/* ============================================================
   Premium Forest UI Layer — Foresst Study
   ============================================================ */

/* ── Ambient background ── */
body {
  background: var(--color-bg);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(82, 183, 136, 0.09) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 100%, rgba(45, 106, 79, 0.06) 0%, transparent 50%);
}

[data-theme="dark"] body::before {
  background:
    radial-gradient(ellipse 70% 50% at 15% 0%, rgba(82, 183, 136, 0.07) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 85% 100%, rgba(26, 61, 46, 0.22) 0%, transparent 55%);
}

.app {
  position: relative;
  z-index: 1;
}

/* ── Display typography ── */
.sidebar__title,
.workspace__title,
.welcome-screen__title,
.dash-header__title,
.feynman-setup__title,
.feynman-report__title,
.fc-header__title,
.notes-dashboard__title,
.kb-dashboard__title,
.keywords-dashboard__title {
  font-family: var(--font-display);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-display);
}

/* ── Sidebar — royal navy panel ── */
.sidebar {
  background: var(--gradient-royal);
  border-right: 1px solid var(--sidebar-border);
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .sidebar {
  box-shadow: 4px 0 32px rgba(0, 0, 0, 0.40);
}

.sidebar::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 1px;
  height: 100%;
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--color-gold) 30%,
    var(--color-gold) 70%,
    transparent 100%
  );
  opacity: 0.35;
  pointer-events: none;
}

.sidebar__title {
  color: var(--sidebar-text-active);
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  letter-spacing: 0.02em;
}

.sidebar__brand-btn:hover {
  background-color: var(--sidebar-bg-hover);
}

.sidebar__logo {
  background: var(--gradient-gold);
  color: var(--color-royal-deep);
  box-shadow: var(--shadow-gold);
  border-radius: var(--radius-md);
}

.sidebar__collapse-btn {
  color: var(--sidebar-label);
}

.sidebar__collapse-btn:hover {
  background-color: var(--sidebar-bg-hover);
  color: var(--sidebar-text-active);
}

.sidebar__section-label {
  color: var(--sidebar-label);
  letter-spacing: var(--letter-spacing-wide);
  font-size: 0.6875rem;
}

.sidebar__footer {
  border-top-color: var(--sidebar-border);
}

.sidebar__footer-text {
  color: var(--sidebar-label);
}

/* Subject items on dark sidebar */
.subject-item {
  color: var(--sidebar-text);
}

.subject-item:hover {
  background-color: var(--sidebar-bg-hover);
  color: var(--sidebar-text-active);
}

.subject-item.is-active {
  background-color: var(--sidebar-bg-active);
  color: var(--sidebar-text-active);
  box-shadow: inset 0 0 0 1px rgba(201, 169, 98, 0.20);
}

.subject-item.is-active::before {
  background: var(--gradient-gold);
  width: 3px;
  box-shadow: 0 0 10px var(--color-gold-glow);
}

.subject-item.is-active .subject-item__icon {
  background: rgba(201, 169, 98, 0.18) !important;
  color: var(--color-gold-light) !important;
}

/* ── Navbar — refined bar with gold accent line ── */
.navbar {
  height: var(--navbar-height);
  min-height: var(--navbar-height);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.navbar::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-gold) 20%,
    var(--color-gold-light) 50%,
    var(--color-gold) 80%,
    transparent 100%
  );
  opacity: 0.45;
}

.search-bar {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  height: 38px;
}

.search-bar:focus-within {
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px var(--color-accent-soft), var(--shadow-gold);
}

.navbar__btn--primary {
  background: var(--gradient-gold);
  color: var(--color-royal-deep);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-gold);
  border: 1px solid rgba(201, 169, 98, 0.40);
}

.navbar__btn--primary:hover {
  filter: brightness(1.06);
  color: var(--color-royal-deep);
  box-shadow: 0 6px 24px rgba(201, 169, 98, 0.30);
}

[data-theme="dark"] .navbar__btn--primary {
  color: var(--color-royal-deep);
}

/* ── Main content area ── */
.main-content {
  background: var(--gradient-surface);
}

/* ── Welcome screen ── */
.welcome-screen__card {
  border: 1px solid var(--color-border-gold);
  box-shadow: var(--shadow-lg), var(--shadow-gold);
  position: relative;
  overflow: hidden;
}

.welcome-screen__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-gold);
}

.welcome-screen__icon {
  background: var(--color-accent-soft);
  border: 1px solid var(--color-border-gold);
  color: var(--color-accent);
  box-shadow: var(--shadow-gold);
}

.welcome-screen__title {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hint-chip:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-color: var(--color-border-gold);
}

.welcome-screen__quote-mark {
  color: var(--color-gold);
  opacity: 0.7;
}

/* ── Workspace ── */
.workspace__breadcrumb {
  color: var(--color-gold-dark);
  letter-spacing: var(--letter-spacing-wide);
}

[data-theme="dark"] .workspace__breadcrumb {
  color: var(--color-gold);
}

.workspace__title {
  color: var(--color-text-primary);
}

/* Module cards — premium elevated cards */
.workspace-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  background: var(--color-bg-elevated);
  transition:
    transform var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
}

.workspace-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 2px;
  background: var(--gradient-gold);
  border-radius: 0 0 2px 2px;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.workspace-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-gold);
  border-color: var(--color-border-gold);
}

