/* ============================================
   獣医論文まとめ - Design System v2
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;600;700;900&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Custom Properties --- */
:root {
  --color-bg-primary: #0f1923;
  --color-bg-secondary: #162233;
  --color-bg-card: #1a2a3e;
  --color-bg-card-hover: #1f3349;
  --color-bg-accordion: #142030;
  --color-bg-highlight: rgba(56, 189, 248, 0.08);

  --color-text-primary: #e8edf3;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-text-accent: #38bdf8;

  --color-border: rgba(148, 163, 184, 0.12);
  --color-border-accent: rgba(56, 189, 248, 0.3);
  --color-border-hover: rgba(56, 189, 248, 0.5);

  --color-accent-primary: #38bdf8;
  --color-accent-secondary: #22d3ee;
  --color-accent-tertiary: #a78bfa;
  --color-accent-success: #34d399;
  --color-accent-warning: #fbbf24;
  --color-accent-danger: #f87171;
  --color-accent-orange: #fb923c;

  --gradient-accent: linear-gradient(135deg, #38bdf8, #22d3ee);
  --gradient-card: linear-gradient(145deg, rgba(26, 42, 62, 0.9), rgba(22, 34, 51, 0.95));
  --gradient-header: linear-gradient(135deg, #0f1923 0%, #162233 50%, #1a2a3e 100%);
  --gradient-premium: linear-gradient(135deg, #f59e0b, #d97706);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.15);
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.03);

  --font-sans: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  --max-width: 900px;
  --header-height: 56px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 20%, rgba(56, 189, 248, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(34, 211, 238, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
}

h1 {
  font-size: 1.85rem;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.4rem;
  letter-spacing: -0.005em;
}

h3 {
  font-size: 1.15rem;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
}

/* --- Ruby (ルビ・略語注釈) --- */
.abbr-ruby {
  position: relative;
  font-weight: 600;
  cursor: help;
  border-bottom: 1px dotted var(--color-text-muted);
}

.abbr-ruby rt {
  font-size: 0.6em;
  color: var(--color-accent-primary);
  font-weight: 400;
}

/* Tooltip for abbreviation on hover */
.abbr-explain {
  position: relative;
  display: inline;
  cursor: help;
  border-bottom: 1px dotted var(--color-text-muted);
}

.abbr-explain::after {
  content: attr(data-explain);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 400;
  white-space: nowrap;
  border: 1px solid var(--color-border-accent);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.abbr-explain:hover::after {
  opacity: 1;
}

/* --- Mobile Navigation --- */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(15, 25, 35, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  padding: 0 var(--space-md);
  align-items: center;
  justify-content: space-between;
}

.mobile-nav .nav-brand {
  font-size: 1rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hamburger-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.hamburger-btn:hover {
  background: var(--color-bg-highlight);
}

.hamburger-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: all var(--transition-base);
}

.hamburger-btn.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.open span:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Slide-out Menu */
.slide-menu {
  position: fixed;
  top: var(--header-height);
  right: -300px;
  width: 280px;
  height: calc(100vh - var(--header-height));
  background: rgba(15, 25, 35, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-left: 1px solid var(--color-border);
  z-index: 999;
  transition: right var(--transition-base);
  overflow-y: auto;
  padding: var(--space-lg);
}

.slide-menu.open {
  right: 0;
}

.slide-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.slide-menu-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.slide-menu h4 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  margin-top: var(--space-lg);
}

.slide-menu h4:first-child {
  margin-top: 0;
}

.slide-menu a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.slide-menu a:hover {
  background: var(--color-bg-highlight);
  color: var(--color-accent-primary);
  text-decoration: none;
}

/* --- Page Container --- */
.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

/* --- Header --- */
.page-header {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-2xl);
}

.page-header .category-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 50px;
  margin-bottom: var(--space-md);
}

