/**
 * AICAER Global Design System
 * AI Chat Adverse Events Registry
 *
 * Architecture: CSS Custom Properties + BEM-like naming
 * Aesthetic: "Refined Academic" — dense, clinical, trustworthy
 */

/* ==========================================================================
   1. CSS RESET & NORMALIZE
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  font-variant-numeric: tabular-nums;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* Smooth scroll for anchor links - respects reduced motion preference */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* Prevent layout shift when overlay opens and scrollbar disappears */
html {
  scrollbar-gutter: stable;
}

/* Match scrollbar gutter to scrim color when sidebar is open */
html.sidebar-open {
  background-color: rgba(0, 0, 0, 0.5);
}

body {
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;  /* Prevent horizontal scroll from minor overflow */
}

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

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

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* ==========================================================================
   2. DESIGN TOKENS (CSS Custom Properties)
   ========================================================================== */

:root {
  /* ===== BRAND ===== */
  --color-primary: #a87fa8;
  --color-primary-hover: #8a6a8a;
  --color-primary-tint: #f0e6f6;

  /* ===== SURFACES ===== */
  --color-surface: #ffffff;
  --color-surface-raised: #f8f9fa;
  --color-surface-inset: #eaecf0;
  --color-background: #f8f9fa;

  /* ===== TEXT ===== */
  --color-text: #202122;
  --color-text-muted: #72777d;
  --color-text-disabled: #a2a9b1;
  --color-link: #0645ad;
  --color-link-hover: #0b0080;
  --color-link-visited: #8a6a8a;

  /* ===== BORDERS ===== */
  --color-border: #a2a9b1;
  --color-border-light: #c8ccd1;

  /* ===== FEEDBACK ===== */
  --color-error: #D32F2F;
  --color-error-bg: #fff5f5;
  --color-success: #2e7d32;
  --color-success-bg: #e8f5e9;

  /* ===== NOTICE BOXES ===== */
  --color-notice-warning-bg: #fff3cd;
  --color-notice-warning-border: #ffe000;
  --color-notice-info-bg: #e8f4f8;
  --color-notice-info-border: #b8d4e3;

  /* ===== SPACING SCALE ===== */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* ===== TYPOGRAPHY ===== */
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.75rem;     /* 28px */

  /* ===== LAYOUT ===== */
  --sidebar-width: 220px;
  --sidebar-width-slim: 180px;
  --content-max-width: 800px;
  --border-radius: 0;  /* Sharp corners - per design system */
  --document-start: 20px;  /* Desktop: aligns document with sidebar logo divider HR */
  --mobile-nav-clearance: 60px;  /* DEPRECATED: No longer needed with sticky mobile-header */

  /* ===== SIDEBAR TIMING ===== */
  /* Snappy, refined academic feel - quick response without feeling rushed */
  --sidebar-transition-duration: 100ms;
  --sidebar-transition-easing: cubic-bezier(0.4, 0, 0.2, 1);  /* Material "standard" curve */
  --sidebar-focus-delay: 50ms;
  --sidebar-scroll-delay: 100ms;

  /* ===== VERTICAL RHYTHM ===== */
  --section-gap: 48px;
  --card-gap: 24px;
  --content-padding: 32px;
}

/* ==========================================================================
   3. BASE TYPOGRAPHY
   ========================================================================== */

body {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: #f0f2f5;  /* "Desk" surface - darker grey for paper contrast */
}

/* Headings use sans-serif for UI clarity */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.3;
}

h1 {
  font-family: var(--font-serif);
  font-size: var(--font-size-3xl);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

h2 {
  font-size: var(--font-size-lg);
}

h3 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

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

/* Links */
a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

a:visited {
  color: var(--color-link-visited);
}

/* Override visited state for UI elements (buttons, nav) */
.btn:visited,
.btn:visited:hover {
  color: inherit;
}

.btn--primary:visited {
  color: #ffffff;
  background-color: var(--color-primary);
}

