/* ==========================================================================
   PENIXIO SHARED BASE STYLESHEET (shared.css)
   CSS resets, responsive layout grid, typography scale, buttons, badges,
   pills, navigation, and core utilities.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Reset & Box Sizing
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: hidden;
  max-width: 100vw;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  max-width: 100vw;
}

img, svg, picture, video {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   2. Typography Scale & Headings (Oswald + Bebas Neue + Nunito)
   -------------------------------------------------------------------------- */
h1, .h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.02em;
  text-transform: none;
  margin-bottom: 1rem;
}

h2, .h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.65rem, 3.2vw, 2.4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  text-transform: none;
  margin-bottom: 0.75rem;
}

h3, .h3 {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2.2vw, 1.6rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.02em;
  text-transform: none;
  margin-bottom: 0.5rem;
}

h4, .h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  text-transform: none;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  line-height: 1.55;
  font-weight: 600;
}

p:last-child {
  margin-bottom: 0;
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.55;
  color: var(--text-secondary);
  font-weight: 600;
  max-width: 680px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gold-text);
  background: var(--gold-bg);
  border: var(--card-border-width) solid var(--border-color);
  box-shadow: var(--shadow-sm);
  padding: 0.35rem 0.85rem;
  border-radius: var(--border-radius-pill);
  margin-bottom: 0.875rem;
  position: relative;
  z-index: 5;
}

.kicker {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 800;
  text-transform: none;
  letter-spacing: 0.02em;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
}

.trust-line {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
  text-transform: uppercase;
}

/* Rotated Accent Highlight Span (From Social Media Deck pk-hl) */
.pk-highlight,
.highlight-word {
  display: inline-block;
  background-color: var(--gold-bg);
  color: var(--gold-text);
  padding: 0 8px;
  border-radius: 3px;
  transform: rotate(-1.5deg);
  box-shadow: 4px 4px 0 rgba(0,0,0,0.18);
  margin: 0 2px;
  font-family: var(--font-heading);
  font-weight: 700;
  border: 1.5px solid var(--border-color);
}

/* Neo-Brutalist Decorative Geometric Shapes (From Social Media Deck) */
.pk-dec-circle {
  position: absolute;
  border-radius: 50%;
  background-color: var(--shape-1, var(--accent-primary));
  border: var(--card-border-width) solid var(--border-color);
  box-shadow: var(--shadow-md);
  z-index: 1;
  pointer-events: none;
}

.pk-dec-rect {
  position: absolute;
  border-radius: 4px;
  background-color: var(--shape-2, var(--accent-secondary));
  border: var(--card-border-width) solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transform: rotate(12deg);
  z-index: 1;
  pointer-events: none;
  opacity: 0.85;
}

/* Hero Section Full-Bleed Color Band */
.hero-band {
  background-color: var(--hero-bg, var(--bg-surface-alt));
  border-bottom: 3.5px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.stat-number-giant {
  font-family: var(--font-accent);
  font-size: clamp(3rem, 5vw, 4.25rem);
  font-weight: 800;
  line-height: 1;
  color: var(--accent-primary);
  margin-bottom: 0.35rem;
}

/* --------------------------------------------------------------------------
   3. Container & Layout Grid
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container-narrow {
  max-width: 860px;
}

.container-wide {
  max-width: 1360px;
}

.section {
  padding-top: clamp(3rem, 6vw, 5.5rem);
  padding-bottom: clamp(3rem, 6vw, 5.5rem);
  position: relative;
}

.section-alt {
  background-color: var(--bg-surface-alt);
  border-top: var(--card-border-width) solid var(--border-color);
  border-bottom: var(--card-border-width) solid var(--border-color);
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 {
  grid-template-columns: 1fr;
}

.grid-3 {
  grid-template-columns: 1fr;
}

.grid-4 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gap-sm { gap: 0.5rem; }
.gap-md { gap: 1rem; }
.gap-lg { gap: 1.5rem; }
.gap-xl { gap: 2rem; }

