/* ==========================================================================
   CS Architecture Diagram — Intelligent Customer Service System
   Scoped under .cs-arch to avoid global pollution.
   Only loaded on case detail page when case.slug == 'cs'.
   ========================================================================== */

.cs-arch {
  --cs-grad-engine: linear-gradient(135deg, #7b5cff 0%, #ff72d2 50%, #3bd3ff 100%);
  --cs-grad-cyan:   linear-gradient(135deg, #3bd3ff, #7cffb2);
  --cs-grad-pink:   linear-gradient(135deg, #ff72d2, #7b5cff);
  --cs-grad-green:  linear-gradient(135deg, #7cffb2, #3bd3ff);
  --cs-text-dim:    rgba(231,233,238,0.55);
  --cs-border-soft: rgba(255,255,255,0.08);
  --cs-border-mid:  rgba(255,255,255,0.14);
  --cs-glass-1:     rgba(255,255,255,0.06);
  --cs-glass-2:     rgba(255,255,255,0.04);
  --cs-shadow-card: 0 8px 32px rgba(0,0,0,0.4);

  position: relative;
  margin: 56px 0;
  padding: 56px 36px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255,255,255,0.025), rgba(255,255,255,0.01));
  border: 1px solid var(--cs-border-soft);
  overflow: hidden;
  isolation: isolate;
}

[data-theme="light"] .cs-arch {
  --cs-text-dim:    rgba(26,28,35,0.45);
  --cs-border-soft: rgba(0,0,0,0.08);
  --cs-border-mid:  rgba(0,0,0,0.14);
  --cs-glass-1:     rgba(255,255,255,0.7);
  --cs-glass-2:     rgba(255,255,255,0.5);
  --cs-shadow-card: 0 8px 32px rgba(0,0,0,0.08);

  background: linear-gradient(180deg, rgba(248,249,251,1), rgba(255,255,255,1));
  border: 1px solid var(--cs-border-soft);
}

/* Decorative grid backdrop */
.cs-arch::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(900px 500px at 15% 0%, rgba(123,92,255,0.10), transparent 55%),
    radial-gradient(700px 400px at 85% 30%, rgba(59,211,255,0.08), transparent 55%),
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 90%);
  pointer-events: none;
  z-index: -1;
}

[data-theme="light"] .cs-arch::before {
  background-image:
    radial-gradient(900px 500px at 15% 0%, rgba(123,92,255,0.06), transparent 55%),
    radial-gradient(700px 400px at 85% 30%, rgba(59,211,255,0.05), transparent 55%),
    linear-gradient(rgba(0,0,0,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.025) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
}


/* ==========================================================================
   Diagram header
   ========================================================================== */
.cs-arch-header {
  text-align: center;
  margin-bottom: 48px;
}
.cs-arch-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border: 1px solid var(--cs-border-mid);
  border-radius: 999px;
  background: var(--cs-glass-1);
  backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  margin-bottom: 20px;
}
.cs-arch-eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent-2);
  box-shadow: 0 0 10px var(--color-accent-2);
  animation: cs-arch-pulse 2s ease-in-out infinite;
}
.cs-arch-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0 0 14px;
  color: var(--color-text);
}
.cs-arch-title .grad {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.cs-arch-subtitle {
  font-size: 14px;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}
.cs-arch-subtitle code {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 2px 8px;
  background: var(--cs-glass-1);
  border: 1px solid var(--cs-border-soft);
  border-radius: 4px;
  color: var(--color-text);
}


/* ==========================================================================
   Layer stack
   ========================================================================== */
.cs-arch-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cs-arch-layer {
  position: relative;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 28px;
  padding: 24px 28px;
  background: linear-gradient(180deg, var(--cs-glass-1), var(--cs-glass-2));
  border: 1px solid var(--cs-border-soft);
  border-radius: 18px;
  backdrop-filter: blur(10px);
  box-shadow: var(--cs-shadow-card);
  transition: transform 280ms cubic-bezier(0.4,0,0.2,1), border-color 280ms;
}
.cs-arch-layer:hover {
  transform: translateY(-3px);
  border-color: var(--cs-border-mid);
}
.cs-arch-layer + .cs-arch-layer { margin-top: 26px; }

