/* ==========================================================================
   KTM Cloud (ktmyun.xyz) - Fused Silica Optics (熔融石英与光纤熔接风) CSS
   ========================================================================== */

:root {
  --bg-dark: #0C0E11;
  --bg-card: rgba(18, 22, 29, 0.72);
  --bg-card-hover: rgba(26, 31, 41, 0.85);
  --bg-glass-nav: rgba(12, 14, 17, 0.82);
  
  --accent-orange: #FF6B00;
  --accent-orange-glow: rgba(255, 107, 0, 0.38);
  --accent-orange-bright: #FF8526;
  --accent-cyan: #00F0FF;
  --accent-cyan-glow: rgba(0, 240, 255, 0.25);
  
  --text-main: #F0F3F8;
  --text-muted: #8E9BAE;
  --text-dim: #5C6779;
  
  --border-specular: rgba(255, 255, 255, 0.12);
  --border-specular-hover: rgba(255, 107, 0, 0.5);
  --border-glass-top: rgba(255, 255, 255, 0.22);
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 9999px;
  
  --shadow-specular: inset 0 1px 1px rgba(255, 255, 255, 0.15), 0 20px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px var(--accent-orange-glow);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
  background: var(--bg-dark);
  color: var(--text-main);
  overflow-x: hidden;
  cursor: default;
}

/* --------------------------------------------------------------------------
   Custom Optic Light Trail Cursor (鼠标换尾翼)
   -------------------------------------------------------------------------- */
#cursor-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* Background Fiber Grid Pattern */
.bg-fiber-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(255, 107, 0, 0.08) 0%, transparent 60%),
    radial-gradient(circle at 85% 40%, rgba(0, 240, 255, 0.04) 0%, transparent 50%),
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
}

.content-wrapper {
  position: relative;
  z-index: 2;
}

a {
  color: var(--accent-orange-bright);
  text-decoration: none;
  transition: all 0.25s ease;
}

a:hover {
  color: #FFA552;
  text-shadow: 0 0 10px rgba(255, 107, 0, 0.5);
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --------------------------------------------------------------------------
   Header / Navigation Bar
   -------------------------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-glass-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-specular);
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-logo .optic-node {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-pill);
  background: radial-gradient(circle at 30% 30%, #FF8526, var(--accent-orange));
  box-shadow: 0 0 15px var(--accent-orange-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.brand-logo .optic-node::after {
  content: '';
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #FFF;
  box-shadow: 0 0 10px #FFF;
}

.brand-name-tag {
  background: linear-gradient(135deg, #FFFFFF 30%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.domain-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 107, 0, 0.15);
  border: 1px solid rgba(255, 107, 0, 0.3);
  color: var(--accent-orange-bright);
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-orange);
  box-shadow: 0 0 8px var(--accent-orange);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, #FF7B1A, #FF5500);
  color: #FFF !important;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 0 20px var(--accent-orange-glow);
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(255, 107, 0, 0.6);
  color: #FFF;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   Fused Silica Optics Specular Cards & Components
   -------------------------------------------------------------------------- */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-specular);
  border-top-color: var(--border-glass-top);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-specular);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.05) 50%,
    transparent 100%
  );
  transition: transform 0.6s ease;
  pointer-events: none;
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-specular-hover);
  transform: translateY(-4px);
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.25), 0 25px 50px rgba(0, 0, 0, 0.7), 0 0 20px var(--accent-orange-glow);
}

.glass-card:hover::before {
  transform: translateX(200%);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 160px 0 90px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: rgba(255, 107, 0, 0.1);
  border: 1px solid rgba(255, 107, 0, 0.25);
  color: var(--accent-orange-bright);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-tag .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-orange);
  box-shadow: 0 0 10px var(--accent-orange);
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 107, 0, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 10px rgba(255, 107, 0, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 107, 0, 0); }
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #FFFFFF 20%, #FF8526 70%, #FF5500 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 40px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 36px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, #FF7B1A, #FF4500);
  color: #FFF !important;
  font-size: 1.05rem;
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 0 30px var(--accent-orange-glow);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 45px rgba(255, 107, 0, 0.7);
  color: #FFF !important;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 32px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-specular);
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 600;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  color: #FFF;
}

.hero-stats-row {
  display: flex;
  gap: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-specular);
}

.hero-stat-item {
  display: flex;
  flex-direction: column;
}

.hero-stat-val {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.hero-stat-val span {
  color: var(--accent-orange);
}

.hero-stat-lbl {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Optical Refraction Visual Profile Card */
.hero-optics-card {
  padding: 30px;
}

.optics-diagram-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-specular);
}

.optics-diagram-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-orange-bright);
}

.optics-status-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid rgba(0, 240, 255, 0.3);
  color: var(--accent-cyan);
  padding: 2px 8px;
  border-radius: 4px;
}

