/* ==========================================================================
   SIBACOM Electrical Circuits, PCB Traces & Animated Signal Flow System
   Jointly Organized by CSE Society & EE Society | Sukkur IBA University
   ========================================================================== */

:root {
  --sibacom-circuit-blue: #173F91;
  --sibacom-circuit-navy: #102E68;
  --sibacom-circuit-techgreen: #079B58;
  --sibacom-circuit-green-light: #0BB768;
  --sibacom-circuit-trace: rgba(23, 63, 145, 0.22);
  --sibacom-circuit-trace-light: rgba(23, 63, 145, 0.08);
  --sibacom-circuit-trace-dark: rgba(255, 255, 255, 0.12);
  --sibacom-circuit-trace-dark-glow: rgba(41, 98, 222, 0.28);
  --sibacom-circuit-pulse-color: #079B58;
  --sibacom-circuit-pulse-glow: rgba(7, 155, 88, 0.75);
  --sibacom-circuit-speed: 4s;
  --sibacom-circuit-glow: 8px;
  --sibacom-circuit-stroke: 1.5px;
}

/* ==========================================================================
   1. Base Circuit Containers & Global Properties
   ========================================================================== */

.sibacom-circuit,
.sibacom-circuit-overlay,
.sibacom-circuit-bg-layer,
.sibacom-circuit-corner,
.sibacom-circuit-connector,
.sibacom-timeline-signal {
  pointer-events: none !important;
  user-select: none !important;
}

/* Enhanced Circuit Pattern Background (Pattern E) */
.sibacom-circuit-background {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.sibacom-circuit-background svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Light Section Circuit Grid (Subtle PCB silkscreen + traces) */
.sibacom-circuit-pattern-light path,
.sibacom-circuit-pattern-light line {
  stroke: var(--sibacom-circuit-trace);
  stroke-width: var(--sibacom-circuit-stroke);
  fill: none;
}

.sibacom-circuit-pattern-light .trace-bus {
  stroke: rgba(23, 63, 145, 0.16);
  stroke-width: 1.5px;
}

.sibacom-circuit-pattern-light .trace-thin {
  stroke: rgba(23, 63, 145, 0.10);
  stroke-width: 1px;
}

.sibacom-circuit-pattern-light .circuit-pad {
  fill: #FFFFFF;
  stroke: var(--sibacom-circuit-blue);
  stroke-width: 1.5px;
}

.sibacom-circuit-pattern-light .circuit-via {
  fill: var(--sibacom-circuit-blue);
  opacity: 0.7;
}

.sibacom-circuit-pattern-light .circuit-via-green {
  fill: var(--sibacom-circuit-techgreen);
}

/* Dark Section Circuit Grid (Hero Dark / Footer) */
.sibacom-circuit-pattern-dark path,
.sibacom-circuit-pattern-dark line {
  stroke: var(--sibacom-circuit-trace-dark);
  stroke-width: var(--sibacom-circuit-stroke);
  fill: none;
}

.sibacom-circuit-pattern-dark .trace-bus {
  stroke: var(--sibacom-circuit-trace-dark-glow);
  stroke-width: 1.5px;
}

.sibacom-circuit-pattern-dark .trace-thin {
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 1px;
}

.sibacom-circuit-pattern-dark .circuit-pad {
  fill: #0B1938;
  stroke: #2962DE;
  stroke-width: 1.5px;
}

.sibacom-circuit-pattern-dark .circuit-via {
  fill: #2962DE;
  opacity: 0.8;
}

.sibacom-circuit-pattern-dark .circuit-via-green {
  fill: var(--sibacom-circuit-techgreen);
  filter: drop-shadow(0 0 4px rgba(7, 155, 88, 0.6));
}

/* ==========================================================================
   2. Pattern A – Flowing Signal Tracks & Animated Pulses
   ========================================================================== */

/* Animated Signal Pulse along SVG path */
.sibacom-signal-track {
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Animated Pulse moving along track using stroke-dasharray & stroke-dashoffset */
.sibacom-signal-pulse {
  stroke: var(--sibacom-circuit-pulse-color);
  stroke-linecap: round;
  fill: none;
  stroke-dasharray: 24 220;
  stroke-dashoffset: 244;
  animation: sibacomSignalRun var(--sibacom-circuit-speed) cubic-bezier(0.4, 0, 0.2, 1) infinite;
  filter: drop-shadow(0 0 5px var(--sibacom-circuit-pulse-glow));
  will-change: stroke-dashoffset;
}

/* Multi-speed Variations so tracks don't pulse mechanically in sync */
.sibacom-signal-pulse.speed-fast {
  animation-duration: 2.8s;
}