/* --------------------------------------------------------------------------
   4. Buttons & Interactive Controls (Neo-Brutalist Hard Cutouts)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.15;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-radius: var(--border-radius-sm);
  border: var(--card-border-width) solid var(--border-color);
  cursor: pointer;
  box-shadow: var(--button-shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease;
  text-align: center;
  white-space: nowrap;
}

.btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow-lg);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #FFFFFF;
  border-color: var(--border-color);
  box-shadow: var(--button-shadow);
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-alt);
  border-color: var(--border-color);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-ghost:hover {
  background-color: var(--bg-surface);
}

.btn-pill {
  border-radius: var(--border-radius-pill);
}

.btn-lg {
  padding: 0.95rem 2rem;
  font-size: 1.15rem;
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.8125rem;
}

/* --------------------------------------------------------------------------
   5. Cards & Surface Containers (Pure White Cutout Cards)
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--bg-surface);
  border: var(--card-border-width) solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
  overflow: hidden;
}

.card.featured,
.card:has(.pricing-badge) {
  overflow: visible;
}

.card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
}

.card-elevated {
  box-shadow: var(--shadow-lg);
}

/* --------------------------------------------------------------------------
   6. Badges, Chips & Pills
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.75rem;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--border-radius-sm);
  border: var(--card-border-width) solid var(--border-color);
  box-shadow: var(--shadow-sm);
  background-color: var(--bg-surface);
  color: var(--text-primary);
}

.badge-syllabus {
  background-color: var(--gold-bg);
  color: var(--gold-text);
  border-color: var(--border-color);
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.badge-success {
  background-color: #06D6A0;
  color: #1A1A1A;
  border-color: var(--border-color);
}

.badge-accent {
  background-color: var(--accent-primary);
  color: #FFFFFF;
  border-color: var(--border-color);
}

/* Filter Chips */
.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0;
}

.chip {
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  border-radius: var(--border-radius-pill);
  border: var(--card-border-width) solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all 0.12s ease;
}

.chip:hover {
  background-color: var(--bg-surface-alt);
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow-md);
}

.chip.active {
  background-color: var(--accent-primary);
  color: #FFFFFF;
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

/* --------------------------------------------------------------------------
   7. Header & Navigation Bar
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-surface);
  border-bottom: var(--card-border-width) solid var(--border-color);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
  padding: 0 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 700;
  font-family: var(--font-heading);
  color: var(--text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo-img {
  height: 44px;
  width: auto;
  max-height: 48px;
  object-fit: contain;
  vertical-align: middle;
  display: block;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background-color: var(--accent-primary);
  color: #FFFFFF;
  font-weight: 800;
  border-radius: var(--border-radius-sm);
  border: 1.5px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.nav-mobile-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 40px;
  height: 38px;
  background-color: var(--bg-surface-alt);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 8px 7px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
  flex-shrink: 0;
  position: relative;
  z-index: 101;
}

.nav-mobile-toggle:hover {
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow-md);
  background-color: var(--bg-surface);
}

.nav-mobile-toggle:active {
  transform: translate(1px, 1px);
  box-shadow: none;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2.5px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
  transform-origin: center;
}

.nav-mobile-toggle.active .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-mobile-toggle.active .nav-toggle-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-mobile-toggle.active .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Universal Hamburger Dropdown Menu (All Viewports) */
.nav-links {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 1.5rem;
  width: 250px;
  background-color: var(--bg-surface);
  border: var(--card-border-width) solid var(--border-color);
  border-radius: var(--border-radius-md);
  box-shadow: 6px 6px 0px var(--border-color);
  padding: 0.75rem;
  flex-direction: column;
  gap: 0.35rem;
  z-index: 1000;
}

.nav-links.nav-open,
.nav-links.active {
  display: flex;
  animation: navDropdownFade 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes navDropdownFade {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.nav-link {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.65rem 0.9rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  border: 1.5px solid transparent;
  transition: all 0.12s ease;
}

