:root {
  --bg: #f7f7f9;
  --panel: #ffffff;
  --text: #222222;
  --muted: #6b7280;
  --accent: #0366d6;
  --max-width: 800px;
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, system-ui;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.7;
}
header.site-header {
  background: transparent;
  padding: 18px 0;
}
/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764227 100%);
  min-height: 100vh;
  padding: 2rem;
}

.container {
  max-width: 80%;
  margin: 0 auto;
}

/* Profile Card */
.profile-card {
  background: white;
  border-radius: 24px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  padding: 3rem;
  overflow: hidden;
}

.profile-header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #e5e7eb;
}

.profile-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: #1f2937;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.profile-subtitle {
  font-size: 1.125rem;
  color: #6b7280;
  font-weight: 500;
}

/* Markdown Content Styles */
.markdown-body {
  line-height: 1.75;
  color: #374151;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  font-weight: 700;
  margin-bottom: 1rem;
  color: #1f2937;
}

.markdown-body h1 {
  font-size: 2rem;
}
.markdown-body h2 {
  font-size: 1.5rem;
}
.markdown-body h3 {
  font-size: 1.25rem;
}

.markdown-body p {
  margin-bottom: 1rem;
}

.markdown-body ul {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

.markdown-body li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.markdown-body li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #667eea;
  font-weight: bold;
}

.markdown-body code {
  background: #f3f4f6;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-family: "Monaco", "Menlo", monospace;
  font-size: 0.875rem;
  color: #d97601;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background: #f9fafb;
  border-radius: 8px;
  overflow: hidden;
}

.markdown-body td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e5e7eb;
}

.markdown-body tr:last-child td {
  border-bottom: none;
}

.markdown-body hr {
  border: none;
  height: 1px;
  background: linear-gradient(to right, #667eea, #764227);
  margin: 2rem 0;
}

/* Project Cards */
.project,
.job {
  background: #f9fafb;
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1rem 0;
  border-left: 4px solid #667eea;
}

.project h3,
.job h3 {
  color: #1f2937;
  margin-bottom: 0.5rem;
}

/* Skills Section */
.skills table {
  background: #f9fafb;
  border-radius: 8px;
}

/* Social Links */
.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764227 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(102, 158, 234, 0.3);
}

.btn-secondary {
  background: #f3f4f6;
  color: #374151;
}

.btn-secondary:hover {
  background: #e5e7eb;
}

/* Actions */
.actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e5e7eb;
}

/* Footer */
footer {
  text-align: center;
  color: #6b7280;
  font-size: 0.875rem;
  margin-top: 2rem;
}

/* Images */
.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1rem 0;
}

/* Responsive */
@media (max-width: 768px) {
  .profile-card {
    padding: 1.5rem;
  }

  .profile-title {
    font-size: 2rem;
  }

  .actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.profile-card {
  animation: fadeIn 0.6s ease-out;
}

/* Print Styles */
@media print {
  body {
    background: white;
    padding: 0;
  }

  .profile-card {
    box-shadow: none;
    border-radius: 0;
    padding: 0;
  }

  .btn {
    display: none;
  }
}

.site-nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-title {
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  font-size: 1.05rem;
}
.nav-links {
  font-size: 0.95rem;
  color: var(--muted);
}
/* Off-canvas menu */
/* Off-canvas overlay */
#offcanvas-nav {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: flex-start;
  justify-content: flex-start;
  background: rgba(0, 0, 0, 0.35);
}
#offcanvas-nav[aria-hidden="false"] {
  display: flex;
}
#offcanvas-nav .offcanvas-inner {
  width: 320px;
  max-width: 100%;
  background: var(--panel);
  height: 100%;
  box-shadow: 2px 0 28px rgba(16, 24, 40, 0.12);
  padding: 18px;
  transform: translateX(-12px) translateX(-100%);
  transition: transform 0.28s cubic-bezier(0.2, 0.9, 0.2, 1);
}
#offcanvas-nav[aria-hidden="false"] .offcanvas-inner {
  transform: translateX(0);
}
#offcanvas-nav .menu-content {
  margin-top: 8px;
}
#offcanvas-nav .menu-links {
  list-style: none;
  padding: 0;
}
#offcanvas-nav .menu-links li {
  margin: 10px 0;
}
#offcanvas-nav .menu-links a {
  color: var(--text);
  text-decoration: none;
}
#offcanvas-nav #menu-close {
  background: transparent;
  border: 0;
  font-size: 1.1rem;
  cursor: pointer;
}

@media (max-width: 900px) {
  #offcanvas-nav .offcanvas-inner {
    width: 100%;
  }
}
@media (min-width: 901px) {
  /* Ensure the mobile-only floating toggle is hidden on larger screens */
  .toc-mobile-toggle { display: none !important; }
}

