/* ==========================================================================
   NCloud 奇异云网 (qi-ncloud.mom) - Pure Native CSS Design System
   Obsidian Quantum Horizon Aesthetic | Zero JS Required | Instant Load
   ========================================================================== */

:root {
  --bg-void: #050911;
  --bg-deep: #080f1d;
  --bg-card: rgba(12, 20, 36, 0.74);
  --bg-card-solid: #0c1424;
  --bg-card-hover: rgba(17, 29, 51, 0.88);
  --border-subtle: rgba(148, 163, 184, 0.14);
  --border-glow: rgba(140, 214, 252, 0.38);

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-soft: #cbd5e1;

  --accent-cyan: #8cd6fc;
  --accent-mint: #bae6fd;
  --accent-blue: #93c5fd;
  --accent-ice: #bae6fd;
  --accent-amber: #fbbf24;
  --gradient-brand: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 48%, #7dd3fc 100%);
  --gradient-brand-soft: linear-gradient(135deg, rgba(140, 214, 252, 0.16) 0%, rgba(186, 230, 253, 0.12) 100%);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 26px;

  --shadow-card: 0 18px 45px rgba(2, 6, 23, 0.55);
  --shadow-glow: 0 0 32px rgba(140, 214, 252, 0.22);

  --container-max: 1240px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-main);
  background-color: var(--bg-void);
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3, h4, p {
  margin-top: 0;
}

/* ==========================================================================
   Pure CSS Dynamic Animated Background Stage
   ========================================================================== */

.bg-stage {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 50% -15%, rgba(140, 214, 252, 0.14), transparent 70%),
    linear-gradient(180deg, #050911 0%, #070e1b 52%, #050810 100%);
}

.cyber-lattice {
  position: absolute;
  inset: -40px;
  background-image:
    linear-gradient(to right, rgba(140, 214, 252, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(186, 230, 253, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 85% 75% at 50% 35%, #000 35%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 85% 75% at 50% 35%, #000 35%, transparent 100%);
  animation: latticeDrift 28s linear infinite;
}

.nebula-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  will-change: transform, opacity;
}

.nebula-orb--cyan {
  width: 560px;
  height: 560px;
  top: -120px;
  left: -100px;
  background: radial-gradient(circle, rgba(140, 214, 252, 0.26) 0%, rgba(140, 214, 252, 0) 70%);
  animation: orbFloatA 22s ease-in-out infinite alternate;
}

.nebula-orb--mint {
  width: 500px;
  height: 500px;
  top: 26%;
  right: -130px;
  background: radial-gradient(circle, rgba(186, 230, 253, 0.22) 0%, rgba(186, 230, 253, 0) 70%);
  animation: orbFloatB 26s ease-in-out infinite alternate;
}

.nebula-orb--indigo {
  width: 620px;
  height: 620px;
  bottom: -180px;
  left: 28%;
  background: radial-gradient(circle, rgba(147, 197, 253, 0.16) 0%, rgba(147, 197, 253, 0) 72%);
  animation: orbFloatC 30s ease-in-out infinite alternate;
}

.orbital-particles {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 14% 22%, rgba(140, 214, 252, 0.65), transparent),
    radial-gradient(1.5px 1.5px at 32% 68%, rgba(186, 230, 253, 0.55), transparent),
    radial-gradient(2px 2px at 54% 18%, rgba(147, 197, 253, 0.55), transparent),
    radial-gradient(1.5px 1.5px at 78% 42%, rgba(140, 214, 252, 0.6), transparent),
    radial-gradient(2px 2px at 88% 79%, rgba(186, 230, 253, 0.5), transparent),
    radial-gradient(1.5px 1.5px at 22% 86%, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1.5px 1.5px at 66% 91%, rgba(140, 214, 252, 0.55), transparent);
  background-size: 460px 460px;
  opacity: 0.72;
  animation: starRise 42s linear infinite;
}

.scan-beam {
  position: absolute;
  left: 0;
  right: 0;
  height: 180px;
  background: linear-gradient(180deg, transparent 0%, rgba(140, 214, 252, 0.045) 50%, transparent 100%);
  animation: scanSweep 14s ease-in-out infinite;
}

@keyframes latticeDrift {
  0% { transform: translate3d(0, 0, 0); }
  100% { transform: translate3d(56px, 56px, 0); }
}

@keyframes orbFloatA {
  0% { transform: translate3d(0, 0, 0) scale(1); opacity: 0.75; }
  50% { transform: translate3d(90px, 60px, 0) scale(1.12); opacity: 0.95; }
  100% { transform: translate3d(30px, 120px, 0) scale(0.95); opacity: 0.7; }
}

