.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  padding: 3rem 0;
}

header h1 {
  font-size: 2.2rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

header p {
  font-size: 1.1rem;
  color: var(--text-sub);
}

.calculator-card {
  padding: 2.5rem;
  margin-bottom: 2rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.8rem;
  font-weight: 700;
  color: var(--text-main);
}

input[type="date"] {
  width: 100%;
  padding: 1rem;
  border: 1px solid #ddd;
  border-radius: 12px;
  font-family: inherit;
  font-size: 1rem;
  background: var(--bg-color);
  color: var(--text-main);
}

body.dark-mode input[type="date"] { border-color: #444; }

button {
  padding: 1rem 2rem;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover { background: #3d968f; }

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.dday-card, .age-card { text-align: center; padding: 2rem; }
.label { display: block; font-size: 0.9rem; color: var(--text-sub); margin-bottom: 0.5rem; }
.value { display: block; font-size: 2rem; font-weight: 700; color: var(--primary-color); }

.milestone-card h3 {
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 0.8rem;
    color: var(--text-main);
}

body.dark-mode .milestone-card h3 { border-color: #333; }

#anniversary-list { list-style: none; }
#anniversary-list li {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid #f9f9f9;
    color: var(--text-main);
}

body.dark-mode #anniversary-list li { border-color: #222; }
#anniversary-list li:last-child { border-bottom: none; }

.anni-name { font-weight: 500; }
.anni-date { color: var(--text-sub); font-size: 0.9rem; }
.anni-dday { font-weight: 700; color: #e57373; }

.home-link {
    display: block;
    text-align: center;
    margin-top: 2rem;
    color: var(--text-sub);
    text-decoration: none;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    .result-grid { grid-template-columns: 1fr; }
}