.sibacom-signal-pulse.speed-normal {
  animation-duration: 4.2s;
}

.sibacom-signal-pulse.speed-slow {
  animation-duration: 5.8s;
}

.sibacom-signal-pulse.speed-gentle {
  animation-duration: 7.2s;
}

/* Delayed start phases */
.sibacom-signal-pulse.delay-1 {
  animation-delay: 0.7s;
}

.sibacom-signal-pulse.delay-2 {
  animation-delay: 1.5s;
}

.sibacom-signal-pulse.delay-3 {
  animation-delay: 2.3s;
}

.sibacom-signal-pulse.delay-4 {
  animation-delay: 3.1s;
}

/* Reverse signal direction */
.sibacom-signal-pulse.reverse {
  animation-name: sibacomSignalRunReverse;
}

/* Alternative Pulse Bead (Moving dot via offset-path / translate) */
.sibacom-pulse-dot-moving {
  fill: var(--sibacom-circuit-pulse-color);
  filter: drop-shadow(0 0 6px var(--sibacom-circuit-pulse-glow));
}

/* ==========================================================================
   3. Pattern B – PCB Corner Pathways
   ========================================================================== */

.sibacom-card-circuit {
  position: relative;
  overflow: hidden;
}

/* PCB Corner Brackets on Cards */
.sibacom-circuit-corner {
  position: absolute;
  width: 48px;
  height: 48px;
  z-index: 2;
  opacity: 0.65;
  transition: opacity 0.35s ease, filter 0.35s ease;
}

.sibacom-card-circuit:hover .sibacom-circuit-corner {
  opacity: 1;
  filter: drop-shadow(0 0 4px rgba(7, 155, 88, 0.45));
}

.sibacom-circuit-corner.corner-tl {
  top: 6px;
  left: 6px;
}

.sibacom-circuit-corner.corner-tr {
  top: 6px;
  right: 6px;
}

.sibacom-circuit-corner.corner-bl {
  bottom: 6px;
  left: 6px;
}

.sibacom-circuit-corner.corner-br {
  bottom: 6px;
  right: 6px;
}

.sibacom-circuit-corner svg {
  width: 100%;
  height: 100%;
  display: block;
}

.sibacom-circuit-corner .corner-line {
  stroke: var(--sibacom-circuit-trace);
  stroke-width: 1.5px;
  fill: none;
  transition: stroke 0.3s ease;
}

.sibacom-circuit-corner .corner-via {
  fill: var(--sibacom-circuit-blue);
  transition: fill 0.3s ease, transform 0.3s ease;
}

.sibacom-card-circuit:hover .sibacom-circuit-corner .corner-line {
  stroke: var(--sibacom-circuit-techgreen);
}

.sibacom-card-circuit:hover .sibacom-circuit-corner .corner-via {
  fill: var(--sibacom-circuit-techgreen);
  transform: scale(1.15);
}

/* Card Perimeter Signal Racer on Hover */
.sibacom-card-circuit::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--sibacom-circuit-techgreen) 50%, transparent 100%);
  opacity: 0;
  transform: translateX(-100%);
  transition: opacity 0.25s ease;
  z-index: 3;
}

.sibacom-card-circuit:hover::before {
  opacity: 1;
  animation: sibacomCardTopScan 1.6s ease-in-out infinite;
}

/* ==========================================================================
   4. Pattern C – Connected Signal Nodes & Sequential Illumination
   ========================================================================== */

.sibacom-circuit-node {
  transform-origin: center;
  transition: all 0.3s ease;
}

.sibacom-circuit-node.node-pulse-1 {
  animation: sibacomNodeBlink 4.2s ease-in-out infinite;
  animation-delay: 0.3s;
}

.sibacom-circuit-node.node-pulse-2 {
  animation: sibacomNodeBlink 4.2s ease-in-out infinite;
  animation-delay: 1.4s;
}

.sibacom-circuit-node.node-pulse-3 {
  animation: sibacomNodeBlink 4.2s ease-in-out infinite;
  animation-delay: 2.5s;
}

.sibacom-circuit-node.node-pulse-4 {
  animation: sibacomNodeBlink 4.2s ease-in-out infinite;
  animation-delay: 3.6s;
}

/* Solder Pad with Annular Ring */
.sibacom-solder-pad {
  fill: #FFFFFF;
  stroke: var(--sibacom-circuit-blue);
  stroke-width: 1.5px;
}

.sibacom-solder-core {
  fill: var(--sibacom-circuit-techgreen);
  opacity: 0.8;
}

/* ==========================================================================
   5. Pattern D – Electrical Pulse Timeline (Schedule Section)
   ========================================================================== */

/* Enhanced Schedule Timeline with PCB Bus Spine */
.sibacom-timeline {
  position: relative;
  overflow: visible;
}

