:root {
  --background: 224 28% 10%;
  --foreground: 210 20% 96%;
  --primary: 266 84% 64%;
  --secondary: 192 80% 56%;
  --muted: 222 18% 18%;
  --destructive: 0 78% 58%;
  --border: 223 18% 22%;
  --card: 224 24% 13%;

  --shadow-sm: 0 8px 24px hsla(240, 30%, 4%, 0.16);
  --shadow-md: 0 16px 40px hsla(240, 30%, 4%, 0.24);
  --shadow-lg: 0 24px 60px hsla(240, 30%, 4%, 0.32);

  --transition-fast: 160ms ease;
  --transition-smooth: 280ms cubic-bezier(0.22, 1, 0.36, 1);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

.dark {
  --background: 224 28% 10%;
  --foreground: 210 20% 96%;
  --primary: 266 84% 64%;
  --secondary: 192 80% 56%;
  --muted: 222 18% 18%;
  --destructive: 0 78% 58%;
  --border: 223 18% 22%;
  --card: 224 24% 13%;
}

* {
  box-sizing: border-box;
}

html, body, #root {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, hsla(266, 84%, 64%, 0.12), transparent 30%),
    radial-gradient(circle at bottom right, hsla(192, 80%, 56%, 0.10), transparent 28%),
    hsl(var(--background));
  color: hsl(var(--foreground));
}

img,
video {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

::selection {
  background: hsla(266, 84%, 64%, 0.35);
  color: hsl(var(--foreground));
}

.app-shell {
  min-height: 100vh;
}

.card-surface {
  background: linear-gradient(180deg, hsla(0, 0%, 100%, 0.02), hsla(0, 0%, 100%, 0.01));
  background-color: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.soft-ring {
  box-shadow: 0 0 0 1px hsl(var(--border));
}

.glow {
  box-shadow: 0 0 0 1px hsla(266, 84%, 64%, 0.18), 0 16px 40px hsla(266, 84%, 64%, 0.16);
}

.input-base {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid hsl(var(--border));
  background: hsla(0, 0%, 100%, 0.02);
  color: hsl(var(--foreground));
  padding: 0.9rem 1rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.input-base:focus {
  border-color: hsl(var(--primary));
  box-shadow: 0 0 0 4px hsla(266, 84%, 64%, 0.15);
}

.btn-primary,
.btn-secondary,
.btn-ghost,
.btn-danger {
  border: none;
  transition: transform var(--transition-fast), opacity var(--transition-fast), background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover,
.btn-secondary:hover,
.btn-ghost:hover,
.btn-danger:hover {
  transform: translateY(-1px);
}

.btn-primary:active,
.btn-secondary:active,
.btn-ghost:active,
.btn-danger:active {
  transform: translateY(0);
}

.feed-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 768px) {
  .feed-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }
}

.fade-in {
  animation: fadeIn 280ms ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}