/* ============================================================
   SSC 2026 – Main Stylesheet
   Vidyasagar University Social Science Conclave
   Created by Partha Ghosh, officialparthaghosh@gmail.com, 2026
   ============================================================ */

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
  background-color: #F6F4ED;
  color: #1A1A1A;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Selection color */
::selection {
  background-color: rgba(197, 160, 89, 0.3);
}

/* ---- Scroll Progress Bar ---- */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, #C5A059, #591A26);
  transform-origin: left;
  transform: scaleX(0);
  z-index: 999;
  transition: transform 0.05s linear;
}

/* ---- Texture overlay ---- */
.bg-texture::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 998;
  opacity: 0.04;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.08'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* ---- Font helpers ---- */
.font-serif {
  font-family: 'Playfair Display', ui-serif, Georgia, serif;
}

.font-sans {
  font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
}

/* ---- Scroll-reveal animation ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Section fade delays */
.reveal[data-delay="1"] {
  transition-delay: 0.1s;
}

.reveal[data-delay="2"] {
  transition-delay: 0.2s;
}

.reveal[data-delay="3"] {
  transition-delay: 0.3s;
}

.reveal[data-delay="4"] {
  transition-delay: 0.4s;
}

.reveal[data-delay="5"] {
  transition-delay: 0.5s;
}

.reveal-left[data-delay="1"] {
  transition-delay: 0.1s;
}

.reveal-left[data-delay="2"] {
  transition-delay: 0.2s;
}

.reveal-left[data-delay="3"] {
  transition-delay: 0.3s;
}

.reveal-left[data-delay="4"] {
  transition-delay: 0.4s;
}

.reveal-left[data-delay="5"] {
  transition-delay: 0.5s;
}

/* ---- Animated blobs ---- */
@keyframes blobAnim1 {

  0%,
  100% {
    transform: scale(1) translate(0, 0);
    opacity: 0.2;
  }

  50% {
    transform: scale(1.2) translate(50px, -50px);
    opacity: 0.4;
  }
}

@keyframes blobAnim2 {

  0%,
  100% {
    transform: scale(1) translate(0, 0);
    opacity: 0.15;
  }

  50% {
    transform: scale(1.3) translate(-40px, 60px);
    opacity: 0.3;
  }
}

.blob1 {
  animation: blobAnim1 15s ease-in-out infinite;
}

.blob2 {
  animation: blobAnim2 20s ease-in-out 2s infinite;
}

/* ---- Mouse follower ---- */
#mouse-follower {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(223, 186, 107, 0.10) 0%, transparent 70%);
  pointer-events: none;
  transform: translate(-300px, -300px);
  transition: transform 2s ease-out;
  filter: blur(80px);
}

/* ---- Floating particles ---- */
@keyframes particleFloat {
  0% {
    opacity: 0;
    transform: translateY(0) translateX(0);
  }

  20% {
    opacity: 0.8;
  }

  100% {
    opacity: 0;
    transform: translateY(-200px) translateX(var(--dx));
  }
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  animation: particleFloat var(--dur) linear var(--delay) infinite;
}

/* ---- Grid pattern (hero) ---- */
.hero-grid {
  position: absolute;
  inset: 0;
  opacity: 0.05;
  background-image: linear-gradient(#fff 1px, transparent 1px),
    linear-gradient(90deg, #fff 1px, transparent 1px);
  background-size: 40px 40px;
}

/* ---- University Logo circles ---- */
/* Hero logo: white background, perfectly fitted */
.logo-circle-hero {
  background: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.40);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.logo-circle-hero img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 2px;
}

/* Navbar logo: white background */
.logo-circle-nav {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.logo-circle-nav img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 1px;
}

/* ---- Button ripple effect ---- */
.ripple-btn {
  position: relative;
  overflow: hidden;
}

.ripple-circle {
  position: absolute;
  width: 300%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  transform: scale(0) translate(-50%, -50%);
  transition: transform 0.8s ease-out;
  pointer-events: none;
  z-index: 0;
  will-change: transform;
  left: 50%;
  top: 50%;
}

/* ---- Spinning conic gradient border ---- */
@keyframes spinBorder {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.spin-border-wrapper {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  padding: 2px;
}

.spin-border-wrapper .spin-border {
  position: absolute;
  inset: -100%;
  opacity: 0;
  transition: opacity 0.4s;
  animation: spinBorder 3s linear infinite;
  z-index: 0;
}

.spin-border-wrapper:hover .spin-border {
  opacity: 1;
}

.spin-border-wrapper .inner-card {
  position: relative;
  z-index: 10;
  border-radius: 22px;
  width: 100%;
  height: 100%;
  background: white;
}

/* ---- Speaker card ---- */
.speaker-card .spin-border-round {
  position: absolute;
  inset: -50%;
  opacity: 0;
  transition: opacity 0.5s;
  animation: spinBorder 3s linear infinite;
  z-index: 0;
  background: conic-gradient(from 90deg at 50% 50%, transparent 0%, #800020 50%, transparent 100%);
}

