/* ==========================================================================
   SSOne Official Landing Site - Quantum Lightspeed Tunnel Theme
   Framework 03 | Domain: ssone-jc.lat
   Mobile-First Architecture: 320px, 375px, 390px, 768px, 1024px, 1280px+
   ========================================================================== */

:root {
  --bg-primary: #07020e;
  --bg-secondary: #0d061c;
  --bg-card: rgba(18, 9, 36, 0.75);
  --bg-card-hover: rgba(28, 14, 56, 0.85);
  --bg-glass: rgba(13, 6, 28, 0.8);
  --bg-input: rgba(15, 7, 30, 0.9);

  --border-subtle: rgba(168, 85, 247, 0.18);
  --border-focus: rgba(192, 132, 252, 0.6);
  --border-glow: rgba(0, 240, 255, 0.4);

  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-dim: #94a3b8;
  --text-subtle: #64748b;

  --accent-purple: #9333ea;
  --accent-neon-violet: #a855f7;
  --accent-light-violet: #c084fc;
  --accent-cyan: #00f0ff;
  --accent-cyan-glow: rgba(0, 240, 255, 0.35);
  --accent-magenta: #f43f5e;
  --accent-amber: #f59e0b;
  --accent-emerald: #10b981;

  --tunnel-beam: linear-gradient(90deg, #9333ea, #c084fc 45%, #00f0ff 75%, #a855f7);
  --tunnel-radial: radial-gradient(circle at 50% 20%, rgba(147, 51, 234, 0.22) 0%, rgba(7, 2, 14, 0.98) 75%);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --shadow-tunnel: 0 0 25px rgba(168, 85, 247, 0.25), 0 0 50px rgba(0, 240, 255, 0.1);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.55);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --max-w: 1200px;
  --header-height: 72px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.68;
  letter-spacing: -0.01em;
  background-image: 
    radial-gradient(ellipse 90% 60% at 50% -10%, rgba(147, 51, 234, 0.25), transparent 70%),
    radial-gradient(circle at 10% 40%, rgba(0, 240, 255, 0.08), transparent 45%),
    radial-gradient(circle at 90% 70%, rgba(168, 85, 247, 0.12), transparent 50%),
    linear-gradient(to bottom, #07020e 0%, #0d061c 50%, #07020e 100%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Accessibility: focus ring */
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
}

/* Typography elements */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 1.85rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.45rem;
  margin-top: 2rem;
  margin-bottom: 0.85rem;
  position: relative;
  padding-bottom: 0.45rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 3px;
  background: var(--tunnel-beam);
  border-radius: var(--radius-full);
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
  color: #e2e8f0;
}

h4 {
  font-size: 1.05rem;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  color: #cbd5e1;
}

p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

a {
  color: var(--accent-light-violet);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--accent-cyan);
}

ul, ol {
  padding-left: 1.35rem;
  margin-bottom: 1.15rem;
  color: var(--text-muted);
}

li {
  margin-bottom: 0.45rem;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ==========================================================================
   Navigation Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(7, 2, 14, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color 0.3s ease, background 0.3s ease;
}

.site-header.scrolled {
  border-bottom-color: rgba(192, 132, 252, 0.3);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.brand-logo img {
  height: 38px;
  width: auto;
}

.nav-menu {
  display: none;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.35rem;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.94rem;
  font-weight: 500;
  padding: 0.4rem 0.2rem;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--tunnel-beam);
  border-radius: var(--radius-full);
}

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Mobile Nav Toggle Button */
.mobile-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 38px;
  height: 38px;
  background: rgba(147, 51, 234, 0.15);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  transition: all 0.25s ease;
}

.mobile-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: all 0.25s ease;
}

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

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

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

/* Mobile Dropdown Menu */
.mobile-menu-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  background: rgba(10, 4, 22, 0.98);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1.5rem 1.25rem 2rem;
  display: none;
  flex-direction: column;
  gap: 1rem;
  z-index: 999;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.85);
}

.mobile-menu-drawer.open {
  display: flex;
}

.mobile-menu-drawer .nav-link {
  font-size: 1.05rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: block;
}

.mobile-menu-drawer .btn-cta {
  margin-top: 0.5rem;
  text-align: center;
  width: 100%;
}

