/* ==========================================================================
   UX_POLISH.CSS — Apex Nexus / Nova Bastion
   UX refinement layer: spacing, transitions, micro-interactions,
   consistent empty/loading/error states, page headers, form polish.
   v1.0 — April 2026
   ========================================================================== */

/* ---------- Page entrance animation ---------- */
@keyframes page-enter {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.main {
  animation: page-enter .35s var(--ease) both;
}

/* ---------- Page header pattern ---------- */
.page-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.page-header__title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-bright);
  display: flex;
  align-items: center;
  gap: .5rem;
}
.page-header__icon {
  color: var(--accent);
  font-size: 1.1rem;
}
.page-header__subtitle {
  font-size: .82rem;
  color: var(--muted);
  margin-top: .15rem;
}
.page-header__actions {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-shrink: 0;
}
@media (max-width: 768px) {
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
  }
}

/* ---------- Button micro-interactions ---------- */
.btn {
  position: relative;
  overflow: hidden;
  transform: translateZ(0); /* GPU layer */
}
.btn:active:not(:disabled) {
  transform: scale(.97);
  transition-duration: 80ms;
}
.btn--primary:active:not(:disabled) {
  background: #04a87a;
}
.btn--outline:active:not(:disabled) {
  background: rgba(255,255,255,.06);
}

/* Ripple effect on click */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--ripple-x, 50%) var(--ripple-y, 50%),
    rgba(255,255,255,.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity .4s var(--ease);
  pointer-events: none;
}
.btn:active::after {
  opacity: 1;
  transition-duration: 0ms;
}

/* Loading state for buttons */
.btn--loading {
  pointer-events: none;
  opacity: .7;
}
.btn--loading::before {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: btn-spin .6s linear infinite;
  margin-right: .35rem;
  flex-shrink: 0;
}
@keyframes btn-spin {
  to { transform: rotate(360deg); }
}

/* ---------- Panel polish ---------- */
.panel {
  transition: border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.panel:hover {
  border-color: rgba(255,255,255,.08);
}

/* Smooth collapse transition */
.panel__collapse {
  transition: max-height .3s var(--ease), opacity .25s var(--ease), padding .3s var(--ease);
  overflow: hidden;
}
.panel__collapse.is-collapsed {
  max-height: 0 !important;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
}

/* Panel toggle arrow rotation */
.panel__toggle {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: .85rem;
  transition: transform .25s var(--ease), color var(--dur) var(--ease);
  padding: .2rem .35rem;
  border-radius: var(--radius-sm);
  line-height: 1;
}
.panel__toggle:hover {
  color: var(--text-bright);
  background: rgba(255,255,255,.05);
}
.panel__toggle[aria-expanded="false"] {
  transform: rotate(180deg);
}

/* ---------- Card polish ---------- */
.card {
  transition: border-color .25s var(--ease),
              box-shadow .25s var(--ease),
              transform .25s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
}

/* ---------- Empty states — richer, more helpful ---------- */
.panel__empty {
  color: var(--muted);
  font-size: .85rem;
  text-align: center;
  padding: 1.5rem 1rem;
  line-height: 1.5;
}
.panel__empty::before {
  content: '';
  display: block;
  width: 36px;
  height: 36px;
  margin: 0 auto .65rem;
  border-radius: 50%;
  background: var(--bg-subtle);
  border: 1px dashed var(--border);
}

/* Rich empty state component */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  text-align: center;
  gap: .5rem;
}
.empty-state__icon {
  font-size: 2rem;
  opacity: .35;
  margin-bottom: .25rem;
}
.empty-state__title {
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
}
.empty-state__text {
  font-size: .82rem;
  color: var(--muted);
  max-width: 28rem;
  line-height: 1.5;
}
.empty-state__action {
  margin-top: .75rem;
}

/* ---------- Skeleton loader utility ---------- */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-subtle) 25%,
    rgba(255,255,255,.06) 50%,
    var(--bg-subtle) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.4s var(--ease) infinite;
  border-radius: var(--radius-sm);
}
.skeleton--text {
  height: .85rem;
  margin-bottom: .5rem;
  width: 100%;
}
.skeleton--text-short {
  height: .85rem;
  margin-bottom: .5rem;
  width: 60%;
}
.skeleton--text-narrow {
  height: .85rem;
  margin-bottom: .5rem;
  width: 40%;
}
.skeleton--card {
  height: 80px;
  margin-bottom: .75rem;
}
.skeleton--circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}
@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---------- Form polish ---------- */
.input,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="number"],
select,
textarea {
  font-family: var(--font);
  font-size: .85rem;
  color: var(--text);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .45rem .65rem;
  transition: border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
  outline: none;
}
.input:focus,
input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.input::placeholder,
input::placeholder,
textarea::placeholder {
  color: var(--muted);
  opacity: .7;
}

