/* ===================================================================
   WgetCloud — Frosted Slate & Controlled Luminescence
   Pure Vanilla HTML & Native CSS | Zero Heavy External Dependencies
   =================================================================== */

/* --- 1. Root & CSS Variables --- */
:root {
  /* Default: Daytime / Light Mode (Understated Frosted Slate Mineral) */
  --bg-page: #f6f8fa;
  --bg-subtle: #edf1f5;
  --bg-card: rgba(255, 255, 255, 0.78);
  --bg-card-hover: rgba(255, 255, 255, 0.92);
  --bg-glass-nav: rgba(246, 248, 250, 0.85);
  
  --border-card: rgba(13, 15, 18, 0.08);
  --border-card-hover: rgba(13, 15, 18, 0.18);
  --border-subtle: rgba(13, 15, 18, 0.06);

  --text-main: #0d0f12;
  --text-secondary: #57606e;
  --text-muted: #8c95a3;
  --text-inverse: #f5f6f8;

  --specular-light: rgba(13, 15, 18, 0.18);
  --specular-hover: rgba(13, 15, 18, 0.35);

  --btn-primary-bg: #0d0f12;
  --btn-primary-text: #f5f6f8;
  --btn-primary-hover: #23272e;
  
  --btn-secondary-bg: rgba(255, 255, 255, 0.85);
  --btn-secondary-text: #0d0f12;
  --btn-secondary-border: rgba(13, 15, 18, 0.12);

  --shadow-card: 0 4px 20px -2px rgba(13, 15, 18, 0.04), 0 2px 6px -1px rgba(13, 15, 18, 0.02);
  --shadow-lift: 0 10px 25px -4px rgba(13, 15, 18, 0.08), 0 4px 8px -2px rgba(13, 15, 18, 0.03);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --spring-curve: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --transition-theme: background-color 0.35s ease, border-color 0.35s ease, color 0.35s ease;
}

/* --- Dark Theme: Deep Obsidian Slate (#0D0F12) --- */
[data-theme="dark"] {
  --bg-page: #0d0f12;
  --bg-subtle: #12151a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.05);
  --bg-glass-nav: rgba(13, 15, 18, 0.82);

  --border-card: rgba(255, 255, 255, 0.06);
  --border-card-hover: rgba(255, 255, 255, 0.14);
  --border-subtle: rgba(255, 255, 255, 0.04);

  --text-main: #f5f6f8;
  --text-secondary: #8e95a2;
  --text-muted: #5e6573;
  --text-inverse: #0d0f12;

  --specular-light: rgba(255, 255, 255, 0.18);
  --specular-hover: rgba(255, 255, 255, 0.42);

  --btn-primary-bg: #f5f6f8;
  --btn-primary-text: #0d0f12;
  --btn-primary-hover: #e2e4e8;

  --btn-secondary-bg: rgba(255, 255, 255, 0.04);
  --btn-secondary-text: #f5f6f8;
  --btn-secondary-border: rgba(255, 255, 255, 0.08);

  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.4);
  --shadow-lift: 0 10px 30px -4px rgba(0, 0, 0, 0.6);
}

/* --- 2. Base Reset & Crisp Typography --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.65;
  transition: var(--transition-theme);
  overflow-x: hidden;
  position: relative;
}

/* Controlled Ambient Luminescence */
.ambient-glow-overhead {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%) translateY(var(--scroll-offset, 0px));
  width: 900px;
  height: 450px;
  background: radial-gradient(ellipse at 50% 0%, var(--specular-light) 0%, transparent 68%);
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
  transition: transform 0.1s linear;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 96px 0;
  position: relative;
  border-bottom: 1px solid var(--border-subtle);
}

/* --- 3. Interactive Cards: Specular Edge Highlight & Spring Lift --- */
.specular-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform 0.25s var(--spring-curve),
              background 0.25s ease,
              border-color 0.25s ease,
              box-shadow 0.25s ease;
}

/* Specular 1px beveled top edge reflection */
.specular-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: radial-gradient(160px circle at var(--mouse-x, 50%) 0px, var(--specular-hover), transparent 75%);
  pointer-events: none;
  opacity: 0.75;
  transition: opacity 0.2s ease;
  z-index: 2;
}

/* Elastic Spring Lift: elevates by exactly 2px on the Y-axis */
.specular-card:hover {
  transform: translateY(-2px);
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  box-shadow: var(--shadow-lift);
}

