/* ==========================================================================
   DESIGN VARIABLES & DESIGN SYSTEM (Theme: Academic & Creative Excellence)
   ========================================================================== */
:root {
  /* Font Families */
  --font-serif: 'Lora', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Theme: Warm Intellectual Light Mode (Default) */
  --bg-primary: hsl(30, 20%, 97%);
  --bg-secondary: hsl(0, 0%, 100%);
  --border-color: hsl(215, 20%, 90%);
  --text-primary: hsl(215, 45%, 15%);
  --text-muted: hsl(215, 15%, 45%);
  --accent-primary: hsl(215, 60%, 28%); /* Academic Deep Blue */
  --accent-secondary: hsl(38, 50%, 40%); /* Rich Gold */
  
  /* Shared Gradients & Decoratives */
  --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  --card-shadow: 0 4px 20px -2px rgba(44, 62, 80, 0.06), 0 2px 6px -1px rgba(44, 62, 80, 0.03);
  --card-shadow-hover: 0 20px 40px -4px rgba(44, 62, 80, 0.12), 0 8px 16px -2px rgba(44, 62, 80, 0.06);
  --header-bg: rgba(247, 245, 242, 0.8);
  --transition-speed: 0.4s;
  --border-radius: 12px;
  --border-radius-sm: 6px;
}

/* Theme: Sophisticated Dark Mode Toggle */
[data-theme="dark"] {
  --bg-primary: hsl(215, 28%, 8%);
  --bg-secondary: hsl(215, 28%, 12%);
  --border-color: hsl(215, 25%, 18%);
  --text-primary: hsl(210, 20%, 92%);
  --text-muted: hsl(215, 12%, 65%);
  --accent-primary: hsl(210, 85%, 70%); /* Luminous Soft Blue */
  --accent-secondary: hsl(38, 70%, 65%); /* Bright warm Gold */
  --card-shadow: 0 4px 30px -4px rgba(0, 0, 0, 0.3);
  --card-shadow-hover: 0 20px 50px -2px rgba(0, 0, 0, 0.5);
  --header-bg: rgba(13, 20, 30, 0.85);
}

/* ==========================================================================
   GLOBAL RESET & DEFAULTS
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* Typographic Legibility (As per retrieved web standards) */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-primary);
  text-wrap: balance; /* Prevents awkward line-breaks */
  margin-bottom: 0.5em;
  transition: color var(--transition-speed) ease;
}

p, li, blockquote, .about-text {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  color: var(--text-muted);
  text-wrap: pretty; /* Prevents orphaned words */
  transition: color var(--transition-speed) ease;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: all 0.3s ease;
}

/* ==========================================================================
   NAVIGATION BAR (Glassmorphism & Interactive)
   ========================================================================== */
.glass-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--header-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-speed) ease, border-bottom var(--transition-speed) ease, padding 0.3s ease;
  padding: 20px 0;
}

.glass-header.scrolled {
  padding: 12px 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.03);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.logo-link {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.logo-badge {
  font-size: 0.65rem;
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-secondary);
  margin-top: -2px;
}

.nav-menu {
  display: flex;
  gap: 30px;
}

.nav-item {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-muted);
  position: relative;
  padding: 5px 0;
}

.nav-item:hover {
  color: var(--text-primary);
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-secondary);
  transition: width 0.3s ease;
}

.nav-item:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.theme-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.theme-btn:hover {
  background-color: var(--bg-secondary);
  border-color: var(--accent-secondary);
  transform: rotate(15deg);
}

.cta-nav-btn {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--bg-secondary);
  background-color: var(--accent-primary);
  padding: 10px 20px;
  border-radius: 25px;
  border: 1px solid var(--accent-primary);
}

.cta-nav-btn:hover {
  background-color: transparent;
  color: var(--accent-primary);
  transform: translateY(-2px);
}

/* ==========================================================================
   HERO SECTION (Bold & Academic Hooks)
   ========================================================================== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 120px;
  position: relative;
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 50px;
  align-items: center;
}

.hero-content {
  z-index: 10;
}

.hero-eyebrow {
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-secondary);
  font-size: 0.85rem;
  margin-bottom: 15px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -1.5px;
  color: var(--text-primary);
  margin-bottom: 25px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 40px;
  max-width: 580px;
}

/* Stats Showcase */
.academic-stats {
  display: flex;
  gap: 30px;
  margin-bottom: 45px;
}

