/* ============================================
   LAYOUT — App Shell, Header, Sidebar, Main
   ============================================ */

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

/* ── Sidebar ── */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sticky);
  transition: transform var(--transition), width var(--transition);
  overflow: hidden;
}

.sidebar--collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--border);
  min-height: var(--header-height);
  text-decoration: none;
}

.sidebar__logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--neon-glow-sm);
  font-size: 18px;
  color: white;
}

.sidebar__logo-text {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: opacity var(--transition), width var(--transition);
}

.sidebar__logo-title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--text);
  white-space: nowrap;
  line-height: 1.2;
}

.sidebar__logo-subtitle {
  font-size: var(--text-xs);
  color: var(--text-muted);
  white-space: nowrap;
}

.sidebar--collapsed .sidebar__logo-text {
  opacity: 0;
  width: 0;
  pointer-events: none;
}

.sidebar__nav {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar__nav-section {
  margin-bottom: var(--space-6);
}

.sidebar__nav-label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: 0 var(--space-3);
  margin-bottom: var(--space-2);
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--transition);
}

.sidebar--collapsed .sidebar__nav-label {
  opacity: 0;
}

.sidebar__nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  white-space: nowrap;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.sidebar__nav-link:hover {
  background: var(--surface-2);
  color: var(--primary);
  text-decoration: none;
}

.sidebar__nav-link.active {
  background: rgba(var(--primary-rgb), .1);
  color: var(--primary);
  font-weight: var(--font-semibold);
}

.sidebar__nav-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 20%;
  bottom: 20%;
  width: 3px;
  background: var(--primary);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  box-shadow: var(--neon-glow-sm);
}

.sidebar__nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.sidebar__nav-text {
  overflow: hidden;
  transition: opacity var(--transition), width var(--transition);
}

.sidebar--collapsed .sidebar__nav-text {
  opacity: 0;
  width: 0;
}

.sidebar__nav-badge {
  margin-left: auto;
  background: var(--primary);
  color: white;
  font-size: 10px;
  font-weight: var(--font-bold);
  padding: 2px 6px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  transition: opacity var(--transition);
}

.sidebar--collapsed .sidebar__nav-badge {
  opacity: 0;
}

/* ── AI nav item — gradient text + NEW badge ── */
.sidebar__nav-link--ai {
  color: var(--primary-text);
}
.sidebar__nav-link--ai:hover {
  background: rgba(var(--primary-rgb), .08);
  color: var(--primary-text);
}
.sidebar__nav-link--ai.active {
  background: rgba(var(--primary-rgb), .12);
}
.sidebar__nav-icon--ai {
  filter: drop-shadow(0 0 5px rgba(var(--primary-rgb), .55));
  color: var(--primary);
}
.sidebar__nav-text--ai {
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: var(--font-semibold);
  letter-spacing: .02em;
}
/* Keep collapsed state compatible */
.sidebar--collapsed .sidebar__nav-text--ai {
  opacity: 0;
  width: 0;
}
.sidebar__nav-badge--new {
  margin-left: auto;
  font-size: 9px;
  font-weight: var(--font-bold);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: rgba(var(--primary-rgb), .18);
  color: var(--primary-text);
  letter-spacing: .04em;
  flex-shrink: 0;
  transition: opacity var(--transition);
}
.sidebar--collapsed .sidebar__nav-badge--new {
  display: none;
}

.sidebar__footer {
  border-top: 1px solid var(--border);
  padding: var(--space-2) 0;
}

.sidebar__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  margin-left: auto;
  transition: all var(--transition-fast);
}

.sidebar__toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(var(--primary-rgb), .06);
}

/* ── Main Content Area ── */
.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition: margin-left var(--transition);
}

.main-wrapper--collapsed {
  margin-left: var(--sidebar-collapsed);
}

/* ── Top Header ── */
.app-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  gap: var(--space-4);
  z-index: var(--z-sticky);
}

.app-header__left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 1;
}

.app-header__hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.app-header__hamburger:hover {
  background: var(--surface-2);
  color: var(--primary);
}

.app-header__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.app-header__breadcrumb-sep {
  color: var(--border-strong);
}

.app-header__breadcrumb-current {
  color: var(--text);
  font-weight: var(--font-medium);
}

.app-header__right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ── Public Header (landing/auth pages) ── */
.public-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-sticky);
}

.public-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.public-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.public-header__logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: white;
  box-shadow: var(--neon-glow-sm);
}

.public-header__logo-title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  color: var(--text);
}

.public-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.public-header__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}

.public-header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ── Main Content ── */
.main-content {
  flex: 1;
  padding: var(--space-8) var(--space-6);
}

@media (max-width: 768px) {
  .main-content {
    padding: var(--space-6) var(--space-4);
  }
}

/* ── Page Layout ── */
.page-layout {
  display: flex;
  min-height: 100vh;
}

/* ── Auth Layout ── */
.auth-layout {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  background: var(--bg);
  position: relative;
  overflow: hidden;
}