.page-header h1 {
  margin-bottom: var(--space-sm);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-header .subtitle {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Meta */
.meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-lg);
  padding: var(--space-md) 0;
  margin-top: var(--space-md);
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.meta-item .icon {
  font-size: 1rem;
}

.meta-item strong {
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* --- Cards --- */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  transform: translateY(-1px);
}

.card+.card {
  margin-top: var(--space-lg);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.card-header .card-icon {
  font-size: 1.3rem;
}

.card-header h2,
.card-header h3 {
  font-size: 1.05rem;
  font-weight: 600;
}

/* --- Accordion --- */
.accordion {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--space-md) 0;
  background: var(--color-bg-accordion);
}

.accordion+.accordion {
  margin-top: var(--space-sm);
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  gap: var(--space-md);
}

.accordion-trigger:hover {
  background: var(--color-bg-highlight);
  color: var(--color-accent-primary);
}

.accordion-trigger .trigger-left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.accordion-trigger .trigger-icon {
  font-size: 1.1rem;
}

.accordion-trigger .chevron {
  font-size: 0.75rem;
  transition: transform var(--transition-base);
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.accordion.open .accordion-trigger .chevron {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.accordion.open .accordion-content {
  max-height: 5000px;
}

.accordion-body {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.accordion-body p+p {
  margin-top: var(--space-md);
}

.accordion-body ul,
.accordion-body ol {
  margin-top: var(--space-md);
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.accordion-body li {
  margin-bottom: var(--space-md);
  line-height: 1.75;
}

.accordion-body>h4 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  color: var(--color-accent-primary);
  font-size: 1.05rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 4px;
}

/* --- Tags --- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 50px;
  background: rgba(148, 163, 184, 0.1);
  color: var(--color-text-secondary);
  border: 1px solid rgba(148, 163, 184, 0.15);
  transition: all var(--transition-fast);
}

.tag:hover {
  background: rgba(56, 189, 248, 0.1);
  color: var(--color-accent-primary);
  border-color: rgba(56, 189, 248, 0.2);
}

a.tag {
  text-decoration: none;
}

a.tag:hover {
  text-decoration: none;
}

.tag--primary {
  background: rgba(56, 189, 248, 0.12);
  color: var(--color-accent-primary);
  border-color: rgba(56, 189, 248, 0.2);
}

.tag--success {
  background: rgba(52, 211, 153, 0.12);
  color: var(--color-accent-success);
  border-color: rgba(52, 211, 153, 0.2);
}

.tag--warning {
  background: rgba(251, 191, 36, 0.12);
  color: var(--color-accent-warning);
  border-color: rgba(251, 191, 36, 0.2);
}

.tag--danger {
  background: rgba(248, 113, 113, 0.12);
  color: var(--color-accent-danger);
  border-color: rgba(248, 113, 113, 0.2);
}

/* --- Evidence Level --- */
.evidence-level {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
}

.evidence-level--high {
  background: rgba(52, 211, 153, 0.15);
  color: var(--color-accent-success);
  border: 1px solid rgba(52, 211, 153, 0.25);
}

.evidence-level--moderate {
  background: rgba(251, 191, 36, 0.15);
  color: var(--color-accent-warning);
  border: 1px solid rgba(251, 191, 36, 0.25);
}

.evidence-level--low {
  background: rgba(248, 113, 113, 0.15);
  color: var(--color-accent-danger);
  border: 1px solid rgba(248, 113, 113, 0.25);
}

/* --- Key Findings Box --- */
.key-findings {
  background: rgba(56, 189, 248, 0.06);
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-left: 3px solid var(--color-accent-primary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.key-findings h4 {
  color: var(--color-accent-primary);
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.key-findings ul {
  list-style: none;
  padding: 0;
}

.key-findings li {
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
  font-size: 0.9rem;
}

.key-findings li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-accent-primary);
  font-weight: 700;
}

/* --- Clinical Tip --- */
.clinical-tip {
  background: rgba(52, 211, 153, 0.06);
  border: 1px solid rgba(52, 211, 153, 0.15);
  border-left: 3px solid var(--color-accent-success);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.clinical-tip h4 {
  color: var(--color-accent-success);
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
}

