/* ==========================================================================
   Design System & Premium Theme Variables
   ========================================================================== */
:root {
  /* Harmonious Light Palette (Optimized for Developers) */
  --bg-darker: hsl(220, 20%, 97%); /* Soft off-white code editor background */
  --bg-dark: hsl(220, 20%, 94%);
  --bg-panel: rgba(255, 255, 255, 0.7);
  --bg-panel-hover: rgba(255, 255, 255, 0.9);
  --border-light: rgba(15, 23, 42, 0.08); /* Code editor border style */
  --border-glow: rgba(79, 70, 229, 0.15);
  --bg-header: rgba(248, 250, 252, 0.85);

  /* Controls & Inputs */
  --bg-control: rgba(15, 23, 42, 0.04);
  --bg-control-hover: rgba(15, 23, 42, 0.08);
  --border-control-hover: rgba(15, 23, 42, 0.15);
  --bg-input: rgba(255, 255, 255, 0.85);

  /* Primary Light Mode Text */
  --text-light: #0f172a; /* Slate 900 for premium readability */
  --text-muted: #475569; /* Slate 600 */
  
  /* Vibrant Accent Gradients */
  --accent-cyan: #0284c7; /* Sky 600 - High contrast blue */
  --accent-indigo: #4f46e5; /* Indigo 600 */
  --accent-purple: #9333ea; /* Purple 600 */
  
  --gradient-primary: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-indigo) 100%);
  --gradient-purple: linear-gradient(135deg, var(--accent-indigo) 0%, var(--accent-purple) 100%);
  --gradient-text: linear-gradient(90deg, #0284c7 0%, #4f46e5 50%, #9333ea 100%);
  --hero-title-gradient: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  
  /* Project Tag Colors */
  --bg-tag-sys: rgba(147, 51, 234, 0.08);
  --border-tag-sys: rgba(147, 51, 234, 0.15);
  --color-tag-sys: #6b21a8;
  
  --bg-tag-web: rgba(2, 132, 199, 0.08);
  --border-tag-web: rgba(2, 132, 199, 0.15);
  --color-tag-web: #0369a1;

  --bg-tag-other: rgba(79, 70, 229, 0.08);
  --border-tag-other: rgba(79, 70, 229, 0.15);
  --color-tag-other: #4338ca;

  /* Shadows & Luminous Effects */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 40px rgba(15, 23, 42, 0.12);
  --neon-glow-cyan: 0 0 20px rgba(2, 132, 199, 0.12);
  --neon-glow-indigo: 0 0 20px rgba(79, 70, 229, 0.15);
  --glow-orb-opacity: 0.05;
  
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', var(--font-sans);
  --font-mono: 'Fira Code', 'Courier New', monospace;

  /* Layout */
  --container-width: 1200px;
  --header-height: 80px;
}

/* System prefers dark (Automatic fallback) */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-darker: hsl(240, 16%, 3%);
    --bg-dark: hsl(240, 15%, 5%);
    --bg-panel: rgba(13, 13, 23, 0.55);
    --bg-panel-hover: rgba(22, 22, 40, 0.7);
    --border-light: rgba(255, 255, 255, 0.05);
    --border-glow: rgba(99, 102, 241, 0.2);
    --bg-header: rgba(7, 7, 10, 0.7);

    /* Controls & Inputs */
    --bg-control: rgba(255, 255, 255, 0.05);
    --bg-control-hover: rgba(255, 255, 255, 0.1);
    --border-control-hover: rgba(255, 255, 255, 0.2);
    --bg-input: rgba(0, 0, 0, 0.2);

    /* Primary Dark Text */
    --text-light: #f8fafc;
    --text-muted: #94a3b8;
    
    /* Vibrant Accent Gradients */
    --accent-cyan: #06b6d4;
    --accent-indigo: #6366f1;
    --accent-purple: #a855f7;
    
    --gradient-primary: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-indigo) 100%);
    --gradient-purple: linear-gradient(135deg, var(--accent-indigo) 0%, var(--accent-purple) 100%);
    --gradient-text: linear-gradient(90deg, #06b6d4 0%, #6366f1 50%, #a855f7 100%);
    --hero-title-gradient: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
    
    /* Project Tag Colors */
    --bg-tag-sys: rgba(168, 85, 247, 0.1);
    --border-tag-sys: rgba(168, 85, 247, 0.2);
    --color-tag-sys: #d8b4fe;
    
