/* ═══════════════════════════════════════════════════════════════════════════
   rdx-design-system.css — ReasonDx Unified Design System
   Single source of truth for all visual decisions.
   Import this in every page: <link rel="stylesheet" href="/css/rdx-design-system.css">
   ═══════════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500;9..40,600;9..40,700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─────────────────────────────────────────────────────────────────────────────
   1. DESIGN TOKENS
   ───────────────────────────────────────────────────────────────────────────── */
:root {

  /* Brand — Ocean Blue palette */
  --rdx-ocean-deep:   #0d2b3e;   /* nav chrome, hero backgrounds */
  --rdx-ocean-dark:   #1a5276;   /* section headers, dark surfaces */
  --rdx-ocean:        #2874A6;   /* primary action color, links */
  --rdx-ocean-mid:    #85c1e9;   /* accent on dark backgrounds */
  --rdx-ocean-light:  #d6eaf8;   /* tints, selected states */
  --rdx-ocean-ghost:  rgba(40,116,166,0.08); /* hover backgrounds */

  /* Accent — Amber/Orange for rewards, CTAs, highlights */
  --rdx-accent:       #e67e22;
  --rdx-accent-dark:  #d35400;
  --rdx-accent-light: #fef0e0;

  /* Semantic */
  --rdx-success:      #1e8449;
  --rdx-success-bg:   #d5f5e3;
  --rdx-warning:      #9a7d0a;
  --rdx-warning-bg:   #fef9e7;
  --rdx-danger:       #c0392b;
  --rdx-danger-bg:    #fadbd8;
  --rdx-info:         #148f77;
  --rdx-info-bg:      #d1f2eb;

  /* Neutrals */
  --rdx-bg:           #f0f4f8;   /* page background */
  --rdx-surface:      #ffffff;   /* card/panel backgrounds */
  --rdx-surface-2:    #f8fafc;   /* subtle secondary surfaces */
  --rdx-border:       #dde4ec;   /* default borders */
  --rdx-border-hi:    #c5cdd8;   /* stronger borders */

  /* Text */
  --rdx-text:         #1a2332;   /* primary text */
  --rdx-text-secondary: #3d4f61; /* secondary labels */
  --rdx-text-muted:   #5d6d7e;   /* supporting text */
  --rdx-text-dim:     #8fa0b0;   /* placeholders, disabled */

  /* Typography */
  --rdx-font-serif:   'DM Serif Display', Georgia, serif;
  --rdx-font-sans:    'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --rdx-font-mono:    'JetBrains Mono', 'Menlo', 'Consolas', monospace;

  /* Spacing scale (8pt grid) */
  --rdx-space-1:  4px;
  --rdx-space-2:  8px;
  --rdx-space-3:  12px;
  --rdx-space-4:  16px;
  --rdx-space-5:  20px;
  --rdx-space-6:  24px;
  --rdx-space-8:  32px;
  --rdx-space-10: 40px;
  --rdx-space-12: 48px;
  --rdx-space-16: 64px;

  /* Radius */
  --rdx-radius-sm:  6px;
  --rdx-radius:     10px;
  --rdx-radius-md:  12px;
  --rdx-radius-lg:  16px;
  --rdx-radius-pill: 999px;

  /* Shadows */
  --rdx-shadow-sm:  0 1px 4px rgba(40,116,166,0.08);
  --rdx-shadow:     0 2px 16px rgba(40,116,166,0.10);
  --rdx-shadow-md:  0 4px 24px rgba(40,116,166,0.13);
  --rdx-shadow-lg:  0 8px 40px rgba(40,116,166,0.16);

  /* Nav */
  --rdx-nav-height: 58px;
  --rdx-nav-bg:     var(--rdx-ocean-deep);

  /* Transitions */
  --rdx-transition: 0.18s ease;
}

/* Dark theme */
[data-theme="dark"] {
  --rdx-bg:            #0a1628;
  --rdx-surface:       #0f2034;
  --rdx-surface-2:     #162844;
  --rdx-border:        #1e3a55;
  --rdx-border-hi:     #2a4f70;
  --rdx-text:          #e8f0f8;
  --rdx-text-secondary:#a8c4dc;
  --rdx-text-muted:    #6b92b0;
  --rdx-text-dim:      #3d5a78;
  --rdx-ocean-ghost:   rgba(40,116,166,0.15);
  --rdx-shadow:        0 2px 16px rgba(0,0,0,0.3);
  --rdx-shadow-md:     0 4px 24px rgba(0,0,0,0.4);
}