/* Connector arrow between layers */
.cs-arch-layer + .cs-arch-layer::before {
  content: "";
  position: absolute;
  top: -28px;
  left: 84px;
  width: 2px;
  height: 28px;
  background: linear-gradient(180deg, transparent, var(--cs-border-mid));
}
.cs-arch-layer + .cs-arch-layer::after {
  content: "";
  position: absolute;
  top: -10px;
  left: 80px;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--color-primary-2);
  border-bottom: 2px solid var(--color-primary-2);
  transform: rotate(45deg);
  box-shadow: 0 0 8px rgba(59,211,255,0.5);
}


/* Layer side label */
.cs-arch-layer-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 4px;
}
.cs-arch-layer-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cs-text-dim);
  font-weight: 600;
}
.cs-arch-layer-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0;
}
.cs-arch-layer-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.5;
}


/* Layer body — components grid */
.cs-arch-layer-body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 12px;
  align-content: center;
}


/* ==========================================================================
   Component node card
   ========================================================================== */
.cs-arch-node {
  position: relative;
  padding: 14px 13px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--cs-border-soft);
  border-radius: 11px;
  transition: all 240ms cubic-bezier(0.4,0,0.2,1);
  min-height: 72px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}
[data-theme="light"] .cs-arch-node {
  background: rgba(255,255,255,0.7);
}
.cs-arch-node:hover {
  transform: translateY(-2px);
  border-color: var(--cs-border-mid);
  background: rgba(255,255,255,0.05);
}
[data-theme="light"] .cs-arch-node:hover {
  background: #fff;
}
.cs-arch-node-icon {
  width: 26px;
  height: 26px;
  margin-bottom: 4px;
  color: var(--color-primary-2);
}
.cs-arch-node-icon svg { width: 100%; height: 100%; }
.cs-arch-node-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}
.cs-arch-node-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--cs-text-dim);
  letter-spacing: 0.04em;
}


/* ==========================================================================
   Layer color variants
   ========================================================================== */
.cs-arch-layer.l-channel  .cs-arch-node-icon  { color: var(--color-primary-2); }
.cs-arch-layer.l-channel  .cs-arch-layer-num  { color: var(--color-primary-2); }

.cs-arch-layer.l-gateway  .cs-arch-node-icon  { color: var(--color-accent-2); }
.cs-arch-layer.l-gateway  .cs-arch-layer-num  { color: var(--color-accent-2); }

/* Engine — the star */
.cs-arch-layer.l-engine {
  background:
    radial-gradient(500px 180px at 50% 50%, rgba(123,92,255,0.16), transparent 70%),
    linear-gradient(180deg, rgba(123,92,255,0.08), rgba(59,211,255,0.04));
  border: 1px solid rgba(123,92,255,0.32);
  box-shadow:
    var(--cs-shadow-card),
    0 0 70px rgba(123,92,255,0.16),
    inset 0 1px 0 rgba(255,255,255,0.08);
}
.cs-arch-layer.l-engine::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 18px;
  padding: 1px;
  background: var(--cs-grad-engine);
  background-size: 200% 200%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
  opacity: 0.55;
  animation: cs-arch-borderShift 8s linear infinite;
  top: 0;
  left: 0;
  width: auto;
  height: auto;
}
.cs-arch-layer.l-engine::after { display: none; }
.cs-arch-layer.l-engine + .cs-arch-layer::before,
.cs-arch-layer + .cs-arch-layer.l-engine::before {
  /* keep connector arrow above engine */
}
.cs-arch-layer.l-engine .cs-arch-layer-num,
.cs-arch-layer.l-engine .cs-arch-layer-title {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.cs-arch-layer.l-engine .cs-arch-node {
  background: linear-gradient(180deg, rgba(123,92,255,0.10), rgba(123,92,255,0.04));
  border: 1px solid rgba(123,92,255,0.22);
}
.cs-arch-layer.l-engine .cs-arch-node:hover {
  border-color: rgba(123,92,255,0.55);
  box-shadow: 0 0 24px rgba(123,92,255,0.25);
}
.cs-arch-layer.l-engine .cs-arch-node-icon { color: var(--color-primary-1); }

.cs-arch-engine-badge {
  position: absolute;
  top: -10px;
  right: 22px;
  padding: 4px 12px;
  background: var(--gradient-brand);
  color: white;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  border-radius: 999px;
  box-shadow: 0 4px 16px rgba(123,92,255,0.4);
  z-index: 1;
}