.fiber-path-graphic {
  width: 100%;
  height: 220px;
  position: relative;
}

/* --------------------------------------------------------------------------
   Feature Cards Grid (Fused Silica Advantage)
   -------------------------------------------------------------------------- */
.section-padding {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-subtitle {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-orange);
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  padding: 36px 28px;
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(255, 107, 0, 0.1);
  border: 1px solid rgba(255, 107, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--accent-orange);
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(255, 107, 0, 0.2);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   Pricing Section
   -------------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  padding: 36px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.pricing-card.popular {
  border-color: var(--accent-orange);
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.3), 0 0 35px rgba(255, 107, 0, 0.35);
  background: linear-gradient(180deg, rgba(25, 30, 42, 0.95) 0%, rgba(18, 22, 29, 0.9) 100%);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background: linear-gradient(135deg, #FF7B1A, #FF4500);
  color: #FFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 12px rgba(255, 107, 0, 0.4);
}

.plan-name {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.plan-price-box {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-specular);
}

.plan-price {
  font-size: 2.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1;
}

.plan-price span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.plan-features-list {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features-list li i {
  color: var(--accent-orange);
  font-size: 0.9rem;
}

.plan-cta-btn {
  width: 100%;
  padding: 14px 0;
  text-align: center;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  display: block;
}

/* --------------------------------------------------------------------------
   Articles / Knowledge Base Grid
   -------------------------------------------------------------------------- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.article-tag {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-specular);
  color: var(--accent-orange-bright);
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-title a {
  color: var(--text-main);
}

.article-title a:hover {
  color: var(--accent-orange-bright);
}

.article-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-link {
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-orange-bright);
}

.article-link i {
  transition: transform 0.25s ease;
}

.article-link:hover i {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   Testimonials (用户评价)
   -------------------------------------------------------------------------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  padding: 32px 28px;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FF6B00, #333);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #FFF;
  border: 1px solid var(--border-glass-top);
}

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.user-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.testimonial-stars {
  color: #FFB800;
  font-size: 0.85rem;
  margin-bottom: 14px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   FAQ Accordion Section
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 22px 28px;
  text-align: left;
  background: var(--bg-card);
  border: 1px solid var(--border-specular);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.faq-question:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-specular-hover);
}

.faq-question i {
  color: var(--accent-orange);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  background: rgba(12, 14, 17, 0.6);
  border: 1px solid transparent;
  border-top: none;
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

.faq-item.active .faq-answer {
  max-height: 500px;
  transition: max-height 0.4s ease-in-out;
  border-color: var(--border-specular);
}

.faq-answer-inner {
  padding: 22px 28px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   CTA Banner Section
   -------------------------------------------------------------------------- */
.cta-banner {
  margin: 60px 0 100px;
}

.cta-banner-card {
  padding: 60px 40px;
  text-align: center;
  background: radial-gradient(circle at 50% 0%, rgba(255, 107, 0, 0.2) 0%, rgba(18, 22, 29, 0.85) 70%);
  border: 1px solid var(--border-specular-hover);
  box-shadow: 0 0 50px rgba(255, 107, 0, 0.2);
}

.cta-banner-title {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 32px;
}

/* --------------------------------------------------------------------------
   Footer PBN Section (页脚 PBN 权重精准输血管道)
   -------------------------------------------------------------------------- */
footer {
  background: #080A0D;
  border-top: 1px solid var(--border-specular);
  padding: 60px 0 30px;
  position: relative;
  z-index: 5;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 30px;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 14px;
  line-height: 1.6;
  max-width: 360px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

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

/* PBN Friendly Links Pipeline Area (页脚 PBN 权重区) */
.pbn-pipeline-wrapper {
  padding: 20px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  margin-bottom: 24px;
}

.pbn-pipeline-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  text-align: center;
}

.pbn-pipeline-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 20px;
  list-style: none;
}

.pbn-pipeline-links li a {
  font-size: 0.78rem;
  color: #626D7F;
  transition: color 0.25s ease;
  font-weight: 400;
}

.pbn-pipeline-links li a:hover {
  color: var(--accent-orange-bright);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* --------------------------------------------------------------------------
   Article Page Specific Styling
   -------------------------------------------------------------------------- */
.article-header {
  padding: 150px 0 40px;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.article-main-content {
  max-width: 840px;
  margin: 0 auto 80px;
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-specular);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-specular);
}

.article-main-content h1,
.article-main-content h2,
.article-main-content h3 {
  color: var(--text-main);
  margin: 32px 0 16px;
  line-height: 1.3;
}

.article-main-content h2 {
  font-size: 1.6rem;
  border-bottom: 1px solid var(--border-specular);
  padding-bottom: 10px;
}

.article-main-content h3 {
  font-size: 1.25rem;
  color: var(--accent-orange-bright);
}

.article-main-content p {
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

.article-main-content ul,
.article-main-content ol {
  margin: 0 0 20px 24px;
  color: var(--text-muted);
  line-height: 1.8;
}

.article-main-content blockquote {
  border-left: 4px solid var(--accent-orange);
  padding: 16px 20px;
  background: rgba(255, 107, 0, 0.05);
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-main);
}