/* ─────────────────────────────────────────────────────────────────────────────
   2. RESETS & BASE
   ───────────────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--rdx-font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--rdx-text);
  background: var(--rdx-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: var(--rdx-nav-height);
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--rdx-ocean); }

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

button, input, select, textarea {
  font-family: var(--rdx-font-sans);
  font-size: inherit;
}

:focus-visible {
  outline: 2px solid var(--rdx-ocean);
  outline-offset: 2px;
  border-radius: var(--rdx-radius-sm);
}
:focus:not(:focus-visible) { outline: none; }


/* ─────────────────────────────────────────────────────────────────────────────
   3. TYPOGRAPHY
   ───────────────────────────────────────────────────────────────────────────── */

/* Display headings — always DM Serif Display */
.rdx-display-xl {
  font-family: var(--rdx-font-serif);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--rdx-text);
}
.rdx-display {
  font-family: var(--rdx-font-serif);
  font-size: clamp(1.7rem, 3.5vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--rdx-text);
}
.rdx-display-sm {
  font-family: var(--rdx-font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  line-height: 1.2;
  color: var(--rdx-text);
}

/* Section headings — DM Sans */
h1, .rdx-h1 { font-family: var(--rdx-font-serif); font-size: 2rem; font-weight: 400; line-height: 1.2; }
h2, .rdx-h2 { font-family: var(--rdx-font-sans);  font-size: 1.35rem; font-weight: 700; line-height: 1.3; }
h3, .rdx-h3 { font-family: var(--rdx-font-sans);  font-size: 1.05rem; font-weight: 600; line-height: 1.4; }
h4, .rdx-h4 { font-family: var(--rdx-font-sans);  font-size: 0.9rem;  font-weight: 700; line-height: 1.4; letter-spacing: 0.01em; }

/* Labels */
.rdx-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--rdx-ocean);
}
.rdx-label-muted {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--rdx-text-muted);
}

/* Body */
.rdx-body-lg { font-size: 1rem;   line-height: 1.7; }
.rdx-body    { font-size: 0.9rem; line-height: 1.65; }
.rdx-body-sm { font-size: 0.82rem; line-height: 1.55; }
.rdx-caption { font-size: 0.72rem; line-height: 1.45; color: var(--rdx-text-muted); }

/* Mono */
.rdx-mono {
  font-family: var(--rdx-font-mono);
  font-size: 0.85rem;
  background: var(--rdx-surface-2);
  border: 1px solid var(--rdx-border);
  padding: 1px 6px;
  border-radius: 4px;
}

/* Accent text */
.rdx-text-ocean  { color: var(--rdx-ocean); }
.rdx-text-accent { color: var(--rdx-accent); }
.rdx-text-muted  { color: var(--rdx-text-muted); }
.rdx-text-success { color: var(--rdx-success); }
.rdx-text-danger  { color: var(--rdx-danger); }
.rdx-text-white   { color: #ffffff; }


/* ─────────────────────────────────────────────────────────────────────────────
   4. GLOBAL NAV — injected by nav-global.js
   ───────────────────────────────────────────────────────────────────────────── */
#rdx-global-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--rdx-nav-height);
  background: var(--rdx-ocean-deep);
  display: flex;
  align-items: center;
  padding: 0 var(--rdx-space-8);
  gap: var(--rdx-space-4);
  z-index: 200;
  font-family: var(--rdx-font-sans);
  border-bottom: 1px solid rgba(133,193,233,0.12);
}

#rdx-global-nav .rdx-logo {
  font-family: var(--rdx-font-serif);
  font-size: 1.25rem;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: 0.01em;
  flex-shrink: 0;
}
#rdx-global-nav .rdx-logo span { color: var(--rdx-ocean-mid); }