.speaker-card:hover .spin-border-round {
  opacity: 1;
}

/* ---- Navbar ---- */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 997;
  transition: all 0.3s ease;
  padding: 1.25rem 0;
  border-bottom: 1px solid transparent;
}

#navbar.scrolled {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: #e5e7eb;
  padding: 0.75rem 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

#navbar-logo {
  transition: opacity 0.3s;
  opacity: 0;
  pointer-events: none;
}

#navbar.scrolled #navbar-logo {
  opacity: 1;
  pointer-events: auto;
}

.nav-link {
  position: relative;
  font-size: 1rem;
  font-weight: 500;
  color: #d1d5db;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: #381018;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease-out;
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link:hover {
  color: #C5A059;
}

#navbar.scrolled .nav-link {
  color: #4b5563;
}

#navbar.scrolled .nav-link:hover {
  color: #C5A059;
}

/* ---- Mobile menu ---- */
#mobile-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: white;
  border-bottom: 1px solid #e5e7eb;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  animation: fadeInUp 0.2s ease;
}

#mobile-menu.open {
  display: block;
}

/* ---- Interactive Glow Timeline ---- */
#timeline-interactive {
  padding: 4px 0 10px;
}

/* Compact rows — all 6 deadlines visible on one screen */
.tl-item {
  min-height: 52px;
  padding: 5px 0;
}

/* Node wrapper anchors the node to the vertical center */
.tl-node-wrap {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateY(-50%) translateX(-50%);
}

/* Default (resting) node */
.tl-node {
  width: 14px;
  height: 14px;
  background: #fff;
  border: 2px solid #d1d5db;
  border-radius: 50%;
  box-shadow: none;
  transition: width 0.35s cubic-bezier(0.34,1.56,0.64,1),
              height 0.35s cubic-bezier(0.34,1.56,0.64,1),
              border-color 0.3s ease,
              box-shadow 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tl-dot {
  width: 8px;
  height: 8px;
  background: #d1d5db;
  border-radius: 50%;
  transition: width 0.35s cubic-bezier(0.34,1.56,0.64,1),
              height 0.35s cubic-bezier(0.34,1.56,0.64,1),
              background 0.3s ease;
}

/* ACTIVE state — driven by JS when cursor is near */
.tl-item.tl-active .tl-node {
  width: 28px;
  height: 28px;
}

.tl-item.tl-active .tl-dot {
  width: 14px;
  height: 14px;
}

/* Active title glow */
.tl-item.tl-active .tl-title {
  font-size: 1.4rem;
  text-shadow: 0 0 18px var(--item-glow, rgba(200,200,200,0.6));
}

.tl-item.tl-active .tl-date {
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  filter: brightness(1.3);
}


/* ---- Contact card spinning border ---- */
.contact-card .spin-border-conic {
  position: absolute;
  inset: -100%;
  opacity: 0;
  transition: opacity 0.5s;
  animation: spinBorder 3s linear infinite;
  z-index: 0;
  background: conic-gradient(from 90deg at 50% 50%, transparent 0%, #d4af37 50%, transparent 100%);
}

.contact-card:hover .spin-border-conic {
  opacity: 1;
}

/* ---- Hover lift ---- */
.hover-lift {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

/* ---- Table row hover ---- */
tr.hover-row {
  transition: background-color 0.2s;
}

tr.hover-row:hover {
  background-color: #f9fafb;
}

/* ---- Abstract blob backgrounds for sections ---- */
@keyframes floatBlob {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  33% {
    transform: translate(100px, 50px) scale(1.1);
  }

  66% {
    transform: translate(-80px, -80px) scale(1.2);
  }
}

@keyframes floatBlob2 {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  33% {
    transform: translate(-80px, 100px) scale(1.2);
  }

  66% {
    transform: translate(50px, -50px) scale(0.9);
  }
}

.section-blob-1 {
  animation: floatBlob 20s ease-in-out infinite;
}

.section-blob-2 {
  animation: floatBlob2 25s ease-in-out infinite;
}

.section-blob-3 {
  animation: floatBlob 22s ease-in-out 3s infinite;
}

/* ---- Theme card morphing shapes ---- */
@keyframes morphShape {

  0%,
  100% {
    border-radius: 50% 30% 70% 40%;
    transform: rotate(0deg) translate(0, 0);
  }

  25% {
    border-radius: 30% 70% 40% 60%;
    transform: rotate(45deg) translate(20px, -10px);
  }

  50% {
    border-radius: 70% 30% 60% 40%;
    transform: rotate(90deg) translate(-15px, 20px);
  }

  75% {
    border-radius: 40% 60% 30% 70%;
    transform: rotate(135deg) translate(10px, 10px);
  }
}

.morph-shape {
  animation: morphShape 20s ease-in-out infinite;
}

/* ---- Misc utilities ---- */
.underline-gold {
  text-decoration: underline;
  text-decoration-color: rgba(197, 160, 89, 0.3);
  text-underline-offset: 4px;
}

/* ---- fadeInUp keyframe (used by mobile menu) ---- */
@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}