.stat-badge {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 15px 25px;
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 140px;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.stat-badge:hover {
  transform: translateY(-3px);
  border-color: var(--accent-secondary);
}

.stat-num {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.stat-lbl {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-top: 5px;
}

.hero-actions {
  display: flex;
  gap: 20px;
}

.primary-btn {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--bg-secondary);
  background-color: var(--accent-primary);
  padding: 15px 30px;
  border-radius: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  display: inline-block;
}

.primary-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  opacity: 0.95;
}

.secondary-btn {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 15px 30px;
  border-radius: 30px;
  display: inline-block;
}

.secondary-btn:hover {
  border-color: var(--accent-secondary);
  background-color: transparent;
  transform: translateY(-3px);
}

/* Background blob animation */
.hero-blob-wrapper {
  position: relative;
  width: 100%;
  height: 400px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-blob {
  width: 340px;
  height: 340px;
  position: absolute;
  border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
  filter: blur(32px);
  animation: blob-animate 16s infinite alternate ease-in-out;
  /* Claude Monet's Water Lilies (Nymphéas) deep impressionistic pond water palette */
  background: radial-gradient(circle at 20% 30%, hsl(172, 45%, 38%) 0%, transparent 60%), /* Deep emerald teal */
              radial-gradient(circle at 80% 20%, hsl(335, 55%, 82%) 0%, transparent 55%), /* Pastel rose reflection */
              radial-gradient(circle at 50% 80%, hsl(220, 38%, 42%) 0%, transparent 65%), /* Deep cobalt water shadow */
              radial-gradient(circle at 85% 75%, hsl(60, 42%, 65%) 0%, transparent 60%),  /* Golden sun reflection */
              radial-gradient(circle at 45% 25%, hsl(265, 30%, 50%) 0%, transparent 60%),  /* Lavender middle pool */
              linear-gradient(135deg, hsl(170, 35%, 45%) 0%, hsl(215, 30%, 38%) 100%);
  opacity: 0.92; /* Keep it nice and rich so the painting's colors pop! */
  transition: opacity var(--transition-speed) ease;
}

/* Smooth opacity adjustment of the parent blob wrapper when in dark mode */
[data-theme="dark"] .hero-blob {
  opacity: 0.26; /* Lower opacity in dark mode to fit Van Gogh's deep atmospheric night */
}

/* Double-surface overlay: Vincent van Gogh's "The Starry Night" deep canvas */
.hero-blob::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 30%, hsl(210, 85%, 20%), transparent 60%),
              radial-gradient(circle at 70% 70%, hsl(38, 70%, 15%), transparent 60%),
              linear-gradient(135deg, hsl(210, 85%, 70%) 0%, hsl(38, 70%, 65%) 100%);
  opacity: 0; /* Fully hidden in daylight/Monet mode */
  transition: opacity var(--transition-speed) ease;
  pointer-events: none;
}

/* Reveal Van Gogh's Starry Night canvas in Dark Mode */
[data-theme="dark"] .hero-blob::after {
  opacity: 1;
}

/* Starry Night SVG Celestial Canvas (Always visible, children groups handle theme) */
.starry-night-sky {
  position: absolute;
  width: 380px;
  height: 380px;
  z-index: 2;
  overflow: visible;
  pointer-events: none;
  opacity: 1;
  transition: mix-blend-mode var(--transition-speed) ease;
}

[data-theme="dark"] .starry-night-sky {
  mix-blend-mode: screen; /* Glowing screen blending for midnight/Van Gogh mode */
}

/* Astrolabe grid: visible in dark mode, de-emphasized in light mode for Monet's pond */
.celestial-grid {
  opacity: 0.04; /* Very faint in daylight mode to let Monet's pond speak for itself */
  transition: opacity var(--transition-speed) ease;
}

[data-theme="dark"] .celestial-grid {
  opacity: 0.22; /* Fully clear and luminous in starry night/midnight mode */
}

/* Monet Water Lilies Daylight Elements Group */
.monet-elements {
  opacity: 1;
  transition: opacity var(--transition-speed) ease;
}

[data-theme="dark"] .monet-elements {
  opacity: 0;
  pointer-events: none;
}

/* Weeping Willow Branch styling and sway animations */
.willow-left {
  transform: translate(30px, -5px) rotate(0deg);
  transform-origin: 30px 0px;
  animation: willow-sway-left 14s infinite alternate ease-in-out;
}