@keyframes orbFloatB {
  0% { transform: translate3d(0, 0, 0) scale(1); opacity: 0.7; }
  50% { transform: translate3d(-110px, -40px, 0) scale(1.15); opacity: 0.95; }
  100% { transform: translate3d(-50px, 90px, 0) scale(0.92); opacity: 0.65; }
}

@keyframes orbFloatC {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-80px, -70px, 0) scale(1.1); }
}

@keyframes starRise {
  0% { background-position: 0 0; }
  100% { background-position: 0 -460px; }
}

@keyframes scanSweep {
  0% { transform: translateY(-20vh); opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { transform: translateY(110vh); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .cyber-lattice,
  .nebula-orb,
  .orbital-particles,
  .scan-beam,
  .marquee-track,
  .pulse-dot {
    animation: none !important;
  }
}

/* ==========================================================================
   Layout Utilities & Typography
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 76px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 44px;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(140, 214, 252, 0.1);
  border: 1px solid rgba(140, 214, 252, 0.25);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  line-height: 1.25;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.02rem;
  margin-bottom: 0;
}

.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.96rem;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #06182c;
  box-shadow: 0 8px 26px rgba(125, 211, 252, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(186, 230, 253, 0.44);
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.72);
  color: var(--text-main);
  border-color: var(--border-subtle);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
  border-radius: 8px;
}

/* ==========================================================================
   Sticky Header & Top-Left Logo
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 9, 17, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 70px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid rgba(140, 214, 252, 0.4);
  box-shadow: 0 0 18px rgba(140, 214, 252, 0.22);
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.brand-domain {
  font-size: 0.74rem;
  font-family: var(--font-mono);
  color: var(--accent-mint);
}

.desktop-nav {
  display: none;
  align-items: center;
  gap: 22px;
}

.desktop-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-soft);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mobile-nav-details {
  position: relative;
}

.mobile-nav-toggle {
  list-style: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.8);
  color: var(--text-main);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
}

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

.mobile-nav-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  width: 220px;
  background: rgba(10, 17, 32, 0.96);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  padding: 10px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav-panel a {
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.92rem;
  color: var(--text-soft);
}

.mobile-nav-panel a:hover {
  background: rgba(140, 214, 252, 0.12);
  color: var(--accent-cyan);
}

@media (min-width: 960px) {
  .desktop-nav {
    display: flex;
  }
  .mobile-nav-details {
    display: none;
  }
}

/* ==========================================================================
   Hero Section & Live Node Telemetry Card
   ========================================================================== */

.hero {
  padding: 64px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

@media (min-width: 960px) {
  .hero {
    padding: 84px 0 60px;
  }
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(140, 214, 252, 0.1);
  border: 1px solid rgba(140, 214, 252, 0.3);
  color: var(--accent-cyan);
  font-size: 0.84rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-mint);
  box-shadow: 0 0 0 0 rgba(186, 230, 253, 0.7);
  animation: pulseRing 2.2s infinite;
}

@keyframes pulseRing {
  0% { box-shadow: 0 0 0 0 rgba(186, 230, 253, 0.7); }
  70% { box-shadow: 0 0 0 9px rgba(186, 230, 253, 0); }
  100% { box-shadow: 0 0 0 0 rgba(186, 230, 253, 0); }
}

.hero-title {
  font-size: clamp(2rem, 4.4vw, 3.25rem);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 18px;
}

.hero-lead {
  font-size: 1.06rem;
  color: var(--text-soft);
  margin-bottom: 26px;
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.hero-trust-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
}

.trust-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  backdrop-filter: blur(10px);
}

.trust-pill strong {
  display: block;
  font-size: 1.05rem;
  color: var(--accent-mint);
}

.trust-pill span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Telemetry Card */
.telemetry-card {
  background: linear-gradient(160deg, rgba(14, 24, 44, 0.88) 0%, rgba(8, 14, 27, 0.92) 100%);
  border: 1px solid rgba(140, 214, 252, 0.28);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  backdrop-filter: blur(14px);
}

.telemetry-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.telemetry-title {
  font-size: 0.92rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.telemetry-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--accent-mint);
  font-weight: 600;
}

.node-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.node-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(148, 163, 184, 0.09);
  font-size: 0.88rem;
}

