/* Layout & Responsive Structure */

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  overflow-x: hidden;
}

/* ──────────────────────────────────────
   App Shell
────────────────────────────────────── */

#app {
  min-height: 100vh;
  position: relative;
}

/* Screen container */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  pointer-events: none;
  opacity: 0;
}

.screen.active {
  pointer-events: all;
  opacity: 1;
  position: relative;
}

/* ──────────────────────────────────────
   Top Bar
────────────────────────────────────── */

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  height: 52px;
  flex-shrink: 0;
}

.top-bar__left,
.top-bar__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ──────────────────────────────────────
   Content Area
────────────────────────────────────── */

.content-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ──────────────────────────────────────
   Bottom Toolbar
────────────────────────────────────── */

.toolbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--toolbar-height);
  background: var(--color-toolbar-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  z-index: var(--z-toolbar);
  gap: var(--space-3);
}

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

.toolbar__center {
  flex: 1;
  display: flex;
  justify-content: center;
}

.toolbar__wander {
  display: flex;
  align-items: center;
}

/* ──────────────────────────────────────
   Landing Screen
────────────────────────────────────── */

#screen-landing {
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100vh;
  padding: var(--space-6);
  gap: var(--space-6);
  background: var(--color-bg);
}

.landing-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.landing-tagline {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  color: var(--color-text);
  line-height: var(--leading-tight);
}

.landing-sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 400px;
}

.landing-ctas {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

/* ──────────────────────────────────────
   Onboarding Screen
────────────────────────────────────── */

#screen-onboarding {
  min-height: 100vh;
  padding: var(--space-5);
  justify-content: center;
  align-items: center;
}

.onboarding-wrap {
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
}

.onboarding-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
}

.onboarding-dots {
  display: flex;
  gap: var(--space-2);
}

.onboarding-question {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.onboarding-question__title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-snug);
}

.onboarding-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.onboarding-options--grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-2);
}

.onboarding-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-6);
}

/* ──────────────────────────────────────
   Tag Fine-Tuning Screen
────────────────────────────────────── */

#screen-tags {
  min-height: 100vh;
  padding: var(--space-5);
  padding-bottom: calc(var(--toolbar-height) + var(--space-5));
}

.tags-header {
  margin-bottom: var(--space-5);
}

.tags-search {
  position: sticky;
  top: 0;
  background: var(--color-bg);
  padding: var(--space-3) 0;
  z-index: 2;
}

.tags-dimension {
  margin-bottom: var(--space-5);
}

.tags-dimension__title {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ──────────────────────────────────────
   Wander Screen (Core Loop)
────────────────────────────────────── */

#screen-wander {
  min-height: 100vh;
  padding-bottom: var(--toolbar-height);
}

.wander-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--toolbar-height) - 52px);
  padding: var(--space-6);
  gap: var(--space-6);
  text-align: center;
}

.wander-recent {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 400px;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.wander-recent__link {
  color: var(--color-accent);
  cursor: pointer;
}

.wander-recent__link:hover {
  text-decoration: underline;
}

/* ──────────────────────────────────────
   Content View (after stumble)
────────────────────────────────────── */

#screen-content {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-bottom: var(--toolbar-height);
  position: relative;
}

#screen-content .top-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: linear-gradient(to bottom, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 100%);
  color: white;
  pointer-events: none; /* Let clicks pass through gradient */
}

#screen-content .top-bar > * {
  pointer-events: auto; /* Re-enable clicks on buttons inside top-bar */
}

#screen-content .top-bar button,
#screen-content .top-bar a {
  color: white; /* Ensure text is visible on the dark gradient */
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.content-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: var(--toolbar-height);
  z-index: 1;
}

.content-iframe-wrap {
  flex: 1;
  position: relative;
  height: 100%;
  width: 100%;
}

.content-iframe-wrap iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  background: white; /* Ensure iframe has a background */
}

/* Fallback card */
.content-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  min-height: calc(100vh - var(--toolbar-height) - 52px);
}

.preview-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  padding: var(--space-6);
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  text-align: left;
}

.preview-card__domain {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.preview-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-snug);
}

.preview-card__description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

.preview-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

/* ──────────────────────────────────────
   Sidebar
────────────────────────────────────── */

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: calc(var(--z-sidebar) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}

.sidebar-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
}

.sidebar.open {
  transform: translateX(0);
  box-shadow: var(--shadow-xl);
}

.sidebar-header {
  padding: var(--space-5) var(--space-5) var(--space-3);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-3) var(--space-2);
}

.sidebar-nav__section-title {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  margin-top: var(--space-3);
}

.sidebar-footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ──────────────────────────────────────
   Chaos Slider Section
────────────────────────────────────── */

.chaos-section {
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.chaos-section__label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.chaos-section__dynamic {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  min-height: 1.2em;
  transition: color var(--transition-normal);
}

.chaos-slider-track-labels {
  display: flex;
  justify-content: space-between;
  width: 100%;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ──────────────────────────────────────
   Container
────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* ──────────────────────────────────────
   Toast notifications
────────────────────────────────────── */

.toast-container {
  position: fixed;
  bottom: calc(var(--toolbar-height) + var(--space-4));
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  box-shadow: var(--shadow-lg);
  pointer-events: all;
}

/* ──────────────────────────────────────
   Profile Pills (sidebar)
────────────────────────────────────── */

.profile-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
}

.profile-pill {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.profile-pill:hover {
  background: var(--color-bg-alt);
}

.profile-pill.active {
  background: var(--color-bg-alt);
  font-weight: 600;
}

.profile-pill__avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-full);
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  flex-shrink: 0;
  color: white;
  font-weight: 700;
}

/* ──────────────────────────────────────
   Saved Library / History
────────────────────────────────────── */

.lib-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
}

.lib-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: box-shadow var(--transition-fast);
}

.lib-item:hover {
  box-shadow: var(--shadow-md);
}

.lib-item__title {
  font-weight: 600;
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
}

.lib-item__domain {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.lib-item__date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ──────────────────────────────────────
   Modal
────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}

.modal-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transform: translateY(20px);
  transition: transform var(--transition-slow);
}

.modal-overlay.visible .modal {
  transform: translateY(0);
}

/* ──────────────────────────────────────
   Responsive
────────────────────────────────────── */

@media (max-width: 480px) {
  .landing-tagline {
    font-size: var(--text-2xl);
  }

  .onboarding-options--grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sidebar {
    width: 85vw;
  }

  .chaos-section {
    max-width: 100%;
    padding: 0 var(--space-2);
  }
}

@media (min-width: 768px) {
  .toolbar {
    padding: 0 var(--space-6);
  }
}