.willow-right {
  transform: translate(350px, -10px) scaleX(-1) rotate(0deg);
  transform-origin: 350px 0px;
  animation: willow-sway-right 16s infinite alternate ease-in-out;
}

@keyframes willow-sway-left {
  0% { transform: translate(30px, -5px) rotate(0deg); }
  100% { transform: translate(25px, -3px) rotate(4.5deg); }
}

@keyframes willow-sway-right {
  0% { transform: translate(350px, -10px) scaleX(-1) rotate(0deg); }
  100% { transform: translate(355px, -8px) scaleX(-1) rotate(-5.5deg); }
}

/* Van Gogh Starry Night Midnight Elements Group */
.van-gogh-elements {
  opacity: 0;
  transition: opacity var(--transition-speed) ease;
}

[data-theme="dark"] .van-gogh-elements {
  opacity: 1;
}

/* Monet Pond Drift Animations */
.pond-ripple {
  stroke-linecap: round;
  stroke-dasharray: 140;
  stroke-dashoffset: 140;
  animation: flow-ripples 22s infinite linear;
}

.pond-ripple-slow {
  stroke-linecap: round;
  stroke-dasharray: 90, 45;
  animation: flow-ripples-reverse 28s infinite linear;
}

@keyframes flow-ripples {
  to {
    stroke-dashoffset: -280;
  }
}

@keyframes flow-ripples-reverse {
  from {
    stroke-dashoffset: -140;
  }
  to {
    stroke-dashoffset: 280;
  }
}

/* Drifting Lily Pads + Flowers */
.drifting-pad {
  transform-origin: center;
}

.pad-drift-1 { animation: drift-1 14s infinite alternate ease-in-out; }
.pad-drift-2 { animation: drift-2 18s infinite alternate ease-in-out; }
.pad-drift-3 { animation: drift-3 12s infinite alternate ease-in-out; }
.pad-drift-4 { animation: drift-4 16s infinite alternate ease-in-out; }
.pad-drift-5 { animation: drift-5 13s infinite alternate ease-in-out; }

@keyframes drift-1 {
  0% { transform: translate(130px, 240px) translateY(0px) rotate(0deg); }
  100% { transform: translate(133px, 238px) translateY(-4px) rotate(4deg); }
}
@keyframes drift-2 {
  0% { transform: translate(250px, 170px) translateY(0px) rotate(0deg) scale(0.9); }
  100% { transform: translate(248px, 172px) translateY(4px) rotate(-5deg) scale(0.9); }
}
@keyframes drift-3 {
  0% { transform: translate(160px, 290px) translateY(0px) rotate(0deg) scale(0.7); }
  100% { transform: translate(163px, 288px) translateY(-3px) rotate(3deg) scale(0.7); }
}
@keyframes drift-4 {
  0% { transform: translate(280px, 260px) translateY(0px) rotate(0deg) scale(0.8); }
  100% { transform: translate(278px, 262px) translateY(3px) rotate(-3deg) scale(0.8); }
}
@keyframes drift-5 {
  0% { transform: translate(100px, 150px) translateY(0px) rotate(0deg) scale(0.6); }
  100% { transform: translate(101px, 148px) translateY(-2px) rotate(2deg) scale(0.6); }
}

@keyframes blob-animate {
  0% {
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    transform: rotate(0deg) scale(1);
  }
  50% {
    border-radius: 40% 60% 70% 30% / 50% 60% 30% 70%;
    transform: rotate(90deg) scale(1.15);
  }
  100% {
    border-radius: 70% 30% 40% 60% / 40% 70% 50% 30%;
    transform: rotate(180deg) scale(0.95);
  }
}

/* Layer 2: Astronomical Grid slow rotation */
.celestial-grid {
  transform-origin: 200px 200px;
  animation: spin-clockwise 200s infinite linear;
}

/* Layer 3: The Starry Night Sky Currents */
.sky-currents {
  opacity: 0.85;
}

.current-stroke-heavy {
  stroke-dasharray: 250;
  stroke-dashoffset: 250;
  animation: flow-currents 12s infinite linear;
}

.current-stroke-dashed {
  stroke-dasharray: 6, 10;
  stroke-dashoffset: 160;
  animation: flow-currents-reverse 18s infinite linear;
}