#rdx-global-nav .rdx-nav-links {
  display: flex;
  align-items: center;
  gap: var(--rdx-space-1);
  margin-left: auto;
}

#rdx-global-nav .rdx-nav-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.65);
  padding: 6px 12px;
  border-radius: var(--rdx-radius-sm);
  text-decoration: none;
  transition: all var(--rdx-transition);
  white-space: nowrap;
}
#rdx-global-nav .rdx-nav-link:hover {
  color: #ffffff;
  background: rgba(255,255,255,0.1);
}
#rdx-global-nav .rdx-nav-link.active {
  color: var(--rdx-ocean-mid);
  background: rgba(133,193,233,0.12);
}

/* Nav dropdown */
#rdx-global-nav .rdx-nav-dropdown { position: relative; display: inline-block; }
#rdx-global-nav .rdx-nav-dropdown-btn {
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.65);
  padding: 6px 12px;
  border-radius: var(--rdx-radius-sm);
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--rdx-font-sans);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all var(--rdx-transition);
}
#rdx-global-nav .rdx-nav-dropdown-btn:hover {
  color: #ffffff;
  background: rgba(255,255,255,0.1);
}
#rdx-global-nav .rdx-nav-dropdown-btn::after {
  content: '▾';
  font-size: 9px;
  opacity: 0.6;
}

#rdx-global-nav .rdx-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--rdx-surface);
  border: 1.5px solid var(--rdx-border);
  border-radius: var(--rdx-radius-md);
  box-shadow: var(--rdx-shadow-lg);
  min-width: 220px;
  padding: var(--rdx-space-2);
  display: none;
  z-index: 300;
}
#rdx-global-nav .rdx-nav-dropdown:hover .rdx-dropdown-menu { display: block; }

#rdx-global-nav .rdx-dropdown-item {
  display: flex;
  flex-direction: column;
  padding: 9px 12px;
  border-radius: var(--rdx-radius);
  text-decoration: none;
  transition: background var(--rdx-transition);
  gap: 2px;
}
#rdx-global-nav .rdx-dropdown-item:hover { background: var(--rdx-surface-2); }
#rdx-global-nav .rdx-dropdown-item-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--rdx-text);
}
#rdx-global-nav .rdx-dropdown-item-sub {
  font-size: 0.72rem;
  color: var(--rdx-text-muted);
}
#rdx-global-nav .rdx-dropdown-divider {
  height: 1px;
  background: var(--rdx-border);
  margin: var(--rdx-space-1) 0;
}

/* Nav right buttons */
#rdx-global-nav .rdx-nav-btn {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--rdx-radius-pill);
  border: none;
  cursor: pointer;
  font-family: var(--rdx-font-sans);
  transition: all var(--rdx-transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
#rdx-global-nav .rdx-nav-btn-ghost {
  background: rgba(133,193,233,0.12);
  border: 1px solid rgba(133,193,233,0.25);
  color: rgba(255,255,255,0.8);
}
#rdx-global-nav .rdx-nav-btn-ghost:hover {
  background: rgba(133,193,233,0.22);
  color: #ffffff;
}
#rdx-global-nav .rdx-nav-btn-primary {
  background: var(--rdx-ocean);
  color: #ffffff;
}
#rdx-global-nav .rdx-nav-btn-primary:hover { background: var(--rdx-ocean-dark); }


/* ─────────────────────────────────────────────────────────────────────────────
   5. LAYOUT UTILITIES
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 var(--rdx-space-6);
}
.rdx-container-sm {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--rdx-space-6);
}
.rdx-container-lg {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--rdx-space-6);
}

.rdx-section { padding: var(--rdx-space-12) 0; }
.rdx-section-sm { padding: var(--rdx-space-8) 0; }

.rdx-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--rdx-space-6); }
.rdx-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--rdx-space-5); }
.rdx-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--rdx-space-4); }
.rdx-grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--rdx-space-5); }

