY(-50%);
  display: flex; align-items: center; justify-content: center;
  width: 16px; height: 16px; padding: 0; border: none; background: none; color: inherit; cursor: pointer;
}
.app-header .header-search button svg { position: static; top: auto; right: auto; transform: none; }
.link-quiet { font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); color: var(--text-secondary); white-space: nowrap; }
.link-quiet:hover { color: var(--text-primary); }
.user-menu-wrap { position: relative; flex-shrink: 0; }
.user-menu { display: flex; align-items: center; gap: var(--space-2); padding-left: var(--space-3); border-left: 1px solid var(--border-default); }
.user-menu .avatar { width: 40px; height: 40px; font-size: 14px; }
.user-menu__name { display: block; font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); line-height: 1.2; }
.user-menu__role { font-size: 12px; color: var(--text-secondary); }
.user-menu svg { width: 14px; height: 14px; color: var(--text-secondary); margin-left: 2px; }

.user-menu__panel {
  display: none;
  position: absolute; top: calc(100% + 8px); right: 0; z-index: 45;
  width: 240px; padding: var(--space-2);
  background: var(--bg-page); border: 1px solid var(--border-default); border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}
.user-menu__panel.is-open { display: block; }
.user-menu__panel a {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}
.user-menu__panel a svg { width: 18px; height: 18px; color: var(--text-secondary); flex-shrink: 0; }
.user-menu__panel a:hover { background: var(--bg-surface); }
.user-menu__divider { height: 1px; background: var(--border-default); margin: var(--space-2) var(--space-1); }
.user-menu__danger { color: var(--color-error); }
.user-menu__danger svg { color: var(--color-error); }

@media (max-width: 1200px) {
  .app-header__row { padding-inline: var(--space-4); }
  .category-dropdown span, .link-quiet { display: none; }
}
@media (max-width: 860px) {
  .app-header .header-search { display: none; }
}
@media (max-width: 640px) {
  .user-menu__name, .user-menu__role, .user-menu svg { display: none; }
}

.content-pad { padding: var(--space-12) var(--space-8); max-width: 1680px; margin-inline: auto; }
@media (max-width: 640px) { .content-pad { padding: var(--space-6) var(--space-4); } }

/* Nhịp khoảng cách thoáng cho trang dashboard — margin-top (không cộng dồn 2 lớp padding trên/dưới) */
.dash-section { margin-top: var(--space-16); }
.dash-title { font-size: var(--font-size-3xl); }
@media (max-width: 640px) { .dash-section { margin-top: var(--space-12); } }

/* ===== Home layout: main + aside widgets =====
   Cột phụ co giãn theo % chiều rộng khả dụng (không cố định cứng),
   để tự nhỏ lại đúng ở dải màn hình laptop 13-15" (~1200-1440px)
   nơi sidebar + cột phụ dễ chèn ép cột nội dung chính nhất. */
.home-layout { display: grid; grid-template-columns: minmax(0, 1fr) clamp(200px, 17vw, 256px); gap: var(--space-6); align-items: start; }
@media (max-width: 1200px) { .home-layout { grid-template-columns: minmax(0, 1fr); } }
.home-main, .home-aside { min-width: 0; }
/* home-main co giãn theo sidebar + cột phụ, không phải theo viewport thô —
   các lưới bên trong (profile-stats, plan-grid...) phải phản ứng theo chiều rộng
   THẬT của cột này (container query), tránh vỡ layout khi viewport rộng nhưng
   cột nội dung bị sidebar/aside bóp hẹp. */
.home-main { container-type: inline-size; container-name: home-main; }

/* Hero (card, inset within content column) */
.home-hero {
  position: relative;
  background: var(--color-neutral-900);
  color: var(--text-inverse);
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: var(--space-16);
}
.home-hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(500px 360px at 90% 10%, rgba(99,102,241,0.18), transparent 70%);
  pointer-events: none;
}
.home-hero__grid { position: relative; display: grid; grid-template-columns: 1.2fr 0.8fr; gap: var(--space-12); align-items: center; }
.home-hero__title { font-size: clamp(28px, 3vw, 40px); }
.home-hero__title em { color: var(--color-primary-400); font-style: normal; }
.home-hero__desc { margin-top: var(--space-3); color: var(--text-inverse-secondary); max-width: 440px; }
.home-hero__search { margin-top: var(--space-6); max-width: 420px; position: relative; }
.home-hero__search input {
  width: 100%; height: 52px; border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.16); background: rgba(255,255,255,0.06);
  color: #fff; padding-inline: var(--space-4) 52px; font-size: var(--font-size-sm); font-family: inherit;
}
.home-hero__search input::placeholder { color: rgba(255,255,255,0.5); }
.home-hero__search button {
  position: absolute; right: 6px; top: 6px; bottom: 6px; width: 40px;
  border: none; border-radius: var(--radius-sm); background: var(--color-primary-600);
  color: var(--text-inverse); display: flex; align-items: center; justify-content: center;
}
.home-hero__stats { display: flex; gap: var(--space-8); margin-top: var(--space-8); }
.home-hero__stats .stat__value { color: var(--text-inverse); font-size: var(--font-size-2xl); }
.home-hero__stats .stat__label { color: var(--text-inverse-secondary); }