.auth-layout::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(var(--primary-rgb), .08) 0%, transparent 70%);
  pointer-events: none;
}

.auth-layout::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(var(--primary-rgb), .05) 0%, transparent 70%);
  pointer-events: none;
}

/* Stronger glow blobs in dark mode */
:root[data-theme="dark"] .auth-layout::before {
  background: radial-gradient(circle, rgba(var(--primary-rgb), .14) 0%, transparent 70%);
}
:root[data-theme="dark"] .auth-layout::after {
  background: radial-gradient(circle, rgba(var(--primary-rgb), .09) 0%, transparent 70%);
}

.auth-box {
  width: 100%;
  max-width: 440px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-10) var(--space-8);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  position: relative;
  z-index: 1;
  animation: slideUp .4s ease;
}

@media (max-width: 480px) {
  .auth-box {
    padding: var(--space-8) var(--space-6);
  }

  .auth-layout {
    padding: var(--space-4);
    align-items: flex-start;
    padding-top: var(--space-10);
  }
}

/* ── Dashboard Grid ── */
.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

@media (max-width: 1024px) {
  .dashboard-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .dashboard-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--space-6);
}

@media (max-width: 1100px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

/* ══════════════════════════════════════════
   DASHBOARD — redesigned layout
   ══════════════════════════════════════════ */

/* Header */
.db-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.db-header__date {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: capitalize;
  margin-bottom: var(--space-2);
}

.db-header__title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 var(--space-2);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.db-header__sub {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.db-header__highlight {
  font-weight: 700;
  color: var(--primary-text);
}

.db-streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--warning-light);
  color: var(--warning);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.db-header__actions {
  display: flex;
  gap: var(--space-3);
  flex-shrink: 0;
  flex-wrap: wrap;
}

/* Onboarding card */
.db-onboarding {
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, rgba(var(--primary-rgb),0.05), rgba(var(--primary-rgb),0.14)) !important;
  border: 1px solid rgba(var(--primary-rgb),0.3) !important;
}

.db-onboarding__inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.db-onboarding__emoji {
  font-size: 48px;
  flex-shrink: 0;
}

.db-onboarding__text {
  flex: 1;
  min-width: 200px;
}

.db-onboarding__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  margin: 0 0 var(--space-2);
}

.db-onboarding__desc {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin: 0;
  line-height: var(--leading-relaxed);
}

/* ── Top row: 3 cards ── */
.db-top-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}

.db-card-label {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}

/* Countdown card */
.db-countdown {
  padding: var(--space-5);
}

.db-countdown__body {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

/* Circular ring via conic-gradient */
.db-ring {
  --ring-size: 110px;
  --ring-stroke: 10px;
  --ring-color: var(--primary);
  --ring-bg: var(--surface-2);
  width: var(--ring-size);
  height: var(--ring-size);
  border-radius: 50%;
  background: conic-gradient(
    var(--ring-color) calc(var(--ring-pct, 0) * 1%),
    var(--ring-bg) 0
  );
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 0 var(--ring-stroke) var(--surface);
  position: relative;
  transition: background 0.4s ease;
}

.db-ring__inner {
  width: calc(var(--ring-size) - var(--ring-stroke) * 3);
  height: calc(var(--ring-size) - var(--ring-stroke) * 3);
  border-radius: 50%;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.db-ring__num {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.03em;
}

.db-ring__sub {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
}

.db-countdown__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.db-countdown__date {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
}

.db-countdown__caption {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.db-countdown__tip {
  font-size: var(--text-xs);
  color: var(--primary-text);
  font-weight: 500;
  margin-top: var(--space-2);
}

/* Progress card */
.db-progress-card {
  padding: var(--space-5);
}

.db-progress-card__stats {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.db-metric {}

.db-metric__value {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.02em;
}

.db-metric__label {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  margin: 4px 0 6px;
}

.db-metric__bar {
  height: 5px;
  background: var(--surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.db-metric__fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.6s cubic-bezier(.25,.46,.45,.94);
  min-width: 2px;
}

/* Weak areas card */
.db-weak-card {
  padding: var(--space-5);
}

.db-weak-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.db-weak-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  background: var(--surface-2);
  text-decoration: none;
  transition: background var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
}

.db-weak-item:hover {
  background: var(--surface-3);
  transform: translateX(2px);
}

.db-weak-item__pct {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  font-size: var(--text-xs);
  font-weight: 700;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.db-weak-item__name {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--text);
  line-height: 1.35;
}

.db-weak-item__arrow {
  color: var(--text-muted);
  font-size: 1.2rem;
}

/* Empty hint */
.db-empty-hint {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}

/* ── Bottom row ── */
.db-bottom-row {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-5);
}

/* Topics card */
.db-topics-card {
  padding: var(--space-5);
}

.db-topics-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-top: var(--space-2);
}