.rdx-flex { display: flex; align-items: center; }
.rdx-flex-between { display: flex; align-items: center; justify-content: space-between; }
.rdx-flex-center { display: flex; align-items: center; justify-content: center; }
.rdx-flex-col { display: flex; flex-direction: column; }
.rdx-gap-2 { gap: var(--rdx-space-2); }
.rdx-gap-3 { gap: var(--rdx-space-3); }
.rdx-gap-4 { gap: var(--rdx-space-4); }
.rdx-gap-6 { gap: var(--rdx-space-6); }

.rdx-stack > * + * { margin-top: var(--rdx-space-4); }
.rdx-stack-sm > * + * { margin-top: var(--rdx-space-2); }
.rdx-stack-lg > * + * { margin-top: var(--rdx-space-8); }


/* ─────────────────────────────────────────────────────────────────────────────
   6. CARDS
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-card {
  background: var(--rdx-surface);
  border-radius: var(--rdx-radius-md);
  box-shadow: var(--rdx-shadow);
  overflow: hidden;
  border: 1.5px solid transparent;
  transition: transform var(--rdx-transition), box-shadow var(--rdx-transition), border-color var(--rdx-transition);
}
.rdx-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--rdx-shadow-md);
  border-color: var(--rdx-ocean-light);
}
.rdx-card-body { padding: var(--rdx-space-6); }
.rdx-card-body-sm { padding: var(--rdx-space-4); }

/* Dark header card variant */
.rdx-card-dark-header > :first-child {
  background: linear-gradient(135deg, var(--rdx-ocean-dark), var(--rdx-ocean));
  padding: var(--rdx-space-5) var(--rdx-space-6);
  color: #ffffff;
}

/* Featured/highlighted card */
.rdx-card-featured {
  background: linear-gradient(135deg, var(--rdx-ocean-dark), var(--rdx-ocean));
  color: #ffffff;
  border: none;
}
.rdx-card-featured:hover {
  transform: translateY(-2px);
  border-color: transparent;
}


/* ─────────────────────────────────────────────────────────────────────────────
   7. BUTTONS
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--rdx-space-2);
  padding: 10px 22px;
  border-radius: var(--rdx-radius);
  font-family: var(--rdx-font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--rdx-transition);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}
.rdx-btn-sm { padding: 7px 14px; font-size: 0.78rem; }
.rdx-btn-lg { padding: 13px 30px; font-size: 1rem; }

.rdx-btn-primary { background: var(--rdx-ocean); color: #ffffff; }
.rdx-btn-primary:hover { background: var(--rdx-ocean-dark); transform: translateY(-1px); color: #ffffff; }

.rdx-btn-accent { background: var(--rdx-accent); color: #ffffff; }
.rdx-btn-accent:hover { background: var(--rdx-accent-dark); transform: translateY(-1px); color: #ffffff; }

.rdx-btn-ghost {
  background: transparent;
  color: var(--rdx-text);
  border: 1.5px solid var(--rdx-border-hi);
}
.rdx-btn-ghost:hover { border-color: var(--rdx-ocean); color: var(--rdx-ocean); background: var(--rdx-ocean-ghost); }

.rdx-btn-ghost-white {
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.88);
  border: 1.5px solid rgba(255,255,255,0.25);
}
.rdx-btn-ghost-white:hover { background: rgba(255,255,255,0.18); color: #ffffff; }

.rdx-btn-success { background: var(--rdx-success); color: #ffffff; }
.rdx-btn-success:hover { background: #166534; }

.rdx-btn:disabled { opacity: 0.45; pointer-events: none; }


/* ─────────────────────────────────────────────────────────────────────────────
   8. BADGES & PILLS
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--rdx-radius-pill);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1;
}
.rdx-badge-ocean   { background: var(--rdx-ocean-light);  color: var(--rdx-ocean-dark); }
.rdx-badge-accent  { background: var(--rdx-accent-light); color: var(--rdx-accent-dark); }
.rdx-badge-success { background: var(--rdx-success-bg);   color: var(--rdx-success); }
.rdx-badge-danger  { background: var(--rdx-danger-bg);    color: var(--rdx-danger); }
.rdx-badge-warning { background: var(--rdx-warning-bg);   color: var(--rdx-warning); }
.rdx-badge-info    { background: var(--rdx-info-bg);      color: var(--rdx-info); }
.rdx-badge-dark    { background: rgba(255,255,255,0.15);  color: rgba(255,255,255,0.9); border: 1px solid rgba(255,255,255,0.2); }