.workspace-card:hover::after {
  opacity: 1;
}

.workspace-card__icon {
  background: var(--color-accent-soft);
  border: 1px solid var(--color-border-gold);
  color: var(--color-accent);
  border-radius: var(--radius-md);
}

.workspace-card__count {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border: 1px solid var(--color-border-gold);
  font-weight: var(--font-weight-semibold);
}

.workspace-card--feynman .workspace-card__icon {
  background: var(--gradient-gold);
  color: var(--color-royal-deep);
  border: none;
  box-shadow: var(--shadow-gold);
}

/* ── Dashboard ── */
.dash-header__greeting {
  color: var(--color-gold-dark);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  font-size: 0.6875rem;
}

[data-theme="dark"] .dash-header__greeting {
  color: var(--color-gold);
}

.dash-header__pill {
  background: var(--color-accent-soft);
  border-color: var(--color-border-gold);
  color: var(--color-accent);
}

.dash-stat {
  border-radius: var(--radius-xl);
  border-color: var(--color-border);
  transition:
    transform var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
}

.dash-stat:hover {
  border-color: var(--color-border-gold);
  box-shadow: var(--shadow-md), var(--shadow-gold);
}

.dash-stat--forest .dash-stat__icon {
  background: var(--gradient-gold);
  color: var(--color-royal-deep);
}

.dash-panel {
  border-radius: var(--radius-xl);
  border-color: var(--color-border);
}

.dash-panel__title {
  font-family: var(--font-display);
}

/* ── Buttons (global) ── */
.btn--primary,
.navbar__btn--primary {
  background: var(--gradient-gold);
  color: var(--color-royal-deep);
  font-weight: var(--font-weight-semibold);
  border: 1px solid rgba(201, 169, 98, 0.35);
  box-shadow: var(--shadow-gold);
}

.btn--primary:hover,
.navbar__btn--primary:hover {
  filter: brightness(1.05);
  box-shadow: 0 6px 20px rgba(201, 169, 98, 0.28);
  color: var(--color-royal-deep);
}

[data-theme="dark"] .btn--primary {
  color: var(--color-royal-deep);
}

/* ── Cards (notes, keywords, etc.) ── */
.note-card,
.kb-card,
.keyword-card,
.fc-stat,
.dash-subject-card {
  border-radius: var(--radius-xl);
}

.note-card:hover,
.kb-card:hover,
.keyword-card:hover {
  border-color: var(--color-border-gold);
  box-shadow: var(--shadow-md), 0 0 0 1px var(--color-accent-soft);
}

.note-card__chapter {
  color: var(--color-gold-dark);
}

[data-theme="dark"] .note-card__chapter {
  color: var(--color-gold);
}

/* ── Toast ── */
.app-toast {
  background: var(--gradient-royal);
  border: 1px solid var(--color-border-gold);
  color: var(--sidebar-text-active);
  box-shadow: var(--shadow-lg), var(--shadow-gold);
}

/* ── Feynman premium touches ── */
.feynman-setup__badge {
  background: var(--gradient-gold);
  color: var(--color-royal-deep);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-wide);
}

.feynman-setup__title {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.feynman-session__chat,
.feynman-panel__block {
  border-radius: var(--radius-xl);
}

.feynman-msg--partner .feynman-msg__avatar {
  background: var(--gradient-gold);
  color: var(--color-royal-deep);
  border: none;
}

.feynman-report__score {
  border-color: var(--color-border-gold);
}

.feynman-report__score-val {
  font-family: var(--font-display);
  color: var(--color-accent);
}

/* ── AI Chat ── */
.ai-chat__header {
  border-bottom-color: var(--color-border-gold);
}

.ai-chat__title {
  font-family: var(--font-display);
}

/* ── Scrollbars (refined) ── */
.main-content::-webkit-scrollbar-thumb,
.sidebar__nav::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--color-gold-light), var(--color-gold-dark));
  border-radius: var(--radius-full);
}

/* ── Search / command palette ── */
.global-search__panel {
  border: 1px solid var(--color-border-gold);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), var(--shadow-gold);
}

.global-search__backdrop {
  backdrop-filter: blur(6px);
  background-color: rgba(10, 14, 24, 0.55);
}

/* ── Spinner ── */
.ui-spinner,
.page-loading__spinner {
  border-top-color: var(--color-gold);
}

/* ── Mobile sidebar overlay ── */
.sidebar-overlay.is-visible {
  background-color: rgba(10, 14, 24, 0.65);
  backdrop-filter: blur(4px);
}

.dash-subject-bar__fill {
  background: var(--gradient-gold) !important;
}

.dash-subject-bar__pct {
  color: var(--color-accent);
  font-weight: var(--font-weight-semibold);
}

/* ── Flashcards study premium ── */
.fc-stat {
  border-radius: var(--radius-xl);
}

.fc-stat:hover {
  border-color: var(--color-border-gold);
  box-shadow: var(--shadow-md), var(--shadow-gold);
}

/* ── Knowledge graph ── */
.kg-view__header h1 {
  font-family: var(--font-display);
}

/* ── Subtle card shimmer on hover ── */
@keyframes forestShimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

.workspace-card::before {
  background: var(--gradient-shimmer);
  background-size: 200% 100%;
}

.workspace-card:hover::before {
  opacity: 1;
  animation: forestShimmer 2.5s var(--ease-in-out) infinite;
}