/* ==========================================================================
   Buttons & CTA (Strict compliance with 3 prompt-allowed CTA texts)
   ========================================================================== */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.45rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: #07020e;
  background: linear-gradient(135deg, #c084fc 0%, #a855f7 40%, #00f0ff 100%);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: 0 0 18px rgba(168, 85, 247, 0.4), 0 0 35px rgba(0, 240, 255, 0.2);
  transition: all 0.25s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn-cta:hover {
  transform: translateY(-2px);
  color: #040108;
  box-shadow: 0 0 25px rgba(168, 85, 247, 0.65), 0 0 45px rgba(0, 240, 255, 0.4);
}

.btn-cta-lg {
  padding: 0.85rem 2rem;
  font-size: 1.05rem;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.62rem 1.35rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-main);
  background: rgba(147, 51, 234, 0.12);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-outline:hover {
  background: rgba(147, 51, 234, 0.25);
  border-color: var(--accent-light-violet);
  color: #ffffff;
}

/* ==========================================================================
   Hero Section - Quantum Lightspeed Tunnel
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 3.5rem 0 3rem;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-tunnel-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background: 
    radial-gradient(circle at 50% 35%, rgba(168, 85, 247, 0.18) 0%, transparent 60%),
    radial-gradient(circle at 50% 70%, rgba(0, 240, 255, 0.08) 0%, transparent 50%);
  z-index: 1;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.65;
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: rgba(147, 51, 234, 0.2);
  border: 1px solid rgba(192, 132, 252, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--accent-light-violet);
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.hero-badge .pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulse-glow 2s infinite ease-in-out;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.2); }
}

.hero-title {
  font-size: 2.1rem;
  font-weight: 900;
  line-height: 1.22;
  margin-bottom: 1.15rem;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #ffffff 0%, #e2e8f0 70%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.85rem;
  max-width: 740px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.hero-specs-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
}

.spec-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  text-align: center;
}

.spec-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.spec-val {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

/* ==========================================================================
   Section Blocks & Cards
   ========================================================================== */
.section {
  padding: 3.5rem 0;
  position: relative;
}

.section-alt {
  background: rgba(13, 6, 28, 0.45);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: 2.25rem;
  text-align: left;
}

.section-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-light-violet);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: inline-block;
  margin-bottom: 0.35rem;
}

.section-subtitle {
  font-size: 0.98rem;
  color: var(--text-dim);
  max-width: 680px;
  margin-top: 0.5rem;
}

/* Card Grid */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

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

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.card:hover {
  border-color: var(--border-focus);
  box-shadow: 0 10px 25px rgba(147, 51, 234, 0.15);
  transform: translateY(-2px);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(147, 51, 234, 0.2);
  border: 1px solid rgba(192, 132, 252, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--accent-cyan);
}

.card-title {
  font-size: 1.15rem;
  margin-bottom: 0.65rem;
  color: #ffffff;
}

.card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0.85rem;
}

/* Informative Callout / Alert Box */
.notice-box {
  background: rgba(147, 51, 234, 0.1);
  border-left: 3px solid var(--accent-light-violet);
  padding: 1rem 1.15rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.25rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.notice-box strong {
  color: var(--text-main);
}

.notice-warning {
  background: rgba(245, 158, 11, 0.1);
  border-left-color: var(--accent-amber);
}

/* Feature lists */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0;
}

.feature-list li {
  position: relative;
  padding-left: 1.45rem;
  margin-bottom: 0.5rem;
  font-size: 0.92rem;
}

.feature-list li::before {
  content: "✦";
  position: absolute;
  left: 0;
  color: var(--accent-light-violet);
  font-size: 0.85rem;
}

/* ==========================================================================
   Pricing & Plans Module (Strictly factual, no fake guarantees)
   ========================================================================== */
.pricing-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent-light-violet);
  box-shadow: 0 0 30px rgba(168, 85, 247, 0.25);
}

.pricing-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(0, 240, 255, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.pricing-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.pricing-subtitle {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 1.25rem;
}

.pricing-field {
  display: flex;
  justify-content: space-between;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.88rem;
}

.pricing-field-label {
  color: var(--text-dim);
}

.pricing-field-value {
  color: var(--text-main);
  font-weight: 500;
  text-align: right;
}

.pricing-actions {
  margin-top: 1.5rem;
}

/* ==========================================================================
   Data Tables
   ========================================================================== */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.5rem 0;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-card);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

th {
  background: rgba(147, 51, 234, 0.2);
  color: #ffffff;
  padding: 0.85rem 1rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: rgba(147, 51, 234, 0.07);
}

/* ==========================================================================
   Article Layout & Typography (GEO Content & Reader Experience)
   ========================================================================== */
.article-header {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 2rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.84rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* Table of Contents */
.toc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 2rem;
}

.toc-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 0.5rem;
  font-size: 0.88rem;
}