    --bg-tag-web: rgba(6, 182, 212, 0.1);
    --border-tag-web: rgba(6, 182, 212, 0.2);
    --color-tag-web: #a5f3fc;

    --bg-tag-other: rgba(99, 102, 241, 0.1);
    --border-tag-other: rgba(99, 102, 241, 0.2);
    --color-tag-other: #c7d2fe;

    /* Shadows & Luminous Effects */
    --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 8px 30px -10px rgba(0, 0, 0, 0.7);
    --shadow-lg: 0 16px 40px -15px rgba(0, 0, 0, 0.8);
    --neon-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.2);
    --neon-glow-indigo: 0 0 20px rgba(99, 102, 241, 0.25);
    --glow-orb-opacity: 0.12;
  }
}

/* Explicit Light Theme Override (Highest specificity) */
html[data-theme="light"] {
  --bg-darker: hsl(220, 20%, 97%);
  --bg-dark: hsl(220, 20%, 94%);
  --bg-panel: rgba(255, 255, 255, 0.7);
  --bg-panel-hover: rgba(255, 255, 255, 0.9);
  --border-light: rgba(15, 23, 42, 0.08);
  --border-glow: rgba(79, 70, 229, 0.15);
  --bg-header: rgba(248, 250, 252, 0.85);

  --bg-control: rgba(15, 23, 42, 0.04);
  --bg-control-hover: rgba(15, 23, 42, 0.08);
  --border-control-hover: rgba(15, 23, 42, 0.15);
  --bg-input: rgba(255, 255, 255, 0.85);

  --text-light: #0f172a;
  --text-muted: #475569;
  
  --accent-cyan: #0284c7;
  --accent-indigo: #4f46e5;
  --accent-purple: #9333ea;
  
  --gradient-primary: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-indigo) 100%);
  --gradient-purple: linear-gradient(135deg, var(--accent-indigo) 0%, var(--accent-purple) 100%);
  --gradient-text: linear-gradient(90deg, #0284c7 0%, #4f46e5 50%, #9333ea 100%);
  --hero-title-gradient: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  
  --bg-tag-sys: rgba(147, 51, 234, 0.08);
  --border-tag-sys: rgba(147, 51, 234, 0.15);
  --color-tag-sys: #6b21a8;
  
  --bg-tag-web: rgba(2, 132, 199, 0.08);
  --border-tag-web: rgba(2, 132, 199, 0.15);
  --color-tag-web: #0369a1;

  --bg-tag-other: rgba(79, 70, 229, 0.08);
  --border-tag-other: rgba(79, 70, 229, 0.15);
  --color-tag-other: #4338ca;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 40px rgba(15, 23, 42, 0.12);
  --neon-glow-cyan: 0 0 20px rgba(2, 132, 199, 0.12);
  --neon-glow-indigo: 0 0 20px rgba(79, 70, 229, 0.15);
  --glow-orb-opacity: 0.05;
}

/* Explicit Dark Theme Override (Highest specificity) */
html[data-theme="dark"] {
  --bg-darker: hsl(240, 16%, 3%);
  --bg-dark: hsl(240, 15%, 5%);
  --bg-panel: rgba(13, 13, 23, 0.55);
  --bg-panel-hover: rgba(22, 22, 40, 0.7);
  --border-light: rgba(255, 255, 255, 0.05);
  --border-glow: rgba(99, 102, 241, 0.2);
  --bg-header: rgba(7, 7, 10, 0.7);

  --bg-control: rgba(255, 255, 255, 0.05);
  --bg-control-hover: rgba(255, 255, 255, 0.1);
  --border-control-hover: rgba(255, 255, 255, 0.2);
  --bg-input: rgba(0, 0, 0, 0.2);

  --text-light: #f8fafc;
  --text-muted: #94a3b8;
  
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  
  --gradient-primary: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-indigo) 100%);
  --gradient-purple: linear-gradient(135deg, var(--accent-indigo) 0%, var(--accent-purple) 100%);
  --gradient-text: linear-gradient(90deg, #06b6d4 0%, #6366f1 50%, #a855f7 100%);
  --hero-title-gradient: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
  
  --bg-tag-sys: rgba(168, 85, 247, 0.1);
  --border-tag-sys: rgba(168, 85, 247, 0.2);
  --color-tag-sys: #d8b4fe;
  