.home-hero__visual { position: relative; aspect-ratio: 1/1; }
.home-hero__frame {
  position: absolute; inset: 0; border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.14);
  background: linear-gradient(160deg, rgba(255,255,255,0.07), rgba(255,255,255,0.01));
  display: flex; align-items: center; justify-content: center;
}
.home-hero__frame svg { width: 40%; color: rgba(129,140,248,0.5); }
.home-hero__frame .ndh-image-placeholder { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; }
.home-hero__frame-photo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border-radius: inherit; }
@media (max-width: 900px) {
  .home-hero__grid { grid-template-columns: minmax(0,1fr); }
  .home-hero__visual { max-width: 260px; width: 100%; margin-inline: auto; }
}
@media (max-width: 640px) { .home-hero { padding: var(--space-6); } }

/* Aside widgets */
.widget { background: var(--bg-page); border: 1px solid var(--border-default); border-radius: var(--radius-lg); padding: var(--space-6); }
/* Cột phụ luôn hẹp (~200-256px) — chữ dài không có khoảng trắng (email, URL...)
   phải tự ngắt dòng thay vì tràn/bị cắt ở mép widget. */
.widget, .widget * { overflow-wrap: anywhere; }
/* .tabs mặc định canh cho khu vực rộng (margin-right 24px, cuộn ngang) — trong
   cột phụ hẹp (~200-256px) phải tự xuống dòng thay vì tràn/cắt chữ. */
.widget .tabs { flex-wrap: wrap; overflow-x: visible; row-gap: var(--space-2); margin-bottom: var(--space-4); }
.widget .tabs button { margin-right: var(--space-4); }
.widget + .widget { margin-top: var(--space-8); }
.widget__head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; row-gap: var(--space-2); margin-bottom: var(--space-5, 20px); }
.widget__head h3 { font-family: var(--font-body); font-size: var(--font-size-base); font-weight: var(--font-weight-semibold); min-width: 0; }
.widget__head a { font-size: var(--font-size-sm); color: var(--color-primary-600); font-weight: var(--font-weight-medium); }

.continue-item { display: flex; gap: var(--space-3); padding-block: var(--space-3); }
.continue-item + .continue-item { border-top: 1px solid var(--border-default); }
.continue-item__icon { width: 40px; height: 40px; border-radius: var(--radius-sm); background: var(--color-neutral-900); color: var(--color-primary-400); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.continue-item__icon svg { width: 18px; height: 18px; }
.continue-item__body { flex: 1; min-width: 0; }
.continue-item__title { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); }
.continue-item__lesson { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }
.continue-item .progress { margin-top: var(--space-2); }

/* Calendar widget */
.calendar__nav { display: flex; align-items: center; gap: var(--space-2); }
.calendar__nav button { width: 28px; height: 28px; border-radius: var(--radius-sm); border: 1px solid var(--border-default); background: none; display: flex; align-items: center; justify-content: center; }
.calendar__grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; text-align: center; }
.calendar__grid .dow { font-size: 11px; color: var(--text-secondary); font-weight: var(--font-weight-semibold); padding-block: var(--space-2); }
.calendar__grid .day { font-size: 13px; padding-block: var(--space-2); border-radius: var(--radius-sm); color: var(--text-primary); }
.calendar__grid .day.is-muted { color: var(--color-neutral-300); }
.calendar__grid .day.is-today { background: var(--color-primary-600); color: var(--text-inverse); font-weight: var(--font-weight-bold); }

/* Activity feed */
.activity-item { display: flex; gap: var(--space-3); padding-block: var(--space-3); }
.activity-item + .activity-item { border-top: 1px solid var(--border-default); }
.activity-item__icon { width: 32px; height: 32px; border-radius: var(--radius-full); background: var(--bg-surface); color: var(--color-primary-600); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.activity-item__icon svg { width: 15px; height: 15px; }
.activity-item p { font-size: var(--font-size-sm); }
.activity-item time { font-size: 12px; color: var(--text-secondary); }

