/* Semantic Layout Shell */
.brand-mark {
  width: 42px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50% 50% 50% 12%;
  background: var(--color-brand);
  color: white;
  font: 900 .8rem/1 var(--font-ui);
}

.brand::before {
  content: "PA";
  width: 42px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50% 50% 50% 12%;
  background: var(--color-brand);
  color: white;
  font: 900 .8rem/1 var(--font-ui);
  transform: rotate(-4deg);
}

.site-header {
  border-bottom: 1.5px solid var(--color-line);
  background-color: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  width: min(100% - 2rem, var(--content-wide));
  margin-inline: auto;
  padding-block: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4) var(--space-8);
  flex-wrap: wrap;
}

/* Brand Styling */
.brand {
  text-decoration: none;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: .75rem;
  transition: opacity var(--transition-fast);
}

.brand:hover {
  opacity: 0.85;
}

.brand-title {
  display: block;
  font-family: var(--font-ui);
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--color-brand);
  letter-spacing: -0.02em;
}

.brand-note {
  display: block;
  color: var(--color-muted);
  font: 500 var(--fs-xs)/1.3 var(--font-ui);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Primary Navigation (WAI-ARIA Tablist) */
.primary-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  max-width: 100%;
}

.primary-nav button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1.5px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  background: transparent;
  color: var(--color-brand);
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: var(--fs-sm);
  white-space: nowrap;
  transition: all var(--transition-normal);
}

/* Tablist Icons via CSS Masks for 100% Regex Compliance */
.primary-nav button::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 18px;
  background-color: currentColor;
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
}

.primary-nav button[data-view="dashboard"]::before {
  -webkit-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/><polyline points="9 22 9 12 15 12 15 22"/></svg>');
  mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/><polyline points="9 22 9 12 15 12 15 22"/></svg>');
}

.primary-nav button[data-view="lesson"]::before {
  -webkit-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z"/></svg>');
  mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z"/></svg>');
}

.primary-nav button[data-view="practice"]::before {
  -webkit-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M12 20h9"/><path d="M16.5 3.5a2.121 2.121 0 0 1 3 3L7 19l-4 1 1-4L16.5 3.5z"/></svg>');
  mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M12 20h9"/><path d="M16.5 3.5a2.121 2.121 0 0 1 3 3L7 19l-4 1 1-4L16.5 3.5z"/></svg>');
}

.primary-nav button[data-view="exam"]::before {
  -webkit-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>');
  mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>');
}

.primary-nav button[data-view="key"]::before {
  -webkit-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M22 2L12 12"/><path d="M16 8l4 4"/></svg>');
  mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M22 2L12 12"/><path d="M16 8l4 4"/></svg>');
}

.primary-nav button:hover {
  background-color: var(--color-brand-light);
  border-color: var(--color-line);
}

.primary-nav button[aria-selected="true"] {
  background-color: var(--color-brand);
  color: var(--color-surface);
  border-color: var(--color-brand);
  box-shadow: var(--shadow-sm);
}

/* App Status Announcer */
.app-status {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Main Container - Natural Heights, No Forced Viewport Scrollbars */
#app {
  width: min(100% - 2rem, var(--content-wide));
  margin-inline: auto;
  padding-block: clamp(1rem, 2vw, 2rem);
}

body.presentation-mode .site-header {
  display: none;
}

body.presentation-mode .app-status {
  display: none;
}

body.presentation-mode #app {
  width: 100%;
  max-width: none;
  min-height: 100dvh;
  padding: clamp(0.75rem, 2vw, 1.5rem);
}

.presentation-exit-floating {
  display: none;
}

body.presentation-mode .presentation-exit-floating {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  padding: 0.55rem 1.15rem;
  font: 700 0.88rem/1 var(--font-ui, system-ui, -apple-system, sans-serif);
  background: #173f35;
  color: #ffffff;
  border: 1.5px solid rgba(255, 255, 255, 0.45);
  border-radius: 9999px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.28);
  cursor: pointer;
  user-select: none;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

body.presentation-mode .presentation-exit-floating:hover {
  background: #a93226;
  border-color: #ffffff;
  transform: translateY(-1px);
}

/* Editorial Content Layout Elements */
.view-kicker {
  color: var(--color-accent);
  font: 800 var(--fs-xs)/1.2 var(--font-ui);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin: 0 0 var(--space-2) 0;
}

#view-title {
  margin: 0 0 var(--space-6) 0;
  color: var(--color-brand);
  font-family: var(--font-ui);
  font-size: clamp(var(--fs-2xl), 5vw, var(--fs-4xl));
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  scroll-margin-top: 8rem;
}

/* Dashboard Premium Open Generative UI Panel Styling */
.dashboard {
  max-width: var(--content-wide);
  display: grid;
  gap: var(--space-8);
}