/* Input sizes */
.input--sm {
  font-size: .78rem;
  padding: .3rem .5rem;
}

/* Form group */
.form-group {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  margin-bottom: 1rem;
}
.form-group__label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.form-group__help {
  font-size: .72rem;
  color: var(--muted);
  line-height: 1.4;
}
.form-group__error {
  font-size: .72rem;
  color: var(--danger);
  line-height: 1.4;
}

/* ---------- Filter pills polish ---------- */
.filter-pills {
  display: flex;
  gap: .35rem;
  padding: .5rem 0;
  flex-wrap: wrap;
}
.pill {
  font-family: var(--font);
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: .3rem .65rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all var(--dur) var(--ease);
}
.pill:hover {
  border-color: var(--accent);
  color: var(--text);
}
.pill--active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Dashboard status bar polish ---------- */
.dashboard__status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .5rem .85rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: .25rem;
}
.dashboard__status-left {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
}
.dashboard__status-ts {
  font-size: .75rem;
  color: var(--muted);
  white-space: nowrap;
}

/* Symbol jump form — clean style */
.symbol-jump {
  display: inline-flex;
  gap: .35rem;
  align-items: center;
}
.symbol-jump__input {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .25rem .45rem;
  color: var(--text);
  font-size: .8rem;
  width: 6rem;
  text-transform: uppercase;
  font-family: var(--font-mono);
}
.symbol-jump__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}
.symbol-jump__input::placeholder {
  text-transform: none;
  font-family: var(--font);
}

/* Status badges */
.status-badge {
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .08em;
  padding: .15rem .5rem;
  border-radius: 999px;
  text-transform: uppercase;
}
.status-badge--live {
  background: var(--ok-dim);
  color: var(--ok);
}

/* ---------- Alert filter controls polish ---------- */
.dash-alerts-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  padding: .35rem 0 .5rem;
  font-size: .78rem;
}
.dash-alerts-controls label {
  display: flex;
  align-items: center;
  gap: .25rem;
  cursor: pointer;
  white-space: nowrap;
}
.dash-alerts-controls input[type="checkbox"] {
  accent-color: var(--accent);
}

/* ---------- Log feed polish ---------- */
.log-entry {
  padding: .35rem .85rem;
  font-size: .78rem;
  font-family: var(--font-mono);
  border-bottom: 1px solid var(--border-light);
  color: var(--muted);
  line-height: 1.5;
}
.log-entry:last-child { border-bottom: none; }
.log-entry--error { color: var(--danger); background: var(--danger-dim); }
.log-entry--warn  { color: var(--warn); background: var(--warn-dim); }
.log-entry--info  { color: var(--muted); }

/* ---------- Table enhancements ---------- */
.table tbody tr {
  transition: background var(--dur) var(--ease);
}
.th--sortable {
  cursor: pointer;
  user-select: none;
  transition: color var(--dur) var(--ease);
}
.th--sortable:hover {
  color: var(--accent);
}

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

/* Nav link groups — visual separator between primary and secondary */
.nav__links .nav__separator {
  display: flex;
  align-items: center;
  padding: 0 .35rem;
}
.nav__separator::after {
  content: '';
  display: block;
  width: 1px;
  height: 16px;
  background: var(--border);
  opacity: .6;
}

/* Better active state */
.nav__link--active {
  color: var(--accent) !important;
  background: var(--accent-dim);
  font-weight: 600;
}

/* Nav link hover: smoother */
.nav__link {
  position: relative;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width .2s var(--ease), left .2s var(--ease);
  border-radius: 1px;
}
.nav__link:hover::after,
.nav__link--active::after {
  width: 70%;
  left: 15%;
}

/* Mobile nav groups */
@media (max-width: 768px) {
  .nav__separator {
    padding: .25rem 0;
  }
  .nav__separator::after {
    width: 100%;
    height: 1px;
  }
  .nav__link::after {
    display: none;
  }
}

/* ---------- Toast improvements ---------- */
.dash-toast {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(8px);
}