.current-stroke-loop {
  stroke-dasharray: 180;
  stroke-dashoffset: 180;
  animation: flow-currents 9s infinite linear;
}

.current-stroke-thin {
  stroke-dasharray: 120;
  stroke-dashoffset: 120;
  animation: flow-currents 14s infinite linear;
}

@keyframes flow-currents {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes flow-currents-reverse {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: 320;
  }
}

/* Layer 4: Concentric Star Halos */
.halo-star-group {
  transform-origin: 0 0; /* Star groups translated to their coordinates, so center is 0 0 locally */
}

/* Opposing spin keyframes for concentric halo rings */
.halo-ring-clockwise {
  transform-origin: 0 0;
  animation: spin-clockwise 25s infinite linear;
}

.halo-ring-counter {
  transform-origin: 0 0;
  animation: spin-counter-clockwise 18s infinite linear;
}

.star-core {
  transform-origin: 0 0;
  animation: star-pulse 2.5s infinite alternate ease-in-out;
}

/* Specific delays for individual stars to create organic complexity */
.star-a .star-core { animation-delay: 0.2s; }
.star-b .star-core { animation-delay: 0.8s; }
.star-c .star-core { animation-delay: 1.4s; }
.star-d .star-core { animation-delay: 0.5s; }

/* Layer 5: Crescent Moon */
.crescent-moon {
  transform-origin: 0 0;
}

.moon-shape {
  transform-origin: 0 0;
  animation: moon-glow 4s infinite alternate ease-in-out;
}

.moon-aura-pulse {
  transform-origin: 0 0;
  animation: moon-aura 6s infinite alternate ease-in-out;
}

@keyframes moon-glow {
  0% { transform: scale(0.96); opacity: 0.95; filter: drop-shadow(0 0 5px var(--accent-secondary)); }
  100% { transform: scale(1.04); opacity: 1; filter: drop-shadow(0 0 15px var(--accent-secondary)); }
}

@keyframes moon-aura {
  0% { transform: scale(0.85); opacity: 0.45; }
  100% { transform: scale(1.15); opacity: 0.7; }
}

/* Layer 6: Twinkling Stardust Field */
.dust-twinkle-fast {
  animation: twinkle 1.5s infinite ease-in-out alternate;
}

.dust-twinkle-medium {
  animation: twinkle 3s infinite ease-in-out alternate;
  animation-delay: 0.5s;
}

.dust-twinkle-slow {
  animation: twinkle 5s infinite ease-in-out alternate;
  animation-delay: 1.2s;
}

@keyframes twinkle {
  0% { opacity: 0.15; transform: scale(0.75); }
  50% { opacity: 0.55; }
  100% { opacity: 1; transform: scale(1.25); }
}

@keyframes star-pulse {
  0% { transform: scale(0.85); opacity: 0.75; }
  100% { transform: scale(1.15); opacity: 1; }
}

@keyframes spin-clockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes spin-counter-clockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0.7;
}

.scroll-mouse {
  width: 22px;
  height: 36px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}

.scroll-wheel {
  width: 4px;
  height: 8px;
  background-color: var(--accent-secondary);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll-wheel-anim 1.8s infinite ease-in-out;
}

@keyframes scroll-wheel-anim {
  0% { top: 6px; opacity: 1; }
  100% { top: 22px; opacity: 0; }
}

.scroll-text {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

/* ==========================================================================
   SECTION DEFAULTS & COMMON
   ========================================================================== */
section {
  padding: 100px 0;
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  margin-bottom: 60px;
  text-align: center;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  display: inline-block;
  margin-bottom: 10px;
}

.section-divider {
  width: 60px;
  height: 3.5px;
  background: var(--accent-gradient);
  margin: 0 auto;
  border-radius: 2px;
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 60px;
  align-items: center;
}

.about-image-wrapper {
  display: flex;
  justify-content: center;
}

.about-portrait-frame {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow-hover);
  aspect-ratio: 1;
  width: 100%;
  max-width: 420px;
}

.about-portrait {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  display: block;
}

.about-portrait-frame:hover .about-portrait {
  transform: scale(1.05);
}

.frame-border {
  position: absolute;
  top: 15px;
  left: 15px;
  right: 15px;
  bottom: 15px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  pointer-events: none;
  border-radius: calc(var(--border-radius) - 5px);
  z-index: 10;
  transition: all 0.4s ease;
}