.btn--primary:visited:hover {
  color: #ffffff;
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.nav-item:visited {
  color: var(--color-text);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Small/meta text */
small, .text-sm {
  font-size: var(--font-size-sm);
}

.text-muted {
  color: var(--color-text-muted);
}

/* Section labels (uppercase, small) */
.section-label {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  scroll-margin-top: var(--space-sm);  /* Minimal breathing room on desktop, mobile overrides to 60px */
}

/* ==========================================================================
   4. LAYOUT SYSTEM
   ========================================================================== */

.layout {
  display: flex;
  min-height: 100vh;
}

.main-content {
  flex: 1;
  padding: var(--content-padding);
  max-width: calc(var(--content-max-width) + var(--content-padding) * 2);
  margin-left: var(--sidebar-width);  /* Offset for fixed sidebar */
}

/* ==========================================================================
   5. SIDEBAR
   ========================================================================== */

.sidebar {
  width: var(--sidebar-width);
  height: 100vh;   /* Fallback for older browsers */
  height: 100dvh;  /* Dynamic viewport height - accounts for mobile browser chrome */
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
}

.sidebar__logo {
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar__logo img {
  height: 32px;
  width: auto;
  margin-bottom: var(--space-xs);
}

/* Tagline/URL inside logo block (desktop view) */
.sidebar__logo .sidebar__tagline,
.sidebar__logo .sidebar__url {
  display: block;
}

.sidebar__tagline {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  line-height: 1.3;
}

.sidebar__logo-divider {
  margin: 4px 0;
  border: none;
  border-top: 1px solid var(--color-border-light);
}

.sidebar__url {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-muted);
  line-height: 1.3;
}

.sidebar__nav {
  flex: 1;
  padding: var(--space-md) 0;
}

.sidebar__footer {
  margin-top: auto;
  padding: var(--space-md);
  border-top: 1px solid var(--color-border-light);
  display: none; /* Hidden on desktop - tagline/URL shown under logo instead */
}

.sidebar__footer .sidebar__tagline,
.sidebar__footer .sidebar__url {
  display: block;
}

.nav-item {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  border-left: 4px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.nav-item:hover {
  background-color: var(--color-surface-raised);
  text-decoration: none;
}

.nav-item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.nav-item--active {
  background-color: var(--color-primary-tint);
  border-left-color: var(--color-primary);
  color: var(--color-text);
  font-weight: 600;
}

/* Progress tracker (nested under Submit a Report) */
.progress-tracker {
  padding-left: var(--space-xl);
  margin-top: var(--space-xs);
}

.progress-step {
  display: block;
  padding: var(--space-xs) var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  border-left: 3px solid var(--color-border-light);
}

.progress-step--completed {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

.progress-step--current {
  color: var(--color-text);
  font-weight: 600;
  background-color: var(--color-primary-tint);
  border-left-color: var(--color-primary);
}

.progress-step--locked {
  color: var(--color-text-disabled);
  cursor: not-allowed;
}

/* Prevent visited state from overriding nav UI colors */
.progress-step:visited {
  color: var(--color-text-muted);
}

.progress-step--current:visited {
  color: var(--color-text);
}

.progress-step--completed:visited {
  color: var(--color-primary);
}

.progress-step--locked:visited {
  color: var(--color-text-disabled);
}

/* DEPRECATED: .sidebar__footer removed - footer now sits on desk below paper */

/* Sidebar section divider */
.sidebar__divider {
  margin: var(--space-md) var(--space-lg);
  border: none;
  border-top: 1px solid var(--color-border-light);
}

/* Coming soon section */
.nav-section-label {
  display: block;
  padding: var(--space-md) var(--space-lg) var(--space-xs);
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.nav-item--disabled {
  color: var(--color-text-disabled);
  cursor: not-allowed;
}

.nav-item--disabled:hover {
  background-color: transparent;
}

.nav-item--meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ==========================================================================
   6. BUTTONS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Primary button (purple fill) */
.btn--primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  text-decoration: none;
  color: #ffffff;
}

