[data-theme="light"] {
  --primary: #6750a4;
  --on-primary: #ffffff;
  --surface: #fef7ff;
  --surface-container: #f3edf7;
  --on-surface: #1d1b20;
  --outline: #cac4d0;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --radius: 16px;
}

[data-theme="dark"] {
  --primary: #d0bcff;
  --on-primary: #381e72;
  --surface: #1d1b20;
  --surface-container: #2b2930;
  --on-surface: #e6e1e5;
  --outline: #938f99;
  --shadow: 0 4px 12px rgba(0,0,0,0.4);
  --radius: 16px;
}

* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  margin-bottom: 0px;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--on-surface);
}

.container {
  max-width: 900px;
  padding: 32px 16px;
  margin: 0 auto;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 8px;
}

h2 {
  margin-top: 0px;
}

p.about {
  color: #555;
  margin-bottom: 16px;
}

p.subtitle {
  color: #555;
  margin-top: 16px;
}

.card {
  background: var(--surface-container);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 32px;
}

.buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 16px;
}

button, a.button {
  border: none;
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: background 0.2s, box-shadow 0.2s;
}

.primary {
  background: var(--primary);
  color: var(--on-primary);
}

.primary:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.outlined {
  background: transparent;
  border: 1px solid var(--outline) !important;
  color: var(--on-surface);
}

.outlined:hover {
  background: rgba(0,0,0,0.04);
}

.link-row {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

input {
  flex: 1;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--outline);
  font-size: 1rem;
  background: white;
}

footer {
  text-align: center;
  font-size: 0.8rem;
  color: #666;
  margin-top: 48px;
}

#themeToggle {
  position: fixed;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--outline);
  background: var(--surface-container);
  color: var(--on-surface);
  font-size: 20px;
  cursor: pointer;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.1s;
  z-index: 1000;
}

#themeToggle:hover {
  transform: scale(1.05);
}

/* ================= Links ================= */
a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: color 0.2s ease;
}

a:hover {
  color: color-mix(in srgb, var(--primary) 85%, black);
}

a:focus-visible {
  outline: none;
}

a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s ease;
}

a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

a.button::after {
  display: none !important;
}

a.button.primary,
a.button.primary:hover,
a.button.primary:focus-visible {
  color: var(--on-primary);
}

p a {
  font-weight: 500;
}

a:focus-visible::after {
  transform: scaleX(1);
}