.clinical-tip h4::before {
  content: '💡 ';
}

/* --- Owner Communication Tip --- */
.owner-tip {
  background: rgba(167, 139, 250, 0.06);
  border: 1px solid rgba(167, 139, 250, 0.15);
  border-left: 3px solid var(--color-accent-tertiary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.owner-tip h4 {
  color: var(--color-accent-tertiary);
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
}

.owner-tip h4::before {
  content: '🗣️ ';
}

.owner-tip .speech-bubble {
  background: rgba(167, 139, 250, 0.08);
  border: 1px solid rgba(167, 139, 250, 0.15);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-sm) 0;
  font-style: italic;
  font-size: 0.88rem;
  position: relative;
}

.owner-tip .speech-bubble::before {
  content: '💬';
  position: absolute;
  top: -10px;
  left: 12px;
  font-size: 0.9rem;
}

/* --- Warning Box --- */
.warning-box {
  background: rgba(251, 191, 36, 0.06);
  border: 1px solid rgba(251, 191, 36, 0.15);
  border-left: 3px solid var(--color-accent-warning);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.warning-box h4 {
  color: var(--color-accent-warning);
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
}

.warning-box h4::before {
  content: '⚠️ ';
}

/* --- Product Availability Badge --- */
.product-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 50px;
  vertical-align: middle;
  margin-left: 4px;
}

.product-badge--jp {
  background: rgba(52, 211, 153, 0.15);
  color: var(--color-accent-success);
  border: 1px solid rgba(52, 211, 153, 0.25);
}

.product-badge--overseas {
  background: rgba(251, 191, 36, 0.15);
  color: var(--color-accent-warning);
  border: 1px solid rgba(251, 191, 36, 0.25);
}

/* --- Comparison Table --- */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: 0.85rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  /* Prevent tables from expanding past container bounds when containing large SVG graphs */
  table-layout: fixed;
}

.comparison-table thead th {
  background: rgba(56, 189, 248, 0.1);
  color: var(--color-accent-primary);
  font-weight: 600;
  text-align: left;
  padding: var(--space-md);
  border-bottom: 2px solid var(--color-border-accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  /* Protect small columns from getting completely destroyed */
  word-wrap: break-word;
}

/* Ensure the first two columns (usually 'Category', 'Action') don't become micro-sized */
.comparison-table th:first-child,
.comparison-table th:nth-child(2) {
  width: 20%;
}

.comparison-table tbody td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  vertical-align: top;
  /* Ensure content wraps normally, and long unbroken strings break */
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.comparison-table tbody tr:hover td {
  background: var(--color-bg-highlight);
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

/* --- Paper List --- */
.paper-list {
  list-style: none;
  padding: 0;
}

.paper-list-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.paper-list-item:last-child {
  border-bottom: none;
}

.paper-list-item:hover {
  padding-left: var(--space-sm);
}

.paper-list-item .paper-number {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-accent);
  color: var(--color-bg-primary);
  font-weight: 700;
  font-size: 0.75rem;
  border-radius: 50%;
  margin-top: 2px;
}

.paper-list-item .paper-info h4 {
  font-size: 0.9rem;
  margin-bottom: 2px;
}

.paper-list-item .paper-info .paper-authors {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.paper-list-item .paper-info .paper-journal {
  font-size: 0.78rem;
  color: var(--color-accent-tertiary);
  font-style: italic;
}

/* --- Section Divider --- */
.section-divider {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-accent), transparent);
  margin: var(--space-2xl) 0;
}

/* --- Bottom Line / Summary --- */
.bottom-line {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(34, 211, 238, 0.06));
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin: var(--space-2xl) 0;
  position: relative;
  overflow: hidden;
}

.bottom-line::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

.bottom-line h3 {
  color: var(--color-accent-primary);
  margin-bottom: var(--space-md);
  font-size: 1rem;
}

