:root {
  /* Master font-size controller */
  --font-size-base: 18px;

  /* Theme Canvas & Text */
  --bg-canvas: #030408;
  --grid-dot: rgba(79, 70, 229, 0.12);
  --card-bg: #060a14;
  --card-header-bg: #080e1c;
  --border-color: #172033;
  --shadow-color: #010204;
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --link-color: #38bdf8;
  --link-hover: #f43f5e;

  /* Semantic Color Palette */
  --color-lime: #00ff00;
  --color-emerald: #10b981;
  --color-sky: #0ea5e9;
  --color-rose: #f43f5e;
  --color-amber: #f59e0b;
  --color-teal: #14b8a6;
  --color-purple: #a855f7;
  --color-indigo: #818cf8;
  --color-coral: #f97316;
  --color-cobalt: #2563eb;

  /* Tag Badges */
  --tag-yt-bg: #2d1217;
  --tag-yt-text: #fda4af;
  --tag-yt-border: #881337;

  --tag-web-bg: #1e1b4b;
  --tag-web-text: #c7d2fe;
  --tag-web-border: #4338ca;

  --tag-term-bg: #0f172a;
  --tag-term-text: #93c5fd;
  --tag-term-border: #1e3a8a;

  /* Header & Toggle */
  --header-glow: rgba(79, 70, 229, 0.08);
  --header-badge-bg: rgba(79, 70, 229, 0.16);
  --header-badge-border: rgb(79, 70, 229);
  --header-badge-text: #c7d2fe;

  --toggle-bg: #0d1527;
  --toggle-text: #c7d2fe;
  --toggle-border: rgb(79, 70, 229);
}

[data-theme="light"] {
  --bg-canvas: #faf7f2;
  --grid-dot: #e2d9c8;
  --card-bg: #ffffff;
  --card-header-bg: #ffffff;
  --border-color: #1e1b4b;
  --shadow-color: #1e1b4b;
  --text-main: #1e1b4b;
  --text-muted: #475569;
  --link-color: #2563eb;
  --link-hover: #f43f5e;

  /* Light Theme Variant Adjustments */
  --color-lime: #00a800;
  --color-emerald: #059669;
  --color-sky: #0284c7;
  --color-rose: #e11d48;
  --color-amber: #d97706;
  --color-teal: #0d9488;
  --color-purple: #7c3aed;
  --color-indigo: #4f46e5;
  --color-coral: #ea580c;
  --color-cobalt: #1d4ed8;

  --tag-yt-bg: #ffe4e6;
  --tag-yt-text: #be123c;
  --tag-yt-border: #f43f5e;

  --tag-web-bg: #e0e7ff;
  --tag-web-text: #3730a3;
  --tag-web-border: #6366f1;

  --tag-term-bg: #f1f5f9;
  --tag-term-text: #1e293b;
  --tag-term-border: #94a3b8;

  --header-glow: #fef3c7;
  --header-badge-bg: #e0e7ff;
  --header-badge-border: #4338ca;
  --header-badge-text: #3730a3;

  --toggle-bg: #fef08a;
  --toggle-text: #1e1b4b;
  --toggle-border: #1e1b4b;
}

/* Base resets & typography */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
}

body {
  background-color: var(--bg-canvas);
  background-image: 
    radial-gradient(var(--grid-dot) 1.2px, transparent 1.2px),
    radial-gradient(var(--grid-dot) 1.2px, var(--bg-canvas) 1.2px);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px;
  color: var(--text-main);
  font-family: 'Space Grotesk', 'Martian Mono', monospace, sans-serif;
  font-size: 1rem;
  line-height: 1.55;
  letter-spacing: -0.1px;
  padding: 20px 22px 30px 22px;
  max-width: 1220px;
  margin: 0 auto;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a {
  color: var(--link-color);
  text-decoration: underline;
  text-underline-offset: 2.5px;
  transition: all 0.12s ease;
}

a:hover {
  color: var(--link-hover);
  text-decoration: none;
}

/* Header */
header {
  background: var(--card-header-bg);
  border: 2px solid var(--border-color);
  border-radius: 14px;
  box-shadow: 4px 4px 0px var(--shadow-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  margin-bottom: 16px;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.header-info-group {
  display: flex;
  align-items: center;
  gap: 18px;
}

.avatar {
  width: 150px;
  height: 200px;
  aspect-ratio: 3 / 4;
  border-radius: 12px;
  object-fit: cover;
  image-rendering: auto;
  transform: translateZ(0);
  border: 2px solid var(--color-indigo);
  box-shadow: 3px 3px 0px var(--shadow-color);
  background-color: var(--card-bg);
  flex-shrink: 0;
}

.header-text h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-main);
  line-height: 1.15;
  margin-bottom: 4px;
}

.header-text p {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.header-text strong {
  color: var(--text-main);
  font-weight: 700;
}

.header-email-badge {
  display: inline-block;
  font-family: 'Martian Mono', monospace;
  font-size: 0.77rem;
  font-weight: 600;
  color: var(--header-badge-text);
  background: var(--header-badge-bg);
  border: 1.2px solid var(--header-badge-border);
  border-radius: 6px;
  padding: 2px 9px;
  margin-top: 5px;
}

