/* CSS Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Root Variables */
:root {
  --primary-color: #333;
  --secondary-color: #666;
  --accent-color: #007bff;
  --bg-color: #fff;
  --text-color: #333;
}

/* Typography */
html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  text-decoration: underline;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
}

/* Page Layout */
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  padding: 2rem 1.5rem;
  border-radius: 16px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.08);
  background-color: #f8f9fb;
}

header {
  margin-bottom: 1.5rem;
}

.profile-list ul {
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.profile-list li {
  background: #ffffff;
  padding: 1rem 1.2rem;
  border-radius: 14px;
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: transform 200ms ease, border-color 200ms ease, background-color 200ms ease;
  cursor: pointer;
}

.profile-list li:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 123, 255, 0.25);
}

.profile-list li.selected {
  background-color: rgba(0, 123, 255, 0.08);
  border-color: #007bff;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

button {
  border: none;
  border-radius: 999px;
  padding: 0.9rem 1.3rem;
  font-size: 1rem;
  cursor: pointer;
  color: #fff;
  background-color: var(--accent-color);
  transition: background-color 200ms ease, transform 200ms ease;
}

button:hover {
  background-color: #0056d6;
  transform: translateY(-1px);
}

button:focus {
  outline: 3px solid rgba(0, 123, 255, 0.35);
  outline-offset: 3px;
}

.card {
  padding: 1.2rem 1.4rem;
  border-radius: 18px;
  background-color: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.hidden {
  display: none !important;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%);
  padding: 0.95rem 1.2rem;
  border-radius: 999px;
  background: rgba(51, 51, 51, 0.95);
  color: white;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(-6px);
}

.dark-theme {
  --bg-color: #12131a;
  --text-color: #eeeeee;
  --primary-color: #f4f4f8;
  --secondary-color: #b0b4c0;
  --accent-color: #4dabff;
  background-color: #12131a;
  color: #eeeeee;
}

.dark-theme body {
  background-color: #12131a;
}

.dark-theme .container {
  background-color: #1b1d28;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

.dark-theme .profile-list li {
  background-color: #161824;
  border-color: rgba(255, 255, 255, 0.08);
}

.dark-theme .profile-list li.selected {
  background-color: rgba(77, 171, 255, 0.14);
}

.dark-theme button {
  background-color: #4dabff;
}

.dark-theme .card {
  background-color: #161824;
  border-color: rgba(255, 255, 255, 0.08);
}

.dark-theme a {
  color: #71b7ff;
}