/* Secondary button (outlined) */
.btn--secondary {
  background-color: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  background-color: var(--color-surface-raised);
  text-decoration: none;
}

/* Ghost button (minimal) */
.btn--ghost {
  background-color: transparent;
  color: var(--color-link);
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
}

.btn--ghost:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

/* Disabled state */
.btn:disabled,
.btn--disabled {
  background-color: var(--color-surface-raised);
  color: var(--color-text-disabled);
  border-color: var(--color-border-light);
  cursor: not-allowed;
}

/* ==========================================================================
   6.5 INPUT GROUPS
   Attached input + button combinations (newsletter signup, search, etc.)
   ========================================================================== */

.input-group {
  display: flex;
  align-items: stretch;
}

.input-group .form-input {
  flex: 1;
  border-right: none;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.input-group .form-input:focus {
  z-index: 1;  /* Ensure focus ring shows above adjacent button */
  position: relative;
}

.input-group .btn {
  flex-shrink: 0;
  align-self: stretch;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

/* Subscribe form: name field + email/button group inline */
.subscribe-row {
  display: flex;
  gap: var(--space-md);
  min-width: 0;
}

.subscribe-row > .form-input {
  flex: 2;
  min-width: 0;
}

.subscribe-row > .input-group {
  flex: 3;
  min-width: 0;
}

/* Normalize heights: set consistent height on all interactive elements */
.subscribe-row .form-input,
.subscribe-row .btn {
  height: 39px;
  box-sizing: border-box;
  margin: 0;
}

/* Ensure button aligns with input inside input-group */
.subscribe-row .input-group {
  align-items: center;
}

.subscribe-row .input-group .form-input {
  height: 39px;
  min-height: 39px;
  max-height: 39px;
  padding: 8px 16px;
  line-height: 1.5;
  box-sizing: border-box;
  margin: 0;
}

.subscribe-row .input-group .btn {
  height: 39px;
  min-height: 39px;
  max-height: 39px;
  box-sizing: border-box;
  margin: 0;
}

/* Tablet and mobile: stack name above email+button */
@media (max-width: 950px) {
  .subscribe-row {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .subscribe-row > .form-input,
  .subscribe-row > .input-group {
    flex: none;
    width: 100%;
  }
}

/* Ensure email + button stay inline on all mobile screens */
@media (max-width: 950px) {
  .subscribe-row .input-group {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: stretch;
    width: 100%;
  }

  .subscribe-row .input-group .form-input {
    display: block;
    flex: 1 1 0%;
    min-width: 0;
    width: auto;
    border-right: none;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
  }

  .subscribe-row .input-group .btn {
    display: inline-flex;
    flex: 0 0 auto;
    width: auto;
    white-space: nowrap;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
  }
}

/* Tighter button padding on narrow screens */
@media (max-width: 500px) {
  .subscribe-row .input-group .btn {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }
}

/* ==========================================================================
   7. NOTICE BOXES
   ========================================================================== */

.notice {
  padding: var(--space-md);
  border-radius: var(--border-radius);
  border-left: 4px solid;
  margin-bottom: var(--space-lg);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
}

.notice--warning {
  background-color: var(--color-notice-warning-bg);
  border-left-color: var(--color-notice-warning-border);
}

.notice--info {
  background-color: var(--color-notice-info-bg);
  border-left-color: var(--color-notice-info-border);
}

.notice strong {
  font-family: var(--font-sans);
  font-weight: 600;
}

.notice a {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* ==========================================================================
   8. HERO SECTION (Landing Page)
   ========================================================================== */

.hero {
  margin-bottom: var(--section-gap);
}

.hero__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-3xl);
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-sm);
}

.hero__description {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  max-width: 600px;
  margin-bottom: var(--space-sm);
}

.hero__link {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* ==========================================================================
   9. FLOW CARDS (Landing Page User Paths)
   ========================================================================== */