.nav-link:hover,
.nav-link.active {
  background-color: var(--bg-surface-alt);
  border-color: var(--border-color);
  color: var(--accent-primary);
  transform: translateX(3px);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .nav-links {
    right: 1rem;
    left: 1rem;
    width: auto;
  }
}

/* --------------------------------------------------------------------------
   Media Image Frames (Neo-Brutalist Framed Imagery)
   -------------------------------------------------------------------------- */
.hero-media-frame {
  background-color: var(--bg-surface);
  border: var(--card-border-width) solid var(--border-color);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
  z-index: 5;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hero-media-frame:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0px var(--border-color);
}

.hero-media-frame picture,
.hero-media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.story-media-card {
  background-color: var(--bg-surface);
  border: var(--card-border-width) solid var(--border-color);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.story-media-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
}

.story-media-card picture,
.story-media-card img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 400px;
  object-fit: cover;
}

.story-media-caption {
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-surface);
  border-top: 1.5px solid var(--border-color);
}

@media (max-width: 640px) {
  .nav-container {
    flex-wrap: wrap;
    height: auto;
    padding: 0.5rem 1rem;
    row-gap: 0.45rem;
  }

  .brand-logo {
    font-size: 1.15rem;
    gap: 0.45rem;
  }

  .brand-logo-img {
    height: 34px;
    max-height: 36px;
  }

  .nav-audience-switcher {
    order: 3;
    width: 100%;
    display: flex;
    justify-content: center;
    margin: 0.15rem 0 0.1rem;
  }

  .audience-btn {
    flex: 1;
    text-align: center;
    padding: 0.35rem 0.45rem;
    font-size: 0.725rem;
  }

  .nav-actions {
    gap: 0.45rem;
  }

  .nav-actions .btn-sm {
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
  }
}

/* --------------------------------------------------------------------------
   8. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: var(--card-border-width) solid var(--border-color);
  padding: 4rem 1.5rem 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  max-width: 1200px;
  margin: 0 auto 3rem;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .footer-grid {
    grid-template-columns: 2fr repeat(3, 1fr);
  }
}

.footer-col h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-col a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.footer-col a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
  }
}

/* --------------------------------------------------------------------------
   9. Responsive Utilities & Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .btn {
    white-space: normal !important;
    text-align: center;
    max-width: 100%;
  }
}

@media (max-width: 576px) {
  .hide-sm { display: none !important; }
  .btn-lg {
    width: 100%;
    padding: 0.85rem 1.25rem;
    font-size: 1.05rem;
  }
}

@media (max-width: 768px) {
  .hide-md { display: none !important; }
  .text-center-sm { text-align: center; }

  /* Hide distracting background decorative circles on mobile viewports */
  .pk-dec-circle {
    display: none !important;
  }

  /* Mobile Hero Stacking & Compaction (P0 Milestone 2) */
  .hero-section {
    padding-top: 1.75rem !important;
    padding-bottom: 2.25rem !important;
  }
  .hero-grid {
    gap: 1.5rem !important;
  }
  .hero-copy-col {
    display: flex;
    flex-direction: column;
  }
  .hero-preview-col {
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
  }
  .hero-preview-col .worksheet-preview-card {
    padding: 1.1rem !important;
  }
  .hero-preview-col .worksheet-paper {
    min-height: auto !important;
    padding: 1rem !important;
  }

  /* Diagnostic probe section — start higher on mobile */
  #diagnostic-probe .section-head {
    margin-bottom: 1.25rem !important;
  }
  #diagnostic-probe .section-head h2 {
    font-size: clamp(1.35rem, 5vw, 1.75rem) !important;
  }
  #diagnostic-probe .section-head p {
    font-size: 0.9rem !important;
    margin-bottom: 0 !important;
  }

  /* Diagnostic card: squeeze horizontal padding on small phones */
  .diagnostic-card {
    padding: 1rem 0.85rem !important;
  }
}

@media (min-width: 769px) {
  .show-sm { display: none !important; }
}