/* XP pill — special reward styling */
.rdx-xp-pill {
  background: linear-gradient(135deg, var(--rdx-accent), #f39c12);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--rdx-radius-pill);
  letter-spacing: 0.05em;
}

/* Difficulty badges */
.rdx-diff-intro    { background: var(--rdx-info-bg);    color: var(--rdx-info); font-weight: 700; font-size: 0.68rem; padding: 2px 8px; border-radius: var(--rdx-radius-pill); }
.rdx-diff-inter    { background: var(--rdx-warning-bg); color: var(--rdx-warning); font-weight: 700; font-size: 0.68rem; padding: 2px 8px; border-radius: var(--rdx-radius-pill); }
.rdx-diff-advanced { background: var(--rdx-danger-bg);  color: var(--rdx-danger); font-weight: 700; font-size: 0.68rem; padding: 2px 8px; border-radius: var(--rdx-radius-pill); }


/* ─────────────────────────────────────────────────────────────────────────────
   9. HERO SECTIONS
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-hero {
  background: linear-gradient(145deg, var(--rdx-ocean-deep) 0%, var(--rdx-ocean-dark) 55%, #1f618d 100%);
  padding: var(--rdx-space-16) var(--rdx-space-8) 0;
  position: relative;
  overflow: hidden;
}
.rdx-hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 80% 50%, rgba(133,193,233,0.08) 0%, transparent 65%);
  pointer-events: none;
}
.rdx-hero-inner {
  max-width: 1040px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.rdx-hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(133,193,233,0.15);
  border: 1px solid rgba(133,193,233,0.3);
  color: var(--rdx-ocean-mid);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: var(--rdx-radius-pill);
  margin-bottom: var(--rdx-space-4);
}
.rdx-hero-title {
  font-family: var(--rdx-font-serif);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  color: #ffffff;
  line-height: 1.12;
  margin-bottom: var(--rdx-space-4);
}
.rdx-hero-title em { font-style: italic; color: var(--rdx-ocean-mid); }
.rdx-hero-sub {
  color: rgba(255,255,255,0.68);
  font-size: 1rem;
  line-height: 1.65;
  max-width: 560px;
  margin-bottom: var(--rdx-space-8);
}
.rdx-hero-wave {
  display: block; width: 100%;
  margin-top: var(--rdx-space-10);
}


/* ─────────────────────────────────────────────────────────────────────────────
   10. SECTION HEADERS (dark band)
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-section-header {
  background: linear-gradient(90deg, var(--rdx-ocean-dark), var(--rdx-ocean));
  color: #ffffff;
  padding: 10px 20px;
  border-radius: var(--rdx-radius) var(--rdx-radius) 0 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}


/* ─────────────────────────────────────────────────────────────────────────────
   11. PROGRESS & GAMIFICATION
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-progress-track {
  height: 6px;
  background: var(--rdx-ocean-light);
  border-radius: 3px;
  overflow: hidden;
}
.rdx-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--rdx-ocean), var(--rdx-ocean-mid));
  border-radius: 3px;
  transition: width 0.5s ease;
}

.rdx-step-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--rdx-ocean-light);
  transition: background var(--rdx-transition);
}
.rdx-step-dot.active { background: var(--rdx-accent); }
.rdx-step-dot.done   { background: var(--rdx-ocean); }


/* ─────────────────────────────────────────────────────────────────────────────
   12. CLINICAL REASONING — Answer Buttons
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-answer-btn {
  width: 100%;
  background: var(--rdx-surface-2);
  border: 1.5px solid var(--rdx-border);
  border-radius: var(--rdx-radius);
  padding: 13px 18px;
  font-family: var(--rdx-font-sans);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--rdx-text);
  cursor: pointer;
  text-align: left;
  transition: all var(--rdx-transition);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  line-height: 1.45;
}
.rdx-answer-btn:hover:not(:disabled) {
  border-color: var(--rdx-ocean);
  background: var(--rdx-ocean-light);
  transform: translateX(3px);
}
.rdx-answer-btn.correct {
  background: var(--rdx-success-bg);
  border-color: var(--rdx-success);
  color: var(--rdx-success);
  font-weight: 500;
}
.rdx-answer-btn.wrong {
  background: var(--rdx-danger-bg);
  border-color: var(--rdx-danger);
  color: var(--rdx-danger);
  font-weight: 500;
}
.rdx-answer-btn.dimmed { opacity: 0.4; pointer-events: none; }
.rdx-answer-btn:disabled { cursor: default; }