.flow-section {
  margin-bottom: var(--section-gap);
}

.flow-card {
  margin-bottom: var(--card-gap);
}

.flow-card:last-child {
  margin-bottom: 0;
}

/* Primary card (User Self-Report) - most prominent */
.flow-card--primary {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-lg);
  padding-right: 27px;  /* 27px + 1px border = 28px (matches left: 24px + 4px border) */
}

/* Secondary card (Provider) */
.flow-card--secondary {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  padding: var(--space-lg) var(--space-md);
  padding-left: 27px;  /* 27px + 1px border = 28px (aligns with primary's 24px + 4px) */
}

/* Tertiary cards (Share, Follow-up) */
.flow-card--tertiary {
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border-light);
  padding: var(--space-md);
  padding-left: 27px;  /* 27px + 1px border = 28px (aligns with primary's 24px + 4px) */
}

.flow-card__title {
  font-family: var(--font-sans);
  font-size: var(--font-size-lg);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}

.flow-card--tertiary .flow-card__title {
  font-size: var(--font-size-base);
}

.flow-card__description {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  line-height: 1.5;
  margin-bottom: var(--space-sm);
}

.flow-card--tertiary .flow-card__description {
  font-size: var(--font-size-sm);
}

.flow-card__meta {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: auto;
  margin-bottom: var(--space-sm);
}

.flow-card .btn {
  margin-top: var(--space-sm);
}

/* Row layout for tertiary cards */
.flow-card-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

/* Equal-height cards with bottom-aligned buttons */
.flow-card-row--equal {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.flow-card-row--equal .flow-card {
  display: flex;
  flex-direction: column;
  margin-bottom: 0;
}

.flow-card__content {
  flex: 1;
}

.flow-card-row--equal .btn {
  margin-top: auto;
  align-self: flex-start;
}

/* Steps list styling (for User Report card) */
.flow-card__steps {
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  margin: var(--space-sm) 0;
  padding-left: var(--space-lg);
  line-height: 1.5;
}

.flow-card__steps li {
  margin-bottom: var(--space-xs);
}

/* Hint text styling (for OBO card) */
.flow-card__hint {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

/* Disclaimer styling (subtle footnote-style) */
.flow-card__disclaimer {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border-light);
}

/* ==========================================================================
   10. ABOUT SECTION (Landing Page)
   ========================================================================== */

.about-section {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}

.about-section p {
  font-family: var(--font-serif);
  max-width: 600px;
}

.about-section__links {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.about-section__links a {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* ==========================================================================
   11. SITE FOOTER

   Sits on the "grey desk" below the white paper.
   Aligned with document max-width for visual consistency.
   ========================================================================== */

.site-footer {
  max-width: calc(var(--content-max-width) + var(--content-padding) * 2);  /* 864px - matches main content */
  margin-left: var(--sidebar-width);
  margin-top: var(--space-xl);
  padding: var(--space-lg) var(--content-padding);
  border-top: 1px solid var(--color-border-light);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: left;
}

.site-footer p {
  margin-bottom: var(--space-xs);
}

.site-footer p:last-child {
  margin-bottom: 0;
}

.site-footer a {
  color: var(--color-text-muted);
}

.site-footer a:hover {
  color: var(--color-link);
}

.footer-disclosure {
  font-size: var(--font-size-xs);  /* 12px */
  /* TODO: Consider #626568 (~5:1) if WCAG AA audit requires stricter compliance */
}

/* Document pages: footer sits directly under document */
body.page-content .site-footer,
body.page-form .site-footer,
body.page-pledge .site-footer {
  margin-top: 0;
}

/* Hide redundant footer link when on that page */
body.page-crisis .footer-link--crisis,
body.page-legal .footer-link--legal,
body.page-privacy .footer-link--privacy,
body.page-terms .footer-link--terms {
  display: none;
}

/* ==========================================================================
   12. SKIP LINK (Accessibility)
   ========================================================================== */

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  background-color: var(--color-primary);
  color: #ffffff;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 600;
  z-index: 1000;
  border-radius: var(--border-radius);
}