/* Theme Toggle */
.theme-toggle-btn {
  font-family: 'Martian Mono', monospace;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--toggle-text);
  background: var(--toggle-bg);
  border: 1.8px solid var(--toggle-border);
  border-radius: 9px;
  padding: 7px 14px;
  box-shadow: 2px 2px 0px var(--shadow-color);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
  user-select: none;
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--shadow-color);
}

.theme-toggle-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--shadow-color);
}

/* 3-Column Layout */
.columns-container {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 15px;
  align-items: start;
  width: 100%;
}

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

/* Accent Mapping */
.accent-lime    { --accent-color: var(--color-lime); }
.accent-emerald { --accent-color: var(--color-emerald); }
.accent-sky     { --accent-color: var(--color-sky); }
.accent-rose    { --accent-color: var(--color-rose); }
.accent-amber   { --accent-color: var(--color-amber); }
.accent-teal    { --accent-color: var(--color-teal); }
.accent-purple  { --accent-color: var(--color-purple); }
.accent-indigo  { --accent-color: var(--color-indigo); }
.accent-coral { --accent-color: var(--color-coral); }
.accent-cobalt { --accent-color: var(--color-cobalt); }

/* Unified Column Card */
.column-card {
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-top: 3.5px solid var(--accent-color, var(--border-color));
  border-radius: 14px;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  box-shadow: 4px 4px 0px var(--shadow-color);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.column-card:hover {
  transform: translateY(-2px);
  box-shadow: 4px 6px 0px var(--shadow-color);
}

/* Headings & Dynamic Accents */
h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: 2px;
  margin-bottom: 4px;
}

h2 .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
  background-color: var(--accent-color, var(--border-color));
}

/* Content Blocks */
.item-block {
  background: rgba(255, 255, 255, 0.02);
  border-radius: 8px;
  padding: 2px 0;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.item-block + .item-block {
  margin-top: 10px;
}

.item-block p {
  margin-bottom: 4px;
  line-height: 1.48;
}

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

.item-block strong {
  color: var(--text-main);
  font-weight: 600;
}

.item-block em {
  font-style: normal;
  color: var(--text-muted);
  font-size: 0.93rem;
}

/* Interactive Badges & Links */
.links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 5px;
}

.tag-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: 'Martian Mono', monospace;
  font-size: 0.73rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.12s ease;
  white-space: nowrap;
}

.tag-link svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

.tag-link:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.tag-youtube {
  background: var(--tag-yt-bg);
  color: var(--tag-yt-text);
  border: 1px solid var(--tag-yt-border);
}

.tag-youtube svg {
  fill: #f43f5e;
}

.tag-web {
  background: var(--tag-web-bg);
  color: var(--tag-web-text);
  border: 1px solid var(--tag-web-border);
}

.tag-pdf {
  color: var(--color-amber);
  border: 1px solid var(--color-amber);
  background: color-mix(in srgb, var(--color-amber) 12%, transparent);
}

.term-badge {
  display: inline-block;
  font-family: 'Martian Mono', monospace;
  font-size: 0.73rem;
  font-weight: 600;
  color: var(--accent-color, var(--color-teal));
  background: color-mix(in srgb, var(--accent-color, var(--color-teal)) 12%, transparent);
  border: 1px solid var(--accent-color, var(--color-teal));
  border-radius: 5px;
  padding: 1px 6px;
  margin-left: 5px;
  vertical-align: middle;
}

/* Bullet Lists */
ul {
  list-style-type: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

li {
  position: relative;
  padding-left: 16px;
  line-height: 1.48;
}

li::before {
  content: "✦";
  position: absolute;
  left: 0;
  top: 1px;
  font-size: 0.67rem;
  color: var(--accent-color, var(--color-sky));
}

/* Connect / Socials */
.connect-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: rgba(255, 255, 255, 0.02);
  border: 1.2px solid var(--border-color);
  border-radius: 8px;
  padding: 7px 12px;
  color: var(--text-main);
  text-decoration: none;
  font-family: 'Martian Mono', monospace;
  font-size: 0.83rem;
  font-weight: 600;
  transition: all 0.12s ease;
}

.social-label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.social-label svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
  flex-shrink: 0;
}

.social-btn span.social-arrow {
  color: var(--text-muted);
  font-size: 0.83rem;
  transition: transform 0.12s ease, color 0.12s ease;
}

.social-btn:hover {
  background: color-mix(in srgb, var(--accent-color, var(--color-indigo)) 16%, transparent);
  border-color: var(--accent-color, var(--color-indigo));
  color: var(--text-main);
  transform: translateX(2px);
}

.social-btn:hover span.social-arrow {
  transform: translateX(2px);
  color: var(--accent-color, var(--color-indigo));
}

/* Responsive adjustments */
@media (max-width: 720px) {
  .columns-container {
    grid-template-columns: 1fr;
  }
  header {
    flex-direction: column;
    align-items: flex-start;
  }
  .theme-toggle-btn {
    align-self: flex-end;
  }
}