.article-cta-box {
  margin: 40px 0;
  padding: 30px;
  background: linear-gradient(135deg, rgba(255, 107, 0, 0.12), rgba(18, 22, 29, 0.8));
  border: 1px solid rgba(255, 107, 0, 0.4);
  border-radius: var(--radius-md);
  text-align: center;
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid,
  .articles-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--bg-dark);
    padding: 24px;
    border-bottom: 1px solid var(--border-specular);
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .features-grid,
  .pricing-grid,
  .articles-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .article-main-content {
    padding: 24px 18px;
  }
}

/* ==========================================================================
   Client Download Modal Component (KTM云 Fused Silica Optics Style)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(6, 8, 12, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 1.25rem;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

body.modal-open {
  overflow: hidden;
}

.modal-container {
  background: linear-gradient(145deg, rgba(20, 24, 33, 0.98), rgba(12, 15, 22, 0.98));
  border: 1px solid var(--border-specular);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8), 0 0 35px var(--accent-orange-glow);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 540px;
  position: relative;
  overflow: hidden;
  transform: scale(0.94) translateY(15px);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  padding: 2.2rem;
}

.modal-overlay.active .modal-container {
  transform: scale(1) translateY(0);
}

.modal-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-orange), var(--accent-cyan), transparent);
}

.modal-close-btn {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-specular);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  cursor: pointer;
  transition: all 0.25s ease;
  line-height: 1;
}

.modal-close-btn:hover {
  background: rgba(255, 107, 0, 0.2);
  border-color: var(--accent-orange);
  color: #fff;
  transform: rotate(90deg);
}

.modal-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.modal-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-orange-bright);
  background: rgba(255, 107, 0, 0.12);
  border: 1px solid rgba(255, 107, 0, 0.25);
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-pill);
  margin-bottom: 0.8rem;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.modal-plan-notice {
  display: none;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255, 107, 0, 0.08);
  border: 1px solid rgba(255, 107, 0, 0.2);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.9rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.modal-plan-notice.active {
  display: flex;
}

.modal-plan-tag {
  font-weight: 700;
  color: var(--accent-orange-bright);
}

/* Strictly Android & iOS Buttons */
.modal-platforms-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.platform-btn-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1.35rem 0.8rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-specular);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-main);
  transition: all 0.25s ease;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.platform-btn-card:hover {
  background: rgba(255, 107, 0, 0.09);
  border-color: var(--accent-orange);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(255, 107, 0, 0.2);
}

.platform-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  font-size: 1.6rem;
  transition: all 0.25s ease;
}

.platform-btn-card.android .platform-icon {
  color: #3DDC84;
}

.platform-btn-card.android:hover .platform-icon {
  background: rgba(61, 220, 132, 0.15);
}

.platform-btn-card.ios .platform-icon {
  color: #00F0FF;
}

.platform-btn-card.ios:hover .platform-icon {
  background: rgba(0, 240, 255, 0.15);
}

.platform-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
}

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

.platform-action-badge {
  margin-top: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-orange-bright));
  color: #fff;
  padding: 0.25rem 0.8rem;
  border-radius: var(--radius-pill);
}

.modal-notice-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.modal-notice-box i {
  color: var(--accent-cyan);
  font-size: 1rem;
  margin-top: 2px;
}

.modal-footer-link {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.modal-footer-link a {
  color: var(--accent-orange-bright);
  text-decoration: underline;
}

/* ==========================================================================
   Download Center Page Dedicated Styles (/download/)
   ========================================================================== */
.breadcrumb-bar {
  padding: 1.25rem 0;
  font-size: 0.85rem;
  color: var(--text-dim);
}

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

.breadcrumb-bar a:hover {
  color: var(--accent-orange);
}

.breadcrumb-bar span {
  color: var(--accent-orange-bright);
}

.download-hero {
  text-align: center;
  padding: 3rem 0 2rem;
}

.download-platforms-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  margin: 2.5rem 0 3.5rem;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border-specular);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  position: relative;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
}

.download-card:hover,
.download-card.highlight {
  border-color: var(--accent-orange);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), 0 0 25px var(--accent-orange-glow);
  transform: translateY(-4px);
}

.download-card-badge {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-orange-bright));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-pill);
}

.download-card-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.download-card.android-card .download-card-icon {
  background: rgba(61, 220, 132, 0.12);
  color: #3DDC84;
}

.download-card.ios-card .download-card-icon {
  background: rgba(0, 240, 255, 0.12);
  color: #00F0FF;
}

.download-card-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.download-version-info {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.download-card-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.download-features-list {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.download-features-list li {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.download-features-list li i {
  color: var(--accent-orange);
  font-size: 0.85rem;
}

.download-steps-section {
  padding: 3rem 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-specular);
  border-radius: var(--radius-md);
  padding: 1.8rem 1.4rem;
  position: relative;
  transition: all 0.25s ease;
}

.step-card:hover {
  border-color: var(--border-specular-hover);
  transform: translateY(-3px);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-orange);
  opacity: 0.6;
  margin-bottom: 0.8rem;
  line-height: 1;
}

.step-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
  color: var(--text-main);
}

.step-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
}

@media (max-width: 768px) {
  .modal-platforms-grid {
    grid-template-columns: 1fr;
  }
  .download-platforms-matrix {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
}