/* Dual-line PCB bus spine */
.sibacom-timeline.layout-left::before,
.sibacom-timeline:not(.layout-alternating)::before,
.sibacom-timeline-line {
  background: linear-gradient(180deg, 
    rgba(23, 63, 145, 0.3) 0%, 
    rgba(23, 63, 145, 0.7) 20%, 
    rgba(7, 155, 88, 0.7) 80%, 
    rgba(7, 155, 88, 0.3) 100%
  ) !important;
  width: 3px !important;
  box-shadow: 0 0 6px rgba(23, 63, 145, 0.2);
}

/* Traveling Electric Pulse along the Timeline Spine */
.sibacom-timeline-signal-pulse {
  position: absolute;
  top: 1.5rem;
  bottom: 1.5rem;
  left: var(--timeline-spine-x, 21px);
  transform: translateX(-50%);
  width: 7px;
  pointer-events: none;
  z-index: 2;
  overflow: hidden;
}

.sibacom-timeline-signal-pulse::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 120px;
  background: linear-gradient(180deg, 
    transparent 0%, 
    rgba(7, 155, 88, 0.2) 20%, 
    var(--sibacom-circuit-green-light) 60%, 
    #FFFFFF 85%, 
    var(--sibacom-circuit-green-light) 100%
  );
  border-radius: 4px;
  box-shadow: 0 0 12px var(--sibacom-circuit-green-light), 0 0 20px rgba(7, 155, 88, 0.6);
  opacity: 0;
  animation: sibacomTimelineTravel 5.5s cubic-bezier(0.45, 0, 0.55, 1) infinite;
  will-change: transform, opacity;
}

/* Timeline Node Electric Glow Enhancement */
.sibacom-timeline-node .sibacom-node-inner {
  position: relative;
}

.sibacom-timeline-node .sibacom-node-inner::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1.5px solid var(--sibacom-circuit-techgreen);
  opacity: 0;
  transform: scale(0.85);
  transition: all 0.3s ease;
  pointer-events: none;
}

.sibacom-timeline-item:hover .sibacom-timeline-node .sibacom-node-inner::after {
  opacity: 1;
  transform: scale(1.15);
  box-shadow: 0 0 10px rgba(7, 155, 88, 0.5);
}

/* Timeline Horizontal Branching Trace from Spine to Card */
.sibacom-timeline-item::before {
  content: '';
  position: absolute;
  left: calc(var(--timeline-spine-x, 21px) - var(--timeline-padding-left, 3.75rem));
  top: 2.25rem;
  width: 2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--sibacom-circuit-trace) 0%, rgba(23, 63, 145, 0.35) 100%);
  z-index: 1;
  pointer-events: none;
}

.sibacom-timeline-item:hover::before {
  background: linear-gradient(90deg, var(--sibacom-circuit-techgreen) 0%, var(--sibacom-circuit-green-light) 100%);
  box-shadow: 0 0 6px rgba(7, 155, 88, 0.4);
}

/* ==========================================================================
   6. Section-Specific Circuit Treatments
   ========================================================================== */

/* --- HERO SECTION CIRCUITS --- */
.sibacom-hero-circuit-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.sibacom-hero-circuit-left {
  position: absolute;
  top: 5%;
  left: 0;
  width: min(340px, 28vw);
  height: 90%;
  opacity: 0.85;
}

.sibacom-hero-circuit-right {
  position: absolute;
  top: 5%;
  right: 0;
  width: min(340px, 28vw);
  height: 90%;
  opacity: 0.85;
}

/* Digital Bus Connector in Hero Bottom */
.sibacom-hero-bus-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 36px;
  opacity: 0.6;
}

/* --- ORGANIZERS & ACADEMIC PARTNERS CIRCUIT CONNECTOR --- */
.sibacom-circuit-connector {
  position: relative;
  width: 100%;
  max-width: 680px;
  margin: 2.5rem auto 2.5rem auto;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.sibacom-circuit-connector svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* Central Bridge Chip in Connector */
.sibacom-connector-chip {
  fill: #FFFFFF;
  stroke: var(--sibacom-circuit-blue);
  stroke-width: 1.5px;
}

.sibacom-connector-chip-core {
  fill: var(--sibacom-circuit-techgreen);
  opacity: 0.9;
}

/* --- FOOTER CIRCUIT BACKGROUND --- */
.sibacom-footer {
  position: relative;
  overflow: hidden;
}

.sibacom-footer-circuit-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.45;
  pointer-events: none;
}

.sibacom-footer-circuit-bg svg {
  width: 100%;
  height: 100%;
  display: block;
}

.sibacom-footer > .sibacom-container {
  position: relative;
  z-index: 1;
}

/* --- SPEAKERS & GUESTS CARD ACCENTS --- */
.sibacom-speaker-card,
.sibacom-guest-card {
  position: relative;
}

/* Restrained PCB trace along speaker card header */
.sibacom-card-tech-header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.5rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px dashed var(--sibacom-circuit-trace);
}

