/* ==========================================================================
   MOBILE-FIRST PURE PAPER THEME & HIGH-CONTRAST SYSTEM
   ========================================================================== */
:root {
  --bg-page: #f8fafc;
  --card-bg: #ffffff;
  --border-crisp: #cbd5e1;
  --border-light: #e2e8f0;
  --text-heading: #0f172a;
  --text-subheading: #1e293b;
  --text-body: #334155;
  --accent-primary: #0284c7;
  --accent-secondary: #06b6d4;
}

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

html, body {
  max-width: 100%;
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-page);
  color: var(--text-body);
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

/* Requirement 3: Justified text without word hyphenation (no 'cover-ing') */
.text-justify {
  text-align: justify;
  text-justify: inter-word;
  -webkit-hyphens: none;
  -moz-hyphens: none;
  -ms-hyphens: none;
  hyphens: none;
  word-break: normal;
}

/* Ambient Crisp Blueprint Grid */
.paper-grid {
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(148, 163, 184, 0.32) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.8;
}

@media (min-width: 768px) {
  .paper-grid {
    background-size: 28px 28px;
    opacity: 0.85;
  }
}

.ambient-radial-glow {
  position: fixed;
  top: -150px;
  right: -100px;
  width: min(750px, 90vw);
  height: min(750px, 90vw);
  background: radial-gradient(circle, rgba(6, 182, 212, 0.08) 0%, rgba(2, 132, 199, 0.03) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.ambient-radial-glow-left {
  position: fixed;
  bottom: -150px;
  left: -100px;
  width: min(650px, 90vw);
  height: min(650px, 90vw);
  background: radial-gradient(circle, rgba(79, 70, 229, 0.06) 0%, rgba(6, 182, 212, 0.02) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* High-contrast Typography Gradients */
.gradient-heading {
  background: linear-gradient(135deg, #0f172a 0%, #0284c7 65%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-brand {
  background: linear-gradient(135deg, #0284c7 0%, #06b6d4 50%, #4f46e5 100%);
}

/* Responsive Typography Clamps */
.fluid-hero-title {
  font-size: clamp(1.85rem, 5.5vw, 3.25rem);
  line-height: 1.15;
}

.fluid-section-title {
  font-size: clamp(1.5rem, 3.8vw, 2.35rem);
  line-height: 1.22;
}

.fluid-card-title {
  font-size: clamp(1.12rem, 2.5vw, 1.4rem);
  line-height: 1.3;
}

/* Requirement 3: 1px Solid Border with Proper Color + Dynamic Hover Redesign */
.paper-card {
  background: #ffffff;
  border: 1px solid #cbd5e1; /* 1px solid crisp border */
  border-radius: 18px;
  box-shadow: 0 4px 16px -2px rgba(15, 23, 42, 0.05), 0 2px 4px -1px rgba(15, 23, 42, 0.03);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.3s ease,
              background-color 0.3s ease;
  position: relative;
  overflow: hidden;
  width: 100%;
  min-width: 0;
}

/* Dynamic Hover Transformation */
.paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #0284c7, #06b6d4, #4f46e5);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 5;
}

.paper-card:hover {
  transform: translateY(-6px);
  border-color: #0284c7;
  box-shadow: 0 20px 35px -8px rgba(2, 132, 199, 0.22), 0 6px 16px -4px rgba(15, 23, 42, 0.08);
}

.paper-card:hover::before {
  opacity: 1;
}

/* Badges & Tech Chips */
.tech-chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.28rem 0.6rem;
  border-radius: 8px;
  background: #f1f5f9;
  color: #1e293b;
  border: 1px solid #cbd5e1;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.2s ease;
  max-width: 100%;
  white-space: normal;
  word-break: break-word;
  line-height: 1.35;
}

.paper-card:hover .tech-chip {
  background: #ffffff;
  border-color: #94a3b8;
}

/* Dynamic Topbar Transitions */
#main-topbar {
  transition: height 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              background-color 0.3s ease,
              border-color 0.3s ease,
              box-shadow 0.3s ease;
}

#main-topbar.topbar-transparent {
  height: 76px;
  background-color: transparent;
  border-color: transparent;
  box-shadow: none;
}

@media (min-width: 1024px) {
  #main-topbar.topbar-transparent {
    height: 88px;
  }
}

#main-topbar.topbar-scrolled {
  height: 64px;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-color: #cbd5e1;
  box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.07);
}

@media (min-width: 1024px) {
  #main-topbar.topbar-scrolled {
    height: 70px;
  }
}

/* Unique Liquid Waves Preloader Animation */
#wave-preloader {
  position: fixed;
  inset: 0;
  background: #ffffff;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.4s ease;
  overflow: hidden;
  padding: 1rem;
}

#wave-preloader.preloader-fade {
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
  transition: opacity 0.4s ease-out, visibility 0.4s ease-out;
}

.wave-tank {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 200px;
  pointer-events: none;
}

@media (min-width: 768px) {
  .wave-tank {
    height: 240px;
  }
}

.wave-svg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 200%;
  height: 100%;
}

.wave-layer-1 {
  fill: rgba(6, 182, 212, 0.15);
  animation: waveFlow 10s linear infinite;
}