.skip-link:focus {
  top: var(--space-md);
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
  color: #ffffff;
  text-decoration: none;
}

/* ==========================================================================
   13. MOBILE PROGRESS BAR (Sticky Bottom)
   ========================================================================== */

.mobile-progress {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  z-index: 100;
}

.mobile-progress__label {
  font-weight: 600;
  color: var(--color-text);
}

.mobile-progress__steps {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-xs);
}

.mobile-progress__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-border-light);
}

.mobile-progress__dot--completed {
  background-color: var(--color-primary);
}

.mobile-progress__dot--current {
  background-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-primary);
}

/* Docked state: progress bar flows in document instead of fixed to viewport */
.mobile-progress--docked {
  position: relative;
  bottom: auto;
}

/* ==========================================================================
   14. HAMBURGER MENU (Mobile Only)
   ========================================================================== */

.hamburger-btn {
  display: none;
  position: fixed;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 200;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  padding: var(--space-md);  /* Larger tap target for accessibility (44px+ minimum) */
  cursor: pointer;
}

.hamburger-icon {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  position: relative;
}

.hamburger-icon::before,
.hamburger-icon::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  left: 0;
}

.hamburger-icon::before {
  top: -6px;
}

.hamburger-icon::after {
  bottom: -6px;
}

/* Hamburger-to-X animation */
.hamburger-btn[aria-expanded="true"] .hamburger-icon {
  background-color: transparent;
}

.hamburger-btn[aria-expanded="true"] .hamburger-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.hamburger-btn[aria-expanded="true"] .hamburger-icon::after {
  bottom: 0;
  transform: rotate(-45deg);
}

/* Only animate if user hasn't requested reduced motion */
@media (prefers-reduced-motion: no-preference) {
  .hamburger-icon,
  .hamburger-icon::before,
  .hamburger-icon::after {
    transition: all 0.2s ease-in-out;
  }
}

/* ==========================================================================
   15. RESPONSIVE BREAKPOINTS
   ========================================================================== */

/* Desktop: ≥1200px (default styles above) */

/* Tablet / Half-width: 700-1199px */
@media (max-width: 1199px) {
  :root {
    --sidebar-width: var(--sidebar-width-slim);
  }

  .sidebar__logo {
    padding: var(--space-md);
  }

  .nav-item {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.8125rem;  /* 13px - between xs(12) and sm(14) */
  }

  .main-content {
    padding: var(--space-lg);
    margin-left: var(--sidebar-width-slim);
  }

  .site-footer {
    margin-left: var(--sidebar-width-slim);
    padding: var(--space-md) var(--space-lg);
  }

  /* Form page footer alignment - match intake-document when main-content has no padding */
  .page-form .site-footer,
  .page-pledge .site-footer {
    padding-left: var(--space-xl);  /* Match intake-document internal padding */
  }
}

/* Mobile: ≤699px */
@media (max-width: 699px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    width: var(--sidebar-width);  /* Match desktop width (220px) */
    z-index: 150;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
  }

  /* Animate sidebar and overlay - respects reduced motion preference */
  .sidebar {
    transition: left var(--sidebar-transition-duration) var(--sidebar-transition-easing);
  }

  .sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 140;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--sidebar-transition-duration) var(--sidebar-transition-easing),
                visibility var(--sidebar-transition-duration) var(--sidebar-transition-easing);
  }

  @media (prefers-reduced-motion: reduce) {
    .sidebar,
    .sidebar-overlay {
      transition: none;
    }
  }

  .sidebar--open {
    left: 0;
  }

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

  .sidebar__nav {
    padding-top: 54px; /* Space for fixed hamburger button */
  }

  /* Show footer on mobile (logo area is hidden, footer shows tagline/URL instead) */
  .sidebar__footer {
    display: block;
  }

  .hamburger-btn {
    display: block;
  }

  .main-content {
    padding: var(--space-md);
    max-width: none;
    margin-left: 0;  /* Sidebar hidden on mobile */
  }