.specular-card:hover::before {
  opacity: 1;
}

/* --- 4. Navigation Bar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 74px;
  z-index: 1000;
  background: var(--bg-glass-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-theme);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.logo-symbol {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--text-main);
  color: var(--bg-page);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  padding: 6px 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--text-main);
}

/* Highlight for newly added recommended insights */
.nav-link-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--border-card-hover);
  color: var(--text-main);
  margin-left: 4px;
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Frosted Precision Theme Toggle Button */
.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
  transition: var(--transition-theme), transform 0.2s ease;
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  color: var(--text-main);
  transform: translateY(-1px);
}

.theme-icon-sun, .theme-icon-moon {
  position: absolute;
  width: 18px;
  height: 18px;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease;
}

:root .theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}
:root .theme-icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.4);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.4);
}
[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.mobile-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-main);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
}

/* --- 5. Clean Buttons System --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform 0.2s var(--spring-curve), background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
  min-height: 42px;
  letter-spacing: -0.01em;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border: 1px solid transparent;
}

.btn-primary:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-2px);
  color: var(--btn-primary-text);
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border: 1px solid var(--btn-secondary-border);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 13px 28px;
  font-size: 0.98rem;
  min-height: 48px;
}

.btn-full {
  width: 100%;
}

/* --- 6. Hero Section & Minimalist Slate Tiers --- */
.hero-section {
  padding-top: 155px;
  padding-bottom: 90px;
  text-align: center;
  position: relative;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.hero-tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-secondary);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 750;
  letter-spacing: -0.035em;
  line-height: 1.15;
  margin-bottom: 22px;
  color: var(--text-main);
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 44px;
  line-height: 1.7;
}

/* Centered Balanced 3 Slate Tier Cards */
.hero-tier-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  max-width: 1040px;
  margin: 0 auto 40px auto;
  text-align: left;
}

.hero-tier-card {
  padding: 26px 24px;
}

.hero-tier-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.hero-tier-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.hero-tier-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--border-subtle);
  color: var(--text-secondary);
}

.hero-tier-price {
  display: flex;
  align-items: baseline;
  gap: 3px;
  margin-bottom: 14px;
}

.hero-tier-price .amount {
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.hero-tier-price .unit {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.hero-tier-specs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
}

.hero-tier-spec-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hero-tier-spec-item span:last-child {
  color: var(--text-main);
  font-weight: 600;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

/* --- 7. Section Titles --- */
.section-header {
  text-align: center;
  max-width: 660px;
  margin: 0 auto 56px auto;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 750;
  letter-spacing: -0.025em;
  line-height: 1.25;
  margin-bottom: 14px;
  color: var(--text-main);
}

.section-intro {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --- 8. Core Features (3 Slate Cards) --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
}

.feature-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 20px;
  font-variant-numeric: tabular-nums;
}

.feature-box h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.015em;
  color: var(--text-main);
}

.feature-box p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-meta {
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* --- 9. Streaming & AI Showcase (Monochrome Slate Aesthetic) --- */
.showcase-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.showcase-card {
  padding: 34px 30px;
}

.showcase-card-header {
  margin-bottom: 24px;
}

.showcase-card-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
  letter-spacing: -0.015em;
}

.showcase-card-header p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.slate-chip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.slate-chip {
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 12px 10px;
  text-align: center;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.slate-chip:hover {
  border-color: var(--border-card-hover);
  background: var(--bg-card-hover);
}

.slate-chip .chip-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  display: block;
  margin-bottom: 2px;
}

.slate-chip .chip-status {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: block;
}

.showcase-card-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- 10. Real Pricing Section (Official Real Tiers) --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-panel {
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
}

.pricing-panel.recommended {
  border-color: var(--text-main);
}

.pricing-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-main);
  margin-bottom: 12px;
}

.pricing-panel h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.pricing-panel .pricing-note {
  font-size: 0.86rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.pricing-panel .price-block {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-panel .currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.pricing-panel .num {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--text-main);
}

.pricing-panel .cycle {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.pricing-specs-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed var(--border-subtle);
  padding-bottom: 6px;
}

.pricing-spec-row .spec-val {
  color: var(--text-main);
  font-weight: 600;
}

/* --- 11. FAQ Accordion --- */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-card {
  padding: 0;
  overflow: hidden;
}

.faq-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 26px;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  background: none;
  cursor: pointer;
  transition: color 0.2s ease;
}