.about-portrait-frame:hover .frame-border {
  top: 22px;
  left: 22px;
  right: 22px;
  bottom: 22px;
  border-color: var(--accent-secondary);
}

.about-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.about-heading {
  font-size: 2.2rem;
  font-family: var(--font-serif);
}

.about-text {
  font-size: 1.08rem;
  color: var(--text-muted);
}

.skills-showcase {
  margin-top: 15px;
  border-top: 1px solid var(--border-color);
  padding-top: 25px;
}

.skills-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-secondary);
  margin-bottom: 15px;
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 20px;
  transition: all 0.3s ease;
}

.skill-tag:hover {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  color: var(--bg-secondary);
  transform: translateY(-2px);
}

/* ==========================================================================
   PROJECTS SECTION & TABS FILTER
   ========================================================================== */
.project-filters {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.filter-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 10px 24px;
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.filter-btn:hover {
  border-color: var(--accent-secondary);
  color: var(--text-primary);
}

.filter-btn.active {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  color: var(--bg-secondary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 30px;
}

.project-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  opacity: 1;
  transform: scale(1);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.4s ease, opacity 0.4s ease;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--accent-secondary);
}

.project-img-container {
  position: relative;
  height: 200px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
}

/* Dynamic Art Placeholders using SVGs */
.project-art-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-card:hover .project-art-placeholder {
  transform: scale(1.05);
}

.reminder-bg {
  background: linear-gradient(135deg, hsl(38, 40%, 93%), hsl(38, 50%, 83%));
  color: hsl(38, 60%, 30%);
}
[data-theme="dark"] .reminder-bg {
  background: linear-gradient(135deg, hsl(38, 30%, 15%), hsl(38, 40%, 8%));
  color: hsl(38, 60%, 65%);
}

.parser-bg {
  background: linear-gradient(135deg, hsl(170, 30%, 93%), hsl(170, 40%, 82%));
  color: hsl(170, 50%, 28%);
}
[data-theme="dark"] .parser-bg {
  background: linear-gradient(135deg, hsl(170, 30%, 14%), hsl(170, 40%, 8%));
  color: hsl(170, 50%, 65%);
}

.robotics-bg {
  background: linear-gradient(135deg, hsl(210, 30%, 93%), hsl(210, 40%, 83%));
  color: hsl(210, 60%, 30%);
}
[data-theme="dark"] .robotics-bg {
  background: linear-gradient(135deg, hsl(210, 30%, 15%), hsl(210, 40%, 8%));
  color: hsl(210, 60%, 65%);
}

.mentorship-bg {
  background: linear-gradient(135deg, hsl(280, 25%, 94%), hsl(280, 35%, 83%));
  color: hsl(280, 45%, 32%);
}
[data-theme="dark"] .mentorship-bg {
  background: linear-gradient(135deg, hsl(280, 30%, 15%), hsl(280, 40%, 8%));
  color: hsl(280, 50%, 65%);
}

.project-svg-graphic {
  width: 80px;
  height: 80px;
  transition: transform 0.5s ease;
}

.project-card:hover .project-svg-graphic {
  transform: rotate(5deg) scale(1.1);
}

.project-tag {
  position: absolute;
  top: 15px;
  right: 15px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: 4px;
}

.project-details {
  padding: 25px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-award {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-secondary);
  background-color: hsla(38, 70%, 50%, 0.09);
  border: 1px solid hsla(38, 70%, 50%, 0.25);
  padding: 6px 14px;
  border-radius: 50px;
  width: fit-content;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 2px 8px hsla(38, 70%, 50%, 0.05);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] .project-award {
  background-color: hsla(38, 70%, 65%, 0.12);
  border-color: hsla(38, 70%, 65%, 0.35);
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.08);
}

.project-award:hover {
  transform: translateY(-1px) scale(1.02);
  box-shadow: 0 4px 12px hsla(38, 70%, 50%, 0.15);
  background-color: hsla(38, 70%, 50%, 0.15);
  border-color: hsla(38, 70%, 50%, 0.4);
}

.project-name {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-grow: 1;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-top: 1px solid var(--border-color);
  padding-top: 15px;
}

.project-tech-badge {
  font-size: 0.75rem;
  font-weight: 500;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 4px;
}