  /* Anchor scroll offset to clear sticky mobile header */
  .section-header,
  .section-label {
    scroll-margin-top: 60px;  /* Approximate mobile header height */
  }

  .site-footer {
    margin-left: 0;
    padding: var(--space-md);
  }

  /* Show mobile progress bar on form pages */
  .page-form .mobile-progress {
    display: block;
  }

  .page-form .main-content {
    padding-bottom: 80px; /* Space for mobile progress */
  }

  /* Form page footer - normal padding since progress bar docks above it */
  .page-form .site-footer {
    padding-bottom: var(--space-md);
  }

  /* Hero adjustments */
  .hero__title {
    font-size: var(--font-size-2xl);
  }

  /* Card row stacks on mobile */
  .flow-card-row,
  .flow-card-row--equal {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   16. PRINT STYLES
   ========================================================================== */

@media print {
  .sidebar,
  .hamburger-btn,
  .mobile-progress,
  .skip-link,
  .site-footer {
    display: none !important;
  }

  .layout {
    display: block;
  }

  .main-content {
    padding: 0;
    max-width: none;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .notice {
    border: 1px solid #000;
    background: #fff;
  }
}

/* ==========================================================================
   17. UTILITY CLASSES
   ========================================================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.visually-hidden:not(:focus):not(:active) {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

/* ==========================================================================
   18. SECTION STRUCTURE (used by both content and form pages)
   ========================================================================== */

/* Section header (grey bar + purple accent) */
.section-header {
  background-color: var(--color-surface-inset);
  border-left: 4px solid var(--color-primary);
  padding: 12px var(--space-md);
  margin: var(--space-lg) 0 0 0;
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

.section-header:first-child,
.part-header + .section-header,
.page-header + .section-header {
  margin-top: 0;
}

.section-header h2 {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text);
  margin: 0;
}

/* Section number (optional - for forms) */
.section-header .section-number {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Section optional label */
.section-header .section-optional {
  font-weight: 400;
  text-transform: none;
  color: var(--color-text-muted);
  letter-spacing: 0;
}

/* Section body (indented content under header) */
.section-body {
  padding: var(--space-md) 0 var(--space-lg) var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.section-body:last-of-type {
  border-bottom: none;
}

/* State variants */
.section-header--error {
  border-left-color: var(--color-error);
}

.section-header--error .section-number {
  color: var(--color-error);
}

.section-header--warning {
  border-left-color: var(--color-notice-warning-border);
}

/* Error overrides warning */
.section-header--warning.section-header--error {
  border-left-color: var(--color-error);
}

.section-header--warning.section-header--error .section-number {
  color: var(--color-error);
}

/* ==========================================================================
   19. CONTENT PAGES (crisis.html, methodology.html, privacy.html, etc.)
   ========================================================================== */

/* Paper surface for content documents */
.content-document {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  max-width: 800px;
  margin: 52px auto 0;  /* No bottom margin - footer border-top provides separation */
  padding: var(--space-xl);
}

/* Page header (purple banner for content pages) */
.page-header {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: var(--space-md) var(--space-lg);
  /* Bleed to paper edges - counteract .content-document padding */
  margin: calc(-1 * var(--space-xl));
  margin-bottom: var(--space-lg);
}

.page-header__title {
  font-family: var(--font-sans);
  font-size: var(--font-size-lg);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: #ffffff;
  margin: 0;
}

/* Data text - mono font for phone numbers, reference IDs, URLs */
.text-data {
  font-family: var(--font-mono);
  font-size: 0.9em;
  white-space: nowrap;
}

/* Utility: prevent line breaks in key phrases (e.g., "9-1-1") */
.nowrap {
  white-space: nowrap;
}

/* Resource labels - interface tier (sans) for "Website:", "Call:", etc. */
.resource-label {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.875rem;
}

/* Indented contact details under org name - grey connector bar */
.resource-details {
  margin-left: 1rem;
  margin-top: 0.5rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--color-border-light);
}