.sibacom-card-tech-id {
  font-family: monospace;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--sibacom-circuit-techgreen);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.sibacom-card-tech-id::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--sibacom-circuit-techgreen);
  box-shadow: 0 0 5px var(--sibacom-circuit-techgreen);
}

/* ==========================================================================
   7. CSS Keyframe Animations
   ========================================================================== */

/* Main SVG Path Pulse Animation */
@keyframes sibacomSignalRun {
  0% {
    stroke-dashoffset: 244;
  }
  100% {
    stroke-dashoffset: 0;
  }
}

@keyframes sibacomSignalRunReverse {
  0% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: 244;
  }
}

/* Node Blink / Activation when Signal Arrives */
@keyframes sibacomNodeBlink {
  0%, 82%, 100% {
    transform: scale(1);
    opacity: 0.5;
    filter: drop-shadow(0 0 0 transparent);
  }
  90% {
    transform: scale(1.4);
    opacity: 1;
    fill: var(--sibacom-circuit-green-light);
    filter: drop-shadow(0 0 6px var(--sibacom-circuit-pulse-glow));
  }
  95% {
    transform: scale(1.15);
    opacity: 0.85;
  }
}

/* Vertical Timeline Pulse Travel */
@keyframes sibacomTimelineTravel {
  0% {
    top: 0;
    opacity: 0;
    transform: translateY(0);
  }
  4% {
    opacity: 1;
  }
  92% {
    opacity: 1;
  }
  100% {
    top: calc(100% - 120px);
    opacity: 0;
    transform: translateY(20px);
  }
}

/* Card Top Border Scan */
@keyframes sibacomCardTopScan {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* Solder Pad Subtle Breath */
@keyframes sibacomPadBreath {
  0%, 100% {
    opacity: 0.7;
    filter: drop-shadow(0 0 2px rgba(23, 63, 145, 0.3));
  }
  50% {
    opacity: 1;
    filter: drop-shadow(0 0 6px rgba(7, 155, 88, 0.5));
  }
}

/* ==========================================================================
   8. Responsive & Adaptive Rules
   ========================================================================== */

/* Tablet Viewport (max-width: 991px) */
@media (max-width: 991px) {
  .sibacom-hero-circuit-left,
  .sibacom-hero-circuit-right {
    width: 220px;
    opacity: 0.65;
  }

  .sibacom-circuit-corner {
    width: 36px;
    height: 36px;
  }

  .sibacom-timeline-signal-pulse {
    width: 5px;
  }
}

/* Mobile Viewport (max-width: 767px) */
@media (max-width: 767px) {
  /* Prevent any horizontal overflow */
  .sibacom-circuit,
  .sibacom-hero-circuit-overlay,
  .sibacom-circuit-background {
    max-width: 100vw;
    overflow: hidden;
  }

  /* Simplify hero circuits on mobile to prevent cluttering title */
  .sibacom-hero-circuit-left {
    width: 140px;
    left: -30px;
    opacity: 0.45;
  }

  .sibacom-hero-circuit-right {
    width: 140px;
    right: -30px;
    opacity: 0.45;
  }

  /* Smaller corner brackets */
  .sibacom-circuit-corner {
    width: 28px;
    height: 28px;
  }

  .sibacom-circuit-corner.corner-tr,
  .sibacom-circuit-corner.corner-bl {
    display: none; /* Keep only TL and BR on mobile for cleaner card layout */
  }

  /* Compact timeline pulse */
  .sibacom-timeline-signal-pulse::after {
    height: 80px;
  }

  .sibacom-circuit-connector {
    max-width: 340px;
    height: 36px;
    margin: 1.5rem auto;
  }
}

/* Extra Small Mobile (max-width: 480px) */
@media (max-width: 480px) {
  .sibacom-hero-circuit-left,
  .sibacom-hero-circuit-right {
    width: 110px;
    opacity: 0.35;
  }

  .sibacom-circuit-corner {
    width: 22px;
    height: 22px;
  }
}

/* ==========================================================================
   9. Accessibility: Reduced Motion Support
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .sibacom-signal-pulse,
  .sibacom-timeline-signal-pulse::after,
  .sibacom-card-circuit:hover::before,
  .sibacom-circuit-node.node-pulse-1,
  .sibacom-circuit-node.node-pulse-2,
  .sibacom-circuit-node.node-pulse-3,
  .sibacom-circuit-node.node-pulse-4 {
    animation: none !important;
    transition: none !important;
    stroke-dashoffset: 0 !important;
  }

  /* Keep circuit traces visible as static architectural graphics */
  .sibacom-signal-pulse {
    stroke-dasharray: none !important;
    opacity: 0.4 !important;
  }

  .sibacom-timeline-signal-pulse::after {
    display: none !important;
  }
}