  --bg-tag-web: rgba(6, 182, 212, 0.1);
  --border-tag-web: rgba(6, 182, 212, 0.2);
  --color-tag-web: #a5f3fc;

  --bg-tag-other: rgba(99, 102, 241, 0.1);
  --border-tag-other: rgba(99, 102, 241, 0.2);
  --color-tag-other: #c7d2fe;

  --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 30px -10px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 16px 40px -15px rgba(0, 0, 0, 0.8);
  --neon-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.2);
  --neon-glow-indigo: 0 0 20px rgba(99, 102, 241, 0.25);
  --glow-orb-opacity: 0.12;
}

/* ==========================================================================
   Resets & Base Styles
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-darker);
  color: var(--text-light);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-light);
}

p {
  color: var(--text-muted);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.3s ease;
}

li {
  list-style: none;
}

input, textarea, button {
  font-family: inherit;
  color: inherit;
  background: transparent;
  border: none;
  outline: none;
}

/* ==========================================================================
   Background Orbs (Luminous Depth)
   ========================================================================== */
.glow-orb {
  position: absolute;
  width: 40vw;
  height: 40vw;
  max-width: 600px;
  max-height: 600px;
  border-radius: 50%;
  filter: blur(140px);
  opacity: var(--glow-orb-opacity);
  z-index: -1;
  pointer-events: none;
  will-change: transform;
}

.glow-1 {
  top: 10%;
  left: -10%;
  background: radial-gradient(circle, var(--accent-cyan) 0%, transparent 70%);
}

.glow-2 {
  top: 40%;
  right: -10%;
  background: radial-gradient(circle, var(--accent-indigo) 0%, transparent 70%);
}

.glow-3 {
  bottom: 10%;
  left: 20%;
  background: radial-gradient(circle, var(--accent-purple) 0%, transparent 70%);
}

/* ==========================================================================
   Reusable UI Elements & Layout Utilities
   ========================================================================== */
.container {
  width: 90%;
  max-width: var(--container-width);
  margin: 0 auto;
}

.section-padding {
  padding: 100px 0;
}

.glass-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
  transition: border-color 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
  background: var(--bg-panel-hover);
  border-color: rgba(79, 70, 229, 0.25);
  box-shadow: var(--shadow-lg), var(--neon-glow-indigo);
}

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-muted {
  color: var(--text-muted);
}

.font-mono {
  font-family: var(--font-mono);
}

.text-center {
  text-align: center;
}

.justify-center {
  display: flex;
  justify-content: center;
}

.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }

/* Font Colors & Accents */
.font-cyan { color: var(--accent-cyan) !important; }
.font-indigo { color: var(--accent-indigo) !important; }
.font-purple { color: var(--accent-purple) !important; }
.font-green { color: #10b981 !important; }

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
  background: #1e1e2f;
  border-radius: 5px;
  border: 2px solid var(--bg-darker);
}

::-webkit-scrollbar-thumb:hover {
  background: #2e2e4a;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #ffffff; /* White text for perfect contrast on gradient */
  box-shadow: var(--neon-glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.4);
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--bg-control);
  border: 1px solid var(--border-light);
  color: var(--text-light);
}

.btn-secondary:hover {
  background: var(--bg-control-hover);
  border-color: var(--border-control-hover);
  transform: translateY(-2px);
}

.icon-sm { width: 16px; height: 16px; }
.icon-md { width: 20px; height: 20px; }
.icon-lg { width: 28px; height: 28px; }

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: all 0.3s ease;
  border-bottom: 1px solid transparent;
}

.blur-header {
  background: var(--bg-header);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--text-light);
}

.logo-accent {
  color: var(--accent-cyan);
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.nav a:hover, .nav a.active {
  color: var(--text-light);
}

.nav-cta {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
  border: 1px solid var(--border-glow);
  padding: 8px 20px !important;
  border-radius: 6px;
  color: var(--text-light) !important;
}

.nav-cta:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(6, 182, 212, 0.25) 100%);
  border-color: var(--accent-cyan);
  box-shadow: var(--neon-glow-cyan);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-lang {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid var(--border-light);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-lang:hover {
  background: rgba(15, 23, 42, 0.08);
  border-color: rgba(15, 23, 42, 0.15);
}