/* Active heading highlight + body attribute-driven accent */
article h2.active-heading,
article h3.active-heading {
  color: var(--accent);
}
/* Set body data-active-index to change small accent (vibrant palette) */
body[data-active-index] .site-title {
  transition: color 0.2s;
}
body[data-active-index="0"] article {
  border-left: 4px solid rgba(255, 99, 71, 0.12);
} /* tomato */
body[data-active-index="1"] article {
  border-left: 4px solid rgba(255, 165, 0, 0.12);
} /* orange */
body[data-active-index="2"] article {
  border-left: 4px solid rgba(255, 205, 86, 0.12);
} /* yellow */
body[data-active-index="3"] article {
  border-left: 4px solid rgba(102, 187, 106, 0.12);
} /* green */
body[data-active-index="4"] article {
  border-left: 4px solid rgba(66, 165, 245, 0.12);
} /* blue */
body[data-active-index="5"] article {
  border-left: 4px solid rgba(123, 31, 162, 0.12);
} /* purple */
body[data-active-index="6"] article {
  border-left: 4px solid rgba(233, 30, 99, 0.12);
} /* pink */
body[data-active-index="7"] article {
  border-left: 4px solid rgba(0, 188, 212, 0.12);
} /* cyan */
body[data-active-index="8"] article {
  border-left: 4px solid rgba(156, 39, 176, 0.12);
} /* deep purple */
main.container {
  margin: 28px auto;
  padding: 20px;
  background: transparent;
}
article {
  background: var(--panel);
  border-radius: 8px;
  padding: 28px 32px;
  box-shadow: 0 8px 30px rgba(16, 24, 40, 0.07);
}
article h1,
article h2,
article h3 {
  color: var(--text);
  margin-top: 1.2rem;
  margin-bottom: 0.6rem;
  line-height: 1.2;
}
article p {
  color: var(--text);
  margin: 0 0 1rem 0;
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
pre,
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Roboto Mono", "Courier New", monospace;
}
pre {
  background: #0f1724;
  color: #e6eef8;
  padding: 12px;
  border-radius: 6px;
  overflow: auto;
  font-size: 0.9rem;
}
code {
  background: #f3f4f6;
  padding: 0 6px;
  border-radius: 4px;
}
/* Images and media */
article img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 12px 0;
}

/* Blockquotes */
blockquote {
  border-left: 4px solid rgba(3, 102, 214, 0.12);
  background: linear-gradient(90deg, rgba(3, 102, 214, 0.03), transparent);
  padding: 12px 16px;
  margin: 16px 0;
  color: var(--muted);
  border-radius: 6px;
}

/* Lists */
article ul,
article ol {
  margin: 0 0 1rem 1.2rem;
}

/* Headings spacing & anchors */
article h1 {
  font-size: 1.6rem;
}
article h2 {
  font-size: 1.3rem;
}
article h3 {
  font-size: 1.1rem;
}
article h1,
article h2,
article h3 {
  scroll-margin-top: 80px;
}

/* Anchor links for headings */
article h2 a.anchor,
article h3 a.anchor {
  opacity: 0;
  color: var(--muted);
  text-decoration: none;
  margin-left: 8px;
  font-size: 0.85rem;
}
article h2:hover a.anchor,
article h3:hover a.anchor {
  opacity: 1;
}

/* Table of Contents (TOC) */
.content-with-toc {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 20px;
  align-items: start;
}
.toc {
  position: sticky;
  top: 100px;
  max-height: 70vh;
  overflow: auto;
  padding: 12px 16px;
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.9));
  border: 1px solid rgba(16, 24, 40, 0.04);
  font-size: 0.95rem;
  width: 220px;
}
.toc h4 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 8px 0;
  font-size: 0.95rem;
}
.toc .toc-toggle {
  background: transparent;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.95rem;
  /* always hide the inline toggle button; we use a floating mobile-only toggle */
  display: none !important;
}
.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc li {
  margin: 6px 0;
}
.toc a {
  color: var(--muted);
  text-decoration: none;
}
.toc a.active {
  color: var(--accent);
  font-weight: 600;
}
.toc.collapsed {
  display: none;
}
/* Mobile TOC off-canvas styles and mobile toggle */
.toc-backdrop {
  display: none; /* toggled by JS */
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 9998;
}

/* Ensure mobile toggle exists but hidden by default; media query will show it.
   This avoids relying solely on JS to control visibility. */
.toc-mobile-toggle {
  display: none;
  position: fixed;
  bottom: 18px;
  right: 18px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764227 100%);
  color: #fff;
  border: none;
  box-shadow: 0 8px 24px rgba(16,24,40,0.2);
  font-size: 1.4rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  cursor: pointer;
}


.toc {
  transition: transform 0.28s ease, opacity 0.28s ease;
}

/* Mobile off-canvas presentation when .toc.open is set */
@media (max-width: 900px) {
  .toc {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 320px;
    max-width: 100%;
    transform: translateX(-105%);
    z-index: 9999;
    overflow: auto;
    background: var(--panel);
    box-shadow: 2px 0 28px rgba(16,24,40,0.12);
    padding: 18px;
    border-radius: 0;
  }
  .toc.open {
    transform: translateX(0);
  }
  /* ensure the inline header button inside the TOC is hidden in mobile view
     because we provide a floating icon-only button instead */
  .toc .toc-toggle { display: none; }
  /* mobile floating icon-only toggle */
  .toc-mobile-toggle {
    display: inline-flex !important;
    position: fixed;
    bottom: 18px;
    right: 18px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764227 100%);
    color: #fff;
    border: none;
    box-shadow: 0 8px 24px rgba(16,24,40,0.2);
    font-size: 1.4rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    cursor: pointer;
  }
  .toc-mobile-toggle:focus { outline: 3px solid rgba(102,126,234,0.35); }
}
footer.site-footer {
  max-width: var(--max-width);
  margin: 36px auto;
  padding: 12px 20px;
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}
@media (max-width: 600px) {
  article {
    padding: 18px;
  }
  .site-nav {
    padding: 0 12px;
  }
}

@media (max-width: 900px) {
  .content-with-toc {
    grid-template-columns: 1fr;
  }
  .toc {
    position: relative;
    top: 0;
    max-height: none;
    width: 100%;
    margin-bottom: 12px;
  }
  .toc.collapsed {
    display: none;
  }
}

/* Anchor link visible on hover */
article h2 a.anchor,
article h3 a.anchor {
  opacity: 0;
  color: var(--muted);
  text-decoration: none;
  margin-left: 8px;
  font-size: 0.9rem;
}
article h2:hover a.anchor,
article h3:hover a.anchor {
  opacity: 1;
}