.faq-trigger:hover {
  color: var(--text-secondary);
}

.faq-icon-arrow {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}

.faq-card.open .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s ease;
  padding: 0 26px;
}

.faq-card.open .faq-body {
  max-height: 280px;
  padding-bottom: 22px;
}

.faq-body p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* --- 12. Reviews --- */
.reviews-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-box {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
}

.review-quote {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.review-avatar-text {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.review-author-info {
  display: flex;
  flex-direction: column;
}

.review-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
}

.review-title {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --- 13. Minimalist Footer (Strictly 4 Links) --- */
.site-footer {
  background: var(--bg-page);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 36px 0;
  transition: var(--transition-theme);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 38px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--text-main);
}

.footer-copy {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* --- 14. Sub-pages General & Articles / Insights Grid --- */
.page-container {
  max-width: 860px;
  margin: 120px auto 80px auto;
  padding: 0 28px;
}

.page-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 24px;
  margin-bottom: 36px;
}

.page-title {
  font-size: 2.3rem;
  font-weight: 750;
  letter-spacing: -0.025em;
  margin-bottom: 10px;
  color: var(--text-main);
}

.page-meta {
  font-size: 0.86rem;
  color: var(--text-muted);
}

.page-content {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 38px;
  margin-bottom: 14px;
  letter-spacing: -0.015em;
}

.page-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 22px;
  margin-bottom: 10px;
}

.page-content p {
  margin-bottom: 16px;
}

.page-content ul, .page-content ol {
  margin-bottom: 20px;
  padding-left: 20px;
}

.page-content li {
  margin-bottom: 8px;
}

/* Articles / Insights List */
.insights-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 28px;
}

.insight-card {
  padding: 28px;
}

.insight-card .insight-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  gap: 12px;
}

.insight-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  letter-spacing: -0.015em;
}

.insight-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
  margin-bottom: 16px;
}

.insight-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
}

/* --- 14b. Long-Form SEO Article Layout Components --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--text-main);
}

.article-header {
  margin-bottom: 32px;
}

.article-title {
  font-size: 2.25rem;
  font-weight: 750;
  line-height: 1.3;
  letter-spacing: -0.025em;
  color: var(--text-main);
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

/* Table of Contents (TOC) */
.toc-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0 40px 0;
}

.toc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 8px;
}

.toc-list a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.toc-list a:hover {
  color: var(--text-main);
  transform: translateX(4px);
}

.toc-list .toc-sub {
  padding-left: 18px;
  font-size: 0.88rem;
}

/* Article Prose & Formatting */
.article-body {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
  letter-spacing: -0.02em;
}

.article-body h3 {
  font-size: 1.22rem;
  font-weight: 650;
  color: var(--text-main);
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body strong {
  color: var(--text-main);
}

.article-body a {
  color: var(--text-main);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  opacity: 0.75;
}

.article-callout {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-left: 3px solid var(--text-main);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin: 26px 0;
  font-size: 0.94rem;
}

/* Tables inside articles */
.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.article-table th {
  background: var(--bg-subtle);
  color: var(--text-main);
  font-weight: 700;
  padding: 12px 16px;
  border: 1px solid var(--border-card);
}

.article-table td {
  padding: 12px 16px;
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
}

.article-table tr:hover td {
  background: var(--bg-subtle);
}

/* Article FAQ Box */
.article-faq-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.article-faq-item {
  margin-bottom: 24px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 22px 24px;
}

.article-faq-q {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.article-faq-a {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Related Reads Box */
.related-reads-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 20px;
}

.related-card {
  padding: 20px;
}

.related-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-card p {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .article-title {
    font-size: 1.75rem;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
}


/* --- 15. Responsive Media Queries --- */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.6rem;
  }
  .hero-tier-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .features-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .showcase-row {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .reviews-row {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 74px;
    left: 0;
    width: 100%;
    background: var(--bg-page);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
    box-shadow: var(--shadow-lift);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .mobile-toggle {
    display: flex;
  }

  .nav-actions .btn {
    display: none;
  }

  .nav-menu .mobile-cta {
    display: flex;
    width: 100%;
    margin-top: 10px;
  }

  .hero-section {
    padding-top: 115px;
    padding-bottom: 60px;
  }

  .hero-title {
    font-size: 2.05rem;
  }

  .hero-subtitle {
    font-size: 0.98rem;
  }

  .slate-chip-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }
  .btn {
    min-height: 48px;
  }
}