/* ==========================================================================
   Design System: Solid Black Background (#000000)
   Hello World! Header Logo, Prominent Motto, LaTeX-y Serif Body
   ========================================================================== */

:root {
  /* Solid Pure Black Background */
  --bg-base: #000000;
  --bg-surface: #111218;
  --bg-surface-hover: #181a24;
  --bg-input: #0f1016;

  /* Glass Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  /* Typography Colors */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-link: #ee4c2c;
  --text-link-hover: #ff7052;

  /* Accents */
  --accent-pytorch: #ee4c2c;
  --accent-pytorch-glow: rgba(238, 76, 44, 0.12);
  --accent-indigo: #818cf8;
  --accent-cyan: #38bdf8;
  --accent-neon-green: #00ff66;

  /* Typography Font Stacks */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: 'Lora', 'CMU Serif', 'Latin Modern Roman', 'Georgia', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Layout Dimensions */
  --max-width-content: 820px;
  --max-width-wide: 1040px;
  --header-height: 56px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.68;
  color: var(--text-primary);
  background-color: var(--bg-base);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-base); /* Solid Pure Black */
}

/* Links */
a {
  color: var(--text-link);
  text-decoration: none;
  border-bottom: 1px solid rgba(238, 76, 44, 0.45);
  padding-bottom: 1px;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--text-link-hover);
  border-bottom-color: var(--text-link-hover);
  text-shadow: 0 0 10px rgba(238, 76, 44, 0.25);
}

.link-arrow {
  font-size: 0.72em;
  margin-left: 0.35rem;
  color: var(--accent-pytorch);
  opacity: 0.85;
  display: inline-block;
  transition: transform 0.2s ease, opacity 0.2s ease, color 0.2s ease;
}

a:hover .link-arrow {
  opacity: 1;
  color: var(--text-link-hover);
  transform: translate(2px, -2px);
}


/* Blowfish Translucent Glass Floating Header Bar */
.site-header {
  position: sticky;
  top: 1rem;
  z-index: 100;
  height: var(--header-height);
  max-width: var(--max-width-wide);
  width: calc(100% - 2rem);
  margin: 0 auto;
  background: rgba(17, 18, 24, 0.45);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.header-container {
  max-width: 100%;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Terminal Hello World Header Logo */
.site-logo {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--accent-neon-green);
  text-shadow: 0 0 12px rgba(0, 255, 102, 0.4);
  text-decoration: none;
  border-bottom: none;
  letter-spacing: -0.01em;
}

.site-logo:hover {
  color: #33ff85;
  text-decoration: none;
  border-bottom: none;
  text-shadow: 0 0 16px rgba(0, 255, 102, 0.6);
}

.logo-rest {
  color: var(--accent-neon-green);
}

.terminal-cursor {
  display: inline-block;
  margin-left: 2px;
  color: var(--accent-neon-green);
  animation: blink 1s step-start infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.header-right-group {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: none;
  padding-bottom: 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 2px solid var(--accent-pytorch);
  padding-bottom: 2px;
}

/* Header Social Icon Links */
.header-social-icons {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding-left: 0.85rem;
  border-left: 1px solid var(--border-subtle);
}

.header-icon-link {
  color: var(--text-secondary);
  font-size: 1.05rem;
  text-decoration: none;
  border-bottom: none;
  padding-bottom: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease, transform 0.2s ease;
}

.header-icon-link:hover {
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: none;
  transform: translateY(-1px);
}

/* Neon Green GSP Badge (Very Right Side) */
.header-gsp-tag {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.92rem;
  color: var(--accent-neon-green);
  text-shadow: 0 0 12px rgba(0, 255, 102, 0.45);
  padding-left: 0.85rem;
  border-left: 1px solid var(--border-subtle);
  letter-spacing: 0.05em;
}

/* Main Layout */
.main-wrapper {
  flex: 1;
  max-width: var(--max-width-wide);
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem 1.5rem;
}

.content-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

/* Hero Section */
.hero-section {
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 3.5rem;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.4rem;
}

/* Technical Monospace Subtitle */
.hero-subtitle {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--text-secondary);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
}


/* Prominent Motto Styling */
.hero-motto {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent-pytorch);
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  text-shadow: 0 0 15px rgba(238, 76, 44, 0.2);
}