.toc-list a {
  color: var(--text-dim);
  display: block;
  transition: color 0.2s ease;
}

.toc-list a:hover {
  color: var(--accent-light-violet);
}

/* Article Content Body */
.article-body {
  font-size: 1rem;
  line-height: 1.82;
  color: #e2e8f0;
}

.article-body h2 {
  font-size: 1.38rem;
  margin-top: 2.25rem;
  margin-bottom: 1rem;
  color: #ffffff;
}

.article-body h3 {
  font-size: 1.15rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: #f1f5f9;
}

.article-body p {
  margin-bottom: 1.25rem;
  color: #cbd5e1;
}

/* GEO Content Direct Answer Box */
.geo-answer-block {
  background: rgba(147, 51, 234, 0.12);
  border: 1px solid rgba(192, 132, 252, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  color: #f8fafc;
  font-size: 0.96rem;
  line-height: 1.75;
}

.geo-answer-block strong {
  color: var(--accent-cyan);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.tag-badge {
  font-size: 0.78rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(147, 51, 234, 0.15);
  border: 1px solid var(--border-subtle);
  color: var(--accent-light-violet);
}

/* Related Articles Block */
.related-posts {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   Accordion / FAQ Component
   ========================================================================== */
.faq-item {
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  margin-bottom: 0.85rem;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item.active {
  border-color: rgba(192, 132, 252, 0.45);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.1rem 1.25rem;
  font-size: 0.98rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.faq-icon {
  font-size: 1.15rem;
  color: var(--accent-light-violet);
  transition: transform 0.25s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--accent-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 800px;
  padding-bottom: 1.1rem;
  transition: max-height 0.35s ease-in-out;
}

/* ==========================================================================
   User Feedback Form (No fake reviews)
   ========================================================================== */
.feedback-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-top: 1.5rem;
}

.form-group {
  margin-bottom: 1.15rem;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  color: #ffffff;
  margin-bottom: 0.45rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 0.95rem;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.92rem;
  transition: border-color 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px rgba(0, 240, 255, 0.2);
}

textarea.form-control {
  resize: vertical;
  min-height: 110px;
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
  padding: 1rem 0;
  font-size: 0.84rem;
  color: var(--text-dim);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.breadcrumb-item a:hover {
  color: var(--accent-light-violet);
}

.breadcrumb-separator {
  color: var(--text-subtle);
  font-size: 0.75rem;
}

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

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: #040108;
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2rem;
  margin-top: 4rem;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--tunnel-beam);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-top: 0.85rem;
  max-width: 320px;
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.55rem;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-dim);
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  padding-top: 1.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.82rem;
  color: var(--text-subtle);
}

.footer-disclaimer {
  font-size: 0.8rem;
  color: var(--text-subtle);
  line-height: 1.5;
}

/* ==========================================================================
   Responsive Breakpoints: 320px, 375px, 390px, 768px, 1024px, 1280px+
   ========================================================================== */

/* 320px and smaller phones */
@media (max-width: 360px) {
  html {
    font-size: 14.5px;
  }
  .container {
    padding-left: 0.85rem;
    padding-right: 0.85rem;
  }
  .hero-title {
    font-size: 1.65rem;
  }
  .hero-specs-row {
    grid-template-columns: 1fr;
  }
  .btn-cta {
    width: 100%;
    padding: 0.65rem 1rem;
  }
}

/* 375px - 390px (iPhone SE, mini, 12/13/14 standard) */
@media (min-width: 375px) {
  .hero-title {
    font-size: 1.85rem;
  }
}

@media (min-width: 390px) {
  .hero-title {
    font-size: 1.95rem;
  }
}

/* Tablet (768px+) */
@media (min-width: 768px) {
  .hero-title {
    font-size: 2.6rem;
  }
  .hero-lead {
    font-size: 1.15rem;
  }
  .hero-specs-row {
    grid-template-columns: repeat(4, 1fr);
  }
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-layout {
    grid-template-columns: 280px 1fr;
    align-items: start;
  }
  .toc-sticky-wrapper {
    position: sticky;
    top: calc(var(--header-height) + 1.5rem);
  }
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .mobile-toggle {
    display: none;
  }
  .nav-menu {
    display: block;
  }
  .hero-title {
    font-size: 3rem;
  }
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
  .article-layout {
    grid-template-columns: 300px 1fr;
    gap: 3rem;
  }
}

/* Large Screens (1280px+) */
@media (min-width: 1280px) {
  .hero-title {
    font-size: 3.25rem;
  }
}