.db-topic-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-2);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background var(--transition-fast);
}

.db-topic-row:hover {
  background: var(--surface-2);
}

.db-topic-row__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.db-topic-row__info {
  flex: 1;
  min-width: 0;
}

.db-topic-row__name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text);
  margin-bottom: 5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.db-topic-row__bar {
  height: 5px;
  background: var(--surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.db-topic-row__fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
  min-width: 2px;
}

.db-topic-row__meta {
  flex-shrink: 0;
  text-align: right;
}

.db-topic-row__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* Side column */
.db-side-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* Quick actions card */
.db-actions-card {
  padding: var(--space-5);
}

.db-actions-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.db-action-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  text-decoration: none;
  background: var(--surface-2);
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.db-action-btn:hover {
  background: var(--surface-3);
  border-color: var(--border);
  transform: translateX(2px);
}

.db-action-btn--primary {
  background: rgba(var(--primary-rgb), 0.08);
  border-color: rgba(var(--primary-rgb), 0.2);
}

.db-action-btn--primary:hover {
  background: rgba(var(--primary-rgb), 0.14);
  border-color: rgba(var(--primary-rgb), 0.35);
}

.db-action-btn__icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}

.db-action-btn__text {
  flex: 1;
  min-width: 0;
}

.db-action-btn__label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text);
}

.db-action-btn__hint {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 1px;
}

.db-action-btn__arrow {
  color: var(--text-muted);
  font-size: 1.2rem;
  flex-shrink: 0;
}

/* Streak mini-card */
.db-streak-card {
  padding: var(--space-4) var(--space-5);
  background: linear-gradient(135deg, rgba(245,158,11,0.06), rgba(245,158,11,0.02)) !important;
  border-color: rgba(245,158,11,0.2) !important;
}

.db-streak-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.db-streak-card__icon {
  font-size: 1.6rem;
}

.db-streak-card__days {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.db-streak-card__sub {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.db-streak-dots {
  display: flex;
  gap: var(--space-1);
}

.db-streak-dot {
  flex: 1;
  text-align: center;
}

.db-streak-dot__label {
  font-size: 9px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.db-streak-dot__mark {
  height: 26px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: var(--text-muted);
}

.db-streak-dot--active .db-streak-dot__mark {
  background: var(--warning);
  color: #fff;
  font-size: 11px;
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .db-top-row {
    grid-template-columns: 1fr 1fr;
  }
  .db-weak-card {
    grid-column: span 2;
  }
  .db-bottom-row {
    grid-template-columns: 1fr;
  }
  .db-side-col {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .db-actions-card,
  .db-streak-card {
    flex: 1;
    min-width: 220px;
  }
}

@media (max-width: 768px) {
  .db-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .db-header__title {
    font-size: 1.4rem;
  }
  .db-top-row {
    grid-template-columns: 1fr;
  }
  .db-weak-card {
    grid-column: span 1;
  }
  .db-bottom-row {
    grid-template-columns: 1fr;
  }
  .db-side-col {
    flex-direction: column;
  }
  .db-countdown__body {
    gap: var(--space-4);
  }
  .db-ring {
    --ring-size: 90px;
    --ring-stroke: 8px;
  }
  .db-ring__num {
    font-size: 1.3rem;
  }
}

/* ── Topics Grid ── */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

/* ── Overlay for mobile sidebar ── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: calc(var(--z-sticky) - 1);
  backdrop-filter: blur(2px);
  animation: fadeIn .2s ease;
}

.sidebar-overlay.visible {
  display: block;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: 80vw !important;
    max-width: 320px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar--collapsed {
    width: 80vw !important;
    max-width: 320px;
  }

  .sidebar--collapsed .sidebar__nav-text,
  .sidebar--collapsed .sidebar__logo-text {
    display: block !important;
    opacity: 1 !important;
  }

  .sidebar-overlay {
    z-index: 999;
  }

  .main-wrapper,
  .main-wrapper--collapsed {
    margin-left: 0;
  }

  .app-header__hamburger {
    display: flex;
  }

  .public-header__hamburger {
    display: flex;
  }

  .public-header__nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: var(--space-4);
    gap: var(--space-2);
    box-shadow: var(--shadow-md);
  }

  .public-header__nav.open {
    display: flex;
  }

  /* Hide collapse button on mobile — use overlay tap instead */
  #sidebar-collapse-btn {
    display: none;
  }
}

/* ── No Sidebar Layout ── */
.no-sidebar-layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.no-sidebar-layout .main-content {
  flex: 1;
}

/* ── Sidebar tier badge ── */
.sidebar-tier-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 7px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .05em;
  margin-top: 2px;
  margin-bottom: 1px;
  line-height: 1.6;
}
.sidebar-tier-badge--pro {
  background: var(--primary);
  color: #fff;
}
.sidebar-tier-badge--premium {
  background: linear-gradient(135deg, var(--primary), #9333ea);
  color: #fff;
}