.wave-layer-2 {
  fill: rgba(2, 132, 199, 0.22);
  animation: waveFlowReverse 7s linear infinite;
}

.wave-layer-3 {
  fill: rgba(79, 70, 229, 0.14);
  animation: waveFlow 5s linear infinite;
}

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

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

/* Orbital Badge Pulse */
.preloader-avatar {
  position: relative;
  width: 76px;
  height: 76px;
  border-radius: 22px;
  background: linear-gradient(135deg, #0284c7 0%, #06b6d4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.85rem;
  font-weight: 800;
  box-shadow: 0 10px 30px rgba(2, 132, 199, 0.35);
  z-index: 10;
}

.preloader-orbit {
  position: absolute;
  inset: -12px;
  border-radius: 32px;
  border: 2px dashed rgba(6, 182, 212, 0.45);
  animation: spinOrbit 8s linear infinite;
}

@keyframes spinOrbit {
  to { transform: rotate(360deg); }
}

/* Scroll to Top with Circular Ring */
#scrollTopBtn {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 8px 24px -4px rgba(15, 23, 42, 0.15), 0 2px 6px -1px rgba(15, 23, 42, 0.08);
  border: 1px solid #cbd5e1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 70;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  touch-action: manipulation;
}

@media (min-width: 640px) {
  #scrollTopBtn {
    bottom: 2rem;
    right: 2rem;
    width: 52px;
    height: 52px;
  }
}

#scrollTopBtn.active,
#scrollTopBtn.show {
  opacity: 1 !important;
  visibility: visible !important;
  transform: translateY(0) !important;
  pointer-events: auto !important;
}

#scrollTopBtn:hover {
  transform: translateY(-3px);
  border-color: #0284c7;
  box-shadow: 0 14px 28px -4px rgba(2, 132, 199, 0.25);
}

.progress-ring-circle {
  transition: stroke-dashoffset 0.15s ease-out;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}

/* Smooth Scroll Fade Reveal (Progressive Enhancement - Text Visible by Default) */
.fade-reveal {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1), transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

/* Below-the-fold reveal animation when JavaScript observer is active */
.js-reveal-active .fade-reveal:not(.revealed) {
  opacity: 0;
  transform: translateY(18px);
}

.js-reveal-active .fade-reveal.revealed {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* Mobile-Safe Toast Banner */
#toast-banner {
  position: fixed;
  bottom: 1.25rem;
  left: 1rem;
  right: 1rem;
  background: #0f172a;
  color: #ffffff;
  padding: 0.8rem 1.15rem;
  border-radius: 14px;
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  box-shadow: 0 14px 35px -5px rgba(15, 23, 42, 0.35);
  z-index: 1000;
  opacity: 0;
  transform: translateY(15px);
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 26rem;
  margin: 0 auto;
}

@media (min-width: 640px) {
  #toast-banner {
    bottom: 2rem;
    left: 2rem;
    right: auto;
    margin: 0;
  }
}

#toast-banner.show {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile Drawer Navigation Styles */
#mobile-nav-drawer {
  transition: visibility 0.35s ease;
}

#mobile-nav-backdrop {
  transition: opacity 0.35s ease;
}

#mobile-nav-panel {
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: min(340px, 86vw);
}

#mobile-nav-drawer.open {
  visibility: visible;
}

#mobile-nav-drawer.open #mobile-nav-backdrop {
  opacity: 1;
  pointer-events: auto;
}

#mobile-nav-drawer.open #mobile-nav-panel {
  transform: translateX(0);
}

/* Requirement 5: Styled Technical Skills Table */
.skills-table-container {
  width: 100%;
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
  box-shadow: 0 4px 20px -4px rgba(15, 23, 42, 0.06);
}

.skills-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
}

.skills-table th {
  background-color: #f8fafc;
  color: #0f172a;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1.1rem 1.25rem;
  border-bottom: 2px solid #cbd5e1;
}

.skills-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #e2e8f0;
  color: #334155;
  font-size: 0.88rem;
  vertical-align: middle;
}

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

.skills-table tbody tr {
  transition: background-color 0.2s ease;
}

.skills-table tbody tr:hover {
  background-color: #f0f9ff;
}

.skills-table tbody tr:hover td:first-child {
  color: #0284c7;
}

/* Carousel Slides (Certifications & Publications) */
.cert-slide,
.pub-slide {
  flex-shrink: 0;
  box-sizing: border-box;
}

/* Lightbox Modal Media Container */
.lightbox-media-wrapper {
  max-height: 65vh;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f1f5f9;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  padding: 0.5rem;
}

.lightbox-media-wrapper img {
  max-width: 100%;
  height: auto;
  max-height: 60vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
}

.lightbox-media-wrapper iframe {
  width: 100%;
  height: 60vh;
  border: none;
  border-radius: 8px;
}

/* Accessibility Focus Rings */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid #0284c7;
  outline-offset: 2px;
}

/* Accessible Motion Query */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .fade-reveal {
    opacity: 1 !important;
    transform: none !important;
  }
  .wave-layer-1, .wave-layer-2, .wave-layer-3, .preloader-orbit {
    animation: none !important;
  }
}