.btn-mobile-nav {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}

.badge-new {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  color: var(--accent-cyan);
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulse-glow 2s infinite;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: 1.1;
  margin-bottom: 16px;
  font-weight: 800;
  background: var(--hero-title-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.2rem, 2vw, 1.8rem);
  line-height: 1.3;
  margin-bottom: 20px;
  font-weight: 500;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 600px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  position: relative;
}

.avatar-card {
  width: 100%;
  max-width: 320px;
  padding: 24px;
  text-align: center;
}

.avatar-container {
  width: 180px;
  height: 180px;
  margin: 0 auto 20px auto;
  border-radius: 50%;
  padding: 5px;
  background: var(--gradient-primary);
  box-shadow: var(--neon-glow-indigo);
}

.avatar-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-cover: cover;
  background-color: var(--bg-darker);
}

.avatar-details h3 {
  font-size: 1.4rem;
  margin-bottom: 4px;
}

.avatar-details p {
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.social-icons {
  display: flex;
  gap: 16px;
}

.social-icons a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
}

.social-icons a:hover {
  background: var(--gradient-primary);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--neon-glow-cyan);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--text-muted);
  cursor: pointer;
}

.hero-scroll-indicator i {
  font-size: 1.5rem;
}

/* ==========================================================================
   Section Headers
   ========================================================================== */
.section-header {
  margin-bottom: 60px;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 20%;
  right: 20%;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================================================
   About Section & Timeline
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 50px;
  align-items: start;
}

.about-bio {
  padding: 40px;
}

.about-bio h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-bio p {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

.bio-highlights {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.highlight-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.highlight-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--accent-indigo);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.highlight-item h4 {
  font-size: 1.1rem;
  margin-bottom: 2px;
}

.highlight-item p {
  font-size: 0.9rem;
}

.timeline {
  position: relative;
  padding-left: 30px;
  border-left: 2px dashed rgba(15, 23, 42, 0.12);
  margin-left: 10px;
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

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

.timeline-dot {
  position: absolute;
  left: -41px;
  top: 24px;
  width: 20px;
  height: 20px;
  background: var(--bg-darker);
  border: 3px solid var(--accent-indigo);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-indigo);
  transition: all 0.3s ease;
}

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

.timeline-date {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--accent-indigo);
  margin-bottom: 8px;
}

.timeline-content {
  padding: 24px;
}

.timeline-content h3 {
  font-size: 1.3rem;
  margin-bottom: 4px;
}

.timeline-location {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.timeline-content p {
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.project-filters {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.filter-btn {
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid var(--border-light);
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filter-btn:hover {
  background: rgba(15, 23, 42, 0.08);
  border-color: rgba(15, 23, 42, 0.15);
}

.filter-btn.active {
  background: var(--gradient-primary);
  color: #ffffff; /* White text for perfect contrast on gradient active */
  border-color: transparent;
  box-shadow: var(--neon-glow-cyan);
  font-weight: 600;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: 28px;
  height: 100%;
  transform-style: preserve-3d;
  will-change: transform;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.project-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.03);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-icon {
  width: 24px;
  height: 24px;
  color: var(--accent-cyan);
}

.project-tag {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid transparent;
}

.tag-sys {
  background: var(--bg-tag-sys);
  border-color: var(--border-tag-sys);
  color: var(--color-tag-sys);
}

.tag-web {
  background: var(--bg-tag-web);
  border-color: var(--border-tag-web);
  color: var(--color-tag-web);
}

.tag-other {
  background: var(--bg-tag-other);
  border-color: var(--border-tag-other);
  color: var(--color-tag-other);
}

.project-body {
  flex-grow: 1;
}

.project-card-title {
  font-size: 1.4rem;
  margin-bottom: 12px;
  transition: color 0.3s ease;
}

.project-card:hover .project-card-title {
  color: var(--accent-cyan);
}

.project-card-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.project-features-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 0.85rem;
}

.project-features-list span {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
}

.project-features-list i {
  color: var(--accent-cyan);
}

.project-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

.project-status {
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.status-dot.green {
  background-color: #10b981;
  box-shadow: 0 0 8px #10b981;
}

.status-dot.orange {
  background-color: #f59e0b;
  box-shadow: 0 0 8px #f59e0b;
}