.resource-details p {
  margin-bottom: 0.25rem;
}

/* Section jump navigation */
.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
  margin-bottom: var(--space-lg);
  font-family: var(--font-sans);
  font-size: 0.875rem;
}

.section-nav__label {
  color: var(--color-text-muted);
}

.section-nav a {
  color: var(--color-link);
  text-decoration: none;
}

.section-nav a:hover {
  text-decoration: underline;
}

/* Resource article spacing within section body */
.section-body article {
  margin-bottom: var(--space-lg);
}

.section-body article:last-child {
  margin-bottom: 0;
}

/* Article dividers within section body */
.section-body hr {
  border: none;
  border-top: 1px solid var(--color-border-light);
  margin: var(--space-md) 0;
}

/* --- Content Page Responsive Adjustments --- */

/* Desktop: Align document with sidebar branding baseline */
@media (min-width: 1200px) {
  .content-document {
    margin-top: var(--document-start);
  }
}

/* Split-screen & Tablet: Paper pinned to spine */
@media (max-width: 1199px) and (min-width: 700px) {
  .page-content .main-content {
    padding: 0;
    max-width: none;
  }

  .content-document {
    max-width: 794px;
    margin: 0;
    border: none;
    border-right: 1px solid var(--color-border-light);
  }
}

/* Mobile: Edge-to-edge, no padding (sticky mobile-header handles nav) */
@media (max-width: 699px) {
  .page-content .main-content {
    padding: 0;
    max-width: none;
  }

  .content-document {
    margin: 0;
    border: none;
    padding: var(--space-md);
  }

  .page-header {
    margin: calc(-1 * var(--space-md));
    margin-bottom: var(--space-md);
  }
}

/* Print enhancement for notices */
@media print {
  .notice {
    border: 1px solid #000;
  }
}

/* ==========================================================================
   SPLASH PAGE STYLES

   NeurIPS conference landing page - minimal layout with email capture.
   ========================================================================== */

.sidebar--splash {
  justify-content: flex-start;
}

/* Crisis notice spacing */
.page-splash .notice {
  margin-top: var(--space-2xl);
  margin-bottom: 0;
}

/* Splash page section label spacing */
.page-splash .section-label {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.page-splash .section-label:first-of-type {
  margin-top: 0;
}

/* Splash page subscribe form - tighter spacing */
.page-splash .subscribe-form {
  margin-top: var(--space-sm);
}

.page-splash .subscribe-form__status:empty {
  min-height: 0;
  margin-top: 0;
}

/* Status badge - styled like nav-item--active */
.status-badge {
  background-color: var(--color-primary-tint);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.status-badge--compact {
  font-size: var(--font-size-xs);
  padding: var(--space-xs) var(--space-sm);
  border-left-width: 3px;
}

/* DEPRECATED: .sidebar__independence, .sidebar__footer, .sidebar__copyright removed
   Footer content now lives in unified .site-footer below the layout div.
   These styles kept temporarily for backwards compatibility during migration. */

.sidebar__independence {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
  padding: var(--space-sm) var(--space-md);
  margin: 0;
}

.sidebar__footer {
  margin-top: auto;
  padding: var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
}

.sidebar__footer p {
  margin: 0 0 var(--space-xs) 0;
}

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

.sidebar__footer .sidebar__independence {
  padding: 0;
  margin-bottom: var(--space-sm);
}

.sidebar__footer .sidebar__divider {
  margin: 0 0 var(--space-sm) 0;
}

.sidebar__copyright {
  color: var(--color-text-muted);
}

/* Subscribe form */
.subscribe-form {
  margin-top: var(--space-md);
}

.subscribe-form .form-input {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.subscribe-form .form-input:focus {
  border-color: var(--color-primary);
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.subscribe-form .form-input::placeholder {
  color: var(--color-text-muted);
}

.subscribe-form__status {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  margin-top: var(--space-sm);
  min-height: 1.5em;
}

.subscribe-form__status--success {
  color: var(--color-text);
}

.subscribe-form__status--error {
  color: var(--color-error);
}

/* ==========================================================================
   MOBILE HEADER (Unified - All Pages)