.rdx-choice-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px; min-width: 22px;
  background: #ffffff;
  border: 1.5px solid var(--rdx-border-hi);
  border-radius: 50%;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--rdx-text-muted);
  margin-top: 1px;
  flex-shrink: 0;
}
.rdx-answer-btn.correct .rdx-choice-letter { background: var(--rdx-success); border-color: var(--rdx-success); color: #ffffff; }
.rdx-answer-btn.wrong   .rdx-choice-letter { background: var(--rdx-danger);  border-color: var(--rdx-danger);  color: #ffffff; }


/* ─────────────────────────────────────────────────────────────────────────────
   13. FEEDBACK BOXES
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-feedback {
  border-radius: var(--rdx-radius);
  padding: var(--rdx-space-4) var(--rdx-space-5);
  margin-top: var(--rdx-space-3);
  display: none;
  animation: rdxFadeUp 0.3s ease;
}
.rdx-feedback.show { display: block; }
.rdx-feedback.correct { background: var(--rdx-success-bg); border: 1px solid #a9dfbf; }
.rdx-feedback.wrong   { background: var(--rdx-danger-bg);  border: 1px solid #f1948a; }

.rdx-feedback-title { font-weight: 700; font-size: 0.88rem; margin-bottom: 6px; }
.rdx-feedback.correct .rdx-feedback-title { color: var(--rdx-success); }
.rdx-feedback.wrong   .rdx-feedback-title { color: var(--rdx-danger); }
.rdx-feedback-text { font-size: 0.87rem; line-height: 1.6; }

.rdx-pearls { margin-top: 10px; padding-top: 10px; border-top: 1px solid rgba(0,0,0,0.07); }
.rdx-pearls-label { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--rdx-ocean); margin-bottom: 6px; }
.rdx-pearl { display: flex; gap: 8px; font-size: 0.84rem; line-height: 1.5; margin-bottom: 4px; }
.rdx-pearl::before { content: "◆"; color: var(--rdx-ocean); font-size: 0.58rem; margin-top: 4px; flex-shrink: 0; }


/* ─────────────────────────────────────────────────────────────────────────────
   14. PATIENT VIGNETTE
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-vignette {
  background: var(--rdx-surface-2);
  border-left: 3px solid var(--rdx-ocean);
  border-radius: 0 var(--rdx-radius) var(--rdx-radius) 0;
  padding: 14px 18px;
  font-size: 0.92rem;
  line-height: 1.7;
}
.rdx-vignette .highlight { color: var(--rdx-ocean-dark); font-weight: 600; }
.rdx-vignette .flag      { color: var(--rdx-danger); font-weight: 600; }
.rdx-vignette .pearl     { color: var(--rdx-info); font-weight: 600; }

.rdx-patient-stat {
  background: var(--rdx-surface-2);
  border-radius: var(--rdx-radius);
  padding: 10px 14px;
}
.rdx-patient-stat-label {
  font-size: 0.68rem;
  color: var(--rdx-text-muted);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 3px;
}
.rdx-patient-stat-value { font-size: 0.95rem; font-weight: 600; }


/* ─────────────────────────────────────────────────────────────────────────────
   15. TABLES
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.rdx-table th {
  background: var(--rdx-ocean-dark);
  color: #ffffff;
  padding: 10px 14px;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.rdx-table td { padding: 10px 14px; border-bottom: 1px solid var(--rdx-border); }
.rdx-table tr:last-child td { border-bottom: none; }
.rdx-table tr:nth-child(even) td { background: var(--rdx-surface-2); }
.rdx-table tr:hover td { background: var(--rdx-ocean-ghost); }


