:root {
  --ink: #172554;
  --ink-soft: #334155;
  --paper: #ffffff;
  --line: #dbeafe;
  --bg-layer-a: radial-gradient(1200px 600px at -10% -20%, rgba(244, 114, 182, 0.4) 0%, rgba(244, 114, 182, 0) 65%);
  --bg-layer-b: radial-gradient(1000px 500px at 100% 0%, rgba(59, 130, 246, 0.45) 0%, rgba(59, 130, 246, 0) 65%);
  --bg-layer-c: linear-gradient(145deg, #fdf2f8 0%, #eff6ff 40%, #ecfeff 100%);
  --card-bg: rgba(255, 255, 255, 0.8);
  --card-border: rgba(255, 255, 255, 0.95);
  --elev-shadow: 0 16px 34px rgba(30, 41, 59, 0.14);
}

html[data-theme="dark"] {
  --ink: #e2e8f0;
  --ink-soft: #cbd5e1;
  --paper: #0f172a;
  --line: #334155;
  --bg-layer-a: radial-gradient(1200px 600px at -10% -20%, rgba(236, 72, 153, 0.22) 0%, rgba(236, 72, 153, 0) 70%);
  --bg-layer-b: radial-gradient(1000px 500px at 100% 0%, rgba(59, 130, 246, 0.25) 0%, rgba(59, 130, 246, 0) 70%);
  --bg-layer-c: linear-gradient(145deg, #020617 0%, #0f172a 45%, #111827 100%);
  --card-bg: rgba(15, 23, 42, 0.78);
  --card-border: rgba(51, 65, 85, 0.8);
  --elev-shadow: 0 16px 34px rgba(2, 6, 23, 0.45);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Plus Jakarta Sans", "Avenir Next", "Segoe UI", "-apple-system", "BlinkMacSystemFont", sans-serif;
  color: var(--ink);
  background: var(--bg-layer-a), var(--bg-layer-b), var(--bg-layer-c);
  transition: background 0.35s ease, color 0.25s ease;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.theme-toggle-wrap {
  display: flex;
  justify-content: flex-end;
}

.theme-toggle {
  border: 1px solid var(--line);
  background: var(--paper);
  color: #3b82f6;
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  line-height: 1;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.theme-toggle:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.2);
}

.theme-toggle:active {
  transform: translateY(0) scale(0.98);
}

html[data-theme="dark"] .theme-toggle {
  background: rgba(15, 23, 42, 0.9);
  color: #60a5fa;
  border-color: rgba(59, 130, 246, 0.3);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  display: block;
  transition: transform 0.3s ease;
}

.theme-toggle:hover svg {
  transform: rotate(20deg);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(59, 130, 246, 0.3);
  border-radius: 4px;
  transition: background 0.2s;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(59, 130, 246, 0.5);
}