/* ── CSS Variables ── */
:root {
  --color-primary: #205EA6;
  --color-secondary: #8B7EC8;
  --color-accent: #A02F6F;
  --color-dark: #282726;
  --color-light: #F2F0E5;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.15);
  --radius: 8px;
}

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

body {
  font-family: system-ui, sans-serif;
  background-color: var(--color-light);
  color: var(--color-dark);
  min-height: 100vh;
  padding: 2rem;
}

h1, h2 {
  text-align: center;
  margin-bottom: 1.5rem;
}

.section {
  max-width: 800px;
  margin: 0 auto 3rem;
  padding: 2rem;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

/* ── Tombol Hover ── */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  color: white;
}

.btn-color {
  background-color: var(--color-primary);
  transition: background-color 0.2s ease;
}

.btn-color:hover {
  background-color: var(--color-dark);
}

.btn-transform {
  background-color: var(--color-secondary);
  transition: transform 0.4s ease;
}

.btn-transform:hover {
  transform: scale(1.1) rotate(-3deg);
}

.btn-shadow {
  background-color: var(--color-accent);
  transition: box-shadow 0.4s ease, transform 0.2s ease;
}

.btn-shadow:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

/* ── Loading Spinner ── */
.spinner {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  border: 4px solid var(--color-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ── Fade In ── */
.fade-in-element {
  padding: 1.5rem;
  background-color: var(--color-primary);
  color: white;
  border-radius: var(--radius);
  text-align: center;
  opacity: 0;
  animation: fadeIn 1.5s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}