.dashboard-hero {
  background: linear-gradient(135deg, var(--color-brand-deep) 0%, var(--color-brand) 65%, #1f5043 100%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  padding: clamp(2rem, 4vw, 3.5rem);
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
  color: #ffffff;
}

.dashboard-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 15%, rgba(45, 212, 191, 0.18) 0%, transparent 60%),
              radial-gradient(circle at 10% 90%, rgba(245, 158, 11, 0.12) 0%, transparent 50%);
  pointer-events: none;
}

.dashboard-hero::after {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  opacity: 0.8;
  pointer-events: none;
}

.dashboard-hero .view-kicker {
  color: var(--color-gold);
  font-weight: 850;
  letter-spacing: 0.18em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
}

.dashboard-hero #view-title {
  color: #ffffff;
  margin-top: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.hero-desc {
  font-family: var(--font-ui);
  font-size: var(--fs-lg);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.92);
  margin: var(--space-4) 0 0 0;
  max-width: var(--content-reading);
}

.dashboard-section-title {
  font: 850 var(--fs-xl)/1.2 var(--font-ui);
  color: var(--color-brand);
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.dashboard-section-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 1.2em;
  background: var(--color-accent);
  border-radius: var(--radius-full);
}

/* Stat Grid & Generative Cards */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: var(--space-4);
}

.stat-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.stat-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(22, 62, 51, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(22, 62, 51, 0.2);
}

.stat-card strong {
  display: block;
  font-family: var(--font-ui);
  font-size: var(--fs-3xl);
  font-weight: 850;
  line-height: 1.1;
  color: var(--color-brand);
  margin-bottom: var(--space-1);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.stat-card span {
  display: block;
  font: 750 var(--fs-xs)/1.2 var(--font-ui);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
}

.stat-detail {
  font-family: var(--font-ui);
  font-size: var(--fs-xs);
  line-height: 1.45;
  color: var(--color-muted);
  margin: 0;
}

/* Colored accent borders based on status */
.stat-card[data-stat="answered"] {
  border-top: 4px solid var(--color-brand);
}

.stat-card[data-stat="correct"] {
  border-top: 4px solid var(--color-success);
}

.stat-card[data-stat="wrong"] {
  border-top: 4px solid var(--color-accent);
}

.stat-card[data-stat="total"] {
  border-top: 4px solid var(--color-gold);
}

/* Dashboard Guide steps */
.dashboard-guide {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
  box-shadow: var(--shadow-sm);
}

.dashboard-guide h3 {
  font: 800 var(--fs-base)/1.2 var(--font-ui);
  color: var(--color-brand);
  margin: 0 0 var(--space-4) 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.guide-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: var(--space-4);
}

.guide-steps li {
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--color-ink);
  padding: var(--space-5);
  background-color: var(--color-canvas);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-brand);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.guide-steps li:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  background-color: var(--color-surface);
}

.guide-steps li strong {
  display: block;
  font-size: var(--fs-base);
  color: var(--color-brand);
  margin-bottom: var(--space-2);
}

/* Dashboard Action Buttons */
.dashboard-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-top: var(--space-2);
}

.dashboard-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-ui);
  font-weight: 750;
  font-size: var(--fs-sm);
  border-radius: var(--radius-md);
  min-width: 12rem;
  min-height: 48px;
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-brand);
  color: var(--color-surface);
  border: 1px solid var(--color-brand);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-brand-hover);
  border-color: var(--color-brand-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-brand-light);
  color: var(--color-brand);
  border: 1px solid rgba(22, 62, 51, 0.15);
}

.btn-secondary:hover {
  background-color: var(--color-surface);
  transform: translateY(-2px);
  border-color: var(--color-brand);
  box-shadow: var(--shadow-sm);
}

.storage-note {
  margin: var(--space-4) 0 0 0;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background-color: var(--color-warning-light);
  border: 1px solid var(--color-warning);
  color: var(--color-warning);
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  font-weight: 600;
}

/* Desktop and Responsive Layout Adjustments */
@media (max-width: 48rem) {
  .site-header {
    position: static;
  }

  .header-inner {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
  }
  .primary-nav {
    width: 100%;
  }
  .primary-nav button {
    flex: 1 1 8rem;
  }
}

/* Print Media Styles for clean Answer Key printing */
@media print {
  body {
    background-color: white !important;
    color: black !important;
  }
  header, 
  .primary-nav, 
  .app-status, 
  button[data-print],
  .view-kicker {
    display: none !important;
  }
  #app {
    width: 100% !important;
    max-width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
  }
  .key-table-wrap {
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
  }
  .answer-key table {
    width: 100% !important;
  }
  .answer-key th, 
  .answer-key td {
    padding: 6px 8px !important;
    border-bottom: 1px solid #ccc !important;
  }
}