:root {
    --primary-color: #808000;
    --secondary-color: #6b8e23;
    --background-color: #fcfcf0;
    --font-color: #333;
    --border-color: #ddd;
    --hover-color: #556b2f;
    --shadow-color: rgba(80, 80, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--font-color);
    display: flex;
    justify-content: center;
    align-items: flex-start; /* 모바일에서 위쪽부터 시작하도록 변경 */
    min-height: 100vh;
    margin: 0;
    padding: 20px 0; /* 상하 여백 추가 */
    background-image: url('data:image/svg+xml,%3Csvg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"%3E%3Cg fill="none" fill-rule="evenodd"%3E%3Cg fill="%23808000" fill-opacity="0.04"%3E%3Cpath d="M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z"/%3E%3C/g%3E%3C/g%3E%3C/svg%3E');
}

#app-container {
    width: 95%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

calendar-app, study-list {
    display: block;
    width: 100%;
    background-color: #fff;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    overflow: hidden;
}

/* 모바일 전용 스타일 */
@media (max-width: 600px) {
    body {
        padding: 10px 0;
    }
    .auth-card {
        padding: 20px;
        width: 90%;
    }
    nav {
        width: 100%;
        padding: 10px 15px !important;
        font-size: 0.9rem;
    }
}

#auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100vh;
}

.auth-card {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-card h2 {
    color: var(--primary-color);
    margin-bottom: 30px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.auth-form input {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.auth-buttons {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.auth-buttons button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s;
}

#login-btn {
    background: var(--primary-color);
    color: white;
}

#login-btn:hover {
    background: var(--hover-color);
}

#signup-btn.secondary {
    background: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

#signup-btn.secondary:hover {
    background: #f0f4f0;
}