/* ---------- Command Palette polish ---------- */
.cmd-palette__backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(4px);
}
.cmd-palette__box {
  position: fixed;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 540px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: cmd-enter .2s var(--ease);
}
@keyframes cmd-enter {
  from { opacity: 0; transform: translateX(-50%) translateY(-10px) scale(.98); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
}
.cmd-palette__input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text-bright);
  font-size: 1rem;
  padding: .85rem 1rem;
  outline: none;
}
.cmd-palette__input::placeholder {
  color: var(--muted);
}
.cmd-palette__list {
  list-style: none;
  max-height: 280px;
  overflow-y: auto;
}
.cmd-palette__footer {
  padding: .5rem .85rem;
  font-size: .72rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: var(--bg-subtle);
}
.cmd-palette__footer kbd {
  display: inline-block;
  padding: .1rem .35rem;
  font-size: .65rem;
  font-family: var(--font-mono);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
}

/* ---------- Tooltip system ---------- */
[data-tooltip] {
  position: relative;
}
[data-tooltip]::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  padding: .3rem .6rem;
  font-size: .72rem;
  color: var(--text-bright);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity .15s var(--ease), transform .15s var(--ease);
  z-index: 100;
  box-shadow: var(--shadow);
}
[data-tooltip]:hover::before {
  opacity: 1;
  transform: translateX(-50%) translateY(-8px);
}

/* ---------- Section wrapper utility ---------- */
.section {
  margin-bottom: 2rem;
}
.section__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
}

/* ---------- Badge: beta tag ---------- */
.badge--beta {
  background: var(--accent2-dim);
  color: var(--accent2);
  font-size: .6rem;
  padding: .1rem .4rem;
  border-radius: 999px;
  vertical-align: super;
  margin-left: .25rem;
}

/* ---------- Mobile responsiveness refinements ---------- */
@media (max-width: 768px) {
  /* Ensure tap targets are at least 44px */
  .btn--sm {
    min-height: 36px;
    min-width: 36px;
  }
  .pill {
    padding: .4rem .75rem;
    min-height: 36px;
  }
  .nav__link {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  /* Alert controls stack cleanly */
  .dash-alerts-controls {
    gap: .35rem;
  }
  .dash-alerts-controls .input--sm {
    min-width: 0;
    flex: 1;
  }

  /* Dashboard status bar */
  .dashboard__status {
    flex-direction: column;
    align-items: flex-start;
    gap: .35rem;
    padding: .65rem .85rem;
  }

  /* Metrics grid: 2 cols */
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: .5rem;
  }

  /* Page header on mobile */
  .page-header {
    margin-bottom: 1rem;
    padding-bottom: .75rem;
  }
  .page-header__title {
    font-size: 1.15rem;
  }
}

@media (max-width: 480px) {
  .main {
    padding: .75rem .75rem 2rem;
  }
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .dashboard__status-left {
    flex-wrap: wrap;
    gap: .35rem;
  }
}

/* ---------- Scrollbar refinement for panels ---------- */
.panel__body--scroll::-webkit-scrollbar {
  width: 4px;
}
.panel__body--scroll::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,.1);
  border-radius: 2px;
}
.panel__body--scroll::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,.2);
}

/* ---------- Focus-visible only (clean up focus rings) ---------- */
.btn:focus:not(:focus-visible) {
  outline: none;
}
.nav__link:focus:not(:focus-visible) {
  outline: none;
}
.pill:focus:not(:focus-visible) {
  outline: none;
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .main {
    animation: none;
  }
  .card:hover {
    transform: none;
  }
  .btn:active:not(:disabled) {
    transform: none;
  }
  .skeleton,
  .skeleton--text,
  .skeleton--text-short,
  .skeleton--text-narrow,
  .skeleton--card {
    animation: none;
  }
}

/* ---------- Hero module badge ---------- */
.badge--beta-platform {
  display: inline-block;
  margin-top: .5rem;
  padding: .25em .75em;
  font-size: .75rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: var(--radius-sm);
  opacity: .8;
}

/* ---------- Welcome guide ---------- */
.welcome-guide {
  max-width: 52rem;
  margin: 0 auto;
}
.card--welcome {
  position: relative;
  border: 1px solid rgba(120, 140, 255, .25);
  background: rgba(20, 22, 30, .92);
}
.card__dismiss {
  position: absolute;
  top: .75rem;
  right: .75rem;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.2rem;
  cursor: pointer;
  line-height: 1;
  padding: .25rem;
  border-radius: var(--radius-sm);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.card__dismiss:hover {
  color: var(--text-bright);
  background: rgba(255,255,255,.06);
}
.card__title--accent {
  color: var(--accent);
  font-size: 1.15rem;
  margin-bottom: .5rem;
}
.welcome-guide__actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: .75rem;
}
.welcome-guide__actions .btn {
  text-align: center;
  justify-content: center;
}