.status-dot.yellow {
  background-color: #eab308;
  box-shadow: 0 0 8px #eab308;
}

.status-dot.blue {
  background-color: #3b82f6;
  box-shadow: 0 0 8px #3b82f6;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.project-link:hover {
  color: var(--text-light);
}

/* ==========================================================================
   Skills Section
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.skills-category {
  padding: 35px;
}

.category-title {
  font-size: 1.4rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 14px;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.skill-tag {
  background: rgba(15, 23, 42, 0.03);
  border: 1px solid var(--border-light);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: inline-flex;
  align-items: center;
  color: var(--text-light);
}

.skills-category:nth-child(1) .skill-tag:hover {
  border-color: var(--accent-cyan);
  box-shadow: var(--neon-glow-cyan);
  transform: translateY(-2px);
}

.skills-category:nth-child(2) .skill-tag:hover {
  border-color: var(--accent-indigo);
  box-shadow: var(--neon-glow-indigo);
  transform: translateY(-2px);
}

.skills-category:nth-child(3) .skill-tag:hover {
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.25);
  transform: translateY(-2px);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 50px;
}

.contact-info {
  padding: 40px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.contact-info h3 {
  font-size: 1.8rem;
  margin-bottom: 12px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.contact-info p {
  font-size: 1.05rem;
  margin-bottom: 32px;
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  flex-grow: 1;
}

.info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.info-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.03);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.info-item h4 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.info-link {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-light);
}

.info-link:hover {
  color: var(--accent-cyan);
}

/* Animated tech graphic */
.contact-illustration-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px 0;
}

.tech-graphic {
  position: relative;
  width: 140px;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tech-graphic .circle {
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid transparent;
}

.tech-graphic .outer {
  width: 100%;
  height: 100%;
  border-color: rgba(6, 182, 212, 0.2);
  border-top-color: var(--accent-cyan);
  animation: rotate 8s linear infinite;
}

.tech-graphic .middle {
  width: 75%;
  height: 75%;
  border-color: rgba(99, 102, 241, 0.2);
  border-bottom-color: var(--accent-indigo);
  animation: rotate-reverse 6s linear infinite;
}

.tech-graphic .inner {
  width: 50%;
  height: 50%;
  border-color: rgba(168, 85, 247, 0.1);
  border-left-color: var(--accent-purple);
  animation: rotate 4s linear infinite;
}

.tech-graphic .center-icon {
  font-size: 1.5rem;
  color: var(--text-light);
  z-index: 2;
  animation: pulse-glow 2s infinite;
}

/* Contact Form */
.contact-form-panel {
  padding: 40px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: opacity 0.3s ease;
}

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

.form-group label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-group input, .form-group textarea {
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--text-light);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus, .form-group textarea:focus {
  border-color: var(--accent-indigo);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.15);
}

.btn-submit {
  justify-content: center;
  gap: 12px;
}

.success-message {
  padding: 40px 0;
  animation: fadeInUp 0.4s ease-out forwards;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-light);
  background-color: var(--bg-darker);
  padding: 40px 0;
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.copyright {
  font-size: 0.95rem;
}

.built-with {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Keyframe Animations
   ========================================================================== */
@keyframes pulse-glow {
  0% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); opacity: 0.8; }
}

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

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

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
  100% { transform: translateY(0px); }
}

.animate-bounce {
  animation: bounce 2s infinite;
}

/* Scroll Animation Trigger Utility */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */

/* Tablet view */
@media (max-width: 992px) {
  :root {
    --header-height: 70px;
  }
  
  .section-padding {
    padding: 70px 0;
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .badge-new {
    margin-bottom: 16px;
  }
  
  .hero-description {
    margin: 0 auto 32px auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .contact-info {
    align-items: center;
    text-align: center;
  }
  
  .info-list {
    align-items: center;
  }
}

/* Mobile Nav Styles */
@media (max-width: 768px) {
  .btn-mobile-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(15, 23, 42, 0.04);
    border: 1px solid var(--border-light);
    border-radius: 6px;
  }
  
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: var(--bg-darker);
    flex-direction: column;
    justify-content: center;
    gap: 40px;
    padding: 40px;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    border-top: 1px solid var(--border-light);
  }
  
  .nav.open {
    transform: translateX(0);
  }
  
  .nav a {
    font-size: 1.3rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn-primary, .hero-actions .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}