.cs-arch-layer.l-data     .cs-arch-node-icon  { color: var(--color-primary-2); }
.cs-arch-layer.l-data     .cs-arch-layer-num  { color: var(--color-primary-2); }

.cs-arch-layer.l-collab   .cs-arch-node-icon  { color: var(--color-accent-1); }
.cs-arch-layer.l-collab   .cs-arch-layer-num  { color: var(--color-accent-1); }

.cs-arch-layer.l-business .cs-arch-node-icon  { color: var(--color-accent-2); }
.cs-arch-layer.l-business .cs-arch-layer-num  { color: var(--color-accent-2); }


/* ==========================================================================
   Feedback loop strip
   ========================================================================== */
.cs-arch-loop {
  margin-top: 48px;
  padding: 28px;
  background: linear-gradient(180deg, var(--cs-glass-1), var(--cs-glass-2));
  border: 1px solid var(--cs-border-soft);
  border-radius: 18px;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}
.cs-arch-loop::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent-2), transparent);
  animation: cs-arch-flow 4s linear infinite;
}
.cs-arch-loop-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}
.cs-arch-loop-icon {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--cs-grad-green);
  color: #0b0d12;
  flex-shrink: 0;
}
.cs-arch-loop-icon svg { width: 20px; height: 20px; }
.cs-arch-loop-title {
  font-size: 16px;
  font-weight: 700;
  margin: 0;
  color: var(--color-text);
}
.cs-arch-loop-sub {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 2px;
}
.cs-arch-loop-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 12px;
}
.cs-arch-loop-step {
  padding: 14px 12px;
  background: rgba(124,255,178,0.06);
  border: 1px solid rgba(124,255,178,0.18);
  border-radius: 10px;
  text-align: center;
}
[data-theme="light"] .cs-arch-loop-step {
  background: rgba(124,255,178,0.10);
}
.cs-arch-loop-step-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}
.cs-arch-loop-step-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-accent-2);
  letter-spacing: 0.04em;
}
[data-theme="light"] .cs-arch-loop-step-tag {
  color: #2db678;
}
.cs-arch-loop-arrow {
  color: var(--color-accent-2);
  font-size: 20px;
  line-height: 1;
  text-shadow: 0 0 8px rgba(124,255,178,0.5);
  animation: cs-arch-arrowPulse 2s ease-in-out infinite;
}


/* ==========================================================================
   Stats strip
   ========================================================================== */
.cs-arch-stats {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.cs-arch-stat {
  padding: 22px 18px;
  background: linear-gradient(180deg, var(--cs-glass-1), var(--cs-glass-2));
  border: 1px solid var(--cs-border-soft);
  border-radius: 14px;
  text-align: center;
  transition: all 280ms cubic-bezier(0.4,0,0.2,1);
}
.cs-arch-stat:hover {
  transform: translateY(-3px);
  border-color: var(--cs-border-mid);
}
.cs-arch-stat-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}
.cs-arch-stat-label {
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}


/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes cs-arch-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.6; transform: scale(1.3); }
}
@keyframes cs-arch-borderShift {
  0%   { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}
@keyframes cs-arch-arrowPulse {
  0%, 100% { transform: translateX(0); opacity: 0.7; }
  50%      { transform: translateX(3px); opacity: 1; }
}
@keyframes cs-arch-flow {
  0%   { left: -100%; }
  100% { left: 100%; }
}


/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 880px) {
  .cs-arch {
    margin: 40px 0;
    padding: 36px 20px;
    border-radius: 18px;
  }
  .cs-arch-header { margin-bottom: 36px; }
  .cs-arch-layer {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px 18px;
  }
  .cs-arch-layer + .cs-arch-layer::before { left: 50%; transform: translateX(-50%); }
  .cs-arch-layer + .cs-arch-layer::after { left: calc(50% - 4px); }
  .cs-arch-layer-body {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
  .cs-arch-loop-flow {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .cs-arch-loop-arrow {
    transform: rotate(90deg);
    justify-self: center;
  }
  .cs-arch-stats { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .cs-arch-stat-num { font-size: 22px; }
  .cs-arch-engine-badge { right: 14px; }
}
@media (max-width: 480px) {
  .cs-arch-layer-body {
    grid-template-columns: repeat(2, 1fr);
  }
}