.bottom-line p {
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ============================================
   Premium / Free Content Toggle System
   ============================================ */

/* Toggle Bar */
.content-mode-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: rgba(251, 191, 36, 0.06);
  border: 1px solid rgba(251, 191, 36, 0.15);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xl);
  font-size: 0.85rem;
}

.content-mode-bar label {
  color: var(--color-text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 500;
}

/* Custom Toggle Switch */
.toggle-switch {
  position: relative;
  width: 48px;
  height: 26px;
  display: inline-block;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 26px;
  transition: all var(--transition-base);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 20px;
  width: 20px;
  left: 2px;
  bottom: 2px;
  background: var(--color-text-secondary);
  border-radius: 50%;
  transition: all var(--transition-base);
}

.toggle-switch input:checked+.toggle-slider {
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.3), rgba(245, 158, 11, 0.3));
  border-color: rgba(251, 191, 36, 0.4);
}

.toggle-switch input:checked+.toggle-slider::before {
  transform: translateX(22px);
  background: var(--color-accent-warning);
}

/* Premium Content Styling */
.premium-content {
  position: relative;
  transition: all var(--transition-base);
}

/* FREE mode: premium content is hidden completely */
body.mode-free .premium-content {
  display: none;
}

/* Lock overlay for free mode — shown inside accordion below trigger */
.premium-lock {
  display: none;
  text-align: center;
  padding: var(--space-md);
  color: var(--color-accent-warning);
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px dashed rgba(251, 191, 36, 0.3);
  border-radius: var(--radius-sm);
  margin: var(--space-sm) var(--space-lg) var(--space-md);
  background: rgba(251, 191, 36, 0.04);
}

body.mode-free .premium-lock {
  display: block;
}

.premium-lock .lock-icon {
  font-size: 1.2rem;
  margin-bottom: 2px;
  display: block;
}

/* Free content always visible */

/* --- Section Divider --- */
.section-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-lg) 0 var(--space-md);
}

/* --- Table Responsive (Mobile scroll) --- */
@media (max-width: 600px) {
  .comparison-table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.78rem;
  }

  .comparison-table thead th,
  .comparison-table tbody td {
    padding: var(--space-sm) var(--space-xs);
    /* Allow text to wrap natively instead of forcing a horizontal scroll on text paragraphs */
    white-space: normal;
  }
}

/* --- Footer --- */
.page-footer {
  margin-top: var(--space-3xl);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

/* --- Navigation Cards --- */
.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

.nav-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-xl);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
}

.nav-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  transform: translateY(-3px);
  text-decoration: none;
}

.nav-card .nav-icon {
  font-size: 2rem;
  margin-bottom: var(--space-xs);
}

.nav-card h3 {
  font-size: 1rem;
  color: var(--color-text-primary);
}

.nav-card p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.nav-card .nav-count {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  margin-top: auto;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

/* --- Stats Bar --- */
.stats-bar {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-item .stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item .stat-label {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* --- Print --- */
@media print {
  body {
    background: white;
    color: #1a1a1a;
    font-size: 11pt;
  }

  body::before {
    display: none;
  }

  .page-container {
    max-width: 100%;
    padding: 0;
  }

  .card {
    background: white;
    border: 1px solid #ddd;
    box-shadow: none;
    break-inside: avoid;
  }

  .accordion-content {
    max-height: none !important;
  }

  .accordion-trigger .chevron {
    display: none;
  }

  h1 {
    background: none;
    -webkit-text-fill-color: #1a1a1a;
    color: #1a1a1a;
  }

  .key-findings,
  .clinical-tip,
  .warning-box,
  .bottom-line,
  .owner-tip {
    background: #f8f8f8;
    border-color: #ccc;
  }

  a {
    color: #1a1a1a;
    text-decoration: underline;
  }

  .nav-grid,
  .page-footer,
  .mobile-nav,
  .slide-menu,
  .slide-menu-overlay,
  .content-mode-bar {
    display: none !important;
  }