/* Promo widget with countdown */
.promo-widget { background: var(--color-neutral-900); color: var(--text-inverse); position: relative; overflow: hidden; }
.promo-widget::before { content: ''; position: absolute; inset: 0; background: radial-gradient(240px 160px at 100% 0%, rgba(99,102,241,0.28), transparent 70%); }
.promo-widget * { position: relative; }
.promo-widget h3 { font-family: var(--font-heading); font-size: var(--font-size-xl); color: var(--text-inverse); }
.promo-widget p { font-size: var(--font-size-sm); color: var(--text-inverse-secondary); margin-top: var(--space-2); }
.countdown { display: flex; gap: var(--space-2); margin-top: var(--space-5, 20px); }
.countdown__unit { flex: 1; text-align: center; background: rgba(255,255,255,0.08); border-radius: var(--radius-sm); padding: var(--space-2) 0; }
.countdown__unit strong { display: block; font-size: var(--font-size-lg); font-family: var(--font-heading); }
.countdown__unit span { font-size: 10px; color: var(--text-inverse-secondary); text-transform: uppercase; }
.promo-widget .btn { margin-top: var(--space-5, 20px); }

/* Icon tròn màu pastel cho khối "Vì sao chọn" — nhất quán với cat-icon */
.feature-icon {
  width: 52px; height: 52px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  margin-inline: auto;
}
.feature-icon svg { width: 24px; height: 24px; }

/* Carousel ngang cho khối khóa học nổi bật (giống hình mẫu: 5 thẻ + nút mũi tên) */
.course-row-wrap { position: relative; }
.course-row {
  display: flex; gap: var(--space-6);
  overflow-x: auto; scroll-snap-type: x mandatory;
  padding-bottom: var(--space-2);
  scrollbar-width: none;
}
.course-row::-webkit-scrollbar { display: none; }
.course-row .course-card { flex: 0 0 260px; scroll-snap-align: start; }
.course-row__arrow {
  position: absolute; top: 40%; right: -18px; transform: translateY(-50%);
  width: 40px; height: 40px; border-radius: var(--radius-full);
  background: var(--bg-page); border: 1px solid var(--border-default); box-shadow: var(--shadow-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-primary);
}
.course-row__arrow:hover { border-color: var(--color-primary-400); color: var(--color-primary-600); }
@media (max-width: 640px) { .course-row__arrow { display: none; } }

/* ===== Compact grid modifiers (chỉ áp dụng khi màn hình đủ rộng, nhường quyền cho responsive rule gốc ở màn nhỏ) ===== */
@media (min-width: 901px) {
  .category-grid--compact { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 1101px) {
  /* .course-grid có breakpoint riêng ở 1100px (xem sections.css), nên modifier này
     phải nhường quyền tới quá mốc đó mới áp dụng — tránh đè lẫn nhau ở khoảng 901–1100px. */
  .course-grid--compact { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 901px) {
  .feature-grid--5col { grid-template-columns: repeat(5, 1fr); }
}
/* Các modifier trên chỉ biết viewport, không biết .home-main bị sidebar + cột phụ
   bóp hẹp đến đâu — nên "đủ rộng" (viewport) không có nghĩa cột nội dung đủ rộng.
   Ghi đè lại theo chiều rộng THẬT của .home-main bằng selector cụ thể hơn
   (".home-main .xxx" — 2 lớp, độ đặc hiệu cao hơn bản gốc 1 lớp ở trên) để các
   giá trị "thu gọn" của compact nhường lại cho mức thu gọn cơ bản khi bị bóp hẹp. */
@container home-main (max-width: 900px) {
  .home-main .category-grid--compact { grid-template-columns: repeat(3, 1fr); }
}
@container home-main (max-width: 480px) {
  .home-main .category-grid--compact { grid-template-columns: repeat(2, 1fr); }
}
@container home-main (max-width: 1100px) {
  .home-main .course-grid--compact { grid-template-columns: repeat(2, 1fr); }
}
@container home-main (max-width: 560px) {
  .home-main .course-grid--compact { grid-template-columns: minmax(0,1fr); }
}
@container home-main (max-width: 900px) {
  .home-main .feature-grid--5col { grid-template-columns: repeat(3, 1fr); }
}
@container home-main (max-width: 560px) {
  .home-main .feature-grid--5col { grid-template-columns: minmax(0,1fr); }
}