   Contains: hamburger button, logo, status badge
   Displayed at ≤699px viewport width
   ========================================================================== */

.mobile-header {
  display: none;
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--space-sm) var(--space-md);
  align-items: center;
  gap: var(--space-sm);
}

.mobile-header__logo {
  flex: 1;
  display: flex;
  align-items: center;
}

.mobile-header__logo img {
  height: 34px;
  width: auto;
}

/* Hamburger button when inside mobile header - relative positioning */
.mobile-header .hamburger-btn {
  position: static;
  display: block;
  z-index: auto;
  background: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  padding: var(--space-sm);
  cursor: pointer;
  flex-shrink: 0;
}

.mobile-header .hamburger-btn:hover {
  background: var(--color-surface-raised);
}

.mobile-header .hamburger-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* DEPRECATED: .mobile-footer removed - use .site-footer instead */

@media (max-width: 699px) {
  /* Show mobile header on all pages */
  .mobile-header {
    display: flex;
  }

  /* Hide sidebar logo on mobile (mobile-header has it) */
  .sidebar__logo {
    display: none;
  }

  /* Show footer on mobile (hidden on desktop where tagline is under logo) */
  .sidebar__footer {
    display: block;
  }

  /* Hide sidebar on splash pages (drawer still works on form pages) */
  .sidebar--splash {
    display: none;
  }

  /* Allow sidebar--splash to open as drawer when hamburger clicked */
  .sidebar--splash.sidebar--open {
    display: flex;
  }

  /* Content pages with splash sidebar need adjusted main-content */
  .page-content .main-content {
    margin-left: 0;
  }

  .page-splash .main-content {
    padding: var(--space-md);
    margin-left: 0;
  }

  .page-splash .layout {
    flex-direction: column;
  }

}

/* ==========================================================================
   CONFIRMATION PAGE STYLES
   ========================================================================== */

.page-confirm {
  background-color: var(--color-background);
}

.confirm-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.confirm-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-xl);
  max-width: 480px;
  text-align: center;
}

.confirm-card img {
  margin-bottom: var(--space-lg);
}

.confirm-status {
  font-family: var(--font-sans);
}

.confirm-status__title {
  font-family: var(--font-sans);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--space-md) 0;
}

.confirm-status p {
  font-family: Georgia, 'Times New Roman', serif;
  color: var(--color-text);
  margin: 0 0 var(--space-md) 0;
  line-height: 1.6;
}

.confirm-status__error {
  color: var(--color-error);
  font-family: var(--font-sans);
}

.confirm-status__link {
  font-family: var(--font-sans);
  color: var(--color-link);
}

/* ==========================================================================
   PLEDGE PAGE
   Uses base form-engine.css styles - no breakpoint overrides needed
   ========================================================================== */

/* Pledge form intro text */
.page-pledge .form-intro {
  font-family: var(--font-serif);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

/* Tighter spacing for certification checkboxes */
.page-pledge .form-field-group:has(.checkbox-item),
.page-pledge .form-field:has(.checkbox-item) {
  margin-bottom: var(--space-sm);  /* 8px instead of 16px */
}

/* Pledge success state - uses existing part-header + section patterns */

/* Confirmation details - definition list styling */
.confirmation-details {
  margin: 0 0 var(--space-lg) 0;
}

.confirmation-details__row {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.confirmation-details__row:last-child {
  border-bottom: none;
}

.confirmation-details dt {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  min-width: 80px;
  flex-shrink: 0;
}

.confirmation-details dd {
  margin: 0;
}

.confirmation-intro {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-lg);
}

.confirmation-note {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

/* Pledge page: checkboxes are primary content, not indented below labels */
.page-pledge .form-field-group > .checkbox-item,
.page-pledge .form-field > .checkbox-item {
  margin-left: 0;
}

/* Submit button aligns with form fields */
.page-pledge .form-nav .btn {
  margin-left: 0;
}