  .premium-content {
    max-height: none !important;
    filter: none !important;
    overflow: visible !important;
  }

  .premium-lock {
    display: none !important;
  }
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --max-width: 100%;
  }

  body {
    font-size: 14px;
    padding-top: var(--header-height);
  }

  .mobile-nav {
    display: flex;
  }

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

  h1 {
    font-size: 1.35rem;
  }

  h2 {
    font-size: 1.15rem;
  }

  .page-header {
    padding: var(--space-lg) 0 var(--space-md);
    margin-bottom: var(--space-lg);
  }

  .card {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

  .meta-bar {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .nav-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

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

  .stats-bar {
    justify-content: space-around;
  }

  .comparison-table {
    font-size: 0.75rem;
  }

  .comparison-table thead th,
  .comparison-table tbody td {
    padding: var(--space-sm);
  }

  .accordion-trigger {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.85rem;
  }

  .accordion-body {
    padding: 0 var(--space-md) var(--space-md);
    font-size: 0.85rem;
  }

  .key-findings,
  .clinical-tip,
  .warning-box,
  .owner-tip,
  .bottom-line {
    padding: var(--space-md);
  }

  .content-mode-bar {
    flex-wrap: wrap;
    font-size: 0.78rem;
    padding: var(--space-sm) var(--space-md);
  }

  /* Better touch targets on mobile */
  .accordion-trigger {
    min-height: 48px;
  }

  .tag {
    padding: 4px 12px;
    font-size: 0.7rem;
  }

  .paper-list-item {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .paper-list-item .paper-number {
    width: 24px;
    height: 24px;
    font-size: 0.7rem;
  }

  /* Abbreviation tooltip mobile-friendly */
  .abbr-explain::after {
    position: fixed;
    bottom: auto;
    top: auto;
    left: 50%;
    bottom: 20px;
    transform: translateX(-50%);
    max-width: 80vw;
    white-space: normal;
    text-align: center;
  }
}

/* Very small screens */
@media (max-width: 400px) {
  body {
    font-size: 13px;
  }

  h1 {
    font-size: 1.2rem;
  }

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

  .comparison-table {
    font-size: 0.7rem;
  }
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-glow {

  0%,
  100% {
    box-shadow: 0 0 5px rgba(56, 189, 248, 0.2);
  }

  50% {
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);
  }
}

.fade-in-up {
  animation: fadeInUp 0.5s ease-out both;
}

.card:nth-child(1) {
  animation-delay: 0.05s;
}

.card:nth-child(2) {
  animation-delay: 0.1s;
}

.card:nth-child(3) {
  animation-delay: 0.15s;
}

.card:nth-child(4) {
  animation-delay: 0.2s;
}

.card:nth-child(5) {
  animation-delay: 0.25s;
}

/* --- Back to Top Button --- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--color-border-accent);
  background: rgba(22, 34, 51, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--color-accent-primary);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background 0.2s ease, border-color 0.2s ease;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.2);
}

.back-to-top:active {
  transform: translateY(0);
}

@media (max-width: 768px) {
  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }
}

/* --- Breadcrumb / Back to Index --- */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  padding: var(--space-sm) 0;
  margin-bottom: var(--space-sm);
}

.breadcrumb-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.breadcrumb-nav a:hover {
  color: var(--color-accent-primary);
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.15);
}

.breadcrumb-nav a .back-arrow {
  font-size: 1rem;
  transition: transform var(--transition-fast);
}

.breadcrumb-nav a:hover .back-arrow {
  transform: translateX(-3px);
}

/* --- Mermaid Diagram Readability (Mobile & PC) --- */
.mermaid {
  overflow-x: auto;
  overflow-y: hidden;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  -webkit-overflow-scrolling: touch;
  margin: var(--space-xl) 0;
  padding: var(--space-md);
  background: rgba(15, 25, 35, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
}