.node-name {
  font-weight: 600;
  color: var(--text-main);
}

.node-tag {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(147, 197, 253, 0.14);
  color: var(--accent-blue);
  font-family: var(--font-mono);
}

.node-ping {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-mint);
  font-weight: 700;
}

.coupon-box {
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.12) 0%, rgba(140, 214, 252, 0.09) 100%);
  border: 1px dashed rgba(251, 191, 36, 0.45);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.coupon-label {
  font-size: 0.82rem;
  color: var(--text-soft);
}

.coupon-code {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--accent-amber);
  background: rgba(251, 191, 36, 0.12);
  padding: 4px 10px;
  border-radius: 6px;
  letter-spacing: 0.03em;
}

/* ==========================================================================
   Infinite Marquee Ticker
   ========================================================================== */

.marquee-bar {
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(9, 15, 28, 0.72);
  overflow: hidden;
  padding: 13px 0;
}

.marquee-track {
  display: flex;
  width: max-content;
  gap: 38px;
  animation: tickerScroll 34s linear infinite;
}

.marquee-track span {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-soft);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.marquee-track span::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

@keyframes tickerScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ==========================================================================
   Pricing Section - Strictly Same Row on Desktop (4 Columns)
   ========================================================================== */

.pricing-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: stretch;
}

@media (min-width: 600px) and (max-width: 959px) {
  .pricing-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .pricing-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
}

.plan-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.plan-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.plan-card--featured {
  background: linear-gradient(180deg, rgba(13, 30, 48, 0.92) 0%, rgba(10, 19, 34, 0.9) 100%);
  border-color: rgba(125, 211, 252, 0.52);
  box-shadow: var(--shadow-card), 0 0 38px rgba(125, 211, 252, 0.16);
}

.plan-badge {
  position: absolute;
  top: -12px;
  right: 18px;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 800;
  background: var(--gradient-brand);
  color: #06182c;
}

.plan-tier {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.plan-name {
  font-size: 1.32rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 6px;
}

.plan-currency {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-mint);
}

.plan-price {
  font-size: 2.35rem;
  line-height: 1;
  font-weight: 800;
  color: var(--text-main);
}

.plan-period {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-annual {
  font-size: 0.82rem;
  color: var(--accent-amber);
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.2);
  border-radius: 6px;
  padding: 5px 9px;
  margin-bottom: 16px;
}

.plan-quota {
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--gradient-brand-soft);
  border: 1px solid rgba(140, 214, 252, 0.22);
  margin-bottom: 16px;
  text-align: center;
}

.plan-quota strong {
  display: block;
  font-size: 1.14rem;
  color: var(--accent-mint);
}

.plan-quota span {
  font-size: 0.78rem;
  color: var(--text-soft);
}

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 22px;
  flex: 1;
}

.plan-features li {
  position: relative;
  padding-left: 20px;
  font-size: 0.87rem;
  color: var(--text-soft);
  line-height: 1.45;
}

.plan-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-mint);
  font-weight: 800;
}

.plan-cta {
  width: 100%;
  margin-top: auto;
}

.pricing-footnote {
  margin-top: 22px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: rgba(12, 20, 36, 0.72);
  border: 1px solid var(--border-subtle);
  font-size: 0.9rem;
  color: var(--text-soft);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

/* Comparison Table */
.table-wrap {
  margin-top: 32px;
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
  font-size: 0.92rem;
}

.spec-table th,
.spec-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.spec-table thead th {
  background: rgba(140, 214, 252, 0.08);
  color: var(--accent-cyan);
  font-weight: 700;
}

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

.spec-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.025);
}

/* ==========================================================================
   Bento Features & Architecture Grid
   ========================================================================== */

.bento-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 20px;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  backdrop-filter: blur(12px);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.bento-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.bento-icon {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  background: var(--gradient-brand-soft);
  border: 1px solid rgba(140, 214, 252, 0.25);
  color: var(--accent-cyan);
  margin-bottom: 16px;
}

.bento-card h3 {
  font-size: 1.14rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.bento-card p {
  font-size: 0.94rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ==========================================================================
   3-Step Client Quickstart
   ========================================================================== */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 800;
  color: var(--accent-mint);
  margin-bottom: 10px;
  display: inline-block;
}

.step-card h3 {
  font-size: 1.12rem;
  margin-bottom: 8px;
}

.step-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 0;
}

/* ==========================================================================
   Articles Grid (Landing & Related)
   ========================================================================== */

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.tag-chip {
  font-size: 0.74rem;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(140, 214, 252, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(140, 214, 252, 0.2);
}