.live-link-badge {
  text-decoration: none;
  font-weight: 600;
  background-color: var(--bg-secondary);
  border: 1px solid var(--accent-secondary);
  color: var(--accent-secondary);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.live-link-badge:hover {
  background: var(--accent-gradient);
  color: var(--bg-secondary);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* ==========================================================================
   HONORS & LEADERSHIP TIMELINE
   ========================================================================== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  width: 2px;
  background-color: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 50px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: 11px;
  top: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 3px solid var(--accent-secondary);
  box-shadow: 0 0 0 4px var(--bg-primary);
  z-index: 10;
  transition: all 0.3s ease;
}

.timeline-item:hover .timeline-dot {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: scale(1.2);
}

.timeline-date {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--accent-secondary);
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.timeline-content {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 25px;
  box-shadow: var(--card-shadow);
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.timeline-item:hover .timeline-content {
  border-color: var(--accent-secondary);
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
}

.timeline-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 5px;
}

.timeline-subtitle {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-primary);
  margin-bottom: 12px;
}

.timeline-text {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-card-wrapper {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow-hover);
  overflow: hidden;
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
}

.contact-info-block {
  background: var(--accent-gradient);
  padding: 50px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--bg-secondary);
}

.contact-info-block h2 {
  color: var(--bg-secondary);
  font-size: 2.2rem;
  margin-bottom: 20px;
}

.contact-intro {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.05rem;
  margin-bottom: 40px;
}

.contact-meta {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 15px;
}

.meta-icon {
  font-size: 1.4rem;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.meta-link {
  color: var(--bg-secondary);
  font-weight: 500;
  border-bottom: 1px solid transparent;
}

.meta-link:hover {
  border-bottom-color: var(--bg-secondary);
}

.meta-text {
  font-weight: 500;
}

.contact-form-block {
  padding: 50px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
}

.form-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.form-input {
  width: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 12px 16px;
  border-radius: var(--border-radius-sm);
  outline: none;
  transition: border-color 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

.form-input::placeholder {
  color: var(--text-muted);
  opacity: 0.5;
}

.form-input:focus {
  border-color: var(--accent-secondary);
  background-color: var(--bg-secondary);
  box-shadow: 0 0 0 3px rgba(181, 150, 96, 0.1);
}

.form-input.text-area {
  min-height: 120px;
  resize: vertical;
}

.form-error {
  font-size: 0.75rem;
  font-weight: 500;
  color: hsl(0, 75%, 55%);
  margin-top: 4px;
  display: none;
}

.form-group.invalid .form-input {
  border-color: hsl(0, 75%, 55%);
}

.form-group.invalid .form-error {
  display: block;
}

.submit-btn {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--bg-secondary);
  background-color: var(--accent-primary);
  border: none;
  padding: 14px 30px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  align-self: flex-start;
}

.submit-btn:hover {
  opacity: 0.92;
  transform: translateY(-2px);
}

/* Success State */
.form-success-message {
  text-align: center;
  padding: 40px 0;
  animation: fade-in 0.5s ease;
}

.success-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: hsl(140, 20%, 90%);
  color: hsl(140, 45%, 35%);
  font-size: 1.8rem;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.success-title {
  font-size: 1.8rem;
  font-family: var(--font-serif);
  margin-bottom: 10px;
}

.success-desc {
  font-size: 1rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.main-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  transition: background-color var(--transition-speed) ease, border-top var(--transition-speed) ease;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 20px;
}

.footer-tagline {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  color: var(--accent-secondary);
}

/* ==========================================================================
   SCROLL REVEAL & INTRO FADES
   ========================================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: reveal-fade 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

@keyframes reveal-fade {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll Trigger reveals classes */
.scroll-reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   RESPONSIVENESS & ADAPTIVE STYLING
   ========================================================================== */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .hero-blob-wrapper {
    display: none; /* Hide visual blob on smaller sizes to maximize space */
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .academic-stats {
    justify-content: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .about-portrait-frame {
    max-width: 320px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-info-block {
    padding: 40px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none; /* Mobile menu collapsed for simplicity, scroll indicators take over */
  }

  .logo-text {
    font-size: 1.2rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .academic-stats {
    flex-direction: column;
    gap: 15px;
  }

  .timeline::before {
    left: 10px;
  }

  .timeline-item {
    padding-left: 35px;
  }

  .timeline-dot {
    left: 1px;
  }

  .contact-form-block {
    padding: 30px;
  }
  
  .submit-btn {
    align-self: stretch;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }
}