/* SVG must fill its container width completely */
.mermaid svg {
  width: 100% !important;
  max-width: 100% !important;
  height: auto !important;
  display: block;
  margin: 0 auto;
}

/* Custom Scrollbar for Mermaid Container to hint horizontal scrollability */
.mermaid::-webkit-scrollbar {
  height: 8px;
}

.mermaid::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 4px;
}

.mermaid::-webkit-scrollbar-thumb {
  background: var(--color-border-accent);
  border-radius: 4px;
}

.mermaid::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-primary);
}

/* --- Mermaid Diagram Container (Wrapper) --- */
.mermaid-wrapper {
  width: 100%;
  max-width: 100%;
  overflow: visible;
  margin: 0 0 var(--space-md) 0;
  border-radius: var(--radius-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  box-sizing: border-box;
}

/* SVG inside wrapper must also fill width */
.mermaid-wrapper svg {
  width: 100% !important;
  max-width: 100% !important;
  height: auto !important;
  display: block;
  margin: 0 auto;
}

.mermaid-wrapper .mermaid {
  background: transparent;
  padding: 0;
  border: none;
  margin: 0;
  overflow: visible;
}

/* --- Hide content mode toggle (kept in HTML for future use) --- */
.content-mode-bar {
  display: none !important;
}

/* --- Collapsible Flowchart Toggle --- */
.flowchart-collapse {
  margin: var(--space-md) 0;
}

.flowchart-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(99, 102, 241, 0.12));
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-md);
  color: var(--color-accent-primary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.flowchart-toggle::-webkit-details-marker {
  display: none;
}

.flowchart-toggle:hover {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(99, 102, 241, 0.2));
  border-color: var(--color-accent-primary);
}

.flowchart-toggle:active {
  transform: scale(0.97);
}
/* ============================================
   Owner Tips Accordion - Purple Theme
   ============================================ */
#owner-tips > .accordion {
  border-color: rgba(168, 85, 247, 0.35);
  background: rgba(168, 85, 247, 0.04);
}
#owner-tips .accordion-trigger {
  border-left: 4px solid #a855f7;
  background: rgba(168, 85, 247, 0.06);
}
#owner-tips .accordion-trigger:hover {
  background: rgba(168, 85, 247, 0.12);
  color: #c084fc;
}
#owner-tips .trigger-left {
  color: #c084fc;
}
#owner-tips .accordion-body {
  border-top: 1px solid rgba(168, 85, 247, 0.15);
}

/* ============================================
   Mermaid Flowchart - Pro Mobile Readability Enhancements
   ============================================ */
/* Force extreme line thickness (12px) on connector arrows/lines */
.mermaid svg .edgePaths path,
.mermaid svg .edgePath path,
.mermaid svg .edgePaths line,
.mermaid svg .edgePath line {
  stroke-width: 12px !important;
}
/* Force thickness (8px) on all node shapes (rectangles, diamonds) */
.mermaid svg .nodes rect,
.mermaid svg .nodes circle,
.mermaid svg .nodes ellipse,
.mermaid svg .nodes polygon,
.mermaid svg .nodes path,
.mermaid svg .node rect,
.mermaid svg .node circle,
.mermaid svg .node ellipse,
.mermaid svg .node polygon,
.mermaid svg .node path {
  stroke-width: 8px !important;
}
/* Prevent the 5px stroke from destroying text readability */
.mermaid svg text,
.mermaid svg tspan,
.mermaid svg .edgeLabel {
  stroke-width: 0 !important;
}
/* Ensure arrows/branch labels remain bold and large */
.mermaid svg .edgeLabel {
  font-weight: 700 !important;
  font-size: 1.25em !important;
  color: var(--color-text-primary) !important;
  background-color: var(--color-bg-secondary) !important;
}
/* Make the text inside the nodes (rectangles, diamonds) bolder and larger */
.mermaid svg .node .label,
.mermaid svg .node text {
  font-weight: 700 !important;
  font-size: 1.15em !important;
}