.hero-bio {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.75rem;
}

/* 2x2 Independent Math Grid Blobs */
.math-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1.25rem 0 2rem 0;
}

.math-blob {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: border-color 0.2s ease;
}

.math-blob:hover {
  border-color: var(--border-strong);
}

.math-blob-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-pytorch);
  margin-bottom: 0.5rem;
}

.math-blob-body {
  font-size: 0.95rem;
  color: var(--text-primary);
  text-align: center;
  overflow-x: auto;
}

/* Technical Action Buttons */
.action-links {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  border-bottom: none;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}

.hero-btn:hover {
  text-decoration: none;
  border-bottom: none;
  background: var(--bg-surface-hover);
  border-color: var(--border-strong);
  color: #ffffff;
}

/* Button Accents */
.btn-resume {
  border-color: rgba(238, 76, 44, 0.4);
  color: #ff7052;
}
.btn-resume:hover {
  background: rgba(238, 76, 44, 0.15);
  border-color: var(--accent-pytorch);
  color: #ffffff;
}

.btn-github {
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}
.btn-github:hover {
  color: #ffffff;
  border-color: var(--border-strong);
}

.btn-linkedin {
  border-color: rgba(129, 140, 248, 0.3);
  color: var(--accent-indigo);
}
.btn-linkedin:hover {
  background: rgba(129, 140, 248, 0.12);
  border-color: var(--accent-indigo);
  color: #ffffff;
}

.btn-email {
  border-color: rgba(56, 189, 248, 0.3);
  color: var(--accent-cyan);
}
.btn-email:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--accent-cyan);
  color: #ffffff;
}

/* Section Headings */
.section-heading {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.5rem;
}

/* Experience Feed with Authentic Photos */
.experience-feed {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-bottom: 4rem;
}

.experience-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 280px 1fr;
  transition: border-color 0.2s ease;
}

.experience-card:hover {
  border-color: var(--border-strong);
}

.experience-img-container {
  width: 100%;
  height: 100%;
  min-height: 200px;
  background: #000;
  position: relative;
  overflow: hidden;
}

.experience-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.experience-card:hover .experience-img {
  transform: scale(1.03);
}

.experience-details {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.experience-title {
  font-family: var(--font-serif);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 0.5rem;
}

.experience-body {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.68;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1.35rem;
  transition: border-color 0.2s ease;
}

.project-card:hover {
  border-color: var(--border-strong);
}

.project-title {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.project-desc {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.68;
}

.project-math {
  margin-top: 0.75rem;
  padding: 0.4rem 0.6rem;
  background: var(--bg-base);
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--accent-pytorch);
  text-align: center;
}

/* Contact Form Section */
.contact-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 2rem;
  margin-bottom: 4rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-pytorch);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.btn-submit {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--accent-pytorch);
  color: #ffffff;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

.btn-submit:hover {
  background: #d83e20;
}

/* Article Body Typography */
.article-body p {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  line-height: 1.8;
  color: var(--text-primary);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2rem 1.5rem;
  background: var(--bg-base);
  margin-top: auto;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-container {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-social {
  display: flex;
  gap: 1.25rem;
}

/* Mobile Responsiveness (Phones ONLY) */
@media (max-width: 768px) {
  .site-header {
    width: calc(100% - 1.5rem);
    top: 0.65rem;
    height: 48px;
    padding: 0 1rem;
    border-radius: 24px;
  }
  .header-container {
    padding: 0;
    justify-content: space-between;
    align-items: center;
  }
  .nav-menu {
    display: none !important; /* Hide text nav links on phone screens */
  }
  .site-logo {
    font-size: 0.92rem;
    white-space: nowrap;
  }
  .header-right-group {
    gap: 0.85rem;
  }
  .header-social-icons {
    display: flex !important;
    gap: 0.75rem;
  }
  .header-icon-link {
    font-size: 1.05rem;
  }
  .header-gsp-tag {
    font-size: 0.7rem;
    padding: 0.18rem 0.5rem;
    border-radius: 12px;
  }
  .math-grid {
    grid-template-columns: 1fr;
  }
  .experience-card {
    grid-template-columns: 1fr;
  }
  .experience-img-container {
    height: 220px;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .hero-name {
    font-size: 1.85rem;
  }
}