/* ─────────────────────────────────────────────────────────────────────────────
   16. FORMS & INPUTS
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-input {
  width: 100%;
  background: var(--rdx-surface);
  border: 1.5px solid var(--rdx-border);
  border-radius: var(--rdx-radius);
  padding: 10px 14px;
  font-family: var(--rdx-font-sans);
  font-size: 0.9rem;
  color: var(--rdx-text);
  transition: border-color var(--rdx-transition), box-shadow var(--rdx-transition);
}
.rdx-input:focus {
  border-color: var(--rdx-ocean);
  box-shadow: 0 0 0 3px rgba(40,116,166,0.1);
  outline: none;
}
.rdx-input::placeholder { color: var(--rdx-text-dim); }

.rdx-search {
  display: flex;
  background: var(--rdx-surface);
  border: 1.5px solid var(--rdx-border-hi);
  border-radius: var(--rdx-radius);
  overflow: hidden;
  box-shadow: var(--rdx-shadow-sm);
  transition: all var(--rdx-transition);
}
.rdx-search:focus-within { border-color: var(--rdx-ocean); box-shadow: 0 0 0 3px rgba(40,116,166,0.08); }
.rdx-search input { flex: 1; border: none; background: transparent; outline: none; padding: 12px 16px; font-family: var(--rdx-font-sans); font-size: 0.9rem; color: var(--rdx-text); }


/* ─────────────────────────────────────────────────────────────────────────────
   17. ANALYTICS & DASHBOARDS
   ───────────────────────────────────────────────────────────────────────────── */
.rdx-stat-card {
  background: var(--rdx-surface);
  border-radius: var(--rdx-radius-md);
  padding: var(--rdx-space-5) var(--rdx-space-6);
  box-shadow: var(--rdx-shadow);
  text-align: center;
}
.rdx-stat-value {
  font-family: var(--rdx-font-serif);
  font-size: 2rem;
  color: var(--rdx-ocean-dark);
  line-height: 1;
  margin-bottom: 4px;
}
.rdx-stat-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--rdx-text-muted);
}


/* ─────────────────────────────────────────────────────────────────────────────
   18. ANIMATIONS
   ───────────────────────────────────────────────────────────────────────────── */
@keyframes rdxFadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes rdxFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes rdxSlideIn {
  from { transform: translateX(-12px); opacity: 0; }
  to   { transform: translateX(0);     opacity: 1; }
}

.rdx-animate-up { animation: rdxFadeUp 0.4s ease both; }
.rdx-animate-in { animation: rdxFadeIn 0.3s ease both; }

/* Staggered children */
.rdx-stagger > *:nth-child(1) { animation-delay: 0.00s; }
.rdx-stagger > *:nth-child(2) { animation-delay: 0.05s; }
.rdx-stagger > *:nth-child(3) { animation-delay: 0.10s; }
.rdx-stagger > *:nth-child(4) { animation-delay: 0.15s; }
.rdx-stagger > *:nth-child(5) { animation-delay: 0.20s; }
.rdx-stagger > *:nth-child(6) { animation-delay: 0.25s; }


/* ─────────────────────────────────────────────────────────────────────────────
   19. RESPONSIVE
   ───────────────────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .rdx-grid-2, .rdx-grid-3, .rdx-grid-4 { grid-template-columns: 1fr; }
  .rdx-container, .rdx-container-sm, .rdx-container-lg { padding: 0 var(--rdx-space-4); }
  .rdx-hero { padding: var(--rdx-space-10) var(--rdx-space-5) 0; }
  #rdx-global-nav { padding: 0 var(--rdx-space-4); }
  #rdx-global-nav .rdx-nav-link { display: none; }
}
@media (max-width: 480px) {
  .rdx-grid-auto { grid-template-columns: 1fr; }
}


/* ─────────────────────────────────────────────────────────────────────────────
   20. PRINT
   ───────────────────────────────────────────────────────────────────────────── */
@media print {
  #rdx-global-nav, .rdx-btn, .rdx-progress-track { display: none !important; }
  body { background: #fff !important; color: #000 !important; padding-top: 0; }
  .rdx-card { box-shadow: none !important; border: 1px solid #ccc !important; }
}