.article-card h3 {
  font-size: 1.08rem;
  line-height: 1.42;
  margin-bottom: 10px;
  color: var(--text-main);
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  flex: 1;
}

.article-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.84rem;
  color: var(--accent-mint);
  font-weight: 600;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   User Reviews Section
   ========================================================================== */

.rating-banner {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 18px;
  border-radius: 999px;
  background: rgba(186, 230, 253, 0.1);
  border: 1px solid rgba(186, 230, 253, 0.28);
  color: var(--accent-mint);
  font-size: 0.9rem;
  font-weight: 700;
  margin-top: 14px;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.review-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.reviewer-info strong {
  display: block;
  font-size: 0.98rem;
}

.reviewer-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.review-stars {
  color: var(--accent-amber);
  font-size: 0.95rem;
  letter-spacing: 1px;
}

.review-quote {
  font-size: 0.92rem;
  color: var(--text-soft);
  margin: 0;
  flex: 1;
}

.review-plan {
  font-size: 0.78rem;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Native HTML FAQ Accordion (<details> + <summary>)
   ========================================================================== */

.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: var(--border-glow);
}

.faq-item summary {
  list-style: none;
  padding: 18px 22px;
  font-weight: 700;
  font-size: 1.02rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--accent-cyan);
  line-height: 1;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  content: "−";
  color: var(--accent-mint);
}

.faq-answer {
  padding: 0 22px 18px;
  font-size: 0.94rem;
  color: var(--text-soft);
  border-top: 1px solid rgba(148, 163, 184, 0.08);
  padding-top: 14px;
}

/* ==========================================================================
   External Links Directory & Footer
   ========================================================================== */

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.links-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
}

.links-panel h3 {
  font-size: 1rem;
  color: var(--accent-cyan);
  margin-bottom: 14px;
}

.links-panel ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.links-panel a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-soft);
  padding: 6px 10px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.025);
}

.links-panel a:hover {
  background: rgba(140, 214, 252, 0.1);
  color: var(--accent-cyan);
}

.cta-banner {
  margin-top: 40px;
  background: linear-gradient(135deg, rgba(140, 214, 252, 0.14) 0%, rgba(186, 230, 253, 0.1) 100%);
  border: 1px solid rgba(140, 214, 252, 0.35);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  text-align: center;
}

.cta-banner h2 {
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
  margin-bottom: 10px;
}

.cta-banner p {
  color: var(--text-soft);
  max-width: 640px;
  margin: 0 auto 22px;
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: rgba(4, 7, 14, 0.88);
  padding: 40px 0 28px;
  margin-top: 40px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.82rem;
}

/* ==========================================================================
   Article Page Layout (posts/*.html)
   ========================================================================== */

.post-shell {
  padding: 40px 0 60px;
}

.post-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.post-hero {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  margin-bottom: 28px;
  backdrop-filter: blur(12px);
}

.post-hero h1 {
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  line-height: 1.28;
  margin-bottom: 14px;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.post-body {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 34px 28px;
  backdrop-filter: blur(12px);
}

.post-body h2 {
  font-size: 1.42rem;
  margin: 30px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--accent-cyan);
}

.post-body h2:first-child {
  margin-top: 0;
}

.post-body h3 {
  font-size: 1.12rem;
  margin: 22px 0 8px;
  color: var(--accent-mint);
}

.post-body p {
  color: var(--text-soft);
  margin-bottom: 16px;
  line-height: 1.82;
}

.post-body ul,
.post-body ol {
  margin: 0 0 18px 20px;
  color: var(--text-soft);
  list-style: disc;
}

.post-body ol {
  list-style: decimal;
}

.post-body li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.post-body a.inline-link {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-body a.inline-link:hover {
  color: var(--accent-mint);
}

.callout-box {
  background: var(--gradient-brand-soft);
  border-left: 4px solid var(--accent-mint);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 16px 18px;
  margin: 22px 0;
  color: var(--text-main);
}

.post-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 28px 0;
}

.post-nav a {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.post-nav a:hover {
  border-color: var(--border-glow);
}

.post-nav span {
  font-size: 0.78rem;
  color: var(--accent-cyan);
  font-weight: 700;
}

.post-nav strong {
  font-size: 0.95rem;
  color: var(--text-main);
}

.related-section {
  margin-top: 36px;
}

.related-section h2 {
  font-size: 1.35rem;
  margin-bottom: 18px;
}

@media (max-width: 639px) {
  .post-hero,
  .post-body {
    padding: 22px 18px;
  }
}